Invention Grant
- Patent Title: Negative sequence directional element for a relay useful in protecting power transmission lines
- Patent Title (中): 用于保护输电线路的继电器的负序定向元件
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Application No.: US961260Application Date: 1992-10-15
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Publication No.: US5349490APublication Date: 1994-09-20
- Inventor: Jeffrey B. Roberts , Edmund O. Schweitzer, III
- Applicant: Jeffrey B. Roberts , Edmund O. Schweitzer, III
- Applicant Address: WA Pullman
- Assignee: Schweitzer Engineering Laboratories, Inc.
- Current Assignee: Schweitzer Engineering Laboratories, Inc.
- Current Assignee Address: WA Pullman
- Main IPC: H02H3/08
- IPC: H02H3/08 ; H02H3/40 ; H02H7/26 ; H02H3/26
Abstract:
A directional element measures the negative sequence voltage and the negative sequence current and from those quantities produces a scalar quantity related to the negative sequence impedance of a power transmission line relative to the location of the directional element. The scalar quantity is then compared against two threshold quantity settings, one to determine a forward fault, the other to determine a reverse fault. The scalar quantity must be less than the forward threshold quantity for a forward fault and greater than the reverse threshold quantity for a reverse fault.
Public/Granted literature
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