We use ungrounded DC system (220V/110V) for control and protection system in substations etc. Suppose we have long 2 core DC cables running from our DCDB in control room to the load (length of around 2 to 3 km). Do we need to protect these long DC cables from earth leakages or not? If yes how?
5 10289WHAT IS DIFFERENCE BETWEEN MANUAL CONTROL AND MAGNETIC CONTROL AND STATE ITS ADVANTAGE /DISADVANTAGE
1584earth-fault relay is? a)directional relay b)non-directional relay c)protective relay d)admitence relay
2 5585why anti pumping relay is not given to tripping coil of the breaker? why only to closing coil?
2 5237What is the basic principle of vibration measurement by BENTLY NEVADA vibration measurement system? and Why it gives the -ve voltage output?
14 130766I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?
1786what are the precuation should be taken ahen installing power transformer,circuit breaker,current & potential transformer
1593in a dc motor we supply current only to the armature conductors,from where is the field winding gets excited then??
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