CN207925288U - A kind of quick response from short circuit current mutual inductor - Google Patents
A kind of quick response from short circuit current mutual inductor Download PDFInfo
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- CN207925288U CN207925288U CN201721354514.2U CN201721354514U CN207925288U CN 207925288 U CN207925288 U CN 207925288U CN 201721354514 U CN201721354514 U CN 201721354514U CN 207925288 U CN207925288 U CN 207925288U
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Abstract
The utility model discloses a kind of quick responses from short circuit current mutual inductor; including iron core, input circuit coil, output loop coil, sampling compensation circuit coil and open-circuit-protection circuit coil; the input circuit coil, output loop coil, sampling compensation circuit coil and open-circuit-protection circuit coil are wound on iron core, and the turn ratio of open-circuit-protection circuit coil and input circuit coil is (10~100)：1, concatenate a relay on the open-circuit-protection circuit coil, one sampling compensation protective device of connection on the sampling compensation circuit coil, relay is electrically connected with sampling compensation protective device.The utility model is by increasing an open-circuit-protection circuit coil; when having detected open-circuit condition; the direct short circuit open-circuit-protection circuit coil of relay; since the electric current of input circuit coil is smaller; relay only needs to use low current relay; fast and high sensitivity is reacted, substantially increases the reliability of current transformer, while reducing cost.
Description
【Technical field】
The utility model is related to the technical field of current transformer, more particularly to a kind of quick response it is mutual from short circuit current
Sensor.
【Background technology】
Primary side high current is converted into secondary side low current to measure by current transformer according to electromagnetic induction principle
Instrument, current transformer are made of the iron core and winding being closed.Its first side winding the number of turns is seldom, and string is measured in needs
In the circuit of electric current, therefore primary side often has whole electric currents of circuit to flow through, and secondary side winding turn ratio is more, is serially connected in survey
It measures in instrument and protective loop.The effect of current transformer includes：1) high voltage of primary circuit and high current are become secondary
The low-voltage and low current of loop standard make measuring instrumentss and protective device standardize, miniaturization, and make its light structure, valence
Lattice are cheap, and convenient for installation in screen；2) high-tension circuit is isolated.Mutual inductor primary side and secondary side not electric contact, only magnetic
Contact, so that secondary device is isolated with high voltage part, and mutual inductor secondary side is grounded, to ensure that equipment and the person
Safety.
In isopotential electrical current transformer, since current transformer is 1：1 output, so output is high current, one
As be all to install an open-circuit-protection for carrying out using the relay of high current output loop additional in current output terminal, such as Fig. 1 institutes
Show.And high-current relay reacts slow motion, sensitivity is low and of high cost, reduces the reliability of product.More than solving
Problem, it is necessary to propose a kind of quick response from short circuit current mutual inductor.
【Utility model content】
The purpose of the utility model is to overcome above-mentioned the deficiencies in the prior art, provide a kind of quick response from short circuit electricity
Current transformer aims to solve the problem that and usually installs a use additional in current output terminal in isopotential electrical current transformer in the prior art
The relay of high current carries out the open-circuit-protection of output loop, and high-current relay has reaction slow motion, and sensitivity is low
And technical problem of high cost.
To achieve the above object, the utility model proposes a kind of quick responses from short circuit current mutual inductor, including iron
Core, input circuit coil, output loop coil, sampling compensation circuit coil and open-circuit-protection circuit coil, the input are returned
Road coil, output loop coil, sampling compensation circuit coil and open-circuit-protection circuit coil are wound on iron core, and described is defeated
The turn ratio of entry loop coil and output loop coil is 1：1, the open-circuit-protection circuit coil and input circuit coil
Turn ratio is (10~100)：1, a relay is concatenated on the open-circuit-protection circuit coil, the sampling compensates return line
One sampling compensation protective device of connection, the relay are electrically connected with sampling compensation protective device on circle.
Preferably, the turn ratio of the open-circuit-protection circuit coil and input circuit coil is 100：1, it is described after
Electric appliance fast, high sensitivity low current relay using reaction.
Preferably, the sampling compensation circuit coil includes sampling circuit coil and compensation circuit coil, it is described
Sampling circuit coil and compensation circuit coil are electrically connected with sampling compensation protective device.
Preferably, the iron core is annular core.
Preferably, the input circuit coil, sampling compensate circuit coil, open-circuit-protection circuit coil and export back
Road coil sequentially coiling on iron core.
The beneficial effects of the utility model：Compared with prior art, a kind of quick response provided by the utility model from
Short circuit current mutual inductor, by increasing an open-circuit-protection circuit coil, and the number of turns of open-circuit-protection circuit coil is far more than defeated
The number of turns of entry loop coil, therefore, the electric current of input circuit coil are smaller, when having detected open-circuit condition, sampling compensation
Protective device is closed to one closure signal of relay on open-circuit-protection circuit coil by relay, direct short circuit open circuit
Protective loop coil reaches open-circuit-protection effect, since the electric current of open-circuit-protection circuit coil is smaller, relay only needs
Low current relay is used, fast and high sensitivity is reacted, substantially increases the reliability of current transformer, reduce simultaneously
Cost.
The feature and advantage of the utility model will be described in detail by embodiment combination attached drawing.
【Description of the drawings】
Fig. 1 is the schematic diagram of traditional isopotential electrical current transformer；
Fig. 2 is a kind of schematic diagram from short circuit current mutual inductor of quick response of the utility model embodiment.
In figure：1- iron cores, 2- input circuits coil, 3- output loops coil, 4- open-circuit-protections circuit coil, 5- relays
Device, 6- sampling compensation protective device, 7- sampling circuits coil, 8- compensate circuit coil.
【Specific implementation mode】
To make the objectives, technical solutions and advantages of the present invention clearer, below by accompanying drawings and embodiments,
The present invention will be further described in detail.However, it should be understood that specific embodiment described herein is only used to solve
The utility model is released, the range being not intended to limit the utility model.In addition, in the following description, being omitted to known features
With the description of technology, to avoid the concept of the utility model is unnecessarily obscured.
Referring to Fig.2, the utility model embodiment provide a kind of quick response from short circuit current mutual inductor, including iron core 1,
Input circuit coil 2, output loop coil 3, sampling compensation circuit coil and open-circuit-protection circuit coil 4, the input are returned
Road coil 2, output loop coil 3, sampling compensation circuit coil and open-circuit-protection circuit coil 4 are wound on iron core 1, described
The turn ratio of input circuit coil 2 and output loop coil 3 be 1：1, the open-circuit-protection circuit coil 4 and input circuit
The turn ratio of coil 2 is (10~100)：1, a relay 5, the sampling are concatenated on the open-circuit-protection circuit coil 4
One sampling compensation protective device 6 of connection, the relay 5 on circuit coil is compensated with sampling compensation protective device 6 electrically to connect
It connects.
Further, the turn ratio of the open-circuit-protection circuit coil 4 and input circuit coil 2 is 100：1, therefore
Electric current in open-circuit-protection circuit coil 4 only has 1% of actual current in input circuit coil 2, thus relay 5 may be used
Fast, high sensitivity low current relay is reacted, solves the relay needed in traditional open-circuit-protection mode using high current
Device has that low-response, sensitivity are low, improves the reliability of product.
Further, sampling compensation circuit coil includes sampling circuit coil 7 and compensates circuit coil 8, described
Sampling circuit coil 7 and compensation circuit coil 8 with sampling compensation protective device 6 be electrically connected.
Further, the iron core 1 is annular core, the input circuit coil 2, sampling compensation return line
Circle, the sequentially coiling on iron core 1 of open-circuit-protection circuit coil 4 and output loop coil 3.
Utility model works process：
A kind of quick response of the utility model from short circuit current mutual inductor during the work time, pass through increase by one open circuit
Protective loop coil 4, and therefore the number of turns of the number of turns of open-circuit-protection circuit coil 4 far more than input circuit coil 2 inputs back
The electric current of road coil 2 is smaller, it is preferable that 4 the number of turns of open-circuit-protection circuit coil：2 the number of turns of input circuit coil is 100：1, therefore open
Electric current in road protective loop coil 4 is only 1% of actual current in input circuit coil 2, and sampling circuit coil 7 acquires mutual inductance
Electric signal is sent to sampling compensation protective device 6, and carries out signal compensation by compensation circuit coil 8 by the electric signal in device, by
Electric signal after the sampling compensation analysis compensation of protective device 6, needs the requirement opened a way (opening a way if the electric current in mutual inductor reaches
When state), sampling compensation protective device 6 to 5 one closure signal of relay on open-circuit-protection circuit coil 4, by relay 5 into
Row is closed, and direct short circuit open-circuit-protection circuit coil 4 reaches open-circuit-protection effect, due to the electric current of open-circuit-protection circuit coil 4
Smaller, therefore, relay 5 only needs to use low current relay, reacts fast and high sensitivity, it is mutual to substantially increase electric current
The reliability of sensor, while reducing cost.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Any modification, equivalent replacement or improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (5)
1. a kind of quick response from short circuit current mutual inductor, it is characterised in that：Including iron core (1), input circuit coil (2),
Output loop coil (3), sampling compensation circuit coil and open-circuit-protection circuit coil (4), the input circuit coil (2),
Output loop coil (3), sampling compensation circuit coil and open-circuit-protection circuit coil (4) are wound on iron core (1), described
The turn ratio of input circuit coil (2) and output loop coil (3) is 1：1, the open-circuit-protection circuit coil (4) with input
The turn ratio of circuit coil (2) is (10~100)：1, a relay (5) is concatenated on the open-circuit-protection circuit coil (4),
One sampling compensation protective device (6) of connection on the sampling compensation circuit coil, the relay (5) are protected with sampling compensation
Protection unit (6) is electrically connected.
2. a kind of quick response as described in claim 1 from short circuit current mutual inductor, it is characterised in that：The open circuit is protected
The turn ratio for protecting circuit coil (4) and input circuit coil (2) is 100：1, the relay (5) is fast, sensitive using reaction
Spend high low current relay.
3. a kind of quick response as described in claim 1 from short circuit current mutual inductor, it is characterised in that：The sampling is mended
It includes sampling circuit coil (7) and compensation circuit coil (8) to repay circuit coil, the sampling circuit coil (7) and is compensated back
Road coil (8) is electrically connected with sampling compensation protective device (6).
4. a kind of quick response as described in claim 1 from short circuit current mutual inductor, it is characterised in that：The iron core
(1) it is annular core.
5. a kind of quick response as described in claim 1 from short circuit current mutual inductor, it is characterised in that：The input is returned
Road coil (2), sampling compensation circuit coil, open-circuit-protection circuit coil (4) and output loop coil (3) are suitable on iron core (1)
Secondary coiling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721354514.2U CN207925288U (en) | 2017-10-20 | 2017-10-20 | A kind of quick response from short circuit current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721354514.2U CN207925288U (en) | 2017-10-20 | 2017-10-20 | A kind of quick response from short circuit current mutual inductor |
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| Publication Number | Publication Date |
|---|---|
| CN207925288U true CN207925288U (en) | 2018-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721354514.2U Active CN207925288U (en) | 2017-10-20 | 2017-10-20 | A kind of quick response from short circuit current mutual inductor |
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| Country | Link |
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| CN (1) | CN207925288U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112331466A (en) * | 2020-10-31 | 2021-02-05 | 贵州电网有限责任公司 | Current transformer with short-circuit module |
-
2017
- 2017-10-20 CN CN201721354514.2U patent/CN207925288U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112331466A (en) * | 2020-10-31 | 2021-02-05 | 贵州电网有限责任公司 | Current transformer with short-circuit module |
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