CN2149703Y - Multi-function double-protction leakage protector for three-phase power-supply - Google Patents
Multi-function double-protction leakage protector for three-phase power-supply Download PDFInfo
- Publication number
- CN2149703Y CN2149703Y CN 93236209 CN93236209U CN2149703Y CN 2149703 Y CN2149703 Y CN 2149703Y CN 93236209 CN93236209 CN 93236209 CN 93236209 U CN93236209 U CN 93236209U CN 2149703 Y CN2149703 Y CN 2149703Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- protection
- electric leakage
- functional
- phase electric
- 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 discloses a multi-function double-protection leakage protector for the three-phase power-supply, comprising a main protection circuit which is composed of a current mutual inductor, a signal processing circuit and a control execution circuit, and a power circuit can supply the power supply to the whole protector. The utility model is characterized in that a backup protection circuit is connected in parallel with the main protection circuit, the backup protection circuit is connected with a leakproof protection return circuit, and a leakage balance adjusting button circuit is arranged in the protection circuit. The circuit is also connected with a phase lack protection circuit. The utility model has the advantage of multifunction, high reliability, high safety and power saving, and the multi-function double-protection leakage protector for the three-phase power-supply can lessen the burden of the electricity managing personnel.
Description
The utility model relates to the emergency protective circuit device in generating, power transformation or the distribution technique of electric power; it is a kind of automatic disconnection emergency protective circuit device that the undesirable variation that departs from the normal electrical working condition is directly reacted; specifically, be a kind of emergency protective circuit device that overcurrent, the phase failure are reacted.
Existing three-phase electric leakage protection device is single protected mode.Because rural power equipment operation inclement condition; simultaneously also because many manufacturers element screening difference and quality problems; the spoilage of general protector is very high; like this; three-phase electric leakage protection device as the total protection of rural area low-voltage power line; will make large stretch of circuit lose protective effect, thereby might cause the generation of electric shock accidents.In Ministry of Water Resources and Power Industry's " earth leakage protective device rural area installation and operation rules ", though regulation will regularly be tested protector, if administrative staff's pin has carelessness, protector breaks down, and just produces serious consequence most probably.
It is many that the purpose of this utility model provides a kind of function, the reliability height, helps in time to find fault, more effectively avoids touching the electric leakage security incident, guarantees multi-functional two protection three-phase electric leakage protection devices of safe power supply.
Technical solution of the present utility model is: a kind of multi-functional two protection three-phase electric leakage protection devices; comprise the main protection circuit of forming by the current transformer, signal processing circuit, the control executive circuit that detect the leak shock situation; a power circuit provides power supply for the whole protecting device; the difference of itself and prior art is: have a protective current definite value to be higher than the backup protection circuit and the main protection circuit of main protection circuit and connect; be connected to proof and electric leakage-proof safety in the backup protection circuit and move back the fortune circuit, be provided with the electric leakage balance in the protective circuit and adjust button circuit.
Stand-by circuit in the utility model or main protection circuit are connected to an open-phase protection circuit.Certainly, also can not connect open-phase protection circuit, or changing-over, other suitable defencive function circuit of adjunction.
Comprise a current transformer in the open-phase protection circuit in the utility model, current transformer links to each other with a three-phase electric leakage balance adjustment circuit.Certainly, open-phase protection circuit also can adopt other suitable circuit structure forms.
The main protection circuit that is connected to the backup protection circuit in the utility model is connected to the protector start-up circuit, also can not connect certainly or other appropriate circuitry of changing-over.
Comprise an enabling signal processing integrated circuit in the utility model protector start-up circuit; the enabling signal processing integrated circuit is connected to the moment delay circuit; relay of enabling signal processing integrated circuit control, the starting resistor input circuit work that one of relay control links to each other with A.C. contactor.Certainly, the protector start-up circuit also can adopt other suitable circuit structure forms.
A.C. contactor in the utility model is connected to low-voltage direct current holding circuit.Certainly, can not connect yet.
A current transformer is arranged in the backup protection circuit in the utility model; amplifying circuit is accepted the signal that current transformer sends into and amplifies to export a voltage comparator to; voltage comparator also is connected to reference voltage generating circuit; an executive circuit is accepted the voltage comparator output signal; and the relay that drives a protected power circuit break-make of control produces corresponding actions, and the protection contact of this relay is connected in series with corresponding protection contact in the main protection circuit.Certainly, the backup protection circuit also can adopt other suitable circuit structure forms.
