CN2107080U - Multi-functional three-phase leakage protector - Google Patents
Multi-functional three-phase leakage protector Download PDFInfo
- Publication number
- CN2107080U CN2107080U CN 91230537 CN91230537U CN2107080U CN 2107080 U CN2107080 U CN 2107080U CN 91230537 CN91230537 CN 91230537 CN 91230537 U CN91230537 U CN 91230537U CN 2107080 U CN2107080 U CN 2107080U
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- China
- Prior art keywords
- circuit
- current
- functional
- leakage current
- zero sequence
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a multi-functional three-phase leakage protector, comprising a zero sequence current transformer, a control circuit, an executive circuit and a power circuit. The difference with prior art is that the zero sequence current transformer is provided with two auxiliary square windings, the first auxiliary square winding is connected with the control circuit, and the second auxiliary square winding is connected with a balanced current regulating circuit. The first auxiliary square winding is also connected with a leakage current indicator circuit. The silent running circuit of an alternating current contactor is controlled by the executive circuit and connected with the power circuit. The utility model can be normally operated under the condition of leakage current and large discrepancy of the leakage current, and has the advantages of high reliability, long service life and obvious noise abatement and electricity-economizing effects.
Description
The utility model relates to the emergency protective circuit device in generating, power transformation or the distribution technique field 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 electric current is reacted.
Existing three-phase electric leakage protection device is applied to total protection of the low-voltage power line of vast rural area and part factory.It is to respond in zero sequence current mutual inductor when producing unsymmetrical current and reaching certain numerical value by leakage current; produce triggering signal, and drive executive circuit work, make the power circuit tripping operation through control circuit; reach the purpose of protection, but these existing three-phase electric leakage protection device functions are perfect inadequately.The low-voltage power line of present operation, particularly vast rural line, most of insulation level is poor, and many circuits are aging day by day, and especially in rainy season, existing putting into operation of earth leakage protective device more is a problem.If strengthen the operating current definite value, can make protector lose due protective effect, and, then can make the power supply reliability variation if reduce the operating current definite value, can not keep normal power supply because of protector acts frequently.Above-mentioned contradiction becomes the difficult problem of puzzlement rural power line powering always.The power supply circuit generally is three-phase four-wire system in general export in China rural area, and the load current of three-phase four-wire power supply circuit gets according to kirchhoff first law: ǐ the effect of zero sequence current mutual inductor
A+ ǐ
B+ ǐ
C+ ǐ
N=0, so the magnetic potential that the three-phase and four-line load current produces is zero, i.e. F=(ǐ
A+ ǐ
B+ ǐ
C+ ǐ
N) W=0, zero sequence current mutual inductor pair side output voltage U is zero.As establish: A relatively leakage current is I
0A(comprises the load leakage current); B relatively leakage current is I
0B(comprises the load leakage current); C relatively leakage current is I
0C(comprises the load leakage current); The zero line earth leakage current is I
0N; Leakage current between line is handled by its load form equally.But because each phase insulation level is inconsistent, so F=(ǐ
0A+ ǐ
0B+ ǐ
0C+ ǐ
0N) W is non-vanishing, thereby secondary side's winding of zero sequence current mutual inductor has voltage U output.And China's countryside low-voltage electric distribution line powering scope is big, and the circuit installation quality is poor, and illuminalive power-supply adopts uniline, though can adopt the method for some load balancings to adjust the line insulation level, the leakage current otherness is still bigger.Especially weather has a significant impact leakage current, so the leakage current fluctuation is big, existing three-phase electric leakage protection device is difficult to adapt to.
The purpose of this utility model provide a kind of can be under leakage current and situation about differing greatly thereof bringing normally into operation, and can make the multi-functional three-phase electric leakage protection device that the insensitive phase degree of protector reduces, characteristic is improved.
Technical solution of the present utility model is: a kind of multi-functional three-phase electric leakage protection device; comprise zero sequence current mutual inductor, control circuit, executive circuit, reach power circuit; with the difference of prior art be: zero sequence current mutual inductor has two pair side's windings; first secondary side's winding links to each other with control circuit, and second secondary side's winding links to each other with a balanced balanced current regulating circuit.
First secondary side's winding in the utility model also links to each other with a leakage current indicating circuit.
