CN107317304A - A kind of Current Transformer Secondary dypass voltage protection circuit - Google Patents
A kind of Current Transformer Secondary dypass voltage protection circuit Download PDFInfo
- Publication number
- CN107317304A CN107317304A CN201710529054.0A CN201710529054A CN107317304A CN 107317304 A CN107317304 A CN 107317304A CN 201710529054 A CN201710529054 A CN 201710529054A CN 107317304 A CN107317304 A CN 107317304A
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- diode
- voltage
- electric capacity
- resistance
- current transformer
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Classifications
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- 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
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of Current Transformer Secondary side excess voltage protection, including：Terminals; constitute the input of one group of secondary winding in current transformer; signal transacting; it is connected with terminals; the voltage signal that secondary winding on current transformer is produced is handled, voltage-limiting protection is connected with signal transacting; and protection is controlled to the voltage that signal transacting exceeds, control system includes：Sensor, is connected with signal transacting, and the voltage signal that signal transacting is sent is sensed, relay, it is connected with sensor, control output is connected with sensor, restorer, it is connected with control system, makes control system in running order, warning device, it is connected simultaneously with control device and relay, warning device includes turning circuit one, turning circuit two, decompression voltage regulator and detection circuit.Beneficial effect：The present invention is simple in construction, effectively prevents circuit from occurring overvoltage phenomenon, improves the security of circuit.
Description
Technical field
Field is protected the present invention relates to power technology, it particularly relates to which a kind of Current Transformer Secondary side overvoltage is protected
Protection circuit.
Background technology
Secondary over-voltage protector for current transformer, in power system, current transformer（CT）Applied to once electric
The measurement and control of stream, transformer secondary side is near short circuit state during normal work, and output voltage is very low, and extensively should
For one-shot measurement, control and protection.It is ammeter, kilowatt-hour meter and the essential kit of current control system.
In current system, when secondary winding is opened a way in current transformer running, it will produce thousands of lie prostrate on even
Ten thousand volts of overvoltage, this not only brings harm to the secondary insulating of circuit system, while the also life security band to staff
Carry out hidden danger, therefore, a kind of circuit of our exigences carrys out the destruction that pre- anti-overvoltage is produced, and security is improved with this.
The problem of in correlation technique, effective solution is not yet proposed at present.
The content of the invention
The problem of in correlation technique, the present invention propose one kind can automatically cut off power supply short circuit device, can with gram
Take the above-mentioned technical problem present in existing correlation technique.
The technical proposal of the invention is realized in this way：A kind of Current Transformer Secondary side excess voltage protection, including：
Terminals, constitute the input of one group of secondary winding in current transformer.
Signal transacting, is connected with the terminals, and the voltage signal that the secondary winding on current transformer is produced is carried out
Processing.
Voltage-limiting protection, is connected with the signal transacting, and is controlled protection to the voltage that the signal transacting exceeds.
Second protection, is connected with the signal transacting, prevent the voltage-limiting protection produce damage and to the signal transacting
Carry out second protection.
The control system includes：Sensor, is connected with the signal transacting, the voltage letter sent to the signal transacting
Number sensed, relay is connected with the sensor, control output is connected with the sensor.
Restorer, is connected with the control system, makes the control system in running order.
Warning device, is connected simultaneously with the control device and the relay, and the warning device includes turning circuit
First, turning circuit two, decompression voltage regulator and detection circuit.
The turning circuit one include three-phase electrical input U, resistance R1, diode D1, electric capacity C1, photoelectrical coupler U1 and
Zero line N, the three-phase electrical input U are connected with described resistance R1 one end, the resistance R1 other ends and diode D1 sun
Pole is connected, and anode of the diode D1 negative electrodes respectively with described electric capacity C1 one end and the photoelectrical coupler U1 is connected, described
The electric capacity C1 other ends and the photoelectrical coupler U1 negative electrode are connected with the zero line N respectively.
The turning circuit two include three-phase electrical input V, resistance R2, diode D2, electric capacity C2, photoelectrical coupler U2 and
Zero line N, the three-phase electrical input V are connected with described resistance R2 one end, the resistance R2 other ends and diode D2 sun
Pole is connected, and anode of the diode D2 negative electrodes respectively with described electric capacity C2 one end and the photoelectrical coupler U2 is connected, described
The electric capacity C2 other ends and the photoelectrical coupler U2 negative electrode are connected with the zero line N respectively.
