hi all,
The local specification for outdoor control cabinet states that
"The interiors of unventilated metal cabinets (exclusive of internal heat-producing sources) can reach 56°C. The components and its accessories, including cabinets and junction boxes, shall be designed accordingly"
The...
Hi all,
i was involved with testing of a 7.5 MVA, 13.8kV-4.16kV transformer. the following points were noted.
1,The Liquid-Temp Indicator (thermometer)installed was with capillary and not direct stem type. Does ANSI C57.12.10 states that the Liquid-Temp Indicator (thermometer) shall be direct...
We have a requirement for the 480V switchears and Motor control centres to have rating for 65kA (symmetrical) short circuit current and the main bus bracing for 100kA momentary short circuit current (Asymmetrical). I would like to know if the vendor provided 65kA (symmetrical) short circuit...
i have a controlgear rated for 1200A,480v. one of the feeder is a fire water pump.having a FLA of 240A(locked rotor current 1500A Approx. i am extracting the local std requirement for fire pump unit package.
"QUOTE"
The protection schemes for Fire Pump Unit (FPU) packages shall comply...
i have a controlgear rated for 1200A,480v. one of the feeder is a fire water pump.having a FLA of 240A(locked rotor current 1500A Approx. i am extracting the local std requirement for fire pump unit package.
"QUOTE"
The protection schemes for Fire Pump Unit (FPU) packages shall comply...
i have a controlgear rated for 1200A,480v. one of the feeder is a fire water pump.having a FLA of 240A(locked rotor current 1500A Approx. i am extracting the local std requirement for fire pump unit package.
"QUOTE"
The protection schemes for Fire Pump Unit (FPU) packages shall comply...
our local standard requires neutral wire colour code to be white.can somebody tell me if i have to follow this for the neutral of CT's and PT's used for metering and protection.
with reference to the above standard,i have a 2500kva , 13.8kv,480v xfmr with power BIL. para 5.7.2 of ansi c57.12.10 states that a pressure vacuum bleeder is to be provided for XFMR rated 2500kva and above with power BIL. my transformer is sealed type. is the pressure/vacuum bleeder required...
i am using a multilin 239 relay in a MCC to control a motor 185 kw 480v motor. the ground ct used is having a ratio 50:0.025A. the system is solidly grounded. the instalation manual for multilin 239 says that this ct can be used only for resistance grounded system. for solidly grounded it should...
what are the requirements for grounding bonding jumber for the enclosure door of a controlgear. i have 2 cases one with instruments mounted on the door and the other with no instruments mounted on the door except for indicating lamps.
we are using the Korndorfer starting method to start a 16000kw/13.8 kv motor by using three breakers. typical Korndorfer starting scheme has a start breaker,a shorting breaker and a run breaker. see link
http://www.seamanship.co.uk/engineering/EKsamplepages/Motor%20starters.htm
we are taking a...
