CN207650278U - The special phase changer of direct-current resistance tester for transformer - Google Patents

The special phase changer of direct-current resistance tester for transformer Download PDF

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Publication number
CN207650278U
CN207650278U CN201721854236.7U CN201721854236U CN207650278U CN 207650278 U CN207650278 U CN 207650278U CN 201721854236 U CN201721854236 U CN 201721854236U CN 207650278 U CN207650278 U CN 207650278U
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China
Prior art keywords
relay
resistance
connection
transformer
power supply
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CN201721854236.7U
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Inventor
付玉婷
田忠
张昕
吴卫
黄家铭
谢祥伟
曹礼南
戴迪
宁晗
方苇
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State Grid Corp of China SGCC
Maintenance Branch of State Grid Hubei Electric Power Co Ltd
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State Grid Corp of China SGCC
Maintenance Branch of State Grid Hubei Electric Power Co Ltd
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Abstract

The utility model is related to a kind of special phase changers of direct-current resistance tester for transformer, it is characterised in that:It includes MOS1 pipes~MOS6 pipes, resistance R1~resistance R6, resistance R1'~resistance R6', capacitance C1~capacitance C6, relay A1~relay A6, DC power supply DC1 and DC power supply DC2.The utility model can a key replace test connection, and at the same time discharging preceding test phase winding, and charge to existing test phase winding.It compared with manually replacing test connection, is operated using professional phase changer, has both saved the time of each electric discharge and replacement test connection, also reduced the workload of testing crew.

Description

The special phase changer of direct-current resistance tester for transformer
Technical field
The utility model is related to high voltage electric equipment technical fields, and in particular to a kind of direct-current resistance tester for transformer is special Use phase changer.
Background technology
In power transmission and transformation equipment state overhauling testing regulations, DC Resistance Test of Transformer is that state's network planning determines power transformer Essential one in experiment, by for many years to the research and development of instrument for measuring DC resistance, now mainly have three-phase tester and Two kinds of single-phase tester.The former is served only for the experiment of three-phase transformer direct current resistance m easurem ent, and the latter can be used to single-phase transformer D.C. resistance is tested, it can also be used to which three-phase transformer D.C. resistance is tested, and small volume is easy to carry, therefore in electrical test In obtained wider application.
But if by single-phase tester for three-phase transformer direct current resistance m easurem ent test, testing crew can only gradually to A, B, C phase windings measure.Each commutation first discharges preceding test phase winding, then replaces test connection, then to existing test Phase winding charges.Due to all at least 17 grades taps of the high-pressure side winding of 110kV and above three-phase transformer Switch position, as carried out three-phase transformer high-pressure side direct current resistance m easurem ent using single-phase tester, commutation works not testing crew It is only very complicated, also waste the plenty of time.
Invention content
The purpose of this utility model is to provide a kind of special phase changers of direct-current resistance tester for transformer, which can One key replaces test connection, and at the same time discharging preceding test phase winding, and charges to existing test phase winding.With people Work replace test connection compare, operated using professional phase changer, both saved it is each electric discharge and replacement test connection when Between, also reduce the workload of testing crew.
In order to solve the above technical problems, the special commutation of a kind of direct-current resistance tester for transformer disclosed by the utility model Device, it is characterised in that:It includes MOS1 pipes~MOS6 pipes, resistance R1~resistance R6, resistance R1'~resistance R6', capacitance C1~electricity Hold C6, relay A1~relay A6, DC power supply DC1 and DC power supply DC2, wherein the normally opened contact k1's of relay A1 One end connects the anode of DC power supply DC1, the cathode of one end connection DC power supply DC1 of resistance R1', the other end of resistance R1' Connect one end of relay A1 normally-closed contacts k1', normally opened the touching of the other end connection relay A1 of relay A1 normally-closed contacts k1' The other end of point k1, one end of the other end connection resistance R1 of the normally opened contact k1 of relay A1, the other end connection of resistance R1 The grid of MOS1 pipes, voltage tester the connecting terminal U, capacitance C1 of the cathode connection commutator transformer neutral conductor of DC power supply DC1 It is connected between the other end of resistance R1 and the cathode of DC power supply DC1, the drain electrode connection DCR of Transformer of MOS1 pipes is surveyed The source electrode connection commutator transformer A phases line voltages for trying voltage tester connecting terminal U, the MOS1 pipe of instrument anode detection mouth test wiring Terminal U;
The anode of one end connection DC power supply DC2 of the normally opened contact k2 of relay A2, one end of resistance R2' connects direct current The cathode of power supply DC2, one end of the other end connection relay A2 normally-closed contacts k2' of resistance R2', relay A2 normally-closed contacts The other end of the normally opened contact k2 of the other end connection relay A2 of k2', the other end connection of the normally opened contact k2 of relay A2 One end of resistance R2, the grid of the other end connection MOS2 pipes of resistance R2, the cathode of DC power supply DC2 connect in commutator transformer The testing current connecting terminal I of property line, capacitance C2 are connected between the other end of resistance R2 and the cathode of DC power supply DC2, The source of testing current connecting terminal I, the MOS2 pipe of the drain electrode connection direct-current resistance tester for transformer anode detection mouth of MOS2 pipes Pole connects commutator transformer A phase line currents test connecting terminal I;
The anode of one end connection DC power supply DC1 of the normally opened contact k3 of relay A3, one end of resistance R3' connects direct current The cathode of power supply DC1, one end of the other end connection relay A3 normally-closed contacts k3' of resistance R3', relay A3 normally-closed contacts The other end of the normally opened contact k3 of the other end connection relay A3 of k3', the other end connection of the normally opened contact k3 of relay A3 One end of resistance R3, the grid of the other end connection MOS3 pipes of resistance R3, capacitance C3 are connected to the other end and direct current of resistance R3 Between the cathode of power supply DC1, the voltage tester of the drain electrode connection direct-current resistance tester for transformer anode detection mouth of MOS3 pipes connects The source electrode connection commutator transformer B phases line voltages test connecting terminal U of line terminals U, MOS1 pipe;
The anode of one end connection DC power supply DC2 of the normally opened contact k4 of relay A4, one end of resistance R4' connects direct current The cathode of power supply DC2, one end of the other end connection relay A4 normally-closed contacts k4' of resistance R4', relay A4 normally-closed contacts The other end of the normally opened contact k4 of the other end connection relay A4 of k4', the other end connection of the normally opened contact k4 of relay A4 One end of resistance R4, the grid of the other end connection MOS4 pipes of resistance R4, capacitance C4 are connected to the other end and direct current of resistance R4 Between the cathode of power supply DC2, the testing current of the drain electrode connection direct-current resistance tester for transformer anode detection mouth of MOS4 pipes connects The source electrode connection commutator transformer B phase line currents test connecting terminal I of line terminals I, MOS4 pipe;
The anode of one end connection DC power supply DC1 of the normally opened contact k5 of relay A5, one end of resistance R5' connects direct current The cathode of power supply DC1, one end of the other end connection relay A5 normally-closed contacts k5' of resistance R5', relay A5 normally-closed contacts The other end of the normally opened contact k5 of the other end connection relay A5 of k5', the other end connection of the normally opened contact k5 of relay A5 One end of resistance R5, the grid of the other end connection MOS5 pipes of resistance R5, capacitance C5 are connected to the other end and direct current of resistance R5 Between the cathode of power supply DC1, the voltage tester of the drain electrode connection direct-current resistance tester for transformer anode detection mouth of MOS5 pipes connects The source electrode connection commutator transformer C phases line voltages test connecting terminal U of line terminals U, MOS5 pipe;
The anode of one end connection DC power supply DC2 of the normally opened contact k6 of relay A6, one end of resistance R6' connects direct current The cathode of power supply DC2, one end of the other end connection relay A6 normally-closed contacts k6' of resistance R6', relay A6 normally-closed contacts The other end of the normally opened contact k6 of the other end connection relay A6 of k6', the other end connection of the normally opened contact k6 of relay A6 One end of resistance R6, the grid of the other end connection MOS6 pipes of resistance R6, capacitance C6 are connected to the other end and direct current of resistance R6 Between the cathode of power supply DC2, the testing current of the drain electrode connection direct-current resistance tester for transformer anode detection mouth of MOS6 pipes connects The source electrode connection commutator transformer C phase line currents test connecting terminal I of line terminals I, MOS6 pipe.