The decompression voltage regulator includes three-phase electrical input W, resistance R3, electric capacity C4, bridge rectifier MB6S, electric capacity C3
It is connected with diode D5, the three-phase electrical input W with described electric capacity C4 one end, the electric capacity C4 other ends and the bridge-type are whole
Stream device MB6S pin points 1 are connected, and the bridge rectifier MB6S pin points 2 are cloudy with described electric capacity C3 one end and the diode D5 respectively
Pole is connected, and the electric capacity C3 other ends and the diode D5 anodes are connected with the bridge rectifier MB6S pin points 4 respectively, institute
Bridge rectifier MB6S pin points 3 are stated to be connected with the zero line N.
The detection circuit includes resistance R4, resistance R5, diode D3, diode D6, relay K1 and triode Q1, institute
State resistance R4 to be connected with the photoelectrical coupler U1 colelctor electrodes, the photoelectrical coupler U1 emitter stages and the photoelectrical coupler U2
Colelctor electrode is connected, and the photoelectrical coupler U2 emitter stages are connected with the triode Q1 base stages, the triode Q1 colelctor electrodes point
It is not connected with the diode D6 negative electrodes, the diode D3 anodes and described relay K1 one end, the diode D6 anodes
It is connected with described resistance R5 one end, the resistance R5 other ends, the diode D3 negative electrodes and the relay K1 other ends point
It is not connected with the bridge rectifier MB6S pin points 2, the triode Q1 emitter stages connect with the bridge rectifier MB6S pin points 4
Connect, the relay K1 adhesive faces be provided with unlimited auxiliary contact NO1, normally opened auxiliary contact NO2, often spare time auxiliary contact NC1 and
Normal spare time auxiliary contact NC2.
Further, the sensor model number is YGC-FX.
Further, the relay is output as parallel way with the control.
Further, the diode D5 is voltage-regulator diode, and the diode D6 is light emitting diode.
Further, the photoelectrical coupler U1 and photoelectrical coupler U2 is respectively Q817 photoelectrical couplers.
Further, the triode Q1 is MMBT3904 triodes.
Further, the bridge rectifier MB6S includes four diode D4, per the two neighboring bridge rectifier
The diode D4 is provided between MB6S pin points, the bridge rectifier MB6S pin points 4 connect the diode D4 anodes, institute
State bridge rectifier MB6S pin points 2 and connect the diode D4 negative electrodes.
Beneficial effects of the present invention are：The voltage signal that signal transacting is produced to the secondary winding on current transformer first
Discrimination conduction is carried out, voltage-limiting protection and second protection can prevent the generation of overvoltage phenomenon in advance, be connected with control system
Power supply and restorer, the former powers for control system, and the latter can allow control system to be in the working condition normally run, simultaneously
It is connected on respectively by R1, D1 and R2, D2 and step-down rectifier acquisition one is carried out on two live wires for the direct current needed for U1, U2 conducting
Pressure；And one resistance-capacitance depressurization loop of R3, C4 and N formation, through MB6S bridge rectifiers, C3, D5 voltage stabilizing, formed one for relay and
The DC voltage for being not more than 12V that triode is used, only in the case where two photoelectrical coupler secondary are all turned on, relay
The control triode of device just has control voltage, and the purpose for reaching alarm will cause the alarm point to be opened, and can so greatly improve
The security of voltage protector, the practicality improved.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the schematic diagram of Current Transformer Secondary side according to embodiments of the present invention excess voltage protection；
Fig. 2 is the circuit diagram of warning device according to embodiments of the present invention.
In figure：1st, terminals；2nd, signal transacting；3rd, voltage-limiting protection；4th, second protection；5th, control system；6th, sensor；7、
Relay；8th, control output；9th, restorer；10th, warning device；11st, power supply.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained belongs to what the present invention was protected
Scope.
There is provided a kind of Current Transformer Secondary side excess voltage protection for embodiments in accordance with the present invention.
