CN201018265Y

CN201018265Y - Electronic control apparatus used for electric leakage protection

Info

Publication number: CN201018265Y
Application number: CNU2007200331419U
Authority: CN
Inventors: 章祖德
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-01-01
Filing date: 2007-01-01
Publication date: 2008-02-06
Anticipated expiration: 2017-01-01

Abstract

An electronic control device for leakage protection is provided, which belongs to a low-voltage power distribution protection device. The utility model comprises a zero sequence current transformer CT1 and CT2, a thyrister SCR, a power source circuit, an amplification circuit, a detection circuit and a testing circuit. A phase line and a zero line in the power source that is connected to a switch K of a release pass the zero sequence current transformer CT1; an earth line in the power source that is connected to the switch K of the release passes the zero sequence current transformer CT2; the power source circuit is connected to the zero line, the amplification circuit, the detection circuit, an electromagnetic coil L, the thyrister SCR that do no pass the zero sequence current transformer CT1; the testing circuit is connected to a phase line that does not pass the zero sequence current transformer CT1 and a zero line that passes the zero sequence current transformer CT1; the detection circuit is connected to a secondary coil and a thyrister SCR of the zero sequence current transformer CT2; the amplification circuit is connected to the secondary coil, the detection circuit and the thyrister SCR of the zero sequence current transformer CT1. Therefore, the utility model is able to prevent the electric shock due to the malfunction of electric apparatus or power source.

Description

A kind ofly be used for earth leakage protective electronic-controlled installation

Technical field

The utility model relates to a kind of electronic-controlled installation, particularly a kind ofly is used for earth leakage protective electronic-controlled installation, belongs to low-voltage distribution protective device technical field.

Background technology

At present, the electrical equipment that China family uses is because electrical network situation complexity, and the potential safety hazard of existence is more,, imperfect earth incorrect as the appliance socket wiring, disorderly drag disorderly draw, the low of inferior quality power failure of line quality and cause electric appliance casing charged, cause electric shock accidents.

Summary of the invention

The purpose of this utility model provides a kind of earth leakage protective electronic-controlled installation that is used for that prevents electric shock accidents.

The purpose of this utility model is achieved like this: a kind ofly be used for earth leakage protective electronic-controlled installation; it comprises zero sequence current mutual inductor CT1; CT2; controllable silicon SCR; power circuit; amplifying circuit; testing circuit; hookup; K switch connects the phase line 2 in the power supply in the release; zero line 3 passes zero sequence current mutual inductor CT1; the ground wire 1 that K switch connects in the power line in the release passes zero sequence current mutual inductor CT2; power circuit and the zero line 3 that does not pass zero sequence current mutual inductor CT1; amplifying circuit; testing circuit; electromagnet coil L in the release; controllable silicon SCR connects; hookup is connected with the zero line 3 that passes zero sequence current mutual inductor CT1 with the phase line 2 of not passing zero sequence current mutual inductor CT1; the secondary coil of testing circuit and zero sequence current mutual inductor CT2; controllable silicon SCR connects, amplifying circuit and zero sequence current mutual inductor CT1 secondary coil; testing circuit; controllable silicon SCR connects.

Power circuit is by diode D1, LED, resistance R 1, R4, capacitor C 3 is formed, diode D1 anode and controllable silicon SCR anode, the end of electromagnet coil L connects in the release, diode D1 negative electrode and resistance R 1, the end of R4 connects, the other end of resistance R 4 is connected with the LED anode, the negative electrode of LED is connected with the zero line 3 that does not pass current transformer CT1, one end of the other end of resistance R 1 and capacitor C 3,8 pin of integrated circuit (IC) 2 in the testing circuit, 8 pin of integrated circuit (IC) 1 connect in the amplifying circuit, and capacitor C 3 other ends are connected with zero line 3.

Amplifying circuit is by integrated circuit (IC) 1, diode D2, resistance R 2, R3, capacitor C 1, C2, C4-C6 forms, one end of diode D2 negative electrode and capacitor C 1, the controllable silicon SCR control utmost point, 7 pin of integrated circuit (IC) 2 connect in the testing circuit, 7 pin of diode D2 anode and integrated circuit (IC) 1, one end of capacitor C 2 connects, the other end of capacitor C 2 is connected with 6 pin of integrated circuit (IC) 1, one end of capacitor C 4 is connected with 5 pin of integrated circuit (IC) 1,2 pin of integrated circuit (IC) 1 and capacitor C 5, one end of resistance R 6 connects, the other end of resistance R 6 is connected with an end of resistance R 3, one end of the other end of resistance R 3 and resistance R 2, one end of

capacitor C

6,5 ends of zero sequence current mutual inductor CT1 secondary coil connect, the other end of the other end of resistance R 2 and

capacitor C

6,1 pin of integrated circuit (IC) 1,4 ends of zero sequence current mutual inductor CT1 secondary coil connect, capacitor C 1, C4, the other end of C5,3 pin connecting to neutral lines 3 of integrated circuit (IC) 1.

Testing circuit is made up of integrated circuit (IC) 2 and resistance R 6-R9, the end of resistance R 6, R7 is connected with 2 pin of integrated circuit (IC) 2, the other end of resistance R 6 is connected with 5 pin of integrated circuit (IC) 2, the end of resistance R 8, R9 is connected with 6 pin of integrated circuit (IC) 2, the other end of resistance R 9 is connected with 8 pin of integrated circuit (IC) 2,1 pin of integrated circuit (IC) 2 is connected with 6 ends of zero sequence current mutual inductor CT2 secondary coil, 7 termination zero lines 3 of 4 pin of the other end of resistance R 7, R8, integrated circuit (IC) 2, zero sequence current mutual inductor CT2 coil.

Phase line of the present utility model, zero line pass zero sequence current mutual inductor, pickoff signals is handled by amplifying circuit, ground wire passes zero sequence current mutual inductor, pickoff signals is handled by testing circuit, Each performs its own functions for the two, and signal is given controllable silicon SCR in the lump, and controllable silicon SCR control release is cut off the electricity supply, therefore not only can prevent the electric shock that causes because of apparatus failure, and can also prevent power failure and the electric shock that causes.

The drawing explanation

Accompanying drawing is an electrical schematic diagram of the present utility model.

Embodiment

In earth leakage protective device, release is made up of movement devices such as electromagnet and snap close and the K switch with three groups of contacts.Phase in the power line, zero, ground wire are through supplying with relevant electrical equipment electricity consumption after the K switch.In the power circuit, phase line, zero line are through diode D1 halfwave rectifier, and resistance R 1 step-down is supplied with DC power supply after capacitor C 3 filtering, and LED is made on/off usefulness, and R4 is the current-limiting resistance of LED.Another termination power phase line 2 of electromagnet coil L1 in the release.The controllable silicon SCR negative electrode is connected with zero line 2.Hookup is made up of button T and resistance R 5, an end of resistance R 5 with do not pass zero sequence current mutual inductor CT1 phase line 2 and be connected, the other end is connected with the end of button T, the other end of button T is connected with the zero line 3 that passes zero sequence current mutual inductor CT1.When pressing the button T, flow through the leakage current of a simulation among the zero sequence current mutual inductor CT1, whether its current value is by resistance R 5 decisions, effective for the creepage protection function of testing product.Integrated circuit (IC) 1 is CS54123 in the amplifying circuit, and the input circuit of integrated circuit (IC) 1 is the secondary coil of zero sequence current mutual inductor CT1, and C2 is a resonant capacitance, to improve the amplitude of input signal.Resistance R 2 can be adjusted residual operating current, and C1, C4, C5, C6 are filter capacitor, play anti-interference effect, and the effect of diode D2 is to prevent that the signal of integrated circuit (IC) 2 is integrated IC circuit 1 bypass.Integrated circuit (IC) 2 is LM358 in the testing circuit, and wherein a part is done the signal amplification, and the signal of secondary winding 6 ends of zero sequence current mutual inductor CT2 is given and amplified the input of back as another amplifier section comparator, and output signal is delivered to the control utmost point of controllable silicon SCR.The multiplication factor of the ratio decision amplifier of resistance R 6, R7, the reference point of the ratio decision comparator of resistance R 8, R9.Adjust the size that resistance R 8 can change leakage current.

Power supply phase line 2, zero line 3 pass zero sequence current mutual inductor CT1, power ground passes zero sequence current mutual inductor CT2, its signal that picks up is handled by amplifying circuit and testing circuit respectively, in appointing single line, there is electric leakage to produce (except the loop current that phase line 2 and zero line are 3), the action of controllable silicon SCR control release, at 0.1 second internal cutting off power supply, can prevent that electric shock accidents from taking place.

Claims

1. one kind is used for earth leakage protective electronic-controlled installation; it is characterized in that it comprises zero sequence current mutual inductor (CT1); (CT2); controllable silicon (SCR); power circuit; amplifying circuit; testing circuit; hookup; switch in the release (K) connects the phase line (2) in the power supply; zero line (3) passes zero sequence current mutual inductor (CT1); the ground wire (1) that switch in the release (K) is connect in the power line passes zero sequence current mutual inductor (CT2); power circuit and the zero line (3) that does not pass zero sequence current mutual inductor (CT1); amplifying circuit; testing circuit; electromagnet coil in the release (L); controllable silicon (SCR) connects; hookup is connected with the zero line that passes zero sequence current mutual inductor (CT1) (3) with the phase line of not passing zero sequence current mutual inductor (CT1) (2); the secondary coil of testing circuit and zero sequence current mutual inductor (CT2); controllable silicon (SCR) connects, amplifying circuit and zero sequence current mutual inductor (CT1) secondary coil; testing circuit; controllable silicon (SCR) connects.

2. a kind of earth leakage protective electronic-controlled installation that is used for according to claim 1; it is characterized in that power circuit is by diode (D1); light-emitting diode (LED); resistance (R1); (R4); electric capacity (C3) is formed; diode (D1) anode and controllable silicon (SCR) anode; one end of electromagnet coil in the release (L) connects; diode (D1) negative electrode and resistance (R1); (R4) a end connects; the other end of resistance (R4) is connected with light-emitting diode (LED) anode; the negative electrode of light-emitting diode (LED) is connected with the zero line that does not pass current transformer (CT1) (3); one end of the other end of resistance (R1) and electric capacity (C3); 8 pin of integrated circuit in the testing circuit (IC2); 8 pin of integrated circuit in the amplifying circuit (IC1) connect, and electric capacity (C3) other end is connected with zero line (3).

3. a kind of earth leakage protective electronic-controlled installation that is used for according to claim 1; it is characterized in that amplifying circuit is by integrated circuit (IC1); diode (D2); resistance (R2); (R3); electric capacity (C1); (C2); (C4)-(C6) form; one end of diode (D2) negative electrode and electric capacity (C1); controllable silicon (SCR) the control utmost point; 7 pin of integrated circuit in the testing circuit (IC2) connect; 7 pin of diode (D2) anode and integrated circuit (IC1); one end of electric capacity (C2) connects; the other end of electric capacity (C2) is connected with 6 pin of integrated circuit (IC1); one end of electric capacity (C4) is connected with 5 pin of integrated circuit (IC1); 2 pin of integrated circuit (IC1) and electric capacity (C5); one end of resistance (R6) connects; the other end of resistance (R6) is connected with an end of resistance (R3); one end of the other end of resistance (R3) and resistance (R2); one end of electric capacity (C6); (5) end of zero sequence current mutual inductor (CT1) secondary coil connects; the other end of the other end of resistance (R2) and electric capacity (C6); (1) pin of integrated circuit (IC1); 4 ends of zero sequence current mutual inductor (CT1) secondary coil connect, electric capacity (C1); (C4); (C5) the other end; 3 pin connecting to neutral lines (3) of integrated circuit (IC1).

4. a kind of earth leakage protective electronic-controlled installation that is used for according to claim 1; it is characterized in that testing circuit is by integrated circuit (IC2) and resistance (R6)-(R9) form; resistance (R6); (R7) a end is connected with 2 pin of integrated circuit (IC2); the other end of resistance (R6) is connected with 5 pin of integrated circuit (IC2); resistance (R8); (R9) a end is connected with 6 pin of integrated circuit (IC2); the other end of resistance (R9) is connected with 8 pin of integrated circuit (IC2); 1 pin of integrated circuit (IC2) is connected with 6 ends of zero sequence current mutual inductor (CT2) secondary coil, resistance (R7); (R8) the other end; 4 pin of integrated circuit (IC2); 7 termination zero lines (3) of zero sequence current mutual inductor (CT2) coil.