CN103872658B - Multifunction self-resetting formula is crossed, under-voltage protector - Google Patents

Multifunction self-resetting formula is crossed, under-voltage protector Download PDF

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Publication number
CN103872658B
CN103872658B CN201410132422.4A CN201410132422A CN103872658B CN 103872658 B CN103872658 B CN 103872658B CN 201410132422 A CN201410132422 A CN 201410132422A CN 103872658 B CN103872658 B CN 103872658B
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China
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circuit
relay
input
voltage
protection
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CN201410132422.4A
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Chinese (zh)
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CN103872658A (en
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张斌
高守君
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湖南星球智能电气科技开发有限公司
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Priority to CN201410132422.4A priority Critical patent/CN103872658B/en
Publication of CN103872658A publication Critical patent/CN103872658A/en
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Abstract

A kind of Multifunction self-resetting formula is crossed, under-voltage protector; main circuit is serially connected in centre by the normally opened contact of latch-in relay and is divided into the power end of main circuit and the load end of main circuit; and the switching of latch-in relay is controlled by total control circuit completely, excess voltage protection and low-voltage protection circuit sampling end are connected to the outfan of the Transformer Rectifier filter circuit of main circuit power;The sampling end of overcurrent, short-circuit protection circuit and leakage protection circuit is all connected to main circuit load end, and the outfan of four protection circuits is connected to total control circuit;Self-checking circuit two ends are connected across load end and the power end of main circuit respectively.Integrated degree of the present invention is high, and defencive function is comprehensive, installs simple, easy to use, energy saving, and cost performance is high.

Description

Multifunction self-resetting formula is crossed, under-voltage protector

Technical field

The present invention relates to the electrical equipment of a kind of electric terminal user's power distribution protection, be specifically related to a kind of Multifunction self-resetting formula cross, under-voltage protector.

Background technology

The distribution box of existing electric terminal user is all to be protected short circuit and the leak current fault of total loop by an air switch or an earth leakage protective device, again by a self-resetting type mistake, the under-voltage protector overvoltage to total loop, under-voltage fault is protected, two such product uses simultaneously, the most relatively costly, volume is bigger, also expense material of taking a lot of work is installed, and air switch or earth leakage protective device are the lowest to the protection precision of over current fault, it is easy to electrical safety accident, self-resetting type mistake, under-voltage protector is the break-make controlling main circuit with common high power relay, and commonly high power relay electric energy to be leaned on maintains conducting, long-time energising is unfavorable for energy-conservation.

Summary of the invention

The technical problem to be solved is: solve the problem that above-mentioned prior art exists; and provide a kind of have self-resetting type overvoltage protection, self-resetting type low-voltage protection, short interruption protection, overcurrent open circuit protection and leakage, breaking protection Multifunction self-resetting formula cross, under-voltage protector; integrated degree is high; defencive function is comprehensive; install simple; easy to use, energy saving, cost performance is high.

The present invention adopts the technical scheme that:

A kind of Multifunction self-resetting formula is crossed, under-voltage protector; main circuit is serially connected in centre by the normally opened contact of latch-in relay and is divided into the power end of main circuit and the load end of main circuit; and the switching of latch-in relay is controlled by total control circuit completely; the input of Transformer Rectifier filter circuit is connected to the power end of main circuit, and excess voltage protection and low-voltage protection circuit sampling end are connected to the outfan of Transformer Rectifier filter circuit;The sampling end of overcurrent, short-circuit protection circuit and leakage protection circuit is all connected to main circuit load end, and the outfan of above-mentioned excess voltage protection, low-voltage protection circuit, overcurrent, short-circuit protection circuit and leakage protection circuit is connected to total control circuit;Self-checking circuit one end is connected to main circuit load end and passes on the live wire of zero sequence current mutual inductor, and the self-checking circuit other end is connected on the zero line of main circuit power end.

In technique scheme; described excess voltage protection is made up of bleeder circuit, voltage comparator circuit and overvoltage failure indicating circuit; the input of bleeder circuit is connected to Transformer Rectifier filter circuit outfan; the outfan of bleeder circuit is connected to double 4 input AND gate circuit the 2nd input pins of total control circuit; double 4 input AND gate circuits control the break-make of the first relay; and the contact of the first relay controls the break-make of the second relay; second relay is latch-in relay, and its normally opened contact controls the break-make of main circuit.