As shown in Figure 1-2, secondary over-voltage protector for current transformer according to embodiments of the present invention, including：Wiring
End 1, constitutes the input of one group of secondary winding in current transformer, and signal transacting 2 is connected with the terminals 1, to Current Mutual Inductance
The voltage signal that secondary winding on device is produced is handled, and voltage-limiting protection 3 is connected with the signal transacting 2, and to described
The voltage that signal transacting 2 exceeds is controlled protection, and second protection 4 is connected with the signal transacting 2, prevents the pressure limiting to protect
Shield 3, which is produced, to be damaged and second protection is carried out to the signal transacting 2, control system 5, including：At sensor 6, with the signal
Reason 2 is connected, and the voltage signal that the signal transacting 2 is sent is sensed, relay 7, is connected with the sensor 6；Control
Output 8, is connected, restorer 9 with the sensor 6, is connected with the control system 5, allows the control system 5 to be in work shape
State, warning device 10 is connected, the warning device 10 includes turning circuit simultaneously with the control output 8 and the relay 7
First, turning circuit two, decompression voltage regulator and detection circuit.
The turning circuit one include three-phase electrical input U, resistance R1, diode D1, electric capacity C1, photoelectrical coupler U1 and
Zero line N, the three-phase electrical input U are connected with described resistance R1 one end, the resistance R1 other ends and diode D1 sun
Pole is connected, and anode of the diode D1 negative electrodes respectively with described electric capacity C1 one end and the photoelectrical coupler U1 is connected, described
The electric capacity C1 other ends and the photoelectrical coupler U1 negative electrode are connected with the zero line N respectively.
The turning circuit two include three-phase electrical input V, resistance R2, diode D2, electric capacity C2, photoelectrical coupler U2 and
Zero line N, the three-phase electrical input V are connected with described resistance R2 one end, the resistance R2 other ends and diode D2 sun
Pole is connected, and anode of the diode D2 negative electrodes respectively with described electric capacity C2 one end and the photoelectrical coupler U2 is connected, described
The electric capacity C2 other ends and the photoelectrical coupler U2 negative electrode are connected with the zero line N respectively.
The decompression voltage regulator includes three-phase electrical input W, resistance R3, electric capacity C4, bridge rectifier MB6S, electric capacity C3
It is connected with diode D5, the three-phase electrical input W with described electric capacity C4 one end, the electric capacity C4 other ends and the bridge-type are whole
Stream device MB6S pin points 1 are connected, and the bridge rectifier MB6S pin points 2 are cloudy with described electric capacity C3 one end and the diode D5 respectively
Pole is connected, and the electric capacity C3 other ends and the diode D5 anodes are connected with the bridge rectifier MB6S pin points 4 respectively, institute
Bridge rectifier MB6S pin points 3 are stated to be connected with the zero line N.
The detection circuit includes resistance R4, resistance R5, diode D3, diode D6, relay K1 and triode Q1, institute
State resistance R4 to be connected with the photoelectrical coupler U1 colelctor electrodes, the photoelectrical coupler U1 emitter stages and the photoelectrical coupler U2
Colelctor electrode is connected, and the photoelectrical coupler U2 emitter stages are connected with the triode Q1 base stages, the triode Q1 colelctor electrodes point
It is not connected with the diode D6 negative electrodes, the diode D3 anodes and described relay K1 one end, the diode D6 anodes
It is connected with described resistance R5 one end, the resistance R5 other ends, the diode D3 negative electrodes and the relay K1 other ends point
It is not connected with the bridge rectifier MB6S pin points 2, the triode Q1 emitter stages connect with the bridge rectifier MB6S pin points 4
Connect, the relay K1 adhesive faces be provided with unlimited auxiliary contact NO1, normally opened auxiliary contact NO2, often spare time auxiliary contact NC1 and
Normal spare time auxiliary contact NC2.
In addition, in one embodiment, the model YGC-FX of sensor 6.
In addition, in one embodiment, the relay 7 is parallel way with the control output 8.
In addition, in one embodiment, the diode D5 is voltage-regulator diode, the diode D6 is light-emitting diodes
Pipe.
In addition, in one embodiment, the photoelectrical coupler U1 and photoelectrical coupler U2 is respectively Q817 photoelectricity
Coupler.
In addition, in one embodiment, the triode Q1 is MMBT3904 triodes.