Executive circuit in the utility model is connected to the delay circuit of time-delay numerical value greater than main protection circuit.Certainly also can adopt other suitable delay circuits.
Executive circuit output in the utility model is connected to indicating circuit.Certainly, also can not connect indicating circuit or connect other suitable functional circuits.
Electric leakage balance adjustment button circuit in the utility model comprises and imports the resistance that regulator potentiometer is connected with the signal of detection of electrical leakage Current Transformer parallel connection, and this resistance directly connect the electric leakage balance adjustment button of power supply negative terminal.Certainly, also can adopt other appropriate circuit arrangement forms.
The utility model has the advantages that: each major function circuit all adopts integrated circuit, has not only simplified production and debug process, and complete machine structure is simple, and cost is low, and interchangeability is strong, stable and reliable working performance, and debugging keeps in repair, uses more convenient.Because the improvement of the reclosing circuit in the main protection circuit; both improved security reliability; improved power supply reliability again; many troublesome poerations of electrician have been reduced; make things convenient for the user, improved power supply quality, be provided with Monitory circuit for electricity leakage, be convenient to understand at any time the electric leakage situation; and employing Monitory circuit for electricity leakage and signal amplification circuit are shared, make circuit structure simple and reliable on the more perfect and practical basis of defencive function.Especially the utility model is provided with a cover stand-by protection circuit; most of element and former main protection circuit are shared; and the backup protection circuit also can monitor the working condition of main protection circuit; in case the backup protection circuit is had an effect; can in time remind the electricity-management personnel to take corresponding measure again, also play anti-backup protection effect of touching the electric leakage accident simultaneously.The utility model prevents that in addition earth leakage protective from moving back the fortune function, makes earth leakage protective more reliable.Also be added with open-phase protection circuit in the utility model, thereby have phase failure protection function simultaneously.Also set up start-up circuit and low-voltage direct current holding circuit, move more reliable, safety, the economize on electricity.
The utility model is described in further detail below in conjunction with drawings and Examples:
Accompanying drawing is the multi-functional three-phase electric leakage protection device electrical block diagrams of a kind of two protections of the present utility model.
Accompanying drawing has been described an embodiment of the present utility model.This embodiment is that a kind of numeric type is the protector of the additional open-phase protection of current mode earth leakage protective.Its earth leakage protective part operation condition is the setting current value of electric leakage resultant current greater than protector.When secondary side's winding L HI of zero sequence current mutual inductor induces triggering signal; by operational amplifier I1(1/4LM324) amplify; and make its output in high potential; this high potential is by diode D5; resistance R 5; R7; R8; diode D8 input comparison integrated circuit I2(1/4LM324) input negative terminal; and integrated circuit I2 anode adds a reference voltage; when the negative terminal current potential of integrated circuit I2 is higher than anode; integrated circuit I2 exports electronegative potential; send into execution integrated circuit A1(model 555 by resistance R 16) input, after anti-phase amplification, make integrated circuit A1 output high potential; promote relay 1J action; the normally closed contact 1J1 of relay 1J disconnects, and cuts off the power supply of the A.C. contactor CJ of control protection power circuit, reaches the protection purpose.In integrated circuit A1 output high potential, charge to capacitor C6 by resistance R 19, the delay circuit of being made up of resistance R 18, capacitor C 4 is kept integrated circuit A1 output and is kept high potential simultaneously, make relay 1J continue adhesive, after waiting to reach delay time, trigger upset relay 1J and discharge, reach single shot reclosing.When fault or electric shock situation still exist; above-mentioned situation circulation takes place; relay is kept adhesive; make integrated circuit A1 be output as high potential; simultaneously; continue by resistance R 19 to capacitor C 6 chargings; when being charged to integrated circuit I3(1/4LM324) anode when being higher than the negative terminal current potential; integrated circuit I3 is output as high potential makes integrated circuit I2 output still be electronegative potential, thereby integrated circuit A1 output is a high potential, 19 pairs of capacitor C 6 boost charges of the resistance R that worked again; so integrated circuit I3 output is always high potential; form the circulation locking, thereby permanent tripping operation reaches the purpose of protecting electric shock person.When fault or electric shock person in the time-delay reclosure time (be generally 15-30 second) disappear or break away from power supply, circuit can carry out reclosing.And existing protector can produce permanent tripping operation when transient fault electric leakage situation takes place in second once more at 15-30, at this moment away from the electrician of power distribution room, must go to carry out the manual reset operation, and is very inconvenient.Present embodiment is provided with the quick discharging circuit of being made up of resistance R 20, diode D14, makes locking capacitor C 6 bleed off a part of electric charge at short notice, when occurring the transient fault electric leakage outside 1 second once more or getting an electric shock, can realize overlapping.Because what the transient fault likelihood ratio 15-30 in 1 second occurred in second greatly reduces, thereby has improved the power supply reliability of supply line, has reduced many troublesome poerations of electrician, is particularly useful for mountain area and numerous rural subscribers.Resistance R 7 is formed the triggering delay circuit with capacitor C 3, can reach the designing requirement of adjusting by adjusting the size of capacitor C 3, with the cascade protection of cooperated power supply circuit, reaches and jump cascade protection earlier under failure condition, thereby significantly reduce the purpose that total protection is tripped.
