CN2777566Y

CN2777566Y - Tester for circuit breaker performance of preventing error releasing

Info

Publication number: CN2777566Y
Application number: CN 200420103374
Authority: CN
Inventors: 罗全文
Original assignee: QINGTIAN COMPLETE EQUIPMENT ENGINEERING Co Ltd
Current assignee: QINGTIAN COMPLETE EQUIPMENT ENGINEERING Co Ltd
Priority date: 2004-12-31
Filing date: 2004-12-31
Publication date: 2006-05-03
Anticipated expiration: 2014-12-31

Abstract

The utility model discloses a performance testing device capable of preventing the mistaken trip of a circuit breaker, which comprises a large power AC/DC direct current switching power supply, a charge controlling switch, an energy storing circuit, a thyristor triggering circuit, a discharge controlling switch, an RL discharging loop and a test waveform sampling circuit, wherein the large power AC/DC direct current switching power supply charges the energy storing circuit through the charge controlling switch, and the test waveform sampling circuit is connected between the energy storing circuit and the discharge controlling circuit; the thyristor triggering circuit is connected with the discharge controlling switch, and the energy storing circuit is connected with the RL discharging loop through the discharge controlling switch and outputs standard surge current. The utility model is in accordance with the requirements proposed by the 1008-1IEC1996 standard of IEC standard, can verify the mistaken tripping prevention performance of the circuit breaker under the surge current, which is an important index parameter and facilitates the compulsory 3C certification of the circuit breaker.

Description

Isolating switch prevents the false tripping performance test apparatus

Technical field

The utility model relates to a kind of isolating switch and prevents the false tripping performance test apparatus

Background technology

Isolating switch (RCCB) product simulated at the big pulse current of thunderbolt scurry under the interference, do not produce the device of false tripping action test, do not have certification authority and manufacturer to produce this test unit at present at home yet.According to IEC standard 1008-1IEC1996 standard institute requirement, checking surge electricity pours down and prevents that the false tripping performance from then being an important indicator parameter of isolating switch (RCCB), particularly seems even more important today that isolating switch (RCCB) is forced to carry out the 3C authentication.

The utility model content

The purpose of this utility model is to provide a kind of and verifies that under surge current isolating switch prevents the test unit of false tripping performance.

The purpose of this utility model can realize by following technical measures: comprise high-power AC/DC direct-current switch power supply, charging control switch, tank circuit, thyristor gating circuit, discharge control switch, RL discharge loop and test waveform sample circuit, high-power AC/DC direct-current switch power supply charges to tank circuit through charging control switch, be connected the test waveform sample circuit between tank circuit and the discharge control switch, thyristor gating circuit connects discharge control switch, and tank circuit connects RL discharge loop outputting standard surge current through discharge control switch.

The utility model also comprises the output change poles to circuit, and the output change poles connects the output terminal of RL discharge loop to circuit.

The utility model meets IEC standard 1008-1IEC1996 standard institute requirement, can verify that the surge electricity pours down isolating switch and prevents this important indicator parameter of false tripping performance, provides convenience for isolating switch (RCCB) being forced to carry out the 3C authentication.

Description of drawings

Fig. 1 is a theory diagram of the present utility model;

Fig. 2 is the circuit diagram of the utility model embodiment

Embodiment

As shown in Figure 1, by high-power AC/DC direct-current switch power supply, charging control switch, tank circuit, thyristor gating circuit, discharge control switch, the RL discharge loop, the output change poles is to circuit and test waveform sample circuit, high-power AC/DC direct-current switch power supply charges to tank circuit through charging control switch, be connected the test waveform sample circuit between tank circuit and the discharge control switch, thyristor gating circuit connects discharge control switch, tank circuit connects the RL discharge loop through discharge control switch, and the output change poles connects the output terminal output surge current of RL discharge loop to the circuit-breaker testing sample to circuit.

As shown in Figure 2, according to IEC standard 1008-1IEC1996 standard institute requirement, isolating switch checking surge current peak value is 3000A ± 10%, and leading edge time is 8us ± 20%, and the duration is 20us ± 20%.Civil power AC220V converts the adjustable direct supply of 200V-400V to through high-power AC/DC Switching Power Supply.Direct supply is charged through the storage capacitor C1 of 470 Ω resistance R 1 to 330Uf/450V by charging control switch KA1 control.After capacitor C 1 charging is finished, charging control switch KA1 disconnects, the charging circuit open circuit, the normally closed contact of charging control switch KA1 is connected, controllable silicon SRC produces trigger current, be the trigger electrode of 12V DC voltage by 33 Ω resistance R, 2 inflow controllable silicon SRC, controllable silicon SRC conducting, storage capacitor C1 powers on and flows to the discharge loop discharge.Big surge current determines the duration and the peak value of this electric current by the loop resistance R3 in the discharge loop, and inductance L makes the surge current rising front satisfy the leading edge time of standard-required.The KM1 of polarity switch control circuit, KM2 connect in turn, make the surge current reverse of polarity that outputs to sample, and to realize reverse of polarity function, the surge current of the controlled reverse of polarity prevents the false tripping test to the circuit-breaker testing sample that inserts.Test current is obtained waveform and is shown and record by digital oscilloscope on sampling resistor R4.

Claims

1, a kind of isolating switch prevents the false tripping performance test apparatus, it is characterized in that: comprise high-power AC/DC direct-current switch power supply, charging control switch, tank circuit, thyristor gating circuit, discharge control switch, RL discharge loop and test waveform sample circuit, high-power AC/DC direct-current switch power supply charges to tank circuit through charging control switch, be connected the test waveform sample circuit between tank circuit and the discharge control switch, thyristor gating circuit connects discharge control switch, and tank circuit connects RL discharge loop outputting standard surge current through discharge control switch.

2, isolating switch according to claim 1 prevents the false tripping performance test apparatus, it is characterized in that: also comprise the output change poles to circuit, the output change poles connects the output terminal of RL discharge loop to circuit.