Step down transformer and relay protection method of middle low voltage side bus

A step-down transformer and relay protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of main protection refusal to operate, accident expansion, failure to automatically cut off, etc., and achieve the effect of shortening the action time limit and speeding up the cut-off speed

Inactive Publication Date: 2008-01-02
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that according to the current protection configuration method, when there is a fault in the bus bar on the medium and low voltage side of the transformer, or when the transformer has an internal fault but its main protection refuses to operate, it will take a long time to remove the fault.
In addition, in some cases, the protection range of the high-voltage side backup protection may not reach the low-voltage side busbar, so that the low-voltage side busbar only has a simple time-delayed overcurrent protection as the only protection. Once the protection refuses to operate, the fault cannot be automatically removed , will cause the accident to expand

Method used

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  • Step down transformer and relay protection method of middle low voltage side bus
  • Step down transformer and relay protection method of middle low voltage side bus

Examples

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Embodiment Construction

[0023] Provide a best embodiment of the present invention below in conjunction with accompanying drawing.

[0024] Take the 110kV step-down substation shown in Figure 1 as an example. This example only considers the case where there is only one transformer in the substation. For the common situation where there are two or three transformers, only two sets of transformers are required. Or three sets of the same protection system can be realized. The transformer in this example is a three-winding transformer with a transformation ratio of 110 / 35 / 10kV; both the medium and low-voltage side busbars only consider the case where there are only two outgoing lines and one tie circuit breaker. For the case where there are more than two outgoing lines, It is only necessary to configure the number of measuring elements according to the actual number of outgoing lines, and the logic of the protection is exactly the same as this example.

[0025] On the three sides of the protected transfo...

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Abstract

This invention relates to a step-down transformer and its relay protection method for its lower-middle voltage side bus bar characterizing in quickly determining positions of fault spots by logically comparing the operation states of measured elements at each side of a transformer and at each exit position of the lower-middle bus bar and removes the fault device in a small action time limit to realize the quick backup protection of transformer in a step-down substation and a master protection to the lower-middle voltage side bus bar.

Description

Technical field [0001] The invention belongs to the field of relay protection of electric power systems, and mainly relates to a step-down transformer and a relay protection method for a middle and low voltage side busbar based on the principle of longitudinal connection comparison. Background technique [0002] In the power system, the substations accounting for more than two-thirds of the total are step-down substations, and the step-down transformers and the bus bars on the medium and low voltage sides are important equipment in the step-down substations. At present, transformers use differential protection and gas protection as the main protection for internal faults, and overcurrent protections installed independently on separate sides are generally used, including general time-delayed overcurrent protection, low-voltage blocking overcurrent protection, and compound voltage blocking overcurrent protection. flow protection etc. as backup protection. The bus bar on the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/04H02H7/22
Inventor 潘贞存丛伟王瑞丁磊
Owner SHANDONG UNIV
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