CN1601842A - Arc and leakage protector - Google Patents
Arc and leakage protector Download PDFInfo
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- CN1601842A CN1601842A CN 200410066921 CN200410066921A CN1601842A CN 1601842 A CN1601842 A CN 1601842A CN 200410066921 CN200410066921 CN 200410066921 CN 200410066921 A CN200410066921 A CN 200410066921A CN 1601842 A CN1601842 A CN 1601842A
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Abstract
The protector includes control circuit board, failure detector circuit, tripping device. failure detector circuit includes arc detection transformer, amplifying triode, resistances, capacitances, regulator and transformer for detecting zero sequence current. failure detector circuit detects fault signal, access control circuit board analyzes and treats and sends out specific signal, and drives the tripping device to cut off power source. advantages are: integratd functions of detecting electric arc, faults of electric leakage, short circuit and overcurrent, automatic detecting fault at normal running and automatic cutting off power source in very short time.
Description
Technical field
The present invention relates to a kind of electric arc, leak current fault line protector; particularly a kind of being applied in the low voltage power supply system; when between the transmission line or the electric arc that causes owing to fault between transmission line and the ground, electric leakage and when burning takes place, the electric arc and the earth leakage protective device of the power supply of can cutting off the electricity supply automatically.
Background technology
At present, along with development of global economy, the raising of people's living standard, per capita household electricity consumption increases severely.And in the low-voltage distribution feed system,, make supply line often be in full load condition along with the continuous increase of electrical equipment, the continuous increase of single-machine capacity, be in overload sometimes even for a long time, thereby the insulating barrier on its supply line surface is very easily aging; And general air switch and earth leakage protection switch are for because aging electric arc that takes place of circuit surface insulation layer and then the burning that causes can not be moved timely and effectively, and the phenomenon that causes the electric arc in the transmission line and produce arc burning takes place repeatedly.There is data statistics to show, according to adding up in the meeting on September 23rd, 2003 of U.S. Consumers Council: there is every year the fire that causes because of electrical equipment to have 73500, dead 591, the wounded 2247, ten hundred million property loss; Domestic document announcement, 50% owing to electric wiring causes in the fire that took place in 1996.
Summary of the invention
Technical problem to be solved by this invention is in order to overcome the safety problem that electric leakage, electric arc, overcurrent, overvoltage etc. cause, it is electric arc and earth leakage protective device that a kind of new household electrical appliance safety device is provided.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of electric arc and earth leakage protective device comprise control circuit board, the failure detector circuit that links to each other with the signal input part of control circuit board, the trip gear that links to each other with the signal output part of control circuit board;
Described failure detector circuit comprises that arc-detection instrument transformer, signal load resistance R 16, current-limiting resistance R23, signal coupling capacitance C14, signal amplifying triode V3, resistance R 15, R17, R18, capacitor C 15, pressurizer VD3 and zero-sequence current detect instrument transformer;
The arc-detection instrument transformer is serially connected on the live wire or zero line of AC power; Signal load resistance R 16 is connected in parallel on the two ends of arc-detection instrument transformer, a termination current-limiting resistance R23 of arc-detection instrument transformer, meet signal amplifying triode V3 again after, the access control circuit board; This end also connects resistance R 15 after the parallel connection, capacitor C 14 again with the common port access control circuit board of pressurizer VD3; The other end of arc-detection instrument transformer L3 is connected to the tie point of resistance R 17, resistance R 18;
Resistance R 18 and capacitor C 15 backs in parallel one end ground connection, the other end is with the negative electrode access control circuit board of resistance R 17 series connection backs and pressurizer VD3; The plus earth of pressurizer VD3;
It is that string is imported, exports in the two-wire circuit in AC power that zero-sequence current detects instrument transformer; Zero-sequence current detects the signal output part of instrument transformer, access control circuit board signal input.
Described control circuit board comprises power circuit, signal amplification circuit, signal analysis and processing circuit and drive circuit; Fault-signal inserts signal amplification circuit, signal analysis and processing circuit and drive circuit, and output signal inserts trip gear.