The utility model can a key replace test connection, and at the same time discharge preceding test phase winding, and to existing survey Examination phase winding charges.Compared with manually replacing test connection, is operated using professional phase changer, both saved and put every time Electricity and the time for replacing test connection, also reduce the workload of testing crew.
The utility model is using metal-oxide-semiconductor as the Sofe Switch for measuring major loop, and main there are three advantages:One, metal-oxide-semiconductor is connected Resistance is much smaller relative to DCR of Transformer, and measurement result is not influenced substantially;Two, the metal-oxide-semiconductor in saturation region It is equivalent to a variable resistance, overvoltage can not be will produce by metal-oxide-semiconductor repid discharge by being disconnected winding;Three, switching circuit When, preceding test phase circuit, which is disconnected, to be connected and can be carried out at the same time with now test phase circuit, and the time is saved.
Description of the drawings
Fig. 1 is the structure diagram of the utility model.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
The special phase changer of a kind of direct-current resistance tester for transformer of the utility model, as shown in Figure 1, it includes MOS1 pipes It is~MOS6 pipes, resistance R1~resistance R6, resistance R1'~resistance R6', capacitance C1~capacitance C6, relay A1~relay A6, straight Galvanic electricity source DC1 and DC power supply DC2, wherein the anode of one end connection DC power supply DC1 of the normally opened contact k1 of relay A1, The cathode of one end connection DC power supply DC1 of resistance R1', the one of the other end connection relay A1 normally-closed contacts k1' of resistance R1' End, the other end of the normally opened contact k1 of the other end connection relay A1 of relay A1 normally-closed contacts k1', relay A1's is normally opened One end of the other end connection resistance R1 of contact k1, the grid of the other end connection MOS1 pipes of resistance R1, DC power supply DC1's is negative Voltage tester the connecting terminal U, capacitance C1 of the pole connection commutator transformer neutral conductor are connected to the other end and direct current of resistance R1 Between the cathode of source DC1, the voltage tester of the drain electrode connection direct-current resistance tester for transformer anode detection mouth IN of MOS1 pipes connects The source electrode connection commutator transformer A phases line voltages test connecting terminal U of line terminals U, MOS1 pipe;
The anode of one end connection DC power supply DC2 of the normally opened contact k2 of relay A2, one end of resistance R2' connects direct current The cathode of power supply DC2, one end of the other end connection relay A2 normally-closed contacts k2' of resistance R2', relay A2 normally-closed contacts The other end of the normally opened contact k2 of the other end connection relay A2 of k2', the other end connection of the normally opened contact k2 of relay A2 One end of resistance R2, the grid of the other end connection MOS2 pipes of resistance R2, the cathode of DC power supply DC2 connect in commutator transformer The testing current connecting terminal I of property line, capacitance C2 are connected between the other end of resistance R2 and the cathode of DC power supply DC2, The source of testing current connecting terminal I, the MOS2 pipe of the drain electrode connection direct-current resistance tester for transformer anode detection mouth of MOS2 pipes Pole connects commutator transformer A phase line currents test connecting terminal I;
The anode of one end connection DC power supply DC1 of the normally opened contact k3 of relay A3, one end of resistance R3' connects direct current The cathode of power supply DC1, one end of the other end connection relay A3 normally-closed contacts k3' of resistance R3', relay A3 normally-closed contacts The other end of the normally opened contact k3 of the other end connection relay A3 of k3', the other end connection of the normally opened contact k3 of relay A3 One end of resistance R3, the grid of the other end connection MOS3 pipes of resistance R3, capacitance C3 are connected to the other end and direct current of resistance R3 Between the cathode of power supply DC1, the voltage tester of the drain electrode connection direct-current resistance tester for transformer anode detection mouth of MOS3 pipes connects The source electrode connection commutator transformer B phases line voltages test connecting terminal U of line terminals U, MOS1 pipe;
The anode of one end connection DC power supply DC2 of the normally opened contact k4 of relay A4, one end of resistance R4' connects direct current The cathode of power supply DC2, one end of the other end connection relay A4 normally-closed contacts k4' of resistance R4', relay A4 normally-closed contacts The other end of the normally opened contact k4 of the other end connection relay A4 of k4', the other end connection of the normally opened contact k4 of relay A4 One end of resistance R4, the grid of the other end connection MOS4 pipes of resistance R4, capacitance C4 are connected to the other end and direct current of resistance R4 Between the cathode of power supply DC2, the testing current of the drain electrode connection direct-current resistance tester for transformer anode detection mouth of MOS4 pipes connects The source electrode connection commutator transformer B phase line currents test connecting terminal I of line terminals I, MOS4 pipe;
The anode of one end connection DC power supply DC1 of the normally opened contact k5 of relay A5, one end of resistance R5' connects direct current The cathode of power supply DC1, one end of the other end connection relay A5 normally-closed contacts k5' of resistance R5', relay A5 normally-closed contacts The other end of the normally opened contact k5 of the other end connection relay A5 of k5', the other end connection of the normally opened contact k5 of relay A5 One end of resistance R5, the grid of the other end connection MOS5 pipes of resistance R5, capacitance C5 are connected to the other end and direct current of resistance R5 Between the cathode of power supply DC1, the voltage tester of the drain electrode connection direct-current resistance tester for transformer anode detection mouth of MOS5 pipes connects The source electrode connection commutator transformer C phases line voltages test connecting terminal U of line terminals U, MOS5 pipe;
The anode of one end connection DC power supply DC2 of the normally opened contact k6 of relay A6, one end of resistance R6' connects direct current The cathode of power supply DC2, one end of the other end connection relay A6 normally-closed contacts k6' of resistance R6', relay A6 normally-closed contacts The other end of the normally opened contact k6 of the other end connection relay A6 of k6', the other end connection of the normally opened contact k6 of relay A6 One end of resistance R6, the grid of the other end connection MOS6 pipes of resistance R6, capacitance C6 are connected to the other end and direct current of resistance R6 Between the cathode of power supply DC2, the testing current of the drain electrode connection direct-current resistance tester for transformer anode detection mouth of MOS6 pipes connects The source electrode connection commutator transformer C phase line currents test connecting terminal I of line terminals I, MOS6 pipe.
In above-mentioned technical proposal, the voltage tester terminals U of the cathode detection mouth OUT of direct-current resistance tester for transformer connects Connect the voltage tester connecting terminal U of the commutator transformer neutral conductor, the electricity of the cathode detection mouth OUT of direct-current resistance tester for transformer The testing current connecting terminal I of the current test terminals I connection commutator transformer neutral conductors.
In order to avoid being impacted to double bridge in single-phase tester, voltage MOS1 pipes, MOS3 pipes, MOS5 pipes and electric current MOS2 pipes, MOS4 pipes, MOS6 pipes trigger circuit use DC power supply DC1 and DC2 respectively.
In above-mentioned technical proposal, the DC power supply DC1 is identical as the voltage of DC power supply DC2, DC power supply DC1 with it is straight Galvanic electricity source DC2 mono- provides power supply to voltage circuit, another provides power supply to current loop, and the two is mutually isolated to prevent voltage There is short circuit in measuring loop and current measurement circuit.