In technique scheme; described low-voltage protection circuit is made up of bleeder circuit, voltage comparator circuit and under-voltage failure indicating circuit; bleeder circuit one end is connected to Transformer Rectifier filter circuit outfan; carrying out under-voltage sampling, the bleeder circuit other end is connected on double 4 input AND gate circuit the 5th input pins of total control circuit.

In technique scheme; described overcurrent, short-circuit protection circuit are connected and composed by current transformer, the second controllable silicon and diode, capacitance-resistance filter regulation circuit; current transformer is arranged on main circuit load end live wire; secondary transformer output is followed by the second SCR control pole through diode, capacitance-resistance filter regulation circuit, and the second controllable silicon anode is connected to double 4 input AND gate circuit the 4th input pins of total control circuit.

In technique scheme; described leakage protection circuit is connected and composed by zero sequence current mutual inductor, the first controllable silicon and diode, capacitance-resistance filter regulation circuit; the live wire of main circuit load end and zero line are also cross zero sequence current mutual inductor; the output of zero sequence current mutual inductor secondary is followed by the first SCR control pole through diode, capacitance-resistance filter regulation circuit, and the first controllable silicon anode is connected to double 4 input AND gate circuit the 3rd input pins of total control circuit.

Total control circuit is by double 4 input AND gate circuit and bleeder circuits, delay circuit, 3rd audion, first relay, second relay connects and composes, 4 inputs of double 4 input AND gate circuits are respectively connecting to excess voltage protection, low-voltage protection circuit, overcurrent, short-circuit protection circuit and the outfan of leakage protection circuit, the outfan of double 4 input AND gate circuits is through bleeder circuit, delay circuit is connected to the base stage of the 3rd audion, after 3rd audion and the series connection of the first relay, two ends are connected between anode and the negative terminal of Transformer Rectifier filter regulator circuit output power supply, and the second of the first relay group of contact directly controls the line bag power channel of the second relay.

The present invention is successfully realized air switch first in the distribution protection equipment of electric terminal user, earth leakage protective device and self-resetting type mistake, the Multifunctional height of under-voltage protector merges integrated unification, make a product have overcurrent protection simultaneously, short-circuit protection, earth leakage protective, self-resetting type overvoltage, the multi-protective function such as low-voltage protection and indicating fault, and the precision of overcurrent protection is the highest, maintain main circuit to be switched on or switched off state to need not consume electric energy, therefore the present invention has relatively much progress than prior art, and energy-saving safe, integrated level is high, install simple, easy to use, multiple functional, cost performance is high, it is worthy of popularization.

Accompanying drawing explanation

Fig. 1 is electrical principle block diagram of the present invention;

Fig. 2 is inventive shell cover plate installation diagram;

Fig. 3 is inventive shell base installation diagram;

Fig. 4 is implementing circuit figure of the present invention.

In figure, the model of integrated circuit used is: IC1: 78L12, IC2: LM393, IC3: CD4082.

Detailed description of the invention

The invention will be further described with embodiment below in conjunction with the accompanying drawings:

Seeing Fig. 1, main circuit latch-in relay normally opened contact is serially connected in centre, and main circuit is divided into power end and the main circuit load end of main circuit, and the break-make of latch-in relay is controlled by total control circuit, and Transformer Rectifier filter circuit is connected to main circuit power end.The sampling end of excess voltage protection and low-voltage protection circuit is connected to the outfan of Transformer Rectifier filter circuit; the sampling end of overcurrent, short-circuit protection circuit and leakage protection circuit is all connected to main circuit load end; the outfan of aforementioned four protection circuit all connects total control circuit; self-checking circuit one end is connected on main circuit load end and passes on the live wire of zero sequence current mutual inductor, and the self-checking circuit other end is connected on the zero line on main circuit power end.

