Power distribution network boundary protection method based on secondary-side wave trapper

A boundary protection and wave arrester technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of complex cost of the primary system of the power grid, achieve good dynamic response, and avoid saturation.

Inactive Publication Date: 2015-01-14
TONGJI UNIV
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Problems solved by technology

[0005] Aiming at the problem that the power distribution network adopts the traditional method to realize boundary protection, the primary system of the power grid will be too complicated and the cost will be increased, and proposes a new technical solution that does not change the structure of the power line

Method used

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  • Power distribution network boundary protection method based on secondary-side wave trapper
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  • Power distribution network boundary protection method based on secondary-side wave trapper

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Embodiment Construction

[0027] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] The schematic diagram of the structure of the distribution network boundary protection method based on the secondary side wave trap is as follows: figure 1 as shown, figure 2 Yes figure 1 A zoomed-in view of the medium trap Trap3.

[0029] The secondary side of the special current transformer at the boundary of each line section of the distribution network is connected in series with the wave trap to form the difference of the fault traveling wave signal of the section, and provide boundary conditions for distinguishing the traveling wave signal inside and outside the section. like figure 1 As shown, the protection system configuration of the NP segment is taken as an example for illustration. Each switch of the actual power grid is generally equipped with two sets of iron-core current transformers for protection a...

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Abstract

The invention relates to a protection method of a power system, and in particular relates to a method for achieving full-circuit quick-action protection by changing circuit boundary parameters through a secondary-side wave trapper. The method aims at the problem that a time limit matched-type relay based on power frequency component can not meet the requirements of network rapidity and selection, a current transformer specially for transient state protection is additionally arranged at a power distribution circuit boundary switch part; a wave trapper is connected in series to the secondary side, that is, an 'equivalent wave trapper' is connected to the power distribution circuit boundary part, refraction coefficients and reflection coefficients of the circuit boundary are changed by utilizing the secondary wave trapper, an attenuation effect on a fault traveling wave in a wave trapping frequency band is formed, the aim that a fault section is identified automatically by protection devices at each boundary part according to fault traveling wave differences is achieved, and the reliability of the transient state protection device is improved. According to the invention, on the basis that the original wiring of the power distribution circuit is not changed, the differences of fault traveling waves in and out of a section are intensified, and the full-circuit quick-action protection of a power distribution network is realized.

Description

technical field [0001] The invention relates to a protection method of an electric power system, in particular to a method for realizing rapid protection of the entire line by using a secondary wave trap to change line boundary parameters. Background technique [0002] At present, the full-line quick protection of the distribution network is mainly realized based on the principle of power frequency components, and the transient protection is mainly applied in the small current grounding line selection device. Obviously, the protection principle based on transients also provides a new idea for the optimization and improvement of the distribution network relay protection scheme, and provides the possibility to realize the boundary protection of the distribution network with full-line quick action. [0003] The basic condition for the establishment of boundary protection is that the transient components have obvious differences on both sides of the boundary of the fault section...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 牟龙华张鑫周伟
Owner TONGJI UNIV
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