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Can someone explain in detail what are the field tests which can be carried to confirm anode material(We are using imressed current anodes for tank bottm protection-mixed metal oxide anodes)before installtion.i know we can get the material confirmation certificates from manufucturer. Whats are...

Querry for the experts: How much short citcuit current that delta-delta transformer can supply during the fault to decide the ground wires sizing?

Recently we recieved one medium voltage feeder panel(13.8kV,60Hz system) where Common protection class Ct's used for protection relay(multifunction relay which has the facility to read currents,voltage etc)and ammeter with selector switch.Does ANSI/IEEE stanadrd allow such panel wiring?Is there...

We ahve delta - delta connected transformer and secoindary is connected to 480volts,3phase,60hz ungrounded Motor control centre(M.C.C).In this type of system what should be protection requirementin the starter compartment for 3phse,60hz.460Volts motors(Motor horsepower rating varies from 3HP to...

Dear wareagle i mentioned that, cable is layed and buried underground 1.5 meter deep.What about splicing clearence required between 3 cables layed about 150mm apart?cable laying experts guidence please .....

We plan to lay 3Runs of 15kV grade Cu/SC/XLPE/SC/Cut/PVC/SWA/PVC cable in umderground.Cable length is about 2500Mtr and Cable drum length is 500Mtr.So obviously it requires splicing.My question is whats the clearence required between the cables at splicing place and does that splicing should be...

Thanks Mr.Bulsara ..i am looking specifiic values alloawable ..if u find something in NETA please send me the copy ....

WE are carrying out installationg and commissioning test for medium voltage(36kV) grade Cu/XLPE/SC/Cut/PVC/SWA/PVC cable thru DC Hipot test kits. Cable lengthe are varying as per site condtion from 100Mtrs. to 2500 Mtrs.I would like to know the allowable leakage currents(milliamps) during this...

Mr.RalphChristi -Thanks for your resposne.Our proposed feeder modificatin voltage level is 13.8kV,60Hz system.Yes we have overhead lines in the downstream side as well.Bascically these overhead lines are connected to wellhead ESP motors (Oil field electrifications).We plan to provide latest...

Addition to baove question:We have solidly grounded system of earthing.

Presently we are upgrading one of the feeder and connecting 4 Nos. 3CoreX300 Sq.MM cables, so we have problem of installling core balance CT.Whether we can install core balance CT in one of the cable so that it will serve the purpose of zero sequence earth fault protection?What about residual...

Does Main incoming breaker 1200 amps rated, should be provided with undevoltage(27) and negative phase sequence protection circuits?MCC is feeding 460Volts motors maximum rated 100HP,other small motors and lighting transformers and DB's.

Respected Busbar I am working for a construction company in oil industry,installing these transformers for oil well downhole electrical submersible pumps. I have to approve factory test reports of these transformers prior to shipment from the factory.I have sent same querries to...

Can some one provide me or refer specific IEEE standard for the nominal values of routine test results required for oil immersed type,distribution tranformers(I am specifically looking the values of no load loss(Watts),Load loss(watts),Total losses(Watts),excitation Cuurent(Parecentage...

One of the cable manufacturers catalogue specification says 3C,Cu?XLPE/SC/Cu-tape screen/SWA/PVC rated 18/30kV(36kV) manufactured as per IEC-60502.Can i use this cable for 34.5kV rated system. What does their specified 18/30kV rating means? What does the above IEC standard says? Can some experts...

One of the cable manufacturers catalogue specification says 3C,Cu?XLPE/SC/Cu-tape screen/SWA/PVC rated 18/30kV(36kV) manufactured as per IEC-60502.Can i use this cable for 34.5kV rated system. What does their specified 18/30kV rating means? What does the above IEC standard says? Can some experts...