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Can I install an exe motor in a zone 1 area.

Kiribanda,Thanks for the info.We have very large harmonics due to the running of a VFD to control a 800kw maotor.We have a passive harmonic filter in place which controls the high fifth harmonic, it reduces from 40% to about 9%.How would I measure the fundemantal frequency and what affects would...

We have three generators feeding in one main switchboard with the neutral connected connection to earth at the switchboard. Each generator has six 300mm cables per phase and three 300mm cables for the neutral The cables are glanded through and non ferrous plate at the generator and all the...

Can anybody send me a commissioning proceedure for the energisation of a 440 volt switchboard.

Has anyone had this probelem with a GE 469 protection relay.After a trip from the protection the relay indicates that the moter is still running.If thje relay is de-energised and energised again all is ok.

Can anyone give me the max fault current on the seconday star winding of a transformer.Details below. HV 13.8V delta LV 480V star KVA 3125 5.72% inpedance 60 HZ

We have a switchboard with 2 feeders and a bus tie and and two basler 3 phase diff.relays protecting the switchboard.Every motor feeder has also a ct installed and all are daisy chained together.When starting a 500kw motor on 1 feeder and a bus tie closed the diff relay used trips on all...

Thanks for your fast response.I carried out the mod. this morning and all is now ok.Thanks again. Best Regards Alan Mitchell.

When the local 4kv MCC stop is operated our motor stops as expected but as the stop is not a latched stop as soon as it is released the motor starts again.Is it possible to wire this stop to the protection relay,so when operated it uses the same trip relay as a protection trip and could the...