CN1868103A - Arc protective and fireproof circuit for power supply cable - Google Patents
Arc protective and fireproof circuit for power supply cable Download PDFInfo
- Publication number
- CN1868103A CN1868103A CNA2004800079554A CN200480007955A CN1868103A CN 1868103 A CN1868103 A CN 1868103A CN A2004800079554 A CNA2004800079554 A CN A2004800079554A CN 200480007955 A CN200480007955 A CN 200480007955A CN 1868103 A CN1868103 A CN 1868103A
- Authority
- CN
- China
- Prior art keywords
- circuit
- feed cable
- fireproof
- cut
- arc protection
- 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.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
- H02H1/0015—Using arc detectors
Abstract
An arc protective and fireproof circuit for electric power cable includes a detecting section, a sampling section, a power supplying section, and a breaking secion. The arc protective and fireproof circuit for electric power cable is connected in series with the power cable between the source and the load. Divider resistors R2 and R3 connected in series are provided between the conductive coating of the electric power cable and the ground/neutral line. The electric signal generated on the voltage dividing point between the divider resistor R2 and R3 is rectified and filtered. Then the electric signal is sent to an amplifier and controls a breaking relay J. The on/off state of the electric power cable between the source And the load is controlled by the breaking relay J.
Description
Arc protection and fireproof circuit for feed cable
Technical field
The present invention relates to a kind of arc protection and fireproof circuit for feed cable, more particularly to a kind of arc protection and fireproof circuit for disconnecting live wire in real time when producing electric arc between the metal protection layer of live wire and parcel cable.
Background technology
In the art, for ground arc breaker protector（GFCI) circuit is known, and it is usually used in guarding against the ground connection of live wire and/or center line.Generally, the ground connection of live wire and/or center line is breakneck, may result in very serious damage.Therefore the ground state of live wire and/or center line is detected using ground arc breaker protector circuit, so that by least one wire between disconnecting consumers and power supply with the state of eliminating danger.
In hazard event of the ground arc breaker protector circuit protection majority away from earth fault, other types of dangerous situation is also there is in fact, and these situations do not obtain the protection of ground arc breaker protector circuit.For example, in the cable, electric arc may be produced between live wire and the metal protection layer for wrapping up cable.Although this electric arc may not cause direct threat to individual, it may result in cable fire.This is equally a kind of very important potential threat for the health and safety of people.
A kind of earth-fault current breaker circuit (GFCI) is disclosed in United States Patent (USP) US4931894A, it provides additional function, can detect and protect the electric arc produced between live wire and the metal level or shell that cover power line.It is mainly protected to arc protection using half pressure, and one of arc protection coil is positioned on the iron core of GFCI differential transformers and with one between resistant series and metal level and zero line or return line.By adjusting the winding number of turns and resistance value of arc protection coil by the sensitivity protected to arc current, one predetermined rank is set.
Above-mentioned United States Patent (USP) US4931894A has huge defect.Particularly, the GFCI needs to use differential transformer to detect during the electric arc between live wire and metal level or center line and metal level, and this will significantly increase the size and expense of product.
A kind of safety circuit of cable is disclosed in United States Patent (USP) US6738241B1, it is to arc protection mainly using the sampling protection that suspends.On the metal protection layer of cable, usually in suspended state, when producing electric arc between the metal protection layer of live wire and/or center line and cable, by special controllable silicon connection, electric arc is set directly to trigger silicon controlled rectifier protecting.Its earth leakage protective device is very common, and its arc current value is determined according to current-limiting resistance.
As a result of controllable silicon in above-mentioned United States Patent (USP) US6738241B1, it can not carry out accurate adjustment to arc current value.
The content of the invention
It is an object of the invention to：There is provided and a kind of detection is provided when electric arc can occur between live wire and/or center line and metal protection layer and protects and can accurately adjust the arc protection and fireproof circuit of arc current value.
