CN204333889U - A kind of earth leakage protective device - Google Patents
A kind of earth leakage protective device Download PDFInfo
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- CN204333889U CN204333889U CN201420726932.XU CN201420726932U CN204333889U CN 204333889 U CN204333889 U CN 204333889U CN 201420726932 U CN201420726932 U CN 201420726932U CN 204333889 U CN204333889 U CN 204333889U
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- 230000001681 protective effect Effects 0.000 title claims abstract description 19
- 230000004224 protection Effects 0.000 abstract description 13
- 230000035939 shock Effects 0.000 abstract description 3
- 230000007935 neutral effect Effects 0.000 abstract description 2
- 230000001012 protector Effects 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a kind of earth leakage protective device, comprise drive circuit, amplifier 1, power supply and ac contactor coil.The utility model is applicable to the low-voltage network of transformer neutral point ground connection, as indirect electric leakage and the electrical shock protection of overall or large branch system, and realizes its tactile creepage protection function with A.C. contactor cooperation, safe and reliable.
Description
Technical field
The utility model relates to a kind of electric safety device, specifically a kind of earth leakage protective device.
Background technology
Along with the progressively transformation of urban and rural power grids, it is the inexorable trend of safe power supply to electric power system use cascade protection, earth leakage protective device and drive circuit thereof are as a kind of electric safety device, be arranged in low-voltage circuit, the operating current value of protector restriction is reached once line electrical leakage stream, action within the time limited, auto power off is protected; Establishing earth leakage protective device and drive circuit thereof to be one of effective measures preventing accident of human electric shock in low-voltage distribution system, is also the technical measures prevented because electric leakage causes electrical fire and electric equipment to damage; In the electric power system of cascade protection, the selected of the desired action current of protective device at different levels and operate time or time delay should be resolved, to reach the coordination object of protection at different levels, in China's electric network reconstruction, first class of protection and total protector that leaks electricity are configured in the low pressure general supply side of distribution transformer, are total protections of the whole network, and the selection of its residual operating current value is to prevent the electrical shock protection of indirect contact, secondary or three-level protective system, more effectively can prevent human electric shock and leakage fire accident; This grading protection system; the effect of movement is played in mode gets an electric shock electric leakage accident; but sometimes also there will be one, two pole protector actions simultaneously; cause large-area power-cuts; because suddenly ground connection or human electric shock's accident cause collisions of pulses to become leakage current greatly to the operating current threshold values exceeding overall protector and adjust, may making one, two, three pole earth leakage protective devices and drive circuit action simultaneously thereof.
Utility model content
The purpose of this utility model is to provide a kind of safe and reliable earth leakage protective device, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of earth leakage protective device, comprise drive circuit, amplifier 1, power supply and ac contactor coil, described drive circuit connects electric leakage actuating relay respectively, comparator, pulse comparator and trigger, described amplifier 1 connects zero-sequence transformer respectively, comparator, amplifying circuit, phase inverter and amplifier 2, amplifier 2 also connects phase inverter and pulse comparator respectively, pulse comparator also connects trigger, the described amplifying circuit other end connects the display of ammeter leakage current, described power supply connects power transformer and half-wave rectifying circuit respectively, described ac contactor coil connects 3V rectification low-voltage circuit respectively, half-wave rectifying circuit and electric leakage actuating relay, described power transformer also connects electric leakage actuating relay by regulator rectifier circuit.
Described drive circuit comprises relay J, light-emitting diode D9, resistance R1 and electric capacity C1, described resistance R1 one end connects V1 end and resistance R3, the resistance R1 other end is contact resistance R2 and diode D1 positive pole respectively, the resistance R2 other end connects electric capacity C1, the electric capacity C1 other end connects diode D10 negative pole respectively, electric capacity C2, diode D7 negative pole and resistance R6, the resistance R6 other end connects electric capacity C3 respectively, resistance R7 and triode VT2 base stage, the resistance R7 other end connects V2 end by diode D6 positive pole, described triode VT2 emitter is connecting triode VT1 emitter respectively, the electric capacity C3 other end, diode D7 positive pole, the electric capacity C2 other end and resistance R4, the resistance R4 other end connects diode D10 positive pole and light-emitting diode D9 negative pole respectively, diode D9 positive pole connects diode D3 negative pole respectively, diode D4 negative pole and diode D5 negative pole, diode D3 positive pole connects V3 end, diode D4 positive pole connects V4 end, diode D5 positive pole connects V5 end, described diode D1 negative pole is contact resistance R4 respectively, light-emitting diode D8 negative pole and triode VT1 collector electrode, light-emitting diode D8 positive pole connects relay J coil, the relay J coil other end connects diode D2 negative pole and V6 end respectively, the diode D2 positive pole contact resistance R4 other end, J1-1 two ends, described relay J contact connect V7 end and V8 end respectively.
As further program of the utility model: described pulse comparator is made up of positive pulse comparator and negative pulse comparator.
As further program of the utility model: described diode D1 ~ D3 forms OR circuit.
As the utility model further scheme: described trigger adopts d type flip flop.
Compared with prior art; the beneficial effects of the utility model are: the utility model is applicable to the low-voltage network of transformer neutral point ground connection; as indirect electric leakage and the electrical shock protection of overall or large branch system, and realize its tactile creepage protection function with A.C. contactor cooperation, safe and reliable.
Accompanying drawing explanation
Fig. 1 is a kind of circuit structure block diagram of earth leakage protective device;
Fig. 2 is the drive circuit circuit diagram in a kind of earth leakage protective device.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1 ~ 2, in the utility model embodiment, a kind of earth leakage protective device, comprise drive circuit, amplifier 1, power supply and ac contactor coil, described drive circuit connects electric leakage actuating relay respectively, comparator, pulse comparator and trigger, described amplifier 1 connects zero-sequence transformer respectively, comparator, amplifying circuit, phase inverter and amplifier 2, amplifier 2 also connects phase inverter and pulse comparator respectively, pulse comparator also connects trigger, the described amplifying circuit other end connects the display of ammeter leakage current, described power supply connects power transformer and half-wave rectifying circuit respectively, described ac contactor coil connects 3V rectification low-voltage circuit respectively, half-wave rectifying circuit and electric leakage actuating relay, described power transformer also connects electric leakage actuating relay by regulator rectifier circuit.
Described drive circuit comprises relay J, light-emitting diode D9, resistance R1 and electric capacity C1, described resistance R1 one end connects V1 end and resistance R3, the resistance R1 other end is contact resistance R2 and diode D1 positive pole respectively, the resistance R2 other end connects electric capacity C1, the electric capacity C1 other end connects diode D10 negative pole respectively, electric capacity C2, diode D7 negative pole and resistance R6, the resistance R6 other end connects electric capacity C3 respectively, resistance R7 and triode VT2 base stage, the resistance R7 other end connects V2 end by diode D6 positive pole, described triode VT2 emitter is connecting triode VT1 emitter respectively, the electric capacity C3 other end, diode D7 positive pole, the electric capacity C2 other end and resistance R4, the resistance R4 other end connects diode D10 positive pole and light-emitting diode D9 negative pole respectively, diode D9 positive pole connects diode D3 negative pole respectively, diode D4 negative pole and diode D5 negative pole, diode D3 positive pole connects V3 end, diode D4 positive pole connects V4 end, diode D5 positive pole connects V5 end, described diode D1 negative pole is contact resistance R4 respectively, light-emitting diode D8 negative pole and triode VT1 collector electrode, light-emitting diode D8 positive pole connects relay J coil, the relay J coil other end connects diode D2 negative pole and V6 end respectively, the diode D2 positive pole contact resistance R4 other end, J1-1 two ends, described relay J contact connect V7 end and V8 end respectively.
Pulse comparator is made up of positive pulse comparator and negative pulse comparator.
Diode D1 ~ D3 forms OR circuit.
Trigger adopts d type flip flop.
Operation principle of the present utility model is: overall protector arranges decision circuitry in the funtion part of pulse protection act; when protector detects leakage current pulse; operating current setting value; the pulse action circuit part of overall protector enters the deferred action of 0.2S; if there is electrical leakage breaking pulses generation in 0.2S; decision circuitry will make 0.2S time delay stop; overall protector will be failure to actuate and return safe operation device; if electrical leakage breaking pulses generation do not detected within time of delay; when time delay 0.2S; overall protector, with regard to action, cuts off power supply.
