CN100495846C - Arc protection and fireproof circuit for power supply cable - Google Patents
Arc protection and fireproof circuit for power supply cable Download PDFInfo
- Publication number
- CN100495846C CN100495846C CNB2004800079554A CN200480007955A CN100495846C CN 100495846 C CN100495846 C CN 100495846C CN B2004800079554 A CNB2004800079554 A CN B2004800079554A CN 200480007955 A CN200480007955 A CN 200480007955A CN 100495846 C CN100495846 C CN 100495846C
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- CN
- China
- Prior art keywords
- feed cable
- fireproof
- circuit
- arc protection
- cut
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- 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
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- 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
Technical field
The present invention relates to a kind of arc protection and fireproof circuit that is used for feed cable, particularly relate to a kind of arc protection and fireproof circuit that when producing electric arc between the metal protection layer of live wire and parcel cable, disconnects live wire in real time.
Background technology
In the art, be known for ground arc breaker protector (GFCI) circuit, it is usually used in guarding against the ground connection of live wire and/or center line.Usually, the ground connection of live wire and/or center line is breakneck, may cause very serious damage.Therefore use ground arc breaker protector circuit to detect the ground state of live wire and/or center line, thus by at least one lead between disconnecting consumers and the power supply with the state of eliminating danger.
During away from the hazard event of earth fault, also exist the dangerous situation of other type in fact, and these situations do not obtain the protection of ground arc breaker protector circuit ground arc breaker protector circuit protection majority.For example, in cable, may produce electric arc between the metal protection layer of live wire and parcel cable.Though this electric arc may not can the individual is caused direct threat, it may cause cable fire.This is a kind of very important potential threat equally for people's health and safety.
Disclosed a kind of earth fault current breaker circuit (GFCI) in U.S. Pat 4931894A, it provides additional function, can detect and protect the electric arc that produces between the metal level of live wire and covering power line or shell.It mainly adopts half to press protection to arc protection, one of them arc protection coil be positioned over connect on the iron core of GFCI differential transformer and with a resistance and metal level and zero line or return line between.By the winding number of turns and the resistance value of regulating the arc protection coil sensitivity to the arc current protection is provided with a predetermined rank.
Above-mentioned U.S. Pat 4931894A exists huge defective.Particularly, this GFCI need use differential transformer when detecting the electric arc between live wire and metal level or center line and the metal level, and this will increase the size and the expense of product significantly.
Disclosed a kind of safety circuit of cable in U.S. Pat 6738241B1, it mainly adopts the sampling protection that suspends to arc protection.On the metal protection layer of cable, be in suspended state usually, when producing electric arc between the metal protection layer of live wire and/or center line and cable,, make electric arc directly trigger silicon controlled rectifier protecting by special controllable silicon connection.Its earth leakage protective device is very common, and its arc current value is determined according to current-limiting resistance.
Owing to adopted controllable silicon, it can not accurately be regulated the arc current value among the above-mentioned U.S. Pat 6738241B1.
Summary of the invention
The objective of the invention is to: provide a kind of providing can between live wire and/or center line and metal protection layer, electric arc take place the time to detect and protection and can accurately adjust the arc protection and the fireproof circuit of arc current value.
The object of the present invention is achieved like this: a kind of arc protection and fireproof circuit that is used for feed cable, comprise test section, sampling section, power pack, circuit breaker part, it is characterized in that: the arc protection of feed cable and fireproof circuit are serially connected with in the feed cable between power supply and the load, the condition controlled cut-out relay (J) in arc protection and fireproof circuit of the on/off of feed cable between power supply and the load; Circuit breaker partly comprises cut-out relay (J), amplifier, resistance (R4), control coil (L) in the output of amplifier and the cut-out relay (J) is connected, and the live wire of feed cable is connected with each self-corresponding normally-closed contact in the cut-out relay (J) respectively with center line; The test section comprises two divider resistances that are connected in series (R2, R3), one end of divider resistance (R2, R3) is connected on the metal protection layer of feed cable of load end, other end ground connection or center line, the dividing point between two divider resistances (R2, R3) is connected with the sampling rectifying part; Described sampling rectifying part comprises rectification circuit and filter capacitor (C1), and the input of rectification circuit is connected with dividing point between the divider resistance (R2, R3), and the signal behind the rectifying and wave-filtering is through resistance (R4) input amplifier; Power pack comprises voltage stabilizing didoe (DZ1), storage capacitor (C2) and rectification unit, the input of rectification unit is connected with power supply, and the direct current that obtains after the rectification provides operating voltage for control coil (L) and amplifier in the cut-out relay (J) after voltage stabilizing didoe (DZ1) and storage capacitor (C2) voltage stabilizing.
The invention has the advantages that: circuit is simple, and circuit adopts the sampling protection that suspends, and when producing electric arc between the metal protection layer of live wire and/or center line and parcel cable, cuts off the electricity supply rapidly, has prevented the generation of fire effectively.Because the transistor that adopts has amplification, adjusts the resistance ratio of R2 and R3 in process of production and promptly can accurately make adjustment to the arc current value.