Leakage current indicating circuit in the utility model by indication amplifier, rectification circuit, and ammeter form.
There is ac contactor silent operation circuit to be subjected to executive circuit control in the utility model and links to each other with power circuit.
The utility model has the advantages that: owing on zero sequence current mutual inductor, added pair side's winding and balance current regulating circuit; increased balance to circuit three-phase leakage current; and the measurement of resultant disclosure electric current; to reduce the leakage current of input protector under normal operation, guaranteed protector can be under leakage current and situation about differing greatly thereof can bringing normally into operation.The insensitive phase degree of protector is reduced, thereby improved the performance of protector, and can reduce the power circuit investment.Adopt the leakage current indicating circuit, the resultant disclosure electric current on not only can the direct-reading circuit, the indication in the time of also can making balance adjustment is simultaneously used.The utility model also comprises ac contactor silent operation circuit; and in the prior art because time-delay arranged on guard time; wiring complexity when cooperating simultaneously; the cost height; so fail to promote the use of in vast rural area, and the utility model has been accomplished this point, and circuit element is few; wiring is easy, and can not influence the original performance of protector.Power savings is very remarkable, reach more than 92%, and vibration and noise in the sound iron core that exists in the original ac operation of A.C. contactor have been eliminated, the problem of contactor coil, iron core heating when long-time running is eliminated at all, improve the reliability of contactor, prolonged its useful life, and reduced the idle and active loss of contactor in ac operation, play tangible power savings, improved power factor (PF).As meritorious 525 kilowatt hours of can economizing on electricity in a 250A A.C. contactor year, idle 1676VAR.
The utility model is described in further detail below in conjunction with drawings and Examples:
Accompanying drawing has been described an embodiment of the present utility model.It comprises by transistor amplifier circuit, time-delay reclosing circuit, relay, and the main part formed such as zero sequence current mutual inductor, and zero sequence current mutual inductor H is getting an electric shock or leaking electricity when reaching certain numerical value, by pair side's winding L
1Induce triggering signal, offset triode BG by negative half period
1The base stage bias current ends it, triode BG
2Conducting is by triode BG
1And BG
2The Schmidt trigger of forming triggers upset, relay J adhesive, main contacts J
1Disconnect ac contactor coil, the Be Controlled down circuitry.Triode BG
2Keep conducting by capacitor C
4Pass through resistance R
9To its discharge, supply with the base stage bias current, work as capacitor C
4Discharge off, triode BG
2End, relay J discharges, and recovers former running status, carries out single shot reclosing.As also having electric leakage signal, triode BG
1, BG
2The Schmidt trigger of forming can trigger upset again, and this moment is because of capacitor C
2When overturning for the first time, pass through BG
2Constitute path, oppositely be filled with certain voltage, about 10 volts, when overturning for the second time, triode BG
3The emitter current potential is higher than base potential, triode BG
3Saturation conduction causes triode BG
2Also saturated, i.e. triode BG
3Base stage forever is electronegative potential, so circulation, and circuit interlocking as resetting, only need be pressed reset button AN, makes triode BG
3End, circuit just can recover to send electricity, and B is a power transformer, diode D
1-D
4Form bridge rectifier, R
1Be dropping resistor, C
1Be filter capacitor, D
12Be voltage stabilizing didoe, C
2Be exclusive circuit electric capacity, C
3For preventing to shake electric capacity, C
4Be time-delay reclosing tank capacitance, C
5Be coupling capacitance, C
6Be resonant capacitance, R
2Be bleeder resistance, W
1Be locking regulator potentiometer, R
5Be locking charging resistor, R
6Be output light emitting diode shunt resistance, R
7Be positive feedback resistor, R
8Be triode BG
1Load resistance, R
9Be timing circuit resistance, R
10Be triode BG
1Base electrode bias resistance, R
11Be clamp resistance, R
*Be operating current setting value step resistance, R
12Be dropping resistor, D
5, D
6, D
8Be isolating diode, D
7Be clamp diode, D
9, D
10Be limiter diode, D
11Be temperature compensated diode, D
20Be light-emitting diode.
