CN114966293A

CN114966293A - Integrated multifunctional transformer testing equipment capable of achieving flexible tangent control

Info

Publication number: CN114966293A
Application number: CN202210724708.6A
Authority: CN
Inventors: 路驹; 张越峰; 赵占强
Original assignee: SHAANXI YILIAN ELECTRICAL EQUIPMENT CO Ltd
Current assignee: SHAANXI YILIAN ELECTRICAL EQUIPMENT CO Ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2022-08-30

Abstract

The invention discloses integrated multifunctional transformer testing equipment capable of realizing flexible tangent control, and relates to the technical field of power detection. The integrated multifunctional transformer testing equipment comprises a wiring switching device and a multifunctional transformer parameter testing device, wherein the wiring switching device is connected with a tested transformer and the multifunctional transformer parameter testing device, and the wiring switching device controls a high-power relay or an intermediate relay to be in a suction or disconnection state according to different combinational logics and switches to a testing channel correspondingly required by the multifunctional transformer parameter testing device. The multifunctional transformer parameter testing device can switch and output the testing wiring paths of different transformer testing items, does not need to climb the transformer for many times to test the disconnection and the wire change of a connecting wire, simultaneously integrates multiple conventional testing functions into one system, is convenient to use on site, and can finish the high-efficiency detection of the transformer power failure testing item without carrying multiple instruments of different testing items.

Description

Integrated multifunctional transformer testing equipment capable of achieving flexible tangent control

Technical Field

The invention relates to the technical field of power detection, in particular to integrated multifunctional transformer testing equipment capable of achieving flexible tangent control.

Background

At present, electrical equipment, especially instrument equipment for overhauling and testing a power transformer, is classified into various types according to the testing function. Each test instrument has a set of dedicated test connecting wires, and when testing different functions of the transformer, the corresponding test connecting wires need to be replaced. The test wiring mode and the number of test lines of each test device are different, the number of the test lines is 3 to 4 in a small number, and the number of the test lines is 10 in a large number. In addition, most transformer tests are performed on windings, and the height of the winding terminal of the main power transformer is more than 5 meters or even higher from the ground. During testing, the test equipment is generally placed on the ground beside the transformer to be tested, and the test connection wires need to be connected from the equipment to the winding terminals for testing. Therefore, the corresponding test instruments are equipped with test connection wires of a length exceeding 5 meters. When a plurality of different project tests are carried out on a transformer, a worker is required to climb onto the transformer for many times to test the connecting wire and replace the connecting wire. Thus, it takes a lot of time to connect, remove and replace the test connection lines. Therefore, most of the time of the parameter test work of the transformer is used for connecting and dismantling the test connecting line, the test efficiency is lower, and workers climb the transformer for many times to increase the probability of high-altitude falling accidents.

In addition, in order to ensure the safe operation of the basic equipment of the power supply system, the electric power operation maintenance unit can carry out regular or irregular overhaul tests on important equipment such as a power transformer and the like according to actual conditions, so that faults or hidden dangers can be found and eliminated. The electrical overhaul test is to find the hidden trouble of the equipment in operation, prevent accidents or equipment damage, and inspect, test or monitor the equipment, is an important link in the operation and maintenance work of the electrical equipment, and is one of effective means for ensuring the safe operation of the electrical equipment.

At present, the apparatus used for overhauling the transformer and the switch mainly comprises a transformer direct resistance tester, a transformation ratio tester, an insulation resistance tester, a switch characteristic tester, a loop resistance tester, an action coil resistance tester and the like. The weight of each device and the test lead is about 10 kg, and the total weight is about 60-80 kg. Each time of overhaul test needs to carry various test equipment such as special test equipment of the test project, each kind of equipment only has a test function, each set of equipment all comprises a mainframe box and an accessory box, a plurality of test equipment need to be carried to the scene during each time of detection test, and in addition to other auxiliary appliances, the quantity of equipment that needs to be carried in each time of test work is a lot. Most of the current test equipment is operated by a key, and some operation processes are complicated. In addition, the display screen of the existing equipment is small in size, and results are not easy to view. Moreover, each kind of equipment adopts a special test line, the sharing performance is poor, the test line needs to be reconnected when the test items are replaced each time, the workload of field operators is large, and the equipment is easy to be burnt out even due to wrong connection of the test data.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides the integrated multifunctional transformer testing equipment capable of realizing flexible tangent control.

The technical scheme adopted by the invention for realizing the technical effects is as follows:

the utility model provides a can be nimble tangent line control's multi-functional transformer test equipment of integrated form, includes wiring auto-change over device and multi-functional transformer parameter test device, wiring auto-change over device connect the transformer under test with multi-functional transformer parameter test device, wiring auto-change over device is equipped with a plurality of optional open test circuit that leads to, through the actuation or the off-state that changes the relay module, switches into the corresponding required test access of multi-functional transformer parameter test device.

Preferably, in the integrated multifunctional transformer testing apparatus described above, the wiring switching device includes:

the relay combination is used for connecting the tested transformer and external test equipment to form a plurality of normally open test circuits which can be switched on;

the multi-path relay control module is connected with the relay combination and is used for controlling the relay combination to carry out different logic combination attracting and disconnecting so as to form different testing passages;

the control display module is connected with the multi-path relay control module and used for inputting a gating instruction in a touch manner and displaying test data;

the power supply module is connected with the multi-path relay control module and the control display module;

and the working power supply is connected with the action coil of the relay combination and the power supply module.

Preferably, in the above-mentioned integrated multifunctional transformer test equipment, the wiring switching device further includes a wiring terminal strip connected to the relay combination, the wiring terminal strip includes a transformer wiring terminal and a test device wiring terminal, the transformer wiring terminal is connected to the winding of the tested transformer, and the test device wiring terminal is connected to the multifunctional transformer parameter test device.

Preferably, in the above integrated multifunctional transformer testing apparatus, the relay combination includes a plurality of high-power relays and intermediate relays connected in series or in parallel according to a control logic, the transformer terminal is connected to a normally-closed point of the high-power relay and an input point of the intermediate relay, and the testing device terminal is connected to a common terminal of the high-power relay and an output terminal of the intermediate relay.

Preferably, in the above integrated multifunctional transformer testing device, the transformer terminal comprises a current terminal and a voltage terminal, the current terminal comprises a high-voltage current terminal connected with the transformer high-voltage side detection and a low-voltage current terminal connected with the transformer low-voltage side detection, and the voltage terminal comprises a high-voltage terminal connected with the transformer high-voltage side detection and a low-voltage terminal connected with the transformer low-voltage side detection.

Preferably, in the above integrated multifunctional transformer testing apparatus, the testing device connection terminal includes a current detection terminal and a voltage detection terminal.

Preferably, in the above integrated multifunctional transformer testing device, the wiring switching device further includes a power switch connected to the working power supply, and an operation button and a communication port connected to the multi-relay control module.

