CN201797296U

CN201797296U - Multifunctional intelligent earth leakage circuit breaker

Info

Publication number: CN201797296U
Application number: CN201020295211XU
Authority: CN
Inventors: 颜福随
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-13
Filing date: 2010-08-13
Publication date: 2011-04-13
Anticipated expiration: 2020-08-13

Abstract

The utility model relates to a multifunctional intelligent earth leakage circuit breaker which comprises a leakage detection circuit, a leakage zero sequence mutual inductor, a self diagnosis current, a central control unit, a memory circuit and an undervoltage, overcurrent, open phase and zero breaking detection circuit, wherein the leakage zero sequence mutual inductor and the self diagnosis current are connected with a leakage current signal input end of the leakage detection circuit, the central control unit is connected with a leakage current signal output end of the leakage detection circuit, the memory circuit which is connected with the central control unit and is used for recording the total switching-on times, the automatic switching-on times and the leakage action times, and the undervoltage, overcurrent, open phase and zero breaking detection circuit is connected with the central control unit. The earth leakage circuit breaker has the functions of rated leakage current adjusting, open phase protecting, undervoltage protecting, overvoltage protecting, overcurrent protecting, short circuit protecting, zero breaking protecting, break time adjusting, vector quantity protecting, self diagnosing and automatic reclosing, memorizing and remote auxiliary controlling.

Description

The multifunctional intellectual residual current circuit breaker

Technical field

The utility model relates to the technical field of intelligent residual current circuit breaker, specifically is a kind of multifunctional intellectual residual current circuit breaker.

Background technology

The main effect of residual current circuit breaker of the prior art is earth leakage protective and overload protection etc.; it does not have automatic reclosing, memory function, under-voltage protection, overvoltage protection, open-phase protection, disconnected zero protection and self-diagnostic function; and there is the dead band in detection of electrical leakage; can not be to residual current from motion tracking; so the function of existing residual current circuit breaker is more single, can not satisfy the demand of practical application.

In the three-phase line four-wire system electrical network, each load is the phase place connection, if zero main line fracture, the zero line current potential will take place cheaply, and then civilian electric 220 volts can be elevated to 380 volts suddenly, or drop to tens volts suddenly.No matter voltage raises and reduces, this all can burn out a big class or a large stretch of power consumption equipment, and may cause appliance fire, brings serious loss to the country and people.

The utility model content

Technical problem to be solved in the utility model provides a kind of have under-voltage, overvoltage, phase shortage, disconnected zero defencive function, automatic reclosing function, memory function, the multifunctional intellectual residual current circuit breaker of self-diagnostic function and the automatic following function of residual current.

For solving the problems of the technologies described above, the utility model provides a kind of multifunctional intellectual residual current circuit breaker, comprise: electric-leakage detection circuit, the electric leakage zero-sequence transformer and the self-diagnostic circuit that link to each other with the leakage current signal input part of electric-leakage detection circuit, the central control unit that links to each other with the electric leakage signal output of electric-leakage detection circuit, being used to of linking to each other with central control unit write down the memory circuit of total combined floodgate number of times, automatic closing number of times and electric leakage action frequency, under-voltage, the overcurrent that links to each other with central control unit, phase shortage, disconnected zero testing circuit.

The utlity model has positive effect: (1) multifunctional intellectual residual current circuit breaker of the present utility model has: specified leakage current is adjustable, open-phase protection, under-voltage protection, overvoltage protection, overcurrent protection, short-circuit protection, disconnected zero protection, memory function and long-range ancillary control function; Have also that break-time is adjustable, vector protection, self diagnosis and automatic reclosing function.Automatic reclosing is the effective anti-accident measures that is applied in overhead wire transmission of electricity and the overhead wire supply line, promptly after circuit breaks down, relaying protection makes circuit breaker trip, circuit breaker is closed again.In most cases, line fault (as thunderbolt, windburn etc.) is temporary, and the insulation property of circuit behind the circuit breaker trip (insulator and air gap) can be restored, and overlapping once more can be successful, and this has just improved the reliability of power system power supply.A few cases belongs to permanent fault, and tripping is again moved by relaying protection in auto recloser action back, ascertains the reason, and is got rid of and send.Generally speaking, line fault tripping operation back reclosing is fast more, and effect is good more.Be 0.15～0.5 second the shortest blanking time that reclosing allows.The circuit rated voltage is high more, and the insulation deionization time is long more.The success rate of automatic reclosing changes according to line construction, electric pressure, meteorological condition, major failure type etc. and decides.According to the China Power department statistics, generally can reach 60%～90%.The anti-accident measures of the another kind of extensive use of electricity consumption department is that stand-by power supply drops into automatically, and required time is 0.2～0.5 second usually.Its required investment is few and to keep the economic benefit that normal power supply brings very big.(2) multifunctional intellectual residual current circuit breaker of the present utility model has disconnected zero defencive function, in case circuit occurs breaking zero, it can close high pressure automatically in disconnected zero back 20ms and low-voltage circuit is imported, and guarantees power consumption equipment safety, can prevent that disconnected zero sends out accident mutually.

Description of drawings

For the easier quilt of content of the present utility model is clearly understood, below the specific embodiment and in conjunction with the accompanying drawings of basis, the utility model is described in further detail, wherein:

Fig. 1 is the circuit block diagram of the multifunctional intellectual residual current circuit breaker of embodiment 1;

Fig. 2 is first's electrical schematic diagram of above-mentioned multifunctional intellectual residual current circuit breaker;

Fig. 3 is the second portion electrical schematic diagram of above-mentioned multifunctional intellectual residual current circuit breaker;

Fig. 4 is the third part electrical schematic diagram of above-mentioned multifunctional intellectual residual current circuit breaker.

Embodiment

See Fig. 1-4, the multifunctional intellectual residual current circuit breaker of present embodiment comprises: electric-leakage detection circuit, the electric leakage zero-sequence transformer LH and the self-diagnostic circuit that link to each other with the leakage current signal input part of electric-leakage detection circuit, the central control unit that links to each other with the electric leakage signal output of electric-leakage detection circuit, what link to each other with central control unit is used to write down total combined floodgate number of times, the memory circuit of automatic closing number of times and electric leakage action frequency, what link to each other with central control unit is under-voltage, overcurrent, phase shortage, disconnected zero testing circuit (comprises operational amplifier U1A, U1B, U1C, U2B, U2C and U2D and peripheral auxiliary element thereof).

Described central control unit also is connected with electronic sub-gate control circuit, and electronic sub-gate control circuit is connected with and is suitable for controlling the incoming call combined floodgate outage separating brake accumulator (comprising capacitor C 18 and C19) that electronic sub-gate control circuit closed a floodgate, controlled when cutting off the power supply electronic sub-gate control circuit separating brake when incoming call.Central control unit also is connected with leakage current display circuit, DIP switch circuit and is used to realize the long-range divide-shut brake supervisory circuit of long-range divide-shut brake control and divide-shut brake signal output function (comprise optocoupler OPT1 and OPT2, reach relevant auxiliary element).

See Fig. 2-4, it is the single-chip microcomputer of 16C72A that central control unit adopts model, and wherein, RB0 is that electric leakage signal input, RA1 are the dropout control ends that is used to control electronic sub-gate control circuit action.It is the chip of 93LC56A that memory circuit adopts model.Self-diagnostic circuit comprises the leakage tests button SW1 that is connected on the electric leakage zero-sequence transformer LH.Electric-leakage detection circuit comprises operational amplifier U3A and peripheral auxiliary element thereof.Electronic sub-gate control circuit comprises that motor M 1 reaches by monolithic processor controlled power driving circuit.

The leakage current display circuit comprises three charactron T5-T7 that link to each other with single-chip microcomputer.

The pin RB3 of single-chip microcomputer links to each other with DIP switch (dual inline type DIP switch) JP7, JP8 respectively with RB6, when DIP switch JP7, JP8 are closed, can realize the automatic following function of residual current.

The pin RB1 and the RB2 of single-chip microcomputer are connected with DIP switch JP5 and JP6 respectively, when DIP switch JP7, JP8 JP5 and JP6 are closed, can realize memory function.In addition, when DIP switch JP4, JP5 and JP7 are closed, can realize vector defencive function (promptly realizing the function in the no dead band of electric leakage).

The specified electric leakage residual current of multifunctional intellectual residual current circuit breaker of the present utility model is divided into: 100mA, 300mA, 500mA, 1000mA, gradual 400mA, sudden change 50mA, gradual 300mA, sudden change 75mA, and have residual current from motion tracking and the automatic pursuit gain adjustable function of demonstration residual current.

The specified electric leakage residual current of residual current circuit breaker was sudden change 50mA, gradual 300mA when wherein, switch JP3 was closed; In addition, switch JP3 and JP1 closure are gradual 300mA, sudden change 75mA, and switch JP1 closure is 500mA, and switch JP2 closure is 1000mA, and switch JP3 and JP2 closure are 100mA, and switch JP3, JP1 and JP2 are broken as 300mA, and JP4 is closed to be withdrawed from for leaking electricity.

The electric leakage break-time of residual current circuit breaker of the present utility model is adjustable, and when JP5 and JP6 are broken as 0.2S, JP5 and JP6 closure are 1S, and the JP5 closure is 0.3S, and the JP6 closure is 0.5S.

The foregoing description only is for the utility model example clearly is described, and is not to be qualification to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all execution modes.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection range of the present utility model.

Claims

1. multifunctional intellectual residual current circuit breaker, comprise: electric-leakage detection circuit, the electric leakage zero-sequence transformer and the self-diagnostic circuit that link to each other with the leakage current signal input part of electric-leakage detection circuit, the central control unit that links to each other with the electric leakage signal output of electric-leakage detection circuit, being used to of linking to each other with central control unit write down total combined floodgate number of times, automatic closing number of times and electric leakage action frequency memory circuit, under-voltage, the overcurrent that links to each other with central control unit, phase shortage, disconnected zero testing circuit.

2. multifunctional intellectual residual current circuit breaker according to claim 1, it is characterized in that: described central control unit also is connected with electronic sub-gate control circuit, and electronic sub-gate control circuit is connected with and is suitable for controlling the incoming call combined floodgate outage separating brake accumulator that electronic sub-gate control circuit closed a floodgate, controlled when cutting off the power supply electronic sub-gate control circuit separating brake when incoming call.

3. multifunctional intellectual residual current circuit breaker according to claim 1 is characterized in that: described central control unit also is connected with the leakage current display circuit.

4. according to the described multifunctional intellectual residual current circuit breaker of one of claim 1-3, it is characterized in that: described central control unit also is connected with the DIP switch circuit.

5. according to the described multifunctional intellectual residual current circuit breaker of one of claim 1-3, it is characterized in that: described central control unit also is connected with long-range divide-shut brake supervisory circuit.