Has anyone ever seen an over pressure device used on SF6 gear? Specifically, something like a high power SF6 VT (100kva per phase)?
It's being suggested for a project I'm working on but I don't have experience doing this. The functional analogy that is wanted would be like a Bucholtz relay...
I'm trying to model the damage curve of a neutral grounding reactor in CYMTCC... I'm used to having all the libraries I need already in the CYMTCC database, and I'm not sure what the correct way to properly build the custom model for the reactor. Does anyone have any experience or advice with...
I'm working on an old, crude DCB scheme.... The zone 3 elements are 67, not 21. When I think about it... I start wondering if the 67 is actually more secure than a 21. I would never think of using 67 on a new job. When using a Z3 21 you must coordinate with the remote end Z2 21. I guess if...
I'm talking about DC trip/close coils in primary switch gear typically found in a HV switchyard.
Do you folks typically fuse your DC circuits inside the relay building or at the breaker mech box? For example, we typically supply these ccts from a DC panel, the cct is fused inside the relay...
Hi folks, looking for some insight from everyone...
I'm replacing all of the DC station service equipment at a large 230/115/27.6 station. I'm pondering different outage scenarios related to different design options available to me. Let's assume that the old DC stn srvc (the one to be...
Hello All,
This question is specific to setting the GE D60 line protection relay. I'm working with firmware v5.71 if that makes a difference...
I'm using CAPE to get my fault and apparent impedance values.
I am defining ZL0/ZL1 in my settings file. Both values are obtained from CAPE. My...
Generally, I'd like everyone's opinion on using a grounded vs. ungrounded system for station service at a sub station. Typically we have always used grounded. Typical loads for new stations would be 600 : 120/208. Personally I like things that are grounded, from a safety point of view...
I am revisiting some of the grounding techniques we use on CVT circuits.
With respect to the CVT secondary cables... Generally, I would want to ground the cable shield at both ends of the cable (good for high freq. transient suppression). I also know that the bonding conductor connecting...
I know... another power quality monitoring thread. But please bear with me.
IT = Instrumentation Transformer (ie: CT, PT, VT, CVT, etc...)
So let’s assume we want to add some power quality/disturbance monitoring equipment at a HV station. This implies we are interested in getting information...
I'm testing some bushing CT's on a new 500kV SF6 ABB breaker. Recently intercore coupling has become a required test for us complete. I notice there is an IEEE on this. Our internal test procedure (which is only a brief paragraph) says that when measuring voltage on the companion CT - across...
Has anyone ever experienced a missoperation with this relay during the deenergization of a transformer in respect to the relays algorithim for calculating 2nd harmonic current?
I've heard of a trip over the weekend at one of our stations where deenergizing a transformer at a tapped station...
I work for a public utility in Canada. Been here for about two years now in a field P&C position. When I was watching the news this morning I saw that the government is thinking about selling the utililty to the private sector.
Has anyone been in this situation before? Any experiences worth...
Hello All. I work for an offshore oil and gas company, and we have a FPSO (floating production storage and offloading) currently in service. We have contracted a company to provide us with a simulation environment for the I&C onboard the ship. Basically we have an exact mock-up of our control...
Hello all. I've browsed these forums for a long time, but am now just making an account. I'm a new electrical engineer, and am always looking for new reference tools to use on the job. Any support would be appreciated.
I have been asked by my boss to draw up some spec's on HV Motor Storage...
