Can any one help with a GE IFC53 relay that trips for no apparent reason.
The system is a 4160V air break circuit breaker with (3) IFC53 relays for 50/51 phase protection. The settings for the IFC53 are 400:5 CTs, Tap setting = 4(320A), Time dial = 4.0, and Instantaneous = 70(5600). This...
I am getting a transformer from China, and the nameplate shows taps of: 1, 2, 3, 4, and 5. I am familiar with US transformer nameplates that have taps like: C, D, E, F, and G and are shown with their relative positions on the windings. Comparing the nameplate voltages I know that the US nominal...
There is a discussion, going on in a different forum (so far it has gone on for a total of 15 pages) concerning the loading of a wye connected transformer.
The only important fact is the transformer in question would have a 208Y/120 connected secondary. With a single 208V 10A resistive load...
I am working on the specifications for a 4160V to 480 transformer to feed a 600HP 18 pulse AC variable frequency drive.
The drive manufacturer recommends the use of a 480Y/277 transformer with an HRG. But then the manufacturer also says it is not their problem if any common mode noise is caused...
I have a customer that is trying to install a "maintenance bypass" transformer in parallel with his existing backup generator and normal utility feed.
The new transformer is fed from the same utility connection point as his existing transformers. All of the transformers are cast coil...
We have just finished sampling R-Temp fluid filled substation style transformers. The transformers are from various manufacturers and range from 10-15 years old. Eight of the samples all moisture in them.
Does any one know if this is typical of R-Temp fluid from that time period? Any...
What is the sense in purchasing and using power system analysis software, like SKM, if utilities will not provide accurate "as currently installed" information?
Yes I understand that at some future date they may upgrade the transformer and other equipment feeding a facility, but how about...
I am evaluating the grounding for an outdoor switch yard (open air 35KV structure and metal-enclosed 5KV gear). What do I need to consider for the bonding of the chain-link (cyclone) fence. I know to bond each side of each gate (or jumper across the opening). Does every support post need to be...
