BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

. Rated insulation level- Lighting impulse withstand voltage :.1050 kV peakFull wave (1.2 / 50 micro sec.)- Power frequency withstand voltage : (As per relevant IEC) kVfor one minutec. Rated frequency :50 Hzd. Rated burden- Secondary : (As per relevant IEC) VA- Tertiary : (As per relevant IEC) VAe. Accuracy class :1.0 (secondary):3 P (tertiary)(4) Requirements for Design and Constructiona. The voltage transformers shall be of hermetically sealed andaccessories shall be of weatherproof type. The glazing colour shall be of brown.b. Creepage distance of bushing shall not be less than 25 mm / kV of phaseto phase voltage.c. A protection device shall be provided against short circuit of thesecondary circuits of the voltage transformers.Unless otherwise specified, the characteristic and others shall comply with therequirements of IEC 186.(5) Dielectric Test Voltagesa. Power frequency withstand voltage: (As per relevant IEC) kV for oneminute on primary windingsb. Lighting impulse withstand voltageFull wave (1.2 / 50 micro Sec.):1050 kV PEAKc. Power frequency withstand voltage :2.0 kV for one minute.on secondary windings(6) AccessoriesThe following accessories shall be provided for each voltage transformer.a. Nameplatesb. Grounding terminalsc. Lifting lugsd. Steel supporting structure with anchor bolts and nutse. Junction boxesf Conduit pipesg. Other necessary accessories, if anyGhorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)62