Intelligent load-limiting universal circuit breaker

Abstract

The invention discloses an intelligent load-limiting universal circuit breaker, which comprises a current transformer, a rectification filter circuit, a step-down circuit, a single-chip microcomputer, a single-port tripping module, a digital signal type current detection circuit, a voltage detection circuit, and a residual current detection circuit , signal preprocessor, A / D converter, and an analog signal current detection circuit. Compared with the prior art, the present invention has the following remarkable effects: (1) Since the present invention adds an analog signal type current detection circuit to realize a short-circuit fault fast protection scheme, the response time of the analog circuit is extremely short, and its power-on time is 5 microseconds (2) The power supply part adopts the current power supply mode of the frame circuit breaker itself, which improves the safety and reliability of the circuit in operation, and especially important is to greatly reduce various strong interferences from the low-voltage power grid when the high-voltage power supply is used; (3 ) The present invention uses a four-port trip module, which can greatly improve its anti-interference ability.

Description

technical field

[0001] The invention relates to the technical field of circuit breakers, in particular to an intelligent load-limiting universal circuit breaker. Background technique

[0002] The existing circuit breaker consists of a current transformer, a rectification filter circuit, a step-down circuit, a single-chip microcomputer, a single-port tripping module, a digital signal current detection circuit, a voltage detection circuit, a residual current detection circuit, a signal preprocessor, A / D Converter composition. When working, the current transformer winding passing through the phase line outputs the induced current, which is rectified and filtered by the rectifier filter circuit and stepped down by the step-down circuit, and then input to the single chip microcomputer, and the signals of the digital signal current detection circuit, voltage detection circuit, and residual current detection circuit are respectively The input signal is pre-processed and converted ...

Examples

Embodiment Construction

[0019] The intelligent load-limiting universal circuit breaker of the present invention is further described in detail through the following embodiments.

[0020] see Figure 1~4 As shown, an intelligent load-limiting universal circuit breaker includes an iron-core current transformer 15, a rectification filter circuit 14, a step-down circuit 12, a single-chip microcomputer 7, a single-port tripping module 10, a digital signal current detection circuit 2, a voltage Detection circuit 3, residual current detection circuit 4, signal preprocessor 5, A / D converter 6, input keyboard 8, liquid crystal display 9, the induced current signal output by the secondary winding of the core current transformer 15 passing through the phase line After being rectified and filtered by the rectifying and filtering circuit 14 and the voltage reduced by the step-down circuit 12, it is output to the first input terminal 201 of the single-chip microcomputer 7, and the signals output by the digital sig...

technical field

[0001] The invention relates to the technical field of circuit breakers, in particular to an intelligent load-limiting universal circuit breaker. Background technique

[0002] The existing circuit breaker consists of a current transformer, a rectification filter circuit, a step-down circuit, a single-chip microcomputer, a single-port tripping module, a digital signal current detection circuit, a voltage detection circuit, a residual current detection circuit, a signal preprocessor, A / D Converter composition. When working, the current transformer winding passing through the phase line outputs the induced current, which is rectified and filtered by the rectifier filter circuit and stepped down by the step-down circuit, and then input to the single chip microcomputer, and the signals of the digital signal current detection circuit, voltage detection circuit, and residual current detection circuit are respectively The input signal is pre-processed and converted ...

Examples

Embodiment Construction

[0019] The intelligent load-limiting universal circuit breaker of the present invention is further described in detail through the following embodiments.

[0020] see Figure 1~4 As shown, an intelligent load-limiting universal circuit breaker includes an iron-core current transformer 15, a rectification filter circuit 14, a step-down circuit 12, a single-chip microcomputer 7, a single-port tripping module 10, a digital signal current detection circuit 2, a voltage Detection circuit 3, residual current detection circuit 4, signal preprocessor 5, A / D converter 6, input keyboard 8, liquid crystal display 9, the induced current signal output by the secondary winding of the core current transformer 15 passing through the phase line After being rectified and filtered by the rectifying and filtering circuit 14 and the voltage reduced by the step-down circuit 12, it is output to the first input terminal 201 of the single-chip microcomputer 7, and the signals output by the digital sig...

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