Line longitudinal differential protection method for transformer station area information collection

A longitudinal differential protection, substation technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problems of reducing the reliability and safety of substations, limited area of ​​substations, and inability to configure fast protection for incoming lines, etc. Achieving good application prospects, improving reliability and safety

Active Publication Date: 2015-12-23
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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Problems solved by technology

[0003] The technical problem solved by the present invention is that the occupied area of ​​the existing substation is limited, and it is often impossible to install the incoming line CT at the incoming line, so that the incoming line cannot be equipped with selective fast protection, which reduces the reliability and safety of the substation sexual problems

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  • Line longitudinal differential protection method for transformer station area information collection
  • Line longitudinal differential protection method for transformer station area information collection

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] The line longitudinal differential protection device for collecting substation domain information of the present invention can realize selective and full-range quick-moving longitudinal differential protection without installing CT on the substation line, and improve the safety of the substation. reliability and security, such as figure 1 shown, including the following steps,

[0024] Step (1) The station area information collection device on this side collects the current of all intervals on the bus where the line is located; figure 2 As shown, this side is the M side, and the opposite side is the N side. If there is no CT on the bus side of the transformer bay, the other side of the transformer is used as the bay input;

[0025] Collect the current of all intervals on the bus where the transformer line is located. The collection methods include conventional...

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Abstract

The invention discloses a line longitudinal differential protection method for transformer station area collection. The method includes the steps of: 1) collecting current of all intervals on a bus where a line is; 2) obtaining the voltage grade, CT transformation ratio and angle turning mode of each interval, and reducing current of each interval to a corresponding interval where the line is; 3) forming incomplete differential current of a local side by summing the current of each interval after reduction; 4) through a braking current calculation method, forming incomplete braking current of the local side; and 5) by performing data synchronization and transmission on a line fiber channel and a line protection device of an opposite side, realizing line longitudinal differential protection. The line longitudinal differential protection method for transformer station area collection can realizes longitudinal differential protection having selectivity and full-range quickness under the condition that a transformer station line is not equipped with a CT, improve reliability and safety of a transformer station, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a line longitudinal differential protection method for substation domain information collection. Background technique [0002] With the rapid growth of electricity load and the large-scale access of distributed energy, the construction of power grid has been developed rapidly. However, due to various factors such as shortage of land resources, difficulties in land acquisition and demolition, and public misunderstandings about electromagnetic radiation of power transmission and transformation equipment, etc. Influenced by the current substation, the floor area of ​​the current substation is getting smaller and smaller, especially for the traction substation of the high-speed rail system, the terminal substation of industrial and mining enterprises and other special substations. Line CT, the incoming line cannot be configured with longitudinal differe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 陈实刘颖
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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