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Fast current protection method with channel applicable to distribution networks containing DGs

A technology of current protection and distribution network, applied in emergency protection circuit devices, electrical components, etc., to improve the reliability of power supply

Inactive Publication Date: 2009-11-04
SHANDONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art above, to provide a fast current protection method with channels based on traditional three-stage current protection and longitudinal protection, and to solve the problem of DG access to power distribution with flexible method steps. Problems behind the net for protection

Method used

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  • Fast current protection method with channel applicable to distribution networks containing DGs
  • Fast current protection method with channel applicable to distribution networks containing DGs
  • Fast current protection method with channel applicable to distribution networks containing DGs

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0047] figure 1 Among them, the channel-based fast current protection method suitable for the distribution network with DG includes the following steps:

[0048] 1). Start, enter the normal operation step, judge whether the long-distance jump function is put into the step through the protection device, if it is and receive the long-distance jump signal, then proceed to the step of sending a trip command;

[0049] 2). Then judge whether the reclosing step is put into operation. If the reclosing step is put into the reclosing step, the reclosing step is carried out. After the reclosing step, the normal operation step is returned, and if the reclosing step is not put into, the normal operation step is returned;

[0050] 3). If the step 1) does not put into the long-jump function step or does not receive the long-jump signal, then enter the step of judging whethe...

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Abstract

The invention relates to a fast current protection method with a channel applicable to distribution networks containing DGs, which adopts directional current protection, only actuates the protection when the forward fault occurs, and can set the realization of the switching of the functions of the conventional directional current protection with three stages and the fast current protection with the channel by setting control words. When no channel is selected, a working mode is the conventional directional current protection with three stages, namely stage I is instantaneous current fast tripping protection, and stage II and stage III are constant time lag fast tripping protection; and when the channel is selected, the working mode is the fast current protection with the channel, namely stage I and stage II are used for starting fast current protection, and stage II and stage III are still the constant time lag fast tripping protection. The method supports the function of commanding direct tripping, and can receive remote tripping signals sent by other protection devices to realize direct tripping. The method configures a flexible three-phase one-shot auto-reclosing function which is used for removing transient fault, and can realize direct fast re-closing, non-voltage re-closing of check lines or synchronism check re-closing. The protection has flexible configuration, and can well adapt to the distribution networks containing the DGs.

Description

technical field [0001] The invention relates to the field of relay protection for power system distribution lines, in particular to a fast current protection method with channels suitable for distribution networks containing DG. Background technique [0002] At present, due to the shortage of conventional energy and increasingly severe environmental problems, the development and utilization of renewable energy has received unprecedented attention, and the corresponding distributed power generation technology has been developed rapidly. In order to facilitate grid connection, distributed generation (DG) often chooses to connect to the distribution network locally. my country's medium and low voltage distribution network is mainly ungrounded neutral point (or grounded through arc suppressing coil), single-side power supply, radial power supply network, generally equipped with traditional three-stage current protection, namely: instantaneous current quick-break protection, timi...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 高厚磊田佳杜强武志刚刘淑敏
Owner SHANDONG UNIV
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