Description of drawings
Fig. 1 is an embodiment who embodies arc protection of the present invention and fireproof circuit;
Fig. 2 is another embodiment that embodies arc protection of the present invention and fireproof circuit;
Fig. 3 is another embodiment that embodies arc protection of the present invention and fireproof circuit.
Among the figure: 1, live wire, 2, center line, 3, ground wire, 4, metal protection layer.
Embodiment
Nonrestrictive two specific embodiments that the present invention relates to that disclose of accompanying drawing, the invention will be further described below in conjunction with embodiment.
As shown in Figure 1, the present invention includes test section, sampling rectifying part, power pack, circuit breaker part, feed cable comprises the live wire 1 and the center line 2 of metal protection layer 4 and metal protection layer 4 parcels, the arc protection of feed cable and fireproof circuit are serially connected with in the feed cable between power supply and the load, the condition controlled cut-out relay J in arc protection and fireproof circuit of the on/off of feed cable between power supply and the load; Circuit breaker partly comprises cut-out relay J, amplifier, resistance R 4, and the control coil L in the output of amplifier and the cut-out relay J is connected, and the live wire of two ends introducing is connected with each self-corresponding normally-closed contact among the cut-out relay J respectively with center line; The test section comprises two the divider resistance R2 and the R3 that are connected in series, and an end of series arm is connected on the metal protection layer of feed cable of load end, other end ground connection or center line, and the dividing point between two divider resistance R2 and the R3 is connected with the sampling rectifying part; The sampling rectifying part comprises rectification circuit and filter capacitor C1, and the input of rectification circuit is connected with dividing point between divider resistance R2 and the R3, and the signal behind the rectifying and wave-filtering is through resistance R 4 input amplifiers; Power pack comprises voltage stabilizing didoe DZ1, storage capacitor C2 and rectification unit, and the input of rectification unit is connected with power supply, and the direct current of output provides operating voltage for cut-out relay J and amplifier after voltage stabilizing didoe DZ1 and storage capacitor C2 voltage stabilizing.In the present embodiment, described amplifier is triode BG1, and the signal behind the rectifying and wave-filtering is through resistance R 4 input triode BG1, and the interior control coil L of the collector electrode of triode BG1 and cut-out relay J is connected grounded emitter or center line; Described cut-out relay is provided with reset switch K1; Described test section also comprises the debugging branch road that Test Switchboard K2 and dropping resistor R1 form, and an end of debugging branch road is connected with live wire 1, and the other end is connected on the metal protection layer 4 of feed cable of load end; Rectification circuit in the described sampling rectifying part comprises rectifier diode D1; Circuit breaker part also comprise with cut-out relay J in the diode D2 that is arranged in parallel of control coil L, the anode of diode D2 is connected with the electrode input end of control coil L working power; Rectification unit in the described power pack is made up of diode D3 and R5, and the direct current of output is through voltage stabilizing didoe DZ1 and the storage capacitor C2 ground connection or the center line of parallel connection.During concrete enforcement, the rectification circuit in the sampling rectifying part also can adopt the bridge heap.
As seen from Figure 2, the difference of present embodiment and the described embodiment of Fig. 1 only is: the rectification unit in the described power pack is by transformer B1 and four rectifier bridges that diode D3-D6 forms, diode D3 and R5 among the described embodiment of Fig. 1 have been substituted, the output of rectifier bridge is in parallel with voltage stabilizing didoe DZ1 and storage capacitor C2, and present embodiment generally can be used in the occasion that supply voltage is 110V.
As seen from Figure 3, present embodiment only is with the difference of the described embodiment of Fig. 2: the transformer B1 of the rectification unit in the described power pack elementary has been connected in series a capacitor C 3, supply voltage higher (when supply voltage be 220V and more than) occasion, dividing potential drop by capacitor C 3, can obviously reduce the volume of transformer B1, reduce cost.
In the use, because the live wire of feed cable and center line are connected among the cut-out relay J on each self-corresponding normally-closed contact between power supply and the load, power supply and load are unimpeded.When making between live wire 1 or center line 2 and the metal protection layer 4 because of certain reason, feed cable produces electric arc; arc current forms on divider resistance R2 and R3 and divides piezoelectric signal; branch piezoelectric signal after rectification is by base resistance R4 input amplifier; the output signal of amplifier increases the direct current that is added on the cut-out relay J inner control coil L; the normally-closed contact of cut-out relay J is disconnected and is clamped; cut off the electricity supply and load between feed cable, reach arc protection and fireproof purpose.After fault is eliminated, as long as press reset switch K1, remove the clamped normally-closed contact contact that makes, recover the power supply of power supply again to load.In order to detect the arc protection that is used for feed cable and the reliability of fireproof circuit; can be regular in the use or irregular by Test Switchboard K2 simulation live wire and the electric arc that metal protection layer 4 produces, verify be used for the arc protection of feed cable and can fireproof circuit in time cut off the electricity supply and load between feed cable.
