Answer / logan

An electrical substation is a subsidiary station of an
electricity generation, transmission and distribution
system where voltage is transformed from high to low or the
reverse using transformers.

construction is explained in the books of john D Mc Donald.

Answer / g venkateshwarlu

The use of a an Electrical substation is either to step
up / stepdown the voltage of the transmission line to suit
the voltage level to be distributed either directly or
indirectly to the consumers. Normally, voltage will be
stepped down for the distribution purpose.

Transmission voltage is 400 KV in India. It will be stepped
down to 400 KV / 220 KV / 132 KV / 33 KV / 11 KV or 415V
level to suit to the requred level.

Answer / stalinborn

substation is used to change voltage level whether it is
step up or step down using transformer.The secondary of
transformer will feed to many feeders.for measurement and
protection of devices in substation there will be CT and PT.

Answer / abhidewas

substation are the place where u perform the following operation..

1) compensation of reactive power.
2) change the magnitude of voltage.

Answer / ch.narender

Conventional current is the reverse current conventional current is again connected to the main input supply through substation(please answer to its correct or not)

Answer / natesan

1. Load demand ( I think u know )
2. Reduce the voltage drop ( Government get profit )

Define the overload capacity of the motor.

3 Answers   Alstom, Maynilad,

What is the meaning of floating point earthing in battery backed systems ?

0 Answers  

For the requirement of a furnace of temperature range up to 1200 oC using silicon carbide rods, What is the required rate of transformer needed (please do it with all details)?

0 Answers   Intel,

can we synchronize star system generators with delta system generators?

0 Answers  

What are the causes for the failures of sandwich type (Al) busducts?

0 Answers  

Why the standard of ambient teperature mentioned as 40 degree celcius in machines.

0 Answers  

can we use inductor in case of d.c.,if yes then what will happen in circuit

3 Answers   JSW,

what type of oil is used in transformers? a)conduting b) insulating

25 Answers   ABB, LGS,

One of our gas turbine generator unit "1st stage rotor ground fault" alarm was occured several times. we tried to measure some voltage vulue ground fault protection relay (UNS3020a made by ABB and we measured the value of: Ground: 0.9VDC 5V: 5.8VDC 24V: 23VDC u+: 300 – 350mVAC Rf1: 17.5mVAC Rf2: 17.6mVAC The unit still running and the alarm was reset. As of 6pm yesterday and unitl now no alarm happened again. I our protection relay was defective?

1 Answers  

hi pal, i am vengatesh from tamilnadu(chidambaram),i have called for the written test for the post of jr executive(ELECTRICAL) of AAI ,I dont know about the question paper pattern,so any kindly help me to face the examination,post me the model question papers and some tips to write my examination to (vengi.annadurai@gmail.com)

0 Answers  

What is the mulplying factor of trivector meter (11kv) having ct ratio 100/5 amp.

2 Answers  

how to set time from star to delta starter

2 Answers