Seeing Fig. 2, Fig. 3, the present invention is a kind of to integrate several functions and the Multifunction self-resetting formula over voltage protectors of energy saving such as stream, short-circuit protection, earth leakage protective and self-resetting type over-and under-voltage protection.It is mainly made up of the on and off switch on housing, housing, self-inspection button, display lamp, current transformer, zero sequence current mutual inductor, high-power latch-in relay, transformator, electric-controlled plate, main circuit line binding post.Its feature is: housing cover 1 is provided with on and off switch 6, self-inspection button 5, the wire of power supply indicator 4, two main circuit input terminals of 3, four malfunction indicator lamp are fixed in the wire of 2, two main circuit outlet terminals of screw fixes screw 7, housing base 8 and be provided with 9, two main circuit outlet terminals 15 of two main circuit input terminals, high-power latch-in relay 10, transformator 12, zero sequence current mutual inductor 14, current transformer 13 and electric-controlled plate 11, two groups of contact J of high-power latch-in relay 102-1And J2-2It is serially connected in respectively in the middle of the live wire of main circuit and in the middle of zero line.Panel was provided with stream, short-circuit protection circuit, leakage protection circuit, self-resetting type over voltage protection circuit.

Seeing Fig. 4, the circuit composition of the present embodiment is: excess voltage protection is by resistance R3、R5、R7、R8、R9、R10, adjustable resistance W2, diode D6, light emitting diode FD2, triode V1And voltage comparator ic2aConstitute, low-voltage protection electricity routing resistance R2、R4、R6、R11、R12、R13, adjustable resistance W1Diode D7, light emitting diode FD3, audion V2And voltage comparator ic2bConstituting, the sampling end of excess voltage protection and low-voltage protection circuit is all connected to the outfan of Transformer Rectifier filter circuit.Cross stream, short-circuit protection circuit by current transformer ZCT2, resistance R15、R16、R20、R21, adjustable resistance W4, electric capacity C7、C8, diode D10、D11, light emitting diode FD5With controllable silicon T2Constituting, the live wire of main circuit load end passes current transformer ZCT1, current transformer ZCT1Secondary ZCT1-1It was connected across the input of stream, short-circuit protection circuit.Leakage protection circuit is by zero sequence current mutual inductor ZCT2, resistance R14、R15, electric capacity C5、C6, adjustable resistance W3, diode D8、D9, light emitting diode FD4With controllable silicon T1Constituting, the live wire of main circuit load end and zero line are also cross zero sequence current mutual inductor ZCT2, zero sequence current mutual inductor ZCT2Secondary be connected across the input of leakage protection circuit.Total control circuit is by double 4 input AND gate circuit IC3, resistance R17、R18、R19, electric capacity C3、C4、C9, diode D5, audion V3, the first relay J1With the second relay J2High-power latch-in relay is constituted, the second relay J2Two groups of contact J2-1、J2-2It is serially connected in respectively in the middle of the live wire of main circuit and in the middle of zero line.The primary of mains transformer B is through on and off switch K1After be connected across in the middle of live wire and the zero line of main circuit power end, secondary is connected to current rectifying and wave filtering circuit, power supply indicator FD1Through current-limiting resistance R1After be connected across the outfan of Transformer Rectifier filter circuit, outfan one tunnel of current rectifying and wave filtering circuit is connected to the sampling end of voltage protection circuit and under-voltage protecting circuit, and a road is through three-terminal voltage-stabilizing IC circuit1Giving excess voltage protection, low-voltage protection circuit afterwards, cross stream, short-circuit protection circuit, leakage protection circuit, total control circuit offer working power, a road is through diode D5To the second relay J2Working power is provided.

When power turn-on switchs K1After, transformator B is energized work, low-voltage AC path diode D of B level output1—D4Rectification, electric capacity C1DC supply is provided to the present invention after filtering, in the case of main circuit power end is without overvoltage, under-voltage fault, voltage comparator ic2a3rd foot voltage is higher than the 2nd foot voltage, the 1st foot output high level, IC2b5th foot voltage is higher than the 6th foot voltage, and the 7th foot is output as high level, double 4 input AND gate circuit IC3Input the 2nd, the 5th foot are all high level, and the 3rd foot is because of controllable silicon T1Not turning on as high level, the 4th foot is also because of controllable silicon T2Do not turn on as high level, therefore IC3Outfan the 1st foot is high level, audion V3Turn on after time delay, relay J1Energising adhesive, J1Two groups of contact J1-1 and J1-2Conversion, J1-1Normally opened contact Guan Bi, delay capacitor C4Through resistance R19Repid discharge, for three adapter V next time3Delayed conducting prepare, J1-2Normally opened contact Guan Bi, electric current is through D5→J1-2Normally opened contact → J2→C9→ ground, makes the 3rd relay J2The transition status plus positive pulse, J2Two groups of contact J2-1And J2-2Closure state is converted to, at J by off-state2This closure state it is always maintained at before not adding negative pulse; the load end of main circuit is connected with power end; and the overvoltage fault starting to bring out main circuit power line carries out self-resetting type protection with under-voltage fault, overcurrent that main circuit load end occur, short trouble, leak current fault carry out open circuit protection.