Described trip gear comprises a pair of moving contact, a pair of fixed contact and trip assembley therefor, its fixed contact links to each other with the incoming line of AC power, tripping coil in moving contact and the trip assembley therefor, the output line of AC power link to each other, and trip assembley therefor is by linking to each other with microprocessor in the signal analysis and processing circuit behind the drive circuit;
Described trip gear is the tripping mechanism that needs artificial forced resetting; Described microprocessor is the P89LPCL901 chip of tape comparator MCU; Transducer magnet ring in arc-detection instrument transformer, the zero-sequence current detection instrument transformer is by permeability magnetic material--and the iron silica-alumina material is made; Described power circuit comprises that a rectifier circuit and one are through the high withstand voltage linear power supply circuit after 431 voltage reference module and high withstand voltage triode electric current amplify again after the rectifier bridge rectification.
Compared with prior art, the invention has the advantages that: have function characteristics such as current collection arc fault, earth leakage fault, short trouble and over current fault detection, it can automatic fault detection when normal power supply, and the function of cutting off the electricity supply automatically in the extremely short time.Do not need extra power supply when the present invention works, discern automatically with online mode and handle above-mentioned information, and directly cut off the electricity supply; Fault is manually pressed reset button of the present invention and is made the sound closing of contact once more after getting rid of, the system restoration power supply.In addition; compact conformation of the present invention, volume be small and exquisite, reliable, need not to add in addition power supply and advantage such as easy for installation, and can cut off the electricity supply in the very first time that fault takes place, so use the present invention; can solve the problem that electric arc, leak current fault cause fire effectively, play the effect of protection circuit.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is a circuit working schematic diagram of the present invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
As shown in Figure 1 and Figure 2,, a kind of electric arc and earth leakage protective device, comprise control circuit board 1, the failure detector circuit 2 that links to each other with the signal input part of control circuit board 1, the trip gear 3 that links to each other with the signal output part of control circuit board 1; Described failure detector circuit 2 comprises that arc-detection instrument transformer, signal load resistance R 16, current-limiting resistance R23, signal coupling capacitance C14, signal amplifying triode V3, resistance R 15, R17, R18, capacitor C 15, pressurizer VD3 and zero-sequence current detect instrument transformer L2;
Arc-detection instrument transformer L3 is serially connected on the live wire L or zero line N of AC power; Signal load resistance R 16 is connected in parallel on the two ends of arc-detection instrument transformer L3, the termination current-limiting resistance R23 of arc-detection instrument transformer L3, meet signal amplifying triode V3 again after, access control circuit board 1; This end also connects resistance R 15 after the parallel connection, capacitor C 14 again with the common port access control circuit board 1 of pressurizer VD3; The other end of arc-detection instrument transformer L3 is connected to the tie point of resistance R 1, resistance R 18;
Resistance R 18 and capacitor C 15 backs in parallel one end ground connection, the other end is with the negative electrode access control circuit board 1 of resistance R 17 series connection backs and pressurizer VD3; The plus earth of pressurizer VD3;
Zero-sequence current detects instrument transformer L2, is that string is imported, exports in the two-wire circuit in AC power; Zero-sequence current detects the signal output part of instrument transformer L2, access control circuit board 1 signal input part.
Described control circuit board 1 comprises power circuit 4, signal amplification circuit 5, signal analysis and processing circuit 6 and drive circuit 7; Fault-signal inserts signal amplification circuit 5, signal analysis and processing circuit 6 and drive circuit 7, and output signal inserts trip gear 3.
Described trip gear 3 comprises a pair of moving contact S11, S21, a pair of fixed contact S12, S22 and trip assembley therefor, its fixed contact S12, S22 link to each other with the incoming line of power supply, and the tripping coil L1 in moving contact S11, S21 and the trip assembley therefor, the output line of power supply link to each other; Trip assembley therefor links to each other by drive circuit 7 microprocessors back and in the signal analysis and processing circuit 6.
Described trip gear 3 is the tripping mechanisms that need artificial forced resetting; Microprocessor is the P89LPCL901 chip of tape comparator MCU; The transducer magnet ring that arc-detection instrument transformer L3, zero-sequence current detect among the instrument transformer L2 is a permeability magnetic material--the iron silica-alumina material is made;
Described power circuit comprises that a rectifier circuit and one are through the high withstand voltage linear power supply circuit after 431 voltage reference module U1 and high withstand voltage triode V2 electric current amplify again after the rectifier bridge rectification.
Circuit working principle of the present invention is as follows:
As shown in Figure 2; the alternating current of 230V (120V); through a Leaded Ceramic Disc Capacitor C16, the piezo-resistance RY1 that absorbs surge, the high voltage surge protective circuit that Chip-R R21 forms by absorbing high-frequency; be connected to tripping coil L1 then (when having big electric current to produce in the circuit; it is open circuit that coil is threaded off); be connected to rectifier bridge VD1, interchange is converted into direct current, work in order to the supply circuit other parts.
That in parallel with rectifier bridge VD1 dc terminal is controllable silicon V1, and its anode and negative electrode are directly in parallel with rectifier bridge, and grid links to each other with resistance R 1 with capacitor C 1, and receives 5 pin of the microprocessor U2 in the signal analysis and processing circuit 6 by VD4.After grid was received an operation voltage signal that transmits from R1, the conducting at once of anode and negative electrode produced a big electric current and forces tripping coil L1 to thread off with protective circuit on the loop;
Resistance R 5 and R4 dividing potential drop prevent the anode A overvoltage of start-up course U1 and damage U1; C3 provides one to exchange negative feedback, is used for preventing the U1 self-excitation.The U1 anode voltage offers the low-pressure end microelectronic circuits after too high withstand voltage triode V2 electric current amplifies; The collector series connection dropping resistor R3 of triode V2 is to reduce the thermal losses of V2; Power after the π filtering of the 3.6V direct current of V2 output through C4, R10, C5 composition and give signal analysis and processing circuit 6.
1 pin of microprocessor U2 in the signal analysis and processing circuit 6 connects power supply, and 2,3,4 pin are unsettled, the output of 5 pin; 7 pin of U2 are positive inputs of comparator, and 6 pin are that high-low level detects input, 8 pin ground connection.Determine after circuit has fault at U2, it can be exported a high level and give diode VD4 and resistance R 1, promptly offers actuating signal of grid of controllable silicon V1.Wherein whether microprocessor U2 has the potential pulse that reaches setting to judge by detecting, if there is the pulse that reaches setting to occur, then sending high level makes it drive trip gear 3 actions for drive circuit 7, cut off the electricity supply, stop power supply, and stopping to wait for 50～70ms, wait is counted again then; Do not occur if reach the pulse of setting, then do not send high level, microprocessor U2 returns original state and detects again.Here the foundation of microprocessor judges is whether signal pulse has the current half/second of arc more than or equal to 8 times, gives drive circuit 7 and then forces trip gear 3 to be threaded off if then send signal, cuts off the electricity supply and stops power supply.If signal pulse is less than current half/second that arc is arranged for 8 times, then counter empties, and returns MCU and waits for again.When overcurrent or leak current fault signal, microprocessor U2 can carry out processing and amplifying with sort signal, sends high level and gives drive circuit 7, and then make trip gear 3 actions, cuts off the electricity supply and stops power supply.
What link to each other with 6 pin of U2 is the leakage current testing circuit, comprises that U3 and zero-sequence current detect instrument transformer L2, and resistance R 9, R11, R12, R13, capacitor C 6, C7, C8, C9, C10, C11, C12 and triode V3.Current-limiting resistance R9, filter capacitor C6 link to each other with 8 pin of U3, for U3 provides power supply; 1 pin of U3 links to each other with ground by capacitor C 7, and C7 plays one and eliminates the comparator misoperation; 2 pin are connected in the two ends that zero-sequence current detects instrument transformer L2 by R13 with 1 pin; C8 and R12 are then in parallel with zero-sequence current detection instrument transformer L2, and C8 plays jamproof effect, and R12 is a signal load, and induced current is converted into voltage for sampling, and the size of R12 is determining the sensitivity of data sampling, and R13 then is the protective resistance of 2 pin input; 2 pin connect and insert 3 pin and ground connection after decoupling capacitor C10,4 pin and 5 pin meet decoupling capacitor C11; Insert between 6 pin and 7 pin and inhale the capacitor C 9 of making an uproar;
Zero-sequence current detection instrument transformer L2 detection is passed through its lead as no leaky, and then 7 pin of U3 are just exported a low level and given R11 (if any electric leakage, then 7 pin of U3 are just exported a high level and given R11); After the V3 paraphase is amplified, deliver to 6 pin of U2 and handle, need to judge whether to thread off for it.R14 and the C13 in addition that link to each other with 6 pin of U2, R14 mainly is to high level of 6 pin, C13 is one and exchanges decoupling capacitor, is used for absorbing interference signal.
What link to each other with 7 pin of U2 is electric arc, over-current detection circuit, and arc-detection instrument transformer L3 is serially connected on the live wire L or zero line N of AC power; Signal load resistance R 16 is connected in parallel on the two ends of arc-detection instrument transformer L3, behind the termination current-limiting resistance R23 of arc-detection instrument transformer L3, is admitted to 6 pin of the microprocessor U2 in the control circuit board 1 through signal amplifying triode V3; This end also connects the resistance R 15 after the parallel connection, 7 pin of the microprocessor U2 of capacitor C 14 in the common port 3 pin access control circuit boards 1 of pressurizer VD3; The other end of arc-detection instrument transformer L3 is connected to the tie point of resistance R 17, resistance R 18; Resistance R 18 and capacitor C 15 backs in parallel one end ground connection, the other end is with 1 pin of the microprocessor U2 of the negative electrode 2 pin access control circuit boards 1 of resistance R 17 series connection backs and pressurizer VD3, i.e. low-tension supply anode; The anode 1 pin ground connection of pressurizer VD3;
Whether there are electric arc and over-current phenomenon avoidance to produce in the arc-detection instrument transformer L3 testing circuit, if any then producing a current signal; C14 plays the effect of signal coupling, and C15 plays high-frequency coupling; R16 is a signal load, and induced current is converted into voltage for sampling; Pressurizer VD3 plays the overvoltage protection effect.Resistance R 17, R18 provide a dividing potential drop, allow arc-detection instrument transformer L3 float on the dividing point that (because comparative level is about 1.2V, signal magnitude does not have rule, and dividing potential drop can not be too high, high can cause circuit erroneous action, low can influence sensitivity.)。(C14 and C15 form communication channel, and R15 provides certain direct current to deliver to 7 pin of U2 through R15 and C14 behind the signal voltage stack dividing point voltage.), if signal polarity is opposite, then pass through anode 1 pin and the common port 3 pin bleed off electric currents of VD3; Perhaps when voltage signal is too high, common port 3 pin by VD3 and negative electrode 2 pin reach the effect that signal level is clamped down on to power positive end bleed off electric current.Arrive to a certain degree when electric current is excessive, the dividing potential drop of R23 and R11 makes the V3 conducting, and the low level of a some cycles appears in 6 pin of U2, and U2 forces V1 to drive and threads off.Here the connection of VD3 has multiple, the connection here is with general and to connect positive reversal connection diode different, it can guarantee to have removed otiose polarity reversing signal, but has guaranteed the maximum constraints (supply voltage+0.7V), make signal not decay or distortion in allowed band of useful signal.
Test circuit is made up of R19, R20 and Test Switchboard SW1.Rectifier bridge links to each other with 6 pin of U2 through the base stage that switch SW 1 meets R19, R20 access triode V3 again.SW1 is pressed when Test Switchboard, circuit is connected, the base stage of triode V3 obtains a signal, 6 pin to U2 transmit a low level, 5 pin of U2 are just exported the grid that a high level is given controllable silicon V1, and the conducting at once of the anode of controllable silicon V1 and negative electrode produces a big electric current on the loop, cause tripping coil L1 to thread off, power supply all cuts off.
Claims (7)
1, a kind of electric arc and earth leakage protective device, comprise control circuit board (1), the failure detector circuit (2) that links to each other with the signal input part of control circuit board (1), with the trip gear (3) that the signal output part of control circuit board (1) links to each other, it is characterized in that:
Described failure detector circuit (2) comprises that arc-detection instrument transformer (L3), signal load resistance (R16), current-limiting resistance (R23), signal coupling capacitance (C14), signal amplifying triode (V3), resistance (R15), (R17), (R18), electric capacity (C15), pressurizer (VD3) and zero-sequence current detect instrument transformer (L2);
Arc-detection instrument transformer (L3) is serially connected on the live wire (L) or zero line (N) of AC power; Signal load resistance (R16) is connected in parallel on the two ends of arc-detection instrument transformer (L3), a termination current-limiting resistance (R23) of arc-detection instrument transformer (L3), connect signal amplifying triode (V3) again after, access control circuit board (1); This end also connects resistance (R15) after the parallel connection, electric capacity (C14) again with the common port access control circuit board (1) of pressurizer (VD3); The other end of arc-detection instrument transformer (L3) is connected to the tie point of resistance (R17), resistance (R18);
After resistance (R18) and electric capacity (C15) parallel connection, an end ground connection, the other end with after resistance (R17) series connection again with the negative electrode access control circuit board (1) of pressurizer (VD3); The plus earth of pressurizer (VD3);
Zero-sequence current detects instrument transformer (L2), is serially connected in AC power input, the output two-wire circuit; Zero-sequence current detects the signal output part of instrument transformer (L2), access control circuit board (1) signal input part.
