CN201001022Y

CN201001022Y - Test device for aftercurrent simulation

Info

Publication number: CN201001022Y
Application number: CNU2007200335481U
Authority: CN
Inventors: 管瑞良; 潘振克; 奚慎云; 徐伟; 殷建强
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2007-01-11
Filing date: 2007-01-11
Publication date: 2008-01-02
Anticipated expiration: 2017-01-11

Abstract

The utility model relates to a residual current simulated test device, which is used for the performance characteristic test of a residual current protection device in the low pressure distribution network. The utility model comprises a microprocessing unit, a test trigger circuit, a filter circuit, a drive circuit, a zero sequence current mutualinductor, an amplifying circuit, a control circuit and an actuating mechanism, wherein the test trigger circuit is connected with the microprocessing unit,, the measuring coil of the zero sequence current mutualinductor is connected with a sampling circuit, the sampling circuit is connected with the amplifying circuit, the amplifying circuit is connected with the microprocessing unit, the microprocessing unit is connected with the filter circuit, the filter circuit is connected with the drive circuit, the drive circuit is connected with the test coil of the zero sequence current mutualinductor, the microprocessing unit is connected with the control circuit, and the control circuit is connected with the actuating mechanism. The utility model has the advantages that even if a three-phase alternating current occurs the phase loss, the test is operated continuously; the problem that the large electric energy consumption and big occupied space are brought by adopting the high-power resistance is avoided; the problem that the trip coil is easy to burn because a test button is pressed continuously is avoided.

Description

Be used for the residual current simulation test device

Technical field

The utility model relates to a kind of simulation test device, and particularly the residual current simulation test device is used for the operating characteristics test of the Aftercurrent protecting equipment of low-voltage network.

Background technology

The residual current acting attribute testing is an important tests project of Aftercurrent protecting equipment (as the residual current protecting breaker of plastic casing).Traditional both at home and abroad simulation experiment circuit that Aftercurrent protecting equipment adopted is made up of test button XB, current-limiting resistance R, testing coil L1, zero sequence current mutual inductor TA, measurement coil L2, testing circuit, actuator, tripping coil L generally as shown in Figure 1.Be connected on alternating voltage 380V or the 220V after test button XB, current-limiting resistance R, the testing coil L1 series connection, in case wherein one phase failure situation appears mutually, promptly be equivalent to lose the power supply of hookup, test can't be moved; Simultaneously owing to adopted high-power pure resistance to make current-limiting resistance to link to each other with alternating voltage and form test current, electric energy loss greatly and the increase that takes up room; If push testing button in addition continuously, the easy scaling loss of tripping coil L.Above reason causes it to have very big limitation aspect reliability, practicality and fail safe.

Patent document CN1400619A discloses a kind of test circuit of residual current circuit breaker; traditional residual current protecting type device has been carried out certain improvement; the tandem tap that promptly in test circuit, has added the closure along with residual current circuit breaker, disconnection or a tripping operation and dropped into or cut off; to guarantee when testing motion test; even push testing button continuously; tripping coil L can scaling loss yet; can't test but still can not solve the phase failure, and owing to adopt high-power resistance to cause the big and big problem that takes up room of electric energy loss.

In Aftercurrent protecting equipment today, be badly in need of a kind of simple, novel circuit and realize the residual current test, and can overcome above-mentioned shortcoming to intelligent development.

Summary of the invention

The purpose of this utility model provides a kind of residual current simulation test device that is used for, can overcome under phase failure situation and can't test, adopt high-power resistance to cause that electric energy loss is big, volume increases and push defectives such as testing button, the easy scaling loss of tripping coil L continuously.

The purpose of this utility model is achieved like this, a kind of residual current simulation test device that is used for, comprise microprocessing unit 1, test circuits for triggering 2, filter circuit 3, drive circuit 4, zero sequence current mutual inductor 5, sample circuit 6, amplifying circuit 7, control circuit 8 and actuator 9, test circuits for triggering 2 are connected to microprocessing unit 1, the measurement coil L2 of zero sequence current mutual inductor 5 is connected to sample circuit 6, sample circuit 6 is connected to amplifying circuit 7, amplifying circuit 7 is connected to microprocessing unit 1, microprocessing unit 1 is connected to filter circuit 3, filter circuit 3 is connected to drive circuit 4, drive circuit 4 is connected to the testing coil L1 of zero sequence current mutual inductor 5, microprocessing unit 1 is connected to control circuit 8, and control circuit 8 is connected to actuator 9.