Concrete circuit operation principle is as follows:

Overvoltage self-resetting type is protected: during power turn-on switch K1, such as main circuit power end (audion V before connecting load end3The effect of Delayed conducting) exist for overtension fault, the present invention by refusal to load end power transmission, after connecting operation such as main circuit power end with load end, overtension fault occurs, the present invention will cut off load end power supply immediately, to guarantee that main circuit load end electrical equipment does not burns out because of overtension, thus avoid electrical safety accident and the electrical fire accident caused because of overtension, after main circuit power terminal voltage is recovered normally, the load end of main circuit will be connected in 5S by the present invention automatically with power end, to guarantee normal electricity consumption, its operation principle is: when main circuit power voltage raises, transformator B secondary voltage also increases, through D1-D4, C1Voltage after rectifying and wave-filtering also and then raises, voltage comparator ic2a2nd foot voltage equally and then raises, and works as IC2aWhen 2nd foot voltage is higher than the 3rd foot voltage, IC2a1st foot output is become low level from high level, and first audion is become cut-off, overvoltage malfunction indicator lamp FD from conducting2Energising brightens, the most double 4 input AND gate circuit IC3Because the 2nd input pin is become low level by high level, the 1st output pin is also become low level by high level, such as the 3rd audion V3Power turn-on switch K1Time, main circuit load end and power end also access failure, then make V3It is continually maintained in cut-off state, such as the 3rd audion V3(main circuit load end and power end have been turned on running) the most in the conduction state, then make V3 be become cut-off state from conducting state immediately, the first relay J1Power-off discharges, J1Two groups of contact J1-1And J1-2Conversion, J1-1Normally-closed contact Guan Bi, by electric capacity C4Access the 3rd audion V3Base stage, for V next time3Delayed conducting is got ready, J1-2Normally-closed contact Guan Bi, electricity C9To the second relay J2Electric discharge, J2Because of negative pulse effect transition status, J2Two groups of contact J2-1And J2-2Being converted to off-state by closure state, main circuit load end and power end are cut off by the present invention immediately, change adjustable resistance W2Resistance, it is possible to adjust the setting value of main circuit overvoltage action, when main circuit voltage decline recover normal after, the output valve of Transformer Rectifier filter circuit declines recovery normally the most therewith, works as IC2a2nd foot voltage is less than after the 3rd foot voltage, and the 1st output pin is become high level, double 4 input AND gate circuit IC from low level3Input the 2nd foot is become high level from low level simultaneously, and the 3rd, the 4th, the 5th input pin is also high level originally, IC31st output pin is high level by low transition, the 3rd audion V3Because of electric capacity C4Charge and Delayed conducting, the first relay J1Energising adhesive, J1Two groups of contact J1-1And J1-2Conversion, J1-1Normally opened contact Guan Bi, make electric capacity C4Through resistance R19Electric discharge, J1-2Normally opened contact Guan Bi, make the second relay J2The transition status plus positive pulse, J2Two groups of normally opened contact J2-1And J2-2Be converted to closure state by off-state, the load end of main circuit is connected with power end.

Under-voltage self-resetting type is protected: close cell switch K1Time, as main circuit power end existed for under-voltage fault before connecting load end, the present invention by refusal to load end power transmission, as main circuit power end connects outlet under-voltage fault after operation with load end, the present invention will cut off load end power supply immediately, to guarantee that load end electrical equipment is not damaged because of brownout, after main circuit voltage recovers normally, main circuit load end will be connected, to guarantee normal electricity consumption in 5S by the present invention automatically with power end.Its operation principle is: when main circuit power terminal voltage reduces, transformer secondary output also decreases, through diode D1-D4, electric capacity C1Voltage after rectifying and wave-filtering also and then reduces, voltage comparator ic2b5th foot voltage equally and then reduces, and works as IC2bWhen 5th foot voltage is less than the 6th foot voltage, IC2b7th foot output is become low level from high level, the 2nd audion V2Cut-off, under-voltage malfunction indicator lamp FD is become from conducting3Energising brightens, the most double 4 input AND gate circuit IC3Input the 5th foot is transformed to low level by high level, and the 1st output pin is also become low level from high level, such as the 3rd audion V3The most also do not turn on, then make V3It is continually maintained in cut-off state, such as V3The most in the conduction state, then make V3Cut-off state is become, the first relay J from conducting state1Power-off discharges, the second relay J2Transition status, J because of negative pulse effect2Two groups of contact J2-1And J2-2Being converted to off-state by closure state, main circuit load end and power end are cut off by the present invention immediately, change adjustable resistance W1Resistance just can adjust the setting value of main circuit under-voltage action, when main circuit voltage rise return to normal after, IC2bThe 5th high 6th foot voltage of foot voltage, IC2b7th foot output is become high level from low level, IC32nd, 3,4 feet are also high level originally, IC31st output pin is become high level from low level, V3Delayed conducting, J1Energising adhesive, J2Because of the transition status plus positive pulse, J2Two groups of contact J2-1And J2-2Be converted to closure state by off-state, main circuit load end is connected with power end.

