CN203205827U - Current transformer secondary overvoltage protection circuit - Google Patents
Current transformer secondary overvoltage protection circuit Download PDFInfo
- Publication number
- CN203205827U CN203205827U CN 201320112865 CN201320112865U CN203205827U CN 203205827 U CN203205827 U CN 203205827U CN 201320112865 CN201320112865 CN 201320112865 CN 201320112865 U CN201320112865 U CN 201320112865U CN 203205827 U CN203205827 U CN 203205827U
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- Prior art keywords
- current transformer
- transformer secondary
- unit
- overvoltage protection
- protection circuit
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Abstract
The utility model relates to a current transformer, and specifically discloses a current transformer secondary overvoltage protection circuit. The current transformer secondary overvoltage protection circuit is characterized in that the current transformer secondary overvoltage protection circuit comprises a signal comparison unit, and the current transformer secondary overvoltage protection circuit further comprises a voltage sampling unit and a reference voltage generator which are connected with the input end of the signal comparison unit separately, the current transformer secondary overvoltage protection circuit further comprises a protective action unit and a clock control unit which are connected with the output end of the signal comparison unit separately, and the voltage driving end of the clock control unit is connected with the signal end of the protective action unit; and the current transformer secondary overvoltage protection circuit further comprises a sound-light alarm output unit which is connected with the output end of the protective action unit. According to the utility model, compared with the prior art, measurement is performed on current transformer secondary voltages by adopting a pure analog circuit, so the safety and efficiency of the operation of the device can be improved, quick judgment is performed on current transformer secondary overvoltages and quick response is performed during the current transformer secondary side open-circuit process, the serviceability safety of other apparatus can be improved, and the automatic reset function can be realized.
Description
Technical field
The utility model relates to a kind of current transformer, specifically a kind of Current Transformer Secondary excess voltage protection.
Background technology
Current transformer (CT) is widely used in one-shot measurement and control in electric power system.During normal operation, Current Transformer Secondary side output voltage is very low.If but the secondary winding open circuit of being in operation, or a winding flows through abnormal current (such as lightning current, resonance overcurrent, capacitor charging electric current, inductance starting current etc.), all can produce at secondary side the overvoltage of thousands of volts even volts up to ten thousand.This not only works the mischief to electrical secondary system insulation, also can make the too drastic and scaling loss of instrument transformer, even the life security that jeopardizes the staff.The accident of using the Current Transformer Secondary overvoltage protection device just can effectively prevent the abnormal overvoltage of secondary side and causing.
And traditional Current Transformer Secondary overvoltage protection device adopts single-chip microcomputer that Current Transformer Secondary voltage is judged, processed; increased so undoubtedly the fault point of device; make device situation such as error in judgement, deadlock when needs are made action; bring loss to relevant device, impact is produced.
Summary of the invention
The utility model provides a kind of Current Transformer Secondary excess voltage protection in order to overcome the deficiencies in the prior art.
To achieve these goals, the utility model has designed a kind of Current Transformer Secondary excess voltage protection, it is characterized in that: comprise the signal comparing unit, also comprise the voltage sample unit and the reference voltage generator that are connected with signal comparing unit input respectively, also comprise the protection motor unit and the clock control cell that are connected with signal comparing unit output respectively, and the voltage drive end of clock control cell is connected with the signal end of protection motor unit; Also comprise a sound and light alarm output unit that is connected with protection motor unit output.
Described signal comparing unit is an AND circuit; The voltage sample unit connects the end current potential of AND circuit input, and the reference voltage generator connects the high potential of AND circuit input.
Described protection motor unit comprises two groups of contact switchs, and a relay that is used for the action of control contact switch.
Described clock control cell is the integrated circuit based on a NE555 chip.
Described sound and light alarm output unit comprises a light-emitting diode, and a voice guard.
The utility model is compared with prior art, adopt pure analog circuit that Current Transformer Secondary voltage is measured, safety and the efficient of device operation have been improved, the Current Transformer Secondary overvoltage is judged fast and responded fast when the Current Transformer Secondary side is opened a way, improve the safety that miscellaneous equipment uses, and have auto-reset function.
Description of drawings
Fig. 1 is schematic block circuit diagram of the present utility model.
Referring to Fig. 1,1 is the voltage sample unit; 2 is the reference voltage generator; 3 is the signal comparing unit; 4 are the protection motor unit; 5 is clock control cell; 6 is the sound and light alarm output unit.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, the utility model comprises signal comparing unit 3, also comprise the voltage sample unit 1 and the reference voltage generator 2 that are connected with signal comparing unit 3 inputs respectively, also comprise the protection motor unit 4 and the clock control cell 5 that are connected with signal comparing unit 3 outputs respectively, and the voltage drive end of clock control cell 5 is connected with the signal end of protection motor unit 4; Also comprise a sound and light alarm output unit 6 that is connected with protection motor unit 4 outputs.
