CN205544225U - Electric current that lacks looks protection device lacks looks sensing switch circuit - Google Patents

Abstract

The utility model discloses an electric current that lacks looks protection device lacks looks sensing switch circuit, lack looks induction coil LGB, the scarce looks induction coil LGC of electric current, the scarce looks inductive switch LGKA of electric current, the scarce looks inductive switch LGKB of electric current, the scarce looks inductive switch LGKC of electric current, device output wiring column OUTN, install output wiring column OUTA, install output wiring column OUTB, install output wiring column OUTC, electric capacity C1, electric capacity C2 and electric capacity C3 including the scarce looks induction coil LGA of electric current, electric current, the utility model discloses utilizing electrical coil's electromagnetic characteristic and little magnetism on -state characteristic of tongue tube, directly will measuring the break -make both sexes that electric current process that transient range is very big converted to kai and closed, make the current induction switch element, use power consumption is little, and spare part is few, and is small, with low costs, is applicable to three -phase asynchronous motor's electric current open -phase protection.

Description

A kind of electric current phase shortage sensitive switch circuit of phase-lacking protective device

Technical field

This utility model relates to the running protection of threephase asynchronous and protects art with three-phase electric apparatus, refers in particular to the electric current phase shortage sensitive switch circuit of a kind of phase-lacking protective device.

Background technology

Threephase asynchronous model specification is a lot, and use face is extensively well-known.Owing to it is the electrical appliance that electric energy is converted into rotating mechanical energy, it is necessary to have the connection of power transmission line, unavoidable mechanical vibration；And transmission pressure, switch, catalyst, binding post etc. transmission of electricity joint portion, by reasons such as the humidity of nature, oxidation, dirt dyes, the factors such as improper matched by the mechanical vibration and the electric fuse that also have motor itself, cause single line fracture to produce and lack a phase current operational failure, and people are called electric current phase shortage；Also have a kind of situation to be that motor is near and around the most do not produce lead-in wire loop cracking phenomena, three-phase current loop is normal, but cause greatly motor phase failure to go on a long journey because remotely or more remotely having a phase power supply open circuit or wire contacts resistance to become, now all there is electric current in motor three-phase loop, simply electric current is the most uneven, voltage step is relatively big, and people are called voltage phase shortage；No matter it is voltage phase shortage, or electric current phase shortage, the acting that the load major part of motor is added on single phase winding, in several seconds that phase shortage starts, rotating speed successively decreases, owing to the reactance of the slack-off generation of rotating speed is less, electric current strengthens, and causes motor excessive heating to burn out winding and damage；People are in order to protect motor, it is to avoid unnecessary economic loss, usually give motor power input, add stream, electric leakage, open-phase protection measure；Current cross stream, electric leakage protection technology has basically reached Micro Energy Lose and has waited for the ideal standard of protection, but electric current phase shortage aspect is the most undesirable, be not protect the most complete; being exactly to apply single-piece many, volume is too big, and cost is high; and electric current open-phase protection runs power consumption too greatly, more than 20W at least.

Utility model content

In view of this; this utility model is for the disappearance of prior art existence; its main purpose is to provide the electric current phase shortage sensitive switch circuit of a kind of phase-lacking protective device, and it is bad that it can effectively solve its electric current open-phase protection of existing phase-lacking protective device, and open-phase protection runs the problem that power consumption is the biggest.

For achieving the above object, this utility model uses such as purgation technical scheme:

The electric current phase shortage sensitive switch circuit of a kind of phase-lacking protective device, includes electric current phase shortage induction coil LGA, electric current phase shortage induction coil LGB, electric current phase shortage induction coil LGC, electric current phase shortage inductive switch LGKA, electric current phase shortage inductive switch LGKB, electric current phase shortage inductive switch LGKC, device output wiring terminal OUTN, device output wiring terminal OUTA, device output wiring terminal OUTB, device output wiring terminal OUTC, electric capacity C1, electric capacity C2 and electric capacity C3；

