Can we enegize a 240MVA 275/132kV step up transformer under no load condition by using the 132kV source due to 275kV incoming line is not ready.
The 240MVA transformer will put under "soak" condition.
BTW, can we use a step up transformer as a step down transformer?
Thanks.
Hi,
May i know what are the advantages using naphthenics base transformer oil compare to paraffinic base?
And, if the specification of transformer bushing power factor is < 0.7% at 20 degree C, what is the correction factor if i measure the bushing power factor at 34 degree C?
Thanks.
I need some information about earthing screen which protect the outdoor equipment (high voltage switchgear - conventional type/air insulated) from direct lightning strikes.
The earthing screen required to cover the whole plant using graphical methods (Rolling Sphere Method).
Appreciate...
Transformer cable box which have two compartment, one is filled with transformer oil (disconnecting chamber) and the other one fill polybuthene oil (power cable box).
Unfortunely, the tranformer oil from disconnecting chamber leaks to power cable box and mixed together with polybuthene oil.
We...
I received a statement from supplier as below:
"GIS MV switchgear shall be used instead of AIS MV switchgear for substation located altitude >1500m above sea level. The voltage correction factor is about 0.7..at this altitude"
Could you please advise this statement is based on what standard...
Could somebody explain why the transformer oil (275/132/33kV auto-transformer) can pass the dielectric test (2.5mm gap) with breakdown voltage above 70kV but fail the moisture content test i.e. sample from main conservator: 16.55ppm & On load tap changer compartment: 27.97ppm)?
Thanks.
Hi, can someone advise me on automatic voltage controller(AVC).
I need to know where can i find this AVC.
The specification for the AVC as below: -
The shunt capacitor shall be equipped with automatic closing and opening control option. A switch shall be provided at the control panel to...
Can someone guide me how to choose the right connectors for 132kV outdoor substation.
For example,from busbar isolator to circuit breaker, what type of connectors and how many spacer needed (for twin conductors)for this arrangement?
In short, i need the details design for the outdoor...
Can anyone guide me on the HV (132kV & 275kV) outdoor substation design especially on the clamps and connectors details the following arrangement: -
surge arrester - capacitor voltage transfomer - line isolator - current transformer - circuit breaker - busbar isolator
FYI, conductor used to...
Why we need to have an isolation current transformer for metering if we using the 600/300/5A, class 5P20, 15VA ring type current transformer for overcurrent and earthfault protection?
