DEVELOPMENT CONSULTANTS PRIVATE LIMITED Reviewed for general conformance with Contractdrawings and specifications. ACTION : 31 Approved 4 Disapproved. 2Approved except asnoted. Forward finaldrawing.5For information/referenceonly.3Approved except asnoted. Resubmissionrequired.6Information category withcomments. Resubmissionrequired. Approval of Contract documents by the Consultant shallnot relieve the Seller of his responsibility for any errorsand fulfilment of Contract requirements. Digitally signed by Santanu Chakraborty DN: cn=Santanu Chakraborty, o=DCPL, ou=Power Cell-B, email=santanuc@in.dclgroup.com, c=IN Date: 2015.02.23 16:54:05 +05'30'SL.NO TECHNICAL PARAMETER UNIT Guaranteed Technical Parameters 400kV SF6 Circuit Breakers1 Name of the manufacturerCrompton Greaves Ltd2 Manufacturer's designation 400-SFM-50AA3 Reference standard IEC-62271-1004 TypeSF6, Individually operated single pole type5 ServiceOutdoor6 Pole Nos.3 Single Polea) Nominal / Maximum Voltage kVrms400 / 420b) Rated voltage kVrms4208 Rated frequency Hz50Hz 5%9 Continuous current at 50C Amps Upto 315010 System Neutral earthing Effectively grounded.11 Standard to be followedIEC-62271-100Classa) Mechanical Endurance ClassM2b) Electrical Endurance ClassE1c) Restrike Probability ClassC113 Electromagnetic Compatibility(EMC)As per IEC14 Rated Insulation LevelRated Lightning Impulse withstand voltage a) between phase to earth kVpeak 1425b) between phases & CB open kVpeak 1425c) across isolating distance kVpeak1425 (+240) *Rated Switching Impulse withstand voltage a) between phase to earth kVpeak1050b) between phases kVpeak1575c) across isolating distance kVpeak900 (+345) *Rated one minute Power Frequencywithstand voltage KVrmsa) between phase to earth kVrms520b) between phases kVrms520c) across isolating distance kVrms 610 for two breaks / 610 x 0.55 for single break15Corona extinction voltagewith CB Open or Close in normalatmospheric condition KVrms (min)34616Maximum radio interferencevoltage level at 1.1 Urated/3 Micro-Volts