Tripping coil LA rear end connects wire and passes electric leakage induction coil BO to electric current phase shortage induction coil LGA front end, end connection device output wiring terminal OUTA after electric current phase shortage induction coil LGA；Tripping coil LB rear end connects wire and passes electric leakage induction coil BO to electric current phase shortage induction coil LGB front end, end connection device output wiring terminal OUTB after electric current phase shortage induction coil LGB；Tripping coil LC rear end connects wire and passes electric leakage induction coil BO to electric current phase shortage induction coil LGC front end, end connection device output wiring terminal OUTC after electric current phase shortage induction coil LGC；After electric current phase shortage inductive switch LGKA, electric current phase shortage inductive switch LGKB, electric current phase shortage inductive switch LGKC are in parallel with electric capacity C1, electric capacity C2, electric capacity C3 respectively, be arbitrarily together in series two ends of formation by electric current phase shortage inductive switch LGKA, electric current phase shortage inductive switch LGKB, electric current phase shortage inductive switch LGKC.

As a kind of preferred version, described electric capacity C1, electric capacity C2, electric capacity C3 are buffering electric capacity.

This utility model compared with prior art has clear advantage and beneficial effect, specifically, as shown from the above technical solution:

This utility model uses the power on the electromagnetic property of coil and micro-magnetic on state characteristic of tongue tube; directly current course the biggest for quantitative change scope is converted into the break-make both sexes of Push And Release; make electric current inductive switch unit; use power consumption is little; parts are few; volume is little, low cost, it is adaptable to the electric current open-phase protection of threephase asynchronous.

For more clearly illustrating architectural feature of the present utility model and effect, with specific embodiment, this utility model is described in detail below in conjunction with the accompanying drawings.

Accompanying drawing explanation

Fig. 1 is the structural representation of the preferred embodiment of this utility model；

Fig. 2 be this utility model preferred embodiment in the enlarged diagram of electric current phase shortage sensitive switch circuit；

Fig. 3 be this utility model preferred embodiment in the enlarged diagram of voltage phase shortage sensitive switch circuit.

Detailed description of the invention

nullRefer to shown in Fig. 1 to Fig. 3，That show the concrete structure of the preferred embodiment of this utility model，Include alternating current power supply lead-in clamp INN、Alternating current power supply lead-in clamp INA、Alternating current power supply lead-in clamp INB、Alternating current power supply lead-in clamp INC、Trip switch KA、Trip switch KB、Trip switch KC、Tripping coil LA、Tripping coil LB、Tripping coil LC and tripping coil LT、Trip link TA、Trip link TB、Trip link TC and trip link T、Electric leakage induction coil BO、Electric current phase shortage induction coil LGA、Electric current phase shortage induction coil LGB、Electric current phase shortage induction coil LGC、Electric current phase shortage inductive switch LGKA、Electric current phase shortage inductive switch LGKB、Electric current phase shortage inductive switch LGKC、Device output wiring terminal OUTN、Device output wiring terminal OUTA、Device output wiring terminal OUTB、Device output wiring terminal OUTC、Leak(age) test switch AN、Leak(age) test current-limiting resistance RN、Positive temperature coefficient resistance RA、Positive temperature coefficient resistance RB、Positive temperature coefficient resistance RC、Resistance R1、Resistance R2、Resistance R3、Resistance R4、Resistance R5、Resistance R6、Resistance R7、Resistance R8、Resistance R9、Resistance R10、Resistance R11、Resistance R12、Resistance R13、Resistance R14、Electric capacity C1、Electric capacity C2、Electric capacity C3、Electric capacity C4、Electric capacity C5、Electric capacity C6、Electric capacity C7、Electric capacity C8、Electric capacity C9、Electric capacity C10、Electric capacity C11、Electric capacity C12、Electric capacity C13、Electric capacity C14、Diode D1、Diode D2、Diode D3、Diode D4、Diode D5、Diode D6、Diode D7、Diode D8、Diode D9、Diode D10、Photoelectric coupling electronics amplification integrated block IC A、Photoelectric coupling electronics amplification integrated block IC B、Photoelectric coupling electronics amplification integrated block IC C、Two trigger pipe B1、Two trigger pipe B2、Two trigger pipe B3、Trigger pipe B4、Three trigger pipe B5、Stabilivolt W1、Stabilivolt W2、Stabilivolt W3、Controllable silicon CR、Midget relay DJ、Field effect transistor 4N90.