Secondary side's winding L by zero sequence current mutual inductor H
2With resistance R
20, R
21, R
22, potentiometer W
4, W
5, W
6Form the current balance type regulating loop, another normally closed contact of relay J
2Move simultaneously with the power transmission sequence control section, make balanced balanced current send into zero sequence current mutual inductor simultaneously, guarantee to send electricity and reclosing correct operation with the line leak electric current.
By triode BG
4, BG
5And accessory circuit is formed the leakage current indicating circuit.W
3Be input signal regulator potentiometer, W
2Regulate for linear amplification, signal is through triode BG
4, BG
5Send into diode D after the amplification
14, D
15, resistance R
13, R
14The bridge rectifier of forming, direct current is sent into miliammeter after the rectification, is indicated C
8, C
10, C
11Be coupling capacitance, C
7Be filter capacitor, D
13Be voltage stabilizing didoe, C
9Be shunt capacitance, R
15Be triode BG
5Load resistance, R
19Be triode BG
4Load resistance, R
18Be coupling resistance, R
16Be negative feedback resistor, R
17Be triode BG
4Base biasing resistor.
By diode D
17, D
18, resistance R
23, R
24, capacitor C
12Form ac contactor silent operation circuit.Diode D
18And resistance R
24Form half-wave rectifying circuit, alternating voltage is a three-phase alternating current electric wire voltage, supply with coil power during as A.C. contactor starting adhesive, contact 1,2 connects A.C. contactor CJ coil, and contact 3,4 connects the normally closed contact of A.C. contactor CJ, A.C. contactor CJ coil get electric after, its normally closed contact disconnects, cut off rectification circuit input power supply, at this moment, by secondary coil and the diode D of transformer B
17The half-wave rectifying circuit of forming is supplied with A.C. contactor CJ coil power, makes A.C. contactor CJ keep adhesive with DC low-voltage, about generally about 4V, and capacitor C
12, resistance R
23, diode D
19Form anti-resonance absorbing protection loop, prevent to produce high voltage, because A.C. contactor is in the low dc voltage running status when normal operation, and electric current is very little, does not have noise, has played the effect of economize on electricity and silent running.
Claims (4)
1, a kind of multi-functional three-phase electric leakage protection device; comprise zero sequence current mutual inductor, control circuit, executive circuit, reach power circuit; it is characterized in that: zero sequence current mutual inductor has two pair side's windings; first secondary side's winding links to each other with control circuit, and second secondary side's winding links to each other with a balanced balanced current regulating circuit.
2, multi-functional three-phase electric leakage protection device according to claim 1 is characterized in that: first secondary side's winding also links to each other with a leakage current indicating circuit.
3, multi-functional three-phase electric leakage protection device according to claim 2 is characterized in that: the leakage current indicating circuit by indication amplifier, rectification circuit, and ammeter form.
4, according to claim 1 or 2,3 described multi-functional three-phase electric leakage protection devices, it is characterized in that: ac contactor silent operation circuit is subjected to executive circuit control and links to each other with power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91230537 CN2107080U (en) | 1991-11-13 | 1991-11-13 | Multi-functional three-phase leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91230537 CN2107080U (en) | 1991-11-13 | 1991-11-13 | Multi-functional three-phase leakage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2107080U true CN2107080U (en) | 1992-06-10 |
Family
ID=4935857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91230537 Granted CN2107080U (en) | 1991-11-13 | 1991-11-13 | Multi-functional three-phase leakage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2107080U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852616A (en) * | 2012-11-30 | 2014-06-11 | 海洋王（东莞）照明科技有限公司 | Voltage testing module and testing device |
| CN103926501A (en) * | 2014-04-23 | 2014-07-16 | 国家电网公司 | Pull rod type low-voltage line electric leakage fault detector |
| CN105577053A (en) * | 2016-02-01 | 2016-05-11 | 杨明 | Trigger and generator voltage regulator |
-
1991
- 1991-11-13 CN CN 91230537 patent/CN2107080U/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852616A (en) * | 2012-11-30 | 2014-06-11 | 海洋王（东莞）照明科技有限公司 | Voltage testing module and testing device |
| CN103926501A (en) * | 2014-04-23 | 2014-07-16 | 国家电网公司 | Pull rod type low-voltage line electric leakage fault detector |
| CN105577053A (en) * | 2016-02-01 | 2016-05-11 | 杨明 | Trigger and generator voltage regulator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |