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agreed. i think tonyjony first post is the right one.

Anyone familiar with Neplan? I got a 3 windings transformer rated at 1. 7.6/6.8/0.8MVA, 2. 18/11/0.415kV, 3. Uk(H/X)=12% to 6.8MVA base 4. Uk(H/Y)=5% to 0.8MVA base 5. Uk(X/Y)=7.5% to 0.8MVA base May i know how to translate this to Rated power in MVA. 12: primary-secondary,=6.8? 23...

Hi rcwilson, raghun, sobeys81, dpc: Thanks! My standby diesel genset rated at 11kV, 2.5MVA gounded by 10ohm NER (Earth Fault setting 20% of CTR=150/1). Can i say when my genset parallel with 11kV, 12MVA incomer source gounded by 10ohm NER, considering genset loaded at 2MW ~131.2A. Then assume...

Raghun- The NER for Transf rated at 10ohm /667A and NER for Genset rated at 10ohm/635A. If the unblance occur or with connection of non linear load, may i know how the NER able to limit the zero sequence current? If it able to limit the zero seq current, what will happen to the load and is...

may i know how to prove this 10% of NER rating will be sufficient?

My 11kV Busbar feed by 15/11kV Delta-Start Transformer, Star side Earthed by NER. At the same time another standby diesel Genset connected and neutral point earthed by NER as well. To operate both parallel, what should i set for my Diesel Genset's EarthFault Protection to avoid spurious tripping...

I got my generator data as below but not sure which value to use as Gen. Positive Sequence Reactance. 1.Xd (unsaturated)=2.46pu 2.X'd (unsaturated)=0.247pu 3.X''d (unsaturated)=0.188pu 4.X'dv (saturated)=0.225pu 5.X''dv (saturated)=0.137pu what is the difference between saturated direct axis...

so its recommended to use DC instead of AC? How to overcome the low resistance problem?

Thanks Bill. The transformer rated at 500VA, 415/24VAC installed at site. We are not able to install the strip heater as its an existing submersible pump and the client asking for the heating for the pump(on standby) recently. The only way we can think of is to use the winding as heater. When...

what if i add a resistor rated at 1.6ohm,400W connected in series with following assumption: 1)To maintain existing installed equipment with additional external resistor to limit the operating current up to 75% of rated transformer secondary current(~20A) 2)R=24/(0.75x20)=1.6ohm...

I got a 128.7kW,50Hz,415V delta connected motor with "Trickle voltage heating" method installed. The motor totally enclosed, have very little room available for installation of heater. The heating system consist of Single phase 500VA,415/24VAC transformer connected to two of three winding. A 16A...