CN202206118U - Current mutual induction secondary over-voltage protection device - Google Patents
Current mutual induction secondary over-voltage protection device Download PDFInfo
- Publication number
- CN202206118U CN202206118U CN2011202701648U CN201120270164U CN202206118U CN 202206118 U CN202206118 U CN 202206118U CN 2011202701648 U CN2011202701648 U CN 2011202701648U CN 201120270164 U CN201120270164 U CN 201120270164U CN 202206118 U CN202206118 U CN 202206118U
- Authority
- CN
- China
- Prior art keywords
- circuit
- current mutual
- resistance
- electric current
- mutual inductance
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a current mutual induction secondary over-voltage protection device, which comprises at least an over-voltage protection circuit, a reset circuit, a warning circuit and an indicator circuit. The over-voltage protection circuit comprises an over-voltage detection circuit, a rectification circuit, a filter circuit, a voltage stabilizing circuit and a bistable relay; the over-voltage detection circuit is electrically connected with the filter circuit through the rectification circuit; the filter circuit is electrically connected with a set coil of the bistable relay through the voltage stabilizing circuit; a reset coil of the bistable relay is electrically connected with the reset circuit; and one contact of the bistable relay is electrically connected with the warning circuit and the indicator circuit respectively, and one end of the other contact of the bistable relay is connected with the output earthing terminal of the current mutual induction secondary over-voltage protection device, and the other end of the same is connected with the output high voltage terminal of the current mutual induction secondary over-voltage protection device. The current mutual induction secondary over-voltage protection device can effectively prevent accidents caused by the secondary opening of the current transformer.
Description
Technical field
The utility model relates to a kind of overvoltage protection, relates in particular to a kind of electric current mutual inductance secondary overvoltage protection.
Background technology
In electric power system, current transformer (CT) is widely used in the measurement and the control of primary current.The instrument transformer secondary side is in approximate short-circuit condition during operate as normal, and output voltage is very low.If secondary winding open circuit in running, or a winding flows through abnormal current (like lightning current, resonance overcurrent, electric capacity charging current, inductance starting current etc.), all can produce the overvoltage of thousands of volts even volts up to ten thousand at secondary side.This not only works the mischief to electrical secondary system insulation, also can make the too drastic and scaling loss of instrument transformer, even crisis staff's life security.
The utility model content
In view of this, be necessary to provide a kind of electric current mutual inductance secondary overvoltage protection, be intended to effectively to prevent cause accident because of the Current Transformer Secondary open circuit.
The utility model is to realize like this; A kind of electric current mutual inductance secondary overvoltage protection; It comprises at least one overvoltage crowbar, reset circuit, warning circuit and indicating circuit; This at least one overvoltage crowbar comprises overvoltage detection circuit, rectification circuit, filter circuit, voltage stabilizing circuit and bistable relay; This voltage detecting circuit electrically connects via this rectification circuit and this filter circuit; This filter circuit electrically connects via the set coil of this voltage stabilizing circuit and this bistable relay, and the resetting coil of this bistable relay and this reset circuit electrically connect, and one of them contact of this bistable relay can be electrically connected at this warning circuit and this indicating circuit respectively; One of another contact of this bistable relay connects the output earth terminal of this electric current mutual inductance secondary overvoltage protection, and the other end connects the output high-pressure side of this electric current mutual inductance secondary overvoltage protection.
Further; This rectification circuit comprises two inputs; Electrical ground connection in two inputs of this rectification circuit; This voltage detecting circuit comprises two piezo-resistances, and one in these two piezo-resistances are serially connected with another person in two inputs of this rectification circuit, and another person's in these two piezo-resistances two ends are electrically connected at two inputs of this rectification circuit respectively.
Further, this rectification circuit is a rectifier bridge.
Further, this rectification circuit comprises two outputs, and this filter circuit comprises electric capacity and a resistance, is electrically connected at two outputs of this rectification circuit after this resistance and this capacitances in series.
Further, this voltage stabilizing circuit comprises piezo-resistance, and the two ends of this piezo-resistance are electrically connected at two outputs of this rectification circuit.
