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Simple bus protection method based on system topology

A busbar protection and busbar technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of complex implementation, low feasibility, and no selectivity

Active Publication Date: 2017-01-11
NR ELECTRIC CO LTD +1
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Problems solved by technology

[0011] The present invention provides a new method of simple busbar protection in order to solve the existing low-voltage simple busbar protection problems of low feasibility, complicated realization and no selectivity

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  • Simple bus protection method based on system topology
  • Simple bus protection method based on system topology
  • Simple bus protection method based on system topology

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Embodiment Construction

[0041] The low-voltage busbar is usually composed of multi-section busbars, and the incoming line of the low-voltage busbar is the low-voltage side of the transformer, such as figure 1 1DL to 4DL in the series; the outlet interval can be divided into two types: one provides fault current to the low-voltage busbar, commonly known as a small power supply interval, such as a capacitor bank, such as figure 1 1L1 ~ 4L1 in the middle, the other is the load interval, such as figure 1 1LN ~ 4LN in ; the section interval connecting each section of busbar, such as figure 1 FD1 ~ FD3 in.

[0042] Define the load module, input the blocking signal sent by the load outlet protection in the system, and output the summarized load blocking signal:

[0043] L o a d _ b s = Σ i = 0 N L o a d _ bs i ...

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Abstract

The invention discloses a simple bus protection method based on a system topology. According to a primary system topology structure, bus unit modules are configured according to buses, each bus unit module judges the fault mode of the bus section according to incoming line and section over current conditions, and a fault processing module realizes small power, incoming line and section tripping processing according to a received outgoing line protection blocking signals and the fault mode of each bus unit module. Failure protection on the incoming line and a section switch can also be considered. By adopting the simple bus protection method of the invention, the problems of complex realization and poor selectivity existing in the existing simple bus protection can be solved, and no misoperation in the case of outgoing line fault can be ensured; and in the case of fault in the bus area, an over current incoming line or an over current section is cut off selectively according to a low bus and section over current condition, the selectivity and the quickness of simple bus protection are improved, and the practical value is high.

Description

technical field [0001] The invention relates to the protection of electric power system busbars, in particular to the protection technology of low-voltage busbars. Background technique [0002] current technology [0003] The busbar is an important component of the power system. For the high-voltage busbar with a voltage level of 110kV and above, the use of current differential protection is the solution to the busbar fault. Smaller, generally no bus protection device is installed, mainly relying on transformer backup protection to remove low-voltage bus faults, the fault removal time is long and the selectivity is poor. [0004] The low-voltage bus is usually composed of multi-section buses, and each section of the bus is connected by a segment switch. The outgoing lines on the bus include loads, capacitors, inductors, station transformers, etc., and the number is large, and the low-voltage bus is relatively high-voltage. More frequently, the above reasons all lead to a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22
CPCH02H7/22
Inventor 李力丁杰吕航张晓宇金震鲍凯鹏
Owner NR ELECTRIC CO LTD
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