Preferably, in the above-mentioned integrated multifunctional transformer testing apparatus, the multifunctional transformer parameter testing device includes a core control platform, a power module, a relay switching module, a terminal module, a communication interface module integrated in an apparatus cabinet, and a dc resistance measuring module, an insulation resistance measuring module, a transformation ratio measuring module, a load switch testing module, a dielectric loss measuring module, a short-circuit impedance measuring module, and a winding deformation testing module for detecting different testing data of the transformer, where the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module are respectively connected to the power module through the relay switching module, and the tested transformer is respectively connected to the dc resistance measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module through the terminal module, The insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module are connected, the core control platform is connected with the direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module through the communication interface module, and the core control platform is connected with the relay switching module through the communication interface module.

Preferably, in the above integrated multifunctional transformer testing apparatus, the relay switching module includes seven relays, and the relays are connected to the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module in a one-to-one correspondence manner, an output end of the power supply module is connected to a common end of a moving point of the relay switching module by using a power line, and a normally open point of each relay is correspondingly connected to power supply ends of the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module.

Preferably, in foretell multi-functional transformer test equipment of integrated form, the wiring end module includes the wiring panel and fixes a plurality of binding post on the wiring panel, direct current resistance measuring module, insulation resistance measuring module, transformation ratio measuring module, on-load switch test module, dielectric loss measuring module, short-circuit impedance measuring module, winding deformation test module's input are connected to corresponding binding post respectively, connect corresponding binding post and the transformer that is surveyed through the test wire, the switch-on corresponds detection circuitry.

The invention has the beneficial effects that: the invention can switch and output the test wiring channels of different transformer test items through the wiring switching device, and solves the problems that the transformer needs to be climbed for many times to test the disconnection and the wire change of the connecting wire when different test items are carried out on the power transformer in the prior art. The number of times that the staff scrambleed the transformer can be reduced, operating time is reduced, work efficiency is improved, and the probability of safety accident is reduced. In addition, multi-functional transformer parameter testing arrangement is through being integrated as an organic whole with multiple different function test module for multinomial conventional test function melts to a system, and on-the-spot convenient to use need not carry many different test project's instrument, just can accomplish the high-efficient detection of transformer power failure test project, has overcome a great deal of inconveniences that use conventional instrument and equipment experiment to bring, and the wiring is convenient, has reduced test wiring work load, has alleviateed equipment weight. Through the test access switching of the wiring switching device, the multifunctional transformer parameter testing device does not need to be changed, the operation is simple, the influence on the testing precision of the multifunctional transformer parameter testing device is small, and the accuracy of the multifunctional transformer parameter testing device can be ensured.

Drawings

FIG. 1 is a block diagram of the functional modules of the test apparatus of the present invention;

FIG. 2 is a schematic diagram of a switching test path of the connection switching apparatus according to the present invention;

FIG. 3 is a schematic diagram of a switching test path of the connection switching apparatus according to the present invention;

FIG. 4 is a circuit diagram of a relay operation control circuit according to the present invention;

FIG. 5(a) is a circuit diagram of a current and voltage test path formed between the A phase and the B phase of the high-voltage side winding of the transformer;

FIG. 5(b) is a circuit diagram of a current and voltage test path formed between the phase a and the phase b of the low-voltage side winding of the transformer;

FIG. 5(C) is a circuit diagram of a current and voltage test path formed between the A phase and the C phase of the high-voltage side winding of the transformer;

FIG. 5(d) is a circuit diagram of a current and voltage test path formed between the a phase and the c phase of the low-voltage side winding of the transformer;

FIG. 5(e) is a circuit diagram of a current and voltage test path formed between the B phase and the C phase of the high-voltage side winding of the transformer;

FIG. 5(f) is a circuit diagram of a current and voltage test path formed between the phase b and the phase c of the low-voltage side winding of the transformer;

FIG. 5(g) is a circuit diagram of a transformer high/low voltage winding phase terminals forming a transformation ratio group test path;

fig. 5(h) is a circuit diagram of a low-voltage impedance and on-load switch test path formed between phase terminals of a high-voltage winding of a transformer;

fig. 6(a) is a perspective view of the wire switching device of the present invention;

fig. 6(b) is a schematic view of terminal block a of the present invention;

fig. 6(c) is a schematic view of a terminal block B of the present invention;

fig. 6(d) is a schematic view of a terminal block C of the present invention;

fig. 6(e) is a schematic view of a terminal block D of the present invention;

FIG. 7 is a block diagram of a functional module of the multifunctional transformer parameter testing device according to the present invention;

FIG. 8 is a block diagram of a DC resistance measurement module according to the present invention;

FIG. 9 is a block diagram of a circuit of an insulation resistance measuring module according to the present invention;

FIG. 10 is a block diagram of the circuit of the ratio measurement module of the present invention;

fig. 11 is a circuit block diagram of the dielectric loss measuring module according to the present invention.

Fig. 12 is a schematic diagram of an application of the integrated multifunctional transformer testing apparatus according to the present invention.

Wherein, the corresponding relation of the reference numbers is as follows:

1. the wiring terminals (IA), 2, wiring terminals (UA), 3, wiring terminals (Ia), 4, wiring terminals (Ua), 5, wiring terminals (IB), 6, wiring terminals (UB), 7, wiring terminals (Ib), 8, wiring terminals (Ub), 9, wiring terminals (IC), 10, wiring terminals (UC), 11, wiring terminals (IC), 12, wiring terminals (Uc), 13, wiring terminals (IO), 14, wiring terminals (UO), 15, wiring terminals (Io), 16 and wiring terminals (UO);

17. the wiring terminal comprises wiring terminals (A/IA/I +),18, wiring terminals (a/UA/I-),19, wiring terminals (B/IB/U +),20, wiring terminals (B/UB/U-),21, wiring terminals (C/IC),22, wiring terminals (C/UC),23, wiring terminals (O/IO),24 and wiring terminals (O/UO);

25. a multi-path relay control module;

31. a first high-power relay module, 32, a second high-power relay module, 33, a third high-power relay module, 34, a fourth high-power relay module, 35, a fifth high-power relay module, 36, a sixth high-power relay module, 37, a seventh high-power relay module, 38 and an eighth high-power relay module;

39. a first intermediate relay module, 40, a second intermediate relay module;

41. the terminal block A, 42, B, 43, C, 44 and D; 45. the device comprises a power switch 46, a control display module 47, an operation key 48, a communication port 50, a shell 51, a multifunctional transformer parameter testing device 52, a wiring switching device 53 and a tested transformer 53.

Detailed Description

For a further understanding of the present invention, reference will now be made to the following examples and drawings.

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, manual control is also intended to include automatic control unless the context clearly indicates otherwise. Furthermore, it will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof. In the present invention, terms such as "connected" are to be understood in a broad sense and are intended to be physically and electrically conductive and are not limited to a specific connection manner. In the present invention, terms such as "connecting wire" should be understood in a broad sense, and refer to metal wires, electric wires, etc. in the related art, which meet the corresponding electrical application rules. In the description of the drawings, the code symbols used in the names of the components are for convenience of explanation and are not to be construed as limitations on the practice of the invention. It should be noted that, in the present invention, terms such as "connection terminal" and "terminal" should be understood in a broad sense, and refer to signal input or output points in the related art that meet the corresponding electrical application rules, and the specific embodiments are not limited to the description and the drawings, and the use of different types or appearances or the use of different connection modes also belongs to the protection scope of the present invention. In the present invention, terms such as: "control" is to be understood broadly and means enabling, and is not limited to the manner in which the present invention is described. In the present invention, terms such as: the term "relay" is to be understood as a description of a principle and a function, and is not limited to a certain type of relay, but may be a contactor, various types of switches with control functions, a relay, and other devices with similar functions. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.

As shown in fig. 1, an embodiment of the present invention provides an integrated multifunctional transformer testing apparatus capable of flexible tangential control, which includes a wiring switching device and a multifunctional transformer parameter testing device, wherein the wiring switching device connects a tested transformer and the multifunctional transformer parameter testing device. Specifically, the wiring switching device is provided with a plurality of normally open test circuits which can be selected to be connected, and the normally open test circuits are switched into corresponding required test paths of the multifunctional transformer parameter test device by changing the suction or disconnection state of a relay module in the wiring switching device. The multifunctional transformer parameter testing device integrates testing modules with different functions, and can be flexibly switched and connected to corresponding required testing passages through the wiring switching device, namely the testing modules which need to be used in the current test, so that the wiring efficiency is improved, the centralized test of different testing functions of the transformer based on the same testing device is realized, and the equipment integration level is improved.

Further, in a preferred embodiment of the present invention, as shown in fig. 1, the wire switching device includes:

and the working power supply is connected with the action coil combined with the relay and the power supply module.

This wiring auto-change over device switches through the test wiring route to the difference, can carry out different transformer test items, need not change multi-functional transformer parameter testing arrangement, easy operation to it is little to multi-functional transformer parameter testing arrangement's measuring accuracy influence, can guarantee multi-functional transformer parameter testing arrangement's test accuracy. The problem of among the prior art when testing power transformer, need use different test connection circuit and climb the transformer many times and take out stitches, trade the line, connect the test line again according to different test items is solved. The number of times that electric power staff scrambleed the transformer can be reduced, test operating time is reduced, test operating efficiency is improved, the incident probability is reduced.

Further, in a preferred embodiment of the present invention, the multifunctional transformer parameter testing device further comprises a terminal block connected to the relay combination, the terminal block comprises a transformer terminal and a testing device terminal, wherein the transformer terminal is connected to the tested transformer winding, and the testing device terminal is connected to the multifunctional transformer parameter testing device. Through the binding post row that the set has transformer binding post and the binding post row that the set has testing arrangement binding post, can swiftly conveniently realize the switching of wiring, need not to scramble the transformer many times when changing the test item, the adjustment of test line is convenient and fast more.

Further, in a preferred embodiment of the present invention, the relay assembly includes a plurality of high power relay modules and intermediate relay modules sequentially connected in series or in parallel according to the control logic. The transformer wiring terminal is respectively connected with a normally closed point of the high-power relay module and an input point of the intermediate relay module, and the testing device wiring terminal is respectively connected with a public end of the high-power relay module and an output end of the intermediate relay module.

Further, in a preferred embodiment of the present invention, the transformer terminal comprises a current terminal and a voltage terminal, wherein the current terminal comprises a high voltage current terminal connected to the transformer high voltage side detection and a low voltage current terminal connected to the transformer low voltage side detection; the voltage terminals include a high voltage terminal for connection to a high side test of the transformer and a low voltage terminal for connection to a low side test of the transformer. The testing device wiring terminal comprises a current detection terminal and a voltage detection terminal. In order to facilitate operation and control, the wiring switching device also comprises a power switch connected with a working power supply, an operation key connected with the multi-path relay control module and a communication port.

Specifically, as shown in fig. 2, 3 and 4, the relay combination includes eight high power relay modules and two intermediate relay modules, wherein the eight high power relays are respectively a first high power relay module 31, a second high power relay module 32, a third high power relay module 33, a fourth high power relay module 34, a fifth high power relay module 35, a sixth high power relay module 36, a seventh high power relay module 37 and an eighth high power relay module 38; the two intermediate relay modules are a first intermediate relay module 39 and a second intermediate relay module 40, respectively. Specifically, referring to fig. 2, the first high power relay module 31 includes a high power relay K1 and a first switching circuit, the second high power relay module 32 includes a high power relay K2 and a second switching circuit, the third high power relay module 33 includes a high power relay K3 and a third switching circuit, the fourth high power relay module 34 includes a high power relay K4 and a fourth switching circuit, the fifth high power relay module 35 includes a high power relay K5 and a fifth switching circuit, the sixth high power relay module 36 includes a high power relay K6 and a sixth switching circuit, the seventh high power relay module 37 includes a high power relay K7 and a seventh switching circuit, and the eighth high power relay module 38 includes a high power relay K8 and an eighth switching circuit. Referring to fig. 3, the first intermediate relay module 39 includes an intermediate relay KA1 and a first intermediate switch circuit, and the second intermediate relay module 40 includes an intermediate relay KA2 and a second intermediate switch circuit.