In above-mentioned technical proposal, when direct-current resistance tester for transformer will detect commutator transformer A phase lines, relay is controlled Device A1 and control relay A2 are powered, control relay A3, relay A4, relay A5 and relay A6 power-off.
In above-mentioned technical proposal, when direct-current resistance tester for transformer will detect commutator transformer B phase lines, relay is controlled Device A3 and control relay A4 are powered, control relay A1, relay A2, relay A5 and relay A6 power-off.
In above-mentioned technical proposal, when direct-current resistance tester for transformer will detect commutator transformer C phase lines, relay is controlled Device A5 and control relay A6 are powered, control relay A1, relay A2, relay A3 and relay A4 power-off.
In above-mentioned technical proposal, the time constant of C1 chargings is related with R1, and the time constant of C2 chargings is related with R2, determines The conducting speed of MOS1 and MOS2 pipes;The time constant of C1 electric discharges is related with (R1+R1'), the time constant and (R2+ of C2 electric discharges R2') related, determine the turn-off speed of MOS1 pipe and MOS2 pipes.Therefore, when R1 is smaller, the larger (R1*C1=1 of R1';(R1+ R1') when * C1=5), R2 is smaller, the larger (R2*C2=1 of R2';(R2+R2') when * C2=5) both it can make MOS1 and MOS2 pipes can To be connected rapidly, and the time in saturation region can be increased when MOS1 and MOS2 pipes turn off.All other corresponding commutation portions Divide structure and principle having the same.
Direct-current resistance tester for transformer anode detection mouth IN and direct-current resistance tester for transformer in the utility model Cathode detection mouth OUT accesses commutator transformer A phases, commutator transformer B phases, commutator transformer by the phase changer of the utility model C phases and the commutator transformer neutral conductor.
A kind of phase change method using above-mentioned phase changer, it includes the following steps:
Step 1:Commutator transformer A phase lines are detected by direct-current resistance tester for transformer, control relay A1 and control Relay A2 is powered, control relay A3, relay A4, relay A5 and relay A6 power-off;Relay A1 and relay at this time The normally opened of normally opened contact k1 and relay A2 of device A2 electrifications, MOS1 pipes and 2 pipe trigger signal circuit relay electric appliance A1 of MOS touch Point k2 is closed, and DC power supply DC1 is charged by resistance R1 to capacitance C1, and DC power supply DC2 is charged by resistance R2 to capacitance C2, MOS1 is managed and MOS2 manages corresponding commutator transformer A phase voltages and the conducting of current measurement major loop;When commutator transformer A phase controls Circuit disconnects, and capacitance C1 starts to discharge by resistance R1 and resistance R1', and capacitance C2 starts to discharge by resistance R2 and resistance R2', Commutator transformer A phase voltages and current measurement major loop are closed;
Step 2:Commutator transformer B phase lines are detected by direct-current resistance tester for transformer, control relay A3 and control Relay A4 is powered, control relay A1, relay A2, relay A5 and relay A6 power-off;Relay A3 and relay at this time The normally opened contact of the normally opened contact k3 and relay A4 of device A4 electrifications, MOS3 pipes and MOS4 pipe trigger signal circuit relay electric appliances A3 K4 is closed, and DC power supply DC1 is charged by resistance R3 to capacitance C3, and DC power supply DC2 is charged by resistance R4 to capacitance C4, MOS3 is managed and MOS4 manages corresponding commutator transformer B phase voltages and the conducting of current measurement major loop;When commutator transformer B phase controls Circuit disconnects, and capacitance C3 starts to discharge by resistance R3 and resistance R3', and capacitance C4 starts to discharge by resistance R4 and resistance R4', Commutator transformer B phase voltages and current measurement major loop are closed;
Step 3:Commutator transformer C phase lines are detected by direct-current resistance tester for transformer, control relay A5 and control Relay A6 is powered, control relay A1, relay A2, relay A3 and relay A4 power-off;Relay A5 and relay at this time The normally opened contact of the normally opened contact k5 and relay A6 of device A6 electrifications, MOS5 pipes and MOS6 pipe trigger signal circuit relay electric appliances A5 K6 is closed, and DC power supply DC1 is charged by resistance R5 to capacitance C5, and DC power supply DC2 is charged by resistance R6 to capacitance C6, MOS5 is managed and MOS6 manages corresponding commutator transformer C phase voltages and the conducting of current measurement major loop;When commutator transformer C phase controls Circuit disconnects, and capacitance C5 starts to discharge by resistance R5 and resistance R5', and capacitance C6 starts to discharge by resistance R6 and resistance R6', Commutator transformer C phase voltages and current measurement major loop are closed.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.