Wherein, signal comparing unit 3 is an AND circuit; Voltage sample unit 1 connects the end current potential of AND circuit input, and reference voltage generator 2 connects the high potential of AND circuit input.
Protection motor unit bag 4 in the present embodiment is drawn together two groups of contact switchs, and a relay that is used for the action of control contact switch.Clock control cell 5 is the integrated circuit based on a NE555 chip.Sound and light alarm output unit 6 comprises a light-emitting diode, and a voice guard.
This device passes through voltage sample unit 1 with Current Transformer Secondary side voltage; its sampled value is inputed to signal comparing unit 3; and with reference voltage generator 2 relatively; if the voltage that voltage sample unit 1 collects is greater than reference voltage generator 2; signal comparing unit 3 output high level; if the voltage that voltage sample unit 1 collects is less than reference voltage generator 2; signal comparing unit 3 output low levels; comparator inputs to protection motor unit 4 with the high-low level signal; if high level; protection motor unit 4 is just had an effect; and sound and light alarm output unit 6 also gives the alarm; if low level, protection motor unit 4 and sound and light alarm output unit 6 all are failure to actuate.
5 pairs of circuit of clock control cell carry out timing reset.At this moment all protection motor unit 4 dead electricity lost efficacy, and sound and light alarm output unit 6 also dead electricity lost efficacy, and circuit gathers voltage to Current Transformer Secondary side voltage by voltage sample unit 1 again, and repeating as above, step operates.
Compare with prior art, adopt pure analog circuit that Current Transformer Secondary voltage is measured, safety and the efficient of device operation have been improved, the Current Transformer Secondary overvoltage is judged fast and responded fast when the Current Transformer Secondary side is opened a way, improve the safety that miscellaneous equipment uses, and have auto-reset function.
Claims (5)
1. Current Transformer Secondary excess voltage protection, it is characterized in that: comprise the signal comparing unit, also comprise the voltage sample unit and the reference voltage generator that are connected with signal comparing unit input respectively, also comprise the protection motor unit and the clock control cell that are connected with signal comparing unit output respectively, and the voltage drive end of clock control cell is connected with the signal end of protection motor unit; Also comprise a sound and light alarm output unit that is connected with protection motor unit output.
2. Current Transformer Secondary excess voltage protection according to claim 1, it is characterized in that: described signal comparing unit is an AND circuit; The voltage sample unit connects the end current potential of AND circuit input, and the reference voltage generator connects the high potential of AND circuit input.
3. Current Transformer Secondary excess voltage protection according to claim 1, it is characterized in that: described protection motor unit comprises two groups of contact switchs, and a relay that is used for the action of control contact switch.
4. Current Transformer Secondary excess voltage protection according to claim 1 is characterized in that: described clock control cell is the integrated circuit based on a NE555 chip.
5. Current Transformer Secondary excess voltage protection according to claim 1, it is characterized in that: described sound and light alarm output unit comprises a light-emitting diode, and a voice guard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320112865 CN203205827U (en) | 2013-03-13 | 2013-03-13 | Current transformer secondary overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320112865 CN203205827U (en) | 2013-03-13 | 2013-03-13 | Current transformer secondary overvoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203205827U true CN203205827U (en) | 2013-09-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320112865 Expired - Fee Related CN203205827U (en) | 2013-03-13 | 2013-03-13 | Current transformer secondary overvoltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203205827U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362587A (en) * | 2014-12-05 | 2015-02-18 | 安徽鑫龙电器股份有限公司 | Wiring loop high-voltage protection system of secondary current transformer |
| CN109995009A (en) * | 2019-05-23 | 2019-07-09 | 国网甘肃省电力公司兰州供电公司 | A kind of CT second open circuit protector based on Zinc-Oxide Arrester |
| CN113884747A (en) * | 2021-09-07 | 2022-01-04 | 中国电力科学研究院有限公司 | Overvoltage measuring device of electronic transformer |
-
2013
- 2013-03-13 CN CN 201320112865 patent/CN203205827U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362587A (en) * | 2014-12-05 | 2015-02-18 | 安徽鑫龙电器股份有限公司 | Wiring loop high-voltage protection system of secondary current transformer |
| CN104362587B (en) * | 2014-12-05 | 2017-11-03 | 安徽鑫龙电器股份有限公司 | A kind of secondary current mutual inductor interstar connection loop high-voltage protects system |
| CN109995009A (en) * | 2019-05-23 | 2019-07-09 | 国网甘肃省电力公司兰州供电公司 | A kind of CT second open circuit protector based on Zinc-Oxide Arrester |
| CN113884747A (en) * | 2021-09-07 | 2022-01-04 | 中国电力科学研究院有限公司 | Overvoltage measuring device of electronic transformer |
| CN113884747B (en) * | 2021-09-07 | 2023-12-26 | 中国电力科学研究院有限公司 | Overvoltage measuring device of electronic transformer |
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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 |
Granted publication date: 20130918 Termination date: 20190313 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |