Oil insulated switchgear

[Muhaimin]

Hello everybody,
i'm new graduate enginner. I'm looking more information about oil insulated switchgear. i have done a lot of research but i don't cross many information about this type. i only cross with these (please correct if i'm wrong)

There are three types:
1)Oil circuit breaker
2)Oil link unit (OLU)
3)High fusing unit (HFU)

Difference between OLU and HFU is OLU is not having fused but only have busbar. For the oil insulated switchgear the busbar is immersed in the oil. The purpose of using oil is to avoid sparking effect at the busbar when the breaker is operated. If there is no oil and the breaker is switched on or off, then there can be sparking effect. This sparking affect can melt the busbar and can cause explosion. The oil used is silicon based oil (Hyrex).

Can any body direct me to better explaination?

 

[RRaghunath]

Muhaimin,

The oil-insulated switchgear is now obsolete. The current technology uses SF6 gas or Vacuum as interrupting / insulating medium in the switchgear.

You can find plenty of literature in the internet search on this type switchgear.

 

[rbulsara]

Muhaimin:

To help others to help you better, please post more information as to:

What country you are in.
Why you want to know this info.
What is the application (type of facility, systme configuration, indoor/outdoor etc).
Voltage, current rating etc of the equipment you are interesed in.
If you are trying to match exisitng equipmnet post any nameplate information of the existing equipment.

 

[powerjunx]

Muhaimin,

SF6 is preferred to most industries as to date rather than oil.

rbulsara, has the point but not much needed why you want to know? We're not promoting products or something to do with marketing here.

 

[waross]

Hi fbcybil;
I think that rbulsara's questions are valid.
This is an international forum.
Switchgear design is dependent to some extent on local codes.
Common switchgear practice varies from continent to continent.
Common switchgear practice varies even more at different voltage levels.
I notice that the more effort and information that a poster is willing to put into a question, the better responses he receives.
respectfully

 

[dmpavey]

The oil circuit breaker used oil as the insulating and interrupting medium. The breakers usually used a dashpot to direct the flow of oil towards the breaking contacts. As they moved apart the arc was drawn in oil. The combination of speed of opening, oil insulation qualities and the gas produced enabled the arc to be interrpted safely. Because the interruption was in oil the oil would be contaminated with carbon by products and needed regular changing.
Normally the circuit breakers used standard transformer oil not silicon oil.

The HFU / OLU are old products manufactured by Brush / Hawker Siddeley.
OLU - Oil insulated load break, fault make switch
HFU - Oil insulated fuse switch, fault break (though fuse) operation of fuse trips the 3 phase switch

You may find more information from fki switchgear (former Brush / Hawker Siddeley) and Lucy Switchgear who still make oil insulated RMU's (fuse switch and load break switch)