Overcurrent, short-circuit protection: after main circuit load end normal power-up is run; such as load end generation overcurrent, short trouble; load end and power end are cut off by the present invention immediately, with guarantee load end with electric line and electrical equipment not because of overcurrent, short trouble burn out, preventing electric fire.Its operation principle is: the current transformer ZCT when overcurrent or short trouble occurs in load end, on main circuit load end live wire1The faradic current produced also will correspondingly increase, and this electric current is through diode D10、D11, resistance R16、R20、R21, adjustable resistance W4, electric capacity C7、C8, trigger controllable silicon T2Conducting, T2Anode become low level by high level, cross stream, short trouble display lamp FD5Energising brightens, the most double 4 input AND gate circuit IC3Input the 4th foot is also become low level from high level, and outfan the 1st foot is become low level from high level, three adapter V3Cut-off, relay J is become from conducting1Power-off discharges, J2Because of negative pulse effect transition status, J2Two groups of contact J2-1And J2-2Being converted to off-state by closure state, main circuit load end and power end are cut off by the present invention immediately, change adjustable resistance W4Resistance just can adjust the setting value of main circuit load end overcurrent action.

Earth leakage protective: after main circuit load end normal power-up is run, leak current fault occur suddenly such as load end, the present invention will cut off main circuit load end power supply immediately, to ensure personal safety, prevents electrical grounding fire.Its operation principle is: when main circuit load end generation leak current fault, flow through through zero sequence current transformer ZCT2The electric current of two main circuit conductors will be uneven, ZCT2Secondary will produce faradic current, and the current differential that two main circuit conductors flow through is the biggest, ZCT2The faradic current produced is the biggest, when leakage current reaches the working value set, and ZCT2The secondary faradic current produced is through diode D8、D9, resistance R14、R15, adjustable resistance W3, electric capacity C5、C6Trigger controllable silicon T1Conducting, T1Anode become low level, leak current fault display lamp FD from high level4Energising brightens, the most double 4 input AND gate circuit IC3Input the 3rd foot is become low level by high level, and outfan the 1st foot is also become low level, audion V from high level3Cut-off, relay J is become from conducting1Power-off discharges, J2Because of negative pulse effect transition status, J2Two groups of contact J2-1And J2-2Being converted to off-state by closure state, main circuit load end and power end are cut off by the present invention immediately, change adjustable resistance W3Resistance just can adjust the setting value of main circuit load end leakage current action.

Claims (1)

