Helical speed reduction gearbox H1 flender corporation H1-SH-11-D

Flender/Flender Gear Units/Helical speed reduction gearbox H1

_______________________________________________________________________ TS NO.: MEC//2UU/0/2/0 Electrical system Chapter-0.0 2, MECON Limited, All Right Reserved Pag 9 of 2 Rack in / out of circuit breaker from isolated to test as well as test to service position and vice versa shall be allowed only with door closed. Door interlock shall have defeat feature. It shall not be possible to open the circuit breaker enclosure when the breaker is ON or to have access to any part of the draw out assembly which is live when the circuit breaker is the service position. Remote closing of breaker not permitted with door open. 1.4 Microprocessor based releases General ) The micro processor based release unit shall be interchangeable on site for adaptation to changes in the installation. ) Sensors used shall be non-magne tic or of the Rogosky type for ccurate current measurements. This will have tapping match the actual load current ) The release shall measure the true RMS value of the current. ) The release shall have thermal memory to store temperature rise data in the event of repeated overloads or earth faults. It shall be possib le to disable this function if necessary. ) The display on the release shall be functional even after failu re of complete power supply to the power bus. For this, either inbuilt rechargeable cells or external UPS supply shall be used. Protection The release shall offer the fo llowing protection functions as tandard. The tripping curve shall be site selectable to achieve total protection disc rimination. ) Long-time (LT) protection with adjustable current setting and time delay; ) Short-time (ST) protection wit an adjustable pick-up and time delay; ) Instantaneous (INST) protection with an adjustable pick-up and an OFF position. ) Earth-fault protection() with adjustable pick-up and time elay shall be provided. Current and