CN2831570Y - Arc protector of power cable - Google Patents
Arc protector of power cable Download PDFInfo
- Publication number
- CN2831570Y CN2831570Y CN 200520071869 CN200520071869U CN2831570Y CN 2831570 Y CN2831570 Y CN 2831570Y CN 200520071869 CN200520071869 CN 200520071869 CN 200520071869 U CN200520071869 U CN 200520071869U CN 2831570 Y CN2831570 Y CN 2831570Y
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Abstract
The utility model relates to an arc protector for power cables, which is used for the arc protection of the power cables that are connected between a power supply source and a load, and mainly composed of an arc detection part and a power broken circuit part, wherein the arc detection part comprises a current transformer primary coil, an arc detection conductors and resistors (R1, R2), and the power broken circuit part comprises a current transformer secondary coil, a circuit break driving device and double-break switches (K1, K2). Additionally, a circuit testing part, a voltage protection circuit and an indication circuit can be arranged so as to effectively protect, in real time, arc which is produced between a cable fire line and a metal protective sheath or between a cable median line and the metal protective sheath. The utility model can accurately adjust the sensitivity of arc response, can carry out effective protection of the arc of the cable fire line and/or the cable median line, and has the advantages of simple structure, small size, low cost, reliable operation, high sensitivity, wide application ranges, etc.
Description
Technical field
The utility model relates to a kind of arc protection device that is used for feed cable; particularly relate to a kind of when live wire or/and disconnect the live wire that cable is connected with power supply and the arc protection device of center line when producing electric arc between the metal protection of center line and the parcel cable cover in real time, belong to the distribution field.
Background technology
In the distribution field, be known for ground fault open circuit protector (GFCI) circuit, it is usually used in guarding against the ground connection of live wire.Usually, live wire ground connection is breakneck, may cause very serious damage.As artificial careless electric shock, thereby connect live wire and the earth and shocked by electricity.In the existing ground fault open circuit protective circuit current transformer is arranged, live wire and center line pass current transformer simultaneously, form two primary coils that magnetic field is opposite, and a primary coil is serially connected on the live wire, and another is serially connected on the center line.When earth fault appears in the load end of GFCI, the electric current that returns from center line just is not equal to the electric current that flows out from live wire, it is Leaked Current of Line to Ground, just produce the magnetic flux flow that can not be cancelled out each other on the zero sequence current mutual inductor iron core, secondary coil will be sensed this magnetic flux flow and produce a trip signal and come deenergization.As U.S. Patent number 4598331 and U.S. Patent number 5488303, therefore use ground arc breaker protector circuit to detect the ground state of live wire or center line, thus being connected by disconnecting consumers and 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 fault open circuit protector circuit ground fault open circuit protector circuit protection majority.For example, in feed cable, live wire or center line may produce electric arc to insulating barrier or metal shell.Though this electric arc may not can the individual is caused direct threat, but it may puncture insulating barrier even cause cable fire and initiation fire, so property is also had potential danger, this is a kind of very important potential threat equally for people's health and safety.
Disclose a kind of safety circuit of cable in U.S. Pat 6738241B1, it mainly is the controllable silicon that has adopted two parallel connections to arc protection and detection.One of them controllable silicon detects the electric arc between live wire and the metal shell, another controllable silicon detects the electric arc between center line and the metal shell, when producing electric arc between the metal shell of live wire or center line and cable, by a resistance step-down, diode halfwave rectifier and capacitor filtering trigger the controllable silicon gate pole, make the controllable silicon conducting, directly drive disconnect and cut off the electricity supply, but because this circuit is too direct to the sampling of electric arc, its sensitivity is too high and cause poor anti jamming capability, and mistake is jumped easily.And the sensitivity of arc current response can not be regulated and control rationally and effectively.In case there is big arc current to puncture controllable silicon easily.
