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Looking for some suggestions on possible causes of radio interference on a 230kV line, which would be in the frequency range of 70 to 250 MHz.

Hello All, One of our high voltage combined instrument transformers has failed and has to be replaced. I am trying to figure out a way where the secondaries of the remaining two CIT's could be used to create voltage and current for the missing unit for a balanced 3 phase power system. Will...

All, I have been asked to look into the probability of Main Power Transformer (230/35kV) failure should one be implemented without high side arresters. The thought process behind this is to figure out the affect of energizing a transformer without an arrester due to lead times of the...

What type of cables does this section applies to? Does it apply to instrumentation cables, which are covered under 727? What's the purpose of this limitation? Any suggestions will be greatly appreciated.

Does anyone know of any chart, code or standard that describes minimum metal to metal spearation for different high voltages during switching to avoid and arc? I have read some references where it talks about accounting for 1 ft per 110kV, but am not sure where that number came from.

I am trying to figure out a way to get KYZ pulses from a revenue meter into a SEL3530. I am therefore looking for a middleman relay that would take KYZ output from the revenue meter and then convert that info. to a serial modbus or DNP communication to take over to a SEL3530. Any suggestions...

Does anyone know if there's any US standard or code that dictates what the oneline symbol for Capacitive Voltage Transformer (CVT) should be? I have always seen one with a drain coil in it and know that drain coil should be for CCVT and not CVT.

Do any one of you has a copy of Ralph Lee's paper on application of rolling sphere lightning protection method they wouldn't mind to share? Please don't bother with a generic reply such as go find it in IEEE archives etc. unless you know specifically where. Thanks again.

Good morning All, I have an application requiring three of my air conditioner loads to start in step in order to avoid having to buy a bigger size emergency generator. my three airconditioner loads are as follows: -240V 60A single Phase AC -240V 60A single Phase AC -240V 30A single Phase AC...

I have following information on 120/240V loads MOTOR STARTING + CONTINUOUS LOADS Single phase – 120 kVA Three phase – 51 kVA MOTOR RUNNING + CONTINUOUS LOADS Single phase – 104 kVA Three phase – 12 kVA AFTER 10 SEC (CONTINUOUS LOADS ONLY) KVA Single phase – 97 kVA Three phase – 6 kVA I would...

Does anyone here know the fault withstand rating of EHS steel conductors? Even if you can provide me with Kf and Fusing Temperature values to use from IEEE 80 - Table 2 it would be a tremendous help. Thanks

Does anyone here know where I could find specs/document describing how this Westinghouse live tank breaker operates? I need to know at what point does the compressor motor starts and when does it stop. Thanks in advance.

I have a situation where I need to feed two 30A branch circuits off of a 120/240V single phase transformer. The panel board is to be located outside. Does anyone know of a small panel board / breaker box that can be used to serve just two branch circuits?

I have a fuse and conductor sizing problem I need help with: Problem: MOTOR Quantity: 32 motors motor size: 1/3 hp FLA : 3.6 A @230V LRC : 14 A connected phase to phase SERVICE 240V THREE PHASE SERVICE. I am trying to determine what size conductor and fuses to use for circuit protection...

Does any of you have any information, advise or detail showing how to ground a sliding gate in a station? Thanks

Does anyone know of any problems connecting a copper terminal to a stainless steel 4 hole pad?

Does anyone know where I could find electrical resistivity information on 610 crushed limestone?

How do you determine control cable length and size for a cable that runs from a DC source (125V) to some relay inputs like SEL or GE Multilin?

I tried this question under another subject line and received very few responses so here we go again. We have a situation where personnel are experiencing tingling sensation while touching equipment grounded to the 345kV switchyard grid. The voltage potential that exists is about 60V from the...

I am trying to find any research papers or articles on the topic of minimum phase-phase, phase to ground and particularly clearance above grade. I know that for 138kV you need 13ft clearance above grade and for 345kV 18ft etc, but I don't know how these numbers are derived. Any help or...