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Protection zone selection system in relay based on microprocessor of electric power system

A technology of protection area and power system, applied in the field of protection area selection system

Inactive Publication Date: 2006-02-08
SCHWEITZER ENGINEERING LABORATORIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, designing and implementing replica devices is considered a major drawback

Method used

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  • Protection zone selection system in relay based on microprocessor of electric power system
  • Protection zone selection system in relay based on microprocessor of electric power system
  • Protection zone selection system in relay based on microprocessor of electric power system

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Embodiment Construction

[0025] The bus arrangement at a power system station will typically consist of one or more separate busses, as well as circuit breakers, transformers (CTs), disconnect switches and incoming and outgoing power lines. Each of these components is typically included in so-called "circuit branches," which extend among selected circuit elements, such as buses and other convergence points. An example circuit breaker includes a breaker branch, a CT branch, a breaker-CT branch and a disconnect branch. A circuit breaker branch is a connection that contains a circuit breaker capable of interrupting load and fault current. A CT branch is a branch comprising a transformer. The protected relays get digital inputs and current signals from the CTs. A breaker-CT branch is a connection that represents a combination of a circuit breaker and a transformer (CT). A disconnect branch may be a connection to a disconnect switch or a circuit breaker branch instead of a CT, or other element that allo...

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Abstract

The system uses graph theory to define busline arrangements as a series of vertices and edges, wherein the vertices include the number of busses in the system and the edges include disconnect circuit branches connecting the individual vertices. A particular system configuration, selected by the system operator, determines the status (open or closed) of the various disconnect branches. A processor establishes an incident graph matrix, including positions of all the vertices and edges. The matrix is modified in accordance with graph theory and the condition of the disconnect switches. Graph operations are performed to produce a resulting matrix which defines vertices and the edges incident thereon into zones of protection. Fault analysis in the busline can then be performed in accordance with each zone of protection.

Description

technical field [0001] The present invention relates generally to protection zone selection for microprocessor based bus protection relays, and more particularly to a protection zone selection system using graph / matrix theory. Background technique [0002] In a power system network, a bus line (also known as a busbar) provides connectivity for various circuits, including electrical generation, transmission, and load circuits. If a fault occurs on a particular bus, the circuits and circuitry supplying the fault current to the bus line must trip their associated circuit breakers in order to isolate the fault from other circuits connected to the bus. A bus fault can result in significant loss of traffic, and therefore, bus arrangements are typically designed such that the minimum number of circuits must be opened in the event of a fault on the bus. [0003] For various reasons, including improvements in energy availability and improved flexibility in the operation of bus syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B11/01H01H73/00H02H1/00H02H3/00H02H7/26
CPCH02H7/26H02H1/0092Y10T307/944G05B9/02
Inventor B-L·秦A·古兹曼-卡西利亚斯
Owner SCHWEITZER ENGINEERING LABORATORIES
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