Oil Circuit Breaker Repairs / OCB Drain Valve Leaks
Common in many substations are oil filled circuit breakers. Typical
of this type is the Westinghouse 345 kV unit shown in Figure 1.
 |
Figure 1
|
There are usually two common leaks on OCB's that TDS has repaired
in the past. The most common leak is a drain valve leak, See Figure
2. Drain valves are repaired exactly the same way as on transformers.
Usually OCB drain valves leak at the valve hex end to the threaded
pipe nipple. This leak is always repaired with a clamp. Drain valve
stems can be repaired using the drill and inject method.
 |
Figure 2
|
|
