CN106532640A - Secondary side open circuit protection device of current transformer - Google Patents
Secondary side open circuit protection device of current transformer Download PDFInfo
- Publication number
- CN106532640A CN106532640A CN201610951138.9A CN201610951138A CN106532640A CN 106532640 A CN106532640 A CN 106532640A CN 201610951138 A CN201610951138 A CN 201610951138A CN 106532640 A CN106532640 A CN 106532640A
- Authority
- CN
- China
- Prior art keywords
- resistance
- current transformer
- secondary side
- controllable silicon
- silicon scr
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a secondary side open circuit protection device of a current transformer. The secondary side open circuit protection device of the current transformer comprises a first protection unit, a second protection unit and a detection and control unit, wherein the first protection unit and the second protection unit are connected to two ends of a secondary side coil of the current transformer and connected to a load RL of a secondary side of the current transformer to form a parallel structure; and an input end of the detection and control unit is connected with the first protection unit and an output end of the detection and control unit is connected with a control terminal of the second protection unit. A protection execution action can be timely made when an open circuit appears in the secondary side of the current transformer, so that the damage to the current transformer or the load caused by a protection execution delay is effectively avoided; the service life of the current transformer is effectively ensured; and the secondary side open circuit protection device is simple in structure, high in stability and convenient to maintain.
Description
Technical field
The present invention relates to a kind of current transformer protection equipment, more particularly to a kind of Current Transformer Secondary side open-circuit-protection
Device.
Background technology
Current transformer is widely used in the middle of power system, measurement, protection and control such as to circuit etc., according to electricity
The characteristic of current transformer, current transformer in use when forbid secondary side open circuit, this be due to secondary side open a way shape
Under state, the electric current of the primary side of current transformer is completely used for excitation and causes the core sataration of current transformer so as to mutual in electric current
The secondary side of sensor induces high pressure, so as to bring serious harm.
The secondary side open-circuit-protection measure of current transformer in prior art has the disadvantage that：One side prior art is past
Toward adopting the modes such as electric current, voltage to be judged, protection is performed by protection circuit then, response speed is slow, working as often occurs in Jing
The load of current transformer or current transformer when protection equipment performs protection has been damaged, so as to cause irremediable damage
Lose；On the other hand, the protected mode complex structure of prior art, is unfavorable for safeguarding, so as to cause stability poor.
It is, therefore, desirable to provide a kind of new secondary side open circuit protecting equipment of current mutual inductor, can be in current transformer two
Secondary side occurs making protection execution action during open circuit in time, so as to be prevented effectively from perform protection time delay cause current transformer or
Load is damaged, and effectively guarantees the service life of current transformer, and simple structure, and stability is strong, maintains easily.
The content of the invention
In view of this, it is an object of the invention to provide a kind of secondary side open circuit protecting equipment of current mutual inductor, can be in electricity
Current transformer secondary side occurs making protection execution action during open circuit in time, protects time delay to cause electric current so as to be prevented effectively to perform
Transformer or load are damaged, and effectively guarantee the service life of current transformer, and simple structure, and stability is strong, convenient to tie up
Shield.
To achieve these goals, a kind of secondary side open circuit protecting equipment of current mutual inductor that the present invention is provided includes first
Protection location, the second protection location and detection control unit；
First protection location and the second protection location are all connected to the two ends of Current Transformer Secondary lateral coil, and
One protection location and the second protection location are in parallel with the load RL of Current Transformer Secondary side, the detection control unit it is defeated
Enter end to be connected with the first protection location, the output end of the detection control unit is connected with the control end of the second protection location.
Preferred version, first protection location include two-way Transient Suppression Diode TVS1 and resistance R1；
One end of the two-way Transient Suppression Diode TVS1 is connected to one end of Current Transformer Secondary lateral coil, two-way
The other end of Transient Suppression Diode TVS1 is connected with one end of resistance R1, the other end and the Current Transformer Secondary side of resistance R1
The other end of coil connects and is grounded.
