CN103078291B - Intelligent residual current leakage sudden-change protection method - Google Patents

Abstract

The invention discloses an intelligent residual current leakage sudden-change protection method. The method comprises the following steps of collecting residual current I (delta x) of n lines by a current transformer within a time t, and outputting the collected residual current I (delta x) of the n lines to a microprocessor to obtain sudden-change residual current I (delta t); when the collected residual current is greater than 0.9I (delta t) during real-time line monitoring, enabling the microprocessor to drive a circuit breaker to act respectively by a tripping driving circuit and a magnetic flux converter; and when the collected residual current is smaller than 0.5I (delta t) during real-time line monitoring, enabling the circuit breaker not to act. The method has the advantage that when the actual residual current value in the line suddenly changes, the residual current circuit breaker timely acts to protect equipment or persons.

Description

A kind of intelligent residual current leakage sudden-change protection method

Technical field

The present invention relates to a kind of intelligent residual current leakage sudden-change protection method.

Background technology

Season and weather weather reason of changes cause circuit residual current sudden change value not reach residual current gear settings, but reach the gear value of mutation current setting, make the timely disjunction proterctive equipment of residual current circuit breaker or personal safety.

Existing residual current circuit breaker is fixing residual current gear, reaches gear value, residual current circuit breaker action in circuit.

If residual current circuit breaker residual current gear arranges too high, occur not reaching the sudden change residual current arranging gear operating value in circuit, residual current circuit breaker is failure to actuate, can not proterctive equipment or people in time.

Summary of the invention

The defect that the present invention seeks to exist for prior art provides a kind of intelligent residual current leakage sudden-change protection method.

The present invention for achieving the above object, adopts following technical scheme:

A kind of intelligent residual current leakage sudden-change protection method of the present invention is as follows:

In time t, adopt current transformer to gather n circuit residual current I _{Δ r}, by n the circuit residual current I gathered _{Δ r}export microprocessor to and obtain sudden change residual current I _{Δ t}; The residual current collected when Real-Time Monitoring circuit is greater than 0.9I _{Δ t}, then microprocessor drives circuit breaker work through dropout drive circuit, magnetic flow convertor successively; The residual current collected when Real-Time Monitoring circuit is less than 0.5I _{Δ t}, be then failure to actuate.

Sudden change residual current I _{Δ t}acquisition methods as follows:

$I_{\mathrm{\Δt}}=I_{\mathrm{\Δi}}-\frac{\left(\underset{x=1}{\overset{n}{\mathrm{\Σ}}}{I}_{\mathrm{\Δx}}\right)}{n};$

Wherein I _{Δ i}for real-time residual current.

By n the circuit residual current I that current transformer gathers _{Δ r}microprocessor is exported to after filtering and amplifying circuit amplification filtering.

In circuit of the present invention, real surplus current value is undergone mutation, the timely action of residual current circuit breaker, proterctive equipment or people.

Accompanying drawing explanation

Fig. 1: hardware configuration schematic diagram of the present invention.

Embodiment

As shown in Figure 1, a kind of intelligent residual current leakage sudden-change protection method of the present invention is as follows:

In time t, adopt current transformer to gather n circuit residual current I _{Δ r}, by n the circuit residual current I gathered _{Δ r}export microprocessor to and obtain sudden change residual current I _{Δ t}; The residual current collected when Real-Time Monitoring circuit is greater than 0.9I _{Δ t}, then microprocessor drives circuit breaker work through dropout drive circuit, magnetic flow convertor successively; The residual current collected when Real-Time Monitoring circuit is less than 0.5I _{Δ t}, be then failure to actuate.

Sudden change residual current I _{Δ t}acquisition methods as follows:

$I_{\mathrm{\Δt}}=I_{\mathrm{\Δi}}-\frac{\left(\underset{x=1}{\overset{n}{\mathrm{\Σ}}}{I}_{\mathrm{\Δx}}\right)}{n};$

Wherein I _{Δ i}for real-time residual current.

By n the circuit residual current I that current transformer gathers _{Δ r}microprocessor is exported to after filtering and amplifying circuit amplification filtering.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (2)

1. an intelligent residual current leakage sudden-change protection method, is characterized in that described method is as follows:

In time t, adopt current transformer to gather n circuit residual current I _{Δ x}, by n the circuit residual current I gathered _{Δ x}export microprocessor to and obtain sudden change residual current I _{Δ t}; The residual current collected when Real-Time Monitoring circuit is greater than 0.9I _{Δ t}, then microprocessor drives circuit breaker work through dropout drive circuit, magnetic flow convertor successively; The residual current collected when Real-Time Monitoring circuit is less than 0.5I _{Δ t}, be then failure to actuate;

Sudden change residual current I _{Δ t}acquisition methods as follows:

$I_{\mathrm{\Δt}}=I_{\mathrm{\Δi}}-\frac{\left(\underset{x=1}{\overset{n}{\mathrm{\Σ}}}{I}_{\mathrm{\Δx}}\right)}{n};$

Wherein I _{Δ i}for real-time residual current.

2. a kind of intelligent residual current leakage sudden-change protection method according to claim 1, is characterized in that n the circuit residual current I gathered by current transformer _{Δ x}microprocessor is exported to after filtering and amplifying circuit amplification filtering.