CN111157941A - Device and method for quickly switching and checking primary winding of power transformer - Google Patents
Device and method for quickly switching and checking primary winding of power transformer Download PDFInfo
- Publication number
- CN111157941A CN111157941A CN202010062347.4A CN202010062347A CN111157941A CN 111157941 A CN111157941 A CN 111157941A CN 202010062347 A CN202010062347 A CN 202010062347A CN 111157941 A CN111157941 A CN 111157941A
- Authority
- CN
- China
- Prior art keywords
- current
- transformer
- primary winding
- current transformer
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004804 winding Methods 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012795 verification Methods 0.000 claims abstract description 25
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 19
- 238000012360 testing method Methods 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/206—Switches for connection of measuring instruments or electric motors to measuring loads
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The embodiment of the invention relates to a device and a method for quickly switching and checking a primary winding of a power transformer, which comprise a large-current booster, a standard current transformer, a current transformer to be checked, a current load box, a transformer checking instrument and at least 5 circuit breakers. The calibration device is characterized in that a primary winding input connecting end of the primary winding input connecting end is connected to different wiring connecting ends of a large-current booster and a standard current transformer through a plurality of circuit breakers respectively through the rated current ratio of the current transformer to be detected, the circuit breakers are controlled to be closed and opened to control detection loops with different current ratios formed among the current booster and the standard current transformer, the rapid switching verification loops are realized, the working efficiency is improved, the workload is reduced, and the detection loops are prevented from being manually reconnected when the current ratios are different every time. The device detects conveniently, and easy operation has solved the low and big problem of work load of work efficiency of current examination power transformer.
Description
Technical Field
The invention relates to the technical field of power transformers, in particular to a device and a method for quickly switching and checking primary windings of a power transformer.
Background
In a distribution system of 6kV to 35kV in China, a current transformer is widely applied, whether the accuracy level of the current transformer is qualified or not has a great relation with both parties of electric power trade settlement, so that the current transformer is very important for factory verification of a high-voltage current transformer and purchasing and warehousing verification of an electric power company, the current transformer needs to be installed and used after being qualified through verification, and the method adopted in the verification process is mainly based on two verification rules of JJG313-2010 current transformer for measurement and JG1021-2007 electric power transformer.
In a power distribution system, a difference method is adopted for testing a current transformer, and the condition is that a standard current transformer and the tested current transformer have the same current ratio. Since the primary current of the standard current transformer is relatively large, for example, the current transformer to be tested is 200A/5A, the standard current transformer also needs to have a current ratio of 200A/5A, and even though the high-voltage current transformer installed in power installation generally adopts the national recommended primary current ratio, the primary current ratio is also large, and the primary current values of the high-voltage current transformers of 10kV are commonly 10A, 20A, 30A, 40A, 50A, 80A, 100A, 150A, 200A, 300A, 400A, 500A, and 600A. Therefore, the current transformers need to be calibrated by the standard current transformers with the current ratios, when the current transformers to be detected with different rated current ratios are calibrated, the primary winding wiring of the standard current transformer and the primary winding wiring of the current booster need to be manually replaced, the workload of wire replacement is large, and the working efficiency is low; and the influence quantity test on the current transformer error is carried out under the condition of high voltage for the high-voltage current transformer, so that the primary winding is in a high-voltage state, a primary loop needs to be subjected to insulation treatment, and otherwise, the risk of voltage breakdown is caused under the high-voltage state of the primary loop.
Therefore, in view of the above situation, how to improve the verification efficiency of the power transformer and reduce the workload becomes an important technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a device and a method for quickly switching and checking primary windings of a power transformer, which are used for solving the technical problems of low working efficiency and large workload of the conventional power transformer calibration.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a power transformer primary winding fast switching calibration device comprises a large current booster, a standard current transformer, a current transformer to be tested and at least 5 circuit breakers;
the high-current booster is used for being connected with a voltage source and respectively connected with the standard current transformer and the circuit breaker;
the standard current transformer is used for being connected with the circuit breaker and the transformer tester respectively;
the detected current transformer is used for being connected with the current load box, the circuit breaker and the transformer detector respectively;
the circuit breaker is used for controlling whether the detected current transformer is connected with the standard current transformer and the large-current booster respectively.
Preferably, the input end of the large-current booster is connected with the voltage source, and the output end of the large-current booster is provided with at least 6 first output connection ends;
the currents output by the 5 first output connecting ends are respectively 600A, 200A, 75A, 40A and 20A.
Preferably, at least 6 primary winding connection ends and 6 secondary winding connection ends are arranged on the standard current transformer.