Further; This reset circuit comprises button and resistance; One end of this resistance electrically connects via this button and a power supply, and an end of the other end of this resistance and the resetting coil of this bistable relay electrically connects, the electrical ground connection of the other end of the resetting coil of this bistable relay.
Further; This warning circuit comprises diode, two resistance and buzzer; The anode of this diode and the corresponding contacts of this bistable relay electrically connect; The negative electrode of this diode is via the electrical ground connection in these two resistance, and also is electrically connected at this buzzer via another person in these two resistance.
Further, this indicating circuit comprises resistance, LED lamp and diode, and the anode of this diode and the corresponding contacts of this bistable relay electrically connect, and the negative electrode of this diode is electrically connected at this LED lamp via this resistance.
Further; This electric current mutual inductance secondary overvoltage protection also comprises test circuit; This test circuit comprises two diodes, resistance and button; The anode of one in these two diodes and the corresponding contacts of this bistable relay electrically connect, and negative electrode of one in these two diodes and another person's in this two diodes negative electrode electrically connect, and another person's in these two diodes anode is electrically connected at a power supply via this button.
Further, this electric current mutual inductance secondary overvoltage protection also comprises fly-wheel diode, and the two ends of this fly-wheel diode are electrically connected at two outputs of this rectification circuit.
The utility model compared with prior art; Beneficial effect is: the electric current mutual inductance secondary overvoltage protection that the utility model provides is connected to the two ends of Current Transformer Secondary side when reality is used; Leakage Current is minimum during normal the operation; Be high-impedance state, because Leakage Current minimum (less than 1 μ A) influences accurately and can ignore with the table meter this loop protection operating value; When this secondary loop of mutual inductor open circuit or a winding occur being unusual overcurrent; The overvoltage that secondary winding produces is moved electric current mutual inductance secondary overvoltage protection rapidly, and with this Current Transformer Secondary side short circuit, shows trouble location on the panel of this current transformer automatically; And be furnished with the node signal of having no chance and export; After fault is got rid of, by the hand-reset button, normal operation input again again after circuit restores to the original state.
Description of drawings
The modular structure sketch map of the electric current mutual inductance secondary overvoltage protection that Fig. 1 provides for the utility model first execution mode.
Fig. 2 is the circuit diagram of electric current mutual inductance secondary overvoltage protection among Fig. 1.
The circuit diagram of the electric current mutual inductance secondary overvoltage protection that Fig. 3 provides for the utility model second execution mode.
Symbol description
Electric current mutual inductance secondary overvoltage protection 100
Overvoltage crowbar 10
Voltage detecting circuit 11
Rectification circuit 12
Filter circuit 13
Voltage stabilizing circuit 14
Bistable relay 15
Reset circuit 16
Warning circuit 17
Indicating circuit 18
Set coil 151
Resetting coil 153
Contact 155,157
Input 121,123
Two outputs 124,126
Capacitor C 1
Resistance R 1 ~ R9
Sustained diode 1
Diode D2 ~ D4
Buzzer LS
LED lamp LED1
Power Vcc
Button K1, K2
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 1; The module of the electric current mutual inductance secondary overvoltage protection 100 that it provides for the utility model first execution mode is formed sketch map; Electric current mutual inductance secondary overvoltage protection 100 comprises at least one overvoltage crowbar 10; In this execution mode, be that example describes with an overvoltage crowbar 10.
Overvoltage crowbar 10 comprises overvoltage detection circuit 11, rectification circuit 12, filter circuit 13, voltage stabilizing circuit 14, bistable relay 15, reset circuit 16, warning circuit 17 and indicating circuit 18.Voltage detecting circuit 11 electrically connects via rectification circuit 12 and filter circuit 13; Filter circuit 13 electrically connects via the set coil 151 of voltage stabilizing circuit 14 with bistable relay 15; The resetting coil 153 of bistable relay 15 electrically connects with reset circuit 16; One of them contact 155 of bistable relay 15 can be electrically connected at warning circuit 17 and indicating circuit 18 respectively, and another contact 157 of bistable relay 15 is ground connection electrically.
