Search results for query: *

What is the approved way to function test an incomplete tap change operation on a 138KV Smit transformer?

What is the perferred way to function test a (52Y} anti-pump relay on a 138KV Siemans SF6 breaker prior to putting this breaker in service?Siemans anti-pump relay function test

In a substation with transformers, feeder rows and a control room, how would you explain the difference between load relief, load shedding and load stripping?

After much on the job discussion, what is the primary reason to have just a single point ground on a CT circuit?

In a substation with a 230KV / 13.8 KV transformer feeding five feeder rows. What would the typical sequence when load relief 1 and 2 is initiated. Also what is the purpose of the 200 ohm resistor in series with the 487 leading to the coil of the 94 relay?

For a 230/13.8 transformer in a substation feeding five feeder rows,what is the general operation sequence after a differential transformer operation? The control house contains SEL 487E relays and SEL 451 relays in the feeder rows.