DIGITAL PROTECTING RELAY DEVICE FOR D.C. POWER FEED LINE

Japanese Patent JPS6390450

A

PURPOSE:To make it possible to surely discriminate trouble current during start of an electric car, by detecting the presence of a trouble in such a logic AND that whether or not the degree of load current through a d.c. power feed line, which is subjected to A/D conversion, exceeds a predetermined value or not, and whether or not an increasing variation in the current is continued for a predetermined time. CONSTITUTION:A digital relay section 16 is composed of a d.c. power feed line load current input section 11, an A/D converting section 12, a CPU section 13 and a memory section 14, and digitally processes d.c. power feed line load current so that the presence of a trouble is discriminated in accordance with such a logic AND condition that whether or not the degree of load current exceeds a predetermined value, and whether or not a variation in the load current exceeding a predetermined value is continued for a predetermined time. With this arrangement, it is possible to surely discriminate whether it is a load current or a trouble current during start of an electric car, and therefore it is possible to eliminate unnecessary operation, thereby it is possible to make highly sensible and accurate detection and protection.

JPH06121409	ORBITAL CONVEYING SYSTEM
JPS5952607	[Title of the Invention] An electric supply device of a running body
WO/1995/022470	EXTINGUISHABLE SWITCHING LEG

OISHI TETSUHISA

JP23485486A

April 21, 1988

October 01, 1986

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MITSUBISHI ELECTRIC CORP

B60M3/00; H02H3/44; (IPC1-7): B60M3/00; H02H3/44

JPS5826640A	1983-02-17
JPS5644663A	1981-04-23

Mamoru Takada (1 person outside)

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