As shown in FIGS. 2 and 3, the terminals include a terminal (IA)1, a terminal (UA)2, a terminal (Ia)3, a terminal (Ua)4, a terminal (IB)5, a terminal (UB)6, a terminal (Ib)7, a terminal (Ub)8, a terminal (IC)9, a terminal (UC)10, a terminal (IC)11, a terminal (Uc)12, a terminal (IO)13, a terminal (UO)14, a terminal (Io)15, a terminal (UO)16, a terminal (A/IA/I +)17, a terminal (a/UA/I-)18, a terminal (B/IB/U +)19, a terminal (B/UB/U-)20, a terminal (C/IC)21, a terminal (C/UC)22, a terminal (U-) 18, and a terminal (B) including a terminal (B) and a terminal (U-) 3, and a terminal (B) including a terminal (B) and a) including a terminal (B) and a terminal (B) including a terminal (B) and a terminal (B) including a terminal (B) and a) including a terminal (B) 12, a terminal (B) and a terminal (B) 12, a terminal (B) including a terminal (B) 12, a terminal (B) 12, a terminal (B, A connection terminal (O/IO)23 and a connection terminal (O/Uo) 24. The transformer testing device comprises a connecting terminal (IA), a connecting terminal (UA) 1, a connecting terminal (Ia)3, a connecting terminal (Ua)4, a connecting terminal (IB)5, a connecting terminal (UB)6, a connecting terminal (Ib)7, a connecting terminal (Ub)8, a connecting terminal (IC)9, a connecting terminal (UC)10, a connecting terminal (IC)11, a connecting terminal (Uc)12, a connecting terminal (IO)13, a connecting terminal (UO)14, a connecting terminal (Io)15 and a connecting terminal (UO)16, wherein sixteen connecting terminals are transformer connecting terminals and are connected with corresponding windings of a tested transformer through corresponding winding connections of the tested transformer; the eight terminals of the terminal (A/IA/I +)17, the terminal (a/UA/I-)18, the terminal (B/IB/U +)19, the terminal (B/UB/U-)20, the terminal (C/IC)21, the terminal (C/UC)22, the terminal (O/IO)23 and the terminal (O/UO)24 are testing device terminals, and are connected with corresponding testing terminals of the multifunctional transformer parameter testing device through corresponding multifunctional transformer parameter testing device terminals to form corresponding testing passages for testing different items. Specifically, the distinction between the high-voltage current terminal, the low-voltage current terminal, the high-voltage terminal, the low-voltage terminal, the current detection terminal and the voltage detection terminal is determined according to the symbols of the respective connection terminals in the description of the drawings and in fig. 2 and 3, for example, the connection terminal (IA)1 is the high-voltage current terminal, I in parentheses represents the current terminal, and a represents the a phase of the high-voltage side winding of the transformer; if the wiring terminal (Ia)3 is a low-voltage current terminal, I in brackets represents the current terminal, and a represents a phase a of the low-voltage side winding of the transformer; if the wiring terminal (UA)2 is a high-voltage terminal, U in brackets represents the voltage terminal, and A represents a phase A of a high-voltage side winding of the transformer; if the wiring terminal (Ua)4 is a low-voltage terminal, U in brackets represents the voltage terminal, and a represents a phase a of a low-voltage side winding of the transformer; if the connecting terminal (A/IA/I +)17 and the connecting terminal (C/IC)21 are current detection terminals, I/I + in brackets represents a current terminal, and A/C represents the A/C phase of the high-voltage side winding of the transformer; if the connection terminal (C/UC)22 is a voltage detection terminal, U in brackets represents the voltage terminal, and C/C represents the C/C phase of the low/high voltage side winding of the transformer; for example, the connection terminal (a/UA/I-)18 and the connection terminal (B/IB/U +)19 can be used as a voltage detection terminal and a current detection terminal.

As shown in fig. 2, the connection terminal (IA)1 is an external connection terminal of a phase of a high-voltage side winding a of the tested transformer, the connection terminal (IA)1 is connected to a1 st normally closed contact of a seventh switch circuit of the seventh high-power relay module 37, a1 st common terminal of the seventh switch circuit of the seventh high-power relay module 37 is connected to a1 st normally open contact of a first switch circuit of the first high-power relay module 31, the 1 st normally closed contact of the first switch circuit of the first high-power relay module 31 is suspended, a common terminal thereof is connected to the connection terminal (a/IA/I +)17, and the connection terminal (a/IA/I +)17 is a connection terminal of a test line of the multifunctional transformer parameter testing device.

The wiring terminal (UA)2 is a phase-inside connection end of a high-voltage side winding a of the tested transformer, the wiring terminal (UA)2 is connected to a1 st normally closed contact of an eighth switch circuit of the eighth large power relay module 38, a1 st common end of the eighth switch circuit of the eighth large power relay module 38 is connected to a2 nd normally open contact of a first switch circuit of the first large power relay module 31, a2 nd normally closed contact of the first switch circuit of the first large power relay module 31 is suspended, a common end of the first switch circuit is connected to the wiring terminal (B/IB/U +)19, and the wiring terminal (B/IB/U +)19 is a connection end of a test line of external test equipment.

The connection terminal (IB)5 is a B-phase outside connection terminal of a high-voltage side winding of the tested transformer, the connection terminal (IB)5 is connected to a2 nd normally closed contact of a seventh switch circuit of the seventh high-power relay module 37, a2 nd common terminal of the seventh switch circuit of the seventh high-power relay module 37 is connected to a1 st normally open contact of a third switch circuit of the third high-power relay module 33, the 1 st normally closed contact of the third switch circuit of the third high-power relay module 33 is suspended, a common terminal thereof is connected to the connection terminal (a/UA/I-)18, and the connection terminal (a/UA/I-)18 is a connection terminal of a test line of an external test device.

The wiring terminal (UB)6 is a B-phase inner side connecting end of a high-voltage side winding of a tested transformer, the wiring terminal (UB)6 is connected to a2 nd path normally closed contact of an eighth switching circuit of the eighth high-power relay module 38, a2 nd path common end of the eighth switching circuit of the eighth high-power relay module 38 is connected to a2 nd path normally open contact of a third switching circuit of the third high-power relay module 33, the 2 nd path normally closed contact of the third switching circuit of the third high-power relay module 33 is suspended, a common end of the wiring terminal (B/UB/U-)20 is connected to the wiring terminal (B/UB/U-)20, and the wiring terminal (B/UB/U-)20 is a testing line connecting end of external testing equipment.

As shown in fig. 5(a), the multi-relay control module 25 controls the first high-power relay module 31 and the third high-power relay module 33 to be simultaneously switched on, and other relay modules are all switched off. At this time, the connection terminal (IA)1 and the connection terminal (A/IA/I +)17 form a path, the connection terminal (IB)5 and the connection terminal (a/UA/I-)18 form a path, the connection terminal (UA)2 and the connection terminal (B/IB/U +)19 form a path, the connection terminal (UB)6 and the connection terminal (B/UB/U-)20 form a path, and the remaining transformer connection terminals and the remaining test apparatus connection terminals are in an open circuit state. The 4 paths are connected with the phase A and the phase B of the high-voltage side winding of the tested transformer to form a current and voltage testing path between the phase AB.

As shown in fig. 2, the connection terminal (IC)9 is an external connection terminal of the C-phase of the high-voltage side winding of the transformer to be tested, the connection terminal (IC)9 is connected to a 3 rd normally closed contact of a seventh switching circuit of the seventh high-power relay module 37, a 3 rd common terminal of the seventh switching circuit of the seventh high-power relay module 37 is connected to a1 st normally open contact of a fourth switching circuit of the fourth high-power relay module 34, the 1 st normally closed contact of the fourth switching circuit of the fourth high-power relay module 34 is suspended, a common terminal thereof is connected to the connection terminal (a/UA/I-)18, and the connection terminal (a/UA/I-)18 is a connection terminal of a test line of an external test device.

The connection terminal (UC)10 is a C-phase inner side connection terminal of a high voltage side winding of a tested transformer, the connection terminal (UC)10 is connected to a 3 rd normally closed contact of an eighth switch circuit of the eighth large power relay module 38, a 3 rd common terminal of the eighth switch circuit of the eighth large power relay module 38 is connected to a2 nd normally open contact of a fourth switch circuit of the fourth large power relay module 34, a2 nd normally closed contact of the fourth switch circuit of the fourth large power relay module 34 is suspended, the 2 nd common terminal is connected to the connection terminal (b/UB/U-)20, and the connection terminal (b/UB/U-)20 is a connection terminal of a test line of an external test device.

