CN205666609U - A protection circuit that is used for changeablely switching transformation ratio than current transformer - Google Patents
A protection circuit that is used for changeablely switching transformation ratio than current transformer Download PDFInfo
- Publication number
- CN205666609U CN205666609U CN201620541965.6U CN201620541965U CN205666609U CN 205666609 U CN205666609 U CN 205666609U CN 201620541965 U CN201620541965 U CN 201620541965U CN 205666609 U CN205666609 U CN 205666609U
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- current transformer
- protection circuit
- load voltage
- variable specific
- voltage ratio
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Abstract
The utility model discloses a protection circuit that is used for changeablely switching transformation ratio than current transformer, including the changeable current transformer that compares, it is changeable than the parallelly connected composite set who has silicon bidirection switch and current -limiting resistor among current transformer's the secondary circuit, silicon bidirection switch and current -limiting resistor establish ties. The utility model discloses a protection circuit can make that this kind of operation leads to the fact extra -high voltage current potential produced in the twinkling of an eye quick disappearance the through silicon bidirection switch's intercommunication rapidly when reaching certain voltage of opening a way, and when being transformed into another transformation ratio position, owing to there is not the extra -high voltage current potential, silicon bidirection switch will automatic tripping, recovers the open -circuit condition.
Description
Technical field
This utility model relates to a kind of protection circuit for variable specific current transformer switching no-load voltage ratio.
Background technology
The variable specific current transformer being in operation of prior art must in the event of a loss of power, and ability switching current is mutual
The no-load voltage ratio of sensor, otherwise the moment at open circuit of secondary loop of current transformer can produce the spike spy of multiple contrary with current ratio
High potential, seriously jeopardizes the safety of equipment and life.
Utility model content
(1) to solve the technical problem that
The purpose of this utility model seeks to overcome disadvantages mentioned above, it is desirable to provide a kind of variable specific current transformer that is used for is cut
The protection circuit of transformation ratio.
(2) technical scheme
For reaching above-mentioned purpose, the protection circuit for variable specific current transformer switching no-load voltage ratio of the present utility model, bag
Include variable specific current transformer, silicon bilateral switch in parallel and current-limiting resistance in the secondary circuit of described variable specific current transformer
Combination unit.
Further, described silicon bilateral switch and current-limiting resistance series connection, the characteristic of described silicon bilateral switch and parameter and current limliting
Characteristic and the parameter of resistance are mutually matched.
Further, described combination unit is in parallel with each no-load voltage ratio loop of variable specific current transformer.
Further, described variable specific current transformer also includes short-circuited terminal, and when connecting short-circuited terminal, short circuit is many immediately
Each no-load voltage ratio loop of transformation ratio current transformer.
(3) beneficial effect
Compared with prior art, the technical solution of the utility model has the advantage that protection circuit of the present utility model
Extra-high voltage electromotive force produced by the open circuit moment that this operation causes can be made to reach to run through during certain voltage silicon two-way opened
The connection closed and quick disappearance, and when being transformed into another no-load voltage ratio position, owing to there is no extra-high voltage electromotive force, silicon bilateral switch understand again from
Dynamic tripping, returns to open-circuit condition；Revolutionize present variable specific current transformer can not be in operation switching current no-load voltage ratio
Present situation, can be in operation switching current no-load voltage ratio the most at any time, simplifies operation sequence, improves the reliable of power supply order
Property, safety.
Accompanying drawing explanation
Fig. 1 is the electricity that the protection circuit for variable specific current transformer switching no-load voltage ratio of the present utility model connects terminal 1
Road schematic diagram；
Fig. 2 is the electricity that the protection circuit for variable specific current transformer switching no-load voltage ratio of the present utility model connects terminal 2
Road schematic diagram；
Fig. 3 is the electricity that the protection circuit for variable specific current transformer switching no-load voltage ratio of the present utility model connects terminal 3
Road schematic diagram；
Fig. 4 is the electricity that the protection circuit for variable specific current transformer switching no-load voltage ratio of the present utility model connects terminal 4
Road schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, detailed description of the invention of the present utility model is described in further detail.Below
Embodiment is used for illustrating this utility model, but is not limited to scope of the present utility model.
As Figure 1-3, the protection circuit for variable specific current transformer switching no-load voltage ratio of the present utility model, including many
Transformation ratio current transformer CT, is parallel with silicon bilateral switch SIDAC and limit in the secondary circuit of described variable specific current transformer CT
The combination unit of leakage resistance R；Described silicon bilateral switch SIDAC and current-limiting resistance R series connection.
The characteristic of described silicon bilateral switch SIDAC and parameter are mutually matched with characteristic and the parameter of current-limiting resistance R.
Described combination unit is in parallel with each no-load voltage ratio loop of variable specific current transformer CT, i.e. polytropic ratio electric current is mutual
Sensor CT has multiple tap as no-load voltage ratio loop, and the corresponding connection end of each tap completes mutual inductance by switching switch K
The switching (i.e. the most corresponding in figure numeral 1,2,3 end) of device no-load voltage ratio.
Wherein, variable specific current transformer CT also includes short-circuited terminal 4, when switching switch K connects short-circuited terminal 4, vertical
Each no-load voltage ratio loop of i.e. short circuit variable specific current transformer CT, eliminates variable specific current transformer CT and crosses stream, short circuit current
Trip protection function, i.e. electric current not from Fig. 4 ammeter flow through.
Protection circuit of the present utility model is when switching no-load voltage ratio, and switching switchs extra-high voltage electromotive force produced by K open circuit moment
Reach to run through the connection of silicon bilateral switch SIDAC during certain voltage and quick disappearance, and when being transformed into another no-load voltage ratio position,
Owing to there is no extra-high voltage electromotive force, silicon bilateral switch SIDAC again can tripping automatically, return to open-circuit condition.
Protection circuit of the present utility model can make produced by the secondary circuit open circuit moment that this operation causes extra-high
Piezoelectricity gesture reaches to run through the connection of silicon bilateral switch during certain voltage and quick disappearance, and is transformed into another no-load voltage ratio position
Time, owing to there is no extra-high voltage electromotive force, silicon bilateral switch again can tripping automatically, return to open-circuit condition；Revolutionize the most
Transformation ratio current transformer can not be in operation the present situation of switching current no-load voltage ratio, and can be in operation switching current the most at any time
No-load voltage ratio, simplifies operation sequence, improves the power supply reliability of order, safety.
In sum, above-mentioned embodiment is not restricted embodiment of the present utility model, the technology of all this areas
Modification that personnel are carried out on the basis of flesh and blood of the present utility model or equivalent deformation, all in skill of the present utility model
Art category.
Claims (4)
1. the protection circuit for variable specific current transformer switching no-load voltage ratio, it is characterised in that: include that polytropic ratio electric current is mutual
Sensor, silicon bilateral switch in parallel and the combination unit of current-limiting resistance in the secondary circuit of described variable specific current transformer.
2. the protection circuit for variable specific current transformer switching no-load voltage ratio as claimed in claim 1, it is characterised in that: described
Silicon bilateral switch and current-limiting resistance series connection, the characteristic of described silicon bilateral switch and parameter are phases with characteristic and the parameter of current-limiting resistance
Mate mutually.
3. the protection circuit for variable specific current transformer switching no-load voltage ratio as claimed in claim 1 or 2, it is characterised in that:
Described combination unit is in parallel with each no-load voltage ratio loop of variable specific current transformer.
4. the protection circuit for variable specific current transformer switching no-load voltage ratio as claimed in claim 3, it is characterised in that: described
Variable specific current transformer also includes short-circuited terminal, and when connecting short-circuited terminal, short circuit variable specific current transformer is each immediately
Individual no-load voltage ratio loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620541965.6U CN205666609U (en) | 2016-06-03 | 2016-06-03 | A protection circuit that is used for changeablely switching transformation ratio than current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620541965.6U CN205666609U (en) | 2016-06-03 | 2016-06-03 | A protection circuit that is used for changeablely switching transformation ratio than current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205666609U true CN205666609U (en) | 2016-10-26 |
Family
ID=57156239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620541965.6U Active CN205666609U (en) | 2016-06-03 | 2016-06-03 | A protection circuit that is used for changeablely switching transformation ratio than current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205666609U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802476A (en) * | 2018-06-13 | 2018-11-13 | 贵州电网有限责任公司 | A kind of DC current transformer and its current test method |
| CN111736011A (en) * | 2020-05-19 | 2020-10-02 | 南方电网科学研究院有限责任公司 | Controllable zero sequence current transformer |
| CN113777379A (en) * | 2021-08-24 | 2021-12-10 | 山东亿玛信诺电气有限公司 | Precise metering current transformer and manufacturing method of double-magnetic-circuit current transformer |
-
2016
- 2016-06-03 CN CN201620541965.6U patent/CN205666609U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802476A (en) * | 2018-06-13 | 2018-11-13 | 贵州电网有限责任公司 | A kind of DC current transformer and its current test method |
| CN111736011A (en) * | 2020-05-19 | 2020-10-02 | 南方电网科学研究院有限责任公司 | Controllable zero sequence current transformer |
| CN113777379A (en) * | 2021-08-24 | 2021-12-10 | 山东亿玛信诺电气有限公司 | Precise metering current transformer and manufacturing method of double-magnetic-circuit current transformer |
| CN113777379B (en) * | 2021-08-24 | 2024-03-22 | 山东亿玛信诺电气有限公司 | Accurate metering current transformer and manufacturing method of double-magnetic-circuit current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |