We are under the gun to conform with the new NERC power Factor requirements of 97%. This will involve the installation a many new cap banks.
My problem is that we use the Cannon Technologies AMR system and have blocking units in the neutral of each bank to prevent the signal from being shunted...
The Texas Public Utility Commision has recently approved a Smart Metering initiative that least two companies are trying to accommodate via BPL.
My knowledge of the technology is limited, but I understand it involves a significant number of coupling capacitors to get the high frequency signal...
My utility is trying to help the local phone company find the source of a 9th harmonic which is causing noise on their system. The area is almost exclusively rural load with two exceptions; a lot of pipelines in the area (cathodic protection) and one large pipeline pump (1200 Hp).
We've ruled...
Our utility is under pressure from the State governing board to upgrade one of our transmission lines due to "contingency congestion restraints". Because of budgetary constraints, we would like to explore the use of the new "composite core" type conductors that would allow us to increase...
We are purchasing a 12/15/20 MVA transformer that is dual/dual (138/69 kv primary, 24.9/12.47 kv secondary).
The transformer had just be completed and the factory was doing the acceptance tests when they said they had some "high" readings on the "series" winding.
All the sales rep could tell me...
In response to some information I got on this site concerning matching impedances in transformer banks, (thanks to all who participated) we've implemented a +/-10% impedance standard.
Now my problem is that we have an existing bank (3 wire, 3 phase, 480 volt delta with corner ground) that has...
My boss just informed me that I am expected to dine next week with one of the members of our Board of Directors.
In 24 years I've never even observed a Board meeting.
So I ask around and find out the Board member has a buddy who is selling synchronous condensers and is trying to convince the...
Our Coop is bidding out some 1000 Kva 7.2/14.4 autotransformers (the usual "needed it yesterday" type of bid). We got a very attractive bid from Areva (formerly Alstrom) Transformers. The two things that concern us are that we have no experience with this company, nor with the aluminum windings...
There is an on-going debate at our Coop about matching the impedances of single phase transformers in wye/delta (open and closed types) and wye/wye banks. Please keep in mind I am asking this in regards to banking transformers, not paralleling them.
An old REA document (Bulletin 161-22, page...
We are a utility serving a plant that has a dual feed. We are wanting to take one of our transformers out for repair and shift the load to the other. The second bank is sufficient to handle the load, but the plant says that the buss work is not rated to handle the load (ie- a 2000 amp buss that...
I posted this in thermodynamics section by mistake, so my apologies.
The electric Coop I work for spends a lot of time and effort promoting high efficiency AC units (SEER 14 or better).
On the other hand, my brother-in-law sells AC units for a living and has the opinion that, once you get above...
I may not have the right forum here, so apologies in advance. Also for length!
The electric Coop I work for spends a lot of time and effort promoting high efficiency AC units (SEER 14 or better).
On the other hand, my brother-in-law sells AC units for a living and has the opinion that, once you...
I originally posted this question in the "motor and motor controls" forum.
"Let me see if I can explain the original concern. Suppose a recloser is looking down a distribution line. A smaller, moderately loaded line breaks off of it that is protected by this sectionalizer.
A permanent fault...
This sounds like a "power" subject, but bear with me here.
Since all our inrush is airconditioning load, I figured this site would be better than the power one.
At our electric utility, we are looking at some new line sectionalizers that utilize electronic circuitry to differentiate between...
We (a utility) serve a plant that utilizes a switched neutral resistor in a 4w, 3 phase 277/480 volt wye. From reading the instruction book, apparently its' purpose is to switch a resistor into the netral of the circuit if it senses a phase fault. It also has the capability to switch a portion...
Our Utility has been a long time advocate of Cooper reclosers, particularly their VWVE's and Nova products.
Without going into details that would make this look like a rant, we have recently made the decision to go with SEL 351-R's; conversely, Cooper has made the decision not to sell their...
Our Utility recently had a 12.5kv to 240/120 volt (connected delta primary with an ungrounded common, 4w delta secondary) transformer bank blow a fuse on one of the "high leg" transformers. When re-fused, it blew again.
Standard procedure at the Utility calls for isolating the tranformer from...