Claims (6)

1. a kind of special phase changer of direct-current resistance tester for transformer, it is characterised in that:It includes MOS1 pipes~MOS6 pipes, resistance R1~resistance R6, resistance R1'~resistance R6', capacitance C1~capacitance C6, relay A1~relay A6, DC power supply DC1 and straight Galvanic electricity source DC2, wherein the anode of one end connection DC power supply DC1 of the normally opened contact k1 of relay A1, one end of resistance R1' The cathode of DC power supply DC1 is connected, the other end of resistance R1' connects one end of relay A1 normally-closed contacts k1', and relay A1 is normal The other end of the normally opened contact k1 of the other end connection relay A1 of closed contact k1', the normally opened contact k1's of relay A1 is another The cathode connection direct current of one end of end connection resistance R1, the grid of the other end connection MOS1 pipes of resistance R1, DC power supply DC1 becomes The voltage tester connecting terminal U of the depressor neutral conductor, capacitance C1 be connected to the other end of resistance R1 and DC power supply DC1 cathode it Between, voltage tester connecting terminal U, the MOS1 pipe of the drain electrode connection direct-current resistance tester for transformer anode detection mouth of MOS1 pipes Source electrode connects commutator transformer A phases line voltages test connecting terminal U;
The anode of one end connection DC power supply DC2 of the normally opened contact k2 of relay A2, one end of resistance R2' connects DC power supply The cathode of DC2, one end of the other end connection relay A2 normally-closed contacts k2' of resistance R2', relay A2 normally-closed contacts k2''s The other end connects the other end of the normally opened contact k2 of relay A2, the other end connection resistance R2 of the normally opened contact k2 of relay A2 One end, the grid of the other end connection MOS2 pipes of resistance R2, the cathode connection commutator transformer neutral conductor of DC power supply DC2 Testing current connecting terminal I, capacitance C2 are connected between the other end of resistance R2 and the cathode of DC power supply DC2, MOS2 pipes The source electrode connection of testing current connecting terminal I, the MOS2 pipe of drain electrode connection direct-current resistance tester for transformer anode detection mouth is straight Convertor transformer A phase line currents test connecting terminal I;
The anode of one end connection DC power supply DC1 of the normally opened contact k3 of relay A3, one end of resistance R3' connects DC power supply The cathode of DC1, one end of the other end connection relay A3 normally-closed contacts k3' of resistance R3', relay A3 normally-closed contacts k3''s The other end connects the other end of the normally opened contact k3 of relay A3, the other end connection resistance R3 of the normally opened contact k3 of relay A3 One end, the grid of the other end connection MOS3 pipes of resistance R3, capacitance C3 is connected to the other end of resistance R3 and DC power supply DC1 Cathode between, MOS3 pipes drain electrode connection direct-current resistance tester for transformer anode detection mouth voltage tester connecting terminal U, The source electrode connection commutator transformer B phases line voltages test connecting terminal U of MOS1 pipes;
The anode of one end connection DC power supply DC2 of the normally opened contact k4 of relay A4, one end of resistance R4' connects DC power supply The cathode of DC2, one end of the other end connection relay A4 normally-closed contacts k4' of resistance R4', relay A4 normally-closed contacts k4''s The other end connects the other end of the normally opened contact k4 of relay A4, the other end connection resistance R4 of the normally opened contact k4 of relay A4 One end, the grid of the other end connection MOS4 pipes of resistance R4, capacitance C4 is connected to the other end of resistance R4 and DC power supply DC2 Cathode between, MOS4 pipes drain electrode connection direct-current resistance tester for transformer anode detection mouth testing current connecting terminal I, The source electrode connection commutator transformer B phase line currents test connecting terminal I of MOS4 pipes;
The anode of one end connection DC power supply DC1 of the normally opened contact k5 of relay A5, one end of resistance R5' connects DC power supply The cathode of DC1, one end of the other end connection relay A5 normally-closed contacts k5' of resistance R5', relay A5 normally-closed contacts k5''s The other end connects the other end of the normally opened contact k5 of relay A5, the other end connection resistance R5 of the normally opened contact k5 of relay A5 One end, the grid of the other end connection MOS5 pipes of resistance R5, capacitance C5 is connected to the other end of resistance R5 and DC power supply DC1 Cathode between, MOS5 pipes drain electrode connection direct-current resistance tester for transformer anode detection mouth voltage tester connecting terminal U, The source electrode connection commutator transformer C phases line voltages test connecting terminal U of MOS5 pipes;
The anode of one end connection DC power supply DC2 of the normally opened contact k6 of relay A6, one end of resistance R6' connects DC power supply The cathode of DC2, one end of the other end connection relay A6 normally-closed contacts k6' of resistance R6', relay A6 normally-closed contacts k6''s The other end connects the other end of the normally opened contact k6 of relay A6, the other end connection resistance R6 of the normally opened contact k6 of relay A6 One end, the grid of the other end connection MOS6 pipes of resistance R6, capacitance C6 is connected to the other end of resistance R6 and DC power supply DC2 Cathode between, MOS6 pipes drain electrode connection direct-current resistance tester for transformer anode detection mouth testing current connecting terminal I, The source electrode connection commutator transformer C phase line currents test connecting terminal I of MOS6 pipes.
2. the special phase changer of direct-current resistance tester for transformer according to claim 1, it is characterised in that:Transformer dc The voltage tester connecting terminal of the voltage tester terminals U connection commutator transformer neutral conductors of the cathode detection mouth of resistance meter U, the electric current of the testing current terminals I connection commutator transformer neutral conductors of the cathode detection mouth of direct-current resistance tester for transformer Test connecting terminal I.
3. the special phase changer of direct-current resistance tester for transformer according to claim 1, it is characterised in that:The direct current Source DC1 is identical as the voltage of DC power supply DC2.
4. the special phase changer of direct-current resistance tester for transformer according to claim 1, it is characterised in that:When transformer is straight When leakage resistance tester will detect commutator transformer A phase lines, control relay A1 and control relay A2 are powered, and control relay A3, relay A4, relay A5 and relay A6 power-off.
5. the special phase changer of direct-current resistance tester for transformer according to claim 1, it is characterised in that:When transformer is straight When leakage resistance tester will detect commutator transformer B phase lines, control relay A3 and control relay A4 are powered, and control relay A1, relay A2, relay A5 and relay A6 power-off.
6. the special phase changer of direct-current resistance tester for transformer according to claim 1, it is characterised in that:When transformer is straight When leakage resistance tester will detect commutator transformer C phase lines, control relay A5 and control relay A6 are powered, and control relay A1, relay A2, relay A3 and relay A4 power-off.
CN201721854236.7U 2017-12-26 2017-12-26 The special phase changer of direct-current resistance tester for transformer Active CN207650278U (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107966613A (en) * 2017-12-26 2018-04-27 国家电网公司 The special phase changer of direct-current resistance tester for transformer and phase change method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107966613A (en) * 2017-12-26 2018-04-27 国家电网公司 The special phase changer of direct-current resistance tester for transformer and phase change method
CN107966613B (en) * 2017-12-26 2020-02-07 国家电网公司 Special phase converter for transformer direct-current resistance tester and phase conversion method

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