CN117849460A - Nuclear power plant distribution board testing device - Google Patents

Abstract

The invention relates to a nuclear power plant switchboard testing device, which comprises a low-resistance testing unit, an insulation resistance testing unit, a main control unit and a plurality of testing control units, wherein the insulation resistance testing unit is connected with the main control unit; each test control unit comprises a first switch unit, a second switch unit and a third switch unit; the main control unit is used for automatically testing the contact resistance and the insulation resistance of the main loop of the distribution board to be tested by controlling the work of the low-resistance test unit, the insulation resistance test unit, the main control unit and the plurality of test control units, so that the wiring procedure can be saved, and the main control unit has the advantages of high test efficiency and high accuracy.

Description

Nuclear power plant distribution board testing device

Technical Field

The invention relates to the technical field of performance testing of distribution boards, in particular to a testing device for a distribution board of a nuclear power plant.

Background

In a nuclear power plant, a low-voltage switchboard is used as an important device, and whether the performance of the switchboard is qualified or not is an important basis for maintaining the safe and stable operation of the nuclear power plant, so that a worker needs to test the performance (such as the contact resistance, the insulation resistance and the like of a main loop) of the switchboard regularly to determine that the switchboard is normal. In the related art, the existing test mode can only be matched with various instruments, the switching on and off is completed by controlling the main loop of the switchboard, the measurement of contact resistance and insulation resistance is realized, the wire is required to be detached again when one instrument is replaced, and only after each item is tested, the measurement and maintenance of one switchboard are completed, so that the method has the defects of complex test and low efficiency.

Disclosure of Invention

The invention aims to provide a nuclear power plant switchboard testing device.

The technical scheme adopted for solving the technical problems is as follows: the nuclear power plant distribution board testing device comprises a low-resistance testing unit, an insulation resistance testing unit, a main control unit and a plurality of testing control units;

each test control unit comprises a first switch unit, a second switch unit and a third switch unit; the first end of the first switch unit is connected with the first sampling end of the low-resistance test unit, the second end of the first switch unit is used for being connected with the first end of the main loop of the to-be-tested power distribution board and is connected with the first end of the third switch unit through the second switch unit, the first end of the third switch unit is used for being connected with the second end of the main loop of the to-be-tested power distribution board, the second end of the third switch unit is connected with the second sampling end of the low-resistance test unit and the sampling end of the insulation resistance test unit, and the control ends of the first switch unit, the second switch unit and the third switch unit are respectively connected with the main control unit;

the main control unit is connected with the low-resistance test unit and the insulation resistance test unit, and is used for connecting the distribution board to be tested, controlling the main loop of the distribution board to be tested to be disconnected in an internal resistance test mode, and controlling the first switch unit, the second switch unit and the third switch unit to be conducted so as to collect the test internal resistance of an instrument and a circuit when the low-resistance test unit measures contact resistance through the low-resistance test unit; in a contact resistance test mode, controlling the main loop of the to-be-tested switchboard to be closed, controlling the first switch unit and the third switch unit to be conducted and controlling the second switch unit to be disconnected so as to acquire initial contact resistance through the low-resistance test unit, and calculating the contact resistance of the main loop of the to-be-tested switchboard according to the initial contact resistance and the test internal resistance; and under the insulation resistance test mode, controlling the main loop of the to-be-tested switchboard to be closed, controlling the first switch unit and the third switch unit to be conducted and controlling the second switch unit to be disconnected, so as to acquire the insulation resistance of the main loop of the to-be-tested switchboard through the insulation resistance test unit.

Preferably, each of said test control units further comprises a comprehensive fault detection loop;

the comprehensive fault detection loop is used for connecting a fault feedback loop of the distribution board to be tested so as to generate an abnormal feedback signal according to the state of the fault feedback loop before the relevant work of the test mode is executed;

the main control unit is also connected with the comprehensive fault detection loop and is also used for connecting with the fault feedback loop and controlling the comprehensive fault detection loop to work so as to prohibit the execution of the related work of the test mode on the abnormal distribution board to be tested when the abnormal feedback signal is received.

Preferably, the comprehensive fault detection circuit comprises a first relay KA111 and a second relay XK103;

the first end of the switch loop of the first relay KA111 is connected with the first direct-current voltage positive end, the second end of the switch loop of the first relay KA111 is used for being connected with the first end of the fault feedback loop, the exciting coil of the first relay KA111 is connected with the main control unit, the first end of the exciting coil of the second relay XK103 is used for being connected with the second end of the fault feedback loop, the second end of the exciting coil of the second relay XK103 is connected with the first direct-current voltage negative end, and the switch loop of the second relay XK103 is connected with the main control unit.

Preferably, the low resistance test unit comprises a fourth switch unit, a fifth switch unit and a low resistance tester;

the first end of each first switch unit is simultaneously connected with the first end of the fourth switch unit, the second end of the fourth switch unit is connected with the first sampling end of the low-resistance tester, the second end of each third switch unit is simultaneously connected with the first end of the fifth switch unit, the second end of the fifth switch unit is connected with the second sampling end of the low-resistance tester, and the control ends of the fourth switch unit and the fifth switch unit are connected with the main control unit;

wherein the fourth switching unit includes four ninth relays, and the fifth switching unit includes three tenth relays.

Preferably, the insulation resistance test unit comprises a sixth switch unit, a seventh switch unit and an insulation resistance tester;

the second ends of the third switch units are simultaneously connected with the first end of the sixth switch unit, the second end of the sixth switch unit is connected with the first sampling end of the insulation resistance tester, the second sampling end of the insulation resistance tester is connected to the ground through the seventh switch unit, and the control ends of the sixth switch unit and the seventh switch unit are connected with the main control unit;

Wherein the sixth switching unit includes three third relays, and the seventh switching unit includes an eleventh relay.