Another kind of arc protection and ground-fault interrupter are disclosed in United States Patent (USP) 4931894, the two shared system.Because two kinds of functions all will be used differential transformer; so will have live wire that is enclosed with insulating barrier more than 10 amperes and center line and arc protection coil will pass the differential transformer iron core simultaneously at least; also on iron core, also to twine arc protection coil and secondary coil; owing to be subjected to the restriction of core volume; even big electric current live wire and center line directly pass iron core; the arc protection coil at most also can only enclose around 3-4; the number of turns etc. of arc protection coil all is severely limited, low and adjust difficulty to the response sensitivity of arc current.If the iron core of differential transformer is strengthened, certainly will make case for circuit breaker do very greatly, but because of the regulation of U.S. UL1699 standard to strict demand is arranged again on the full-size of circuit breaker, so can not improve its sensitivity by the method that adds large volume, and volume can not be littler, can't be used for the less place of installing space, the defective that this present class circuit breaker exists obviously that volume is big, cost is high, sensitivity is low, narrow application range etc. is difficult to overcome.Also have it only the electric arc between live wire and metal shell to be protected, and can not protect the electric arc between center line and metal shell.
Summary of the invention
The purpose of this utility model is in order to overcome above-mentioned weak point of the prior art, design a kind of simple and reasonable, volume is little, cost is low, reliable operation, highly sensitive and can accurately adjust the arc protection device of arc current value, scope of application feed cable wide, that all can effectively protect the electric arc of cable live wire and/or cable center line.
The arc protection device of feed cable of the present utility model; be used to be serially connected in power supply and with cable that load is connected between; its structure mainly is on the basis that comprises arc detection part and electric power disconnection part; replace live wire and center line to make the primary coil of current transformer in the arc detection part with the thinner arc detection lead of external diameter, make outstanding problems such as the big and sensitivity of volume is low be able to good solution.Described arc detection part is by the arc detection lead, magnet ring, and resistance R 1 and R2 composition, described resistance R 1 is connected with the cable center line, resistance R 2 is connected with the cable live wire, the other end of resistance R 1 and R2 is connected with the arc detection lead, the other end of arc detection lead passes or twines a few and be connected with the metal protection cover of cable after forming the primary coil of current transformer at magnet ring from magnet ring, the secondary coil of current transformer is connected with the signal input part of electric power disconnection part, and the K switch 1 and the K2 that will be serially connected between power supply and the cable through the electric power disconnection part when the induced current of current transformer secondary coil surpasses set point disconnect.
Reliability for the ease of regular or irregular this device of inspection, can set up the circuit test part of forming by test lead and button switch K 3 and resistance R 3 that is used for checking at any time the electric power disconnection part, described resistance R 3 be connected between cable live wire and the cable center line after button switch K 3 and test lead are connected, test lead wherein passes or twines a few and form the test coil of current transformer at magnet ring from magnet ring.
Also can set up voltage protection circuit and indicating circuit; described voltage protection circuit is the piezo-resistance RV1 that is connected between cable live wire and the cable center line; indicating circuit comprises resistance R 4, LED and diode D1, and described LED and diode D1 reverse parallel connection are after between resistance R 4 stube cable live wires and the cable center line.
Can select the earth leakage protective integrated circuit for use for the electric power disconnection part; its structure comprises live wire and the K switch between the center line 1 and K2 and the earth leakage protective integrated circuit U1 that is serially connected in power supply and cable; solenoid coil assembly SOD; controllable silicon SCR; diode D2; resistance R 5-R6; the reset button RESET of capacitor C 1-C6 and K switch 1 and K2; the signal input part of described earth leakage protective integrated circuit U1 is connected with the secondary coil of current transformer; the signal output part of earth leakage protective integrated circuit U1 is connected with the controllable silicon SCR gate pole; the negative electrode of controllable silicon SCR and anode be connected between cable live wire and the cable center line after solenoid coil is connected; when the primary coil of current transformer has arc current and reaches set point; the induction output signal of current transformer secondary coil is amplified the back by the earth leakage protective integrated circuit and is triggered the controllable silicon conducting; for solenoid coil provides operating current; K switch 1 and K2 are disconnected, cable and power supply are disconnected.