Preferably, the current transformer to be tested is provided with a primary winding input connection end and a secondary winding output connection end, one primary winding input connection end of the current transformer to be tested is connected with one contact connection end of the circuit breaker, and the primary winding input connection end of the other current transformer to be tested is connected with the other contact connection end of the circuit breaker;
and one secondary winding output connecting end of the detected current transformer is respectively connected with the output ends of the transformer detector and the standard current transformer, and the other secondary winding output connecting end of the detected current transformer is connected with the transformer detector after being connected with the current load box in series.
Preferably, each circuit breaker is provided with at least four contact connecting ends, and the four contact connecting ends are a first contact connecting end, a second contact connecting end, a third contact connecting end and a fourth contact connecting end respectively;
the first contact connecting end is used for being connected with the input connecting end of the standard current transformer;
the second contact connecting end is used for being connected with the output connecting end of the high-current booster;
the third contact connecting end is used for being connected with one primary winding input connecting end of the current transformer to be detected;
the fourth contact connecting end is used for being connected with the primary winding input connecting end of the other current transformer to be detected;
the third contact connecting ends of the 5 circuit breakers are all connected with a first conductive piece, and the first conductive piece is connected with one primary winding input connecting end of the current transformer to be detected; the fourth contact connecting ends of the 5 circuit breakers are all connected with a second conductive piece, and the second conductive piece is connected with the primary winding input connecting end of the other detected current transformer; the first contact connecting ends of the 5 circuit breakers are respectively connected with 5 input ends of the standard current transformer; and the second contact connecting ends of the 5 circuit breakers are respectively connected with 5 output ends of the high-current booster.
Preferably, each contact connecting end comprises two contacts, and the two contacts are connected in parallel and are short-circuited through a conducting strip.
Preferably, the electronic devices of the large-current booster, the standard current transformer, the current transformer to be detected and the 5 circuit breakers are connected through high-voltage cables.
Preferably, 5 of the circuit breakers are fixedly mounted on the insulating support. Wherein, the circuit breaker is a manual circuit breaker.
The invention also provides a method for quickly switching and checking the primary winding of the power transformer, which is used for the device for quickly switching and checking the primary winding of the power transformer and comprises the following steps:
connecting electronic devices such as a large-current booster, a standard current transformer, a current transformer to be detected and at least 5 circuit breakers according to the power transformer primary winding fast switching calibration device through a high-voltage cable;
when a current ratio of the current transformer to be detected needs to be verified, the circuit breakers of the specifications corresponding to the current ratio are closed, and other circuit breakers are opened.
According to the technical scheme, the embodiment of the invention has the following advantages:
1. this electric power mutual-inductor primary winding fast switch over calibration equipment receives its primary winding input connection end respectively through a plurality of circuit breakers to the different wiring link of heavy current rising ware and standard current transformer through the rated current ratio of the current transformer of being examined, adopt the closure and the disconnection of control circuit breaker to control the current transformer of being examined, constitute the detection return circuit of different current ratios between current rising ware and the standard current transformer, realize fast switch over examination return circuit, improve work efficiency, reduce work load, avoid the current different current ratios of every detection and all need artifical reconnection detection return circuit. The power transformer primary winding fast switching calibration device is convenient and fast to detect, simple to operate and capable of solving the problems that the existing power transformer calibration device is low in working efficiency and large in workload. The power transformer primary winding rapid switching calibration device is also suitable for calibrating large-batch current transformers to be tested, and the device is adopted only for replacing the current transformers to be tested, so that the working efficiency of calibrating the current transformers to be tested is improved;
2. according to the method for quickly switching and checking the primary winding of the power transformer, the primary winding input connecting end of the current transformer to be checked is connected to different wiring connecting ends of a large-current booster and a standard current transformer through a plurality of circuit breakers respectively according to the rated current ratio of the current transformer to be checked, detection loops with different current ratios are formed between the current transformer to be checked and the current booster and between the current transformer to be checked and the standard current transformer by controlling the circuit breakers to be closed and opened, the quick switching and checking loops are achieved, the working efficiency is improved, the workload is reduced, the problem that the detection loops are required to be manually reconnected when the different current ratios are detected every time is solved, and the problems that the working efficiency of the.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a circuit diagram of a primary detection circuit of a primary winding fast switching verification apparatus of a power transformer according to an embodiment of the present invention.
Fig. 2 is a frame diagram of a circuit breaker connection of a primary winding fast switching verification device of a power transformer according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating steps of a method for fast switching and verifying a primary winding of a power transformer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides a device and a method for quickly switching and checking primary windings of a power transformer, which are used for solving the technical problems of low working efficiency and large workload of the conventional power transformer calibration. In this embodiment, a current transformer is taken as a case-taking illustration, and other power transformers are also applicable to the scheme described in the embodiment of the present application.
The current transformer is verified according to two verification regulations of JJG313-2010 current transformer for measurement and JJG1021-2007 power transformer, and the current transformer needs to be detected sequentially by adopting a plurality of current ratios.
The existing calibrating device for the current transformer is characterized in that an operator manually connects a primary winding of a standard current transformer with a primary winding of a current booster, and when a current ratio of a current transformer to be detected is detected, the operator manually replaces the connection of the primary winding of the standard current transformer and the primary winding of the current booster, so that the detection mode has large workload of wire replacement and low working efficiency; and the high-voltage current transformer needs to be subjected to a high-voltage influence quantity test on the error of the current transformer, so that the adopted standard current transformer and the current booster need to be a high-voltage standard current transformer and a high-voltage current booster, and the primary winding also needs to be in a high-voltage state, so that the detection loop needs to be subjected to insulation treatment, the detection cost is increased, otherwise, the detection loop is in danger of voltage breakdown in the high-voltage state.
The embodiment of the invention provides a quick switching and checking device for a primary winding of a power transformer, which is applied to checking of a high-voltage current transformer used in a 6 kV-35 kV power distribution network. Fig. 1 is a circuit diagram of a primary detection circuit of a power transformer primary winding fast switching verification device according to an embodiment of the present invention, and fig. 2 is a frame diagram of a circuit breaker connection of the power transformer primary winding fast switching verification device according to the embodiment of the present invention.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a power transformer primary winding fast switching verification apparatus, including a large current booster T1, a standard current transformer CTo, a current transformer to be detected CTx, a current load box Z, a transformer verifier, and at least 5 circuit breakers DLQ HE;
the high current booster T1 is used for connection to a voltage source and to a standard current transformer CTo and a circuit breaker DLQ, respectively.
The voltage of the voltage source is preferably 0 to 250V. The high-current booster T1 is tested in electrical equipment according to power departments and industrial and mining enterprises, such as: the special equipment is specially designed and manufactured for current load test and temperature rise test of various switches, current transformers and other electrical equipment.
The standard current transformer CTo is used for being connected with the circuit breaker DLQ and the transformer tester HE respectively.
It should be noted that the standard current transformer CTo is mainly used as a current transformer calibration standard in an error test of the transformer. The standard current transformer CTo is mainly composed of a primary coil, a secondary coil, an iron core, an insulating support, and a connecting end for outgoing lines. Wherein the primary coil is used for input and the secondary coil is used for output.
And the current transformer CTx to be detected is used for being respectively connected with the current load box Z, the circuit breaker DLQ and the transformer tester HE.
Note that the current transformer CTx to be tested needs a current transformer to be verified. The current transformer CTx to be detected is mainly composed of a primary winding, a secondary winding, an iron core, an insulating support, a connecting end for outgoing lines and the like. Wherein, the primary winding is used for inputting, and the secondary winding is used for outputting. In this embodiment, the outgoing line connection terminal of the primary winding of the current transformer CTx to be detected is denoted as a primary winding input connection terminal, the outgoing line connection terminal of the secondary winding is denoted as a secondary winding output connection terminal, and the current transformer CTx to be detected is provided with two primary winding input connection terminals and two secondary winding output connection terminals, which are respectively a first primary winding input connection terminal P1, a second primary winding input connection terminal P2, a first secondary winding output connection terminal S1, and a second secondary winding output connection terminal S2.
In the embodiment of the present invention, the circuit breaker DLQ is mainly used to control whether the connection end of the primary winding of the current transformer CTx to be tested is connected to the standard current transformer CTo and the high-current step-up transformer T1, respectively. At least four contact connecting ends are arranged on each circuit breaker DLQ, and the four contact connecting ends are respectively a first contact connecting end, a second contact connecting end, a third contact connecting end and a fourth contact connecting end. Specifically, when the input connection end of the primary winding of the current transformer CTx to be tested is connected to the third contact connection end and the fourth contact connection end of each breaker DQL, the first contact connection ends of 5 breakers DQL are connected to the 5 input connection ends of the standard current transformer CTo in a one-to-one correspondence manner, and the second contact connection ends of 5 breakers DQL are connected to the 5 output connection ends of the large-current step-up transformer T1 in a one-to-one correspondence manner; when one of the circuit breakers DLQ is in an on state, the other circuit breakers DLQ are in an off state, so that the current transformer CTx to be detected, the standard current transformer CTo and the high-current booster T1 form a detection loop of a primary current ratio. Because the currents output by the 5 output connecting ends of each large-current booster T1 are different, when the current transformer CTx to be detected needs to be detected under the condition of different current ratios, the current transformer CTx to be detected can be detected by switching on or off the 5 circuit breakers DLQ, and the verification of a plurality of current ratios can be realized, so that the detection is convenient and fast.
The circuit breaker DLQ is a switching device capable of closing, carrying, and opening a current under a normal circuit condition and closing, carrying, and opening a current under an abnormal circuit condition for a predetermined time.
In the embodiment of the present invention, the current load box Z is various kinds of payload specially provided when the current and voltage transformers are tested, and is used for providing a specified rated load and a lower limit load (or called light load) to the current transformer CTx to be tested when the current transformer is tested, and the Z rated load of the current load box is represented by its apparent power at the rated current.
In the embodiment of the invention, the mutual inductor detector HE is a special instrument which is specially used for testing mutual inductors and detecting the ratio error and the angle error of the mutual inductors. During the experiment, the ratio error and the angle error between the standard mutual inductor and the tested mutual inductor are measured, and the test data can be uploaded to a computer for editing, storing or printing.
The primary winding fast switching calibration device of the power transformer provided by the invention has the advantages that the primary winding input connecting end of the current transformer to be tested is respectively connected to different wiring connecting ends of a large current booster and a standard current transformer through a plurality of circuit breakers according to the current ratio of the current transformer to be tested, detection loops with different current ratios are formed among the current transformer to be tested, the current booster and the standard current transformer by controlling the on and off of the circuit breakers, the fast switching calibration loops are realized, the working efficiency is improved, the workload is reduced, and the situation that the detection loops are required to be manually reconnected when different current ratios are detected every time is avoided. The power transformer primary winding fast switching calibration device is convenient and fast to detect, simple to operate and capable of solving the problems that the existing power transformer calibration device is low in working efficiency and large in workload. The power transformer primary winding rapid switching calibration device is also suitable for calibrating large-batch current transformers to be tested, and the device is adopted only for replacing the current transformers to be tested, so that the working efficiency of calibrating the current transformers to be tested is improved.
In one embodiment of the present invention, the input terminal of the high current booster T1 is connected to a voltage source, and the output terminal of the high current booster T1 is provided with at least 6 first output connection terminals. The currents output by the 5 first output connecting ends are respectively 600A, 200A, 75A, 40A and 20A.
The primary output terminal of the large current booster T1 is selected according to the rated current ratio of the current transformer CTx to be tested.
In one embodiment of the present invention, at least 6 primary and secondary winding connections are provided on a standard current transformer CTo.
The number of primary winding connection terminals and secondary winding connection terminals provided in the standard current transformer CTo is set according to the rated current ratio of the current transformer CTx to be tested. Specifically, in the present embodiment, the 6 primary winding connection ends of the standard current transformer CTo are respectively denoted as L1, L2, L3, L4, L5, and L6; the 6 secondary winding connections of the standard current transformer CTo are denoted K1, K2, K3, K4, K5 and L6, respectively.
In one embodiment of the invention, the first primary winding input connection end P1 of the current transformer CTx to be tested is connected with the third contact connection end of the circuit breaker DLQ, and the second primary winding input connection end P2 of the current transformer CTx to be tested is connected with the fourth contact connection end of the circuit breaker DLQ; and a first secondary winding output connecting end S1 of the current transformer CTx to be detected is connected with a transformer detector HE and a secondary winding connecting end K1 of a standard current transformer CTo, and a second secondary winding output connecting end S2 of the current transformer CTx to be detected is connected with a current load box Z in series and then is connected with the transformer detector HE.
In one embodiment of the present invention, the third contact connection terminals of the 5 circuit breakers DLQ are all connected to a first conductive member, which is connected to the first primary winding input connection terminal P1 of the current detecting transformer CTx; the fourth contact connecting ends of the 5 circuit breakers DLQ are all connected with a second conductive piece, and the second conductive piece is connected with a second primary winding input connecting end P2 of the current transformer CTx to be detected; first contact connection ends of the 5 circuit breakers DLQ are respectively connected with 5 primary winding connection ends L1, L2, L3, L4 and L5 of the standard current transformer CTo; the second contact terminals of the 5 circuit breakers DLQ are connected to the 5 first output terminals 600A, 200A, 75A, 40A, 20A of the high-current step-up converter T1, respectively.
In one embodiment of the invention, each contact connection on the DLQ includes two contacts that are shorted in parallel by a conductive strip.
It should be noted that, two contacts are connected in parallel through a conducting strip for short circuit, and a circuit breaker with a rated current of half of the test current can be adopted. Because the common three-phase circuit breaker can only provide three loops, each circuit breaker needs to switch a primary winding of a standard current transformer CTo and a winding of a high-current booster T1, only two contact connecting ends are used, and one loop is wasted; meanwhile, the rated current of the contact connection end must be matched with the maximum winding current of the high-current booster T1, for example, the maximum rated current of the L5 winding of the standard current transformer CTo is 600A, a breaker with the rated current of 600A is needed, the winding of the high-current booster T1 matched with the breaker is T1_600A, and the breaker with the rated current of 600A is also needed, so that the cost is high; and one of the contact connecting ends is unused and wasted. In the invention, 2 contacts of the circuit breaker DLQ adopting 4 contact connecting ends can be connected in parallel with a winding L5 of a standard current transformer CTo, and the other two contacts are connected in parallel with a T1_600A of a high-current booster T1, so that the maximum current test requirement of the winding can be met by selecting the circuit breaker DLQ with the rated current of 300A; meanwhile, the cost of the circuit breaker can be reduced, the 600A circuit breaker is more than 1 time more expensive than the 300A circuit breaker, the 600A circuit breaker is larger in size, and the occupied installation area of the device is large. In this embodiment, the 5 breaker DLQs are selected as 300A breaker DLQ, 100A1 breaker DLQ, 100A2 breaker DLQ, 100A3 breaker DLQ, and 100A4 breaker DLQ, respectively. The 300A circuit breaker DLQ with a single contact rated current of 300A can work through 600A current by using a contact connecting end of a parallel short double contact, and can be connected with an electronic device with 300A, 400A, 500A or 600A rated current. The 100A1 circuit breaker DLQ, with a single contact rated current of 100A, can be connected to 200A, 150A or 100A rated current electronics using a parallel shorted dual contact terminal to operate through 200A current. The 100A2 circuit breaker DLQ, with a single contact rated current of 100A, can be connected to 75A or 50A rated current electronics using a parallel shorted dual contact terminal operating through 200A current. The 100A3 circuit breaker DLQ, with a single contact rated current of 100A, can be connected to 40A or 30A rated current electronics using a parallel shorted dual contact terminal operating through 200A current. The 100A4 circuit breaker DLQ, with a single contact rated current of 100A, can be connected to 20A, 15A or 10A rated current electronics using a parallel shorted dual contact terminal operating through 200A current.
In one embodiment of the present invention, the conductive strips may be terminal copper bars.
In an embodiment of the present invention, the electronic devices, i.e., the high-current booster T1, the standard current transformer CTo, the current transformer CTx to be tested, the current load box Z, the transformer checker HE, and the 5 circuit breakers DLQ, are connected through a high-voltage cable.
It should be noted that the high-voltage cable may be a 35kV flexible high-voltage cable. The insulated high-voltage cable is used as a connecting wire, so that the high-voltage cable can bear high voltage while bearing excessive current, and can be used for a floor mopping test. The high-voltage cable can be placed in the air through the insulating support without the need of suspending the cable like a common cable in a high-voltage test, and the high-voltage cable can be placed at any position and on the ground at will without worrying about the problem of high-voltage breakdown.
In one embodiment of the invention, 5 circuit breakers DLQ are all fixedly mounted on an insulating support. Wherein, the insulating support is made of insulating epoxy material. The circuit breaker DLQ can be switched on or off by manually stirring the handle through the through hole.
It should be noted that, the work of the DLQ circuit breaker provided in this embodiment is realized by the coordination control of the controller, and the control device may be a technology that is mature and formed by a PLC controller, a computer, or a single chip microcomputer, and the structure of the control device is not further described because the control device is not an improvement point of this embodiment.
In one embodiment of the present invention, the 5 circuit breakers DLQ are each preferably manual low voltage circuit breakers.
It should be noted that one of the low-voltage circuit breakers is selected because all the DLQs are on the insulating support for insulating the high voltage, and the 10kV high voltage on the DLQ contact of the circuit breaker is insulated from the outside through the insulating support, so that the DLQ does not need to have an insulating requirement on the ground. Secondly, the highest breakpoint voltage at two sides of the DLQ contact of the circuit breaker is the output voltage of the current booster (the maximum output voltage of the large-current booster T1 used in the invention is 30V) and is smaller than the requirement of the contact cut-off voltage (generally 600V) of the low-voltage circuit breaker, so that the operating requirement can be met.
In the fast switching calibration apparatus for a primary winding of a power transformer provided by the embodiment of the present invention, the operation mode of the current transformer CTx to be tested is fast switched and calibrated, for example: if the current ratio of the tested current transformer is verified to be 75A/5A, the 100A2 circuit breaker DLQ needs to be closed, and the other 4 circuit breakers DLQ are all opened, then the tested current transformer CTx with the current ratio of 75A/5A needs to be switched to for verifying one current ratio of the tested current transformer CTx with the current ratio of 300A/5A, at the moment, only the 100A2 circuit breaker DLQ needs to be opened, then the 300A circuit breaker DLQ is closed, the current ratio of 300A/5A can be verified for the tested current transformer CTx, and the primary winding of the standard current transformer CTo and the large-current booster T1 is rapidly switched. The power transformer primary winding fast switching calibration device is simple and convenient to operate, and the calibration work efficiency of a plurality of current ratios is high.
Example two:
fig. 3 is a flowchart illustrating steps of a method for fast switching and verifying a primary winding of a power transformer according to an embodiment of the present invention.
As shown in fig. 2 and fig. 3, an embodiment of the present invention provides a method for fast switching and verifying a primary winding of a power transformer, which is used for the device for fast switching and verifying a primary winding of a power transformer, and includes the following steps:
100, connecting electronic devices such as a large-current booster T1, a standard current transformer CTo, a current transformer to be detected CTx, a current load box Z, a transformer calibrator HE and at least 5 circuit breakers DLQ through a high-voltage cable according to the power transformer primary winding quick switching calibration device;
and 200, when a current ratio of the current transformer CTx to be detected needs to be verified, closing the circuit breaker DLQ with the specification corresponding to the current ratio, and opening other circuit breakers DLQ.
In one embodiment provided by the invention, 5 circuit breakers DLQ with 4 contact connecting ends are mounted on an insulating support, so that the withstand voltage to the ground on the circuit breakers DLQ can reach 35 kV. A wiring group corresponding to a primary winding connecting end L1-L5 of a standard current transformer CTo is connected to a contact A1 and a contact A2 of a corresponding DLQ circuit breaker by adopting 35kV soft high-voltage cables, wherein the contact A1 and the contact A2 are in short circuit by adopting short circuit conducting strips (terminal copper bars). And then, connecting the wiring groups corresponding to 20A, 40A, 75A, 200A and 600A of the high-current booster T1 to a contact A3 and a contact A4 of a DLQ (direct current) circuit breaker by using a 35kV soft high-voltage cable, wherein the contact A3 and the contact A4 are shorted by using short-circuit conducting strips (terminal copper bars). And a contact B1 and a contact B2 of 5 DLQ breakers are welded on a first conductive piece after short circuit by adopting a short circuit conductive piece (a terminal copper bar), and the first conductive piece is connected to a first primary winding input connecting end P1 of the current transformer CTx to be detected through a 10kV high-voltage cable. And a contact B3 and a contact B4 of 5 DLQ breakers are welded on a second conductive piece after short circuit by adopting a short circuit conductive piece (a terminal copper bar), and the second conductive piece is connected to a second primary winding input connecting end P2 of the current transformer CTx to be detected through a 10kV high-voltage cable.
According to the method for quickly switching and checking the primary windings of the power transformer, the primary winding input connection end of the current transformer to be checked is connected to different wiring connection ends of a large-current booster and a standard current transformer through a plurality of circuit breakers respectively according to the rated current ratio of the current transformer to be checked, detection loops with different current ratios are formed between the current transformer to be checked and the current booster and between the current transformer to be checked and the standard current transformer by controlling the circuit breakers to be closed and opened, the quick switching and checking of the loops are achieved, the working efficiency is improved, the workload is reduced, the problem that the detection loops are required to be manually reconnected when the different current ratios are detected every time is solved, and the problems that the existing.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a power transformer primary winding fast switch over calibration equipment which characterized in that, includes heavy current rising ware, standard current transformer, the current transformer of being examined, current load case, mutual-inductor check gauge and 5 at least circuit breakers:
the high-current booster is used for being connected with a voltage source and respectively connected with the standard current transformer and the circuit breaker;
the standard current transformer is used for being connected with the circuit breaker and the transformer tester respectively;
the detected current transformer is used for being connected with the current load box, the circuit breaker and the transformer detector respectively;
the circuit breaker is used for controlling whether the detected current transformer is connected with the standard current transformer and the large-current booster respectively.
2. The power transformer primary winding fast switching verification device according to claim 1, wherein an input end of the high-current booster is connected with the voltage source, and an output end of the high-current booster is provided with at least 6 first output connection ends;
the currents output by the 5 first output connecting ends are respectively 600A, 200A, 75A, 40A and 20A.
3. The power transformer primary winding fast switching verification device according to claim 1, wherein at least 6 primary winding connection terminals and 6 secondary winding connection terminals are provided on the standard current transformer.
4. The power transformer primary winding fast switching verification device according to claim 1, wherein a primary winding input connection end and a secondary winding output connection end are arranged on the current transformer to be tested, one primary winding input connection end of the current transformer to be tested is connected with one contact connection end of the circuit breaker, and a primary winding input connection end of the other current transformer to be tested is connected with the other contact connection end of the circuit breaker;
and one secondary winding output connecting end of the detected current transformer is respectively connected with the output ends of the transformer detector and the standard current transformer, and the other secondary winding output connecting end of the detected current transformer is connected with the transformer detector after being connected with the current load box in series.
5. The power transformer primary winding fast switching verification device according to claim 1, wherein each of the circuit breakers is provided with at least four contact connection ends, the four contact connection ends being a first contact connection end, a second contact connection end, a third contact connection end and a fourth contact connection end;
the first contact connecting end is used for being connected with the input connecting end of the standard current transformer;
the second contact connecting end is used for being connected with the output connecting end of the high-current booster;
the third contact connecting end is used for being connected with one primary winding input connecting end of the current transformer to be detected;
the fourth contact connecting end is used for being connected with the primary winding input connecting end of the other current transformer to be detected;
the third contact connecting ends of the 5 circuit breakers are all connected with a first conductive piece, and the first conductive piece is connected with one primary winding input connecting end of the current transformer to be detected; the fourth contact connecting ends of the 5 circuit breakers are all connected with a second conductive piece, and the second conductive piece is connected with the primary winding input connecting end of the other detected current transformer; the first contact connecting ends of the 5 circuit breakers are respectively connected with 5 input ends of the standard current transformer; and the second contact connecting ends of the 5 circuit breakers are respectively connected with 5 output ends of the high-current booster.
6. The power transformer primary winding fast switching verification device as claimed in claim 5, wherein each said contact connection end includes two contacts, and two said contacts are short-circuited in parallel through a conducting strip.
7. The power transformer primary winding fast switching verification apparatus according to claim 1, wherein the electronic devices of the high current booster, the standard current transformer, the current transformer to be tested and 5 circuit breakers are connected through high voltage cables.
8. The power transformer primary winding fast switching verification device according to claim 1, wherein 5 said circuit breakers are fixedly mounted on an insulating support.
9. The power transformer primary winding fast switching verification device of claim 1, wherein the circuit breaker is a manual circuit breaker.
10. A power transformer primary winding fast switching verification method, which is used for the power transformer primary winding fast switching verification device according to any one of claims 1 to 9, and comprises the following steps:
connecting electronic devices such as a high-current booster, a standard current transformer, a current transformer to be detected and at least 5 circuit breakers through a high-voltage cable according to the power transformer primary winding quick switching verification device as claimed in any one of claims 1 to 9;
when a current ratio of the current transformer to be detected needs to be verified, the circuit breakers of the specifications corresponding to the current ratio are closed, and other circuit breakers are opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010062347.4A CN111157941A (en) | 2020-01-19 | 2020-01-19 | Device and method for quickly switching and checking primary winding of power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010062347.4A CN111157941A (en) | 2020-01-19 | 2020-01-19 | Device and method for quickly switching and checking primary winding of power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111157941A true CN111157941A (en) | 2020-05-15 |
Family
ID=70564232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010062347.4A Pending CN111157941A (en) | 2020-01-19 | 2020-01-19 | Device and method for quickly switching and checking primary winding of power transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111157941A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693925A (en) * | 2020-07-20 | 2020-09-22 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Current transformer detection operation platform and multi-position top-speed current transformer calibration system |
| CN111781552A (en) * | 2020-08-07 | 2020-10-16 | 国网四川省电力公司电力科学研究院 | Relay parallel device, and automatic current transformer range conversion device and method |
| CN113655428A (en) * | 2021-09-06 | 2021-11-16 | 国家电网有限公司 | Automatic verification system based on standard current transformer |
| CN115308666A (en) * | 2021-12-13 | 2022-11-08 | 中国电力科学研究院有限公司 | Device and method for measuring error of wide-range current transformer |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4425596A (en) * | 1980-09-26 | 1984-01-10 | Tokyo Shibaura Denki Kabushiki Kaisha | Electric circuit breaker |
| CN101041339A (en) * | 2006-03-23 | 2007-09-26 | 丁靖 | Protecting device for self-burning of vehicle |
| CN205211582U (en) * | 2015-10-26 | 2016-05-04 | 常州欧瑞电气有限公司 | Intelligence current transformer for circuit breaker |
| CN105762038A (en) * | 2016-04-29 | 2016-07-13 | 首瑞（天津）电气设备有限公司 | Circuit breaker contact system and circuit breaker |
| CN208656408U (en) * | 2018-08-17 | 2019-03-26 | 中广核工程有限公司 | A kind of portable protective relaying device |