The backup protection circuit adopts the deferred action form and slightly improves the way of protective current definite value; to distinguish with main protection circuit, designing requirement meets the requirement of GB GB6829, under the normal condition; backup protection is failure to actuate, and backup protection comprises that to main protection circuit the power unit working condition monitors.The contact output of relay 1J, 3J is adopted with the door form and is controlled.Break down as power unit, because relay 3J can not adhesive, contact disconnects, and 3J1 disconnects, and circuit can't close a floodgate and send electricity, so can play the monitoring effect to the power unit working condition.Backup protection because of being furnished with indicating circuit, can be differentiated failure condition as after moving for administrative staff when recovering to send electricity, in time take corresponding measure.
When getting an electric shock or electric leakage when reaching certain numerical value, secondary side's winding L H2 of zero sequence current mutual inductor induces triggering signal, by integrated operational amplifier I5(1/4LM324) amplify, and make its output in high potential, this high potential is by diode D17, D19, resistance R 24, R27 input comparison amplification circuit I6(1/4LM324) negative input end, and make anode add a reference voltage, when the negative terminal current potential of integrated circuit I6 is higher than anode, integrated circuit I6 exports electronegative potential, send into execution integrated circuit A2(CB555 by resistance R 26) input, after anti-phase amplification, make integrated circuit A2 output high potential, because this circuit adopts the another kind of connection of CB555 load, during operate as normal, relay 3J adhesive can be sent circuit.When integrated circuit A2 output high potential, relay 3J discharges, thereby the contact 3J1 of relay 3J is opened, and the tripping operation of control power transmission sequence reaches the protection purpose.Capacitor C 11 is a delay capacitor, and the selection of this electric capacity is different with main protection circuit, and its numerical value is much larger than main protection circuit.6,7 pin at integrated circuit A1 are connected to capacitor C 4 to power supply negative terminal, play the reclosing time-lag action.
Also be provided with in the present embodiment and prevent that earth leakage protective from moving back the fortune circuit.The zero sequence current mutual inductor of GENERAL TYPE protector all adopts the connector pattern; so the low-voltage variation device is in service in the rural area; when big or circuit has fault when the line electrical leakage electric current; power supply can not get protection; might take place this moment artificially that the zero sequence current mutual inductor plug is loosening; make protector out of service, lost due protective effect.In the present embodiment prevent that earth leakage protective from moving back that the fortune circuit can eliminate that protector takes out or loosening back produces and moves back the fortune phenomenon.Its circuit form is controlled contact 1,2 combination hubs among the figure at the power supply of relay 3J by the shorting stub of external plug, when external plug took out, relay 3J coil did not have positive supply, so relay 3J can not adhesive, A.C. contactor CJ can not adhesive thus, and circuit can't send.
Present embodiment also is provided with start-up circuit, comprises integrated circuit A4(model 555) and accessory circuit.The work of integrated circuit A4 is subjected to the control of signalizing activity amplifier I2, by the two ends of resistance R 35 input ic A4, is subjected to integrated circuit A1 output circuit by capacitor C 17 controls, to form complete start-up circuit simultaneously again.Resistance R 36, capacitor C 15 are formed the moment delay circuit, moment adhesive by relay 2J, control C cross streams electricity by diode D28 rectification, is imported higher starting resistor by resistance R 46 inputs, so that A.C. contactor CJ adhesive, relay 2J discharges subsequently, then by diode D26, D27, and capacitor C 18, the low-voltage direct current holding circuit that resistance R 45 is formed is supplied with A.C. contactor CJ operating voltage, is generally about 4V.