Advantage of the present utility model is: circuit is simple, and circuit adopts the sampling protection that suspends of metal protection cover, and the electric arc of generation can both effectively be protected in real time between the electric arc that produces between cable live wire and the metal protection cover and/or center line were overlapped with metal protection.Owing to only used a thinner arc detection lead to pass current transformer, therefore, the current transformer volume is very little, cost is low, can also change or regulate the number of turns of arc detection lead on the current transformer iron core very loosely, thus the accurately sensitivity of governing response electric arc between cable live wire or center line and metal protection cover; Because the detection to arc current is to realize by the through-flow variation of the secondary coil induced magnetism of current transformer; rather than the direct circuits for triggering opening device of arc current; this detection method to arc current has improved the especially silicon controlled fail safe of circuit breaker drive unit greatly, has prevented effectively because of the generation that electric arc causes fire takes place between cable live wire and/or cable center line and the cable metal protective sleeve.It is the arc protection device of the wide feed cable of a kind of scope of application.
Description of drawings
Accompanying drawing 1 is a kind of basic circuit schematic diagram in the utility model;
Accompanying drawing 2 is a kind of improvement circuit diagrams in the utility model;
Accompanying drawing 3 is a kind of circuit diagrams that use the earth leakage protective integrated circuit in circuit breaker drive unit of the present utility model.
Embodiment
Referring to accompanying drawing 1,1 among the figure is power firestreak, the 2nd, and the power supply center line, the 3rd, the cable live wire, the 4th, cable center line, the 5th, arc detection lead, the 6th, cable, the 7th, the metal protection cover of cable, the 8th, ground wire, the 9th, the magnet ring of current transformer, the 10th, current transformer secondary coil, the 11st, housing, the 12nd, circuit breaker drive unit.This basic circuit comprises that arc detection part and electric power disconnection partly form, described arc detection part is by arc detection lead 5, magnet ring 9, and resistance R 1 and R2 composition, described resistance R 1 is connected with cable center line 4, resistance R 2 is connected with cable live wire 1, the other end of resistance R 1 and R2 is connected with arc detection lead 5, the other end of arc detection lead 5 passes or twines a few and be connected with the metal protection cover 7 of cable after forming the primary coil of current transformer at magnet ring 9 from magnet ring 9, the secondary coil 10 of current transformer is connected with the signal input part of electric power disconnection part 12, one way switch K1 of double-break switch is serially connected between power firestreak 1 and the cable live wire 3, another way switch K2 is serially connected between power supply center line 2 and the cable center line 4, and the K switch 1 and the K2 that will be serially connected between power supply and the cable through the electric power disconnection part when the induced current of current transformer secondary coil surpasses set point disconnect.Breakdown burning out even initiation fire when making cable 6 can with metal protection cover 7 electric arcs not take place because of cable live wire 3 and/or cable center line 4.
Reliability for the ease of regular or irregular this device of inspection, can set up the circuit test part of forming by test lead 13 and button switch K 3 and resistance R 3, described resistance R 3 is connected with cable live wire 3, resistance R 3 other ends are connected with an end of test lead 13 through push-button switch TEST, and the other end of test lead 13 passes and is connected with cable center line 4 after current transformer 9 forms test coil.Also can have additional voltage protection circuit and indicating circuit; described voltage protection circuit is the piezo-resistance RV1 that is connected between cable live wire 3 and the cable center line 4; indicating circuit comprises resistance R 4, LED and diode D1; described resistance R 3 be connected between cable live wire and the cable center line after button switch K 1 and test lead are connected, test lead wherein passes or twines a few and form the test coil of current transformer at magnet ring from magnet ring.Its structure as shown in Figure 2.By LED indicating circuit operating state, employing piezo-resistance RV1 prevents and absorbs surge voltage, protects by diode D1 and 4 couples of LED of resistance R.
