Hello
I need help interpreting the rotary switch (CHR10 type) schematic.
I have drawn part of the vendor drawing that I need help with.
How do you read this? Say switch is on A position, does this mean contacts 1-2, 5-6 and 9-10 are closed? If B is chosen, 3-4, 7-8 and 11-12 would be closed...
We have to calculate the total relay time (tripping delay) for a 115 kV Breaker for fault analysis.
Let’s say primary lead differential relays operate a lockout relay which in turn trips another WL-1 relay for breaker trip.
The results (test conducted a decade ago) we have is as follows:
• A...
We are planning to store a 700MVA (about 900,000 lbs) transformer in a new foundation with storm drain facility. The foundation will not have any fire protrection (sprinkler system) but will have oil containment pit.
We'd like to know what requirements are there for storage of a spare...
I know MCCs are commonly used for providing power to a motor circuit, such as pump or even motor etc. They have the OL/OC protection and starter cicuitry.
Question I have is, can I use one of the bucket from a generic 480V MCC cubicle to provide power for Transformer auxilliaries which do not...
Need to get your input on going from multi ratio revenue meter to single ratio.
Only the CT discrepancies are listed:
The existing one:
200/400:5 DR with 1.5/2.0 RF
Thermal rating: 3000 VA
Proposed one:
200:5 SR at 4.0
Thermal rating: 4000 VA
The VT ratio (700/1200:1:1), accuracy...