See also Fig. 2, in this execution mode, rectification circuit 12 is a rectifier bridge, and it comprises 121,123 and two outputs 124,126 of two inputs.Input 123 electrical ground connection.
Voltage detecting circuit 11 comprises two piezo-resistance R1, R2, and piezo-resistance R1 is serially connected with the input 121 of rectification circuit 12, and the two ends of piezo-resistance R2 are electrically connected at two inputs 121,123 of rectification circuit 12 respectively.
Filter circuit 13 comprises capacitor C 1 and resistance R 4, resistance R 4 and two outputs 124,126 that are electrically connected at rectification circuit 12 after capacitor C 1 is connected.
Voltage stabilizing circuit 14 comprises continuous piezo-resistance R3, and the two ends of piezo-resistance R3 are electrically connected at two outputs 124,126 of rectification circuit 12 respectively.The anode of sustained diode 1 is electrically connected between capacitor C 1 and the resistance R 3, and the negative electrode of sustained diode 1 is electrically connected between capacitor C 1 and the resistance R 4.
Reset circuit 16 comprises button K1 and resistance R 5; One end of resistance R 5 electrically connects via button K1 and a power Vcc; One end of the resetting coil 153 of the other end of resistance R 5 and bistable relay 15 electrically connects; And also via the electrical ground connection of pull down resistor R8, the electrical ground connection of the other end of the resetting coil 153 of bistable relay 15.
Warning circuit 17 comprises diode D2; Two resistance R 6, R7 and buzzer LS; The corresponding contacts 155 of the anode of diode D2 and bistable relay 15 electrically connects, and the negative electrode of diode D2 is via resistance R 7 electrical ground connection, and also is electrically connected at buzzer LS via resistance R 6.
Indicating circuit 18 comprises resistance R 9, LED lamp LED1 and diode D3, and the corresponding contacts 155 of the anode of diode D3 and bistable relay 15 electrically connects, and the negative electrode of diode D3 is electrically connected at LED lamp LED1 via resistance R 9.In this execution mode, also be provided with test circuit, test circuit comprises diode D3, D4 and button K2, and the negative electrode of the negative electrode of diode D3 and diode D4 electrically connects, and the anode of diode D4 is electrically connected at power Vcc via button K2.
The operation principle of electric current mutual inductance secondary overvoltage protection 100 is following:
, reality is connected to the Current Transformer Secondary side two ends of (figure does not show) when using; Leakage Current is minimum during normal the operation; Be high-impedance state, because Leakage Current minimum (less than 1 μ A) influences accurately and can ignore with the table meter this loop protection operating value; When this secondary loop of mutual inductor open circuit or a winding occur being unusual overcurrent; The overvoltage that secondary winding produces is moved electric current mutual inductance secondary overvoltage protection 100 rapidly, and with this Current Transformer Secondary side short circuit, shows trouble location on the panel of this current transformer automatically; And be furnished with the node signal of having no chance and export; After fault is got rid of, by the hand-reset button, normal operation input again again after circuit restores to the original state.
See also Fig. 3; The circuit of the electric current mutual inductance secondary overvoltage protection 200 that it provides for the utility model second execution mode is formed sketch map; The difference of the electric current mutual inductance secondary overvoltage protection 100 that itself and the utility model first execution mode provide is that the quantity of overvoltage crowbar 10 is three, is appreciated that; The quantity of overvoltage crowbar 10 is not limited to one or three, can be two or more.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (10)
1. electric current mutual inductance secondary overvoltage protection; It is characterized in that; It comprises at least one overvoltage crowbar, reset circuit, warning circuit and indicating circuit; This at least one overvoltage crowbar comprises overvoltage detection circuit, rectification circuit, filter circuit, voltage stabilizing circuit and bistable relay; This voltage detecting circuit electrically connects via this rectification circuit and this filter circuit; This filter circuit electrically connects via the set coil of this voltage stabilizing circuit and this bistable relay, and the resetting coil of this bistable relay and this reset circuit electrically connect, and one of them contact of this bistable relay can be electrically connected at this warning circuit and this indicating circuit respectively; One of another contact of this bistable relay connects the output earth terminal of this electric current mutual inductance secondary overvoltage protection, and the other end connects the output high-pressure side of this electric current mutual inductance secondary overvoltage protection.
