CN107505585B - Device for detecting polarity of secondary loop of three-phase current transformer of power supply line - Google Patents

Device for detecting polarity of secondary loop of three-phase current transformer of power supply line Download PDF

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Publication number
CN107505585B
CN107505585B CN201710754433.XA CN201710754433A CN107505585B CN 107505585 B CN107505585 B CN 107505585B CN 201710754433 A CN201710754433 A CN 201710754433A CN 107505585 B CN107505585 B CN 107505585B
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China
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power supply
phase
double
contact
terminal
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CN201710754433.XA
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CN107505585A (en
Inventor
张硕
王鹏
江瑞敬
邢凯
张双谦
韩永进
杨广杰
尹献杰
陈兴东
张曼
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State Grid Corp of China SGCC
State Grid Hebei Electric Power Co Ltd
Handan Power Supply Co of State Grid Hebei Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Hebei Electric Power Co Ltd
Handan Power Supply Co of State Grid Hebei Electric Power Co Ltd
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Priority to CN201710754433.XA priority Critical patent/CN107505585B/en
Publication of CN107505585A publication Critical patent/CN107505585A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02Testing 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Road Signs Or Road Markings (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses a device for detecting the polarity of a secondary loop of a three-phase current transformer aiming at a power supply line, and relates to the technical field of electrician; the device comprises a primary side power supply circuit and a secondary side polarity detection circuit of a three-phase current transformer; the primary side power supply circuit consists of a first Direct Current (DC) 1, a power supply main switch K0, a button switch AN and 3 power supply branches of AN A-C phase, wherein the power supply main switch K0 is a double-pole single-throw switch, the 3 power supply branches of the A-C phase have the same structure, and the A-phase power supply branch consists of wiring terminals AP1 and AP2 of the primary side of the A phase and a first double-pole single-throw switch K1; the device for detecting the polarity of the secondary loop of the three-phase current transformer of the power supply line can finish detection tasks by one worker through detection control, intelligent prompt and other technologies, the working time is reduced from 90 minutes to 40 minutes, and the working efficiency is improved by 55%.

Description

Device for detecting polarity of secondary loop of three-phase current transformer of power supply line
Technical Field
The invention relates to the technical field of electricians, in particular to a device for detecting the polarity of a secondary loop of a three-phase current transformer of a power supply line.
Background
At present, when a current transformer CT is newly installed or replaced, the polarity of a secondary circuit of the current transformer CT needs to be detected, a traditional method is to connect a direct current battery to the primary side of the current transformer, then connect a milliammeter or a millivoltmeter to a wiring terminal of a corresponding secondary coil in a wiring terminal box, and instantly charge direct current to the primary side of the current transformer to check whether the pointer deflection of the milliammeter judges polarity correctness or not. The method has the following defects:
1. because the installation position of the 220kV and above current transformer is higher, at least three persons are usually required to perform cooperation work;
2. the primary side induction voltage of the 220kV and above line current transformer is higher, induction injury to people exists, and the peak value of the induction voltage of the 220kV switch line can reach about 120V;
3. if the wiring is incorrect, a person working cooperatively with the primary side and the secondary side of the current transformer can cause a test result error, and the normal operation of the protection equipment is affected;
4. the secondary side detector of the current transformer needs to repeatedly change the access position of the secondary side milliammeter or millivoltmeter, and the possible factors of wrong wiring exist, so that the test result is affected, and the working time is wasted.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device for detecting the polarity of a secondary loop of a three-phase current transformer of a power supply line, wherein the device for detecting the polarity of the secondary loop of the three-phase current transformer of the power supply line can finish a detection task by one worker through detection control, intelligent prompt and other technologies, the working time is reduced from 90 minutes to 40 minutes, and the working efficiency is improved by 55%.
In order to solve the technical problems, the invention adopts the following technical scheme: the primary side power supply circuit and the secondary side polarity detection circuit comprise a three-phase current transformer;
the primary side power supply circuit consists of a first Direct Current (DC) 1, a power supply main switch K0, a button switch AN and 3 power supply branches of AN A-C phase, wherein the power supply main switch K0 is a double-pole single-throw switch, the 3 power supply branches of the A-C phase have the same structure, the A-phase power supply branch consists of wiring terminals AP1 and AP2 of the A-phase primary side and a first double-pole single-throw switch K1, and the wiring terminals AP1 and AP2 of the A-phase primary side are homonymous terminals; the wiring terminal AP1 on the primary side of the A phase is connected with the contact N of the button switch AN through the contact 4 and the contact 2 of the first double-pole single-throw switch K1, the contact M of the button switch AN is connected with the positive electrode of the first direct current power supply DC1, and the wiring terminal AP2 on the primary side of the A phase is connected with the negative electrode of the first direct current power supply DC1 through the contact 2 and the contact 4 of the power supply master switch K0;
the secondary side polarity detection circuit is composed of 6 homonymous terminal branches composed of 6 groups of coils on the secondary side of an A-C phase and corresponding double-pole single-throw switches, 3 public terminal branches composed of common terminal branches composed of 6 groups of coils on the secondary side of the A-C phase, BS2 and CS2 and corresponding double-pole single-throw switches and a double-way swing milliamp meter A, the 6 homonymous terminal branches are identical in structure, wherein a first homonymous terminal branch is composed of homonymous terminal 1S1 and a fourth double-pole single-throw switch K4 of a first group of coils, and the homonymous terminal 1S1 of the first group of coils is connected with a positive terminal of the double-way swing milliamp meter A through a contact 4 and a contact 2 of the fourth double-pole single-throw switch K4; the 3 public terminal branches have the same structure, wherein the A-phase public terminal branch consists of a public terminal AS2 on the secondary side of the A-phase and a tenth double-pole single-throw switch K10, and the public terminal AS2 on the secondary side of the A-phase is connected with the negative terminal of the double-direction swing milliamp meter A through a contact 4 and a contact 2 of the tenth double-pole single-throw switch K10.
The further technical proposal is that: the primary side power supply circuit and the secondary side polarity detection circuit also comprise indicator light circuits, the indicator light circuits of the primary side power supply circuit and the indicator light circuits of the secondary side polarity detection circuit have the same structure, wherein the indicator light circuits of the primary side power supply circuit consist of a second direct current power supply DC2, a power supply total switch K0 and 3 indicator light branches of A-C phases; the branch structures of the 3 indicator lights of the A-C phase are the same, wherein the branch route of the A-phase indicator light consists of a first indicator light D1 and a first double-pole single-throw switch K1; one end of the first indicator lamp D1 is connected with the positive electrode of the second direct current power supply DC2 through a contact 3 and a contact 1 of the first double-pole single-throw switch K1, and the other end of the first indicator lamp D1 is connected with the negative electrode of the second direct current power supply DC2 through a contact 1 and a contact 3 of the power supply main switch K0.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in:
firstly, easy and simple to handle, high-efficient, only need a staff to accomplish the detection task, operating time reduces 40 minutes from 90 minutes originally, and work efficiency has improved 55%. Before detection, after the detection line is connected once, the detection line is directly detected, and when the detection is carried out, once abnormality is found, the error wiring sequence in the junction box at the lower part is directly corrected, so that frequent reciprocating ascending is not needed, and the time is saved.
Secondly, the primary voltage, primary current, secondary voltage and secondary current in detection are all smaller, and the operation is very safe.
