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Automatic protection system of unattended substation

A substation automatic and protection system technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as damage and long-term short-circuit faults in feeder cabinets

Inactive Publication Date: 2014-12-10
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

This makes short-circuit faults in feeder cabinets exist for a long time, often causing serious damage

Method used

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  • Automatic protection system of unattended substation
  • Automatic protection system of unattended substation

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with accompanying drawing:

[0012] Such as figure 1 figure 2 As shown, in order to ensure the safe operation of the substation, usually the substation can be equipped with two sets of high-voltage lines, and a main transformer and a backup transformer are set in the substation. The substation with double transformers is taken as an example below to describe the unattended substation automatic protection system provided by the embodiment of the present application. The substation in the figure includes: main transformer CT1, standby transformer CT2, busbar M, bus coupler cabinet and multiple feeder cabinets, wherein, busbar M is connected with main transformer CT1 and backup transformer CT2 respectively, multiple feeder cabinets (each feeder cabinet Including one of the switches Q6, Q7, Q8 or Q9) are respectively connected to the busbar M for outputting low-voltage electricity to the user, and the b...

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Abstract

The invention discloses an automatic protection system of an unattended substation. The substation comprises a main transformer, a spare transformer, a bus, a bus couple cabinet and a plurality of feeder cabinets. The system comprises a first current transformer, a high-side switch, a low-side switch, switch arc light probes, a first arc light relay expander, a second arc light relay expander, a bus couple current transformer and a main control unit. According to the automatic protection system of the unattended substation, the arc light probes are respectively arranged in switch rooms of the feeder cabinet and the bus couple cabinet, a bus room and a cable room, and the power-off protection can be performed on the substation according to detected arc light signals and current when any of three independent space in the feeder cabinet or the bus couple cabinet fails.

Description

technical field [0001] The invention relates to an automatic protection system for an unattended substation. Background technique [0002] In the case of medium and low voltage bus faults, especially in the case of feeder cabinet power distribution devices, the arc may ignite the components in the feeder cabinet, causing a fire, causing a large area of ​​power distribution equipment to burn, and even destroying the DC system, resulting in more serious consequences. If fast protection is installed, the protection will act immediately after the fault occurs, and the fault will be cleared before the arc burns, and the power supply can be restored quickly, and the loss is greatly reduced. According to the rapidity of relay protection, in order to ensure the safe operation of transformers and bus tie switchgear, it is urgent to configure medium and low voltage busbar protection. [0003] In the power system, according to the current protection regulations, 110kV substations are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22
Inventor 赵丽周晋豫杜娟
Owner STATE GRID CORP OF CHINA
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