H3-KH-25-D flender interview questions Helical gear units H3

Flender/Flender Gear Units/Helical gear units H3

Electrical system Chapter-0.0 2, MECON Limited, All Right Reserved Pag 5 of 2 Terminations It shall be possible to withdraw the transformer easily after isconnecting the connections without disturbing the OH line/cable/busduct termin ations. For cable termination, air insulated cable box shall be provided which sh all be suitable for the type and number of cables specified. Cable end box shall be self-supporting. For OH line termination, proper bushing shall be provided. For bus duct termination, proper matching fla nge arrangement shall be provid ed. Bushings Bushing shall conform to IS 3 and 2. Clamps and fittings shall be made of steel or malleable iron shall be hot dip galvanized. Neutral bus provided as required for earthing of neutral point. All the HT bushings shall be provided with suitable co nnectors and clamps. Minimum rated current of line bushings shall be 1.5 times rated corresponding windings. Bushing rated 4A and above shall have non-magnetic clamps and fittings only. Creepage distance for the bushing shall not be less than 2.4mm /kV of the higher system voltage. Bushing Current Transformers Bushing CT shall be removable at site without opening transform er tank cover/active part. Secondary leads of 4mm 2 shall be brought to weatherproof terminal box and from there to the marshalling box. Oil temperature Indicator (OTI) / Winding Tempera ture Indicator (WTI) Digital display type thermometer nd trip settings, manual reset and maximum reading display. There shall also be wo independent potential free contacts for alarm and trip signals. Marshalling box All outgoing connections from the transfor mer .. buchholz rel ay, temp. indicators, level indicators, CT secondary, alarm contacts for annunciation , etc. shall be wired to marshalling box. Degree of pro tection of enclosure shall IP 5 class.