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Method for overcoming influence of outgoing current on busbar differential protection

A busbar differential protection and current-drawing technology, applied in the direction of measuring current/voltage, emergency protection circuit devices, measuring electricity, etc. The effect of sensitivity

Active Publication Date: 2015-03-04
STATE GRID CORP OF CHINA +2
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Problems solved by technology

For the conventional ratio differential algorithm, this current has no effect on the differential current of the large difference, but increases the braking current, which leads to a decrease in the sensitivity of the braking criterion of the large difference ratio. The whole set of bus differential protection caused by

Method used

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  • Method for overcoming influence of outgoing current on busbar differential protection
  • Method for overcoming influence of outgoing current on busbar differential protection
  • Method for overcoming influence of outgoing current on busbar differential protection

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0044] like figure 2 , the present invention provides a method to overcome the influence of the drawn current on the differential protection of the busbars. For the double busbar connection mode, it is not necessary to reduce the braking coefficient during separate operation, and the busbar differential protection can be adaptively increased in the case of the drawn current. Sensitivity in the case of internal faults, while ensuring reliability in external faults.

[0045] The method to overcome the effect of current draw on busbar differential protection includes the following steps:

[0046] Step 1: Acquisition and processing of branch current signals;

[0047] Step 2: Select the faulty bus, and determine the maximum amplitude branch current in the branches connected to the faulty bus;

[0048] Step 3: Calculate the differential current and braking curr...

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Abstract

The invention provides a method for overcoming the influence of outgoing current on busbar differential protection. The method comprises the steps of acquiring and processing a branch current signal; selecting a faulted bus, and determining the branch current with the maximum magnitude from branches connected with the faulted bus; calculating differential current and braking current of a large differential element, and determining whether the large differential element acts. According to the method for overcoming the influence of the outgoing current on the busbar differential protection, the double-bus connecting mode is avoided the reduction of the braking coefficient during splitting running; the sensitivity of the busbar differential protection for the internal fault can be adaptability improved in case of outgoing current; meanwhile, the reliability under external fault can be ensured.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a method for overcoming the influence of drawn current on busbar differential protection. Background technique [0002] Busbar protection usually adopts the differential protection principle. Differential protection is the most widely used due to its simple principle and many advantages of not being affected by oscillation. However, in practical applications, the current drawn by faults in the busbar differential protection zone has become the main factor affecting its safety and reliability. The invention proposes a countermeasure for overcoming the influence of the drawn current in the differential protection of the busbar. [0003] For the busbar protection of the double busbar connection type, it is usually equipped with large difference and small difference elements. The large difference protection is used to judge whether a faul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22G01R31/50
CPCG01R19/2513H02H7/28G01R31/50H02H7/22G01R19/25G06F1/28
Inventor 杜丁香柳焕章周泽昕王兴国
Owner STATE GRID CORP OF CHINA
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