Before electric arc took place, current transformer 9 made primary coil not have arc current because of arc detection lead 5 no currents, also just can not form magnetic flux, and current transformer is ready.When electric arc occurring between live wire 3 and the metal protection cover 7, live wire 3 is by flow through arc detection lead 5 and constitute the loop to metal protection cover 7 by its formed primary coil of resistance R 2, at this moment the magnetic flux flow that produces on the current transformer will be detected by secondary coil 10, the circuits for triggering drive unit 12 that opens circuit then, make the disconnect K1 and the K2 of interlock disconnect the supply of cutting off the electricity supply.When electric arc occurring between center line 4 and the metal protection cover 7, center line 4 is by flow through arc detection lead 5 and constitute the loop to metal protection cover 7 by its formed primary coil of resistance R 1, at this moment the magnetic flux flow that equally also produces on the current transformer will be detected by secondary coil 10, the circuits for triggering drive unit 12 that opens circuit then, make the disconnect K1 and the K2 of interlock disconnect the supply of cutting off the electricity supply.When all electric arc occurring between live wire and center line and the metal protection cover, make K1 and K2 disconnect the supply of cutting off the electricity supply equally.
This circuit can accurately reasonably be controlled the response of arc current sensitivity.Be wrapped in the number of turn and the series resistance R1 that forms a primary coil on the current transformer core by adjusting arc detection lead 5; the resistance of R2; make the size of the arc current of arc protection be transferred to a rational value; when the electric arc that produces between the electric arc that produces between live wire 3 and the metal protection cover 7 or center line 4 and the metal protection cover 7 surpasses setting; will produce an imbalance on current transformer 9, at this moment current transformer secondary coil 10 drive unit 12 that will produce a trip signal and circuits for triggering open circuit makes being connected of K switch 1 and K2 deenergization and cable and load.
When being 120V such as supply voltage, setting resistance R 2 is 30 kilohms, arc detection lead 5 on the iron core of current transformer 9 around 1 circle, then arc current is 4 milliamperes, that is to say to need only the arc current that has more than or equal to 4 milliamperes between live wire and metal protection cover, circuit breaker drive unit 12 will move and cut off the electricity supply.As resistance R 2 is 60 kilohms, around 2 circles, then arc current is 2 MAHs tripping operation, when in like manner between center line and metal protection cover, producing electric arc as long as change the number of turn and the resistance of resistance R 1 size that just can regulate and control arc current of arc detection lead 5 on current transformer core.
When and for example supply voltage is 220V, setting resistance R 2 is 60 kilohms, arc detection lead 5 on the iron core of current transformer around 1 circle, then arc current is approximately 3.6 milliamperes, that is to say to need only the arc current that has more than or equal to 3.6 milliamperes between live wire and metal protection cover, circuit breaker drive unit 12 will move and cut off the electricity supply.As resistance R 2 is 120 kilohms, around 2 circles, then arc current is approximately 1.8 MAHs tripping operations, when in like manner between center line and metal protection cover, producing electric arc as long as change the number of turn and the resistance of resistance R 1 size that just can regulate and control arc current of arc detection lead 5 on current transformer 1 iron core.
Fig. 3 is the circuit diagram to the circuit breaker drive unit 12 employed a kind of embodiment among Fig. 1 or Fig. 2.Its circuit comprises earth leakage protective integrated circuit U1; solenoid coil assembly SOD; controllable silicon SCR; diode D2; resistance R 5-R6; capacitor C 1-C6 and reset button Reset; the 1st pin of described earth leakage protective integrated circuit U1 is connected with an end of current transformer secondary coil; the 2nd pin is connected through the other end of resistance R 6 with the current transformer secondary coil; resistance R 5 and capacitor C 1 are connected in parallel on the two ends of current transformer secondary coil; the 3rd pin of earth leakage protective integrated circuit U1 is connected with cable center line and controllable silicon SCR negative electrode with capacitor C 2-C5; capacitor C 2 other end U1 the 1st pin connects; the C3 other end is connected with controllable silicon SCR gate pole and C6 with U1 the 7th pin; the C4 other end is connected with the 5th pin with U1 the 4th; the C5 other end is connected with resistance R 7 with U1 the 8th pin; the C6 other end is connected with U1 the 6th pin; another terminating diode of R7 D2 negative pole; diode D2 is anodal to be connected with solenoid coil SOD with the controllable silicon anode, and the solenoid coil SOD other end is connected with the cable live wire.