| CN109738850A (en) * | 2019-03-11 | 2019-05-10 | 广东电网有限责任公司 | A kind of electric energy measuring equipment calibrating installation based on the switching of multi-standard table |
| CN109856586A (en) * | 2019-03-08 | 2019-06-07 | 国网江苏省电力有限公司电力科学研究院 | A kind of current lifting device and preparation method thereof and the method for inspection |
| CN211826457U (en) * | 2020-01-19 | 2020-10-30 | 广东电网有限责任公司计量中心 | Quick switching calibration device for primary winding of power transformer |
-
2020
- 2020-01-19 CN CN202010062347.4A patent/CN111157941A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4425596A (en) * | 1980-09-26 | 1984-01-10 | Tokyo Shibaura Denki Kabushiki Kaisha | Electric circuit breaker |
| CN101041339A (en) * | 2006-03-23 | 2007-09-26 | 丁靖 | Protecting device for self-burning of vehicle |
| CN205211582U (en) * | 2015-10-26 | 2016-05-04 | 常州欧瑞电气有限公司 | Intelligence current transformer for circuit breaker |
| CN105762038A (en) * | 2016-04-29 | 2016-07-13 | 首瑞（天津）电气设备有限公司 | Circuit breaker contact system and circuit breaker |
| CN208656408U (en) * | 2018-08-17 | 2019-03-26 | 中广核工程有限公司 | A kind of portable protective relaying device |
| CN109856586A (en) * | 2019-03-08 | 2019-06-07 | 国网江苏省电力有限公司电力科学研究院 | A kind of current lifting device and preparation method thereof and the method for inspection |
| CN109738850A (en) * | 2019-03-11 | 2019-05-10 | 广东电网有限责任公司 | A kind of electric energy measuring equipment calibrating installation based on the switching of multi-standard table |
| CN211826457U (en) * | 2020-01-19 | 2020-10-30 | 广东电网有限责任公司计量中心 | Quick switching calibration device for primary winding of power transformer |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693925A (en) * | 2020-07-20 | 2020-09-22 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Current transformer detection operation platform and multi-position top-speed current transformer calibration system |
| CN111693925B (en) * | 2020-07-20 | 2023-01-03 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Current transformer detection operation platform and multi-position top-speed current transformer calibration system |
| CN111781552A (en) * | 2020-08-07 | 2020-10-16 | 国网四川省电力公司电力科学研究院 | Relay parallel device, and automatic current transformer range conversion device and method |
| CN113655428A (en) * | 2021-09-06 | 2021-11-16 | 国家电网有限公司 | Automatic verification system based on standard current transformer |
| CN115308666A (en) * | 2021-12-13 | 2022-11-08 | 中国电力科学研究院有限公司 | Device and method for measuring error of wide-range current transformer |
| CN115308666B (en) * | 2021-12-13 | 2024-05-17 | 中国电力科学研究院有限公司 | Device and method for measuring error of wide-range current transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111157941A (en) | Device and method for quickly switching and checking primary winding of power transformer | |
| CN108680772B (en) | Secondary test interface device of high-voltage circuit breaker and test method thereof | |
| CN211826457U (en) | Quick switching calibration device for primary winding of power transformer | |
| CN109142881A (en) | Intelligent switching wire device for electrical test of power transformer | |
| CN219458917U (en) | Power supply device for calibrating DC arc welding electromechanical parameter detection equipment | |
| CN218896185U (en) | Auxiliary device for voltage transformer test | |
| CN208689112U (en) | Intelligent switching wire device for electrical test of power transformer | |
| RU2095820C1 (en) | Device which tests electric drive | |
| Palmer-Buckle et al. | Characteristics of transformer parameters during internal winding faults based on experimental measurements | |
| CN216082927U (en) | Resistance measuring device suitable for circuit breaker or isolating switch under high electric field intensity | |
| CN113410035B (en) | Anti-resonance voltage transformer with grounding compensation function based on Y-shaped wiring | |
| CN114113821B (en) | Wiring identification method for incoming line current transformer of bus differential protection device | |
| CN113156276B (en) | Method for checking and debugging secondary voltage loop of bus alternating-current withstand voltage test of switching equipment | |
| CN113640734A (en) | Current automatic switching device and high-voltage electric energy metering equipment inspection device | |
| Dai et al. | Research on Fault Diagnosis and Analysis Method of Converter Transformer | |
| CN111751715A (en) | Be applied to primary loop detection device of circuit breaker | |
| CN111458565A (en) | Medium loss and insulation resistance test conversion device | |
| Wang et al. | Transformer models for detection of incipient internal winding faults | |
| Denissov et al. | Integrated test van for maintenance and diagnosis of power transformers | |
| CN217820805U (en) | Mutual inductor automatic switching type winding voltage withstanding test system | |
| CN220401113U (en) | Intelligent multi-channel output power distribution system | |
| Dupuis | An introduction to electrical diagnostic testing of power transformers | |
| CN114859186B (en) | Device and method for rapidly measuring minimum dielectric strength margin | |
| CN216670198U (en) | Simulation circuit breaker for electrical test | |
| CN219829960U (en) | Test system for gas-insulated switchgear |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |