CN204679581U - A kind of portable type current transformer polarity test device - Google Patents
A kind of portable type current transformer polarity test device Download PDFInfo
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- CN204679581U CN204679581U CN201520296744.2U CN201520296744U CN204679581U CN 204679581 U CN204679581 U CN 204679581U CN 201520296744 U CN201520296744 U CN 201520296744U CN 204679581 U CN204679581 U CN 204679581U
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- secondary side
- calibrating terminal
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- current transformer
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- 238000012360 testing method Methods 0.000 title claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 27
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a kind of portable type current transformer polarity test device, its technical scheme is: the outside of housing is provided with switch, the inside of housing is provided with CT winding, power supply connects CT winding by switch, the outside of housing is provided with primary side calibrating terminal L1, L2 and secondary side calibrating terminal K1, K2, primary side calibrating terminal L1, L2 and secondary side calibrating terminal K1, K2 connects CT winding respectively, secondary side calibrating terminal K1, K2 is provided with secondary side circuit, secondary side calibrating terminal K1, reverse parallel connection first light emitting diode and the second light emitting diode on the secondary side circuit of the upper composition of K2, the beneficial effects of the utility model are: on the basis ensureing CT polarity test accuracy, not only increase the integrated level of test loop, and its portability outstanding, also optimizes the mode of polarity discriminating.
Description
Technical field
The utility model relates to a kind of current transformer polarity testing equipment, particularly a kind of portable type current transformer polarity test device.
Background technology
Current transformer is (hereinafter referred to as CT; Current Transformer) be one of most important electric power components and parts in electric system, the big current of electric system primary side can be converted into the secondary circuits such as secondary current supply protection, measurement, metering, recorded broadcast by alternating flux and use by it.Once the reverse polarity connection of CT secondary side circuit, just very likely cause protective device (function) tripping or the malfunction of some band discriminating direction conditions, thus work the mischief to the safe and stable operation of electrical network.Therefore, before the new CT of installation puts into operation or after changing CT secondary cable, testing the polarity of above-mentioned CT is in time the working link that relay protection staff is indispensable.
At present, the CT winding polarity method of testing that power department relay protection staff adopts usually mainly contains DC-method, instrument method (namely using complete mutual-inductor tester to carry out the test of CT winding polarity) etc.Wherein, DC-method components and parts (first kind battery, sub-thread or multiply annealed copper wire, DC milliammeter) needed for it are relatively cheap and principle is visual and understandable, more praise highly by field personnel.But being limited to the natural quality of above-mentioned components and parts and the design concept of test loop, inevitably there is following defect in it: 1) first kind battery, DC milliammeter volume are very much not portable, and test loop integrated level is poor; 2) owing to needing the reverse-biased situation of the positively biased of Real Time Observation DC milliammeter, operating process needs several staff to cooperatively interact, and waste time and energy inefficiency; 3) be limited to DC milliammeter range to fix, measurement sensitivity is difficult to ensure.
Summary of the invention
The purpose of this utility model is exactly in view of the foregoing defects the prior art has, provides a kind of portable type current transformer polarity test device.
Its technical scheme is: comprise housing, switch, power supply, CT winding, the outside of housing is provided with switch, the inside of housing is provided with CT winding, power supply connects CT winding by switch, the outside of housing is provided with primary side calibrating terminal L1, L2 and secondary side calibrating terminal K1, K2, primary side calibrating terminal L1, L2 and secondary side calibrating terminal K1, K2 connects CT winding respectively, secondary side calibrating terminal K1, K2 is provided with secondary side circuit, secondary side calibrating terminal K1, reverse parallel connection first light emitting diode and the second light emitting diode on the secondary side circuit of the upper composition of K2.
The second above-mentioned light emitting diode is provided with current-limiting resistance.
The beneficial effects of the utility model are: on the basis ensureing CT polarity test accuracy, not only increase the integrated level of test loop, and its portability outstanding, also optimizes the mode of polarity discriminating, make it more intuitively and are not subject to the impact of human factor.It, to the safe and stable operation ensureing grid equipment particularly protective relaying device, improves the global reliability of electric power supply.
Accompanying drawing explanation
Accompanying drawing 1 is structural representation of the present utility model;
Accompanying drawing 2 is electrical block diagrams of the present utility model.
Embodiment
1-2 by reference to the accompanying drawings, the utility model will be further described:
The utility model comprises housing 1, switch S, power supply E, CT winding, the outside of housing is provided with switch S, the inside of housing is provided with CT winding, power supply E connects CT winding by switch S, the outside of housing is provided with primary side calibrating terminal L1, L2 and secondary side calibrating terminal K1, K2, primary side calibrating terminal L1, L2 and secondary side calibrating terminal K1, K2 connects CT winding respectively, secondary side calibrating terminal K1, K2 is provided with secondary side circuit, secondary side calibrating terminal K1, reverse parallel connection first LED 1 and the second LED 2 on the secondary side circuit of the upper composition of K2.
