CN103078291A - 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 intelligence residue electric leakage sudden change guard method

Technical field

The present invention relates to a kind of intelligence residue electric leakage sudden change guard method.

Background technology

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

Existing residual current circuit breaker is fixing residual current gear, reaches the gear value in the circuit, and residual current circuit breaker moves.

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

Summary of the invention

The present invention seeks to provides a kind of intelligence residue electric leakage sudden change guard method for the defective that prior art exists.

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

A kind of intelligence residue of the present invention electric leakage sudden change guard method is as follows:

In time t, adopt current transformer to gather n circuit residual current I _{Δ r}, with n the circuit residual current I that gathers _{Δ r}Export the microprocessor residual current I that obtains suddenling change to _{Δ t}The residual current that collects when the 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 that collects when the Real-Time Monitoring circuit is less than 0.5I _{Δ t}, then be failure to actuate.

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

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

I wherein _{Δ i}Be real-time residual current.

N circuit residual current I with the current transformer collection _{Δ r}Through exporting microprocessor to after the filtering and amplifying circuit amplification filtering.

The real surplus current value is undergone mutation in the circuit of the present invention, and residual current circuit breaker in time moves, protection equipment or people.

Description of drawings

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

Embodiment

As shown in Figure 1, a kind of intelligence residue of the present invention electric leakage sudden change guard method is as follows:

In time t, adopt current transformer to gather n circuit residual current I _{Δ r}, with n the circuit residual current I that gathers _{Δ r}Export the microprocessor residual current I that obtains suddenling change to _{Δ t}The residual current that collects when the 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 that collects when the Real-Time Monitoring circuit is less than 0.5I _{Δ t}, then be failure to actuate.

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

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

I wherein _{Δ i}Be real-time residual current.

N circuit residual current I with the current transformer collection _{Δ r}Through exporting microprocessor to after the filtering and amplifying circuit amplification filtering.

The above only is the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment the present invention is had been described in detail, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. intelligence residue electric leakage sudden change guard 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}, with n the circuit residual current I that gathers _{Δ r}Export the microprocessor residual current I that obtains suddenling change to _{Δ t}The residual current that collects when the 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 that collects when the Real-Time Monitoring circuit is less than 0.5I _{Δ t}, then be failure to actuate.

2. a kind of intelligence residue electric leakage sudden change guard method according to claim 1, residual current I is characterized in that suddenling change _{Δ t}Acquisition methods as follows:

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

I wherein _{Δ i}Be real-time residual current.

3. a kind of intelligence residue electric leakage sudden change guard method according to claim 1 is characterized in that n the circuit residual current I that current transformer is gathered _{Δ r}Through exporting microprocessor to after the filtering and amplifying circuit amplification filtering.