CN106532640B - Secondary side open circuit protecting equipment of current mutual inductor - Google Patents
Secondary side open circuit protecting equipment of current mutual inductor Download PDFInfo
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- CN106532640B CN106532640B CN201610951138.9A CN201610951138A CN106532640B CN 106532640 B CN106532640 B CN 106532640B CN 201610951138 A CN201610951138 A CN 201610951138A CN 106532640 B CN106532640 B CN 106532640B
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- resistance
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- protection location
- current transformer
- controllable silicon
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- 238000001514 detection method Methods 0.000 claims abstract description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 39
- 229910052710 silicon Inorganic materials 0.000 claims description 39
- 239000010703 silicon Substances 0.000 claims description 39
- 239000004065 semiconductor Substances 0.000 claims description 16
- 230000001052 transient effect Effects 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 15
- 230000001629 suppression Effects 0.000 claims description 15
- 230000005611 electricity Effects 0.000 description 4
- 101000668165 Homo sapiens RNA-binding motif, single-stranded-interacting protein 1 Proteins 0.000 description 3
- 102100039692 RNA-binding motif, single-stranded-interacting protein 1 Human genes 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 description 1
- 101150105073 SCR1 gene Proteins 0.000 description 1
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
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
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- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of secondary side open circuit protecting equipment of current mutual inductor provided by the invention, including the first protection location, the second protection location and detection control unit；First protection location and the second protection location are all connected to the both ends of the second siding ring of current transformer and the first protection location and the second protection location form parallel-connection structure with the load RL of Current Transformer Secondary side; the input terminal of the detection control unit is connect with the first protection location, and the output end of the detection control unit is connect with the control terminal of the second protection location；Protection can be made in time when Current Transformer Secondary side is opened a way executes movement; current transformer or load damage are caused to effectively avoid executing protection delay, effectively ensures the service life of current transformer, and structure is simple; stability is strong, maintains easily.
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-protections
Device.
Background technique
Current transformer is widely used in electric system, such as measurement, protection and control etc. to route, according to electricity
The characteristic of current transformer, current transformer in use when forbid secondary side open a way, this is because secondary side open a way shape
Under state, the electric current of the primary side of current transformer is completely used for excitation and makes the core sataration of current transformer to mutual in electric current
The secondary side of sensor induces high pressure, to bring serious harm.
The secondary side open-circuit-protection measure of current transformer has the disadvantage that in the prior art：The one side prior art is past
Judged toward using the modes such as electric current, voltage, then by protecting circuit to execute protection, response speed is slow, often works as
The load of current transformer or current transformer has damaged when protection equipment executes protection, to cause irremediable damage
It loses；On the other hand, structure is complicated for the protected mode of the prior art, is unfavorable for safeguarding, to cause stability poor.
It is, therefore, desirable to provide a kind of new secondary side open circuit protecting equipment of current mutual inductor, it can be in current transformer two
When secondary side is opened a way in time make protection execute movement, thus effectively avoid execute protection be delayed cause current transformer or
Load damage, effectively ensures the service life of current transformer, and structure is simple, stability is strong, maintains easily.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of secondary side open circuit protecting equipment of current mutual inductor, it can be in electricity
Protection is made when current transformer secondary side is opened a way in time and executes movement, protects delay to cause electric current to effectively avoid executing
Mutual inductor or load damage, effectively ensure the service life of current transformer, and structure is simple, stability is strong, facilitates dimension
Shield.
To achieve the goals above, a kind of secondary side open circuit protecting equipment of current mutual inductor provided by the invention 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 both 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 connect with the first protection location, the output end of the detection control unit is connect with the control terminal of the second protection location；
First protection location 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
The other end of Transient Suppression Diode TVS1 is connect with one end of resistance R1, the other end of resistance R1 and Current Transformer Secondary side
The other end connect and ground of coil；
The detection control unit includes resistance R2, resistance R3, resistance R5, resistance R7, resistance R8, capacitor 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 connect with one end of resistance R3, the other end ground connection of resistance R3；The one of the grid of metal-oxide-semiconductor Q1 and capacitor C1
End is connect with the points of common connection of the resistance R2 and resistance R3, the drain electrode of the metal-oxide-semiconductor Q1 and one end of the resistance R8
Connection, the other end external power supply VCC of resistance R8, the source electrode of metal-oxide-semiconductor Q1 are connect with one end of the resistance R5, and resistance R5's is another
One end connect and is grounded with the other end of the other end of the capacitor C1 and resistance R3；The anode of the controllable silicon SCR 2 is connected to
The cathode of power supply VCC, controllable silicon SCR 2 are connect 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 cathode of controllable silicon SCR 2 is single as the output end of detection control unit and the second protection
The control terminal connection of member.
Preferred embodiment, second protection location include controllable silicon SCR 1 and resistance R6, the anode of the controllable silicon SCR 1
It is connected to one end of Current Transformer Secondary lateral coil, the cathode of controllable silicon SCR 1 is connect with one end of resistance R6, resistance R6's
The other end connect and ground of the other end and Current Transformer Secondary lateral coil, the control electrode of controllable silicon SCR 1 is as the second protection
The control terminal of unit and the output end of detection control unit connect.The resistance value of the resistance R6 is less than the resistance value of resistance R1.
Preferred embodiment, the secondary side open circuit protecting equipment of current mutual inductor further include police instruction unit, and the alarm refers to
Show that unit includes capacitor C2, Light-emitting diode LED 1 and resistance R4；The Light-emitting diode LED 1 anode with it is silicon-controlled
One end of the cathode of SCR2, one end of resistance R7 and capacitor C2 is all connected with, the cathode of Light-emitting diode LED 1 and the one of resistance R4
End connection, the other end connect and ground of the other end of resistance R4 and the other end of resistance R7 and capacitor C2.
Switch S1 is provided between the anode and power supply VCC of the controllable silicon SCR 2.
Beneficial effects of the present invention：Secondary side open circuit protecting equipment of current mutual inductor of the invention, can be in Current Mutual Inductance
Protection is made when device secondary side is opened a way in time and executes movement, protects delay to cause current transformer to effectively avoid executing
Or load damage, effectively ensure the service life of current transformer, and structure is simple, stability is strong, maintains easily.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples：
Fig. 1 is circuit theory schematic diagram of the invention.
Specific embodiment
Fig. 1 is circuit diagram of the invention, as shown, a kind of Current Transformer Secondary side open circuit provided by the invention
Protective 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 both 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 terminal for stating detection control unit 3 is connect with the first protection location 1, and the output end of the detection control unit 3 and second is protected
Protect the control terminal connection of unit 2, wherein the first protection location 1 is acted prior to the second protection location 2, and the second protection location 2
Executing protection terminates to lag behind the first protection location 1；By above structure, can be opened in the secondary side of current transformer 4
Protection is made when road in time and executes movement, protects delay to cause current transformer 4 or load RL damage to effectively avoid executing
It is bad, effectively ensure the service life of current transformer 4, and structure is simple, 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 connect with one end of resistance R1, the other end and current transformer 4 of resistance R1
Second siding ring other end connect and ground, when the secondary side of current transformer 4 is opened a way and when inducing high pressure, if
When voltage is more than protection threshold value, two-way Transient Suppression Diode TVS1 breakdown, to form the secondary side line of current transformer 4
The circuit of circle, two-way Transient Suppression Diode TVS1, resistance R1 and ground connection, 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 are grounded by capacitor C1, institute
The points of common connection for stating resistance R2 and resistance R3 is connect 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 are grounded by resistance R5, and the anode of the controllable silicon SCR 2 is connected to power supply VCC, silicon-controlled
The cathode of SCR2 is grounded by resistance R7, and the control electrode of controllable silicon SCR 2 is connected to the drain electrode of metal-oxide-semiconductor Q1, the yin of controllable silicon SCR 2
Pole is connect as the output end of detection control unit 3 with the control terminal of the second protection location 2；Wherein, for the ease of control, controllably
The anode of silicon SCR2 is connected to external power supply VCC by switch S1, and switch S1 uses normally closed switch, restores again after artificial disconnection
To closed state；
Second protection location 2 includes that controllable silicon SCR 1 and resistance R6, the anode of the controllable silicon SCR 1 are connected to electricity
The cathode of one end of the second siding ring of current transformer 4, controllable silicon SCR 1 is connected to the secondary of current transformer 4 by resistance R6
The other end of lateral coil and ground connection, the control electrode of controllable silicon SCR 1 as the second protection location 2 control terminal and be connected to detection
The output end of control unit 3, after two-way Transient Suppression Diode TVS1 breakdown, the grid of metal-oxide-semiconductor Q1 has voltage input and leads
Logical, so that the electric current of power supply VCC supply imported into the controller of controllable silicon SCR 2, controllable silicon SCR 2 is connected, and then silicon-controlled
SCR1 conducting, and the resistance value of resistance R6 is less than resistance R1 in use, therefore, and after controllable silicon SCR 1 is connected, the first protection
Unit 1 and the second protection location 2 enter guard mode, after TVS1 breakdown, by the second siding ring of current transformer 4
Formation closed circuit, to absorb the impact of instantaneous high pressure and high current, then current transformer 4 is progressed into normal
State, the at this time conducting of controllable silicon SCR 1, the secondary side current that will lead to current transformer 4 flow primarily through the second protection location 2,
Therefore, the first protection location 1 is gradually backed out execution guard mode, and two-way Transient Suppression Diode TVS1 restores, and waits next time
Protection executes, and the second protection location 2 keeps guard mode after staff excludes secondary side open-circuit fault at this time, work
Make the current supply circuit that personnel cut off controllable silicon SCR 2 by button switch S1.
In the present embodiment, the invention also includes police instruction unit 5, the police instruction unit 5 includes capacitor C2, shines
Diode (LED) 1 and resistance R4, the anode of the Light-emitting diode LED 1 are connected to the cathode of controllable silicon SCR 2, light-emitting diodes
The cathode of pipe LED1 is grounded by resistance R4, and the anode of Light-emitting diode LED 1 is grounded by capacitor C2, passes through this structure, energy
It is enough to be conducive to effectively indicate the secondary side open-circuit fault of current transformer 4, prompt staff to overhaul in time.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (5)
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
Member and detection control unit；
First protection location and the second protection location are all connected to the both ends of Current Transformer Secondary lateral coil, and first protects
It protects unit and the second protection location is in parallel with the load RL of Current Transformer Secondary side, the input terminal of the detection control unit
It is connect with the first protection location, the output end of the detection control unit is connect with the control terminal of the second protection location；
First protection location 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 inhibited to connect with one end of resistance R1, the other end and Current Transformer Secondary lateral coil of resistance R1
Other end connect and ground；
The detection control unit include resistance R2, resistance R3, resistance R5, resistance R7, resistance R8, capacitor 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 connect with one end of resistance R3, the other end ground connection of resistance R3；The grid of metal-oxide-semiconductor Q1 and one end of capacitor C1 are equal
It being connect with the points of common connection of the resistance R2 and resistance R3, the drain electrode of the metal-oxide-semiconductor Q1 is connect 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 connect with one end of the resistance R5, the other end of resistance R5
It connect and is grounded with the other end of the other end of the capacitor C1 and resistance R3；The anode of the controllable silicon SCR 2 is connected to power supply
The cathode of VCC, controllable silicon SCR 2 are connect with one end of resistance R7, the other end ground connection of resistance R7；The control electrode of controllable silicon SCR 2
It is connected to the drain electrode of metal-oxide-semiconductor Q1, the output end and the second protection location of the cathode of controllable silicon SCR 2 as detection control unit
Control terminal connection.
2. secondary side open circuit protecting equipment of current mutual inductor according to claim 1, it is characterised in that：Second protection is single
Member includes that controllable silicon SCR 1 and resistance R6, the anode of the controllable silicon SCR 1 are connected to the one of Current Transformer Secondary lateral coil
End, the cathode of controllable silicon SCR 1 are connect with one end of resistance R6, the other end and the Current Transformer Secondary lateral coil of resistance R6
Other end connect and ground, the control electrode of controllable silicon SCR 1 as the second protection location control terminal and detection control unit it is defeated
Outlet connection.
3. secondary side open circuit protecting equipment of current mutual inductor according to claim 1, it is characterised in that：It further includes that alarm refers to
Show that unit, the police instruction unit include capacitor C2, Light-emitting diode LED 1 and resistance R4；The Light-emitting diode LED 1
Anode be all connected with one end of the cathode of controllable silicon SCR 2, one end of resistance R7 and capacitor C2, Light-emitting diode LED 1 is born
Pole is connect with one end of resistance R4, and the other end of resistance R4 connect and connects with the other end of the other end of resistance R7 and capacitor C2
Ground.
4. secondary side open circuit protecting equipment of current mutual inductor according to claim 1, it is characterised in that：The controllable silicon SCR 2
Anode and power supply VCC between be provided with switch S1, and switch S1 is normally closed switch.
5. secondary side open circuit protecting equipment of current mutual inductor according to claim 2, it is characterised in that：The resistance of the resistance R6
Value is less than the resistance value of 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 |
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| Publication Number | Publication Date |
|---|---|
| CN106532640A CN106532640A (en) | 2017-03-22 |
| CN106532640B true CN106532640B (en) | 2018-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610951138.9A Active CN106532640B (en) | 2016-10-26 | 2016-10-26 | Secondary side open circuit protecting equipment of current mutual inductor |
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Families Citing this family (4)
| 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 |
| 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 |
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| 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 |
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