2. electric current mutual inductance secondary overvoltage protection as claimed in claim 1; It is characterized in that; This rectification circuit comprises two inputs, the electrical ground connection in two inputs of this rectification circuit, and this voltage detecting circuit comprises two piezo-resistances; In these two piezo-resistances one are serially connected with another person in two inputs of this rectification circuit, and another person's in these two piezo-resistances two ends are electrically connected at two inputs of this rectification circuit respectively.
3. according to claim 1 or claim 2 electric current mutual inductance secondary overvoltage protection is characterized in that this rectification circuit is a rectifier bridge.
4. electric current mutual inductance secondary overvoltage protection as claimed in claim 1; It is characterized in that; This rectification circuit comprises two outputs, and this filter circuit comprises electric capacity and a resistance, is electrically connected at two outputs of this rectification circuit after this resistance and this capacitances in series.
5. electric current mutual inductance secondary overvoltage protection as claimed in claim 1 is characterized in that this voltage stabilizing circuit comprises piezo-resistance, and the two ends of this piezo-resistance are electrically connected at two outputs of this rectification circuit.
6. electric current mutual inductance secondary overvoltage protection as claimed in claim 1; It is characterized in that; This reset circuit comprises button and resistance; One end of this resistance electrically connects via this button and a power supply, and an end of the other end of this resistance and the resetting coil of this bistable relay electrically connects, the electrical ground connection of the other end of the resetting coil of this bistable relay.
7. electric current mutual inductance secondary overvoltage protection as claimed in claim 1; It is characterized in that; This warning circuit comprises diode, two resistance and buzzer; The anode of this diode and the corresponding contacts of this bistable relay electrically connect, and the negative electrode of this diode is via the electrical ground connection in these two resistance, and also are electrically connected at this buzzer via another person in these two resistance.
8. electric current mutual inductance secondary overvoltage protection as claimed in claim 1; It is characterized in that; This indicating circuit comprises resistance, LED lamp and diode; The anode of this diode and the corresponding contacts of this bistable relay electrically connect, and the negative electrode of this diode is electrically connected at this LED lamp via this resistance.
9. electric current mutual inductance secondary overvoltage protection as claimed in claim 1; It is characterized in that; This electric current mutual inductance secondary overvoltage protection also comprises test circuit; This test circuit comprises two diodes, resistance and button; The anode of one in these two diodes and the corresponding contacts of this bistable relay electrically connect, and negative electrode of one in these two diodes and another person's in this two diodes negative electrode electrically connect, and another person's in these two diodes anode is electrically connected at a power supply via this button.
10. electric current mutual inductance secondary overvoltage protection as claimed in claim 1 is characterized in that, this electric current mutual inductance secondary overvoltage protection also comprises fly-wheel diode, and the two ends of this fly-wheel diode are electrically connected at two outputs of this rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202701648U CN202206118U (en) | 2011-07-28 | 2011-07-28 | Current mutual induction secondary over-voltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202701648U CN202206118U (en) | 2011-07-28 | 2011-07-28 | Current mutual induction secondary over-voltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202206118U true CN202206118U (en) | 2012-04-25 |
Family
ID=45970215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202701648U Expired - Fee Related CN202206118U (en) | 2011-07-28 | 2011-07-28 | Current mutual induction secondary over-voltage protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202206118U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709901A (en) * | 2012-06-14 | 2012-10-03 | 北京恒源利通电力技术有限公司 | Overvoltage protection method and device of current transformer |
| CN103490401A (en) * | 2013-09-02 | 2014-01-01 | 国家电网公司 | Misoperation-preventive locking power board |
| CN105021956A (en) * | 2015-07-28 | 2015-11-04 | 北京四方继保自动化股份有限公司 | Transformer secondary circuit break detection method for routine sampling instrument |
| CN106786366A (en) * | 2016-12-16 | 2017-05-31 | 国家电网公司 | Current Transformer Secondary side open-circuit-protection early warning system |
| CN110837037A (en) * | 2019-11-13 | 2020-02-25 | 福建星云电子股份有限公司 | Secondary overvoltage detection circuit for lithium battery pack protection plate |
-
2011
- 2011-07-28 CN CN2011202701648U patent/CN202206118U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709901A (en) * | 2012-06-14 | 2012-10-03 | 北京恒源利通电力技术有限公司 | Overvoltage protection method and device of current transformer |
| CN102709901B (en) * | 2012-06-14 | 2016-06-01 | 北京恒源利通电力技术有限公司 | Current transformer over-voltage protection method and device |
| CN103490401A (en) * | 2013-09-02 | 2014-01-01 | 国家电网公司 | Misoperation-preventive locking power board |
| CN105021956A (en) * | 2015-07-28 | 2015-11-04 | 北京四方继保自动化股份有限公司 | Transformer secondary circuit break detection method for routine sampling instrument |
| CN105021956B (en) * | 2015-07-28 | 2018-01-09 | 北京四方继保自动化股份有限公司 | Routine sampling instrument transformer secondary circuit wire break detection method |
| CN106786366A (en) * | 2016-12-16 | 2017-05-31 | 国家电网公司 | Current Transformer Secondary side open-circuit-protection early warning system |
| CN106786366B (en) * | 2016-12-16 | 2019-04-30 | 国家电网公司 | Current Transformer Secondary side open-circuit-protection early warning system |
| CN110837037A (en) * | 2019-11-13 | 2020-02-25 | 福建星云电子股份有限公司 | Secondary overvoltage detection circuit for lithium battery pack protection plate |
| CN110837037B (en) * | 2019-11-13 | 2021-12-14 | 福建星云电子股份有限公司 | Secondary overvoltage detection circuit for lithium battery pack protection plate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202206118U (en) | Current mutual induction secondary over-voltage protection device | |
| CN102749562A (en) | Insulation monitoring device and monitoring method of power cell of electric vehicle | |
| CN102565662B (en) | State detection device for high-potential thyristor | |
| CN202424123U (en) | Electric leakage protector with high-sensitivity ground wire electrification protection function | |
| CN1808640B (en) | Monitoring device for lightning arrester | |
| CN202817702U (en) | Current leakage protection device | |
| CN102411120A (en) | Earth line selection device for converting station direct current system | |
| CN202353176U (en) | Secondary over-voltage protection device for current transformer | |
| CN202183530U (en) | Electric leakage protection plug with alarming device | |
| CN201955425U (en) | Insulation fault positioning device in hospital isolated power supply system | |
| CN102818961A (en) | Lightning energy-taking device for lightning arrester monitoring device | |
| CN203054156U (en) | Power distribution network single phase grounding fault positioning device based on direct current signal detector | |
| CN202524074U (en) | Secondary open circuit protector of current transformer | |
| CN203352155U (en) | Microcomputer monitoring protecting device for current transformer | |
| CN204706873U (en) | A kind of overvoltage protective device for current transformer secondary side with detection control apparatus | |
| CN203205827U (en) | Current transformer secondary overvoltage protection circuit | |
| CN201828640U (en) | Direct-detecting intelligent apparatus for diagnosing insulation and status of direct-current (DC) system | |
| CN209673880U (en) | A kind of observation circuit in direct current output circuit | |
| CN104065043A (en) | Battery under-voltage protection and display circuit | |
| CN206226083U (en) | A kind of grading system battery charging overvoltage protection circuit | |
| CN205484714U (en) | Circuit is listened to killer switch state | |
| CN202794427U (en) | Ground wire breakage automatic alarm | |
| CN105717418A (en) | High voltage power transmission line indicator | |
| CN204068189U (en) | Possesses the secondary side overvoltage protection device that dead electricity keeps function | |
| CN205195233U (en) | Power leakage protector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20130728 |