In the present embodiment also by resistance R 41, R42, R43; potentiometer W5, W6, W7 have formed three-phase electric leakage balance adjustment circuit; in the input power supply, lose arbitrary phase time; the just disequilibrium effect of balanced balanced current of input current transformer winding L H3; and it is bigger to change amplitude; make the action of three-phase electric leakage protection device, so play the open-phase protection effect.
Also be provided with the electric leakage balance in the present embodiment and adjust button AN3 and AN3 '.When not being provided with this button, if leakage current is big, circuit can't close a floodgate, so adjust difficulty, and after having established this button and related circuit, can under circuit combined floodgate situation, advance the balance adjustment, operation is very convenient in using, physical circuit is series resistance R45, R46 on the signal in parallel with current transformer LH1, LH2 input regulator potentiometer W1, W3, and button AN3, AN3 ' are connected on the tie point of potentiometer W1, W3 and resistance R 45, R46 between the power supply negative terminal.When pressing the button AN3, AN3 ' (interlock of two buttons); resistance R 45, R46 lower end are directly connect power supply negative terminal; the parallel resistance value at input signal detection current transformer LH1, LH2 two ends is reduced; reach the purpose of signal attenuation; reduced protector sensitivity,, be convenient to carry out the balance adjustment so that circuit can send electricity; after button AN3, AN3 ' unclamped, circuit recovered normal operation.
Backup protection circuit in the utility model also can be formed the two protective circuits of formation with other forms of three-phase electric leakage protection device main protection circuit.
Also has power transformer B in the circuit; integrated package of pressure-stabilizing A3; power rectifier diode D1-D4; limiter diode D6; D7; D15; D16; forward diac D8; D11; D12; D17; protection diode D9; D10; D13; D18; D20, feedback resistance R4, electric leakage shows ammeter mA; ammeter damping resistance R6; signal input regulator potentiometer W1; W3, input resistance R1; R27; R33, earth resistance R2; R22; load resistance R3; R23; input voltage sampling resistor R9, divider resistance R10; R11; R12; R13; R25; R26, protective resistance R6; R15; R17; resonant capacitance C1; C10; filter capacitor C2; C7; C8; C9, vibrationproof capacitor C 5; C13, bleeder circuit regulator potentiometer W4; delay capacitor C11; delay circuit resistance R 24, luminous tube D23; resistance R 23 is formed the separating brake indicating circuit, and resistance R 29 is a divider resistance.Resistance R 34, R40 are attenuated input signal resistance.Diode D24, D25 are the shows signal light-emitting diode, and resistance R 32, R42, R37 are current-limiting resistance in the indicating circuit.Circuit breaker 1J is a main protection device output relay, and relay 2J is the start-up control relay.Relay 3J is the backup protection output relay.
Claims (10)
1, a kind of multi-functional two protection three-phase electric leakage protection devices; comprise the main protection circuit of forming by the current transformer, signal processing circuit, the control executive circuit that detect the leak shock situation; a power circuit provides power supply for the whole protecting device; it is characterized in that: have a protective current definite value and time to be higher than the backup protection circuit and the main protection circuit of protective circuit and connect; be connected to proof and electric leakage-proof safety in the backup protection circuit and move back the fortune circuit, be provided with the electric leakage balance in the protective circuit and adjust button circuit.
2, multi-functional two protection three-phase electric leakage protection devices according to claim 1, it is characterized in that: backup protection circuit or main protection circuit are connected to an open-phase protection circuit.
3, multi-functional two protection three-phase electric leakage protection devices according to claim 2 is characterized in that: comprise a current transformer in the open-phase protection circuit, current transformer links to each other with a three-phase electric leakage balance adjustment circuit.
4, according to claim 1 or 2,3 described multi-functional two protection three-phase electric leakage protection devices, it is characterized in that: be connected in the main protection circuit of backup protection circuit and be connected to the protector start-up circuit.
5, multi-functional two protection three-phase electric leakage protection devices according to claim 4; it is characterized in that: comprise an enabling signal processing integrated circuit in the protector start-up circuit; the enabling signal processing integrated circuit connects the moment delay circuit; relay of enabling signal processing integrated circuit control, the starting resistor input circuit work that one of relay control links to each other with A.C. contactor.
6, multi-functional two protection three-phase electric leakage protection devices according to claim 5, it is characterized in that: A.C. contactor is connected to low-voltage direct current holding circuit.
