Error Correction Method for Operation Mode of Busbar Protection Branch in Double Busbar Wiring

An operating mode and busbar protection technology, applied in the electrical field, can solve problems such as poor error effect, low judgment accuracy, and failure of differential current balance method, and achieve the effect of improving judgment accuracy, avoiding failure and reducing burden

Active Publication Date: 2011-12-28
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

However, the differential current balance method has many shortcomings. Due to the influence of unbalanced current, the judgment accuracy is not high, and the error effect is not good for light load conditions. In the fault state, the differential current balance method is invalid, especially in CT. When heavily saturated

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  • Error Correction Method for Operation Mode of Busbar Protection Branch in Double Busbar Wiring
  • Error Correction Method for Operation Mode of Busbar Protection Branch in Double Busbar Wiring
  • Error Correction Method for Operation Mode of Busbar Protection Branch in Double Busbar Wiring

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings. figure 1 It is a schematic diagram of a typical operation mode of double buses. In conjunction with this connection mode, the present invention is described as follows:

[0011] The branch goes from no current to current, and the branch has no operation mode judgment:

[0012] Taking WL4 as an example, assuming that the branch WL4 actually runs on the II bus, WL4 has no load or the load current is very small at the beginning, and the auxiliary contact of the knife switch connected to the I I bus is not in good contact. At the beginning, it will definitely be misjudged. If it can be identified, it is no problem to achieve the identification accuracy of 1% of the rated current in the device of the high-precision AD sampling system.

[0013] A. Recognition after WL4 has current (in the case of no fault, vector calculation is used, and the recognition accuracy is high):

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Abstract

The invention discloses a method for correcting errors in the operation mode of busbar protection branches in double busbar wiring, which is characterized in that it comprises the following steps: 1) introducing the isolation knife auxiliary contacts of all connection units running on the busbar into a protection device, In the non-fault state, the vector value is used for calculation. When the CT of the branch circuit collects current and there is no auxiliary contact of the isolated knife switch, the operating mode of the branch circuit is judged by the change trend of the differential current; 2) the The auxiliary contact of isolated knife switch of all connection units running on the bus is introduced into the protection device. In the state of fault, the sampling value is used for calculation. When there is current collected by the CT of the branch circuit, but there is no auxiliary contact of isolated knife switch. , using the differential motion condition after the anti-saturation criterion to make a judgment. The method of the invention can more effectively reduce the burden of operating personnel and improve the correct rate of busbar protection action.

Description

technical field [0001] The invention relates to a method for correcting errors in the operation mode of branches in double-bus connection, and belongs to the field of electrical technology. Background technique [0002] Among the various main wiring modes, the operation mode of double busbar wiring is the most complicated. With the change of the operation mode, various connection elements on the bus need to be frequently switched on the two buses during operation. Therefore, it is hoped that the busbar protection can automatically adapt to the change of the system operation mode, avoiding manual intervention and human misoperation caused by it. [0003] The traditional busbar protection generally uses the auxiliary contact of the isolation knife switch to judge the busbar operation mode. In the integrated circuit type busbar protection, the method of introducing the auxiliary contact of the isolation knife switch to judge the busbar operation mode is usually adopted. In o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22
Inventor 汪思满
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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