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

state types of reflectors in illumination engg. ???????

0 Answers  

---

how to calculate compresor capacity?

0 Answers  

---

How to calculate the rating of ELCB OR RCCB for an equipment?

2 Answers  

---

how can we test the polarity of a 3-phase transformer?

2 Answers  

---

what is the mechanism of operation of brushless dc motor why is it more wexpensive then ordinary permanent magnet motors

0 Answers   Lanco,

---

---

what happen if the secondry winding of the transformer is having less no of turns compare to the primery winding.

2 Answers  

---

percetans

0 Answers   Bhel,

---

what are the sections in a high voltage system(eg:incomer,buscoupler,isolator

1 Answers   IGL, L&T,

---

critically criticize the application of ring main unit in power system

0 Answers  

---

cleat wiring system is used at

2 Answers  

---

How to take of Transformer oil Break down voltage test?

2 Answers  

---

Can u explain : how capacitor act when the supply is given is a.c and d.c. I know that when d.c supply is given then the capacitor charges and becomes open circuited. But please say about when a.c is given. I have seen that when a.c supply is given ,it charges and discharges, But when we plug in capacitor to our daily supply and take it out ,then we join those wires spark will appear,which seems charge is present ,but when a.c is given it should charge and discharge

3 Answers  

---