Answer / brandon

To compensate in the case a line has too much capacitive current, or the line has usually low charge. In the latter case, if the capacitive component is too great, the line experiences overvoltages which are harmful.

Answer / ankit

To avoid Ferranti Effect in case of lightly loaded line

Answer / umesh

Remove the Harmonics in the system.

Answer / sauvik biswas

With the fast expanding power system, the fault level (i.e. the power available to flow into a fault) is
also rising. The circuit breakers connected in the power system must be capable of dealing with
maximum possible short-circuit currents that can occur at their points of connection. Generally, the
reactance of the system under fault conditions is low and fault currents may rise to a dangerously high
value. If no steps are taken to limit the value of these short-circuit currents, not only will the duty
required of circuit breakers be excessively heavy, but also damage to lines and other equipment will
almost certainly occur.
In order to limit the short-circuit currents to a value which the circuit breakers can handle, additional
reactances known as reactors are connected in series with the system at suitable points. A
reactor is a coil of number of turns designed to have a large inductance as compared to its ohmic
resistance. The forces on the turns of these reactors under short-circuit conditions are considerable
and, therefore, the windings must be solidly braced. It may be added that due to very small resistance
of reactors, there is very little change in the efficiency of the system.
Advantages
(i) Reactors limit the flow of short-circuit current and thus protect the equipment from overheating
as well as from failure due to destructive mechanical forces.
(ii) Troubles are localised or isolated at the point where they originate without communicating
their disturbing effects to other parts of the power system. This increases the chances of
continuity of supply.
(iii) They permit the installation of circuit breakers of lower rating.

Answer / irfankh

to limit short ckt current, for that we use reactors
formula:
Ish=v/xL

How to find Cable size? Caterpillar generator produce (Two generators) 127*2=254 amp at 11 kv . What would be the cable size (XLPE) to supply 256 amp at 11 kv? Air or surrounding Temperature is 32 degree C. Cable will go under ground at 2.5 feet depth. Group Rating Factors is 3 cables. Clearance between cables is 7 cm. Soil Temperature (Ambient) 28o C Soil Thermal Resistivity is 1.2 K.m/W I would like to use 3 separate single core instead of using 3 core cable. Some says I should use three separate single core 120RM cables. Some says 70RM .some says 95. I m totally confused. Is there ant specific rule to determine cable size? What would be the LT cable size to flow 500 Amp current? Ifte My e mail address is ifte13@yahoo.com Anyone please send me the answer to my e mail address, i will be very glad.

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