Preferred version, the detection control unit include resistance R2, resistance R3, resistance R5, resistance R7, resistance R8, electric capacity
C1, metal-oxide-semiconductor Q1 and controllable silicon SCR 2；
One end of the resistance R2 is connected to the points of common connection between two-way Transient Suppression Diode TVS1 and resistance R1,
The other end of resistance R2 is connected with one end of resistance R3, the other end ground connection of resistance R3；The one of the grid and electric capacity C1 of metal-oxide-semiconductor Q1
End is connected with the points of common connection of the resistance R2 and resistance R3, one end of the drain electrode of the metal-oxide-semiconductor Q1 and the resistance R8
Connection, the other end external power supply VCC of resistance R8, the source electrode of metal-oxide-semiconductor Q1 are connected with one end of the resistance R5, and resistance R5's is another
One end is connected and is grounded with the other end of the other end and resistance R3 of the electric capacity C1；The anode of the controllable silicon SCR 2 is connected to
Power supply VCC, the negative electrode of controllable silicon SCR 2 are connected with one end of resistance R7, the other end ground connection of resistance R7；The control of controllable silicon SCR 2
Pole processed is connected to the drain electrode of metal-oxide-semiconductor Q1, and the negative electrode of controllable silicon SCR 2 is single with the second protection as the output end of detection control unit
The control end connection of unit.
Preferred version, second protection location include controllable silicon SCR 1 and resistance R6, the anode of the controllable silicon SCR 1
One end of Current Transformer Secondary lateral coil is connected to, the negative electrode of controllable silicon SCR 1 is connected with one end of resistance R6, resistance R6's
The other end is connected and is grounded with the other end of Current Transformer Secondary lateral coil, and the control pole of controllable silicon SCR 1 is used as the second protection
The control end of unit is connected with the output end of detection control unit.Resistance of the resistance of the resistance R6 less than resistance R1.
Preferred version, the secondary side open circuit protecting equipment of current mutual inductor also include police instruction unit, and the warning refers to
Show that unit includes electric capacity C2, LED 1 and resistance R4；The positive pole and controllable silicon of the LED 1
One end of the negative electrode, one end of resistance R7 and electric capacity C2 of SCR2 is all connected with, the negative pole of LED 1 and the one of resistance R4
End connection, the other end of resistance R4 are connected and are grounded with the other end of the other end of resistance R7 and electric capacity C2.
Switch S1 is provided between the anode and power supply VCC of the controllable silicon SCR 2.
Beneficial effects of the present invention：The secondary side open circuit protecting equipment of current mutual inductor of the present invention, can be in Current Mutual Inductance
Device secondary side occurs making protection execution action during open circuit in time, protects time delay to cause current transformer so as to be prevented effectively to perform
Or load is damaged, the service life of current transformer, and simple structure are effectively guaranteed, stability is strong, maintains easily.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples：
Fig. 1 is the circuit theory schematic diagram of the present invention.
Specific embodiment
Fig. 1 is the circuit theory diagrams of the present invention, as illustrated, a kind of Current Transformer Secondary side open circuit that the present invention is provided
Protection device, including the first protection location 1, the second protection location 2 and detection control unit 3；
First protection location 1 and the second protection location 2 are all connected to the two ends of the second siding ring of current transformer 4
And first protection location 1 and the second protection location 2 form parallel-connection structure, institute with the load RL of the secondary side of current transformer 4
The input for stating detection control unit 3 is connected with the first protection location 1, and the output end of the detection control unit 3 is protected with second
The control end connection of shield unit 2, wherein, 1 action of the first protection location has precedence over the second protection location 2, and the second protection location 2
Perform protection end and lag behind the first protection location 1；By said structure, can occur open in the secondary side of current transformer 4
Make protection execution action during road in time, protect time delay to cause current transformer 4 or load RL to damage so as to be prevented effectively to perform
It is bad, effectively guarantee the service life of current transformer 4, and simple structure, stability is strong, maintains easily.
In the present embodiment, first protection location 1 includes two-way Transient Suppression Diode TVS1 and resistance R1；
One end of the two-way Transient Suppression Diode TVS1 is connected to one end of the second siding ring of current transformer 4,
The other end of two-way Transient Suppression Diode TVS1 is connected with one end of resistance R1, the other end and the current transformer 4 of resistance R1
The other end of second siding ring connect and be grounded, when the secondary side of current transformer 4 is opened a way and induces high pressure, if
When voltage exceedes rotection thresholds, two-way Transient Suppression Diode TVS1 punctures, so as to form the secondary side line of current transformer 4
The loop of circle, two-way Transient Suppression Diode TVS1, resistance R1 and ground connection, so as to effectively prevent the two of current transformer 4
The continuity of secondary side open-circuit condition, fast response time.
In the present embodiment, the detection control unit 3 includes resistance R2, resistance R3, resistance R5, resistance R7, resistance R8, electricity
Hold C1, metal-oxide-semiconductor Q1 and controllable silicon SCR 2；
One end of the resistance R2 is connected to the points of common connection between two-way Transient Suppression Diode TVS1 and resistance R1,
The other end of resistance R2 is grounded by resistance R3, and the points of common connection of the resistance R2 and resistance R3 is grounded by electric capacity C1, institute
The points of common connection for stating resistance R2 and resistance R3 is connected with the grid of metal-oxide-semiconductor Q1, and the drain electrode of the metal-oxide-semiconductor Q1 is connect by resistance R8
The source electrode of power supply VCC, metal-oxide-semiconductor Q1 is grounded by resistance R5, and the anode of the controllable silicon SCR 2 is connected to power supply VCC, controllable silicon
The negative electrode of SCR2 is grounded by resistance R7, and the control pole of controllable silicon SCR 2 is connected to the drain electrode of metal-oxide-semiconductor Q1, the moon of controllable silicon SCR 2
Pole is connected with the control end of the second protection location 2 as the output end of detection control unit 3；Wherein, it is for the ease of control, controllable
The positive pole of silicon SCR2 is connected to external power supply VCC by switching S1, and switch S1 is switched using closed type, recovers after artificial disconnection again
To closure state；
Second protection location 2 includes controllable silicon SCR 1 and resistance R6, and the anode of the controllable silicon SCR 1 is connected to electricity
One end of the second siding ring of current transformer 4, the negative electrode of controllable silicon SCR 1 are connected to the secondary of current transformer 4 by resistance R6
The other end of lateral coil is simultaneously grounded, the control pole of controllable silicon SCR 1 as the second protection location 2 control end be connected to detection
The output end of control unit 3, after two-way Transient Suppression Diode TVS1 punctures, the grid of metal-oxide-semiconductor Q1 has control source and leads
Logical, so as to the electric current of power supply VCC supplies imports to the controller of controllable silicon SCR 2, controllable silicon SCR 2 is turned on, and then controllable silicon
SCR1 is turned on, and the resistance of resistance R6 is less than resistance R1 in use, therefore, after controllable silicon SCR 1 is turned on, the first protection
Unit 1 and the second protection location 2 enter into guard mode, after being punctured due to TVS1, by the second siding ring of current transformer 4
Formation closed-loop path, so as to absorb the impact of instantaneous high pressure and high current, then current transformer 4 progresses into normal
The secondary side current for causing current transformer 4 is flowed primarily through the second protection location 2 by state, the now conducting of controllable silicon SCR 1,
Therefore, the first protection location 1 is gradually backed out performing guard mode, and two-way Transient Suppression Diode TVS1 recovers, and waits next time
Protection is performed, and now the second protection location 2 keeps guard mode after staff excludes secondary side open fault, work
Make the current supply circuit that personnel cut off controllable silicon SCR 2 by button switch S1.
In the present embodiment, present invention additionally comprises police instruction unit 5, the police instruction unit 5 includes electric capacity C2, luminous
Diode (LED) 1 and resistance R4, the positive pole of the LED 1 are connected to the negative electrode of controllable silicon SCR 2, light-emitting diodes
The negative pole of pipe LED1 is grounded by resistance R4, and the positive pole of LED 1 is grounded by electric capacity C2, by this structure, energy
Enough effectively indicated beneficial to the secondary side open fault to current transformer 4, point out staff to overhaul in time.
Finally illustrate, above example is only unrestricted to illustrate technical scheme, although with reference to compared with
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, and without deviating from the objective and scope of technical solution of the present invention, which all should be covered at this
In the middle of the right of invention.
Claims (7)
1. a kind of secondary side open circuit protecting equipment of current mutual inductor, it is characterised in that：It is single including the first protection location, the second protection
Unit and detection control unit；
First protection location and the second protection location are all connected to the two ends of Current Transformer Secondary lateral coil, and first protects
Shield unit and the second protection location are in parallel with the load RL of Current Transformer Secondary side, the input of the detection control unit
It is connected with the first protection location, the output end of the detection control unit is connected with the control end of the second protection location.
2. secondary side open circuit protecting equipment of current mutual inductor according to claim 1, it is characterised in that：First protection is single
Unit includes two-way Transient Suppression Diode TVS1 and resistance R1；
One end of the two-way Transient Suppression Diode TVS1 is connected to one end of Current Transformer Secondary lateral coil, two-way transient state
The other end of diode TVS1 is suppressed to be connected with one end of resistance R1, the other end and the Current Transformer Secondary lateral coil of resistance R1
The other end connect and be grounded.
3. secondary side open circuit protecting equipment of current mutual inductor according to claim 2, it is characterised in that：The detection control is single
Unit includes resistance R2, resistance R3, resistance R5, resistance R7, resistance R8, electric capacity C1, metal-oxide-semiconductor Q1 and controllable silicon SCR 2；
One end of the resistance R2 is connected to the points of common connection between two-way Transient Suppression Diode TVS1 and resistance R1, resistance
The other end of R2 is connected with one end of resistance R3, the other end ground connection of resistance R3；One end of the grid and electric capacity C1 of metal-oxide-semiconductor Q1 is equal
It is connected with the points of common connection of the resistance R2 and resistance R3, the drain electrode of the metal-oxide-semiconductor Q1 is connected with one end of the resistance R8,
The other end external power supply VCC of resistance R8, the source electrode of metal-oxide-semiconductor Q1 are connected with one end of the resistance R5, the other end of resistance R5
It is connected and is grounded with the other end of the other end and resistance R3 of the electric capacity C1；The anode of the controllable silicon SCR 2 is connected to power supply
VCC, the negative electrode of controllable silicon SCR 2 are connected with one end of resistance R7, the other end ground connection of resistance R7；The control pole of controllable silicon SCR 2
The drain electrode of metal-oxide-semiconductor Q1 is connected to, the negative electrode of controllable silicon SCR 2 is used as the output end and the second protection location of detection control unit
Control end connects.
4. secondary side open circuit protecting equipment of current mutual inductor according to claim 3, it is characterised in that：Second protection is single
Unit includes controllable silicon SCR 1 and resistance R6, and the anode of the controllable silicon SCR 1 is connected to the one of Current Transformer Secondary lateral coil
End, the negative electrode of controllable silicon SCR 1 are connected with one end of resistance R6, the other end and the Current Transformer Secondary lateral coil of resistance R6
The other end connects and is grounded, and the control pole of controllable silicon SCR 1 is defeated with detection control unit as the control end of the second protection location
Go out end connection.
5. secondary side open circuit protecting equipment of current mutual inductor according to claim 3, it is characterised in that：Which also refers to including warning
Show unit, the police instruction unit includes electric capacity C2, LED 1 and resistance R4；The LED 1
Positive pole be all connected with one end of the negative electrode, one end of resistance R7 and electric capacity C2 of controllable silicon SCR 2, LED 1 it is negative
Pole is connected with one end of resistance R4, and the other end of resistance R4 is connected and connects with the other end of the other end of resistance R7 and electric capacity C2
Ground.
6. secondary side open circuit protecting equipment of current mutual inductor according to claim 3, it is characterised in that：The controllable silicon SCR 2
Anode and power supply VCC between be provided with switch S1, and switch S1 be closed type switch.
7. secondary side open circuit protecting equipment of current mutual inductor according to claim 4, it is characterised in that：The resistance of the resistance R6
Resistance of the value less than resistance R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610951138.9A CN106532640B (en) | 2016-10-26 | 2016-10-26 | Secondary side open circuit protecting equipment of current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610951138.9A CN106532640B (en) | 2016-10-26 | 2016-10-26 | Secondary side open circuit protecting equipment of current mutual inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106532640A true CN106532640A (en) | 2017-03-22 |
| CN106532640B CN106532640B (en) | 2018-11-27 |
Family
ID=58326843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610951138.9A Active CN106532640B (en) | 2016-10-26 | 2016-10-26 | Secondary side open circuit protecting equipment of current mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106532640B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785870A (en) * | 2017-11-11 | 2018-03-09 | 河南森源电气股份有限公司 | A kind of current transformer and its secondary side open-circuit protecting device |
| CN107785869A (en) * | 2017-11-08 | 2018-03-09 | 河南森源电气股份有限公司 | A kind of current transformer and its secondary side protective arrangement for limiting output voltage |
| CN107979071A (en) * | 2017-12-06 | 2018-05-01 | 国家电网公司 | Remote monitoring of power transmission line system |
