CN105098750A - Secondary overvoltage protection device of current transformer - Google Patents
Secondary overvoltage protection device of current transformer Download PDFInfo
- Publication number
- CN105098750A CN105098750A CN201410656353.7A CN201410656353A CN105098750A CN 105098750 A CN105098750 A CN 105098750A CN 201410656353 A CN201410656353 A CN 201410656353A CN 105098750 A CN105098750 A CN 105098750A
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- China
- Prior art keywords
- protection device
- current transformer
- circuit
- overvoltage
- logic control
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Abstract
The invention provides a secondary overvoltage protection device of a current transformer and relates to the technical field of electric power system overvoltage absorption. The secondary overvoltage protection device of the current transformer comprises a logic control circuit, an overvoltage detection circuit and a silicon controlled rectifier protection device. One end of the logic control circuit is connected with one end of the silicon controlled rectifier protection device and one end of the current transformer, and the other end of the logic control circuit is connected with one end of a circuit load. The other end of the silicon-controlled silicon controlled rectifier protection device is connected with one end of the overvoltage detection circuit and the other end of the circuit transformer. The other end of the overvoltage detection circuit is connected with the other end of the circuit load. The overvoltage protection device provided by the invention is high in action speed, high in overloading capability, small in static leakage current and capable of meeting protection requirements of various kinds of current transformers.
Description
Technical field
The present invention relates to Hyper-Voltage of Power Systems absorption techniques field, particularly relate to a kind of Current Transformer Secondary overvoltage protection device.
Background technology
Current transformer is moved in one-shot measurement and control widely in electric power system, if there is secondary winding open circuit in current transformer or first side winding flows through abnormal current in running, as thunderbolt, resonance current, electrothermal charging current etc., capital produces the high pressure of thousands of volt volt even up to ten thousand at secondary side, this not only works the mischief to electrical secondary system insulation, goes back the life of entail dangers to staff.
Summary of the invention
The object of this invention is to provide a kind of Current Transformer Secondary overvoltage protection device, its quick action, overload capacity is strong, and static leakage current is little, can meet the protection demand of various current transformer.
In order to solve problem existing in background technology; the present invention is by the following technical solutions: it comprises logic control circuit, overvoltage detection circuit, thyristor protection device; described summation current transformer one end, logic control circuit one termination thyristor protection device one end; other end connection circuit load one end; the thyristor protection device other end takes over summation current transformer one end, voltage detecting circuit one end other end, the overvoltage detection circuit other end connection circuit load other end.
Current Transformer Secondary overvoltage protection device of the present invention is mainly used in the abnormal overvoltage protection of various CT secondary side, protector is fixed in CT secondary winding two ends, during normal operation, leakage current is minimum, in high-impedance state, when there is abnormal overcurrent in CT secondary circuit open circuit or a winding, the voltage that secondary winding produces is far away higher than normal operating voltage, the now rapid action of protector and short circuit, panel shows the position of fault, and export with or without source contact signal, after failture evacuation, by manual reset button, again normal operation input work after circuit reinstatement state.
System overvoltage restraining device of the present invention, its quick action, overload capacity is strong, and static leakage currents is little, can meet the protection demand of various current transformer.
Accompanying drawing explanation
Fig. 1 is electrical schematic diagram of the present invention.
Embodiment
See Fig. 1; a kind of Current Transformer Secondary overvoltage protection device; it comprises logic control circuit, overvoltage detection circuit, thyristor protection device; described summation current transformer one end, logic control circuit one termination thyristor protection device one end; other end connection circuit load one end; the thyristor protection device other end takes over summation current transformer one end, voltage detecting circuit one end other end, the overvoltage detection circuit other end connection circuit load other end.
Current Transformer Secondary overvoltage protection device of the present invention is mainly used in the abnormal overvoltage protection of various CT secondary side, protector is fixed in CT secondary winding two ends, during normal operation, leakage current is minimum, in high-impedance state, when there is abnormal overcurrent in CT secondary circuit open circuit or a winding, the voltage that secondary winding produces is far away higher than normal operating voltage, the now rapid action of protector and short circuit, panel shows the position of fault, and export with or without source contact signal, after failture evacuation, by manual reset button, again normal operation input work after circuit reinstatement state.
System overvoltage restraining device of the present invention, its quick action, overload capacity is strong, and static leakage currents is little, can meet the protection demand of various current transformer.
Claims (1)
1. Current Transformer Secondary overvoltage protection device; it is characterized in that; it comprises logic control circuit, overvoltage detection circuit, thyristor protection device; described summation current transformer one end, logic control circuit one termination thyristor protection device one end; other end connection circuit load one end; the thyristor protection device other end takes over summation current transformer one end, voltage detecting circuit one end other end, the overvoltage detection circuit other end connection circuit load other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410656353.7A CN105098750A (en) | 2014-11-18 | 2014-11-18 | Secondary overvoltage protection device of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410656353.7A CN105098750A (en) | 2014-11-18 | 2014-11-18 | Secondary overvoltage protection device of current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105098750A true CN105098750A (en) | 2015-11-25 |
Family
ID=54578622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410656353.7A Pending CN105098750A (en) | 2014-11-18 | 2014-11-18 | Secondary overvoltage protection device of current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105098750A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836201A (en) * | 2015-06-01 | 2015-08-12 | 合肥扬帆通信元器件有限公司 | Secondary overvoltage protection device of current transformer |
| CN104901296A (en) * | 2015-06-12 | 2015-09-09 | 合肥市徽腾网络科技有限公司 | Secondary overvoltage protection device for current transformer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202797943U (en) * | 2012-08-30 | 2013-03-13 | 宁波德沃电气有限公司 | Secondary overvoltage protector of combined current transformer |
| CN203278215U (en) * | 2013-01-22 | 2013-11-06 | 合肥隆科电力设备有限责任公司 | Secondary overvoltage protector for current transformer |
-
2014
- 2014-11-18 CN CN201410656353.7A patent/CN105098750A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202797943U (en) * | 2012-08-30 | 2013-03-13 | 宁波德沃电气有限公司 | Secondary overvoltage protector of combined current transformer |
| CN203278215U (en) * | 2013-01-22 | 2013-11-06 | 合肥隆科电力设备有限责任公司 | Secondary overvoltage protector for current transformer |
Non-Patent Citations (1)
| Title |
|---|
| 李谦等: "电压互感器二次回路中性点安装过电压保护的必要性研究———二次回路中性点雷电传递过电压的试验和计算分析", 《广东电力》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836201A (en) * | 2015-06-01 | 2015-08-12 | 合肥扬帆通信元器件有限公司 | Secondary overvoltage protection device of current transformer |
| CN104901296A (en) * | 2015-06-12 | 2015-09-09 | 合肥市徽腾网络科技有限公司 | Secondary overvoltage protection device for current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151125 |