1. a Multifunction self-resetting formula cross, under-voltage protector; main circuit is serially connected in centre by the normally opened contact of latch-in relay and is divided into the power end of main circuit and the load end of main circuit; and the switching of latch-in relay is controlled by total control circuit completely; the input of Transformer Rectifier filter circuit is connected to the power end of main circuit, and excess voltage protection and low-voltage protection circuit sampling end are connected to the outfan of Transformer Rectifier filter circuit;The sampling end of overcurrent, short-circuit protection circuit and leakage protection circuit is all connected to main circuit load end, and the outfan of above-mentioned excess voltage protection, low-voltage protection circuit, overcurrent, short-circuit protection circuit and leakage protection circuit is connected to total control circuit;Self-checking circuit one end is connected to main circuit load end and passes on the live wire of zero sequence current mutual inductor, and the self-checking circuit other end is connected on the zero line of main circuit power end;It is characterized in that; described excess voltage protection is made up of bleeder circuit, voltage comparator circuit and overvoltage failure indicating circuit; the input of bleeder circuit is connected to Transformer Rectifier filter circuit outfan; the outfan of bleeder circuit is connected to double 4 input AND gate circuit the 2nd input pins of total control circuit; double 4 input AND gate circuits control the break-make of the first relay; and the contact of the first relay controls the break-make of the second relay; second relay is latch-in relay, and its normally opened contact controls the break-make of main circuit;Described low-voltage protection circuit is made up of bleeder circuit, voltage comparator circuit and under-voltage failure indicating circuit; bleeder circuit one end is connected to Transformer Rectifier filter circuit outfan; carrying out under-voltage sampling, the bleeder circuit other end is connected on double 4 input AND gate circuit the 5th input pins of total control circuit;Described overcurrent, short-circuit protection circuit are connected and composed by current transformer, the second controllable silicon and diode, capacitance-resistance filter regulation circuit; current transformer is arranged on main circuit load end live wire; secondary transformer output is followed by the second SCR control pole through diode, capacitance-resistance filter regulation circuit, and the second controllable silicon anode is connected to double 4 input AND gate circuit the 4th input pins of total control circuit;Described leakage protection circuit is connected and composed by zero sequence current mutual inductor, the first controllable silicon and diode, capacitance-resistance filter regulation circuit; the live wire of main circuit load end and zero line are also cross zero sequence current mutual inductor; the output of zero sequence current mutual inductor secondary is followed by the first SCR control pole through diode, capacitance-resistance filter regulation circuit, and the first controllable silicon anode is connected to double 4 input AND gate circuit the 3rd input pins of total control circuit;Total control circuit is by double 4 input AND gate circuit and bleeder circuits, delay circuit, 3rd audion, first relay, second relay connects and composes, 4 inputs of double 4 input AND gate circuits are respectively connecting to excess voltage protection, low-voltage protection circuit, overcurrent, short-circuit protection circuit and the outfan of leakage protection circuit, the outfan of double 4 input AND gate circuits is through bleeder circuit, delay circuit is connected to the base stage of the 3rd audion, after 3rd audion and the series connection of the first relay, two ends are connected between anode and the negative terminal of Transformer Rectifier filter regulator circuit output power supply, and the second of the first relay group of contact directly controls the line bag power channel of the second relay.
CN201410132422.4A 2014-04-03 2014-04-03 Multifunction self-resetting formula is crossed, under-voltage protector CN103872658B (en)

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CN103872658B true CN103872658B (en) 2016-08-31

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105186445A (en) * 2015-08-20 2015-12-23 浙江凯发电气股份有限公司 Novel self-recovery type overvoltage-undervoltage protector circuit
CN105048406A (en) * 2015-08-20 2015-11-11 浙江凯发电气股份有限公司 Self-recovery overvoltage and undervoltage protector circuit
CN105958337A (en) * 2016-04-28 2016-09-21 湖南星球智能电气科技开发有限公司 Multi-functional distribution box
CN105978148B (en) * 2016-06-15 2019-03-22 湖南省奥能星科技有限公司 The domestic intelligent safe distribution of electric power system and its long-distance monitoring method that can remotely monitor
CN106602533A (en) * 2016-12-14 2017-04-26 安徽长龙电气集团有限公司 Overvoltage protection circuit used for power distribution cabinet
CN109445319A (en) * 2018-09-26 2019-03-08 电子科技大学 A kind of intelligent switch with Data Detection function

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CN102110971A (en) * 2009-12-23 2011-06-29 张斌 Intelligent protection controller for low-voltage distribution room
CN203850824U (en) * 2014-04-03 2014-09-24 湖南星球智能电气科技开发有限公司 Multifunctional self-recovery over-voltage and under-voltage protector

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CN101420116A (en) * 2008-12-04 2009-04-29 临安亿安电子有限公司 Intelligent integrated electricity leakage protection device
CN201402965Y (en) * 2009-04-28 2010-02-10 苏州工业园区新宏博通讯科技有限公司 Single-phase intelligent electricity utilization protecting device
CN102064515A (en) * 2009-11-16 2011-05-18 淳俅 Domestic intelligent electrical safe power distribution system
CN102110971A (en) * 2009-12-23 2011-06-29 张斌 Intelligent protection controller for low-voltage distribution room
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