| CN110994573A (en) * | 2019-11-22 | 2020-04-10 | 重庆市送变电工程有限公司 | Leakage protection circuit based on transformer reversal polarity demagnetization method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5291365A (en) * | 1991-10-22 | 1994-03-01 | Nippondenso Co., Ltd. | Power supply with overvoltage protection circuit |
| CN103427410A (en) * | 2013-08-27 | 2013-12-04 | 珠海欧力配电自动化系统有限公司 | Alternating-direct-current power source voltage stabilization protective circuit |
| CN103956714A (en) * | 2014-04-24 | 2014-07-30 | 合肥沃华电气技术有限公司 | High-sensitivity multifunctional CT open circuit protection device |
| CN204068242U (en) * | 2014-07-04 | 2014-12-31 | 安徽金力电气技术有限公司 | Intelligent current instrument transformer secondary side overvoltage protection device |
| CN104577982A (en) * | 2015-01-12 | 2015-04-29 | 深圳市普元电力技术有限公司 | Open circuit protective circuit for secondary side output circuit of current transformer |
-
2016
- 2016-10-26 CN CN201610951138.9A patent/CN106532640B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5291365A (en) * | 1991-10-22 | 1994-03-01 | Nippondenso Co., Ltd. | Power supply with overvoltage protection circuit |
| CN103427410A (en) * | 2013-08-27 | 2013-12-04 | 珠海欧力配电自动化系统有限公司 | Alternating-direct-current power source voltage stabilization protective circuit |
| CN103956714A (en) * | 2014-04-24 | 2014-07-30 | 合肥沃华电气技术有限公司 | High-sensitivity multifunctional CT open circuit protection device |
| CN204068242U (en) * | 2014-07-04 | 2014-12-31 | 安徽金力电气技术有限公司 | Intelligent current instrument transformer secondary side overvoltage protection device |
| CN104577982A (en) * | 2015-01-12 | 2015-04-29 | 深圳市普元电力技术有限公司 | Open circuit protective circuit for secondary side output circuit of current transformer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785869A (en) * | 2017-11-08 | 2018-03-09 | 河南森源电气股份有限公司 | A kind of current transformer and its secondary side protective arrangement for limiting output voltage |
| CN107785870A (en) * | 2017-11-11 | 2018-03-09 | 河南森源电气股份有限公司 | A kind of current transformer and its secondary side open-circuit protecting device |
| CN107785870B (en) * | 2017-11-11 | 2023-11-24 | 河南森源电气股份有限公司 | Current transformer and secondary side open circuit protection device thereof |
| CN107979071A (en) * | 2017-12-06 | 2018-05-01 | 国家电网公司 | Remote monitoring of power transmission line system |
| CN110994573A (en) * | 2019-11-22 | 2020-04-10 | 重庆市送变电工程有限公司 | Leakage protection circuit based on transformer reversal polarity demagnetization method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106532640B (en) | 2018-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103296671B (en) | For flexible direct current power transmission system AC overvoltage protection and guard method | |
| CN106532640A (en) | Secondary side open circuit protection device of current transformer | |
| CN203722205U (en) | Overvoltage and electric leakage protection circuit | |
| CN104577971B (en) | Power off trip protection plug | |
| CN206442105U (en) | Current transformer monitoring and protecting system | |
| CN110707764B (en) | Induction power taking system for OPGW monitoring | |
| CN105490101B (en) | Has the protection plug of power-off tripping and superpressure trip avoidance function | |
| CN204967236U (en) | Leakage protector | |
| CN102354869A (en) | Electricity leakage protection plug with alarm device | |
| CN204131100U (en) | Clean robot and battery protection system thereof | |
| CN103631163A (en) | Switch circuit for alternating current power supply | |
| CN202183530U (en) | Electric leakage protection plug with alarming device | |
| CN107861016A (en) | One kind ground wire disconnects automatic failure alarm device | |
| CN104577968A (en) | Three-phase overvoltage, under-voltage and default phase integrated protection circuit | |
| CN204928193U (en) | Battery charging circuit in area protection return circuit | |
| CN204179654U (en) | A kind of lightning protection circuit bearing 6kV thunderbolt by ± 40V signal | |
| CN201398073Y (en) | Novel power supply safety protection system | |
| CN116581720A (en) | Thyristor type direct current breaker and control method thereof | |
| CN206975126U (en) | A kind of high-voltage large-capacity power capacitor short-circuit test device | |
| CN217282209U (en) | Open circuit protection device for current transformer | |
| CN203300911U (en) | Safe earth leakage protection plug with charged ground line alarm function | |
| CN214204995U (en) | Battery power supply protection circuit and battery power supply system | |
| CN201252392Y (en) | Earth-leakage protector | |
| CN104917154A (en) | Electric leakage protection device for direct-current power supply of streetcar | |
| CN205960628U (en) | Current leakage protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |