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A 8-side transformer differential principle for avoiding CT parallel connection

A transformer and principle technology, applied in the field of differential protection principle of power system relay protection and eight-side transformer differential principle, can solve the problem that the differential protection cannot fully meet the protection configuration requirements, increase the protection CT unbalanced current, and cannot protect the configuration. And other issues

Inactive Publication Date: 2008-08-06
GUODIAN NANJING AUTOMATION
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] 1. Generally, the curing method is adopted, and the protection configuration cannot be flexibly configured.
[0004] 2. It can only be calculated up to six sides. If there are more than six sides, the general measure is to connect the CTs of the seventh and eighth sides to the front six sides, which increases the normal inflow protection. The unbalanced current of CT puts forward higher requirements for the setting of protection
In addition, if the differential protection operates, it is impossible to know exactly which side has the fault, which sets obstacles to timely troubleshooting
[0005] Therefore, the current differential protection cannot fully meet the protection configuration requirements of different wiring methods on site

Method used

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  • A 8-side transformer differential principle for avoiding CT parallel connection
  • A 8-side transformer differential principle for avoiding CT parallel connection
  • A 8-side transformer differential principle for avoiding CT parallel connection

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Embodiment Construction

[0045] Below in conjunction with accompanying drawing, the present invention is specifically introduced as follows:

[0046] When adopting the traditional proportional braking principle or the hyperbolic gradient differential principle, the present invention is applicable. figure 1 is the traditional proportional braking action characteristic diagram; figure 2 It is the characteristic diagram of the braking action with hyperbolic gradual change.

[0047] 1. Action equation:

[0048] (1) The action equation of the traditional proportional braking principle is:

[0049] I d > I q ; I z I g I d ...

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Abstract

The invention relates to an eight-side transformer differential principle for avoiding a CT from parallel connection, which is characterized in that class technology and object oriented technology in high-level languages are adopted in a protection configuration; the electric quantity calculated by transformer differential protection is enlarged to eight sides; in a configuration software, a two-side, a three-side, a four-side, a five-side, a six-side, a seven-side or an eight-side differential protection configuration is selected to avoid the CT from parallel connection. The invention enlarges the electric quantity calculated by transformer differential protection to eight sides, avoids the situation of the parallel connection of the CT, reduces the unbalanced current flowing into the CT of a protecting device in a normal condition and avoids the misoperation of differential protection; the class technology and object oriented technology in high-level languages are adopted in the protection configuration; the protection configuration can be selected in the configuration software, thereby well adapting to the requirements of the differential protection configuration of various connection modes on the spot.

Description

technical field [0001] The invention relates to the principle of differential protection for relay protection of electric power system, and in particular relates to a differential principle of an eight-side transformer which avoids parallel connection of CTs. The utility model belongs to the technical field of electric power automation. Background technique [0002] The transformer differential protection currently used has the following problems: [0003] 1. Generally, the curing method is adopted, and the protection configuration cannot be flexibly configured. [0004] 2. It can only be calculated up to six sides. If there are more than six sides, the general measure is to connect the CTs of the seventh and eighth sides to the front six sides, which increases the normal inflow protection. The unbalanced current of CT puts forward higher requirements for protection setting. In addition, if the differential protection operates, it is impossible to know exactly which side ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/045H02H3/26
Inventor 陆于平
Owner GUODIAN NANJING AUTOMATION
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