Power converse determination method of longitudinal protection of double-circuit line of intelligent transformer station
A technology of intelligent substation and longitudinal protection, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of improper operation of longitudinal protection, affecting the reliability of double-circuit line power supply, and inability to distinguish in time.
Inactive Publication Date: 2015-10-28
NR ELECTRIC CO LTD +2
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Problems solved by technology
[0002] At present, the longitudinal protection is still widely used in the transmission lines of the power system. With the gradual increase of the operating speed of the circuit breaker, the original power reverse logic designed according to the operating speed of the circuit breaker has gradually exposed the problem that it cannot be judged in time. When it is cut off, it may cause incorrect operation of the longitudinal protection and affect the power supply reliability of the double-circuit line
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[0014] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0015] The purpose of the present invention is to provide a method for judging the power reversal of the longitudinal protection of the double-circuit line of the intelligent substation. When the power reversal occurs in the double-circuit line, the longitudinal protection can correctly judge the power reversal and effectively prevent the longitudinal protection from being incorrect. Action, improve power supply reliability.
[0016] The longitudinal protection of the main line uses the current and voltage information of the main line to calculate the forward direction information of the longitudinal protection, combined with the forward direction information of the longitudinal protection of the adjacent line received through the GOOSE network, the longitudinal protection of the main line acts in the forward direction and the longitudinal p...
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The invention discloses a power converse determination method of longitudinal protection of a double-circuit line of an intelligent transformer station. The method comprises: (1), longitudinal protection positive direction information sent by an adjacent line protection device is received by a GOOSE communication network; (2), a local line protection device calculates positive direction information of local line longitudinal protection according to local line electric quantity information; and (3), the received adjacent line protection positive direction is widened after preset time and motion is still carried out and motion is carried out by the local line longitudinal protection positive direction, and thus the local line longitudinal protection is determined to be in a power converse state. The method has the following beneficial effects: the local line positive direction information and adjacent line protection positive direction information are combined for longitudinal protection and the power converse can be determined effectively; and thus reliability of the power converse determination is improved.
Description
technical field [0001] The invention relates to a power grid protection technology, in particular to a method for judging the power reversal of the longitudinal protection of double-circuit lines in an intelligent substation. Background technique [0002] At present, the longitudinal protection is still widely used in the transmission lines of the power system. With the gradual increase of the operating speed of the circuit breaker, the original power reverse logic designed according to the operating speed of the circuit breaker has gradually exposed the problem that it cannot be judged in time. When it is cut off, it may cause incorrect operation of the longitudinal protection and affect the power supply reliability of the double-circuit line. [0003] With the wide application of intelligent station technology, it becomes more and more convenient to obtain relevant information on adjacent separation protection through the GOOSE network, which makes it possible to comprehen...
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IPC IPC(8): H02H7/26
Inventor 赵青春朱晓彤沈军谢华
Owner NR ELECTRIC CO LTD