Arrangement for detecting a deficient operational capability of

Details Arrangement for detecting a deficient operational capability of Arrangement for detecting a deficient operational capability of

1975-04-02

1977-07-05

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

200144B, 337412, 337265, 340242, 361120, H02H 722

Patent

active

040342646

ABSTRACT:
The invention is directed to an arrangement for detecting deficient operational capability in a vacuum switching vessel. The arrangement can provide a signal if a fault occurs which affects the operability of the switching vessel. Instead of a signal, a protective device alone or together with the signal can also be caused to respond. The arrangement includes a body of a material which changes its physical characteristics substantially in a limited temperature interval and is attached in heat-conducting contact with a part of the vacuum switching vessel which has a temperature time constant as small as possible. This change of the characteristics of the body acts to initiate the above-mentioned signal or action of the protective device. The invention is suited particularly for application in switchgear with vacuum switching vessels.

REFERENCES:
patent: 1666339 (1928-04-01), Miller
patent: 2318607 (1943-05-01), Grant, Jr.
patent: 2478117 (1949-08-01), Mesh
patent: 2659789 (1953-11-01), Lang
patent: 2983806 (1961-05-01), Fawkes
patent: 3214544 (1965-10-01), Leeds
patent: 3403297 (1968-09-01), Crouch
patent: 3404247 (1968-10-01), Glassanos
patent: 3469217 (1969-09-01), Linton
patent: 3493952 (1970-02-01), Jette
patent: 3626125 (1971-12-01), Tonegawa
patent: 3742417 (1973-06-01), Snipeliski
patent: 3814885 (1974-06-01), Sofianek
patent: 3864960 (1975-02-01), Fletcher et al.

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