CN207541169U - A kind of electric fireproof current-limiting type protector hookup - Google Patents

Abstract

The utility model discloses a test circuit for an electric fire-proof current-limiting protector, which comprises a short-circuit protection test circuit and an overload protection test circuit; the short-circuit protection test circuit comprises a voltage source, a circuit breaker, a sample, a resistive load, an oscilloscope and a power electronic switch, the voltage source, circuit breaker, sample, and resistive load are connected in series, the oscilloscope is connected in parallel with the resistive load, and the power electronic switch is connected in parallel with the sample; the overload protection test circuit includes a sample , clamp-type ammeter, voltage source, resistive load and circuit breaker, the sample, clamp-type ammeter, voltage source, resistive load and circuit breaker are connected in parallel. The utility model tests the short-circuit protection performance of the electrical fire-proof current-limiting protector when a short-circuit occurs under different phase conditions by controlling the instantaneous phase angle of the short-circuit, that is, through the short-circuit that occurs at a phase angle of 0° and 180°, the electrical fire-proof current-limiting protector is tested respectively. Protective performance of the protector. Comprehensive testing and measurement of pyrolytic particle electrical fire monitoring detectors.

Description

A test circuit for electrical fire-proof current-limiting protector

technical field

The utility model relates to a test circuit, in particular to a test circuit for an electric fire-proof current-limiting protector.

Background technique

As an electrical fire protection product, the electrical fire-proof current-limiting protector can realize microsecond-level current-limiting protection for electrical short-circuits, and completes the current-limiting before the current generated by the short-circuit reaches the short-circuit current, thereby greatly reducing The continuous arcing and ignition of combustible materials can cause fire accidents. Testing the electrical fire-proof current-limiting protector is an important technical means to ensure the reliable operation of the product.

In the existing test method, only randomly simulate short-circuit faults in the protected circuit, and observe the current of the protected circuit through an oscilloscope for testing.

Since the existing technology uses the method of randomly generating short-circuit faults, the phase relationship of the current at the short-circuit moment is not tested, and the breaking time of the electrical fire-proof current-limiting protector is related to the phase of the short-circuit current. Therefore, random simulated short-circuit tests cannot fully test and measure pyrolytic particle-type electrical fire monitoring detectors.

Utility model content

In order to solve the above-mentioned shortcomings of the prior art, the utility model provides a test circuit for an electric fire-proof current-limiting protector.

The above purpose of the utility model is achieved through the following technical solutions: a test circuit for an electrical fire-proof current-limiting protector, including a short-circuit protection test circuit and an overload protection test circuit;

The short-circuit protection test circuit includes a voltage source, a circuit breaker, a sample, a resistive load, an oscilloscope and a power electronic switch, the voltage source, the circuit breaker, the sample, and the resistive load are connected in series, and the oscilloscope is connected in parallel with the resistive load , the power electronic switch is connected in parallel with the sample;

The overload protection test circuit includes a sample, a clamp-type ammeter, a voltage source, a resistive load and a circuit breaker, and the sample, a clamp-type ammeter, a voltage source, a resistive load and a circuit breaker are connected in parallel.

Compared with the prior art, the utility model has the advantages that: the utility model tests the short-circuit protection performance of the electrical fire-proof current-limiting protector when a short-circuit occurs under different phase conditions by controlling the instantaneous phase angle of the short-circuit, that is, through 0° and 180° For the short circuit that occurs at the phase angle, test the protection performance of the electrical fire-proof current-limiting protector respectively. Comprehensive testing and measurement of pyrolytic particle electrical fire monitoring detectors.

Description of drawings

Fig. 1 is a schematic diagram of a short circuit protection test circuit in the utility model.

Fig. 2 is a schematic diagram of the overload protection test circuit in the utility model.

Detailed ways

Below in conjunction with embodiment the utility model is described in further detail.

A test circuit for an electric fire-proof current-limiting protector of the utility model includes a short-circuit protection test circuit and an overload protection test circuit;

The short-circuit protection test circuit includes a voltage source GR, a circuit breaker S1, a sample TR, a resistive load R, an oscilloscope TR and a power electronic switch S2, and the voltage source GR, a circuit breaker S1, a sample TR, a resistive load R In series, the oscilloscope CR is connected in parallel with the resistive load R, and the power electronic switch S2 is connected in parallel with the sample TR;

The overload protection test circuit includes a sample TR, a clamp-type ammeter A, a voltage source GR, a resistive load R and a circuit breaker S, and the sample TR, a clamp-type ammeter A, a voltage source GR, a resistive load R and a Circuit breakers S are connected in parallel.

The method of the short-circuit protection test in the utility model is: connect the samples as shown in Figure 1, operate the power electronic switch S2 to be in the conduction state, close the circuit breaker S1, adjust the resistive load R, monitor the current of the protected circuit, respectively Cut off the power electronic switch S2 at the phase angle of 0° and 180°, record and observe the voltage waveform at both ends of the resistive load R through the oscilloscope CR, and record the short-circuit protection current action value, short-circuit protection time and current-limiting time of the sample.

The method of the overload protection test in the utility model is: connect the samples as shown in Figure 2, close the circuit breaker S, adjust the resistive load R, make the current value of the protected circuit 120% of the rated current value, observe the test In the sample state, record the sample overload protection time.

The specific implementation above is just an example, and it is for those skilled in the art to better understand this patent, and it cannot be understood as a limitation on the scope of this patent; as long as it is any equivalent change made according to the spirit disclosed by this patent or modifications, all fall within the scope of this patent.

Claims (1)

1. a kind of electric fireproof current-limiting type protector hookup, it is characterised in that：Including short-circuit protection hookup and excessively negative Lotus protection test circuit；

The short-circuit protection hookup includes voltage source, breaker, sample, resistive load, oscillograph and electronic power switch, The voltage source, breaker, sample, resistive load series connection, the oscillograph is in parallel with resistive load, the electronic power switch It is in parallel with sample；

The overload protection hookup includes sample, tong-type ammeter, voltage source, resistive load and breaker, the examination Sample, tong-type ammeter, voltage source, resistive load and breaker are in parallel.