CN202004451U - Secondary open circuit protection device of intelligent current transformer - Google Patents
Secondary open circuit protection device of intelligent current transformer Download PDFInfo
- Publication number
- CN202004451U CN202004451U CN2011200798278U CN201120079827U CN202004451U CN 202004451 U CN202004451 U CN 202004451U CN 2011200798278 U CN2011200798278 U CN 2011200798278U CN 201120079827 U CN201120079827 U CN 201120079827U CN 202004451 U CN202004451 U CN 202004451U
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- CN
- China
- Prior art keywords
- current transformer
- open circuit
- protection device
- circuit protection
- pressure limiting
- 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.)
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Abstract
The utility model discloses a secondary open circuit protection device of an intelligent current transformer, comprising two piezoresistor voltage limiting devices and a fast relay, an actuating coil of the fast relay is connected with one piezoresistor voltage limiting device in parallel, the two piezoresistor voltage limiting devices are connected serially and then are connected with one contact of the fast relay in parallel, and then the above connecting structure is connected in a secondary circuit of the current transformer. The secondary open circuit protection device has the advantages that the voltage is limited timely, and heating and burning phenomena are eliminated, so as to ensure the reliability of the device; overvoltage can not be generated after resetting.
Description
[technical field]
The utility model relates to power electronic product, specifically relates to a kind of open-circuit protecting device.
[background technology]
In the electric power system, current transformer uses more extensive, in detection and use, the Current Transformer Secondary open circuit that the Current Transformer Secondary broken string causes often occurs, and produce the high pressure of tens thousand of volts in the Current Transformer Secondary side, threatened the safety of the person and equipment greatly.Electric power system now is to solve this type of problem by installing the current transformer open-circuit protector additional.
The second open circuit protector of prior art has following shortcoming:
1, the actuating of relay is slow, and restriction effect is bad, sometimes tripping.
2, after the controllable silicon triggering and conducting, often can not automatically shut down, easily heating is hot, causes damaging, and reliability is not strong.
3, reset certainly after, may once produce loop overvoltage phenomenon.
[summary of the invention]
Technical problem to be solved in the utility model is to provide a kind of good reliability, also can not produce the intelligent second open circuit protector of current mutual inductor of overvoltage phenomenon after resetting.
The utility model solves the problems of the technologies described above by the following technical programs: a kind of intelligent second open circuit protector of current mutual inductor; comprise two piezo-resistance pressure limiting devices and a high-speed relay; the high-speed relay actuation coil is in parallel with one of them piezo-resistance pressure limiting device; two piezo-resistance pressure limiting device series connection backs are in parallel with one of them contact of high-speed relay, are connected on then in the secondary circuit of current transformer.
The utility model has the advantages that: instant pressure limiting, stop heating, hot phenomenon, thereby assurance device reliability can not produce overvoltage yet after resetting.
[description of drawings]
Fig. 1 is the utility model intelligence second open circuit protector of current mutual inductor circuit theory diagrams.
[embodiment]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings, so that those skilled in the art can better understand the utility model and being implemented, but illustrated embodiment is not as to qualification of the present utility model.
The utility model intelligence second open circuit protector of current mutual inductor comprises two piezo-resistance pressure limiting device FR1, FR2 and a high-speed relay.
The high-speed relay actuation coil is in parallel with one of them piezo-resistance pressure limiting device, and two piezo-resistance pressure limiting device FR1, FR2 series connection backs are in parallel with one of them contact of high-speed relay, are connected on then in the secondary circuit of current transformer.
In the present embodiment, the model of described high-speed relay is OMR-SH-212L.
When the secondary circuit overvoltage of current transformer, the pressure limiting of piezo-resistance pressure limiting device, instant pressure limiting when reaching operating value, high-speed relay action simultaneously is with the Current Transformer Secondary loop short circuit again of opening a way, move reliable and stablely, pressure limiting is accurate, stops heating, hot phenomenon, thereby assurance device reliability.After resetting, can not produce overvoltage yet.
Claims (1)
1. intelligent second open circuit protector of current mutual inductor; it is characterized in that: comprise two piezo-resistance pressure limiting devices and a high-speed relay; the high-speed relay actuation coil is in parallel with one of them piezo-resistance pressure limiting device; two piezo-resistance pressure limiting device series connection backs are in parallel with one of them contact of high-speed relay, are connected on then in the secondary circuit of current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200798278U CN202004451U (en) | 2011-03-24 | 2011-03-24 | Secondary open circuit protection device of intelligent current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200798278U CN202004451U (en) | 2011-03-24 | 2011-03-24 | Secondary open circuit protection device of intelligent current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202004451U true CN202004451U (en) | 2011-10-05 |
Family
ID=44707178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200798278U Expired - Fee Related CN202004451U (en) | 2011-03-24 | 2011-03-24 | Secondary open circuit protection device of intelligent current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202004451U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368161A (en) * | 2012-04-10 | 2013-10-23 | 西门子公司 | Switch device with over-voltage protection |
| CN104898006A (en) * | 2014-03-04 | 2015-09-09 | 国家电网公司 | Current transformer secondary side open circuit anticipation device |
| CN106684820A (en) * | 2016-11-09 | 2017-05-17 | 国网天津市电力公司 | Open circuit automatic protection device for secondary circuit of high voltage current transformer |
| CN110908285A (en) * | 2019-12-10 | 2020-03-24 | 国网山西省电力公司长治供电公司 | Adaptive control system of composite transformation ratio current transformer |
-
2011
- 2011-03-24 CN CN2011200798278U patent/CN202004451U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368161A (en) * | 2012-04-10 | 2013-10-23 | 西门子公司 | Switch device with over-voltage protection |
| CN103368161B (en) * | 2012-04-10 | 2016-04-06 | 西门子公司 | There is the switching device of overvoltage protection |
| CN104898006A (en) * | 2014-03-04 | 2015-09-09 | 国家电网公司 | Current transformer secondary side open circuit anticipation device |
| CN106684820A (en) * | 2016-11-09 | 2017-05-17 | 国网天津市电力公司 | Open circuit automatic protection device for secondary circuit of high voltage current transformer |
| CN110908285A (en) * | 2019-12-10 | 2020-03-24 | 国网山西省电力公司长治供电公司 | Adaptive control system of composite transformation ratio current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111005 Termination date: 20140324 |