Preferably, the nuclear power plant switchboard testing device further comprises a touch screen, a control panel and a voice playing unit;

the touch screen is connected with the main control unit and is used for determining at least one to-be-tested switchboard to be tested according to a first setting operation, setting the test mode and displaying a circuit schematic diagram, a test process quantity and a test result corresponding to the current test mode when relevant work of the test mode is executed;

the control panel is connected with the main control unit and used for controlling starting, resetting or scram of test work according to a second setting operation;

the voice playing unit is connected with the main control unit and used for playing voice information capable of prompting the test module mode process according to the audio information output by the main control unit.

Preferably, the first switching unit includes a fourth relay KM102, the second switching unit includes a fifth relay KM105, and the third switching unit includes a sixth relay KM104;

the first end of the switch loop of the fourth relay KM102 is connected with the first sampling end of the low-resistance testing unit, the second end of the switch loop of the fourth relay KM102 is used for being connected with the first end of the main loop of the distribution board to be tested, and is connected to the first end of the switch loop of the sixth relay KM104 through the switch loop of the fifth relay KM105, the first end of the switch loop of the sixth relay KM104 is used for being connected with the second end of the main loop of the distribution board to be tested, the second end of the switch loop of the sixth relay KM104 is connected with the second sampling end of the low-resistance testing unit and the sampling end of the insulation resistance testing unit, and exciting coils of the fourth relay KM102, the fifth relay KM105 and the sixth relay KM104 are respectively connected with the main control unit.

Preferably, the nuclear power plant switchboard testing device further comprises a voltage acquisition unit;

the voltage acquisition unit is connected with the main control unit and is used for connecting the main loop of the to-be-tested switchboard and measuring the input alternating voltage and the output alternating voltage of the main loop of the to-be-tested switchboard under the control of the main control unit.

Preferably, the voltage acquisition unit comprises an alternating voltage acquisition module (81) and a plurality of sub-voltage sampling units; each sub-voltage sampling unit comprises a seventh relay KM101 and an eighth relay KM103;

the first end of a switch loop of the seventh relay KM101 is connected with three-phase alternating voltage, the second end of the switch loop of the seventh relay KM101 is used for being connected with the first end of a main loop of a to-be-tested switchboard, the first end of a switch loop of the eighth relay KM103 is used for being connected with the second end of the main loop of the to-be-tested switchboard, the second end of the switch loop of the eighth relay KM103 is connected with the first alternating current sampling end of the alternating current voltage acquisition module (81), the second alternating current sampling end of the alternating current voltage acquisition module (81) is connected with three-phase alternating voltage, and exciting coils of the seventh relay KM101 and the eighth relay KM103 are connected with the main control unit.

Preferably, the main control unit comprises a PLC module, a main loop control unit, a test control loop and a power supply unit;

the main loop control unit comprises a plurality of twelfth relays which are in one-to-one correspondence with the test control units; the switching loops of the twelfth relays are respectively connected between the main loop switching control loop of each distribution board to be tested and the second direct-current voltage one by one, and the exciting coils of the twelfth relays are respectively connected with the PLC module;

the test control loop includes five thirteenth relays; the first ends of the switch loops of the thirteenth relays are simultaneously connected with a live wire, the second ends of the switch loops of the thirteenth relays are respectively connected to a zero line through exciting coils of the fourth relay KM102, the fifth relay KM105, the sixth relay KM104, the seventh relay KM101 and the eighth relay KM103 in a one-to-one mode, and the exciting coils of the thirteenth relays are respectively connected with the PLC module;

the power supply unit is connected with the comprehensive fault detection loop, the voltage acquisition unit and the main loop control unit, and is used for connecting a live wire and a zero wire and outputting three-phase alternating voltage, a first direct voltage and a second direct voltage.

The implementation of the invention has the following beneficial effects: providing a nuclear power plant distribution board testing device; each test control unit can be connected with one switchboard, and can automatically test the contact resistance and the insulation resistance of a plurality of switchboard main loops in sequence, so that the wiring procedure can be saved, and the test control unit has the advantages of high test efficiency and high accuracy.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a block diagram of a circuit configuration of a nuclear power plant switchboard testing apparatus in some embodiments of the present invention;

FIG. 2 is a block diagram of a circuit configuration of a test device for a nuclear power plant's switchboard in accordance with further embodiments of the present invention;

FIGS. 3a and 3b are schematic circuit diagrams of test control units in some embodiments of the invention;

FIGS. 4a and 4b are schematic circuit diagrams of low resistance test cells in some embodiments of the invention;

FIGS. 5a and 5b are schematic circuit diagrams of insulation resistance test units in some embodiments of the invention;

FIGS. 6a, 6b, and 6c are schematic circuit diagrams of fault feedback loops of a distribution board in some embodiments of the invention;

FIG. 7 is a schematic circuit diagram of a fault feedback loop coupled to a master control unit in some embodiments of the invention;

FIG. 8 is a schematic diagram of a display screen of a touch screen according to some embodiments of the invention;

FIGS. 9a and 9b are schematic circuit diagrams of a steering panel in accordance with some embodiments of the invention;

FIG. 10 is a schematic circuit diagram of a connection between a voice playing unit and a main control unit according to some embodiments of the present invention;

FIG. 11 is a schematic circuit diagram of a voltage acquisition unit in some embodiments of the invention;

FIG. 12 is a schematic circuit diagram of a main loop control unit in some embodiments of the invention;

FIG. 13 is a schematic circuit diagram of a test control loop in some embodiments of the invention;

FIGS. 14a and 14b are schematic circuit diagrams of power supply units according to some embodiments of the invention;

FIG. 15 is a schematic diagram of a nuclear power plant switchboard testing apparatus in accordance with some embodiments of the present invention;

fig. 16 is a schematic circuit diagram of a threshold switch connected to a master control unit according to some embodiments of the present invention.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.

It should be noted that the flow diagrams depicted in the figures are merely exemplary and do not necessarily include all of the elements and operations/steps, nor are they necessarily performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.

The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.

As shown in FIG. 1, the present invention provides a test apparatus for a nuclear power plant switchboard, which can automatically test the performance of a plurality of low voltage switchboards, such as the main loop contact resistance, insulation resistance, etc. of the switchboard. The device comprises a low-resistance test unit 1, an insulation resistance test unit 2, a main control unit 3 and a plurality of test control units 4.

Referring to fig. 3a and 3b, each test control unit 4 includes a first switching unit 41, a second switching unit 42, and a third switching unit 43. As shown in fig. 3a, 3b, 4a, 4b, 5a and 5b, a first end of the first switch unit 41 is connected to a first sampling end of the low resistance test unit 1, a second end of the first switch unit 41 is connected to a first end of a main loop of the to-be-tested switchboard 100 and is connected to a first end of the third switch unit 43 through the second switch unit 42, a first end of the third switch unit 43 is connected to a second end of the main loop of the to-be-tested switchboard 100, a second end of the third switch unit 43 is connected to a second sampling end of the low resistance test unit 1 and a sampling end of the insulation resistance test unit 2, and control ends of the first switch unit 41, the second switch unit 42 and the third switch unit 43 are respectively connected to the main control unit 3.

The main control unit 3 is connected with the low resistance test unit 1 and the insulation resistance test unit 2. The main control unit 3 is used for connecting a to-be-tested switchboard, and in an internal resistance test mode, controlling the main loop of the to-be-tested switchboard to be disconnected, and controlling the first switch unit 41, the second switch unit 42 and the third switch unit 43 to be conducted so as to collect the test internal resistance of the instrument and the circuit when the low resistance test unit 1 measures the contact resistance through the low resistance test unit 1; in the contact resistance test mode, the main circuit of the to-be-tested switchboard is controlled to be closed, the first switch unit 41 and the third switch unit 43 are controlled to be turned on, and the second switch unit 42 is controlled to be turned off, so that initial contact resistance is acquired through the low-resistance test unit 1, and then the contact resistance of the main circuit of the to-be-tested switchboard is calculated according to the initial contact resistance and the test internal resistance; in the insulation resistance test mode, the main circuit of the electrical panel to be tested is controlled to be closed, the first switching unit 41 and the third switching unit 43 are controlled to be turned on, and the second switching unit 42 is controlled to be turned off, so that the insulation resistance of the main circuit of the electrical panel to be tested is collected through the insulation resistance test unit 2.

It should be noted that, as shown in fig. 3a, the first end (003 BN) of the main circuit of the switchboard 100 includes an input end of three phase lines, and similarly, the second end (002 BN) of the main circuit of the switchboard 100 includes an output end of three phase lines, and the first switching unit 41, the second switching unit 42 and the third switching unit 43 may be three-throw switching devices, so as to simultaneously control the closing or opening of the three phase lines on the line where they are located.

Referring to fig. 3a, in this embodiment, the testing principle of the present device for collecting the main loop contact resistance of the switchboard is as follows: firstly, in an internal resistance test mode, the main control unit 3 controls the main circuit of the distribution board to be tested to be disconnected and the first switch unit 41, the second switch unit 42 and the third switch unit 43 to be conducted, so that necessary cables form a passage when two sampling ends of the low resistance test unit 1 are tested to contact resistance, and at the moment, the resistance value acquired by the low resistance test unit 1 is the sum of the internal resistance of the low resistance test unit 1 and the line resistance of the necessary connection cable (namely, the test internal resistance); then, the main control unit 3 switches to a contact resistance test mode, and controls the main circuit of the to-be-tested switchboard to be closed, the first switch unit 41 and the third switch unit 43 to be turned on, and the second switch unit 42 to be turned off, so that the low resistance test unit 1 is turned on with the main circuit of the switchboard, and further the initial contact resistance is acquired through the low resistance test unit 1, and then the contact resistance of the main circuit of the to-be-tested switchboard can be obtained by subtracting the test internal resistance from the initial contact resistance. In addition, the final test internal resistance can be obtained by measuring the internal resistance of the second switch unit 42 when being conducted in advance and storing the internal resistance in the main control unit 3, and subtracting the conducted internal resistance of the second switch unit 42 from the resistance value acquired by the low-resistance test unit 1 in the internal resistance test mode, so that the measurement accuracy of the contact resistance can be further improved.

Further, the principle of testing the insulation resistance of the main loop is as follows: in the insulation resistance test mode, the main control unit 3 controls the main loop of the to-be-tested switchboard to be closed, the first switching unit 41 and the third switching unit 43 to be conducted, and the second switching unit 42 to be disconnected, so that the main loop is connected with the insulation resistance test unit 2, and further the insulation resistance of each phase line in the main loop of the to-be-tested switchboard can be collected through the insulation resistance test unit 2.

In this embodiment, the staff can connect each test control unit 4 with a plurality of distribution boards to be tested one by one respectively, then under the control of the main control unit 3, can test the contact resistance and the insulation resistance of these distribution board main loop automatically in proper order, not only can save the wiring process, still have the advantage that efficiency of software testing and degree of accuracy are high.

Alternatively, the number of test control units 4 is 6.

In some embodiments, as shown in fig. 3a, the first switching unit 41 comprises a fourth relay KM102, the second switching unit 42 comprises a fifth relay KM105, and the third switching unit 43 comprises a sixth relay KM104. Specifically, the first end of the switch loop of the fourth relay KM102 is connected to the first sampling end of the low-resistance test unit 1, the second end of the switch loop of the fourth relay KM102 is used for connecting the first end of the main loop of the to-be-tested switchboard 100, and is connected to the first end of the switch loop of the sixth relay KM104 through the switch loop of the fifth relay KM105, the first end of the switch loop of the sixth relay KM104 is used for connecting the second end of the main loop of the to-be-tested switchboard 100, the second end of the switch loop of the sixth relay KM104 is connected to the second sampling end of the low-resistance test unit 1 and the sampling end of the insulation resistance test unit 2, and the exciting coils of the fourth relay KM102, the fifth relay KM105 and the sixth relay KM104 are respectively connected to the main control unit 3.

In the present embodiment, the main control unit 3 can control on or off of the first, second, and third switching units by controlling excitation and demagnetization of the excitation coils of the fourth relay KM102, the fifth relay KM105, and the sixth relay KM 104.

In some embodiments, as shown in fig. 6a and 6b, each test control unit 4 further includes a comprehensive fault detection loop 44. The integrated fault detection loop 44 is used to connect a fault feedback loop of the switchboard under test 100 to generate an abnormal feedback signal according to the state of the fault feedback loop before performing the related work of the test modes (including the internal resistance test mode, the contact resistance test mode and the insulation resistance test mode). The main control unit 3 is further connected to the comprehensive fault detection circuit 44, and the main control unit 3 is further configured to connect to the fault feedback circuit and control the comprehensive fault detection circuit 44 to operate, so as to prohibit the execution of the related operation of the test mode on the abnormal power distribution board 100 to be tested when the abnormal feedback signal is received.

Further, as shown in fig. 6a and 6c, the integrated fault detection circuit 44 may include a first relay KA111 and a second relay XK103. Specifically, the first end of the switching circuit of the first relay KA111 is connected to the first direct voltage positive end, the second end of the switching circuit of the first relay KA111 is used to connect to the first end of the fault feedback circuit, the exciting coil of the first relay KA111 is connected to the main control unit 3 (not shown in the exciting coil of the first relay KA 111), the first end of the exciting coil of the second relay XK103 is used to connect to the second end of the fault feedback circuit, the second end of the exciting coil of the second relay XK103 is connected to the first direct voltage negative end, and the switching circuit of the second relay XK103 is connected to the main control unit 3 (not shown in the switching circuit of the second relay XK 103).

In this embodiment, referring to fig. 6a, 6b, 6c and 8, the main control unit 3 controls the first relay KA111 to excite, so that the first direct current voltage supplies power to the fault feedback loop of the to-be-tested switchboard 100, if the to-be-tested switchboard 100 has no fault, the circuit breaker 002JA and the micro switch X5 in the to-be-tested switchboard 100 will both be kept in a closed state, the exciting coil of the second relay XK103 will excite, so that the switching loop of the second relay XK103 will be closed or opened, so that the main control unit 3 can determine whether the circuit breaker 002JA and the micro switch X5 are both in a closed state by detecting the open and close state of the switching loop of the second relay XK103, if any device of the circuit breaker 002JA and the micro switch X5 is not closed, the exciting coil of the second relay XK103 will be demagnetized, and the main control unit 3 will prohibit the execution of the related work of the test mode to the abnormal to be-tested switchboard 100; if the exciting coil of the second relay XK103 is excited, the main control unit 3 further determines whether a fault occurs by communicating with the distribution board 100 to be tested. If the fault feedback loop is fault-free and the fuse 001FU is assumed to be in an open state, the micro switch S20 will be normally triggered and the relay 004XD will be excited, so that the relay 1KA is excited, and then the normally open loop of the relay 1KA (fig. 6b and 7) and the relay 009XR are excited, so that the relay 009XR is demagnetized, and the normally open loop of the relay 004XD is closed (the normally open loop of the relay 004XD is connected with the main control unit 3, not shown), so that the main control unit 3 detects that the distribution board is fault-free, and if the main control unit 3 determines that the distribution board is fault through the contact state of the relay 004XD, the execution of the related operation of the test mode on the abnormal distribution board 100 to be tested is also prohibited. It can be appreciated that, in this embodiment, by matching the comprehensive fault detection loop 44 with the fault feedback loop in the to-be-tested switchboard 100, it can be determined whether the switchboard 100 has a fault, and if so, the subsequent test work on the switchboard 100 is prohibited, so that the fault switchboard is prevented from doing idle work.

In some embodiments, as shown in fig. 4a and 4b, the low resistance test unit 1 includes a fourth switch unit 11, a fifth switch unit 12, and a low resistance tester 13. Specifically, the first end of each first switch unit 41 is simultaneously connected to the first end of the fourth switch unit 11, the second end of the fourth switch unit 11 is connected to the first sampling end of the low resistance tester 13, the second end of each third switch unit 43 is simultaneously connected to the first end of the fifth switch unit 12, the second end of the fifth switch unit 12 is connected to the second sampling end of the low resistance tester 13, and the control ends of the fourth switch unit 11 and the fifth switch unit 12 are connected to the main control unit 3.

The low resistance tester 13 may be a high-precision low resistance tester with model TC3544, and the low resistance tester 13 is further in communication with the main control unit 3 to send the tested initial contact resistance and the tested internal resistance to the main control unit 3.

It should be noted that, the cables controlled to be turned on and off by the first switch unit 41, the third switch unit 43, the fourth switch unit 11 and the fifth switch unit 12 are three-phase cables, it is easy to understand that the connection between the first end of each first switch unit 41 and the first end of the fourth switch unit 11 means that the three phase connection ends in the first switch unit 41 are connected one-to-one with the three phase connection ends in the fourth switch unit 11, and the connection between other switch units is the same as that described in fig. 3a and 4 a.

In this embodiment, the main control unit 3 may control the fourth switch unit 11 and the fifth switch unit 12 to be turned on, so that the low resistance tester 13 is turned on with one of the test control units 4 (the on/off of the first switch unit 41, the second switch unit 42, and the third switch unit 43 in the test control unit 4 need to be correspondingly controlled according to the test mode).

In some embodiments, as shown in fig. 4a, the fourth switching unit 11 comprises four ninth relays (relays KA010, KA011, KA012 and KA013, respectively) and the fifth switching unit 12 comprises three tenth relays (relays KA021, KA022 and KA023, respectively). Specifically, the excitation coils of each ninth relay and each tenth relay are respectively connected with the main control unit 3; the first ends of the normally open loops of the three ninth relays are respectively three phase line connection ends of the first end of the fourth switch unit 11, the second ends of the normally open loops of the three ninth relays are simultaneously connected with the first sampling end of the low-resistance tester 13, and the normally open loops of the remaining one ninth relay are connected in series between the first sampling end of the low-resistance tester 13 and the ground; the first ends of the normally open loops of the three tenth relays are respectively three phase line connection ends of the first ends of the fifth switch unit 12, and the second ends of the normally open loops of the three tenth relays are simultaneously connected with the second sampling end of the low-resistance tester 13.