The object of the present invention is achieved like this：A kind of arc protection and fireproof circuit for feed cable, including detection part, sampling section, power pack, circuit breaker part, it is characterised in that：The arc protection and fireproof circuit of feed cable are serially connected with the feed cable between power supply and load, and the on/off state of feed cable is controlled by the cut-out relay J in arc protection and fireproof circuit between power supply and load;Circuit breaker part includes cut-out relay J, amplifier, resistance R4, and the output end of amplifier is connected with the control coil L in cut-out relay J, and live wire and center line are connected with each self-corresponding normally-closed contact in cut-out relay J respectively；Detection part includes two the divider resistance R2 and R3 being connected in series, one end of series arm is connected on the metal protection layer of the feed cable of load end, the other end is grounded or center line, and the dividing point between two divider resistances R2 and R3 is connected with sampling rectifying part；Sampling section includes rectification circuit and filter capacitor C1, the dividing point connection between the input and divider resistance R2 and R3 of rectification circuit, and the signal after rectifying and wave-filtering is through resistance R4 input amplifiers；Power pack includes voltage-regulator diode DZ1, storage capacitor C2 and rectification unit, and the input of rectification unit is connected with power supply, and the direct current of output is that cut-out relay and amplifier provide operating voltage after voltage-regulator diode DZ1 and storage capacitor C2 voltage stabilizings.
The advantage of the invention is that：Circuit is simple, circuit using the sampling protection that suspends, when live wire and/
Or cut off the electricity supply rapidly during generation electric arc between the metal protection layer of center line and parcel cable, effectively prevent the generation of fire.Because the transistor of use has amplification, adjust in process of production
R2 and R3 resistance ratio is accurately arc current value to be made adjustment.
Brief description of the drawings
Fig. 1 is the one embodiment for embodying the arc protection and fireproof circuit of the present invention；
Fig. 2 is another embodiment for embodying the arc protection and fireproof circuit of the present invention；
Fig. 3 is another embodiment for embodying the arc protection and fireproof circuit of the present invention.
In figure：1st, live wire, 2, center line, 3, ground wire, 4, metal protection layer.
Embodiment
Accompanying drawing is nonrestrictive to disclose two specific embodiments of the present invention, and with reference to embodiment, the invention will be further described.
As shown in Fig. 1; the present invention includes detection part, sampling rectifying part, power pack, circuit breaker part; feed cable includes the live wire 1 and center line 2 that metal protection layer 4 and metal protection layer 4 are wrapped up; the arc protection and fireproof circuit of feed cable are serially connected with the feed cable between power supply and load, and the on/off state of feed cable is controlled by the cut-out relay J in arc protection and fireproof circuit between power supply and load;Circuit breaker part include cut-out relay J, amplifier, resistance ' R4, the output end of amplifier is connected with the control coil L in cut-out relay J, and the live wire and center line that two ends are introduced into are connected with each self-corresponding normally-closed contact in cut-out relay J respectively；Detection part includes two the divider resistance R2 and R3 being connected in series, one end of series arm is connected on the metal protection layer of the feed cable of load end, the other end is grounded or center line, and the dividing point between two divider resistances R2 and R3 is connected with sampling rectifying part；Rectifying part of sampling includes rectification circuit and filter capacitor Cl, the dividing point connection between the input and divider resistance R2 and R3 of rectification circuit, and the signal after rectifying and wave-filtering is through resistance R4 input amplifiers；Power pack includes voltage-regulator diode DZ1, storage capacitor C2 and rectification unit, the input of rectification unit is connected with power supply, and the direct current of output is that cut-out relay J and amplifier provide operating voltage after voltage-regulator diode DZ1 and storage capacitor C2 voltage stabilizings.In the present embodiment, described amplifier is that signal after triode BG1, rectifying and wave-filtering inputs three poles through resistance R4
Pipe BG1, triode BG1 colelctor electrode are connected with the control coil L in cut-out relay J, grounded emitter or center line；Described cut-out relay is provided with reset switch IU;Described detection part also includes the debugging branch road of test switch K2 and dropping resistor R1 compositions, and one end of debugging branch road is connected with live wire 1, another to be terminated on the metal protection layer 4 of the feed cable of load end；Rectification circuit in described sampling rectifying part includes commutation diode D1;Circuit breaker part also includes the diode D2 being arranged in parallel with the control coil in cut-out relay J;Rectification unit in described power pack is made up of diode D3 and R5, and the direct current of output is through voltage-regulator diode DZ1 and storage capacitor C2 ground connection in parallel or center line.When it is implemented, the rectification circuit in sampling rectifying part can also use bridge heap.
