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Dear all thank you for your instruction , the transformer had been in service since 2004 . I am not sure a bout the CTs although I make current injection to check the ration ,I want to be sure 100% that CTs are okay ,what other tests that I can do (like saturation test!!)? Emad Shaaban...

Hello Step-down transformer (20kv /6.6KV ) 22MVA CT ration 2000/1, was tripped by (Sepam 2000) differential Protection Unit . I've measured the Transformer insulation resistance for both primary and secondary side ,all results was great 7 G-ohm. I've primary injected current in CTs ,all CT...

second sketch Emad Shaaban Tripoli Libyahttp://files.engineering.com/getfile.aspx?folder=fe2b9d21-ad7e-478e-8572-903fc3f3fdde&file=Aman_Phone_1.jpeg

DEAR MR DAVID I tried to get what you've meant by " ground toward Gen & ground toward Trans" can you give me more clarification I attached to sketches of the new and old CT connection . first sketch Emad Shaaban Tripoli...

Thank you for your replies , -Mr davidbeach 1) you may not noticed that I mentioned it's a step up transformer ,it is clear what I meant by "primary" 2) why the current at 87G and 87T will have 180 degree out of face? Emad Shaaban Tripoli Libya

Dear all experts we are swapping a step-up power transformer of (35MVA 11kv/20kv) that has been defected due to low winding Insulation , but we are facing: The old Transformer is provided with CT in side the primary winding of the Oil Transformer connected to relay 87T (SEPAM 2000) but...

dear (prc); they reason of replacing transformer is because of Differential protection trip and the insulation value was 200 kohm, but now when we disconnect the defected transformer the disconnected cable insulation value was : L1 24 G-ohm L2 31 G-ohm L3 1.6 G-ohm before swapping the new...

hello we have got multi function protection relay (SEPAM) I need to test saturation point of the core balance current transformer using current injector, what is the procedure

Thank every body for your help We've check the cable lugs but there are no sighn of any damage . Does the cable of 1.6G ohm for 20kv is acceptable or not?

hello for all Our step up power Transformer 11kv\20kv 35M va was defected due to low winding Insulation resistance Now we are swapping a spare transformer to be fixed , but while testing the insulation resistance of 20kv calble it gives: L1 24 G-ohm L2 31 G-ohm L3 1.6 G-ohm Does it mean cable...

and you may know that the trtansformer is internally connected in (Y/delta) for (11/20kv)

Thank you for your fast reply.. I will apply 380v in 20kv side but do I need to short the 11kv winding to measure the current or I measure the voltage only .

hello An electrical oil transformer of 35KVA step up 11KV/20KV has tripped by -bucholoz relay -differentiation protection -50N An Insulation test for windings gave : 170 Kohm in sec / 4Mohm in primary Oil Dielectric test tripped in 13KV.. after oil regeneration done : Oil Dielectric test now...

Thank you for the perfect reply.[dazed] Would the unbalance load distributing over the 3 generator phases make any effects for the gen- ?

Hello If you have got a 3phase generator and you've used it to supply a single phase load (you can not share the 1ph load into the 3 generator phases ) can you get the maximum power out of the generator or you can get 1/3 of full KVA ?