Hi there,
Some of the traditional methods for reducing arc-flash is to have to bus differential protection for quicker tripping and at times reducing incident energy on the bus.
Now, as far as I know, most of the electrical softwares (EasyPower, ETAP and SKM) allows you to model only...
Hi there,
What are the standard formulaes used in desiging an outdoor 44kV current limiting reactor in a substation. Downstream of the reactor is a solidly grounded 44/26kV, 10MVA distribution transformer. Happy if someone could refer me to a section of a book, IEEE or CSA standard?
The...
Hi all,
How do I calculate the capacitance for a oil-filled transformer and power factor correction capacitor bank. Any reference to texts or IEEE standards will be helpful.
Thanks.
Sonic 02
Hi All,
I'm adding four(4) new, 15kV metal-clad switchgear breakers to an existing line-up. I plan to utilize DC power for the tripping, closing, spring-charging and protective relay. Now, my concern is whether the existing battery cells have the adequate capacity (i.e. battery voltage)to...
Hi All,
First question:
We have a new 500kVA, 13.8kV/600V dry-type ventilated transformer to be installed in a new electrical room. The dimensions of the electrical room is sufficient so real estate is not a concern here. My main concern would be the most ideal location of the transformer...
Hi All,
We are planning of installing three(3)- single-phase,25kVA, 13.8kV/600V, pri- Delta and sec- wye-grounded pole-mounted transformer for our system. For protection on the primary-side of the transformer, I was wondering if I should spec out a self-protected transformer in which the surge...
Hi there,
Can you run 1kV,teck 90 3C#1 AWG power cable, a 4/0 AWG grounding conductor and Instrumentation Cables (in a 4" rigid PVC conduit) in the same trench as mechanical hot and cold water pipes?
Sonic
Hi there,
A quick question on disconnect switch. Can we utilize a 25kv outdoor disconnect switch on an existing 13.8kV line ? I know that 13.8kV disconnect switch exists but the client had purchased a 25kv disconnect switch instead.
Want some thoughts on that..
Sonic
Hi there,
Out client has a arc-resistant 4.16kV Medium Voltage Motor Controller in a seperate electrical room which is located in a larger compressor room. This controller has a plenum at the top to direct any arc-flash to a safe or controlled environment.
My question is with regards to the...
Hi there,
We are planning to install a 5kV TECK 90 Cable buried in a cable trench. One of the client requirements is that any cables buried in a cable trench in a vehicular area needs to be installed in a rigid steel conduit.
Now, my question is whether a 5kV TECK 90 cable can be installed in...