From Figure 2 it can be seen that the present embodiment and embodiment described in Fig. 1 are differed only in：The rectifier bridge that rectification unit in described power pack is made up of transformer B1 and four diode D3-D6, it instead of diode D 3 and the R5 in embodiment described in Fig. 1, the output end of rectifier bridge is in parallel with voltage-regulator diode DZ1 and storage capacitor C2, and the present embodiment can typically be used in the occasion that supply voltage is 110V.
As seen from Figure 3, the present embodiment and embodiment described in Fig. 2 are differed only in：The transformer B1 of rectification unit in described power pack primary has concatenated an electric capacity C3, higher in supply voltage（When supply voltage be 220V and its more than）Occasion, by electric capacity C3 partial pressure, transformer B1 volume can be obviously reduced, cost is reduced.
In use, because the live wire and center line of feed cable between power supply and load are connected in cut-out relay J on each self-corresponding normally-closed contact, power supply is unimpeded with load.When feed cable because certain reason makes to produce electric arc between live wire 1 or center line 2 and metal protection layer 4, arc current forms partial pressure electric signal on divider resistance R2 and R3, partial pressure electric signal after rectified is by base resistance R4 input amplifiers, and the output signal of amplifier makes to be added in cut-out relay；DC current increase in T on control coil L, cut-out relay J normally-closed contact is disconnected and clamped, and feed cable between cutting off the electricity supply and loading reaches arc protection and fireproof purpose.After Failure elimination, as long as pressing reset switch K1, releasing is clamped to contact normally-closed contact, recovers power supply of the power supply to load again.In order to detect the reliability of arc protection and fireproof circuit for feed cable; can be periodically or non-periodically in use simulate the electric arc that live wire and metal protection layer 4 are produced by testing switch K2, verify arc protection and fireproof circuit for feed cable can cut off the electricity supply and load in time between feed cable.
Claims (1)
- Wooden fork profit is required1st, a kind of arc protection and fireproof circuit for feed cable, including detection part, sampling section, power pack, circuit breaker part, it is characterised in that：A) arc protection and fireproof circuit of feed cable are serially connected with the feed cable between power supply and load, and the on/off state of feed cable is controlled by the cut-out relay J in arc protection and fireproof circuit between power supply and load;B) circuit breaker part includes cut-out relay J, amplifier, resistance R4, and the output end of amplifier is connected with the control coil L in cut-out relay J, and live wire and center line are connected with each self-corresponding normally-closed contact in cut-out relay respectively；C) detection part includes two the divider resistance R2 and R3 being connected in series, one end of series arm is connected on the metal protection layer of the feed cable of load end, the other end is grounded or center line, and the dividing point between two divider resistances R2 and R3 is connected with sampling rectifying part；D) sampling section includes rectification circuit and filter capacitor C1, the dividing point connection between the input and divider resistance R2 and R3 of rectification circuit, and the signal after rectifying and wave-filtering is through resistance R4 input amplifiers；E) power pack includes voltage-regulator diode DZ1, storage capacitor C2 and rectification unit, the input of rectification unit is connected with power supply, and the direct current of output is that cut-out relay and amplifier provide operating voltage after voltage-regulator diode DZ1 and storage capacitor C2 voltage stabilizings.2 arc protection and fireproof circuit for feed cable according to wooden fork profit requires 1, it is characterised in that：Described amplifier is that the signal after triode BG1, rectifying and wave-filtering inputs triode BG1, triode BG1 colelctor electrode and cut-out relay through resistance R4；Control coil L connections in Γ, grounded emitter or center line.3rd, the arc protection and fireproof circuit according to claim 1 for feed cable, its It is characterised by：Described cut-out relay is provided with reset switch K1;Described detection part also includes the debugging branch road of test switch K2 and dropping resistor R1 compositions, and one end of debugging branch road is connected with live wire, another to be terminated on the metal protection layer of the feed cable of load end.4th, the arc protection and fireproof circuit for feed cable according to claim 1 or 2 or 3, it is characterised in that：Rectification circuit in described sampling rectifying part includes commutation diode D1 or bridge heap.5th, the arc protection and fireproof circuit for feed cable according to claim 1 or 2 or 3, it is characterised in that：Rectification unit in described power pack is made up of diode D1 and R5, the direct current of output by voltage-regulator diode DZ1 it is in parallel with storage capacitor C2 after be grounded or connect center line.6th, the arc protection and fireproof circuit for feed cable according to claim 1 or 2 or 3, it is characterised in that：The rectifier bridge that rectification unit in described power pack is made up of transformer B1 and four diode D3-D6, the output end of rectifier bridge is in parallel with voltage-regulator diode DZ1 and storage capacitor C2.7th, the arc protection and fireproof circuit for feed cable according to claim 1 or 2 or 3, it is characterised in that：Circuit breaker part also includes and cut-out relay：[the diode 02 that interior control coil is arranged in parallel.8th, the arc protection and fireproof circuit for feed cable according to wooden fork profit requires 6, it is characterised in that：Transformer B1 primary sides in rectification unit concatenate an electric capacity C3.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2004/001159 WO2006039836A1 (en) | 2004-10-12 | 2004-10-12 | Arc protective and fireproof circuit for electicr power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1868103A true CN1868103A (en) | 2006-11-22 |
| CN100495846C CN100495846C (en) | 2009-06-03 |
Family
ID=36148032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800079554A Expired - Fee Related CN100495846C (en) | 2004-10-12 | 2004-10-12 | Arc protection and fireproof circuit for power supply cable |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100495846C (en) |
| WO (1) | WO2006039836A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102307296A (en) * | 2011-09-06 | 2012-01-04 | 天津汇讯视通科技有限公司 | Dome camera power voltage monitoring circuit and method thereof |
| CN102708649A (en) * | 2012-06-12 | 2012-10-03 | 严俊辉 | Multifunctional electrical safety detector |
| CN103035096B (en) * | 2012-12-10 | 2015-04-22 | 北京博顿电气有限公司 | Extensible multi-loop surplus current-mode electrical fire monitor extension set |
| CN105914846B (en) * | 2016-06-30 | 2018-05-29 | 洛阳嘉盛新能源科技有限公司 | A kind of anti-arcing and the protective device of high temperature |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5477412A (en) * | 1993-07-08 | 1995-12-19 | Leviton Manufacturing Co., Inc. | Ground fault circuit interrupter incorporating miswiring prevention circuitry |
| US5757598A (en) * | 1996-12-27 | 1998-05-26 | Tower Manufacturing Corporation | Ground fault circuit interrupter |
| US6262161B1 (en) * | 1997-06-26 | 2001-07-17 | The Dow Chemical Company | Compositions having improved ignition resistance |
| US6088205A (en) * | 1997-12-19 | 2000-07-11 | Leviton Manufacturing Co., Inc. | Arc fault detector with circuit interrupter |
| US5933305A (en) * | 1998-06-02 | 1999-08-03 | Eaton Corporation | Arc fault detector comparing integrated interval to interval filtered load current and circuit breaker incorporating same |
| US6198611B1 (en) * | 1998-12-15 | 2001-03-06 | Pass & Seymour, Inc. | Arc fault circuit interrupter without DC supply |
| CN2527010Y (en) * | 2002-01-16 | 2002-12-18 | 西安科技学院 | Safety isolation arc suppression and protection apparatus for power supply in mine |
-
2004
- 2004-10-12 WO PCT/CN2004/001159 patent/WO2006039836A1/en active Application Filing
- 2004-10-12 CN CNB2004800079554A patent/CN100495846C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006039836A1 (en) | 2006-04-20 |
| CN100495846C (en) | 2009-06-03 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090603 Termination date: 20091112 |