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Digital incompletion bus differential protection method based on current state quantity

A busbar differential protection, current state technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems affecting the selectivity or sensitivity of protection action

Active Publication Date: 2015-11-11
四川艾德瑞电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the operation mode is changed, it will affect the selectivity or sensitivity of the protection action
[0006] 2. Class D current transformers with the same characteristics need to be installed in the power supply branch

Method used

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  • Digital incompletion bus differential protection method based on current state quantity
  • Digital incompletion bus differential protection method based on current state quantity

Examples

Experimental program
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Effect test

specific Embodiment 1

[0060] Step 1. Determine whether the system is a double-side power supply system or a single-side power supply system. When the system is a double-side power supply system (G11, G12 incoming and outgoing lines are , G12 incoming and outgoing lines only one of them is the power point).

[0061] Step 2. According to whether the system is a double-side power supply system or a single-side power supply system, the incoming and outgoing line intervals and bus coupler interval devices are used to calculate the current state quantities.

[0062] In step 3, the feeder interval calculates the current state quantity according to the single-side power system mode.

[0063] Step 4, sending the current state quantity at each interval.

[0064] Step 5, incoming and outgoing lines, and bus coupler bays respectively receive the current state quantities of other bays on the same bus.

[0065] Step 6: Incoming and outgoing lines and bus coupler intervals are respectively judged according to t...

specific Embodiment 2

[0086] The protection G11, G12 and current direction of the power point of the incoming line are all in the opposite direction, the protection Gk14 of the feeder line is activated in the current state, and the protections of other feeder lines and bus couplers are not activated.

[0087] G11=-1, G12=-1, Gm=1, GK11-GK13=0, GK14=1.

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Abstract

The invention relates to a digital incompletion bus differential protection method based on current state quantity. The digital incompletion bus differential protection method includes a first step of determining a system as a bi-side power supply system or a single-side power supply system and determining the current states and directions of each power supply branch; a step two of determining the current state of each non-power supply branch, wherein each device sends current state quantity based on GOOSE service and each power supply branch subscribes for the GOOSE current state quantity sent by other devices on a bus based on the GOOSE service; and a step three of each power supply branch simultaneously determining phase-splitting faults according to the whether the system is a bi-side power supply system or a single-side power supply system. The motion criteria can correctly distinguish normal operation, inner region faults and outer region fault. The current state quantity of each branch is employed for motion criteria, protection for each power supply branch is completed separately, and consistency on mutual inductor characteristics is not required.

Description

technical field [0001] The invention relates to a method in the technical field of electric power system relay protection, in particular to a digital incomplete bus differential protection method based on current state quantities. Background technique [0002] In the power system, there are generally many components connected to the busbar with a voltage level of 35kV and below. In this case, the differential current circuit using the complete current differential protection is more complicated, the cost is high, and the reliability is not high. In order to simplify the busbar Protection, reduce equipment investment, incomplete bus differential protection device has been widely used. [0003] The sum of the currents connected to the power supply branches of the bus in the incomplete differential protection of the bus (power input and output tie lines, bus coupler) is used as the operating current, and the current not connected to the non-power supply branch (feed-out line) d...

Claims

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Application Information

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IPC IPC(8): H02H7/22
Inventor 柴静波陈桁刘海波周才发李春久林宗良周建汪秋宾张开波
Owner 四川艾德瑞电气有限公司
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