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Title:
A PROTECTION RELAY FOR SENSITIVE EARTH FAULT PRTECTION
Document Type and Number:
WIPO Patent Application WO/2012/056287
Kind Code:
A3
Abstract:
The invention relates to design of protection feature in a self powered protection relay. It specifically provides a relay with sensitive earth fault protection. This protection is being achieved in tandem with optimal power on trip time (switching to fault) and with integrated logic for inrush discrimination. The self supplied protection relay is provided with a current processing module adapted to measure and evaluate line current to generate trip signal. The current processing module has the capability of inrush current suppression to block earth fault detection during an inrush condition and thereby increase sensitivity of fault detection.

Inventors:
SUTHAR, Niraj (45 Madhur Milan Society, Nr. Hari Om Nagar Ellora Park,Vadodara 7, Gujarat, 390 00, IN)
SHAH, Vishal H. (B36-Saket Bungalows, Opposite Gangotri Flats Gotri,Vadodara 1, Gujarat, 39002, IN)
DESAI, Priyank (71/B Santosh Park, SubhasshnagarBhavnagar 1, Gujarat, 36400, IN)
SHAFI, Mohammed, Y. (1-119, Gandhinagar Ghatkesar,Andhra Pradesh 1, Rangareddy District, 501 30, IN)
Application Number:
IB2011/002524
Publication Date:
August 02, 2012
Filing Date:
October 21, 2011
Export Citation:
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Assignee:
ABB TECHNOLOGY LTD (Affolternstrsse 44, Zurich, CH-8050, CH)
SUTHAR, Niraj (45 Madhur Milan Society, Nr. Hari Om Nagar Ellora Park,Vadodara 7, Gujarat, 390 00, IN)
SHAH, Vishal H. (B36-Saket Bungalows, Opposite Gangotri Flats Gotri,Vadodara 1, Gujarat, 39002, IN)
DESAI, Priyank (71/B Santosh Park, SubhasshnagarBhavnagar 1, Gujarat, 36400, IN)
SHAFI, Mohammed, Y. (1-119, Gandhinagar Ghatkesar,Andhra Pradesh 1, Rangareddy District, 501 30, IN)
International Classes:
H02H1/04; H01H71/12; H01H83/00; H02H3/10
Domestic Patent References:
WO2009101463A12009-08-20
WO1981002496A11981-09-03
Foreign References:
US4068283A1978-01-10
DE3114213A11982-02-04
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