2, electric arc as claimed in claim 1 and earth leakage protective device is characterized in that: described control circuit board (1) comprises power circuit (4), signal amplification circuit (5), signal analysis and processing circuit (6) and drive circuit (7); Fault-signal inserts signal amplification circuit (5), signal analysis and processing circuit (6) and drive circuit (7), and output signal inserts trip gear (3).
3, electric arc as claimed in claim 1 and earth leakage protective device; it is characterized in that: described trip gear (3) comprises a pair of moving contact (S11; S21), a pair of fixed contact (S12; S22) and trip assembley therefor; (S12 S22) links to each other moving contact (S11 to its fixed contact with the incoming line of AC power; S21) link to each other with tripping coil (L1), the output line of AC power in the trip assembley therefor, trip assembley therefor links to each other by drive circuit (7) back and the microprocessor in the signal analysis and processing circuit (6).
4, electric arc as claimed in claim 1 and earth leakage protective device is characterized in that: described trip gear (3) is the tripping mechanism of the artificial forced resetting of needs.
5, electric arc as claimed in claim 1 and earth leakage protective device is characterized in that: described microprocessor is the P89LPCL901 chip of tape comparator MCU.
6, electric arc as claimed in claim 1 and earth leakage protective device is characterized in that: the transducer magnet ring that described arc-detection instrument transformer (L3), zero-sequence current detect in the instrument transformer (L2) is made by permeability magnetic material one iron silica-alumina material.
7, electric arc as claimed in claim 1 and earth leakage protective device is characterized in that: described power circuit (4) comprises that a rectifier circuit and one are through the high withstand voltage linear power supply circuit after 431 voltage reference module (U1) and high withstand voltage triode (V2) electric current amplify again after the rectifier bridge rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100669214A CN100370664C (en) | 2004-09-30 | 2004-09-30 | Arc and leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100669214A CN100370664C (en) | 2004-09-30 | 2004-09-30 | Arc and leakage protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1601842A true CN1601842A (en) | 2005-03-30 |
| CN100370664C CN100370664C (en) | 2008-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100669214A Expired - Fee Related CN100370664C (en) | 2004-09-30 | 2004-09-30 | Arc and leakage protector |
Country Status (1)
| Country | Link |
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| CN (1) | CN100370664C (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384042C (en) * | 2005-07-15 | 2008-04-23 | 蒋闯 | Flashover leakage protector and protection method thereof |
| CN100432683C (en) * | 2005-03-31 | 2008-11-12 | 珠海格力电器股份有限公司 | Fault arc detection method and protection circuit thereof |
| CN100452598C (en) * | 2005-08-19 | 2009-01-14 | 珠海格力电器股份有限公司 | Fault arc protection circuit and fault arc detection method |
| CN1960102B (en) * | 2006-09-29 | 2010-10-06 | 蒋闯 | Arc, earth leakage protection, and protection method |
| CN102183684A (en) * | 2010-01-15 | 2011-09-14 | 三星电子株式会社 | Arc discharge detecting circuit, light source driving apparatus and method of driving a light source using the same |
| CN102611069A (en) * | 2012-04-18 | 2012-07-25 | 天津市鸿远电气设备有限公司 | Electric arc fault protector |
| CN102856887A (en) * | 2011-06-28 | 2013-01-02 | 西门子公司 | Resetting of disturbance arc protection device |
| CN101903966B (en) * | 2007-12-18 | 2013-08-14 | 伊顿公司 | Trip unit and electrical switching apparatus including a movable indicator to indicate selection of an arc reduction maintenance system current condition |
| CN103454582A (en) * | 2013-09-03 | 2013-12-18 | 辽宁工程技术大学 | Detection device for broken-down electric arcs of breaker |
| CN104251945A (en) * | 2013-06-28 | 2014-12-31 | 上海电科电器科技有限公司 | Arc fault detecting device |
