Fusion detecting system for relays

Details Fusion detecting system for relays Fusion detecting system for relays

G - Physics

01

R

324/21

G01R 31/327 (2006.01) H01H 47/00 (2006.01) H01H 71/04 (2006.01) H01H 73/12 (2006.01)

Patent

CA 2039163

ABSTRACT OF THE DISCLOSURE A fusion detecting system for relays is provided for detecting a fusion of relay contacts. Two fully- interlocked or semi-interlocked relays are connected in such a manner that they operate under identical conditions, and a fused state is detected based on the states of signals sent from series-connected make contacts and series-connected break contacts of the two relays. In the case of semi-interlocked relays (R1, R2), if a make contact (r12) is fused during a current supply to a coil, the other contact (r22) remains in an open state or at a make-contact side after the current supply to the coil is cut off, and if a break contact (r11) is fused, the other contact (r21) remains in an open state or at break-contact side after a current is supplied to the relay coil. Accordingly, by using two semi-interlocked relays under identical conditions and connecting same such that the make contacts and the break contacts are individually connected in series, a fusion of the relays can be detected based on signals sent from the contacts. A fusion of fully- interlocked relays can be detected in a like manner.

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