Invention Grant
- Patent Title: Load compensation in distance protection of a three-phase power transmission line
- Patent Title (中): 负载补偿在三相输电线路的距离保护
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Application No.: US12293601Application Date: 2006-10-18
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Publication No.: US08159229B2Publication Date: 2012-04-17
- Inventor: Magnus Akke , Björn Westman , Henrik Åshuvud
- Applicant: Magnus Akke , Björn Westman , Henrik Åshuvud
- Applicant Address: CH Zürich
- Assignee: ABB Technology Ltd.
- Current Assignee: ABB Technology Ltd.
- Current Assignee Address: CH Zürich
- Agency: Venable LLP
- Agent Eric J. Franklin
- International Application: PCT/EP2006/067552 WO 20061018
- International Announcement: WO2008/046451 WO 20080424
- Main IPC: G01R31/08
- IPC: G01R31/08 ; H02H3/00

Abstract:
A load compensation method for phase-to-ground loops in distance protection. A first reactive reach is estimated assuming zero fault resistance or with a positive sequence current. A second reactive reach is estimated with a zero sequence current. A third reactive reach is estimated with a negative sequence current. An import or export condition is estimated. A fourth reactive reach for import or export condition is estimated based on the first, second and third reactive reach. A fault impedance is estimated based on the estimated fourth reactive reach.
Public/Granted literature
- US20100225329A1 LOAD COMPENSATION IN DISTANCE PROTECTION OF A THREE-PHASE POWER TRANSMISSION LINE Public/Granted day:2010-09-09
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