CN101079545A - An automated re-close brake of high-voltage transmission line - Google Patents

Abstract

The invention discloses a self recluse of high-pressure transmitting circuit in the electric system relay protective and automating domain, which is characterized by the following: when two-phase is short circuit, one-phase circuit is skipped to proceed one-phase coincidence at instantaneous accident; if the judgment is permanent accident, three-phase is skipped immediately. The invention is beneficial to improve electric supplying reliability and electric system stability not to impact and damage the equipment during permanent accident, which can restore normal operation at instantaneous accident.

Description

A kind of automated re-close brake of high-voltage transmission line

Technical field:

The present invention relates to relay protection of power system and automatic field, be specifically related to a kind of automated re-close brake of high-voltage transmission line.

Background technology:

Automatic reclosing is used widely on ultra-high-tension power transmission line, and it plays a part to improve power supply reliability and stability of power system.The automatic reclosing mode that has proposed so far and used on transmission line has three-phase automatic reclosing and single phase autoreclosing.Extensively adopt comprehensive automatic reclosing on China's ultra-high-tension power transmission line; comprising three-phase automatic reclosing and single phase autoreclosing; it is when single phase ground fault; a phase that breaks down by the protective relaying device tripping; carry out single-pole reclosing then; when phase-to phase fault, the tripping three-phase carries out the three-phase reclosing then.

The weak point of above-mentioned reclosing is: when two-phase short-circuit fault, the tripping three-phase is unfavorable for the stable operation of safe power supply and system.

Summary of the invention:

The invention provides a kind of automated re-close brake of high-voltage transmission line, with overcome that prior art exists when the two-phase short-circuit fault, the tripping three-phase is unfavorable for the problem of safe power supply and system stable operation.

For overcoming above-mentioned defective, the technical solution used in the present invention is:

A kind of automated re-close brake of high-voltage transmission line, its special character is: when line to line fault, only jump the phase circuit of two faults in mutually, and carry out single-phase coincidence when being judged to be transient fault, as be judged to be permanent fault, then tripping three-phase immediately; The criterion that is judged to transient fault is shown below,

$\left|\stackrel{\&CenterDot;}{U_L}\right|<\frac{1}{K_K}\left|\stackrel{\&CenterDot;}{U_{\mathrm{\&phi;}}}\right|---\left(1\right)$

In the formula,

The voltage that-disconnection is gone up mutually; The specified phase voltage of-circuit; K _K-safety factor.

Compared with prior art, advantage of the present invention is as follows:

1, line to line fault tripping one phase of the present invention helps improving power supply reliability and stability of power system;

2, the present invention adds the permanent failure judgement function, can prevent to coincide with permanent fault, in order to avoid system is impacted and damage equipment, but when transient fault, can recover normal operation rapidly again;

3, the present invention is easy to realize in Microcomputer Protection;

4, the present invention can further improve the economic benefit that automatic reclosing produces.

Embodiment:

Principle of the present invention is: when line to line fault, only jump the phase circuit of two faults in mutually, and carry out single-phase coincidence when being judged to be transient fault.

That is to say, under two-phase short-circuit fault, only disconnect the phase circuit of two faults in mutually, when being judged to be transient fault, overlapping automatically and disconnect phase, recover normal power supply; If when being judged to be permanent fault, then jump three-phase immediately.The separate of line to line fault can be determined by conventional phase selection element.

The criterion that is judged to transient fault as the formula (1),

$\left|\stackrel{\&CenterDot;}{U_L}\right|<\frac{1}{K_K}\left|\stackrel{\&CenterDot;}{U_{\mathrm{\&phi;}}}\right|---\left(1\right)$

In the formula, The voltage that-disconnection is gone up mutually; The specified phase voltage of-circuit; K _K-safety factor.

Claims (1)

1, a kind of automated re-close brake of high-voltage transmission line is characterized in that: when line to line fault, only jump the phase circuit of two faults in mutually, and carry out single-phase coincidence when being judged to be transient fault, as be judged to be permanent fault, then tripping three-phase immediately; The criterion that is judged to transient fault is shown below,

$\left|{\stackrel{\&CenterDot;}{U}}_L\right|<\frac{1}{K_K}\left|{\stackrel{\&CenterDot;}{U}}_{\mathrm{\&phi;}}\right|---\left(1\right)$

In the formula,

The voltage that-disconnection is gone up mutually;

The specified phase voltage of-circuit; K _K-safety factor.