Helical speed reduction gearboxes H4 al ropeways Tbar lifts Continuous rope H4-FV-25-A

Flender/Flender Gear Units/Helical speed reduction gearboxes H4

lar tap . Permissible maximum temperature at rated output and principal ap over an ambient temperature of 5 0C. Top oil (by thermometer) : 3C Windings (by resista nce method) : 4C Maximum Hot spot temperature : 5C Transformers shall be designed to withstand the thermal and dyn amic stresses due to short circuits at its terminals. Unless otherwise specified the duration of short circuit shall be as per IEC. However design calculation shall submitted considering 5 sec onds duration. Disconnecting chamber at the cab le terminal box shall be provid ed. Magnetic Circuit shall be made of low loss CRGO silicon steel shall be used. Laminations shall be annealed in non-oxidising atmosphere to relieve stresses and restore the original magneti properties of CRGO sheets aft er the cutting and punching operations. Flux density at normal over voltage or frequency shall be such that under 1% over voltage condition it sh all not exceed 1.6 tesla. OLTC shall be provided wit AVR and LDC in Auto mode. Frequency response analysis shall be done on each of the Transf omer during routine testing. Over voltage capability of the transformers shall be as per IS and shall match with the connected equipment. Windings 1 of 1 INDRADHANUSH GAS GRID LIMITED TECHNICAL SPECIFICATION FOR NATURAL GAS COMPRESSOR STATION FOR NORTH EAST GAS GRID PIPELINE PROJECT ______________________________________________________________________________________________ TS NO.: MEC//2UU/0/2/0 Electrical system Chapter-0.0 2, MECON Limited, All Right Reserved Pag 5 of 2 Material shall be electrolytic rade work hardened copper of hi gh proof stress with more numbers of radial supports. Completed core and winding sha ll be vacuum dried in full vacuum and impregnated immediately. Insulating materials shall be compatible with transformer liqui under all service conditions. Leads to the terminal board