Hi all,
I will be installing a Zig-Zag transformer to provide a ground reference for a 69kV delta system. This Zig-Zag TR will be installed in conjuction with a two-winding power transformer where the phasing into the power transformer is Phase 1 into the H1 bushing, Phase 2 into the H2...
We have a number of drawings that were intended as 2D plan and elevation drawings. Somehow, some 3D attributes were mixed into the drawings, which is creating some problems. With people cutting and pasting objects to and from drawings, this seems to be spreading. Is there any easy way to...
We have a client that is interested in taking a negative sequence voltage measurement back to their DFR. From looking at their schemes, they don't appear to have any relay or device capable of producing a negative sequence voltage output for use by the DFR.
1. Does anyone know of an old...
I am looking for documentation on a TRW 9550 RTU. Does anyone know of where I can get ahold of information on this device? From what I have gathered, it appears that the company has gone belly up awhile back which is probably why finding anything on this may require a little bit of digging...
Does anyone know of a good way to locate conduits around a substation?
The instrument we have is one that ties to the neutral of the circuit you are tracing and sends out a radio signal. The problem with this method is that the neutral is tied to the ground grid at the substation and I...
Hi,
I work for a small city owned utility and they are trying to rectify a problem where they don't have enough fiber between their sites for all the applications they would like to use. I, unfortunately, have been removed from this for awhile and would appreciate anyone's comments who has a...
Does anyone know of any resources available on the quad curve? We are commissioning some transmission relays...more specifically, the distance element of the relays. The fellow we had out here to test the settings had an Omicron test set that broke during testing so we are looking for...
I posted this question in the motor forum, but may be more appropriate here...
I was asked a question about which transformer design is best for a plant using large induction motors (no plug stop)...the largest is two 1250HP motors. The question was whether a circular-design power transformer...
I was asked a question about which transformer design is best for a plant using large induction motors (no plug stop)...the largest is two 1250HP motors. The question was whether a circular-design power transformer or traditional rectangular design power transformer is best suited for this...
One of our clients had a Trip Coil burn up on one of their GE 69kV Circuit Breakers. They found it after a fault had occured on the breaker's line, causing the breaker failure relay to trip the sub offline.
The odd thing is that the prints for these breakers show them having two trip coils, so...
We are in the beginning stages of designing a 138 to 69kV substation on a greenfield site and would appreciate any input as to the design/layout. The substation is to be designed for an ultimate build-out of three 28MVA transformers, but will probably only see two of them ever installed. The...
We had an interesting situation come up here recently...wondering if anyone had seen anything like this:
The city was seeing intermittent trips on a 15kV breaker which was tied to an underground feeder. Within a week, one of the phases (they run each phase in a separate conduit), faulted. They...
