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At an installation there is a 400v, 50Hz, 3 ph,4wire, DB with a Fault Level of 35kA. It is fed from a 1MVA, 11kV to 400v, DYn11 trf. This DB feeds a 40kVA, three phase, UPS device. In the Main DB the breaker feeding the UPS is a 125A thermal magnetic MCB set at the correct levels. No earth...

I have a problem explaining the problems of running three phase motors with capacitors on or near the connections and at a leading power factor. I have read it here but I lack the comprehension to explain it to someone else. Please can someone assist with the problems with this type of running...

I was in a discussion: http://www.eng-tips.com/viewthread.cfm?qid=368907 ...and the consencus was that placing a capacitor at the motor terminals does not increase the inrush current. I can't find it so .... Here is a link: http://ecmweb.com/content/correcting-power-factor-your-motor-terminals.

Country: Malawi Soil Type: Sandy. Earthing network: Tested every year. No problems. Transformer: Siemens. Gefol. 2000kVA. 3.3kV to 400v. Dyn11. MV Cable is PEX. 90 meters. MV protection: Reyrolle 2DCC IDMTL Fault Level 19.77kA CT 400:1 θA = 105 θC = 105 Earth = 15 LV MCA breaker...