CN2521806Y - Zero line voltage-offset automatic breaker - Google Patents

Zero line voltage-offset automatic breaker Download PDF

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Publication number
CN2521806Y
CN2521806Y CN 01248583 CN01248583U CN2521806Y CN 2521806 Y CN2521806 Y CN 2521806Y CN 01248583 CN01248583 CN 01248583 CN 01248583 U CN01248583 U CN 01248583U CN 2521806 Y CN2521806 Y CN 2521806Y
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CN
China
Prior art keywords
wire
circuit
zero line
neutral wire
voltage
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Expired - Lifetime
Application number
CN 01248583
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Chinese (zh)
Inventor
琚永安
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琚永安
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Publication date
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Priority to CN 01248583 priority Critical patent/CN2521806Y/en
Application granted granted Critical
Publication of CN2521806Y publication Critical patent/CN2521806Y/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model provides an automatic neutral wire voltage deviation breaker in a low-voltage, three-phase and four-wire power distribution system to avoid accidents caused by disconnection of a neutral wire. A detecting and sampling circuit (2), which is connected with a neutral wire detecting point (1), is arranged between three-phase power supply lines (L <1> to L <3> ) and a neutral wire. The sampling voltage output from the detecting and sampling circuit (2) is connected to a comparative drive circuit (3) to be compared with a working ground wire (5). Moreover, the output of the comparative drive circuit (3) is connected wit an electromagnetic trip (4). The breaker can effectively prevent harms to the three-phase and four-wire (or five-wire) power supply system, which are caused by abnormal rising of the neutral wire voltage due to disconnection of the neutral wire and other reasons. The utility model is provided with the advantages of the simple structure, the reliable performance, the low price, the strong exchangeability, the economy and practicability, convenience for spreading, and so on.

Description

Zero line variation automatic circuit breaker
Technical field: the utility model relates to a kind of control device that opens circuit, the control device that opens circuit that the variation that relates to produce for neutral line break in a kind of low pressure three-phase four-wire system (380/220V) distribution system is specifically protected.
Background technology: in the low-voltage power system of China especially industry and folk power supply system, employing be the three-phase four-wire system distribution system.Owing to reasons such as mechanical force or artificial wrongs, the neutral line break phenomenon takes place often.Will be under the three-phase imbalance load effect behind the neutral line break, making breakpoint is that voltage raises with the neutral point current potential generation skew of lower part.The voltage that bears of threephase load this moment loses symmetry, and the voltage that single-phase load bears changes in a big way in, thereby causes single-phase type three-phase power consumption equipment or apparatus damage (ruining) bad, and the accident of power supply of initiation thus.Not only directly influence system's power supply, bring harmful effect, and all therefore cause the tremendous economic loss every year and cause dispute to society.And domestic existing circuit breaker has only short circuit, overload or earth leakage protective, and is but uncontrollable at all to neutral line break.
Summary of the invention: the purpose of this utility model is to provide a kind of zero line variation automatic circuit breaker.It is in order to solve when the neutral point current potential that causes behind the distribution system neutral line break raises, still to avoid system's accident of power supply, protect electric equipment, reduce economic loss, avoiding causing the problem of dispute.
The purpose of this utility model is achieved in that this utility model comprises automatic circuit breaker, detects sample circuit, comparison drive circuit, and it is at low-voltage distribution system three-phase power line L 1-L 3And between the zero line, the detection sample circuit that is connected with zero line is set, insert relatively that drive circuit compares with special-purpose working grounding cable to the sampling voltage that detects sample circuit output, and directly link to each other by drive circuit output relatively and to fetch the separating brake of controlling automatic circuit breaker with the magnetictrip of automatic circuit breaker.
This utility model is that reference voltage compares control with tested zero line voltage with it with special-purpose working grounding cable especially owing to taked above structure, make product structure simply, dependable performance, cheap, economical and practical.Can not only reliably realize goal of the invention, and can organically combine that interchangeability is strong with all kinds of low pressure automatic circuit breakers of routine.The renewal product that this utility model will become in the common low pressure TN system is widely used.
Description of drawings:
Fig. 1 is the key wiring diagram of zero line variation automatic circuit breaker;
Fig. 2 is the concrete enforcement winding diagram of zero line variation automatic circuit breaker.
Embodiment: zero line variation automatic circuit breaker is a kind of novel breaker of inventing on existing automatic circuit breaker basis.It comprises short circuit, overload, earth leakage protective, shown in frame of broken lines among Fig. 1.It is zero line test point 1 to be inserted detect sample circuit 2, again the sampling voltage that detects sample circuit 2 acquisitions is inserted relatively drive circuit 3, with special-purpose working grounding cable 5 as reference point (0 current potential just, this point separates with tested zero line strictness and keeps predetermined distance) insert relatively more moving circuit 3, again by relatively the output of drive circuit 3 and the magnetictrip 4 of automatic circuit breaker are formed by connecting.Be known technology in each square frame among Fig. 1.What Fig. 2 provided is the object lesson of Fig. 1.It is to establish by resistance R between special-purpose working grounding cable 5 at zero line test point 1 2In parallel with capacitor C again with resistance R 1The detection sample circuit 2 that dividing potential drop is formed is got in series connection, resistance R 1, R 2Series connection node insert the comparison drive circuit 3 that the triggering control utmost point of controllable silicon SCR promptly is made up of controllable silicon SCR, the negative electrode of controllable silicon SCR connects special-purpose working grounding cable 5, controls between the utmost point in the triggering of special-purpose working grounding cable 5 and controllable silicon SCR to be provided with and resistance R 2And the protection diode D of capacitor C parallel connection 1, in addition at the magnetictrip 4 and absorption diode D of controllable silicon SCR anode setting by automatic circuit breaker 5Parallel connection is then through diode D 2-D 4The gate circuit of forming respectively with three-phase power line L 1-L 3Just three phase mains is connected.When neutral line break, just produce offset voltage at zero line test point 1, through resistance R 1, R 2Send into the triggering control utmost point of controllable silicon SCR after the dividing potential drop sampling, because gate circuit is connected to the circuit breaker end opening, form electric power loop, so when sampling voltage is that triggering signal voltage is during greater than the controllable silicon SCR conduction value, the SCR conducting, 4 energisings of circuit breaker electric magnetic release, the tripping mechanism would trip, thus avoid accident to take place.Diode D among Fig. 2 1Be the protection diode that is provided with for controllable silicon SCR, diode D 5Be to be provided with in order to the back-emf that absorbs magnetictrip 4.This utility model circuit structure is simple, and control is reliable, and is economical and practical, is suitable for promoting.

