Title:
【発明の名称】引きはずし装置の手動作動を検出する方法
Document Type and Number:
Japanese Patent JP2002534053
Kind Code:
A
Abstract:
A method of detecting manual trips and reclose operations in an intelligent electronic device, e.g., electronic trip unit or protective relay, is presented. The intelligent electronic device includes a microcontroller and associated memories. An algorithm (program) stored in a memory of the intelligent electronic device detects manual trips when the following conditions are satisfied: (1) no trip event message has been issued by the trip unit within the reaction time required to trip the circuit breaker; (2) current becomes zero on all phases of the line; and (3) voltage downstream from the circuit breaker becomes zero on all phases. Reclose operations are detected when load side voltages on all phases return from 0V to nominal levels of the line side of the breaker.
Inventors:
Andersen, Bo El
Application Number:
JP2000591638A
Publication Date:
October 08, 2002
Filing Date:
December 28, 1999
Export Citation:
Assignee:
GENERAL ELECTRIC COMPANY
International Classes:
H02H3/05; H01H1/00; H01H47/00; H01H71/04; H01H9/16; (IPC1-7): H02H3/05; H01H47/00
Domestic Patent References:
| JPS62210825A | 1987-09-16 | |||
| JPS54159669A | 1979-12-17 | |||
| JPH03127416A | 1991-05-30 |
Attorney, Agent or Firm:
Kenichi Matsumoto