| CN106449320A (en) * | 2016-08-16 | 2017-02-22 | 华通机电股份有限公司 | Energy-saving and consumption-reducing residual action current circuit breaker |
| CN110297151A (en) * | 2019-05-24 | 2019-10-01 | 温州华亚电气有限公司 | A kind of observation circuit protection circuit of ground fault earth leakage protective device operation troubles |
| CN110896210A (en) * | 2018-09-12 | 2020-03-20 | 简树 | Single-phase electric leakage circuit breaker control system |
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| JPH03159519A (en) * | 1989-11-16 | 1991-07-09 | Togami Electric Mfg Co Ltd | Automatic disconnection detector |
| JPH10271663A (en) * | 1997-03-26 | 1998-10-09 | Toshiba Corp | Protective relay device |
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| CN2762332Y (en) * | 2004-09-30 | 2006-03-01 | 宁波习羽电子发展有限公司 | Arc and earth leakage protective device |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432683C (en) * | 2005-03-31 | 2008-11-12 | 珠海格力电器股份有限公司 | Fault arc detection method and protection circuit thereof |
| CN100384042C (en) * | 2005-07-15 | 2008-04-23 | 蒋闯 | Flashover leakage protector and protection method thereof |
| CN100452598C (en) * | 2005-08-19 | 2009-01-14 | 珠海格力电器股份有限公司 | Fault arc protection circuit and fault arc detection method |
| CN1960102B (en) * | 2006-09-29 | 2010-10-06 | 蒋闯 | Arc, earth leakage protection, and protection method |
| CN101903966B (en) * | 2007-12-18 | 2013-08-14 | 伊顿公司 | Trip unit and electrical switching apparatus including a movable indicator to indicate selection of an arc reduction maintenance system current condition |
| CN102183684A (en) * | 2010-01-15 | 2011-09-14 | 三星电子株式会社 | Arc discharge detecting circuit, light source driving apparatus and method of driving a light source using the same |
| CN102183684B (en) * | 2010-01-15 | 2015-08-12 | 三星显示有限公司 | The method of arc discharge testing circuit, apparatus of driving light source and driving light source |
| CN102856887B (en) * | 2011-06-28 | 2016-12-21 | 西门子公司 | The reset of interference arc preventer |
| CN102856887A (en) * | 2011-06-28 | 2013-01-02 | 西门子公司 | Resetting of disturbance arc protection device |
| CN102611069A (en) * | 2012-04-18 | 2012-07-25 | 天津市鸿远电气设备有限公司 | Electric arc fault protector |
| CN104251945A (en) * | 2013-06-28 | 2014-12-31 | 上海电科电器科技有限公司 | Arc fault detecting device |
| CN103454582A (en) * | 2013-09-03 | 2013-12-18 | 辽宁工程技术大学 | Detection device for broken-down electric arcs of breaker |
| CN106449320A (en) * | 2016-08-16 | 2017-02-22 | 华通机电股份有限公司 | Energy-saving and consumption-reducing residual action current circuit breaker |
| CN106449320B (en) * | 2016-08-16 | 2018-08-14 | 华通机电股份有限公司 | A kind of energy-saving residual action current breaker |
| CN110896210A (en) * | 2018-09-12 | 2020-03-20 | 简树 | Single-phase electric leakage circuit breaker control system |
| CN110297151A (en) * | 2019-05-24 | 2019-10-01 | 温州华亚电气有限公司 | A kind of observation circuit protection circuit of ground fault earth leakage protective device operation troubles |
| CN110297151B (en) * | 2019-05-24 | 2022-04-08 | 温州华亚电气有限公司 | Monitoring circuit protection circuit for operation fault of earth fault leakage protector |
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| CN100370664C (en) | 2008-02-20 |
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Denomination of invention: Arc and leakage protector Effective date of registration: 20160112 Granted publication date: 20080220 Pledgee: Ping An Bank Ltd Ningbo branch Pledgor: Xiyu Electronic Development Co., Ltd., Ningbo Registration number: 2016990000020 |
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Address after: 315317, No. 6, development avenue, Qiaotou Industrial Zone, Zhejiang, Cixi Patentee after: Ningbo Xi Yu electrical Polytron Technologies Inc Address before: 315317, No. 6, development avenue, Qiaotou Industrial Zone, Zhejiang, Cixi Patentee before: Xiyu Electronic Development Co., Ltd., Ningbo |
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