Answer / vipul kumar

lightning arrester is a device which is used to protect the
equipment against flashing of light or overvoltage by
providing low impedance path for current to ground.

Answer / pyobik

Lightning Arresters or Surge Arresters are always connected
in Shunt to the equipment to be protected, they provide a
low impedance path for the surge current to the ground.

Wave trap is a parallel tuned inductor - capacitor 'tank'
circuit made to be resonant at the desired communication
frequency.
It is the effort to utilize the same transmission line
between two substation for the purpose of communications.
At this communication frequencies the tank ckt provides
high impedance and does not allow to pass through them &
onto the substation bus & into transformers.

Answer / sivasamy83

Wave Trap,

This is varying the impedance...

The Application is PLCC(power line career communication)

Linghtining Arrester:

This is grounding the surge voltage.....

Answer / rakeesh

lighting arrerester s=are used to protect system from the
over voltages like flashs occered themn its act like low
impedance to ground

Answer / smita

LIGHNING ARRESTER IS THE NON LINEAR RESITANC (ZINK OXIDE)
WHICH GVES LOW RESISTENCE PATH TO HIGH VOLTAGE AND HIGH
RESISTENCE TO LOW VOLTAGE,IT IS CONNECTED IN SHUNT WITH
EUIPMENT.

Answer / thuranga

Lightening Arrester is connected in shunt with the lines so
that is protects from lightening.

when ever the lightening occurs, there is a voltage around
some thousands of voltage appear on line (3500V to 5000V)
for a fraction of seconds(25 to 30micro sec.s) which is more
than enough to damage all the equipment in the grid
connected to it. so when a lightening arrester is connected
then is provides low resistance path such that all that high
voltage is directed towards the earth resulting the
protection of all the equipments connected to the grid.

Answer / atul mishra

To protect human life and property, design engineers have to
install lightning protection systems on every GRID
SUB-STATION . The main function of the system is to capture
the lightning stroke, over voltage and then conduct
discharge current safely to the ground. Since there are 100
lightning discharges to the ground every throughout the
world, installing lightning protection systems are very
important for safety to human life and station

Answer / trilok kumar (engr-electrical)

Lighting arrestors are used to protect the system from the
lightining surges/high voltage surges.

wave trap is a device that can remove, filter out or
exclude noise and interference from a wave, usually a radio
wave.

It may also be called a Rejector-circuit for radio systems
It is an electronic filtering device designed to exclude
unwanted signals or interference from a receiver.

Answer / percy

wave trap dictinguishes b/w power freq waves and
carrier communication waves

Answer / jay prakash

a wawe trap is the device which trap the high frequency
signals to enter into substation.
As XL =2 Pi w f L as impedence is directly proprtional to
frequency thus provide high impedane for high frequency
(carrier frequency)& vice versa.

lightning arrester prevent the substation from lightning
impulse, under normal condion impedace of air gap is high
enough for the voltage i.e no discharge, in case of
lightning high voltage appears around air gap and cause a
discharge through air and go to ground and prevent from
fault

If 3-Ph motor of same rating connected in Delta & Star for same load one by one then which connection take more current in running (not in starting)for full load.(eg 8.5 KW,3-Ph 400 V)

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