Thirdly, the indicating circuit has an intelligent prompt function, so that when the detecting circuit detects, the detecting circuit can conveniently know which branch is detected, and the detecting circuit is convenient for guiding the detecting and correcting.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a panel diagram of the present invention;
fig. 3 is a diagram showing the connection of the connection terminal of the present invention to the primary and secondary coil circuits of the three-phase current transformer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
AS shown in fig. 1 to 3, the invention discloses a device for detecting the polarity of a secondary loop of a three-phase current transformer of a power supply line, which comprises a detection box, a panel arranged at the top of the detection box and used for operation, a main power switch K0, a button switch AN, first double-pole single-throw switches K1 to twelfth double-pole single-throw switches K12, wiring terminals AP1 and AP2 at the primary side of AN a phase, wiring terminals BP1 and BP2 at the primary side of a B phase, wiring terminals CP1 and CP2 at the primary side of a C phase, common terminal wiring terminals AS2, BS2 and CS2 of 6 groups of coils at the secondary side of AN a-C phase, first indicator lamps D1 to twelfth indicator lamps D1, a double-swing milliamp meter a, and further comprises first direct current power supply DC1 and second direct current power supply DC2 arranged inside the detection box.
The power supply circuit comprises a first direct-current power supply DC1, a power supply main switch K0, a button switch AN and 3 power supply branches of A-C phases, wherein the power supply main switch K0 is a double-pole single-throw switch, the 3 power supply branches of A-C phases have the same structure, the A-phase power supply branch consists of wiring terminals AP1 and AP2 of A-phase primary sides and a first double-pole single-throw switch K1, and the wiring terminals AP1 and AP2 of A-phase primary sides are homonymous terminals; the wiring terminal AP1 on the primary side of the A phase is connected with the contact N of the button switch AN through the contact 4 and the contact 2 of the first double-pole single-throw switch K1, the contact M of the button switch AN is connected with the positive electrode of the first direct current power supply DC1, and the wiring terminal AP2 on the primary side of the A phase is connected with the negative electrode of the first direct current power supply DC1 through the contact 2 and the contact 4 of the power supply master switch K0;
the common terminal AS2, BS2 and CS2 of the 6 coils on the secondary side of the A-C phase respectively form a secondary side polarity detection circuit with 3 common terminal branches formed by the corresponding double-pole single-throw switches and a double-swing milliamp meter A, the 6 common terminal branches have the same structure, wherein the first common terminal branch is formed by the common terminal 1S1 of the first coil and the fourth double-pole single-throw switch K4, and the common terminal 1S1 of the first coil is connected with the positive terminal of the double-swing milliamp meter A through the contact 4 and the contact 2 of the fourth double-pole single-throw switch K4; the 3 public terminal branches have the same structure, wherein the A-phase public terminal branch consists of a public terminal AS2 on the secondary side of the A-phase and a tenth double-pole single-throw switch K10, and the public terminal AS2 on the secondary side of the A-phase is connected with the negative terminal of the double-direction swing milliamp meter A through a contact 4 and a contact 2 of the tenth double-pole single-throw switch K10.
The primary side power supply circuit and the secondary side polarity detection circuit also comprise indicator light circuits, the indicator light circuits of the primary side power supply circuit and the indicator light circuits of the secondary side polarity detection circuit have the same structure, wherein the indicator light circuits of the primary side power supply circuit consist of a second direct current power supply DC2, a power supply total switch K0 and 3 indicator light branches of A-C phases; the branch structures of the 3 indicator lights of the A-C phase are the same, wherein the branch route of the A-phase indicator light consists of a first indicator light D1 and a first double-pole single-throw switch K1; one end of the first indicator lamp D1 is connected with the positive electrode of the second direct current power supply DC2 through a contact 3 and a contact 1 of the first double-pole single-throw switch K1, and the other end of the first indicator lamp D1 is connected with the negative electrode of the second direct current power supply DC2 through a contact 1 and a contact 3 of the power supply main switch K0.
Preparation before detection:
connecting a wiring terminal AP1 of the primary side of the A-phase current transformer to a wiring terminal AP1 of the same-name end of the invention, and connecting a wiring terminal AP2 of the primary side of the A-phase current transformer to a wiring terminal AP2 of the same-name end of the invention; the wiring mode of the B-C phases is the same. The same-name end wiring terminals 1S1 of the first group of coils on the secondary side of the A-C phase are connected to the same-name end wiring terminals 1S1 of the invention, and the same-name end wiring terminals of the other five groups of coils on the secondary side of the A-C phase are connected in the same mode as the same-name end wiring terminals of the invention in a one-to-one corresponding mode.
The detection step comprises:
s1 starting up
Closing the power supply main switch K0.
S2 detection
S201 detecting polarity relationship between primary coil and secondary coil of A-phase current transformer
Closing the first double-pole single-throw switch K1, and lighting the first indicator lamp D1;
closing a tenth double-pole single-throw switch K10, and lighting a tenth indicator lamp D10;
closing a fourth double-pole single-throw switch K4, turning on a fourth indicator lamp D4, pressing a button switch AN, and forward deflecting a pointer of a double-swing milliamp meter A, so that wiring of wiring terminals 1S1 and 1S2 of a secondary side coil of AN A-phase current transformer is correct, and turning off the fourth indicator lamp D4;
by adopting the detection mode, whether other wiring terminals of the secondary side coil of the A-phase current transformer are correctly wired is sequentially detected;
the tenth double-pole single-throw switch K10 is turned off, and the tenth indicator lamp D10 is turned off;
the first double-pole single-throw switch K1 is turned off, and the first indicator lamp D1 is turned off.
S202 detecting polarity relationship between primary coil and secondary coil of B-phase current transformer
The detection mode is the same as that of the phase A current transformer.
S203 detecting polarity relationship between primary coil and secondary coil of C-phase current transformer
The detection mode is the same as that of the phase A current transformer.