For drive circuit, when normal power transmission operating state, triode VT1 is in saturation conduction state, relay J coil has On current, the relay J contact J-1 closing of contact, ac contactor coil is switched on power, the normal power transmission of protected system, diode D1 ~ D3 forms OR circuit, diode D1 inputs slow leakage circuit signal, diode D2 and D2 inputs the human body contact pulse signal of sudden change, when three has one of them to be in high level, will by light-emitting diode D9, diode D10 and resistance R6 makes electric capacity C3 charge, when within a certain period of time, electric capacity C3 is charged to the conducting current potential of triode VT2, triode VT2 conducting, the collector electrode of triode VT2 and the base stage of triode VT1 are in electronegative potential, triode VT1 becomes cut-off from conducting, relay J coil blackout, make ac contactor coil power-off and trip operation, cut off the electricity supply.When trigger impulse produces; the high level that one of positive negative pulse stuffing comparator exports makes trigger export high level; charge in delay time at electric capacity C3; if two, three-level protective device action, then the protector action of last pole is cut off emergency power supply end and is produced the pulse contrary with leakage current pulse, then this pulse makes trigger again overturn output low level; that electric capacity C3 and triode VT2 base stage maintain low level; the collector electrode of triode VT1 is in low level, continues to maintain power transmission, realizes arbitration functions with this.
Claims (4)
1. an earth leakage protective device, comprise drive circuit, amplifier 1, power supply and ac contactor coil, it is characterized in that, described drive circuit connects electric leakage actuating relay respectively, comparator, pulse comparator and trigger, described amplifier 1 connects zero-sequence transformer respectively, comparator, amplifying circuit, phase inverter and amplifier 2, amplifier 2 also connects phase inverter and pulse comparator respectively, pulse comparator also connects trigger, the described amplifying circuit other end connects the display of ammeter leakage current, described power supply connects power transformer and half-wave rectifying circuit respectively, described ac contactor coil connects 3V rectification low-voltage circuit respectively, half-wave rectifying circuit and electric leakage actuating relay, described power transformer also connects electric leakage actuating relay by regulator rectifier circuit,
Described drive circuit comprises relay J, light-emitting diode D9, resistance R1 and electric capacity C1, described resistance R1 one end connects V1 end and resistance R3, the resistance R1 other end is contact resistance R2 and diode D1 positive pole respectively, the resistance R2 other end connects electric capacity C1, the electric capacity C1 other end connects diode D10 negative pole respectively, electric capacity C2, diode D7 negative pole and resistance R6, the resistance R6 other end connects electric capacity C3 respectively, resistance R7 and triode VT2 base stage, the resistance R7 other end connects V2 end by diode D6 positive pole, described triode VT2 emitter is connecting triode VT1 emitter respectively, the electric capacity C3 other end, diode D7 positive pole, the electric capacity C2 other end and resistance R4, the resistance R4 other end connects diode D10 positive pole and light-emitting diode D9 negative pole respectively, diode D9 positive pole connects diode D3 negative pole respectively, diode D4 negative pole and diode D5 negative pole, diode D3 positive pole connects V3 end, diode D4 positive pole connects V4 end, diode D5 positive pole connects V5 end, described diode D1 negative pole is contact resistance R4 respectively, light-emitting diode D8 negative pole and triode VT1 collector electrode, light-emitting diode D8 positive pole connects relay J coil, the relay J coil other end connects diode D2 negative pole and V6 end respectively, the diode D2 positive pole contact resistance R4 other end, J1-1 two ends, described relay J contact connect V7 end and V8 end respectively.
2. a kind of earth leakage protective device according to claim 1, is characterized in that, described pulse comparator is made up of positive pulse comparator and negative pulse comparator.
3. a kind of earth leakage protective device according to claim 1, is characterized in that, described diode D1 ~ D3 forms OR circuit.
4. a kind of earth leakage protective device according to claim 1, is characterized in that, described trigger adopts d type flip flop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420726932.XU CN204333889U (en) | 2014-11-28 | 2014-11-28 | A kind of earth leakage protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420726932.XU CN204333889U (en) | 2014-11-28 | 2014-11-28 | A kind of earth leakage protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204333889U true CN204333889U (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420726932.XU Expired - Fee Related CN204333889U (en) | 2014-11-28 | 2014-11-28 | A kind of earth leakage protective device |
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| Country | Link |
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| CN (1) | CN204333889U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137256A (en) * | 2015-07-16 | 2015-12-09 | 国网浙江义乌市供电公司 | Leakage current monitor control device |
-
2014
- 2014-11-28 CN CN201420726932.XU patent/CN204333889U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137256A (en) * | 2015-07-16 | 2015-12-09 | 国网浙江义乌市供电公司 | Leakage current monitor control device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150513 Termination date: 20151128 |