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A core balance ground ct connection was used in O/L in a Motor, while residual ground CT connection was used for O/C at the secondary side of Transfomer going to the switchgear where the motor connected. My question is, can I coordinate the two relays? What is more sensitive during ground...

Hi everyone, Can anyone direct me to supplier for a Generator Tubular Busbar? Thank you.

Does anyone have a copy of manual for SR469 relay?

Can anyone help me how to compute the relay pick up, time delay and instaneous setting, to tell you the truth I dont know how to deal with it. Hope you can help. Thanks. S4-S1-SA, upstream. S4: CT Ratio 1000/5, Full load amps: 710 Amps,SCA-3p: 21,208Amps S1: CT Ratio 2500/5, Full load amps...

Can you suggest what is more advantage or helpful in Transformer testing, doing insulation resistance test or insulation power factor test. Thank you.

Hi, Anyone can provide me some formula or computation why a L-G fault is higher that L-L fault in distribution system mostly with XLPE feeders? Existing Transformers are solidly ground. Thanks

Hi Guys, I need a help in looking for a procedure on how to set an earth fault relay What are parameters needed, (eg. short circuit fault, etc..) Thanks.

Hi All, We have a SEL 121G for lab use, but my problem is I dont how to test it, does anybody have test procedures on this relay using doble f6150?

What is the effect of Hydrogen in tranformer Oil? How hydrogen form inside the transformer? I hope you can help me on this.. pabs

Can anyone provide me supplier for the wire rope use in a KRUPP Crane. 80Tons, Capacity with 3/4" dia. I will appreciate your help.

Is there a need to conduct Reduced Voltage Trip and Close Coil Testing on circuit breakers? What maintenance is necessary for tripping and closing coils of circuit breakers? What are their current maintenance practices in trip/close coils? Any IEEE/ASTM Standard related to trip/close coils testing?

Does anyone have a formula in calculating the inrush current for Capacitor Bank. The scenario is: there are two Capacitor Banks connected in parrallel, in each bank there is a series damping reactor connected. Thanks.

Any one can explain to me what is the use of Neutral in a autotransfomer? I have an Example: 200MVA,Single-phase Autotransformer with tertiary, Y-connected. 500KV-primary,230kV-secondary and 13.8kV.(a),(b). My another question is: if the neutral-wire going to diverter switch will cut off, happen...

If the transformer of a substation had a capacity of 60MVA/80MVA/100MVA; OA/FA1/FA2. Can I say that it is a 100MVA S/S? Could anyone can explain to me if this right or not? Your reply is highly appreciated.

I am looking for a complete Power Transformer testing instruments.. please specify what brand. Eduardo

Could anyone can provide me some of their experience of Transformer Bushing Failures manufatured by Haefely Trench. We are preparing a report regarding our 100MVA Transformer that was totally burnt due to bushing failure recently. eduardo

Anyone knows an instrument use to measure actual core loss, copper loss of an existing transformer..

Anyone can help me to know the bushing specs(primary & secondary) of this Transformer. Daihen Transfomer, formerly OSAKA Transfomer CO., LTD This transfomer is very old(1976, its manual is lost already. Here is the Transformer nameplate specs. KVA Rating: 67700 Phase: 3 Class: OA Serial #...