Claims (1)

1. The utility model provides a device to power supply line three-phase current transformer secondary circuit polarity detection which characterized in that: the primary side power supply circuit and the secondary side polarity detection circuit comprise a three-phase current transformer; the primary side power supply circuit consists of a first Direct Current (DC) 1, a power supply main switch K0, a button switch AN and 3 power supply branches of AN A-C phase, wherein the power supply main switch K0 is a double-pole single-throw switch, the 3 power supply branches of the A-C phase have the same structure, the A-phase power supply branch consists of wiring terminals AP1 and AP2 of the A-phase primary side and a first double-pole single-throw switch K1, and the wiring terminals AP1 and AP2 of the A-phase primary side are homonymous terminals; the wiring terminal AP1 on the primary side of the A phase is connected with the contact N of the button switch AN through the contact 4 and the contact 2 of the first double-pole single-throw switch K1, the contact M of the button switch AN is connected with the positive electrode of the first direct current power supply DC1, and the wiring terminal AP2 on the primary side of the A phase is connected with the negative electrode of the first direct current power supply DC1 through the contact 2 and the contact 4 of the power supply master switch K0; the secondary side polarity detection circuit is composed of 6 homonymous terminal branches composed of 6 groups of coils on the secondary side of an A-C phase and corresponding double-pole single-throw switches, 3 public terminal branches composed of common terminal branches composed of 6 groups of coils on the secondary side of the A-C phase, BS2 and CS2 and corresponding double-pole single-throw switches and a double-way swing milliamp meter A, the 6 homonymous terminal branches are identical in structure, wherein a first homonymous terminal branch is composed of homonymous terminal 1S1 and a fourth double-pole single-throw switch K4 of a first group of coils, and the homonymous terminal 1S1 of the first group of coils is connected with a positive terminal of the double-way swing milliamp meter A through a contact 4 and a contact 2 of the fourth double-pole single-throw switch K4; the 3 public terminal wiring terminal branches have the same structure, wherein an A-phase public terminal wiring terminal branch consists of a public terminal wiring terminal AS2 on the secondary side of an A-phase and a tenth double-pole single-throw switch K10, and the public terminal wiring terminal AS2 on the secondary side of the A-phase is connected with a negative terminal of a double-direction swing milliamp meter A through a contact 4 and a contact 2 of the tenth double-pole single-throw switch K10; the primary side power supply circuit and the secondary side polarity detection circuit also comprise indicator light circuits, the indicator light circuits of the primary side power supply circuit and the indicator light circuits of the secondary side polarity detection circuit have the same structure, wherein the indicator light circuits of the primary side power supply circuit consist of a second direct current power supply DC2, a power supply total switch K0 and 3 indicator light branches of A-C phases; the branch structures of the 3 indicator lights of the A-C phase are the same, wherein the branch route of the A-phase indicator light consists of a first indicator light D1 and a first double-pole single-throw switch K1; one end of the first indicator lamp D1 is connected with the positive electrode of the second direct current power supply DC2 through a contact 3 and a contact 1 of the first double-pole single-throw switch K1, and the other end of the first indicator lamp D1 is connected with the negative electrode of the second direct current power supply DC2 through a contact 1 and a contact 3 of the power supply main switch K0.
CN201710754433.XA 2017-08-29 2017-08-29 Device for detecting polarity of secondary loop of three-phase current transformer of power supply line Active CN107505585B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009236662A (en) * 2008-03-27 2009-10-15 Takaoka Electric Mfg Co Ltd Method of testing transformer for gauge
KR20090132349A (en) * 2008-06-20 2009-12-30 손석환 Current transformer checker
WO2011120457A2 (en) * 2011-05-04 2011-10-06 华为技术有限公司 Switch control circuit for power supply and power supplying circuit
CN203133226U (en) * 2013-04-03 2013-08-14 国家电网公司 Polarity testing instrument for current transformer
CN103472357A (en) * 2013-08-23 2013-12-25 国家电网公司 Polarity detecting device of current transformer
CN203838286U (en) * 2014-05-14 2014-09-17 国网山东沂源县供电公司 Current transformer polarity tester
CN207336738U (en) * 2017-08-29 2018-05-08 国家电网公司 A kind of device for supply line's threephase current transformer secondary circuit Check up polarity

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012105077A1 (en) * 2011-02-01 2012-08-09 富士電機株式会社 Resonant-type switching power supply apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009236662A (en) * 2008-03-27 2009-10-15 Takaoka Electric Mfg Co Ltd Method of testing transformer for gauge
KR20090132349A (en) * 2008-06-20 2009-12-30 손석환 Current transformer checker
WO2011120457A2 (en) * 2011-05-04 2011-10-06 华为技术有限公司 Switch control circuit for power supply and power supplying circuit
CN203133226U (en) * 2013-04-03 2013-08-14 国家电网公司 Polarity testing instrument for current transformer
CN103472357A (en) * 2013-08-23 2013-12-25 国家电网公司 Polarity detecting device of current transformer
CN203838286U (en) * 2014-05-14 2014-09-17 国网山东沂源县供电公司 Current transformer polarity tester
CN207336738U (en) * 2017-08-29 2018-05-08 国家电网公司 A kind of device for supply line's threephase current transformer secondary circuit Check up polarity

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