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A switch protection configuration table and table lookup method suitable for 10kv distribution network lines

A technology of protection configuration and switch position, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, circuit devices, etc.

Active Publication Date: 2019-09-27
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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  • Abstract
  • Description
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Problems solved by technology

[0004] The purpose of the present invention is, aiming at the problems existing in the protection of existing distribution network lines, the present invention proposes a switch protection configuration table and table look-up method suitable for 10kV distribution network lines

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  • A switch protection configuration table and table lookup method suitable for 10kv distribution network lines
  • A switch protection configuration table and table lookup method suitable for 10kv distribution network lines
  • A switch protection configuration table and table lookup method suitable for 10kv distribution network lines

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specific Embodiment approach

[0088] The distribution network line protection configuration of the present invention is based on the following principles:

[0089] For distribution network lines whose last protection period is less than 0.6s, the protection is divided into two levels.

[0090] The first-level protection is undertaken by the substation switch, and two-stage overcurrent protection is set: the period of overcurrent I is 0 seconds, and the current setting value is set according to the maximum short-circuit current at the place where the sub-section switch is avoided; the period of overcurrent II is 0.4 Seconds, the current setting is set by comprehensively considering CT matching, maximum load and wire carrying capacity.

[0091] The second-level protection is undertaken by the switch set on the line, and two-stage overcurrent protection is set: the time of stage I and stage II is 0 seconds and 0.2 seconds respectively, which are not greater than 0.8 times of the previous level of protection. ...

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Abstract

The invention discloses a switch protection configuration table suitable for a 10kV distribution network line and a table look-up method. The configuration table comprises arrangement of a second-level switch position and first-level protection setting calculation of two-level protection configuration, and arrangement of the second-level switch position and a third-level switch position and first-level protection setting calculation of three-level protection configuration. On the basis of a hierarchical protection configuration principle, parameter variations are divided into smaller ranges according to different wire models and running impedance of the distribution network line, a certain margin is preserved, each range is solved, and switch position configuration and a specific value ofsetting calculation of a corresponding line in each case are given, so that protection configuration of the distribution network line is greatly facilitated and a convenient and effective reference isprovided for protection configuration decision of the distribution network line.

Description

technical field [0001] The invention relates to a switch protection configuration table and a table look-up method suitable for 10kV distribution network lines, belonging to the technical field of distribution network protection. Background technique [0002] Distribution network line protection includes substation outlet switches, pole-mounted switches, ring network cabinets and other equipment installed on the line and their protection. However, in the actual application process, there are no regulations that can be used for these protections, and the existing standards do not provide a unified and specific configuration scheme. Therefore, the distribution network line protection configuration is often not effectively configured, and the phenomenon of protection mismatch (simultaneous tripping of the upper and lower level switches, tripping over the level, etc.) is very common, which seriously affects the reliability of line power supply and the user's power consumption ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/00
Inventor 郭亮范瑞祥李升健安义方旎邓才波刘蓓陈琛
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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