Claims (8)
1, a kind of arc protection and fireproof circuit that is used for feed cable comprises test section, sampling section, power pack, circuit breaker part, it is characterized in that:
A) arc protection of feed cable and fireproof circuit are serially connected with in the feed cable between power supply and the load, the condition controlled cut-out relay (J) in arc protection and fireproof circuit of the on/off of feed cable between power supply and the load;
B) circuit breaker partly comprises cut-out relay (J), amplifier, the 4th resistance (R4), the 4th resistance (R4) places amplifier input terminal, control coil (L) in the output of amplifier and the cut-out relay (J) is connected, and the live wire of feed cable is connected with the normally-closed contact of cut-out relay (J) respectively with center line;
C) test section comprises two divider resistances that are connected in series (R2, R3), one end of divider resistance (R2, R3) is connected on the metal protection layer of feed cable of load end, other end ground connection or center line, the dividing point between two divider resistances (R2, R3) is connected with the sampling rectifying part;
D) described sampling rectifying part comprises rectification circuit and filter capacitor (C1), and the input of rectification circuit is connected with dividing point between the divider resistance (R2, R3), and the signal behind the rectifying and wave-filtering is through resistance (R4) input amplifier;
E) power pack comprises voltage stabilizing didoe (DZ1), storage capacitor (C2) and rectification unit, the input of rectification unit is connected with power supply, and the direct current that obtains after the rectification provides operating voltage for the control coil (L) and the amplifier of cut-out relay (J) after voltage stabilizing didoe (DZ1) and storage capacitor (C2) voltage stabilizing.
2 arc protection and the fireproof circuits that are used for feed cable according to claim 1; it is characterized in that: described amplifier is triode (BG1); signal behind the rectifying and wave-filtering is through the base stage of the 4th resistance (R4) input triode (BG1); control coil (L) in the collector electrode of triode (BG1) and the cut-out relay (J) is connected grounded emitter or center line.
3, arc protection and the fireproof circuit that is used for feed cable according to claim 1, it is characterized in that: described cut-out relay is provided with reset switch (K1); Described test section also comprises the series connection debugging branch road that Test Switchboard (K2) and dropping resistor (R1) are formed, and an end of debugging branch road is connected with live wire, and the other end is connected on the metal protection layer of feed cable of load end.
4, according to claim 1 or 2 or 3 described arc protection and the fireproof circuits that are used for feed cable, it is characterized in that: the rectification circuit in the described sampling rectifying part is first diode (D1) or bridge heap.
5, according to claim 1 or 2 or 3 described arc protection and the fireproof circuits that are used for feed cable; it is characterized in that: the rectification unit in the described power pack is made up of the 3rd diode (D3) and the 5th resistance (R5), and the direct current of output is through the voltage stabilizing didoe (DZ1) and storage capacitor (C2) ground connection of parallel connection or connect center line.
6, according to claim 1 or 2 or 3 described arc protection and the fireproof circuits that are used for feed cable; it is characterized in that: the rectification unit in the described power pack comprises transformer (B1) and the bridge rectifier of being made up of the 3rd to the 6th diode (D3-D6), and the output of bridge rectifier is in parallel with voltage stabilizing didoe (DZ1) and storage capacitor (C2).
7, according to claim 1 or 2 or 3 described arc protection and the fireproof circuits that are used for feed cable; it is characterized in that: second diode (D2) that the control coil (L) that the circuit breaker part also comprises and cut-out relay (J) is interior is arranged in parallel, the anode of second diode (D2) is connected with the electrode input end of control coil (L) working power.
8, arc protection and the fireproof circuit that is used for feed cable according to claim 6 is characterized in that: the transformer in the rectification unit (B1) primary side serial connection 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 CN1868103A (en) | 2006-11-22 |
| CN100495846C true 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105914846A (en) * | 2016-06-30 | 2016-08-31 | 洛阳嘉盛新能源科技有限公司 | Arcing and high temperature prevention device |
Families Citing this family (3)
| 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5757598A (en) * | 1996-12-27 | 1998-05-26 | Tower Manufacturing Corporation | Ground fault 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 |
| US6262161B1 (en) * | 1997-06-26 | 2001-07-17 | The Dow Chemical Company | Compositions having improved ignition resistance |
| 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 |
| US6639769B2 (en) * | 1997-12-19 | 2003-10-28 | Leviton Manufacturing Co., Inc. | Arc fault detector with circuit interrupter |
Family Cites Families (1)
| 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 |
-
2004
- 2004-10-12 CN CNB2004800079554A patent/CN100495846C/en not_active Expired - Fee Related
- 2004-10-12 WO PCT/CN2004/001159 patent/WO2006039836A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US6639769B2 (en) * | 1997-12-19 | 2003-10-28 | 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105914846A (en) * | 2016-06-30 | 2016-08-31 | 洛阳嘉盛新能源科技有限公司 | Arcing and high temperature prevention device |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1868103A (en) | 2006-11-22 |
| WO2006039836A1 (en) | 2006-04-20 |
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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 |