Answer / rajesh

During faults (short-circuits), fault currents have two
components- AC component (Periodic) and DC Component
(Aperiodic). DC component will be decayed as per system X/R
ratio. circuit breakers are manufactured and tested to
break the fault current of specific AC component (Ib) and
DC component(Idc). Together can be called as Asymmetrical
breaking current.

Answer / vasu

DC component in circuit breaker is not related with trip
circuit system, it is related with making or breaking the
circuit at fault condition.

Answer / prathees

In a circuit breaker, always the trip circuit is DC. And it
is powerd by some battery back-ups or ups.
Because, even is the total power to the substation is gone
by some problems or faults, the trip circuit can be
operated without any problem as it is the safety for all.

Answer / ramesh.k

In circuit breakers having trip and close coils are purely
dc components, some CB's are having antipumping coils also
pure dc components and spring charge motor used as both ac
and dc.

Answer / deepak kumar

In CB basicaly on HVCB DC ckt is used for their protection
ckt (making/breakin) and indication ckt as well as for
auxilary ckt like antipumping/hunting ,PD,

Answer / murugavel

dc closing coil,spring chargingmotor,tripping coil, andi
pumpingcontactor

Answer / amit mathur

The closing coil and the tripping coil with dc to dc
convertor for appropriate operation.

Answer / arunmozhi

circuit breaker in closing coil and tripping coil worked
for DC voltage.spring charge only used for 220v AC voltage.

Answer / sunita

in circuit bkr. only closeing and triping coil is a DC
component spring chargeing motor is generally AC motor

Answer / nilkanth

In circuit brekar motor used for spring charging is DC
motor 110v DC.

what is the functioning of cvt in a substation?

2 Answers  

why in transformers voltage given is in the multiple of 11

3 Answers  

Is it acceptable of installing an earth pit in planters area where bare copper cable, earth rod and connection are susceptible to corrosion due to water?

0 Answers  

Why inductors are installed in electrical circuits?

0 Answers  

What are the roles and responsibilities of electrical engineer in cement plant

0 Answers  

kVA rating of open delta connected transformer is _____% kVA rating of delta/delta connection A 50 B 70.7 C 57.7 D 75.7

2 Answers  

What do you mean by cogeneration? What its working principle?

0 Answers  

Describe the control mechanism of missile launcher???

0 Answers   DRDO, ONGC,

What happens to the synchronous generator when reverse power is given to it?

1 Answers  

when current lags behind voltage how does it affect the circuit.In other words what is the significance of lagging current?

3 Answers  

How to check the specific gravity of the two 12 V batteries connected in series to a 24 V UPS and inverter ? will we have to disconnect all the connections and turn off the UPS and inverter or not ? will we have to check specific gravities in each cell of the two batteries ? what is the name of the instrument that is used to check the specific gravity and whats the procedure to check the specific gravity with it ? thanks

2 Answers  

For an 100kw generator, only 50kw of load is connected. will the generator generate only 50kw or 100kw. if it generate 100kw what happens to rest of the 50kw. what happens if we connect more than 100kw of load?

8 Answers