Invention Grant
- Patent Title: Method and an apparatus for supervision of current transformer in a differential protection system
- Patent Title (中): 差动保护系统中电流互感器的监控方法和装置
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Application No.: US13920653Application Date: 2013-06-18
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Publication No.: US09270107B2Publication Date: 2016-02-23
- Inventor: Ylinen Juha , Shah Nayan , Kandakatta Murali
- Applicant: ABB TECHNOLOGY LTD
- Applicant Address: CH Zürich
- Assignee: ABB TECHNOLOGY LTD
- Current Assignee: ABB TECHNOLOGY LTD
- Current Assignee Address: CH Zürich
- Agency: Buchanan Ingersoll & Rooney PC
- Main IPC: H02H3/00
- IPC: H02H3/00 ; H02H7/04 ; H02H7/045

Abstract:
A method and device are disclosed for supervising the operation of plural current transformers and for prevention of a malfunction, such as false tripping of power in an electrical system. Exemplary embodiments can include measuring current parameters (e.g., magnitude and phase angle) for each winding in current transformer (CT) sets. A negative sequence current can be calculated from measured phase currents and a fault condition determined. A phase angle difference parameter derived from phase measurements between two healthy CTs can be used as an additional condition parameter for reliable operation of equipment in the electrical system.
Public/Granted literature
- US20130279048A1 METHOD AND AN APPARATUS FOR SUPERVISION OF CURRENT TRANSFORMER IN A DIFFERENTIAL PROTECTION SYSTEM Public/Granted day:2013-10-24
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