Behind plug insertion socket, as long as press reset button Reset, power connection, loaded work piece.The operating voltage of earth leakage protective integrated circuit U1 is added to diode D2 halfwave rectifier, resistance R 7 step-downs by live wire L, solenoid coil SOL; capacitor C 5 filtering; give 8 pin of earth leakage protective integrated circuit U1,3 pin connect center line, for 8 pin and 3 pin of U1 are carried the 22V direct-current working volts.U1 can select VG54123 type earth leakage protective integrated circuit for use.Because the required operating current of U1 is very little, so the electric current of the solenoid coil SOL that flows through is also very little, the iron core in the solenoid coil is failure to actuate.Before electric arc takes place, pass no current in the formed primary coil of arc detection lead of current transformer, there is not magnetic flux in the current transformer, at this moment the circuit breaker drive unit is ready.
When live wire L has arc current to metal protection layer; arc current is from be wrapped in arc detection lead formed primary coil current transformer core on of metal protection layer through arc detection part; and then constitute the loop to live wire through resistance R 2; at this moment the magnetic flux flow that produces on the current transformer will be detected by the current transformer secondary coil; the signal that is induced is added to 1 pin of earth leakage protective integrated circuit U1 through an end of secondary coil; the other end is added to 2 pin of U1 through resistance R 6; C1 and R5 are connected in parallel on the two ends of secondary coil; wherein C1 is a resonant capacitance; can adjust the amplitude of input signal; R5 is a load resistance; can adjust the size of residual operating current, resistance R 6 plays the impedance matching effect.C2 is a filter capacitor, exchanges other ground.U1 is made up of differential amplifier, latch circuit and voltage stabilizing circuit.The output of differential amplifier 4 pin combines with an external capacitor C4, signal is amplified, and be connected to input 5 pin of latch circuit, before input 5 pin voltages reach setting, latch circuit output 7 pin keep low level always, when the detected arc current of the formed primary coil of arc detection lead during greater than setting 1.2mA, (set the arc detection lead can detect 6mA around a circle on current transformer core arc current, then can detect the arc current of 1.2mA) around five circles, at this moment output uprises, the interior circuit that links to each other with latch circuit is from 7 pin output drive signals, C6 filtering suppresses noise, drive signal is through stream C3 filtering, be added to the gate pole (being approximately the drive current of 0.3～0.5mA) of unidirectional controllable silicon S CR, the SCR conducting that is triggered, drive current is from live wire L, solenoid coil SOL, the anode A of unidirectional controllable silicon S CR, negative electrode K constitutes the loop to center line, SCR option BT169D type one-way SCR, make solenoid coil SOL obtain big running current, iron core in the solenoid coil travels forward under the effect of magnetic field force, back down tripping mechanism, thereby disconnect live wire K switch 1 and center line K switch 2, stop to power to the load through cable.When reworking,, can recover "on" position as long as press reset switch Reset.Wherein 8 pin of U1 and 3 pin are power ends, and operating voltage range is wide, and the resistance R 7 that 8 pin are connect can be determined supply power voltage to U1 by changing its resistance.
When center line N had arc current to metal protection layer, arc current was from be wrapped in arc detection lead formed primary coil current transformer core on of metal protection layer through arc detection part, and then constituted the loop through resistance R 1 and center line.At this moment the magnetic flux flow that produces on the current transformer will be detected by the current transformer secondary coil, and the operation principle of circuit breaker drive unit part is the same.
Be parallel with piezo-resistance RV2 between the anode of controllable silicon SCR and the negative electrode, be used to prevent and absorb surge voltage and protect controllable silicon.
Claims (5)
1; a kind of arc protection device of feed cable; be serially connected in power supply and with cable that load is connected between; comprise arc detection part and electric power disconnection part; it is characterized in that the arc detection part is by the arc detection lead; magnet ring; and resistance R 1 and R2 composition; described resistance R 1 is connected with the cable center line; resistance R 2 is connected with the cable live wire; the other end of resistance R 1 and R2 is connected with the arc detection lead; the other end of arc detection lead passes or twines a few and is connected with the metal protection cover of cable after forming the primary coil of current transformer at magnet ring from magnet ring, and the secondary coil of current transformer is connected with electric power disconnection signal input part partly.
2. the arc protection device of feed cable as claimed in claim 1; it is characterized in that also comprising the circuit test part of forming by test lead and button switch K 3 and resistance R 3; described resistance R 3 be connected between cable live wire and the cable center line after button switch K 3 and test lead are connected; test lead wherein passes or twines a few and form the test coil of current transformer at magnet ring from magnet ring.
3. the arc protection device of feed cable as claimed in claim 2; it is characterized in that also including voltage protection circuit and indicating circuit; described voltage protection circuit is the piezo-resistance RV1 that is connected between cable live wire and the cable center line; indicating circuit comprises resistance R 4, LED and diode D1, and described LED and diode D1 reverse parallel connection are after between resistance R 4 stube cable live wires and the cable center line.
4. as the arc protection device of claim 1 or 2 or 3 described feed cables; it is characterized in that electric power disconnection partly comprises live wire and the K switch between the center line 1 and K2 and the earth leakage protective integrated circuit U1 that is serially connected in power supply and cable; solenoid coil assembly SOD; controllable silicon SCR; diode D2; resistance R 5-R6; the reset button RESET of capacitor C 1-C6 and K switch 1 and K2; the signal input part of described earth leakage protective integrated circuit U1 is connected with the secondary coil of current transformer; the signal output part of earth leakage protective integrated circuit U1 is connected with the controllable silicon SCR gate pole, the negative electrode of controllable silicon SCR and anode be connected between cable live wire and the cable center line after solenoid coil is connected.
5. the arc protection device of feed cable as claimed in claim 4 is characterized in that being parallel with piezo-resistance RV2 between the anode of described controllable silicon SCR and the negative electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520071869 CN2831570Y (en) | 2005-05-30 | 2005-05-30 | Arc protector of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520071869 CN2831570Y (en) | 2005-05-30 | 2005-05-30 | Arc protector of power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2831570Y true CN2831570Y (en) | 2006-10-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520071869 Expired - Fee Related CN2831570Y (en) | 2005-05-30 | 2005-05-30 | Arc protector of power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2831570Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868580A (en) * | 2014-05-27 | 2015-08-26 | 安徽华盛科技控股股份有限公司 | CIT asynchronous uninterruptible static diverter switch system and control method thereof |
| CN108475914A (en) * | 2016-01-19 | 2018-08-31 | 布利克斯特科技公司 | Circuit for disconnecting alternating current |
-
2005
- 2005-05-30 CN CN 200520071869 patent/CN2831570Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868580A (en) * | 2014-05-27 | 2015-08-26 | 安徽华盛科技控股股份有限公司 | CIT asynchronous uninterruptible static diverter switch system and control method thereof |
| CN108475914A (en) * | 2016-01-19 | 2018-08-31 | 布利克斯特科技公司 | Circuit for disconnecting alternating current |
| CN108475914B (en) * | 2016-01-19 | 2021-05-07 | 布利克斯特科技公司 | Circuit for disconnecting an alternating current |
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| 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 |