As shown in fig. 5(c), the multi-relay control module 25 controls the first high-power relay module 31 and the fourth high-power relay module 34 to be switched on simultaneously, and the other relay modules are all switched off. At this time, the connection terminal (IA)1 and the connection terminal (A/IA/I +)17 form a path, the connection terminal (UA)2 and the connection terminal (B/IB/U +)19 form a path, the connection terminal (IC)9 and the connection terminal (a/UA/I-)18 form a path, the connection terminal (UC)10 and the connection terminal (B/UB/U-)20 form a path, and the remaining connection terminals of the transformer and the remaining connection terminals of the testing apparatus are in an open circuit state. The 4 paths are connected with the phase A and the phase C of the high-voltage side winding of the tested transformer to form a current and voltage testing path between the AC phases.

As shown in fig. 2, the connection terminal (IB)5 is connected to the 2 nd normally closed contact of the seventh switch circuit of the seventh high power relay module 37, the 2 nd common terminal of the seventh switch circuit of the seventh high power relay module 37 is connected to the 1 st normally open contact of the second switch circuit of the second high power relay module 32, the 1 st normally closed contact of the second switch circuit of the second high power relay module 32 is floating, and the common terminal thereof is connected to the connection terminal (a/IA/I +) 17.

The connection terminal (UB)6 is connected to the 2 nd normally closed contact of the eighth switching circuit of the eighth high power relay module 38, the 2 nd common terminal of the eighth switching circuit of the eighth high power relay module 38 is connected to the 2 nd normally open contact of the second switching circuit of the second high power relay module 32, the 2 nd normally closed contact of the second switching circuit of the second high power relay module 32 is suspended, and the common terminal thereof is connected to the connection terminal (B/IB/U19 +).

As shown in fig. 5(e), the multi-relay control module 25 controls the second high-power relay module 32 and the fourth high-power relay module 34 to be switched on simultaneously, and the other relay modules are switched off completely. At this time, the connection terminal (IB)5 and the connection terminal (A/IA/I +)17 form a path, the connection terminal (UB)6 and the connection terminal (B/IB/U +)19 form a path, the connection terminal (IC)9 and the connection terminal (a/UA/I-)18 form a path, the connection terminal (UC)10 and the connection terminal (B/UB/U-)20 form a path, and the remaining transformer connection terminals and the remaining test apparatus connection terminals are in an open circuit state. The 4 paths are connected with the phase B and the phase C of the high-voltage side winding of the tested transformer to form a current and voltage testing path between the phase BC.

As shown in fig. 2, the connection terminal (Ia)3 is the phase-outside connection terminal of the low-voltage side winding a of the transformer to be tested, the connection terminal (Ia)3 is connected to the 1 st normally-open contact of the seventh switch circuit of the seventh high-power relay module 37, the connection terminal (Ua)4 is the phase-inside connection terminal of the low-voltage side winding a of the transformer to be tested, and the connection terminal (Ua)4 is connected to the 1 st normally-open contact of the eighth switch circuit of the eighth high-power relay module 38.

The connection terminal (Ib)7 is a phase-b outer connection end of the low-voltage side winding of the tested transformer, the connection terminal (Ib)7 is connected to a phase-2 normally-open contact of a seventh switch circuit of the seventh high-power relay module 37, the connection terminal (Ub)8 is a phase-b inner connection end of the low-voltage side winding of the tested transformer, and the connection terminal (Ub)8 is connected to a phase-2 normally-open contact of an eighth switch circuit of the eighth high-power relay module 38.

As shown in fig. 5(b), the multi-relay control module 25 controls the first high-power relay module 31, the third high-power relay module 33, the seventh high-power relay module 37 and the eighth high-power relay module 38 to be switched on simultaneously, and other relays are all switched off. At this time, the connection terminal (Ia)3 and the connection terminal (A/IA/I +)17 form a path, the connection terminal (Ib)7 and the connection terminal (a/UA/I-)18 form a path, the connection terminal (Ua)4 and the connection terminal (B/IB/U +)19 form a path, the connection terminal (Ub)8 and the connection terminal (B/UB/U-)20 form a path, and the remaining connection terminals of the transformer and the remaining connection terminals of the testing device are in an open circuit state. The 4 paths are connected with the phase a and the phase b of the low-voltage side winding of the tested transformer to form a current and voltage testing path between the phases ab.

As shown in fig. 2, the connection terminal (Ic)11 is the c-phase outer connection terminal of the low-voltage side winding of the transformer to be tested, the connection terminal (Ic)11 is connected to the 3 rd normally open contact of the seventh switch circuit of the seventh high-power relay module 37, the connection terminal (Uc)12 is the c-phase inner connection terminal of the low-voltage side winding of the transformer to be tested, and the connection terminal (Uc)12 is connected to the 3 rd normally open contact of the eighth switch circuit of the eighth high-power relay module 38.

As shown in fig. 5(d), the multi-relay control module 25 controls the first high-power relay module 31, the fourth high-power relay module 34, the seventh high-power relay module 37 and the eighth high-power relay module 38 to be simultaneously switched on, and other relay modules are all switched off. At this time, the connection terminal (Ia)3 and the connection terminal (A/IA/I +)17 form a path, the connection terminal (Ua)4 and the connection terminal (B/IB/U +)19 form a path, the connection terminal (Ic)11 and the connection terminal (a/UA/I-)18 form a path, the connection terminal (Uc)12 and the connection terminal (B/UB/U-)20 form a path, and the remaining transformer connection terminals and the remaining test apparatus connection terminals are in an open circuit state. The 4 paths are connected with the phase a and the phase c of the low-voltage side winding of the tested transformer to form a current and voltage testing path between the ac phases.

As shown in fig. 5(f), the multi-relay control module 25 controls the second high-power relay module 32, the fourth high-power relay module 34, the seventh high-power relay module 37 and the eighth high-power relay module 38 to be simultaneously switched on, and other relay modules are all switched off. At this time, the connection terminal (Ib)7 and the connection terminal (A/IA/I +)17 form a path, the connection terminal (Ub)8 and the connection terminal (B/IB/U +)19 form a path, the connection terminal (Ic)11 and the connection terminal (a/UA/I-)18 form a path, the connection terminal (Uc)12 and the connection terminal (B/UB/U-)20 form a path, and the remaining connection terminals of the transformer and the remaining connection terminals of the testing device are in an open circuit state. The 4 paths are connected with the phase b and the phase c of the low-voltage side winding of the tested transformer to form a current and voltage testing path between the phase bc.

The terminal (IO)13, the terminal (UO)14, the terminal (Io)15 and the terminal (UO)16 are respectively connected to the O point and the O point (transformer neutral point) of the tested transformer, and according to the practical application condition, the high-power relay modules and the intermediate relay modules are controlled to form a passage for testing the relative O or O points of the high-voltage side winding and the low-voltage side winding of the transformer.

As shown in fig. 3, the connection terminal (IA)1, the connection terminal (UA)2, the connection terminal (IB)5, the connection terminal (UB)6, the connection terminal (IC)9, the connection terminal (UC)10, the connection terminal (IO)13 and the connection terminal (UO)14 are respectively connected to the output connection terminals of the first intermediate relay module 39 in the above-mentioned order, the input terminals of the first intermediate relay module 39 are connected in sequence to a terminal (A/IA/I +)17, a terminal (a/UA/I-)18, a terminal (B/IB/U +)19, a terminal (B/UB/U-)20, a terminal (C/IC)21, a terminal (C/UC)22, a terminal (O/IO)23 and a terminal (O/UO)24, respectively.

The connection terminal (UA)2, the connection terminal (UA)4, the connection terminal (UB)6, the connection terminal (UB)8, the connection terminal (UC)10, the connection terminal (UC)12, the connection terminal (UO)14 and the connection terminal (UO)16 are connected to the output connection terminals of the second intermediate relay module 40 in this order, the input terminals of the second intermediate relay module 40 are connected to the terminal terminals (A/IA/I +)17, the terminal terminals (a/UA/I-)18, the terminal terminals (B/IB/U +)19, the terminal terminals (B/UB/U-)20, the terminal terminals (C/IC)21, the terminal terminals (C/UC)22, the terminal terminals (O/IO)23 and the terminal terminals (O/UO)24, respectively, in this order.

As shown in fig. 5(h), the multi-relay control module 25 controls the first intermediate relay module 39 to close, and all other relay modules are open, at this time, the connection terminal (IA)1 and the connection terminal (a/IA/I +)17, the connection terminal (UA)2 and the connection terminal (a/UA/I-)18, the connection terminal (IB)5 and the connection terminal (B/IB/U +)19, the connection terminal (UB)6 and the connection terminal (B/UB/U-)20, the connection terminal (IC)9 and the connection terminal (C/IC)21, the connection terminal (UC)10 and the connection terminal (C/UC)22, the connection terminal (IO)13 and the connection terminal (O/IO)23, and the connection terminal (UO)14 and the connection terminal (O/UO)24 form a test path respectively, the remaining transformer terminals and the remaining test device terminals are open-circuited. The above-mentioned route connects every phase terminal of the high-voltage side winding of the tested transformer separately, this state can be used for carrying on the project test such as the short-circuit impedance of the transformer, on-load tap-changer.

As shown in fig. 5(g), the multi-relay control module 25 controls the second intermediate relay module 40 to be closed, and all other relay modules are opened, at this time, the connection terminal (UA)2 and the connection terminal (a/IA/I +)17, the connection terminal (UA)4 and the connection terminal (a/UA/I-)18, the connection terminal (UB)6 and the connection terminal (B/IB/U +)19, the connection terminal (UB)8 and the connection terminal (B/UB/U-)20, the connection terminal (UC)10 and the connection terminal (C/IC)21, the connection terminal (UC)12 and the connection terminal (C/UC)22, the connection terminal (UO)14 and the connection terminal (O/IO)23, and the connection terminal (UO)16 and the connection terminal (O/UO)24 form a test path respectively, the remaining transformer terminals and the remaining test device terminals are open-circuited. The above-mentioned route connects the terminal of every phase of high-voltage and low-voltage side winding of tested transformer separately, can carry on project test such as transformer transformation ratio and group.

Further, in a preferred embodiment of the present invention, as shown in fig. 6(a), it is a perspective view of the wiring switching device 52 of the present invention, which includes a housing 50, the upper surface of the housing 50 is provided with a wiring terminal row a 41, a wiring terminal row B42, a wiring terminal row C43, a wiring terminal row D44, a power switch 45, a control display module 46, an operation key 47 and a communication port 48, and a relay combination, a multi-relay control module, a power module and an operating power supply are arranged in the housing 50. As shown in fig. 6(b), which is a schematic diagram of the terminal block a, the terminal block a is provided with a terminal (IA)1, a terminal (UA)2, a terminal (IA)3, a terminal (UA)4, a terminal (a/IA/I +)17, and a terminal (a/UA/I-) 18. As shown in fig. 6(c), the schematic diagram of the terminal block B is provided with a terminal (IB)5, a terminal (UB)6, a terminal (IB)7, a terminal (UB)8, a terminal (B/IB/U +)19, and a terminal (B/UB/U-) 20. As shown in fig. 6(d), the schematic diagram of the terminal block C is provided with a terminal (IC)9, a terminal (UC)10, a terminal (IC)11, a terminal (UC)12, a terminal (C/IC)21, and a terminal (C/UC) 22. As shown in fig. 6(e), the schematic diagram of the terminal block D is provided with a terminal (IO)13, a terminal (UO)14, a terminal (IO)15, a terminal (UO)16, a terminal (O/IO)23, and a terminal (O/UO) 24.

Further, in the embodiment of the present invention, as shown in fig. 7, the multifunctional transformer parameter testing apparatus includes a core control platform, a power module, a relay switching module, a terminal module, a communication interface module, a dc resistance measuring module, an insulation resistance measuring module, a transformation ratio measuring module, a load switch testing module, a dielectric loss measuring module, a short-circuit impedance measuring module, and a winding deformation testing module, which are integrated in one equipment cabinet. The direct-current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module are respectively connected with the power supply module through the relay switching module. The tested transformer is respectively connected with the direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module through the wiring terminal module. The core control platform is respectively connected with the direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module through the communication interface module and is used for receiving the testing data output by the different function testing modules. The core control platform is connected with the relay switching module through the communication interface module, and circuit on-off control over the relay switching module can be achieved through the core control platform, so that the corresponding function testing module can be independently switched on to work. Through the inside exclusive formula power supply mode of multichannel equipment that adopts, only test function circuit work alone all the way at every moment promptly, each functional test module can realize keeping apart each other, and each other does not interfere with the flexibility, is favorable to the maintenance and the renewal of equipment.

Further, in a preferred embodiment of the present invention, the relay switching module includes seven relays, and the relays are connected to the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module in a one-to-one correspondence manner, an output end of the power supply module is connected to a common end of a moving point of the relay switching module by using a power line, and a normally open point of each relay is correspondingly connected to power supply ends of the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module. The communication interface module comprises an RS232 communication interface and a USB communication interface, and the core control platform is connected with the control end of the relay switching module through the RS232 communication interface and an RS232 communication line and used for outputting a control instruction and controlling the corresponding relay to be powered on. The relay switching module is connected to a control end of the relay switching module through an RS232 communication line, and the core control platform controls the on-off of the corresponding relay through outputting a control instruction, so that the power supply for only one functional measurement module at the same time can be controlled. The test data can be exported through the USB communication interface and the USB communication line, and the data report can output a printing format or an electronic document according to a template provided by a user, so that the comprehensive comparison and analysis of the data are facilitated.

Further, in a preferred embodiment of the present invention, the terminal module includes a terminal panel and a plurality of terminals fixed on the terminal panel, and the input ends of the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module are respectively connected to corresponding terminals, and the corresponding terminals and the tested transformer are connected by test wires to connect the corresponding detection circuits. In the invention, the power supply module is externally connected with an AC220V power supply, the core control platform is connected with a 12-inch touch display screen, and the core control platform is an industrial personal computer. The measured data can return to the core control platform through the communication interface module for data storage, and can be displayed on the 12-inch touch display screen, and meanwhile, the 12-inch touch display screen can be used for inputting operation control instructions to the core control platform.

Further, in the embodiment of the present invention, as shown in fig. 8 to 11, a circuit block diagram of the dc resistance measuring module, a circuit block diagram of the insulation resistance measuring module, a circuit block diagram of the transformation ratio measuring module, and a circuit block diagram of the dielectric loss measuring module are shown, respectively. As shown in fig. 8, the direct current resistance measurement module includes a constant current output source, a discharge protection circuit, a resistor Rx, a signal processing circuit, a high speed a/D sampler, an ARM processor, a constant current output control circuit and a communication interface, the core control platform is connected with the ARM processor through the communication interface, the constant current output control circuit is connected with the ARM processor, the constant current output control circuit is connected with the constant current output source, the constant current output source is connected with the resistor Rx through the discharge protection circuit, the resistor Rx is connected with the high speed a/D sampler through the signal processing circuit, and the signal processing circuit and the high speed a/D sampler are respectively connected with the ARM processor. The direct current resistance measurement module loads constant current to the tested transformer through a constant current source generating direct current, the current generates corresponding voltage values at two ends of the tested transformer, the voltage values at two ends of the tested transformer are sampled, and then the resistance value is calculated by using ohm's law. The direct current resistance measuring module adopts a typical four-wire system measuring method so as to improve the accuracy of resistance measurement. The direct current resistance measurement module is composed of a constant current output source, a signal processing circuit and an A/D converter to form a main body of the measurement circuit, the ARM processor applies constant and high-precision current to an external tested transformer by controlling the constant current output source, then processes sampling data (including test voltage, current test current and the like), and obtains an actual resistance value through calculation.

As shown in fig. 9, the insulation resistance measuring module includes a voltage doubling rectifying circuit, a current-voltage converter, a high voltage sampling circuit, a high voltage output control circuit, an a/D converter, a communication interface, and an ARM processor. The specific connection relationship is as shown in fig. 3, the device outputs the direct-current high voltage generated by the direct-current power supply through the DC/DC conversion to the transformer to be tested, so as to generate a current from the E pole to the L pole, the current is converted into a voltage value through the current-voltage converter, then the voltage value is converted through the a/D converter and then transmitted to the ARM processor for calculation processing to obtain a resistance value, and then the resistance value is transmitted to the core control platform through the communication interface. As shown in fig. 10, the transformation ratio measuring module includes a signal sampling circuit, an a/D sampling circuit, a data processing circuit, an ARM processor, a control circuit, and a communication interface. The method comprises the steps of applying power supply voltage to a high-voltage end of a transformer, simultaneously obtaining sampling voltage at the high-voltage end and a low-voltage end of the transformer by adopting a high-precision A/D sampling circuit, and then calculating the ratio of the voltages at the two sides to obtain the transformer transformation ratio. The on-load switch testing module is controlled by the RAM processor, and accurate measurement of parameters such as transition time, transition waveform, transition resistance, three-phase synchronism and the like of the on-load tap-changer is achieved through the internal measuring circuit. When the switch state changes, the processor changes the relative position on a time axis according to the state of each signal in the complete transition action data, and each transition time parameter is automatically calculated and displayed.

As shown in fig. 11, the dielectric loss measurement module includes a variable frequency power supply, a step-up transformer, a forward/reverse current detection circuit of the measured loop, a measurement and a/D conversion circuit, a communication interface, and a RAM processor. As shown in the figure, the device comprises a standard loop (Cn) and a tested loop (Cx), wherein the standard loop consists of a built-in standard high-stability capacitor and a measuring line, the tested loop consists of a tested object and a measuring line, and the measuring line consists of a sampling resistor, a preamplifier and an A/D converter. The amplitude and the phase of the standard loop current and the tested loop current are respectively measured by the measuring circuit and are collected by the high-speed sampling circuit in real time, and the capacitance value and the dielectric loss tangent value of the test article can be obtained by the single chip microcomputer system through vector operation. After the measurement is started, the program control variable frequency power supply adjusts the output voltage to a set value slowly at a constant speed by adopting an algorithm, and the measuring circuit adjusts the output high voltage to accurate high voltage output. According to the setting of positive/negative connection lines, the measuring circuit automatically selects input and switches measuring range according to test current, the measuring circuit adopts Fourier transform to filter out interference, signal fundamental wave is separated out, vector operation is carried out on standard current and test current, amplitude value calculation capacitance and angular difference calculation tg delta are carried out, repeated measurement is carried out for many times, and an intermediate result is selected through sequencing.

The on-load switch testing module is controlled by the RAM processor, and accurate measurement of parameters such as transition time, transition waveform, transition resistance, three-phase synchronism and the like of the on-load tap-changer is achieved through the internal measuring circuit. During testing, a direct current voltage is applied to the on-load tap-changer, and the closed state inside the on-load tap-changer is measured. After the switch acts, the sampling circuit automatically samples signals, the duration time of single sampling data is set, the RAM processor analyzes and processes the sampled data, and whether the opening and closing state of the on-load tap-changer changes or not is judged. When the switch state changes, the RAM processor automatically calculates and displays each transition time parameter according to the complete transition action, namely the relative position of the state transition of each path of signal in the data on the time axis.

The short-circuit impedance measurement module adopts a voltammetry method, the outgoing line on one side of the transformer is in short circuit before testing, the conducting wire for short circuit has enough sectional area, and the good contact of all outgoing line terminals is kept. The output voltage of the testing instrument is applied to the other side of the tested transformer to generate the current flowing through the impedance, and the current and the voltage applied to the impedance are measured at the same time, and the ratio of the voltage to the fundamental wave component of the current is the short-circuit impedance of the tested transformer. In the transformer short-circuit impedance test, a voltage is generally applied to the high-voltage winding side of the transformer to be tested, and a short circuit is performed on the low-voltage winding side. In order to ensure the testing precision, the voltage measuring loop is directly connected to the outgoing line terminal of the tested transformer so as to avoid introducing voltage drop on the current lead. The short-circuit impedance test of the transformer is the most direct method for detecting whether the winding of the transformer is deformed or not after the transformer is impacted by short-circuit current in operation or the transformer is impacted by mechanical force in transportation and installation, and has important significance for judging whether the transformer can be put into operation or not.

And the winding deformation testing module is used for judging the winding deformation possibly generated by the transformer according to the change degree of the amplitude-frequency response characteristic by detecting the amplitude-frequency response characteristic of each winding of the transformer and comparing the detection result longitudinally or transversely. The system adopts a developed and perfected internal fault frequency response analysis method in developed countries in the world at present according to the measurement of the characteristic parameters of the windings in the transformer, and the internal fault of the transformer is accurately judged. Under the action of voltage with higher frequency, each winding of the transformer can be regarded as a passive linear dual-port network formed by distribution parameters such as linear resistance, inductance (mutual inductance) and capacitance, and the internal characteristics of the passive linear dual-port network can be described by a transfer function. If the winding is deformed, parameters such as distributed inductance and capacitance inside the winding are inevitably changed, so that the zero point and the pole of the equivalent network transfer function are changed, and the frequency response characteristic of the network is changed.

It should be noted that, in the embodiment of the present invention, the above-mentioned functional test modules, i.e., the dc resistance measurement module, the insulation resistance measurement module, the transformation ratio measurement module, the on-load switch test module, the dielectric loss measurement module, the short-circuit impedance measurement module and the winding deformation test module, all adopt related test measurement modules in the existing corresponding tester, and the measurement test principle is not changed. The direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short circuit impedance measuring module and the winding deformation testing module are not described in detail herein.

In summary, the invention can switch and output the test wiring channels of different transformer test items through the wiring switching device, thereby solving the problems that the transformer needs to be climbed for many times to test the disconnection and the wire replacement of the connecting wire when different test items are carried out on the power transformer in the prior art. The number of times that the staff scrambleed the transformer can be reduced, operating time is reduced, work efficiency is improved, and the probability of safety accident is reduced. Through the test access switching of the wiring switching device, the multifunctional transformer parameter testing device does not need to be changed, the operation is simple, the influence on the testing precision of the multifunctional transformer parameter testing device is small, and the accuracy of the multifunctional transformer parameter testing device can be ensured.

Fig. 12 is a schematic diagram of an application of the integrated multifunctional transformer testing apparatus of the present invention, the application is a split structure, that is, the connection switching device and the multifunctional transformer parameter testing device are separated and independent from each other, and are respectively designed in two apparatus cabinets, and the two are connected by using a testing connection line. The integrated type is that the wiring switching device and the multifunctional transformer parameter testing device are integrally designed in an equipment cabinet, one side of the equipment cabinet is provided with a wiring terminal block module, and a testing connecting wire and a terminal are adopted between the wiring switching device and the multifunctional transformer parameter testing device for carrying out the optional connection of corresponding testing channels.

The wiring switching device designed by the invention has simple design change, can change the number of the high-power relays and the intermediate relays according to the function requirements of different external test equipment, controls the combination of the suction state and the disconnection state of different relays to form connecting passages with different test requirements, and realizes the switching of test circuits. It should be noted that the number and types of relays used in the present invention are not limited to those described in the description, and the use of different numbers or types of relays also falls within the protection scope of the present invention. It should be noted that the number, combination or corresponding manner of the connection terminals for connecting the tested transformer and the connection terminals for connecting the external testing equipment according to the present invention is not limited to that described in the specification. The manner of controlling the relay to close according to the present invention is not limited to the manner or method described in the specification.

In addition, the multifunctional transformer parameter testing device integrates various different function testing modules, so that various conventional testing functions are integrated into a system, the field use is convenient, the efficient detection of the transformer power failure testing project can be completed without carrying a plurality of instruments of different testing projects, the inconvenience caused by the conventional instrument and equipment test is overcome, the wiring is convenient, the testing wiring workload is reduced, and the equipment weight is reduced.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.

Claims

1. The utility model provides a can be nimble tangent line control's multi-functional transformer test equipment of integrated form which characterized in that, includes wiring auto-change over device and multi-functional transformer parameter test device, wiring auto-change over device connect the transformer of being surveyed with multi-functional transformer parameter test device, wiring auto-change over device is equipped with a plurality of optional normally open test circuit that leads to, through the actuation or the off-state that change relay module, switches over to be the corresponding required test access of multi-functional transformer parameter test device.

2. The flexible tangentially-controllable integrated multifunctional transformer test equipment according to claim 1, wherein the wiring switching device comprises:

3. The integrated multifunctional transformer testing device capable of achieving the flexible tangential control as claimed in claim 2, further comprising a terminal block connected with the relay combination, wherein the terminal block comprises a transformer terminal and a testing device terminal, the transformer terminal is connected with a tested transformer winding in a wiring manner, and the testing device terminal is connected with the multifunctional transformer parameter testing device.

4. The flexibly tangential controllable integrated multifunctional transformer test device as claimed in claim 3, wherein the relay assembly comprises a plurality of high power relays and intermediate relays sequentially connected in series or parallel combination according to control logic, the transformer terminals are respectively connected to the normally closed points of the high power relays and the input points of the intermediate relays, and the test device terminals are respectively connected to the common terminals of the high power relays and the output terminals of the intermediate relays.

5. The flexibly tangential controllable integrated multifunctional transformer test device according to claim 3, wherein the transformer terminals comprise current terminals and voltage terminals, the current terminals comprise a high voltage current terminal for connecting the transformer high voltage side detection and a low voltage current terminal for connecting the transformer low voltage side detection, and the voltage terminals comprise a high voltage terminal for connecting the transformer high voltage side detection and a low voltage terminal for connecting the transformer low voltage side detection.

6. The flexible tangential control integrated multifunctional transformer test equipment as claimed in claim 3, wherein the test device connection terminals comprise a current detection terminal and a voltage detection terminal.

7. The integrated multifunctional transformer testing device with flexible tangent control as claimed in claim 2, wherein the wiring switching device further comprises a power switch connected to the operating power supply, and an operation button and a communication port connected to the multi-relay control module.

8. The integrated multifunctional transformer testing device with flexible tangential control according to claim 1, wherein the multifunctional transformer parameter testing apparatus comprises a core control platform, a power module, a relay switching module, a terminal module, a communication interface module integrated in a device cabinet, and a DC resistance measuring module, an insulation resistance measuring module, a transformation ratio measuring module, a load switch testing module, a dielectric loss measuring module, a short-circuit impedance measuring module and a winding deformation testing module for detecting different testing data of the transformer, wherein the DC resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module are respectively connected with the power module through the relay switching module, the transformer to be tested is connected with the direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module through the wiring terminal module respectively, the core control platform is connected with the direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module through the communication interface module respectively, and the core control platform is connected with the relay switching module through the communication interface module.

9. The integrated multifunctional transformer testing device with flexible tangent control as claimed in claim 8, wherein the relay switching module comprises seven relays connected to the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module in a one-to-one correspondence manner, an output terminal of the power supply module is connected to a common terminal of a moving point of the relay switching module by a power line, and a normally open terminal of each relay is connected to power terminals of the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module in a corresponding manner.

10. The integrated multifunctional transformer testing device with flexible tangent control as claimed in claim 8, wherein the terminal module comprises a terminal panel and a plurality of terminals fixed on the terminal panel, the input terminals of the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module are respectively connected to corresponding terminals, and the corresponding terminals and the tested transformer are connected by test wires to connect the corresponding detection circuits.