CN205720458U - A kind of voltage transformer secondary side neutral point overvoltage protection action recording device - Google Patents
A kind of voltage transformer secondary side neutral point overvoltage protection action recording device Download PDFInfo
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- CN205720458U CN205720458U CN201620243340.1U CN201620243340U CN205720458U CN 205720458 U CN205720458 U CN 205720458U CN 201620243340 U CN201620243340 U CN 201620243340U CN 205720458 U CN205720458 U CN 205720458U
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Abstract
The open a kind of voltage transformer secondary side neutral point overvoltage protection action recording device of this utility model, including secondary windings of PT and monitoring system, also include the first current input terminal and current output terminal, described first current input terminal is electrically connected with the overvoltage protector earth terminal of at least one secondary windings of PT, described current output terminal ground connection, also include the current transformer that primary side perception is connected between the first current input terminal and current output terminal on connecting line, two ends, Current Transformer Secondary side input dual-port with the exchange of full-wave rectifying circuit and are connected, the direct current output dual-port of full-wave rectifying circuit connects the coil two ends of an electric current relay K respectively, the normally opened contact both sides of electric current relay are communicated to connect with monitoring system by two terminals.This utility model carries out action frequency and adds up and monitoring record the action situation of overvoltage protector, and insulation and accident analysis for voltage transformer provide foundation.
Description
Technical field
This utility model relates to power system monitoring field, is specifically related to a kind of voltage transformer secondary side neutral point overvoltage protection action recording device.
Background technology
Although voltage transformer secondary side voltage is relatively low, but still it is a dangerous voltage, and voltage transformer rated capacity is the least, and the conductor cross-section of coil is the least, does not possess overload capacity.Once secondary side is short-circuited producing the biggest short-circuit current, can be burnt out by voltage transformer in a short period of time.At present; protection to voltage transformer secondary side insulation; it is to install breakdown fuse or zinc oxide overvoltage protector additional in its secondary side neutral point, but such device cannot carry out record to the action situation of overvoltage protector, it is impossible to the monitoring for Secondary Winding insulation situation provides data.
Utility model content
The purpose of this utility model is for above-mentioned problems of the prior art, proposes a kind of voltage transformer secondary side neutral point overvoltage protection action recording device, it is achieved the monitoring of Secondary Winding insulation situation.
For reaching the purpose of above-mentioned utility model, this utility model is achieved through the following technical solutions:
nullA kind of voltage transformer secondary side neutral point overvoltage protection action recording device，Including secondary windings of PT to be detected and the monitoring system of reception actuating signal，Also include the first current input terminal X1 and current output terminal X3，Described first current input terminal X1 is electrically connected with the overvoltage protector earth terminal of at least one secondary windings of PT,Described current output terminal X3 ground connection，Also include the current transformer L that primary side perception is connected between the first current input terminal X1 and current output terminal X3 on connecting line、Current transformer L secondary side two ends input dual-port with the exchange of full-wave rectifying circuit and are connected，The direct current output dual-port of full-wave rectifying circuit connects the coil two ends of an electric current relay K respectively，The normally opened contact both sides of electric current relay K connect the first signal output part X4 and secondary signal outfan X5，Described first signal output part X4 and secondary signal outfan X5 communicates to connect with monitoring system.
Also include the second current input terminal mouth X2 for being directly connected to secondary windings of PT neutral point; inside device; second current input terminal X2 is in series with interior overvoltage protector, and is connected across on the connection line between the first current input terminal X1 summation current transformer L.
The direct current output two ends of described full-wave rectifying circuit are also parallel with adjustable resistance R.
The overvoltage enumerator P of statistics electric current relay K normally opened contact action frequency also it is in series with between coil one end and the DC output end of full-wave rectifying circuit of described electric current relay K.
Described full-wave rectifying circuit includes four diode composition rectification circuits.
A kind of voltage transformer secondary side neutral point overvoltage protection action recording device of the present utility model; it is integrated with voltage transformer secondary side neutral point overvoltage protector, overvoltage protection action transmitting device and the function of overvoltage protection action frequency integrating device; and the operating sensitivity that can transmit electric current relay K is adjusted; the action situation of overvoltage protector carries out action frequency is accumulative and monitoring record, and insulation and accident analysis for voltage transformer provide foundation.Meanwhile, device provides the function using interior overvoltage protector and outside overvoltage protector to select to user, facilitates user's in-site installation to use.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of voltage transformer secondary side neutral point overvoltage protection action recording device of the present utility model.
Detailed description of the invention
With embodiment, the technical scheme in this utility model embodiment is clearly and completely described below in conjunction with the accompanying drawings, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiment.
Referring to Fig. 1, it is the elementary diagram of voltage transformer secondary side neutral point overvoltage protection action recording device of the present utility model.
A kind of voltage transformer secondary side neutral point overvoltage protection action recording device of the present embodiment, including secondary windings of PT 1 to be detected and the monitoring system 4 of reception actuating signal, also include the first current input terminal X1 and current output terminal X3, described first current input terminal X1 is electrically connected with overvoltage protector 2 earth terminal of at least one secondary windings of PT 1, described current output terminal X3 ground connection, by the first current input terminal X1 and current output terminal X3 being serially connected between outside overvoltage protector 2 and ground, when outside over-pressure safety device action 2, loop is flow through electric current；
Also including the current transformer L that primary side perception is connected between the first current input terminal X1 and current output terminal X3 on connection line, current transformer L detects this connection line upstream overcurrent, then the secondary side at current transformer L produces faradic current；
Current transformer L secondary side two ends input dual-port with the exchange of full-wave rectifying circuit 31 and are connected, the direct current output dual-port of full-wave rectifying circuit 31 connects the coil two ends of an electric current relay K respectively, after the alternating current that current transformer L produces is converted to unidirectional current by full-wave rectifying circuit 31, in order to make electric current relay K action；
The normally opened contact both sides of electric current relay K connect the first signal output part X4 and secondary signal outfan X5, described first signal output part X4 communicates to connect with monitoring system 4 with secondary signal outfan X5, the coil of electric current relay K flows through electric current, then trigger normally opened contact Guan Bi, thus send actuating signal to monitoring system 4.
It is further used as another embodiment; voltage transformer secondary side neutral point overvoltage protection action recording device of the present utility model also includes the second current input terminal mouth X2 for being directly connected to secondary windings of PT neutral point; inside device; second current input terminal X2 is in series with interior overvoltage protector, and is connected across on the connection line between the first current input terminal X1 summation current transformer L.When the first current input terminal X1 is unsettled, it is directly connected to the neutral point of voltage transformer 1 only with the second current input terminal X2, it is simple to site operation people uses this device flexibly, with the situation lacking for on-the-spot overvoltage protector or damaging.
The direct current output two ends of described full-wave rectifying circuit 31 are also parallel with adjustable resistance R, and above-mentioned two way of example all can be by the action sensitivity of adjustable resistance R adjusting means, it is ensured that device action message.
The overvoltage enumerator P of statistics electric current relay K normally opened contact action frequency also it is in series with between coil one end and the DC output end of full-wave rectifying circuit 31 of described electric current relay K.Overvoltage enumerator P can add up action frequency, provides foundation for voltage transformer insulation situation analysis.
As specific embodiment, described full-wave rectifying circuit 31 includes four diode D1-D4 and forms rectification circuit.
Above-described embodiment is only in order to illustrate this utility model and and technical scheme described by unrestricted this utility model；Therefore, although this specification has been carried out detailed description with reference to each above-mentioned embodiment to this utility model, but, it will be understood by those within the art that, still this utility model can be modified or equivalent；And all are without departing from the technical scheme of spirit and scope of the present utility model and improvement thereof, it all should be contained in the middle of right of the present utility model.
Claims (5)
- null1. a voltage transformer secondary side neutral point overvoltage protection action recording device，Including secondary windings of PT (1) to be detected and the monitoring system (4) of reception actuating signal，It is characterized in that，Include the first current input terminal X1 and current output terminal X3，Described first current input terminal X1 is electrically connected with overvoltage protector (2) earth terminal of at least one secondary windings of PT (1),Described current output terminal X3 ground connection，Also include the current transformer L that primary side perception is connected between the first current input terminal X1 and current output terminal X3 on connecting line、Current transformer L secondary side two ends input dual-port with the exchange of full-wave rectifying circuit (31) and are connected，The direct current output dual-port of full-wave rectifying circuit (31) connects the coil two ends of an electric current relay K respectively，The normally opened contact both sides of electric current relay K connect the first signal output part X4 and secondary signal outfan X5，Described first signal output part X4 and secondary signal outfan X5 communicates to connect with monitoring system (4).
- Voltage transformer secondary side neutral point overvoltage protection action recording device the most according to claim 1; it is characterized in that; also include the second current input terminal mouth X2 for being directly connected to secondary windings of PT neutral point; inside device; second current input terminal X2 is in series with interior overvoltage protector, and is connected across on the connection line between the first current input terminal X1 summation current transformer L.
- Voltage transformer secondary side neutral point overvoltage protection action recording device the most according to claim 1 and 2, it is characterised in that the direct current output two ends of described full-wave rectifying circuit (31) are also parallel with adjustable resistance R.
- Voltage transformer secondary side neutral point overvoltage protection action recording device the most according to claim 1 and 2; it is characterized in that, between coil one end and the DC output end of full-wave rectifying circuit (31) of described electric current relay K, be also in series with the overvoltage enumerator P of statistics electric current relay K normally opened contact action frequency.
- Voltage transformer secondary side neutral point overvoltage protection action recording device the most according to claim 1 and 2, it is characterised in that described full-wave rectifying circuit (31) includes four diode composition rectification circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620243340.1U CN205720458U (en) | 2016-03-28 | 2016-03-28 | A kind of voltage transformer secondary side neutral point overvoltage protection action recording device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620243340.1U CN205720458U (en) | 2016-03-28 | 2016-03-28 | A kind of voltage transformer secondary side neutral point overvoltage protection action recording device |
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| CN205720458U true CN205720458U (en) | 2016-11-23 |
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| CN201620243340.1U Active CN205720458U (en) | 2016-03-28 | 2016-03-28 | A kind of voltage transformer secondary side neutral point overvoltage protection action recording device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196345A (en) * | 2019-07-09 | 2019-09-03 | 国网宁夏电力有限公司宁东供电公司 | Voltage transformer secondary neutral point protecting device |
| CN110542781A (en) * | 2018-05-28 | 2019-12-06 | 广东电网有限责任公司 | Current test analysis diagnosis device for CVT secondary voltage test device |
-
2016
- 2016-03-28 CN CN201620243340.1U patent/CN205720458U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542781A (en) * | 2018-05-28 | 2019-12-06 | 广东电网有限责任公司 | Current test analysis diagnosis device for CVT secondary voltage test device |
| CN110196345A (en) * | 2019-07-09 | 2019-09-03 | 国网宁夏电力有限公司宁东供电公司 | Voltage transformer secondary neutral point protecting device |
| CN110196345B (en) * | 2019-07-09 | 2024-06-04 | 国网宁夏电力有限公司宁东供电公司 | Secondary neutral point protection device of voltage transformer |
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