Charging a 220-KV Line at 33-KV

At much reduced power, maybe, though the voltage drops might not be acceptable at the lower supply voltage, perhaps.

Using the TL at 33 kv should be no problem. Did that once. Are you installing a neutral? Calculate the voltage drop for the load you have. 53 km is a long way.

Just convert it to miles. Then you only have to go about 34 of them!

Ask NASA how that works!

Thanx for the response guys. Yes, we'll have 8%(approx.) voltage drop and we'll have to absorb it at our end. But I suppose its better to sell some power than wait for the entire duration (6-8 months)for commissioning of the new substation??? Can someone throw some light about the line charging requirement?

You can install some pole mtd regulators to correct the 8%.

Charging 220 kV line at 33 kV, will enable you to transmit a max. of 4.95 MW power. Is it worth the call, after having to change the CTs, PTs, costly transformer too?

Calculations as follows, for 33 MW of total power -

P=sq.rt.3*V*I

At 220 kV, I = 3*1100/(1.7321*220*0.9), I have presumed 0.9 pf. = 96.222

Therefore, at 33 kV, P = 1.7321*33*96.222*0.9 KW = 4950 kW = 4.95 MW.

Thanks and regards

Ashok Toshniwal, Bangalore, India

Rajfab Quote " Can someone throw some light about the line charging requirement?"

Take all the load off the line and go for it.

I believe you do not need to spend much to cater to this temporary measure.Perhaps some short length cables 220kv terminals to 33kv switchgears.You can sellect the tap changer position (OLTC)on the primary sides of 33kv or 11kv transformer to correct the voltage drop without extra cost.CT metering at 33kv panels will be accurate. The live transmission line will make cable theft more difficult.

Khor