CN2062510U - Civil limit electricity and leakage safety device - Google Patents

Abstract

The utility model relates to a civil limit electricity and leakage safety device, comprising a high-current sampling resistor as a limit electricity device, a zero sequence current transformer as a leakage safety sensing device, a control relay and a plurality of resistor capacitor units and diodes which compose a current limiting detection circuit, a rapid response circuit, a control relay drive circuit composed of four transistors and a six stage ungated integrated circuit, a resistance-capacity integral delay circuit, a resistance-capacity differential delay circuit, a resistance voltage division circuit, etc. The utility model can realize the limit electricity control to the electricity utilization of large power electric appliances, when the phase wire electric leakage and electric shock happens, the power supply can be switched off instantly, and after the abnormal situation is eliminated, the power supply can be switched on repeatedly.

Description

Civil limit electricity and leakage safety device

The utility model belongs to civilian power supply control device.

Existing overcurrent leakage switch with the electric leakage protection function of rationing the power supply mostly is mechanical structure greatly, and complex manufacturing and control precision are not high, do not have again and recover to send the electric work energy automatically.

The purpose of this utility model provides a kind of civilian limit electricity consumption electric leakage protector that adopts electronic circuit to realize limit electricity consumption electric leakage protection function.

The utility model is by feeling big current sampling resistor R and zero sequence current mutual inductor LH, the control relay J that distinguishes device, the transistor BG that constitutes limit detection circuit as limit electricity consumption and electric leakage security personnel respectively ₁, constitute the transistor BG of the circuit that makes an immediate response ₂, constitute the transistor BG of the drive circuit of control relay J ₃With BG ₄, comprise 6 grades of not gate F ₁-F ₆Integrated circuit (IC), some Resistor-Capacitor Units and diode form, comprising being serially connected in not gate F ₁With F ₂Between by resistance R ₅And capacitor C ₅The integration type delay circuit of forming, be serially connected in not gate F ₃With F ₄Between by capacitor C ₆And resistance R ₇The differential expression delay circuit of forming and be serially connected in big current sampling resistor R and make an immediate response between the circuit input end by resistance R ₁₃And R ₁₄The linear bleeder circuit of forming.All components and parts all are assemblied in becomes a stand-alone assembly on the bar printing wiring board, and is installed in the watt-hour meter casing of adapted with it.

If on the big current sampling resistor R volume of transfiniting electricity consumption electric current is arranged, exceed the transistor BG that forms limit detection circuit in a flash in certain of each cycle of alternating current ₁During turn-on threshold voltage, transistor BG ₁Conducting is by by resistance R ₄And capacitor C ₄The low-pass filtering branch road of forming in parallel exports the not gate F of integrated circuit (IC) to electronegative potential ₁Input is by not gate F ₁Output output high potential passes through by resistance R again ₅And capacitor C ₅The integration type delay circuit of forming adds to the not gate F of integrated circuit (IC) ₂, then successively by not gate F ₃, F ₄, F ₅And F ₆, driving transistors BG ₃, BG ₄It is electric that control relay J coil is got, and it is serially connected with the normally-closed contact J in the power circuit ₁Disconnect, thereby cut off the electricity supply.The utility model just occurs making electric current on the big current sampling resistor R even as big as exceeding transistor BG in power circuit ₁Just begin action during turn-on threshold voltage, not influenced by ambient temperature basically, and its power-off delay time T ₁By resistance R ₅And capacitor C ₅Parameter product R ₅, C ₅Decision.This value is more stable.Consider in the civil electric appliance that it is 3 seconds that the starting time of refrigerator is about most, the utility model power-off delay time T ₁Be decided to be 7 seconds, therefore, the refrigerator electric appliances moves greater than the outage that during starts can not take place to take place of the utility model limit electricity consumption electric current at starting current.

The utility model has also designed by transistor BG ₂The circuit of forming that makes an immediate response.Big electric current in power circuit, occurs, be generally control relay J normally-closed contact J ₁Maximum turn-off current the time, the voltage that is obtained by big current sampling resistor R sampling is by by resistance R ₁₃, R ₁₄The linear bleeder circuit of forming is in resistance R ₁₄On dividing potential drop exceed transistor BG ₂Turn-on threshold voltage, transistor BG ₂Conducting, its output signal are directly through the not gate F of integrated circuit (IC) ₃, F ₄, F ₅And F ₆Driving transistors BG ₃, BG ₄, and without by resistance R ₅And capacitor C ₅The integration type delay circuit of forming, make control continue device J coil immediately electric, its normally-closed contact J ₁Immediately disconnect.Because therefore, be make an immediate response outage for the millisecond magnitude pickup time that need only consider control relay J.

The utility model is at the not gate F of integrated circuit (IC) ₃With F ₄Between be serially connected with by capacitor C ₆And resistance R ₇The differential expression delay circuit of forming, its, constant was that recovery constant conduction time of the present utility model is far longer than power-off time constant, i.e. capacitor C time of delay ₆And resistance R ₇Parameter value very big.Considering that the refrigerator electric appliances is reset the time interval should be at least greater than 3 minute, and the utility model recovers energising T time of delay ₂Be decided to be 4 minutes.Because design has by capacitor C ₆And resistance R ₇The differential expression delay circuit of forming is as the not gate F of integrated circuit (IC) ₄When the input current potential drops to certain value with driving transistors BG ₃, BG ₄Change operating state, make control relay J coil losing electricity, its normally-closed contact J ₁Recover to connect, thereby power circuit is switched on again.

The utility model also is provided with on the power supply phase line by zero sequence current mutual inductor LH and distinguishes device as line electrical leakage security personnel sense, and its output directly adds to the circuit input end that makes an immediate response.Have leakage current in case zero sequence current mutual inductor LH detects in the power circuit phase line, comprise when electric shock accidents occurring, by the circuit that makes an immediate response can make control relay J coil immediately electric, its normally-closed contact J ₁Immediately disconnect, cut off the electricity supply.Equally, at T time of delay that switches on through over recovery ₂After, will lead to again.

Technique scheme can realize the purpose of this utility model satisfactorily.Can carry out the limit electric control to the high-power electric appliance electricity consumption, play the effect of economize on electricity and protection supply line and power supply unit, and when the phase line electric leakage taking place and get an electric shock; can immediately cut off the power supply; have protection function, after abnormal conditions are removed, can also switch on again.In addition, the utility model belongs to capacitive load, to a certain extent magnet exciting coil in the kilowatt-hour meter is had the power factor compensation effect.

Accompanying drawing is the utility model electrical schematic diagram, diode D among the figure ₁, voltage stabilizing two pipe D ₂And capacitor C ₃For integrated circuit (IC) provides dc supply, diode D ₃-D ₆And capacitor C ₃J provides dc supply for control relay, diode D ₇, D ₉The capacitor discharge path is provided.

Embodiment limit electricity consumption value 2.5 peaces,

Device J:JZC-22F/15A continues for big current sampling resistor R:0.17 Europe, control

Transistor BG ₁: CS9013 BG ₂: CS9013

BG ₃CS9012 BG ₄：CS9013

Integrated circuit (IC): CD4069

Resistance R ₅: the 510K capacitor C ₅₁22 μ power-off delay time T ₁: 7 seconds

Resistance R ₇: the 1.5M capacitor C ₆: 220 μ recover charging T time of delay ₂: 4 minutes

Resistance R ₁₃: the 10K resistance R ₁₄: 3.3K

Diode D ₁: 1N4148 voltage stabilizing didoe: D ₂BZX83C 0.5W6V

Voltage stabilizing didoe: D ₆BZ * 83C 0.5W15V

Diode D ₃-D ₅: 3 * 1N4148

Diode D ₇: 1N4148 diode D ₉1N4148

Zero sequence current mutual inductor LH:

Claims (1)

1, feels big current sampling resistor R and zero sequence current mutual inductance LH, the control relay J that distinguishes device, the transistor BG that constitutes limit detection circuit as limit electricity consumption and electric leakage security personnel a kind of comprising respectively ₁, constitute the transistor BG of the circuit that makes an immediate response ₃With BG ₄And the civilian limit electricity consumption electric leakage protector of some Resistor-Capacitor Units and diode, it is characterized in that being provided with flow valuve divider resistance R ₁₃, R ₁₄, also be provided with and comprise 6 grades of not gate F ₁-F ₆Integrated circuit (IC), be serially connected in not gate F ₁With F ₂Between by resistance R ₅And capacitor C ₅The integration type delay circuit of forming and be serially connected in not gate F ₃With F ₄Between by capacitor C ₆And resistance R ₇The differential expression delay circuit of forming, the time constant of differential expression delay circuit is far longer than the time constant of integration type delay circuit.

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