Machine room
Motor
Lift car
Counter Weight
Over-speed governor
Traveling cable
Brake
Loading entrance
Lift well
Lift pit
Wednesday, November 18, 2009
Saturday, May 16, 2009
Oil Circuit Breaker
The arrangement permits two advantages firstly the current breaking chamber requires a small volume of oil which is just enough for arc excitation secondly, the amount of oil to be replaced as the in the supporting chamber does not get contaminated the arc.
The single phase oil circuit breaker, there are only one moving contact. But HTM branch dehiwala has three phase oil circuit breaker. There are six moving contacts. Their supporting chamber and circuit breaking chamber made having metal. But single phase OCB supporting chamber made porcelain. Three phase OCBis very heavily we can’t moving it very easily.
The single phase oil circuit breaker, there are only one moving contact. But HTM branch dehiwala has three phase oil circuit breaker. There are six moving contacts. Their supporting chamber and circuit breaking chamber made having metal. But single phase OCB supporting chamber made porcelain. Three phase OCBis very heavily we can’t moving it very easily.
Earth Fault Protection
• Earth fault current may be limited.
• Sensitivity and speed requirement may not be met by over current relays.
• Use separate earth fault relay
• Connect to measure residual (zero sequence) current.
• There fore can be set to values less than full load current.
• Sensitivity and speed requirement may not be met by over current relays.
• Use separate earth fault relay
• Connect to measure residual (zero sequence) current.
• There fore can be set to values less than full load current.
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