CN104901296A - Secondary overvoltage protection device for current transformer - Google Patents
Secondary overvoltage protection device for current transformer Download PDFInfo
- Publication number
- CN104901296A CN104901296A CN201510320390.5A CN201510320390A CN104901296A CN 104901296 A CN104901296 A CN 104901296A CN 201510320390 A CN201510320390 A CN 201510320390A CN 104901296 A CN104901296 A CN 104901296A
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- China
- Prior art keywords
- current transformer
- circuit
- protection device
- overvoltage
- logic control
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Abstract
The invention discloses a secondary overvoltage protection device for a current transformer, and relates to the technical field of overvoltage absorption of a power system. The device comprises a logic control circuit, an overvoltage detection circuit, and a silicon controlled rectifier protection apparatus, wherein one end of the logic control circuit is connected with one end of the silicon controlled rectifier protection apparatus 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 rectifier protection apparatus is connected with one end of the overvoltage detection circuit and the other end of the current transformer. The other end of the overvoltage detection circuit is connected with the other end of the circuit load. The device provided by the invention is high in action speed, is strong in overload capability, is small in static leaked current, and can meet the protection demands of various types 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 |
|---|---|---|---|
| CN201510320390.5A CN104901296A (en) | 2015-06-12 | 2015-06-12 | Secondary overvoltage protection device for current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510320390.5A CN104901296A (en) | 2015-06-12 | 2015-06-12 | Secondary overvoltage protection device for current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104901296A true CN104901296A (en) | 2015-09-09 |
Family
ID=54033787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510320390.5A Pending CN104901296A (en) | 2015-06-12 | 2015-06-12 | Secondary overvoltage protection device for current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104901296A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN104868459A (en) * | 2015-06-01 | 2015-08-26 | 安徽禄讯电子科技有限公司 | Secondary overvoltage protector for current transformer |
| CN105098750A (en) * | 2014-11-18 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | Secondary overvoltage protection device of current transformer |
-
2015
- 2015-06-12 CN CN201510320390.5A patent/CN104901296A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105098750A (en) * | 2014-11-18 | 2015-11-25 | 芜湖蓝宙电子科技有限公司 | Secondary overvoltage protection device of current transformer |
| 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 |
| CN104868459A (en) * | 2015-06-01 | 2015-08-26 | 安徽禄讯电子科技有限公司 | Secondary overvoltage protector 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 |
Application publication date: 20150909 |