Claims (1)

1, a kind of zero line variation automatic circuit breaker comprises automatic circuit breaker, detects relatively drive circuit (3) of sample circuit (2), it is characterized in that at three-phase power line (L 1-L 3) with zero line between be provided with the detection sample circuit (2) that is connected with zero line test point (1), insert relatively detecting sample circuit (2) output that drive circuit (3) compares this sampling voltage with special-purpose working grounding cable (5), and will compare drive circuit (3) output directly and the magnetictrip (4) of automatic circuit breaker be connected to form.
CN 01248583 2001-07-05 2001-07-05 Zero line voltage-offset automatic breaker Expired - Lifetime CN2521806Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 01248583 CN2521806Y (en) 2001-07-05 2001-07-05 Zero line voltage-offset automatic breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 01248583 CN2521806Y (en) 2001-07-05 2001-07-05 Zero line voltage-offset automatic breaker

Publications (1)

Publication Number Publication Date
CN2521806Y true CN2521806Y (en) 2002-11-20

Family

ID=33659184

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 01248583 Expired - Lifetime CN2521806Y (en) 2001-07-05 2001-07-05 Zero line voltage-offset automatic breaker

Country Status (1)

Country Link
CN (1) CN2521806Y (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100357749C (en) * 2005-10-08 2007-12-26 华北电力大学(北京) Zero-line and breakage detector of three-phase and four-line system
CN102157915A (en) * 2011-04-11 2011-08-17 河南省电力公司驻马店供电公司 Zero line break protection device
CN112653109A (en) * 2020-12-23 2021-04-13 海南电网有限责任公司保亭供电局 Automatic low-voltage zero line fault isolation device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100357749C (en) * 2005-10-08 2007-12-26 华北电力大学(北京) Zero-line and breakage detector of three-phase and four-line system
CN102157915A (en) * 2011-04-11 2011-08-17 河南省电力公司驻马店供电公司 Zero line break protection device
CN112653109A (en) * 2020-12-23 2021-04-13 海南电网有限责任公司保亭供电局 Automatic low-voltage zero line fault isolation device

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Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CX01 Expiry of patent term

Expiration termination date: 20110705

Granted publication date: 20021120