In this embodiment, the main control unit 3 may measure the contact resistance of one phase of the main circuit of the electrical panel to be tested by controlling excitation of each nine relay and each tenth relay, see fig. 3a and fig. 4a, for example, simultaneously controlling excitation of the ninth relay KA010 and the tenth relay KA021, then controlling conduction of the first switch unit 41 and the third switch unit 43 in a certain test control unit 4, then controlling conduction of the second switch unit 42 and controlling disconnection of the main circuit of the electrical panel to be tested connected with the certain test control unit 4, so that the test internal resistance of one phase of the electrical panel to be tested may be measured, then controlling disconnection of the second switch unit 42 and controlling connection of the main circuit of the electrical panel to be tested, and thus the initial contact resistance of one phase of the electrical panel to be tested may be measured.

In some embodiments, as shown in fig. 5a, the insulation resistance testing unit 2 includes a sixth switching unit 21, a seventh switching unit 22, and an insulation resistance tester 23. Specifically, the second end of each third switch unit 43 is simultaneously connected to the first end of the sixth switch unit 21, the second end of the sixth switch unit 21 is connected to the first sampling end of the insulation resistance tester 23, the second sampling end of the insulation resistance tester 23 is connected to the ground through the seventh switch unit 22, and the control ends of the sixth switch unit 21 and the seventh switch unit 22 are connected to the main control unit 3.

The insulation resistance tester 23 may be an insulation resistance tester with a model number TC2683, and the insulation resistance tester 23 is further in communication connection with the main control unit 3 to send the tested insulation resistance to the main control unit 3.

In some embodiments, as shown in fig. 5a and 5b, the sixth switching unit 21 comprises three third relays (relays KA041, KA042 and KA043, respectively) and the seventh switching unit 22 comprises an eleventh relay KA031. Specifically, the eleventh relay KA031 and the exciting coils of the third relays are respectively connected with the main control unit 3; the normally open loop of the eleventh relay KA031 is connected in series between the second sampling end of the low-resistance tester 13 and the ground; the first ends of the normally open loops of the three third relays are respectively three phase line connecting ends of the first ends of the sixth switch unit 21, and the second ends of the normally open loops of the three third relays are simultaneously connected with the first sampling end of the low-resistance tester 13.

In this embodiment, the main control unit 3 may measure the insulation resistance of one phase of the main circuit of the to-be-measured switchboard by controlling excitation of the eleventh relay KA031 and each third relay, see fig. 3a and fig. 5a, for example, simultaneously controlling excitation of the eleventh relay KA031 and the third relay KA041, then controlling conduction of the third switch unit 43 in a certain test control unit 4, and then controlling conduction of the main circuit of the to-be-measured switchboard connected to the certain test control unit 4, so that the insulation resistance of one phase of the to-be-measured switchboard may be measured.

In some embodiments, as shown in fig. 2, a touch screen 5, a manipulation panel 6, and a voice playing unit 7 are further included.

The touch screen 5 is connected with the main control unit 3, and the touch screen 5 is used for determining at least one to-be-tested switchboard 100 to be tested according to a first setting operation and setting a test mode, and displaying a circuit schematic diagram, a test process quantity and a test result corresponding to a current test mode when related work of the test mode is executed. Specifically, taking the insulation resistance test mode as an example, the touch screen 5 may display the related circuit schematic diagrams shown in fig. 3a and 5a when the insulation resistance test mode is performed, thereby facilitating the analysis and test process of the staff. In addition, the test process quantity can comprise a voltage power supply of each phase line, a closing response time, a tripping response time, a comprehensive fault detection result, a 009XR loop detection result and the like; the test result may include an initial contact resistance, a test internal resistance and an insulation resistance of each phase line of the distribution board to be tested, and the screen displayed by the touch screen 5 may refer to fig. 8 specifically.

The control panel 6 is connected with the main control unit 3, and the control panel 6 is used for controlling start, reset or scram of test work according to the second setting operation.

In some embodiments, as shown in fig. 9a, the dashboard 6 includes a start button SB1, a reset button SB2, and a scram button SB3. The starting button SB1, the reset button SB2 and the emergency stop button SB3 are respectively connected with the main control unit 3 and the second direct-current voltage, so that a worker can input corresponding instructions by pressing the buttons.

Further, as shown in fig. 9b, the control panel 6 may further include a first indicator lamp H1, a second indicator lamp H2, a third indicator lamp H3, a buzzer H4, and a start button indicator lamp H5. Specifically, the first indicator lamp H1, the second indicator lamp H2, the third indicator lamp H3, the buzzer H4, and the start button indicator lamp H5 are respectively connected between the main control unit 3 and the second dc voltage. The main control unit 3 controls different states of the on-off display device of the first indicator lamp H1, the second indicator lamp H2 and the third indicator lamp H3, so that colors of the first indicator lamp H1, the second indicator lamp H2 and the third indicator lamp H3 can be different for convenience of identification; when an abnormality is detected (such as comprehensive fault, overvoltage of power supply voltage, etc.), the main control unit 3 can remind the staff by controlling the buzzer H4 to fail; finally, the main control unit 3 also has a state of a start button to control the on/off of the start button indicator lamp so as to prompt the staff.

As shown in fig. 10, the voice playing unit 7 is connected with the main control unit 3. The voice playing unit 7 is configured to play voice information capable of prompting a test module mode process according to the audio information output by the main control unit 3, taking the insulation resistance test module as an example, in the starting stage, the voice information played by the voice playing unit 7 may be "insulation resistance test start", and after the test is completed, "insulation resistance test end" may be played, and of course, the voice information may also include voices prompting other states, such as voices capable of playing result and prompting inspection objects, such as playing "please inspect fuse 001FU and micro switch S20", when an integrated fault is detected. In addition, the voice playing unit 7 may be an existing voice playing module.

In some embodiments, as shown in fig. 2, the test device of the power panel 100 of the nuclear power plant further comprises a voltage acquisition unit 8. The voltage acquisition unit 8 is connected with the main control unit 3. The voltage acquisition unit 8 is used for connecting the main circuit of the to-be-tested switchboard 100, and measuring the input ac voltage (i.e. the power supply voltage) and the output ac voltage (i.e. the main circuit output voltage) of the main circuit of the to-be-tested switchboard 100 under the control of the main control unit 3.

Further, as shown in fig. 3a and 11, the voltage acquisition unit 8 may include an ac voltage acquisition module 81 and a plurality of sub-voltage sampling units. Each sub-voltage sampling unit may include a seventh relay KM101, an eighth relay KM103. Specifically, the first end of the switching circuit of the seventh relay KM101 is connected to a three-phase ac voltage (i.e., a power supply voltage), the second end of the switching circuit of the seventh relay KM101 is used to connect the first end of the main circuit of the to-be-tested switchboard 100, the first end of the switching circuit of the eighth relay KM103 is used to connect the second end of the main circuit of the to-be-tested switchboard 100, the second end of the switching circuit of the eighth relay KM103 is connected to the first ac sampling end (IN 4, IN5, and IN6, respectively) of the ac voltage acquisition module 81, the second ac sampling end (IN 1, IN2, and IN3, respectively) of the ac voltage acquisition module 81 is connected to the three-phase ac voltage, and the exciting coils of the seventh relay KM101 and the eighth relay KM103 are connected to the main control unit 3.

The ac voltage collecting module 81 may be an ac voltage collecting module with a model of PD3058-6ACU, and the ac voltage collecting module 81 is further connected to the main control unit 3 in a communication manner, so as to send the tested input ac voltage and the tested output ac voltage to the main control unit 3.

Accordingly, in this embodiment, the main control unit 3 is further configured to control the main circuit of the to-be-tested switchboard 100 to be closed and control the seventh relay KM101 and the eighth relay KM103 to be excited in the ac voltage test mode, so that both the seventh relay KM101 and the eighth relay KM103 are closed, thereby testing the input ac voltage and the output ac voltage of the main circuit.

In some embodiments, the main control unit 3 includes a PLC module, a main loop control unit 32, a test control loop 33, and a power supply unit 34.

The main circuit control unit 32 includes a plurality of twelfth relays KA110 in one-to-one correspondence with the respective test control units 4. As shown in fig. 6b and 12, the switching circuits of the twelfth relays KA110 are respectively connected between the main circuit switching control circuit of each switchboard 100 to be tested and the second dc voltage one by one, and the exciting coils of the twelfth relays KA110 are respectively connected to the PLC module. In this embodiment, the PLC module may excite the relay 002XR in the main circuit switch control circuit of the to-be-measured switchboard 100 connected to the twelfth relay KA110 by controlling excitation of the twelfth relay KA110, so as to switch on the main circuit of the to-be-measured switchboard 100.

As shown in fig. 13, 3a and 3b, the test control loop 33 may include five thirteenth relays KA1001. Specifically, the first end of the switching circuit of each thirteenth relay KA1001 is simultaneously connected to the live wire L11, the second end of the switching circuit of each thirteenth relay is connected to the neutral wire N11 through the exciting coils of the fourth relay KM102, the fifth relay KM105, the sixth relay KM104, the seventh relay KM101 and the eighth relay KM103, respectively, one to one, and the exciting coils of each thirteenth relay are connected to the PLC module, respectively.

In this embodiment, taking the fourth relay KM102 as an example, the PLC module may excite the fourth relay KM102 by controlling the thirteenth relay KA1001 connected to the excitation coil of the fourth relay KM102, so as to make the fourth relay KM102 electrically attract, thereby controlling the normally open loop of the fourth relay KM102 to be closed, and as for the control principles of the fifth relay KM105, the sixth relay KM104, the seventh relay KM101 and the eighth relay KM103 are similar to those of the fourth relay KM102, which will not be described herein. In this embodiment, the state of the fourth relay KM102, the fifth relay KM105, the sixth relay KM104, the seventh relay KM101, and the eighth relay KM103 is controlled by the thirteenth relay KA1001, so that the PLC module can control the high-voltage device with the working voltage up to 220VAC by using the low-voltage signal, and realize isolation control, thereby improving the safety of the device.

The power supply unit 34 is connected to the integrated fault detection circuit 44, the voltage acquisition unit 8, and the main circuit control unit 32. The power supply unit 34 is used for connecting the live wire and the neutral wire, and outputting a three-phase alternating voltage, a first direct voltage and a second direct voltage.

As shown in fig. 14a and 14b, the power supply unit 34 may include a first circuit breaker F1, a power converter T1, a second circuit breaker F3, a third circuit breaker F4, a first power module V1, a power filter LC1, a second power module V2, a fourth circuit breaker F5, and a fifth circuit breaker F6. Specifically, the low-voltage side of the power converter T1 is connected to a first end of a first circuit breaker F1, a second end of the first circuit breaker F1 is connected to a mains ac voltage input end (L and N respectively), the high-voltage side of the power converter T1 is connected to a first end of a second circuit breaker F3, and a second end of the second circuit breaker F3 is configured to output the three-phase ac voltage (L1, L2 and L3 respectively); the alternating current input side of the first power supply module V1 is connected to the second end of the first circuit breaker F1 through the third circuit breaker F4, and the direct current output side of the first power supply module V1 is used for outputting the first direct current voltage (P220V, N220V); the input end of the power filter LC1 is connected with the second end of the first circuit breaker F1, one path of the output end of the power filter LC1 is connected with the low-resistance tester 13, the other path of the output end of the power filter LC1 is connected with the insulation resistance tester 23, and the power filter LC1 is used for filtering power supplies of the low-resistance tester 13 and the insulation resistance tester 23 so as to improve the working stability of the low-resistance tester 13 and the insulation resistance tester 23; the alternating current input side of the second power supply module V2 is connected to the second end of the first circuit breaker F1 through the fourth circuit breaker F5, and the direct current output side of the second power supply module V2 is used for outputting a second direct current voltage (P24V, N V); the first end of the fifth circuit breaker F6 is connected with the second end of the first circuit breaker F1, and the second end of the fifth circuit breaker F6 is used for being connected with a control circuit power supply end of a distribution board to be tested.

The first breaker F1 may be a breaker with a model of iC65N-2P10A, the second and third breakers F4 may be a breaker with a model of F3 iC65N-4P6A, and the fourth and fifth breakers F5 and F6 may be a breaker with a model of iC65N-2P 3A.

The PLC module comprises a first PLC controller, a second PLC controller and a third PLC controller, wherein the model of the first PLC controller can be DVP-14SS211R, the model of the second PLC controller can be DVP-32SM, and the model of the third PLC controller can be DVP-32SN. The specific connection relationship between the first PLC controller, the second PLC controller, and the third PLC controller and other devices may be referred to as fig. 3b, 4b, 5b, 7, 9a, 9b, 10, 12, and 13.

Fig. 15 is a schematic structural view of a test device for a nuclear power plant switchboard in some embodiments of the present invention. The device further comprises a cabinet 200 for accommodating the low-resistance test unit 1, the insulation resistance test unit 2, the main control unit 3, the touch screen 5, the control panel 6, the voice playing unit 7, the voltage acquisition unit 8 and the plurality of test control units 4, and further the cabinet 200 comprises a door structure, wherein the insulation resistance tester 23, the low-resistance tester 13 and the power supply unit 34 are arranged in the door structure. The device needs to be connected with each switchboard to be tested and a power supply in the test and the like, because the device relates to high voltage, especially when insulation resistance measurement is carried out, the insulation resistance tester 23 possibly needs to output voltage higher than 1kv, in order to avoid electric shock risks, the nuclear power plant switchboard test device further comprises a first threshold switch S1 and a second threshold switch S2 which are arranged on the door body structure, as shown in fig. 16, the first threshold switch S1 and the second threshold switch S2 are respectively connected between the main control unit 3 (a second PLC) and the second direct current voltage, and the first threshold switch S1 and the second threshold switch S2 are used for helping the main control unit 3 to detect whether a cabinet door of the door body structure is in a closed state or not. Specifically, when the cabinet door is closed, the first threshold switch S1 and the second threshold switch S2 are in a conductive state, and when the cabinet door is opened, the first threshold switch S1 and the second threshold switch S2 are disconnected. Correspondingly, the main control unit 3 is also used for immediately stopping the testing work when detecting that the cabinet door is opened, so that electric shock of staff is avoided.

It should be noted that, the fourth relay KM102, the fifth relay KM105, the sixth relay KM104, the seventh relay KM101, and the eighth relay KM103 may be existing three-phase relays;

in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (10)

1. The nuclear power plant distribution board testing device is characterized by comprising a low-resistance testing unit (1), an insulation resistance testing unit (2), a main control unit (3) and a plurality of testing control units (4);

each test control unit (4) comprises a first switch unit (41), a second switch unit (42) and a third switch unit (43); the first end of the first switch unit (41) is connected with the first sampling end of the low-resistance test unit (1), the second end of the first switch unit (41) is used for being connected with the first end of a main loop of a to-be-tested switchboard and is connected with the first end of the third switch unit (43) through the second switch unit (42), the first end of the third switch unit (43) is used for being connected with the second end of the main loop of the to-be-tested switchboard, the second end of the third switch unit (43) is connected with the second sampling end of the low-resistance test unit (1) and the sampling end of the insulation resistance test unit (2), and the control ends of the first switch unit (41), the second switch unit (42) and the third switch unit (43) are respectively connected with the main control unit (3);

the main control unit (3) is connected with the low-resistance test unit (1) and the insulation resistance test unit (2) and is used for connecting the to-be-tested switchboard, and in an internal resistance test mode, controlling the main loop of the to-be-tested switchboard to be disconnected and controlling the first switch unit (41), the second switch unit (42) and the third switch unit (43) to be conducted so as to collect the test internal resistance of an instrument and a circuit when the low-resistance test unit (1) measures contact resistance through the low-resistance test unit (1); in a contact resistance test mode, controlling the main circuit of the to-be-tested switchboard to be closed, controlling the first switch unit (41) and the third switch unit (43) to be conducted and controlling the second switch unit (42) to be disconnected so as to acquire initial contact resistance through the low-resistance test unit (1), and calculating the contact resistance of the main circuit of the to-be-tested switchboard according to the initial contact resistance and the test internal resistance; in an insulation resistance test mode, the main loop of the to-be-tested switchboard is controlled to be closed, the first switch unit (41) and the third switch unit (43) are controlled to be conducted, and the second switch unit (42) is controlled to be disconnected, so that the insulation resistance of the main loop of the to-be-tested switchboard is collected through the insulation resistance test unit (2).

2. The nuclear power plant switchboard testing device according to claim 1, characterized in that each of said test control units (4) further comprises a comprehensive fault detection loop (44);

the comprehensive fault detection loop (44) is used for connecting a fault feedback loop of the distribution board to be tested so as to generate an abnormal feedback signal according to the state of the fault feedback loop before the relevant work of the test mode is executed;

the main control unit (3) is further connected with the comprehensive fault detection loop (44), and the main control unit (3) is further used for connecting with the fault feedback loop and controlling the comprehensive fault detection loop (44) to work so as to prohibit execution of related work of the test mode on the abnormal power distribution board to be tested when the abnormal feedback signal is received.

3. The nuclear power plant switchboard testing device according to claim 2, characterized in that the comprehensive fault detection loop (44) comprises a first relay KA111 and a second relay XK103;

the first end of the switching circuit of the first relay KA111 is connected with a first direct-current voltage positive end, the second end of the switching circuit of the first relay KA111 is used for being connected with the first end of the fault feedback circuit, the exciting coil of the first relay KA111 is connected with the main control unit (3), the first end of the exciting coil of the second relay XK103 is used for being connected with the second end of the fault feedback circuit, the second end of the exciting coil of the second relay XK103 is connected with a first direct-current voltage negative end, and the switching circuit of the second relay XK103 is connected with the main control unit (3).

4. The nuclear power plant switchboard testing device according to claim 1, characterized in that the low-resistance testing unit (1) comprises a fourth switching unit (11), a fifth switching unit (12) and a low-resistance tester (13);

the first end of each first switch unit (41) is simultaneously connected with the first end of the fourth switch unit (11), the second end of the fourth switch unit (11) is connected with the first sampling end of the low-resistance tester (13), the second end of each third switch unit (43) is simultaneously connected with the first end of the fifth switch unit (12), the second end of the fifth switch unit (12) is connected with the second sampling end of the low-resistance tester (13), and the control ends of the fourth switch unit (11) and the fifth switch unit (12) are connected with the main control unit (3);

wherein the fourth switching unit (11) comprises four ninth relays and the fifth switching unit (12) comprises three tenth relays.

5. The nuclear power plant switchboard testing device according to claim 1, characterized in that the insulation resistance testing unit (2) comprises a sixth switching unit (21), a seventh switching unit (22) and an insulation resistance tester (23);

the second end of each third switch unit (43) is simultaneously connected with the first end of the sixth switch unit (21), the second end of the sixth switch unit (21) is connected with the first sampling end of the insulation resistance tester (23), the second sampling end of the insulation resistance tester (23) is connected to the ground through the seventh switch unit (22), and the control ends of the sixth switch unit (21) and the seventh switch unit (22) are connected with the main control unit (3);

Wherein the sixth switching unit (21) comprises three third relays and the seventh switching unit (22) comprises an eleventh relay.

6. The nuclear power plant switchboard testing device according to claim 1, characterized in that it further comprises a touch screen (5), a control panel (6) and a voice playing unit (7);

the touch screen (5) is connected with the main control unit (3) and is used for determining at least one switchboard to be tested according to a first setting operation, setting the test mode and displaying a circuit schematic diagram, a test process quantity and a test result corresponding to the current test mode when relevant work of the test mode is executed;

the control panel (6) is connected with the main control unit (3) and is used for controlling starting, resetting or scram of test work according to a second setting operation;

the voice playing unit (7) is connected with the main control unit (3) and is used for playing voice information capable of prompting the test module mode process according to the audio information output by the main control unit (3).

7. The nuclear power plant switchboard testing device according to any of claims 2 to 6, characterized in that said first switching unit (41) comprises a fourth relay KM102, said second switching unit (42) comprises a fifth relay KM105, and said third switching unit (43) comprises a sixth relay KM104;

The first end of the switch loop of the fourth relay KM102 is connected with the first sampling end of the low-resistance test unit (1), the second end of the switch loop of the fourth relay KM102 is used for being connected with the first end of the main loop of the to-be-tested switchboard and is connected to the first end of the switch loop of the sixth relay KM104 through the switch loop of the fifth relay KM105, the first end of the switch loop of the sixth relay KM104 is used for being connected with the second end of the main loop of the to-be-tested switchboard, the second end of the switch loop of the sixth relay KM104 is connected with the second sampling end of the low-resistance test unit (1) and the sampling end of the insulation resistance test unit (2), and exciting coils of the fourth relay KM102, the fifth relay KM105 and the sixth relay KM104 are respectively connected with the main control unit (3).

8. The nuclear power plant switchboard testing device according to claim 7, characterized in that it further comprises a voltage acquisition unit (8);

the voltage acquisition unit (8) is connected with the main control unit (3) and is used for connecting the main circuit of the to-be-tested switchboard and measuring the input alternating voltage and the output alternating voltage of the main circuit of the to-be-tested switchboard under the control of the main control unit (3).

9. The nuclear power plant switchboard testing device according to claim 8, characterized in that the voltage acquisition unit (8) comprises an alternating voltage acquisition module (81) and a plurality of sub-voltage sampling units; each sub-voltage sampling unit comprises a seventh relay KM101 and an eighth relay KM103;

the first end of a switch loop of the seventh relay KM101 is connected with three-phase alternating voltage, the second end of the switch loop of the seventh relay KM101 is used for being connected with the first end of a main loop of a to-be-tested switchboard, the first end of a switch loop of the eighth relay KM103 is used for being connected with the second end of the main loop of the to-be-tested switchboard, the second end of the switch loop of the eighth relay KM103 is connected with a first alternating current sampling end of an alternating current voltage acquisition module (81), a second alternating current sampling end of the alternating current voltage acquisition module (81) is connected with three-phase alternating voltage, and exciting coils of the seventh relay KM101 and the eighth relay KM103 are connected with a main control unit (3).

10. The nuclear power plant switchboard testing device according to claim 9, characterized in that the main control unit (3) comprises a PLC module, a main loop control unit (32), a test control loop (33) and a power supply unit (34);

The main loop control unit (32) comprises a plurality of twelfth relays which are in one-to-one correspondence with the test control units (4); the switching loops of the twelfth relays are respectively connected between the main loop switching control loop of each distribution board to be tested and the second direct-current voltage one by one, and the exciting coils of the twelfth relays are respectively connected with the PLC module;

the test control circuit (33) comprises five thirteenth relays; the first ends of the switch loops of the thirteenth relays are simultaneously connected with a live wire, the second ends of the switch loops of the thirteenth relays are respectively connected to a zero line through exciting coils of the fourth relay KM102, the fifth relay KM105, the sixth relay KM104, the seventh relay KM101 and the eighth relay KM103 in a one-to-one mode, and the exciting coils of the thirteenth relays are respectively connected with the PLC module;

the power supply unit (34) is connected with the comprehensive fault detection loop (44), the voltage acquisition unit (8) and the main loop control unit (32), and is used for connecting a live wire and a zero wire and outputting three-phase alternating current voltage, first direct current voltage and second direct current voltage.