Microprocessing unit 1 described in the utility model is by microprocessor N1, resistance R 1, R2, capacitor C 1～C5, crystal oscillator G1 forms, one end of resistance R 1 and an end of

capacitor C

4,3 pin of microprocessor N1 connect, one end of the other end and

capacitor C

1,7 pin of microprocessor N1,19 pin meet power supply VCC, the end of crystal oscillator G1 and 6 pin of microprocessor N1, one end of capacitor C 2 connects, 4 pin of the other end and microprocessor N1, one end of capacitor C 3 connects, one end of resistance R 2 is connected with 2 pin of microprocessor N1, one end of capacitor C 5 is connected with 23 pin of microprocessor N1,15 pin of microprocessor N1 are connected with test circuits for triggering 2,14 pin of microprocessor N1 are connected with

filter circuit

3,16 pin of microprocessor N1 are connected with

control circuit

8,24 pin of microprocessor N1,25 pin are connected with amplifying circuit 7, the other end of capacitor C 1～C5, the other end of

resistance R

2,5 pin of microprocessor N1,21 pin ground connection.

Test circuits for triggering 2 described in the utility model are button SW1, one termination microprocessing unit 1, other end ground connection.

Filter circuit 3 described in the utility model is made up of resistance R 3～R5, capacitor C 6, C7, one end of resistance R 3 is connected with microprocessing unit 1, the other end is connected with the positive pole of capacitor C 6, an end of resistance R 4, the other end of resistance R 4 is connected with the end of R5, an end of capacitor C 7, and be connected the other end of the negative pole of capacitor C 6 and resistance R 5, the other end ground connection of capacitor C 7 with drive circuit 4.

Drive circuit 4 described in the utility model is made up of operational amplifier N2,

resistance R

6,8 pin of operational amplifier N2 meet power supply VCC, 4 pin ground connection, 3 pin are connected with

filter circuit

3,1 pin, 2 pin are connected with an end of resistance R 6, and the other end of resistance R 6 is connected with the end of the testing coil L1 of zero sequence current mutual inductor 5.

Sample circuit 6 described in the utility model is made up of resistance R 7, capacitor C 8～C10, diode D1, D2, resistance R 7 is in parallel with the measurement coil L2 of zero sequence current mutual inductor 5, the one end is connected with the end of capacitor C 9, C8, the anode of diode D1, the negative electrode of diode D2 again, and be connected with amplifying circuit 7, its other end is connected the other end ground connection of capacitor C 8 and C10 with the other end, an end of capacitor C 10, the negative electrode of diode D1, the anode of diode D2, power supply+2.5V, the amplifying circuit 7 of capacitor C 9.

Amplifying circuit 7 described in the utility model is by operational amplifier N3A, N3B, resistance R 8～R16, capacitor C 11～C14 forms, one end of resistance R 8 is connected with sample circuit 6, the other end and resistance R 10, the end of R11, one end of capacitor C 11 connects, the other end of resistance R 10 is connected with 2 pin of operational amplifier N3A, the other end of the other end of resistance R 11 and

capacitor C

11,1 pin of operational amplifier N3A, resistance R 12, the end of R13 connects, the other end of resistance R 12 is connected with an end of capacitor C 12, and be connected with microprocessing unit 1, one end of resistance R 9 is connected with 3 pin of operational amplifier N3A, another termination power+2.5V and sample circuit, one end of the other end of resistance R 13 and resistance R 15, one end of

capacitor C

13,6 pin of operational amplifier N3B connect, the other end of the other end of resistance R 15 and

capacitor C

13,7 pin of operational amplifier N3B, one end of resistance R 16 connects, the other end of resistance R 16 is connected with an end of capacitor C 14, and be connected with microprocessing unit 1, one end of resistance R 14 is connected with 5 pin of operational amplifier N3B, another termination power+2.5V, capacitor C 12, the other end of C14, the 4 pin ground connection of operational amplifier N3A, 8 pin of operational amplifier N3A meet power supply VCC.

Control circuit 8 described in the utility model is made up of resistance R 17, R18, capacitor C 15, triode VT1, one end of resistance R 17 is connected with microprocessing unit 1, the other end is connected with an end of capacitor C 15, an end of resistance R 18, the base stage of triode VT1, the grounded emitter of the other end of the other end of capacitor C 15 and resistance R 18, triode VT1, the collector electrode of triode VT1 is connected with actuator 9.

