GIL Vs GIB

Dear Deepak,

Kindly clarify the abbreviation "GIL" stands for what? I believe that "G" stands for Gas; "I" stands for Insulated; however, "L" needs to be clarified.

Please note that there are two common ways to connect the Gas Insulated Switchgear "GIS" to a transformer and/or OHL. Either through cables to be connected to the GIS via Gas Insulated Cable Sealing Ends, or via Gas Insulated Busduct "GIB". The later is the most commonly used method because it is safer, more reliable and durable, and requires no maintenance.

The GIB is to be connected to a transformer through SF6/Oil bushings; while, SF6/Air bushings are to be used for the connection to Overhead Lines.

I'm sorry, as I cannot help regarding the cost difference; you may refer to GIS and Cables manufacturers. However, I'm sure that the running cost of GIB is much less than for cables.

Regards,

With GIL we mean gas insulated lines.

Hello, did you get your reply? I saw your query belatedly. GIL--Gas Insulated Line GIB--Gas Insulated Bushing. GIL--is used like a cable to transport power to a location.In GIL bulk power can be transported. GIB--It is the bushing to connect a cable to a transformer or GIS breaker.It is for space savings by avoiding conventional structures.

Hi, yes I received the reply.. Many thanks. However, I've a comment on your clarification regarding the GIB. GIB means Gas Insulated Bus-duct. This GIB is busbar (normally made of AL), enclosed inside an enclosure filled with SF6 gas. It is used either to connect the GIS with transformers or overhead lines. The interface between the GIB and transformer is SF6/Oil bushings; while, it is SF6/Air bushings in case of overhead line.

In case you are going to use cables instead of GIB, the interface between the cable and GIS equipment is SF6 Cable Sealing Ends (CSE), while it could be either cable box filled with an insulating media, or conventional cable sealing ends at the transformer side.

Again, thank you...wishing you and all of our colleagues in this forum a Happy New Year.

Best regards,

<...How does cost of equivalent XLPE cables (simialr current carrying capacity at 400kV) compare to GIL on per kilometer basis...>

CR4 doesn't do commercial stuff. The best thing to do is leave the entire question in the hands of a Purchasing Officer within the organisation, and see what that individual can come up with.