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Dear guru; There is a mixer motor 75 kw runing with VSD. But having some high vibration at 40-50 hz. We are suspecting that may be bearing problem. Currently,this is single taper bearing but client advise to change to both taper bearing in x shape?? Please advise whether we need for both taper...

Dear Guru.; Anyone please advise me. There is one street lighting panel main CB 100 A. The problem this main CB always trip via ELCB 30 mA. My concern is we required ELCB (earth leakage CB) for this main CB or not,every Street lighting pole already had connected with earting cable 16 sq.mm...

Dear Guru; my concern is PTC for varispeed motor(VSD application) ,Please anyone advise what min sizing VSD motor required for PTC? Or which technical basis or international standard mention on this. Appriciated for you advise.

Thank you all jraef, I can find it but delivery time is too long.

Any goru, please advise.any standard mention one or two hole for cable lug, currently I need to use cable lug for 300 sq.mm at secondary side of transformer 400V. But the transformer busbar provided for 2 hols cable lug, but I can not find it, I need to convince to our client to use one hole...

We had power transformer Delta/Y 11kV/6.6 kV and supply to 6.6 kVSwitchger. Due to in 6.6kV switch gear without netrual busbar, Please advise that we need to connect earth cable at transformer star point or not?AND THE RELAY 51 G Is required for VCB at 6.6 k V downstream or not? Relay 50/51 and...

Dear Guru, Our LV system is 400 V, but there are many outgoing feeder very far from substation. I am worry about the voltage drop. please advise what the suitable voltage value at MCC should be by change at tap changer. Such actual 400, 410 or 420. If change the voltage ,is it affected to...

Dear Guru there is impress current type of CP. Now already install MMO anode with cable to the positive JB. please advise what the voltage level that we can test insulation test for cable with anode. I am worry if i apply high voltage such 1000V then will damage the anode. Thks

Thanks for your answer. I measuring current.

Dear Guru, just need some help concerning unbalace load in 3 phase system. Nomally, I saw only magtitude different between 3 phase but today after check at site on MCC. I fould the angle diff between Phase A and B is 120 degree but the problem in between A and C is 127 degree why not 120 what...

Plase help me There is Transformer 2000 kVA, 11kV/420kV, and Tap changer in primary 5 step +/- 5%. So now we having a overvoltage 418 Vac at MCC now (operation voltage 400 V) please advise how I can make a reducing voltage to 400 Vac at MCC. Thanks Junior Engineer

Anyone please me, The problem now we encountering RTDs of the11kV motor 280 kw EExn fail(disconnected ,resistance between active and common is open,actually should be 100 omh.) please advise what can we do to solve this problem without send it back to manufacturer. And atualy per IEC...

Anyone help me, whatis voltage level to check insulation resistance for anode with cable and earth for cathodic protection.,nomaly this anode for positive ptention from rectifier 50V. Thank

Anyone please advise there is a terminal bock inside lighting junction box EEx'e' installing in Hazardous area. I need to know that require pin lug for cable connection in this terminal blocks or not? And If without pin lug what will happen when energise. Note this terminal block is screw type...

Anyone, If I have AHU(For HVAC made from steel) on the flat roof of substation so please advise that we would need Air Terminal on the roof or we just use AHU instead and connect to bare copper directly to earth. Thanks

If we need to start for so-lo run Compressor 2600 kW ,11 kV. How big diesel generator, we need to prepare for testing. Thanks

Hi Guru, we found on transformer 2500 kVA 11kV/0.4 kV,Seal Type,ONAN Insulation test between secondary with Earth is failed(Reading near zero)but another test such Ratio, DC Resistanceand insulation in primary side are O.K., So what happening with our transformer. Thanks Young Engineer

Hi any guru, We need to supply load that Nominal load only 32 A. Tthere is Main Juntion Box(3 phase)that will distribute to 3 Sub Juntion Box(each phase. Base on Cable Datasheet; 4C-6 sq.mm. can carrying 61A. 2C-10 sq.mm. can carrying 81A. If I used cable incomer for main junction box(3...

Dear guru, We have a fan motor but the problem is motor starting winding failed So we need to start by manual only. Please any advise what we can we do for this ? Only change capacitor or do new winding ? Thanks for your share knowledge Young engineer

The transformer damaged and We found a lot of water in side transformer after we did detank in factory. We tried to investigate the reason why water ingress to transformer. Many time we found the water accomulated the bushing box as this cable box didn't follow IP54 and I suspected that water...