Actuator 9 described in the utility model is made up of diode D4, tripping coil L, the termination power VCC of the negative electrode of diode D4 and tripping coil L, and the anode of diode D4 is connected with the other end, the control circuit 8 of tripping coil L.

The disclosed a kind of residual current simulation test device advantage that is used for of the utility model is: adopt independent power supply VCC that hookup is powered, still can continue test even the phase failure appears in three-phase alternating current; Provide the test triggering signal by the test circuits for triggering to microprocessing unit, microprocessor output and the corresponding pulse-width modulation of residual current signal characteristic (PWM) signal, through the testing coil of filtering rear drive zero sequence current mutual inductor, avoided the big and big problem that takes up room of electric energy loss that adopts high-power resistance to bring; Carry out mould/number conversion and handle by the induced signal sampling of the measurement coil of zero sequence current mutual inductor is amplified, compare with its inner leakage current operating value that is provided with, send actuating signal by microprocessor to control circuit, avoided pushing continuously testing button, the problem of the easy scaling loss of tripping coil L, whole test device have the advantage of reliability height, practicality, safety.

Description of drawings

Fig. 1 is the simulation experiment circuit block diagram of traditional Aftercurrent protecting equipment.

Fig. 2 is a schematic block circuit diagram of the present utility model.

Fig. 3 is the circuit theory diagrams of microprocessing unit 1 of the present utility model and test circuits for triggering 2.

Fig. 4 is the circuit theory diagrams of the testing coil of filter circuit 3 of the present utility model, drive circuit 4 and zero sequence current mutual inductor 5.

Fig. 5 is the circuit theory diagrams of measurement coil, sample circuit 6 and the amplifying circuit 7 of zero sequence current mutual inductor 5 of the present utility model.

Fig. 6 is the circuit theory diagrams of control circuit 8 of the present utility model and actuator 9.

Embodiment

In Fig. 1, provided the simulation experiment circuit block diagram of traditional Aftercurrent protecting equipment, its execution mode is set forth in background technology.

In Fig. 2, provided schematic block circuit diagram of the present utility model, wherein test circuits for triggering 2 and be connected to microprocessing unit 1, the measurement coil L2 of zero sequence current mutual inductor 5 is connected to sample circuit 6, sample circuit 6 is connected to amplifying circuit 7, amplifying circuit 7 is connected to microprocessing unit 1, microprocessing unit 1 is connected to filter circuit 3, filter circuit 3 is connected to drive circuit 4, drive circuit 4 is connected to the testing coil L1 of zero sequence current mutual inductor 5, microprocessing unit 1 is connected to control circuit 8, and control circuit 8 is connected to actuator 9.Test circuits for triggering 2 provide triggering signal; Filter circuit 3 carries out shaping with the pwm signal of microprocessing unit 1 output; Drive circuit 4 is delivered to the signal after the shaping among the testing coil L1 of zero sequence current mutual inductor 5; By the measurement coil L2 of zero sequence current mutual inductor 5 and the induction between testing coil L1, signal is sent into sample circuit 6; 6 pairs of current signals of sample circuit are sampled and are transformed to voltage signal; Amplifying circuit 7 carries out processing and amplifying with voltage signal; Control circuit 8 receives the actuating signal that microprocessing unit 1 is sent here, the action of control executing mechanism 9; The action of threading off is carried out in actuator's 9 controlled circuit controls.

In Fig. 3, provided the circuit theory diagrams of microprocessing unit 1 of the present utility model and test circuits for triggering 2, wherein preferably to adopt model be the single-chip microcomputer of R5F21134DFP to microprocessor N1.Resistance R 1, capacitor C 4 provide reset signal for microprocessor N1; Resistance R 2 is as the pull down resistor of 2 pin of microprocessor N1; Crystal oscillator G1 and capacitor C 2, C3 form crystal oscillating circuit, and the operating frequency of microprocessor N1 is provided; Capacitor C 1 is as the digital power of microprocessor N1, the filter capacitor of analog power; Capacitor C 5 connects the filter capacitor of 23 pin of microprocessor N1 as internal electric source; 15 pin of microprocessor N1 meet the button SW1 of test circuits for triggering 2, obtain triggering signal; The 14 pin output pwm signals of microprocessor N1 are to filter circuit 3; The 16 pin output action signal TK of microprocessor N1 are to control

circuit

8, and 24 pin of microprocessor N1,25 pin will be delivered to internal mode/number conversion circuit from signal AD1, the AD2 of amplifying circuit 7 outputs.

In Fig. 4, the circuit theory diagrams of the testing coil L1 of filter circuit 3 of the present utility model, drive circuit 4 and zero sequence current mutual inductor 5 have been provided, pwm signal from microprocessing unit 1 is connected to the filter circuit of being made up of resistance R 3～R5, capacitor C 6, C7 3, filter circuit 3 carries out shaping with pwm signal, deliver to the drive circuit of being made up of operational amplifier N2 (preferred model LM258), resistance R 64 then and handle, the testing coil L1 that outputs to zero sequence current mutual inductor 5 again produces test current.Testing coil L1 one end is connected with resistance R 6, other end ground connection.

In Fig. 5, the circuit theory diagrams of measurement coil L2, sample circuit 6 and the amplifying circuit 7 of zero sequence current mutual inductor 5 of the present utility model have been provided, the measurement coil L2 two ends of zero sequence current mutual inductor 5 are connected to the sample circuit of being made up of resistance R 7, capacitor C 8～C10, diode D1, D2 6, and the current conversion that measures is become voltage; Sample circuit 6 connects by operational amplifier N3A, N3B (A of dual operational amplifier, B two parts, model TLC2252), the two-stage amplifying circuit 7 of resistance R 8～R16, capacitor C 11～C14 composition, first order amplifying circuit output AD1 signal is to 24 pin of the microprocessor N1 of microprocessing unit 1, satisfy wide range and amplify needs, second level amplifying circuit output AD2 signal satisfies Cheng Fangda needs in a small amount to 25 pin of the microprocessor N1 of microprocessing unit 1.

In Fig. 6, the circuit theory diagrams of control circuit 8 of the present utility model and actuator 9 have been provided, actuating signal TK from microprocessing unit 1 delivers to the control circuit of being made up of resistance R 17, R18, capacitor C 15, triode VT1 (preferred model is 9013) 8, and the collector electrode of triode VT1 is connected to the actuator 9 that is made up of diode D4 and tripping coil L.When actuating signal TK was high level, triode VT1 conducting was flow through electric current among the tripping coil L, produced electromagnetic attraction, made the protective device action, thereby finished the residual current analogue test.

Claims

1, a kind of residual current simulation test device that is used for, it is characterized in that comprising microprocessing unit (1), test circuits for triggering (2), filter circuit (3), drive circuit (4), zero sequence current mutual inductor (5), sample circuit (6), amplifying circuit (7), control circuit (8) and actuator (9), test circuits for triggering (2) are connected to microprocessing unit (1), the measurement coil L2 of zero sequence current mutual inductor (5) is connected to sample circuit (6), sample circuit (6) is connected to amplifying circuit (7), amplifying circuit (7) is connected to microprocessing unit (1), microprocessing unit (1) is connected to filter circuit (3), filter circuit (3) is connected to drive circuit (4), drive circuit (4) is connected to the testing coil (L1) of zero sequence current mutual inductor (5), microprocessing unit (1) is connected to control circuit (8), and control circuit (8) is connected to actuator (9).

2, the residual current simulation test device that is used for according to claim 1, it is characterized in that described microprocessing unit (1) is by microprocessor (N1), resistance (R1), (R2), electric capacity (C1)～(C5), crystal oscillator (G1) is formed, one end of one end of resistance (R1) and electric capacity (C4), 3 pin of microprocessor (N1) connect, one end of the other end and electric capacity (C1), 7 pin of microprocessor (N1), 19 pin connect power supply (VCC), 6 pin of one end of crystal oscillator (G1) and microprocessor (N1), one end of electric capacity (C2) connects, 4 pin of the other end and microprocessor (N1), one end of electric capacity (C3) connects, one end of resistance (R2) is connected with 2 pin of microprocessor (N1), one end of electric capacity (C5) is connected with 23 pin of microprocessor (N1), 15 pin of microprocessor (N1) are connected with test circuits for triggering (2), 14 pin of microprocessor (N1) are connected with filter circuit (3), 16 pin of microprocessor (N1) are connected with control circuit (8), 24 pin of microprocessor (N1), 25 pin are connected with amplifying circuit (7), the other end of electric capacity (C1)～(C5), the other end of resistance (R2), 5 pin of microprocessor (N1), 21 pin ground connection.

3, the residual current simulation test device that is used for according to claim 1 is characterized in that described test circuits for triggering (2) are button (SW1), one termination microprocessing unit (1), other end ground connection.

4, the residual current simulation test device that is used for according to claim 1, it is characterized in that described filter circuit (3) is made up of resistance (R3)～(R5), electric capacity (C6), (C7), one end of resistance (R3) is connected with microprocessing unit (1), the other end is connected with the positive pole of electric capacity (C6), an end of resistance (R4), the other end of resistance (R4) is connected with an end of an end of (R5), electric capacity (C7), and be connected the other end of the negative pole of electric capacity (C6) and resistance (R5), the other end ground connection of electric capacity (C7) with drive circuit (4).

5, the residual current simulation test device that is used for according to claim 1, it is characterized in that described drive circuit (4) is made up of operational amplifier (N2), resistance (R6), 8 pin of operational amplifier (N2) connect power supply (VCC), 4 pin ground connection, 3 pin are connected with filter circuit (3), 1 pin, 2 pin are connected with an end of resistance (R6), and the other end of resistance (R6) is connected with an end of the testing coil (L1) of zero sequence current mutual inductor (5).

6, the residual current simulation test device that is used for according to claim 1, it is characterized in that described sample circuit (6) is by resistance (R7), electric capacity (C8)～(C10), diode (D1), (D2) form, resistance (R7) is in parallel with the measurement coil (L2) of zero sequence current mutual inductor (5), the one end again with electric capacity (C9), (C8) a end, the anode of diode (D1), the negative electrode of diode (D2) connects, and be connected with amplifying circuit (7), the other end of its other end and electric capacity (C9), one end of electric capacity (C10), the negative electrode of diode (D1), the anode of diode (D2), power supply+2.5V, amplifying circuit (7) connects, electric capacity (C8) and other end ground connection (C10).

7, the residual current simulation test device that is used for according to claim 1, it is characterized in that described amplifying circuit (7) is by operational amplifier (N3A), (N3B), resistance (R8)～(R16), electric capacity (C11)～(C14) is formed, one end of resistance (R8) is connected with sample circuit (6), the other end and resistance (R10), (R11) a end, one end of electric capacity (C11) connects, the other end of resistance (R10) is connected with 2 pin of operational amplifier (N3A), the other end of the other end of resistance (R11) and electric capacity (C11), 1 pin of operational amplifier (N3A), resistance (R12), (R13) a end connects, the other end of resistance (R12) is connected with an end of electric capacity (C12), and be connected with microprocessing unit (1), one end of resistance (R9) is connected with 3 pin of operational amplifier (N3A), another termination power+2.5V and sample circuit, one end of the other end of resistance (R13) and resistance (R15), one end of electric capacity (C13), 6 pin of operational amplifier (N3B) connect, the other end of the other end of resistance (R15) and electric capacity (C13), 7 pin of operational amplifier (N3B), one end of resistance (R16) connects, the other end of resistance (R16) is connected with an end of electric capacity (C14), and be connected with microprocessing unit (1), one end of resistance (R14) is connected with 5 pin of operational amplifier (N3B), another termination power+2.5V, electric capacity (C12), (C14) the other end, 4 pin ground connection of operational amplifier (N3A), 8 pin of operational amplifier (N3A) connect power supply (VCC).

8, the residual current simulation test device that is used for according to claim 1, it is characterized in that described control circuit (8) is made up of resistance (R17), (R18), electric capacity (C15), triode (VT1), one end of resistance (R17) is connected with microprocessing unit (1), the other end is connected with an end of electric capacity (C15), an end of resistance (R18), the base stage of triode (VT1), the grounded emitter of the other end of the other end of electric capacity (C15) and resistance (R18), triode (VT1), the collector electrode of triode (VT1) is connected with actuator (9).

9, the residual current simulation test device that is used for according to claim 1, it is characterized in that described actuator (9) is made up of diode (D4), tripping coil (L), one termination power (VCC) of the negative electrode of diode (D4) and tripping coil (L), the anode of diode (D4) is connected with the other end of tripping coil (L), control circuit (8).