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Generator transformer is delta connected in Generator side and Star (Y11) connected on the switchgear side,as per suggestion Y11 can be made Y1, 400A NGR is for Transformer high voltage side(Star). The other two existing TG-1 and 2 are permanently connected thro NGR, 400A. hence for the new TG...

Thank You Gunnar and Scotty for your time and reply. ESW,

we have a power system with 132 kV/11 KV YYnd0 , 20 MVA Transformer and two TG's 12 MW and 16 MW connected to 11 kV with resistance earthing 400 A thro NGR. Now we want to add additional 22 MW TG at the 11 kv level.In order to isolate the earthing of new TG it is proposed high impedence...

Dear All, I am in a stange situation to design a DOL starter for a Matrix controller to be used in aero space application .The Voltage is 3 Phase 200V and frequency range is 360 to 800 HZ and rated current is approximatly 100A. I need to select the Moulded Case Circuit Breaker (MCCB), power...

Hi , I need clarification when I specify accuracy class of a current transformer as 0.3 B 1.8 what exactly it means? Regards ESW,

Thank you all for the sugestion .Initially we decided to proceed with 1000 KVA ,11/6.6KV ,Oil filled tranfomer (assumed 6% impedence) and will review the rating once we get the motor data and cable lengths. Regards ESW,

It will be a DOL starter . ESW,

Dear All, I need to size a step down tansformer for 3 PH, 50Hz ,600 H.P ,6600V motor .The Voltage to the primary of the transformer is 11000V .Please assume typical fault level . Thanks in advance Regards Eswaran ESW,

dkle40h The motor manufacturer is right .it is not advantageous to go for star-delta starter for a higher rating like your case .Also the main problem lies with the voltage selection for this rating of 220KW you should have gone for medium voltage like 3300V or 6600 V .You said that already...

The problem is not with the power/signal cable it is the problem with the Power factor of the motor Check whether the PF improvement capacitor are switch on and working Always maintain the PF above 0.85 (Minimum) the motor load current will comedown drastically if you improve the power factor to...

Hi The operation of Domestic Earth leakage is somethig like this. It is done basically by a device called RCCB ( Residual current circuit Breaker). It basically detects the leakage of current interms of milliamps. Standard is 30mA, 100mA and 300mA. Note that 30mA is more sensitive than other...

please give the rating and voltage details type of protection relay employed and the nature of industry cement/steel/mine/petrochemical possible causes may be 1.Accumalation of conducting dust in the motor terminal boxes 2.loose termination in the terminals 3.sudden increase of mechanical...

There will be termal element which responds to increase in current by virtue of its own property to get heated up in more than rated current and deflect from the normal position which in turn operate the lever and trips the motor zero voltage relese there is no device called like that ther are...

Hi friend , I feel 6.6kv wil be optimal for DOL START what is your power transformer rating.you have to do voltage drop study before going for this option When you have 6,6kv supply 3.3 kv is not advisable because you have breakers in thr market most are 11 kv