Alternating current power supply lead-in clamp INN is directly by going between through electric leakage induction coil BO to device output wiring terminal OUTN；Alternating current power supply lead-in clamp INA connects trip switch KA front end, trip switch KA rear end connects tripping coil LA front end, tripping coil LA rear end connects wire and passes electric leakage induction coil BO to electric current phase shortage induction coil LGA front end, end connection device output wiring terminal OUTA after electric current phase shortage induction coil LGA；Alternating current power supply lead-in clamp INB connects trip switch KB front end, trip switch KB rear end connects tripping coil LB front end, tripping coil LB rear end connects wire and passes electric leakage induction coil BO to electric current phase shortage induction coil LGB front end, end connection device output wiring terminal OUTB after electric current phase shortage induction coil LGB；Alternating current power supply lead-in clamp INC connects trip switch KC front end, trip switch KC rear end connects tripping coil LC front end, tripping coil LC rear end connects wire and passes electric leakage induction coil BO to electric current phase shortage induction coil LGC front end, end connection device output wiring terminal OUTC after electric current phase shortage induction coil LGC；After electric current phase shortage inductive switch LGKA, electric current phase shortage inductive switch LGKB, electric current phase shortage inductive switch LGKC are in parallel with electric capacity C1, electric capacity C2, electric capacity C3 respectively, arbitrarily electric current phase shortage inductive switch LGKA, electric current phase shortage inductive switch LGKB, electric current phase shortage inductive switch LGKC are together in series and form two ends, after in this two ends parallel connection, electric current phase shortage selects switch XK, one end connects mainboard voltage phase shortage sensitive switch outfan XI, and the other end connects on motherboard power supply negative terminal BG line；Leak(age) test button AN mono-end connection device output wiring terminal OUTB, the leak(age) test button AN other end connects leak(age) test current-limiting resistance RN one end, and the leak(age) test current-limiting resistance RN other end is connected to tripping coil LC rear end；Device mainboard three phase mains wiring point ZA, ZB, ZC connect electric current phase shortage induction coil LGA, LGB, LGC front end respectively, connect positive temperature coefficient resistance RA, RB, RC one end the most respectively, positive temperature coefficient resistance RA, RB, RC other end connects three-phase commutation bridge ac input end CA, CB, CC of diode D4, D5, D6, D7, D8, D9 composition respectively, three-phase commutation bridge positive voltage output end connects potential point BA, and its negative voltage outfan connects potential point BG.

The former limit of voltage phase shortage inductive switch, phase A road starts to connect the anode of diode D1 from exchange point CA, the negative terminal of diode D1 connects resistance R1 one end, the resistance R1 other end connects electric capacity C7 one end, the electric capacity C7 other end is in parallel with the resistance R4 other end to be connected with exchange point CB, resistance R4 one end is connected with the other end of two triggering pipe B1 of concatenation, one end of two triggering pipe B1 of concatenation is connected with the negative terminal of the light emitting diode on the former limit of photoelectric coupling electronics amplification integrated block IC A, the anode of the light emitting diode on the former limit of photoelectric coupling electronics amplification integrated block IC A connects the resistance R1 other end, and be connected with electric capacity C7 one end.

The former limit of voltage phase shortage inductive switch, phase B road starts to connect the anode of diode D2 from exchange point CB, the negative terminal of diode D2 connects resistance R2 one end, the resistance R2 other end connects electric capacity C8 one end, the electric capacity C8 other end is in parallel with the resistance R5 other end to be connected with exchange point CC, resistance R5 one end is connected with the other end of two triggering pipe B2 of concatenation, one end of two triggering pipe B2 of concatenation is connected with the negative terminal of the light emitting diode on the former limit of photoelectric coupling electronics amplification integrated block IC B, the anode of the light emitting diode on the former limit of photoelectric coupling electronics amplification integrated block IC B connects the resistance R2 other end, and be connected with electric capacity C8 one end.