Wherein, the second LED 2 is provided with current-limiting resistance R.
The using method of the portable type current transformer polarity test device that the utility model is mentioned, comprises the following steps:
A) in proving installation circuit, L1 and K1 is respectively the polar end of CT winding primary side loop and secondary side circuit, when in primary side loop, electric current flows to L2 by L1, be subtractive polarity when in secondary side circuit, electric current flows to K1 by K2, it is correct that the first LED 1 green light illustrates that polarity connects; Otherwise be additive polarity, the second LED 2 when red indicates reverse polarity connection;
B) in CT winding secondary side circuit, the first LED 1 of reverse parallel connection and the second LED 2 can send ruddiness and green glow respectively when conducting, are used to refer to additive polarity and the subtractive polarity of CT winding.On second LED 2 of CT winding, also string has more than one grade of adjustable current-limiting resistance, the excessive or too high damage light emitting diode of reverse voltage of induction current in loop when being used for preventing the Turn Ratio Changing when CT winding;
C) be 0.7V according to the Typical operating voltages of light emitting diode, can not normally indicate lower than light emitting diode during 0.4V, higher than then easily breakdown during 1.4V, according to formula:
The resistance R needing the current-limiting resistance sealed in CT winding secondary circuit can be calculated.Wherein, V
2for the operating voltage needed for reverse parallel connection light emitting diode; I
2for CT winding secondary side current; V
1for CT winding primary side voltage; R
1for the CT winding primary side impedance representative value that CT manufacturer provides;
for the no-load voltage ratio coefficient of CT, ensure that the voltage being added in light emitting diode two ends can fall within its normal operational voltage value interval all the time by current-limiting resistance R;
D) utilize small volume to be easy to integrated accumulator and substitute the primary side loop that first kind battery seals in CT winding, primary side calibrating terminal L1, L2 and secondary side calibrating terminal K1, K2 totally 4 binding post different colours are distinguished, be respectively used to the polar end and the non-polar end that connect CT primary side and secondary side, a test start stop switch, for the start and stop of control device, two light emitting diodes that can send green glow and ruddiness respectively also must stretch out housing, are convenient to observe and decide CT polarity.
Claims (2)
1. a portable type current transformer polarity test device, it is characterized in that: comprise housing (1), switch S, power supply E, CT winding, the outside of housing is provided with switch S, the inside of housing (1) is provided with CT winding, power supply E connects CT winding by switch S, the outside of housing (1) is provided with primary side calibrating terminal L1, L2 and secondary side calibrating terminal K1, K2, primary side calibrating terminal L1, L2 and secondary side calibrating terminal K1, K2 connects CT winding respectively, secondary side calibrating terminal K1, K2 is provided with secondary side circuit, secondary side calibrating terminal K1, reverse parallel connection first LED 1 and the second LED 2 on the secondary side circuit of the upper composition of K2.
2. a kind of portable type current transformer polarity test device according to claim 1, is characterized in that: the second described LED 2 is provided with current-limiting resistance R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520296744.2U CN204679581U (en) | 2015-05-08 | 2015-05-08 | A kind of portable type current transformer polarity test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520296744.2U CN204679581U (en) | 2015-05-08 | 2015-05-08 | A kind of portable type current transformer polarity test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204679581U true CN204679581U (en) | 2015-09-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520296744.2U Expired - Fee Related CN204679581U (en) | 2015-05-08 | 2015-05-08 | A kind of portable type current transformer polarity test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204679581U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842579A (en) * | 2016-05-31 | 2016-08-10 | 国网青海省电力公司西宁供电公司 | Portable current transformer polarity tester |
| CN109298280A (en) * | 2018-10-29 | 2019-02-01 | 国网新疆电力有限公司昌吉供电公司 | Current transformer device for detecting polarity with self-test circuit |
| CN112881832A (en) * | 2021-01-15 | 2021-06-01 | 国网山西省电力公司晋城供电公司 | Relay protection circuit calibration system |
-
2015
- 2015-05-08 CN CN201520296744.2U patent/CN204679581U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842579A (en) * | 2016-05-31 | 2016-08-10 | 国网青海省电力公司西宁供电公司 | Portable current transformer polarity tester |
| CN109298280A (en) * | 2018-10-29 | 2019-02-01 | 国网新疆电力有限公司昌吉供电公司 | Current transformer device for detecting polarity with self-test circuit |
| CN112881832A (en) * | 2021-01-15 | 2021-06-01 | 国网山西省电力公司晋城供电公司 | Relay protection circuit calibration system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20160508 |