BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

(5) Control circuit isolating connector shall also be provided.(6) Clearly labelled mechanical interlocks shall be provided in each circuitbreaker compartment to prevent:- a close circuit breaker from being withdrawn from or inserted into theisolating contacts;- A circuit breaker from being moved into any location unless it is fullywithdrawn:- a circuit breaker from being inserted into the fixed position unless thesecondary isolating contacts are fitted.- a circuit breaker from being closed except when fully inserted or fullywithdrawn:- a circuit breaker from being inserted into the fixed position unless thesecondary isolation contacts are fitted.- a circuit breaker from being closed except when fully inserted or fullywithdrawn:- a circuit breaker from being inserted against a locked safety shutter.7) A common earth bus bar shall be provided in the switchgear. The bus barshall consist of one copper8) All secondary wiring shall be terminated on terminal blocks in an enclosureseparate from the high voltage compartment.4.3.4 Circuit BreakerThe circuit breaker shall be of SF 6 gas type only.The circuit breaker shall comply with the requirements of IEC 56 and the relevantrequirements of these Specifications.- Rated Voltage :11 kV- Rated Current : 10 kA- Interrupting Current : 80 KA (rms) or higherOnly fully type tested circuit breakers complying with IEC 56 will be considered,and a statement as to the availability of certificates of all such type tests includingimpulse tests on identical or similar circuit breakers shall be submitted withTender.4.3.5 Current TransformerThe current transformers in the generator switchgear shall be of the epoxy resininsulated and of the bar or wound primary type. The ratio, rating, polarity andaccuracy classes [tariff metering] of current transformers shall conform to IEC185.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)39