Oil Interceptor Tx, ETx, NER, NCTx

[Linspire]

Hi,

Do you guys have picture for oil interceptor for Tx, ETx, NER, NCTx ?
Because I'm curious how does RC sump actually help prevent for oil leaking ?
Mayb perhaps inside the RC sumpm, there is a drain which leads the leaking oil to the oil interceptor.

 

[dpc]

I know we are all busy, but please spell out all of these abbreviations if you expect anyone to try to respond to this.

 

[Linspire]

Alright, noted, I will stated clearly in the future.
Here's full names for each abbreviation.

Tx - Transformer;
ETx - Earthing Transformer;
NER - Neutral Earthing Resistor;
NCTx - Neutral Current Transformer.

 

[dpc]

RC = Radio-Controlled?

 

[Linspire]

Opps, sorry, missed out RC sump.

RC Sump - Reinforced-concrete sump.

 

[prc]

Please refer to following IEEE standards : 980-1994(R2001) Containment and control of oil spills in substations, 979-1994(R2004) Substation fire protection, 1127-1998 Guide on the design ,construction and operation of electric power substations for community acceptance and environment compatibility.

 

[ScottyUK]

Not really certain I understand the question.

Large transformers are usually provided with a bund which is large enough to contain the entire liquid volume plus 10% or so. This bund will theoretically be able to deal with a catastrophic failure of the tank resulting in rapid oil loss. Many bunds on industrial sites are connected into an oily water drain (OWD) system. It is unlikely that the OWD pipework could cope with a gross failure of a large transformer tank, so the bund acts as a buffer tank. Most OWD systems have a sump somewhere which also acts a buffer tank for the separator which is normally employed to remove the bulk oil prior to treatment.

 

[Marmite]

It's interesting to see the different approaches in use. The Companies I worked for in the UK used a sealed reinforced concrete bund designed to retain the full amount of oil, plus a percentage extra for fire fighting water. The bund was essentially a large concrete swimming pool with an intelligent float operated bund pump to pump out any rainwater when required, but not oil into a separator. The bund pump alarms to scada if it detects oil or fails. I now work in Australia where the Company I work for uses the same kind of bund, but the outlet is normally open, and any water/oily water drains freely into a series of interceptors. If the transformer Buchholz or PRD operates, a valve closes to seal the outlet of the bund. My preference is the first method as it fails safe in the advent of a real emergency. If the bund pump fails during normal operation you can fix it as a planned maintenance activity. If the bund valve fails during an emergency you are relying on the interceptors to stop the oil.
Regards
Marmite