The former limit of voltage phase shortage inductive switch, phase C road starts to connect the anode of diode D3 from exchange point CC, the negative terminal of diode D3 connects resistance R3 one end, the resistance R3 other end connects electric capacity C9 one end, the electric capacity C9 other end is in parallel with the resistance R6 other end to be connected with exchange point CA, resistance R6 one end is connected with the other end of two triggering pipe B3 of concatenation, one end of two triggering pipe B3 of concatenation is connected with the negative terminal of the light emitting diode on the former limit of photoelectric coupling electronics amplification integrated block IC C, the anode of the light emitting diode on the former limit of photoelectric coupling electronics amplification integrated block IC C connects the resistance R3 other end, and be connected with electric capacity C9 one end.

The mutually annular series connection of phase A, phase B, tri-former limits of symmetrical voltage phase shortage inductive switch of phase C, starting point is connected with alternating current pressure point CA, CB, CC respectively, defines loop, phase of three-phase voltage inductive switch former limit；nullSecondary collector and emitter by photoelectric coupling electronics amplification integrated block IC A、The secondary collector and emitter of photoelectric coupling electronics amplification integrated block IC B、The upper electric capacity C4 of the secondary collector and emitter of photoelectric coupling electronics amplification integrated block IC C parallel connection respectively、Electric capacity C5、Electric capacity C6 also complies with the sense of current successively and connects into closed loop circuit，A point is arbitrarily disconnected in three points，Define a colelctor electrode input and another emitter stage outfan，Colelctor electrode input connects the negative terminal of stabilivolt W1，Emitter stage outfan XI connects electric current phase shortage sensitive switch LGKA one end，Tripping coil LT one end connects the negative electrode of diode D10、Motherboard power supply positive pole BA、One end of the triggering pipe B5 of three concatenations，The tripping coil LT other end connects the anode of diode D10、One end of resistance R7、The drain electrode of field effect transistor 4N90，The other end of resistance R7 connects the one end triggering pipe B4、The anode of controllable silicon CR、One end of the normally opened contact DJK of relay DJ、One end of electric capacity C10、One end of resistance R8、The power end of stabilivolt W1，The other end of electric capacity C10 and the other end of resistance R8 connect on power supply BG line，The other end of the normally opened contact DJK of relay DJ connects on triggering signal point BH，Relay DJ coil two ends connect mainboard external control signal input wires point JI、JO，Trigger the other end of pipe B4、The other end of resistance R9、The negative electrode of controllable silicon CR、The other end of resistance R14、The other end of electric capacity C14 meets on triggering signal point BH with one end of resistance R10；nullOne end of resistance R9 connects the other end of three triggering pipe B5 being serially connected，One end of electric capacity C14 connects the other end and the control pole of controllable silicon CR of resistance R13，One end of resistance R13 connects the other end and one end of electric capacity C13 of resistance R12，One end of resistance R12 connects the negative electrode of stabilivolt W3、Electric capacity C12 one end and electric leakage induction coil B0 access point RI，One end of the anode of stabilivolt W3 and resistance R14 and electric capacity C12、The electric capacity C13 other end meets at electric leakage induction coil access point RG，The resistance R10 other end connects the grid of field effect transistor 4N90、The negative electrode of stabilivolt W2、One end of electric capacity C11 and one end of resistance R11，The source electrode of field effect transistor 4N90、The anode of stabilivolt W2、The other end of electric capacity C11 and the other end of resistance R11 meet on power supply BG line.