7, according to claim 1 or 2,3 described multi-functional two protection three-phase electric leakage protection devices; it is characterized in that: a current transformer is arranged in the backup protection circuit; amplifying circuit is accepted the signal that current transformer sends into and amplifies to export a voltage comparator to; voltage comparator also is connected to reference voltage generating circuit; an executive circuit is accepted the voltage comparator output signal; and the relay that drives a protected power circuit break-make of control produces corresponding actions, and the protection contact of this relay is connected in series with corresponding protection contact in the main protection circuit.
8, multi-functional two protection three-phase electric leakage protection devices according to claim 7, it is characterized in that: executive circuit is connected to the delay circuit of time-delay numerical value greater than main protection circuit.
9, multi-functional two protection three-phase electric leakage protection devices according to claim 7, it is characterized in that: the executive circuit output is connected to indicating circuit.
10, multi-functional two protection three-phase electric leakage protection devices according to claim 7; it is characterized in that: electric leakage balance adjustment button circuit comprises and imports the resistance that regulator potentiometer is connected with the signal of detection of electrical leakage Current Transformer parallel connection, and this resistance directly connect the electric leakage balance adjustment button of power supply negative terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93236209 CN2149703Y (en) | 1993-02-06 | 1993-02-06 | Multi-function double-protction leakage protector for three-phase power-supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93236209 CN2149703Y (en) | 1993-02-06 | 1993-02-06 | Multi-function double-protction leakage protector for three-phase power-supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2149703Y true CN2149703Y (en) | 1993-12-15 |
Family
ID=33811436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93236209 Expired - Fee Related CN2149703Y (en) | 1993-02-06 | 1993-02-06 | Multi-function double-protction leakage protector for three-phase power-supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2149703Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100574030C (en) * | 2006-09-27 | 2009-12-23 | 鸿富锦精密工业（深圳）有限公司 | Leakage current protecting circuit |
| CN105403802A (en) * | 2014-09-10 | 2016-03-16 | 国网浙江余姚市供电公司 | Method for quickly carrying out electric leakage detection |
-
1993
- 1993-02-06 CN CN 93236209 patent/CN2149703Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100574030C (en) * | 2006-09-27 | 2009-12-23 | 鸿富锦精密工业（深圳）有限公司 | Leakage current protecting circuit |
| CN105403802A (en) * | 2014-09-10 | 2016-03-16 | 国网浙江余姚市供电公司 | Method for quickly carrying out electric leakage detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102005720B (en) | Neutral line breakage detection protection method and device | |
| CN111711276B (en) | Distribution automation intelligence feeder terminal | |
| CN201549868U (en) | Low-voltage switch intelligent controller | |
| CN201360135Y (en) | Intelligent integrated leakage protection device | |
| CN2149703Y (en) | Multi-function double-protction leakage protector for three-phase power-supply | |
| CN103378581A (en) | AFCI comprehensive protecting device | |
| CN102904208A (en) | Leakage breaker | |
| CN2133961Y (en) | Double-protection three-phase electric leakage protector | |
| CN210838466U (en) | Vacuum circuit breaker control circuit for 10kV capacitor | |
| CN2260395Y (en) | Multi-function double protection remote control leakage protector | |
| CN2156609Y (en) | Double-protection multi-function pulse type leakage protector | |
| CN2153893Y (en) | Double protective pulse type leakage protector | |
| CN201904601U (en) | Multifunctional three-phase circuit breaker | |
| CN2133076Y (en) | Integrated three-phase electricity leakage protector | |
| CN206542181U (en) | Intelligent non-pressure release coil controller | |
| CN2304936Y (en) | Multifunctional wide range constant voltage protector | |
| CN216928448U (en) | Control protection switch for preventing tripping | |
| CN109599831A (en) | Low load current automatic detection's earth-leakage protector | |
| CN220155459U (en) | Multifunctional circuit breaker for photovoltaic | |
| CN211720327U (en) | Dual-power automatic switching control device | |
| CN218826923U (en) | Universal circuit breaker | |
| CN2181112Y (en) | Remote control type multi-function double-protecting leakage protector | |
| CN219643589U (en) | Permanent and instantaneous fault compound breaker for high-voltage line | |
| CN211629854U (en) | Circuit breaker protection trip circuit | |
| CN211428987U (en) | Low-voltage circuit breaker protection unit and microcomputer standby power supply automatic switching device regulation and control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |