In some cases we need two independent trip contacts and to duplicate of contact is not allowed. Is it normal and usual practice for manufacturers to build a relay with such specification?
2006-10-29 21:34:25 · 1 answers · asked by nader 1 in Science & Mathematics ➔ Engineering
A Buchholz Relay has two different detection modes. On a slow accumulation of gas which then accumulates in the top of the relay and forces the oil level down. A float operated switch in the relay is used to initiate an alarm signal. This same switch will also operate on low oil level, such as a slow oil leak. If an arc forms, gas accumulation is rapid, and oil flows rapidly into the conservator. This flow of oil operates a switch attached to a vane located in the path of the moving oil. This switch normally will operate a circuit breaker to shut down (isolate) the apparatus before the fault causes additional damage.
Because these are 2 very different modes, they have to work independently.
2006-10-30 01:25:52 · answer #1 · answered by Marianna 6 · 0⤊ 0⤋