In the present embodiment, electric current phase shortage sensitive switch is as a example by phase A, electric current phase shortage induction coil LGA/ electric current phase shortage inductive switch LGKA is with the short cylinder of plastics of diameter 12MM, enclose around the thickest upper enamel-covered wire 11, the normally opened contact tongue tube using high sensitive magnetic connects lead-in wire, insert after carrying out insulation in the coil hole wound, as long as electric current just closes connection at more than 0.6A, tongue tube normally opened contact in coil current phase shortage induction coil LGA；Voltage phase shortage inductive switch is as a example by phase A, use two 210V high pressure to trigger pipe series connection and form a 420V voltage gating element and the rectification of diode D1, utilize the electric light electric isolution amplification characteristic of photoelectric coupling electronics amplification integrated block IC A, it is that 3.3M Ω makees current limliting by resistance R1 value, resistance R4 makees to trigger buffering current limliting, integration energy storage is made with electric capacity C7, current buffering is made with electric capacity C4, (being equivalent to alternating voltage 300V) conducting when two triggering pipe B1 both end voltage of series connection are more than 420V, conducting after current road is luminous through the former limit light emitting diode of photoelectric coupling amplification integrated block IC A, the phototriode causing photoelectric coupling amplification integrated block IC A secondary turns on；Make three parts of symmetrical voltage gated optical electric coupling electrical switches and three parts of symmetrical electric current gating electromagnetic induction switch after this manner, two ends are formed after they are complied with sense of current series connection, and give six relatively independent electric drive switch in parallel same capacitor, electric current road is when they these series connection groups, owing to each switch motion timing node is different, electric current presents eddy current roller to be passed through, as long as there being a switch obstructed, current path is the most cut-off；Resistance R7 is that mainboard is to electric leakage, phase shortage, under-voltage, the source current limiting resistance of outer control function setting, value selects 22M Ω resistance, it is about 30uA by electric current, i.e. meets the integration needs triggering circuit, meets again the small area analysis working condition of phase shortage sensitive switch group；Electric capacity C7 is storage capacitor；Stabilivolt W1 is to set up the preferred power supply that electric leakage triggers with outer control, and selecting voltage stabilizing value is 36V, it is ensured that the power supply that electric leakage at any time and outer control trigger needs；Relay DJ is that extraneous signal controls input and buffer action；Resistance R8 is time-delay reset resistance, and value selects 44M Ω；One-way SCR CR is by leakage trigger electrical switch, produces electric leakage secondary and drives electric current；The circuit that electric capacity C12, electric capacity C13, electric capacity C14, resistance R12, resistance R13, resistance R14 and stabilivolt W3 are formed is electric leakage signal input threshold and Anti-Jamming；Triggering pipe B4 is default phase signal or under-voltage signal lag driving triggering pipe, and working value selects 90V；Three are triggered pipe B5 is that supervoltage draws trigger action, triggers pipe series connection with three 240V high pressure and forms 720V voltage gating characteristics;Resistance R9, resistance R10 are current-limiting resistance;Resistance R11 electric capacity C11 is stability maintenance time-lag action, it is ensured that the electrical switch that is triggered normally works;Stabilivolt W2 is that 20V field effect transistor inputs voltage-limiting protection；Field effect transistor 4N90 is that voltage drives power electronic switching；Diode D10 is weakening effect；Tripping coil LT is the comprehensive dropout electromagnetic conversion mechanical energy assembly such as electric leakage, phase shortage, superpressure, under-voltage, external signal control；Tripping coil LA, tripping coil LB, tripping coil LC are that corresponding phase current exceeds the quata to determine dropout electromagnetic conversion mechanical energy assembly；Electric leakage induction coil BO be obtain electrical leakage quantity be the effect of signal；Diode D4, diode D5, diode D6, diode D7, diode D8, diode D9 are for completing three-phase or single-phase rectifier work；Positive temperature coefficient resistor RA, positive temperature coefficient resistor RB, positive temperature coefficient resistor RC are for producing self protective function resistance.

Three-phase or single-phase power rectifier unit is formed by diode D4, diode D5, diode D6, diode D7, diode D8, diode D9；Carry out three phase mains rectification when three-phase CA, CB, CC terminal voltage is normal, carry out single-phase rectifier when three-phase CA, CB, CC terminal voltage has a phase terminal voltage too low.

Formed, with field effect transistor 4N90 and tripping coil LT, the driving that is triggered with electric capacity C11 and stabilivolt W2 by resistance R10, resistance R11 and control trip unit.When signaling point BH inputs enough driving voltages; electric current buffers through resistance R10 and charges to electric capacity C11; it is limited in 20V by stabilivolt W2; and discharge through resistance R11 time delay; field effect transistor 4N90 is driven and is turned on simultaneously; power supply BA anode is crossed field effect transistor 4N90 by tripping coil LT and is formed electric current to power supply negative terminal, and tripping coil LT converts electric energy to electromagnetic and mechanical can drive trip switch deenergization, produces protection act.

Triggered pipe B5 and resistance R9 by three and form supervoltage trigger element；When power supply BA to BG voltage is more than 720V, three are triggered pipe B5 and turn on rapidly, and power supply BA crosses resistance R3 to BH through three triggering pipe B5 and produces current signal, and making to be triggered drives control trip unit to complete protection work of threading off.

Phase shortage Time-delayed trigger unit is formed by resistance R7 and triggering pipe B4 and electric capacity C10 and stabilivolt W1 and the voltage phase shortage connected thereof and electric current phase shortage inductive switch series connection group；When in stabilivolt W1 electric current because when electric current phase shortage or voltage phase shortage and under-voltage cut-off; electric capacity C7 is constantly charged by the electric current through resistance R7; within about 3 seconds, BC point voltage rises to 90V from 36V+, triggers pipe B4 and is triggered and turns on, and making to be triggered drives control trip unit to complete protection work of threading off.

Leakage trigger unit is formed with resistance R12, resistance R13, resistance R14 with stabilivolt W3 and electric leakage induction coil BO by controllable silicon CR and electric capacity C12, electric capacity C13, electric capacity C14；When leakage current is equal to or more than setting value; controllable silicon CR is triggered by electric leakage induction coil BO faradic current through the thresholding being made up of with stabilivolt W3 with resistance R12, resistance R13, resistance R14 electric capacity C12, electric capacity C13, electric capacity C14; the 36V+ electric energy that electric capacity C10 two ends keep is discharged to BH through controllable silicon CR and produces current signal, and making to be triggered drives control trip unit to complete protection work of threading off.

Leakage function test unit is formed by leak(age) test switch AN and leak(age) test current-limiting resistance RN；When leak(age) test switch AN connects; phase B goes between in the middle of electric leakage induction coil BO from trip switch KB to tripping coil LB rear end; overcurrent phase shortage induction coil LGB switchs AN to leak(age) test; cross leak(age) test current-limiting resistance RN to tripping coil LC and cross trip switch KC connection phase C; visible current loop single line passes in the middle of electric leakage induction coil BO; the alternating magnetic field causing electric leakage induction coil BO is uneven; induce electric leakage signal; causing creepage protection function circuit to carry out dropout protection act, creepage protection function is detected.

Switch K is connected in parallel on three-phase current phase shortage inductive switch series connection group two ends formation electric current phase shortage and is turned on and off functional unit；When switching K Guan Bi, three-phase current phase shortage inductive switch is shorted inefficacy, and when contrary switch K disconnects, switch is considered as losing efficacy, three-phase current phase shortage inductive switch functional rehabilitation.

Formed earth leakage protective by resistance R7 and electric capacity C10 and stabilivolt W1 and extraneous signal controls input preferred power supply unit；When stabilivolt W1 anode tap is equal to 0V to the voltage of power supply BG line, because stabilivolt characteristic maintains the voltage 36V of voltage stabilizing value, remain that earth leakage protective and extraneous signal control the triggering power supply of input.

Phase of three-phase voltage sensitive switch unit is formed by diode D1, diode D2, diode D3, two triggering pipe B1, two triggering pipe B2, two triggering pipe B3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, photoelectric coupling electronics amplification integrated block IC A, photoelectric coupling electronics amplification integrated block IC B, photoelectric coupling electronics amplification integrated block IC C, electric capacity C4, electric capacity C5, electric capacity C6；When the relative alternating voltage of mainboard three-phase alternating current pressure point CA, CB, CC is more than 300V to 380V, three-phase voltage sensitive switch reaches DC voltage be triggered conducting more than 420V to 540V because triggering pipe two ends, photoelectric coupling electronics amplifier integrated block former limit diode is by short duration current that the cycle is 50 milliseconds to 2 seconds, secondary phototriode produces the burst pulse conducting phase accordingly, stabilivolt W1 series loop current is pulsed through, BC point voltage fluctuates, but less than 90V, triggers pipe B4 and remain waiting for；When the relative alternating voltage of mainboard three-phase alternating current pressure point CA, CB, CC is less than 300V; cause wherein a phase or biphase voltage sensor switch because of trigger pipe two ends do not reach DC voltage 420V fail trigger and obstructed; photoelectric coupling secondary phototriode is caused to end; stabilivolt W1 series loop current is zero; BC point voltage rises to 90V; electric energy on electric capacity C10 produces trigger current signal by triggering pipe B4 to BH, and making to be triggered drives control trip unit to complete protection work of threading off.

Three-phase current phase shortage sensitive switch unit is constituted by electric current phase shortage induction coil LGA, electric current phase shortage induction coil LGB, electric current phase shortage induction coil LGC, electric current phase shortage electric current sense switch LGKA, electric current phase shortage electric current sense switch LGKB, electric current phase shortage electric current sense switch LGKC, electric capacity C1, electric capacity C2, electric capacity C3；Electric current phase shortage electric current sense switch LGKA, electric current phase shortage electric current sense switch LGKB, electric current phase shortage electric current sense switch LGKC are tongue tube, when three-phase current is all higher than more than 0.6A, three-phase tongue tube all interval Guan Bi or long secondary closure, stabilivolt W1 series loop current is pulsed through, BC point voltage fluctuates, but less than 90V, trigger pipe B4 and remain waiting for；When in three-phase current phase shortage inductive switch, arbitrary phase current is less than 0.6A; this phase tongue tube will can not close and open a way for a long time; causing stabilivolt W1 series loop current is zero; BC point voltage rises; about cross 3 seconds BC point voltages and rise to 90V; triggering pipe B4 to be triggered and turn on, the electric energy on electric capacity C10 produces current signal by triggering pipe B4 to BH, and making to be triggered drives control trip unit to complete protection work of threading off.

In the present embodiment, in order to cost-effective, high pressure can be triggered effective low pressure triggering pipe and replace:

1, triggering pipe B4=90V, by three DB3 (low pressure triggers pipe) series connection offspring's use, magnitude of voltage is 99V.

2, triggering pipe B1*2=B2*2=B3*3=420V, replace with 12 DB3 series connection, magnitude of voltage is 396V.

3, triggering pipe B5*3=720V, replace with 22 DB3 series connection, magnitude of voltage is 726V.

The above, it it is only preferred embodiment of the present utility model, not technical scope of the present utility model is imposed any restrictions, therefore every any trickle amendment, equivalent variations and modification above example made according to technical spirit of the present utility model, all still fall within the range of technical solutions of the utility model.

Claims (2)

1. the electric current phase shortage sensitive switch circuit of a phase-lacking protective device, it is characterised in that: include electric current phase shortage induction coil LGA, electric current phase shortage induction coil LGB, electric current phase shortage induction coil LGC, electric current phase shortage inductive switch LGKA, electric current phase shortage inductive switch LGKB, electric current phase shortage inductive switch LGKC, device output wiring terminal OUTN, device output wiring terminal OUTA, device output wiring terminal OUTB, device output wiring terminal OUTC, electric capacity C1, electric capacity C2 and electric capacity C3；

Tripping coil LA rear end connects wire and passes electric leakage induction coil BO to electric current phase shortage induction coil LGA front end, end connection device output wiring terminal OUTA after electric current phase shortage induction coil LGA；Tripping coil LB rear end connects wire and passes electric leakage induction coil BO to electric current phase shortage induction coil LGB front end, end connection device output wiring terminal OUTB after electric current phase shortage induction coil LGB；Tripping coil LC rear end connects wire and passes electric leakage induction coil BO to electric current phase shortage induction coil LGC front end, end connection device output wiring terminal OUTC after electric current phase shortage induction coil LGC；After electric current phase shortage inductive switch LGKA, electric current phase shortage inductive switch LGKB, electric current phase shortage inductive switch LGKC are in parallel with electric capacity C1, electric capacity C2, electric capacity C3 respectively, be arbitrarily together in series two ends of formation by electric current phase shortage inductive switch LGKA, electric current phase shortage inductive switch LGKB, electric current phase shortage inductive switch LGKC.

The electric current phase shortage sensitive switch circuit of a kind of phase-lacking protective device the most according to claim 1, it is characterised in that: described electric capacity C1, electric capacity C2, electric capacity C3 are buffering electric capacity.