In addition, in one embodiment, the bridge rectifier MB6S includes four diode D4, per two neighboring described
The diode D4 is provided between bridge rectifier MB6S pin points, the bridge rectifier MB6S pin points 4 connect two pole
Pipe D4 anodes, the bridge rectifier MB6S pin points 2 connect the diode D4 negative electrodes.
In summary, by means of the above-mentioned technical proposal of the present invention, signal transacting is to secondary on current transformer first
The voltage signal that winding is produced carries out discrimination conduction, and voltage-limiting protection 3 and second protection 4 can prevent the production of overvoltage phenomenon in advance
It is raw, the power supply 11 and restorer 9 being connected with control system 5, the former is that control system 5 is powered, and the latter can allow at control system 5
In the working condition normally run, one is obtained while being connected on respectively on two live wires by R1, D1 and R2, D2 and carrying out step-down rectifier
DC voltage needed for individual confession U1, U2 conducting；And one resistance-capacitance depressurization loop of R3, C4 and N formation, through MB6S bridge rectifiers, C3,
D5 voltage stabilizings, form a DC voltage for being not more than 12V used for relay and triode, only in two photoelectrical couplers
In the case that secondary is all turned on, the control triode of relay 7 just has control voltage, and the purpose for reaching alarm will cause the report
Alert device point is opened, and can so substantially increase the security of voltage protector, the practicality improved.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (7)
1. a kind of secondary over-voltage protector for current transformer, it is characterised in that including：
Terminals（1）, constitute the input of one group of secondary winding in current transformer；
Signal transacting（2）, with the terminals（1）Connection, enters to the voltage signal that the secondary winding on current transformer is produced
Row processing；
Voltage-limiting protection（3）, with the signal transacting（2）Connection, and to the signal transacting（2）The voltage exceeded is controlled
Protection；
Second protection（4）, with the signal transacting（2）Connection, prevents the voltage-limiting protection（3）Produce damage and to the signal
Processing（2）Carry out second protection；
Control system（5）, including：Sensor（6）, with the signal transacting（2）Connection, to the signal transacting（2）Send
Voltage signal is sensed；Relay（7）, with the sensor（6）Connection；Control output（8）, with the sensor（6）Even
Connect；
Restorer（9）, with the control system（5）Connection, allows the control system（5）It is in running order；
Warning device（10）, exported with the control（8）With the relay（7）Connect simultaneously, the warning device（10）Bag
Include turning circuit one, turning circuit two, decompression voltage regulator and detection circuit；
The turning circuit one includes three-phase electrical input U, resistance R1, diode D1, electric capacity C1, photoelectrical coupler U1 and zero line
N, the three-phase electrical input U is connected with described resistance R1 one end, and the resistance R1 other ends connect with the diode D1 anodes
Connect, anode of the diode D1 negative electrodes respectively with described electric capacity C1 one end and the photoelectrical coupler U1 is connected, the electric capacity
The C1 other ends and the photoelectrical coupler U1 negative electrode are connected with the zero line N respectively；
The turning circuit two includes three-phase electrical input V, resistance R2, diode D2, electric capacity C2, photoelectrical coupler U2 and zero line
N, the three-phase electrical input V is connected with described resistance R2 one end, and the resistance R2 other ends connect with the diode D2 anodes
Connect, anode of the diode D2 negative electrodes respectively with described electric capacity C2 one end and the photoelectrical coupler U2 is connected, the electric capacity
The C2 other ends and the photoelectrical coupler U2 negative electrode are connected with the zero line N respectively；
The decompression voltage regulator includes three-phase electrical input W, resistance R3, electric capacity C4, bridge rectifier MB6S, electric capacity C3 and two
Pole pipe D5, the three-phase electrical input W are connected with described electric capacity C4 one end, the electric capacity C4 other ends and the bridge rectifier
MB6S pin points 1 are connected, and the bridge rectifier MB6S pin points 2 connect with described electric capacity C3 one end and the diode D5 negative electrodes respectively
Connect, the electric capacity C3 other ends and the diode D5 anodes are connected with the bridge rectifier MB6S pin points 4 respectively, the bridge
Formula rectifier MB6S pin points 3 are connected with the zero line N；
The detection circuit includes resistance R4, resistance R5, diode D3, diode D6, relay K1 and triode Q1, the electricity
Resistance R4 is connected with the photoelectrical coupler U1 colelctor electrodes, the photoelectrical coupler U1 emitter stages and the photoelectrical coupler U2 current collections
Pole is connected, and the photoelectrical coupler U2 emitter stages are connected with the triode Q1 base stages, the triode Q1 colelctor electrodes respectively with
The diode D6 negative electrodes, the diode D3 anodes and the connection of described relay K1 one end, the diode D6 anodes and institute
State resistance R5 one end connection, the resistance R5 other ends, the diode D3 negative electrodes and the relay K1 other ends respectively with
The bridge rectifier MB6S pin points 2 are connected, and the triode Q1 emitter stages are connected with the bridge rectifier MB6S pin points 4,
The relay K1 adhesive faces are provided with unlimited auxiliary contact NO1, often normally opened auxiliary contact NO2, spare time auxiliary contact NC1 and normal spare time
Auxiliary contact NC2.
2. a kind of Current Transformer Secondary side excess voltage protection according to claim 1, it is characterised in that the biography
Sensor（6）Model YGC-FX.
3. a kind of Current Transformer Secondary side excess voltage protection according to claim 1, it is characterised in that it is described after
Electrical equipment（7）Exported with the control（8）For parallel way.
4. a kind of Current Transformer Secondary side excess voltage protection according to claim 1, it is characterised in that described two
Pole pipe D5 is voltage-regulator diode, and the diode D6 is light emitting diode.
5. a kind of Current Transformer Secondary side excess voltage protection according to claim 1, it is characterised in that the light
The electric coupler U1 and photoelectrical coupler U2 is respectively Q817 photoelectrical couplers.
6. a kind of Current Transformer Secondary side excess voltage protection according to claim 1, it is characterised in that described three
Pole pipe Q1 is MMBT3904 triodes.
7. a kind of Current Transformer Secondary side excess voltage protection according to claim 1, it is characterised in that the bridge
Formula rectifier MB6S includes being provided with described two between four diode D4, every two neighboring bridge rectifier MB6S pin points
Pole pipe D4, the bridge rectifier MB6S pin points 4 connect the diode D4 anodes, and the bridge rectifier MB6S pin points 2 connect
Connect the diode D4 negative electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710529054.0A CN107317304A (en) | 2017-07-01 | 2017-07-01 | A kind of Current Transformer Secondary dypass voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710529054.0A CN107317304A (en) | 2017-07-01 | 2017-07-01 | A kind of Current Transformer Secondary dypass voltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107317304A true CN107317304A (en) | 2017-11-03 |
Family
ID=60180471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710529054.0A Pending CN107317304A (en) | 2017-07-01 | 2017-07-01 | A kind of Current Transformer Secondary dypass voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107317304A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202649375U (en) * | 2012-07-25 | 2013-01-02 | 哈尔滨三联药业有限公司 | Open circuit alarm device |
| CN203513016U (en) * | 2013-08-22 | 2014-04-02 | 天津豪雅科技发展有限公司 | Power supply open-phase protection device of lift control cabinet |
| CN203894338U (en) * | 2014-04-29 | 2014-10-22 | 深圳东方泰和科技有限公司 | Three-phase failure power-off independent alarm device |
| CN205489502U (en) * | 2016-01-15 | 2016-08-17 | 杭州超耐德科技有限公司 | Secondary overvoltage protection device of current transformer |
-
2017
- 2017-07-01 CN CN201710529054.0A patent/CN107317304A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202649375U (en) * | 2012-07-25 | 2013-01-02 | 哈尔滨三联药业有限公司 | Open circuit alarm device |
| CN203513016U (en) * | 2013-08-22 | 2014-04-02 | 天津豪雅科技发展有限公司 | Power supply open-phase protection device of lift control cabinet |
| CN203894338U (en) * | 2014-04-29 | 2014-10-22 | 深圳东方泰和科技有限公司 | Three-phase failure power-off independent alarm device |
| CN205489502U (en) * | 2016-01-15 | 2016-08-17 | 杭州超耐德科技有限公司 | Secondary overvoltage protection device of current transformer |
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Application publication date: 20171103 |