Interview Questions.

Question 1. What Do You Mean By Zone Of Protection?

Answer :

The protection is organized to provide a hoop of safety round every and each detail of energy device. If there is any fault associated in the ring the relays associated with it need to journey all the allied circuit breakers if you want to take away any defective element from relaxation of the strength device. This ring of protection is known as ‘Zone of protection’.

Question 2. What Are Internal And External Faults?

Answer :

Faults that arise inside the zone are termed as Internal Faults and that arise outdoor the quarter of protection are termed as external faults (also can be referred to as as through faults).

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Question 3. What Do You Mean By Reach And Reach Point Of The Relay?

Answer :

The farthest point from the relay which is still inside the area of protection is known as attain point and the gap among relay and reach factor is referred to as attain.

Question four. Why Does The Adjacent Zones Of Protection Overlap?

Answer :

If the adjoining zones do not overlap there may be some part of the electricity device that is disregarded unprotected.

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Question five. How Do You Select The Pickup Value Of A Relay?

Answer :

The relay should allow ordinary load as well as a positive degree of overload to be supplied. So the pickup price of the relay must be extra than maximum load. At the identical time, the relay must be touchy sufficient to reply to the smallest fault. So, pickup price should be less than the smallest fault contemporary.

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Question 6. How To Set The Operating Time Of The Relay?

Answer :

Naturally while a fault takes place it's miles sensed by each the number one and backup safety. As the running time of number one relay is much less than that of the backup relay, it will operate first. There may be an overshoot time (because of second of inertia of moving relay system).

Consider a primary relay A having operating time of 0.1 sec. Assume circuit breaker working time as zero.5 sec and overshoot time as 0.4 sec. Now the working time of backup relay B could be zero.1+zero.Five+0.4= 1 sec.

Question 7. Explain The Operating Principle Of Dtoc And Idmt Relays?

Answer :

A Definite time over present day relay (DTOC) may be adjusted to trip out at a particular amount of time, after it selections up. It has a time adjustment setting and pickup setting.

The running precept of IDMT relay is based at the idea that more intense a fault is, the faster it have to be cleared to avoid harm to equipment.

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Question 8. When Will You Go For Idmt And Dtoc Relays?

Answer :

Though IDMT relays provide sizeable improvement in fault clearing instances over DTOC relays, DTOC relays have their very own advantage.
Consider a device in which .
Since the fault cutting-edge as a function of fault vicinity is proportional to , it would stay extra or less consistent in the course of the duration of feeder. Therefore, the IDMT relay will now not be of much help. So DTOC relays can be used for traces which can be short in period.
Question nine. When Are The Directional Relays Used?

Answer :

Directional relays are used especially in unmarried cease fed system of parallel feeders, ring major feeder machine and many others.

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Question 10. What Is Difference Between Fuse And Breaker?

Answer :

Fuses are burned at the time of over modern-day flows within the circuit but breakers are simply open (no longer burn) on the time of over contemporary drift. Fuses are utilized in only one time however breakers are used by a couple of quantity of times.

Question eleven. What Is Different Between Resistance Grounding System And Resistance Earthing System?

Answer :

Resistance grounding system means connecting the impartial point of the weight to the floor to carry the residual modern in case of unbalanced situations via the neutral to the floor while resistance earthing device is done in an electric powered system so one can protect he system in occurrence of fault inside the device.

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Question 12. What Is The Power Station?

Answer :

Power Station is an area wherein Power is Generated and Transmitted , eg. Thermal strength station, Hydel electricity station, Nuclear electricity station and so on.

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Question thirteen. What Is Slack Bus ?

Answer :

Slack Bus is the chargeable for the delivering losses in the power gadget. On this bus the significance of voltage and phase perspective are distinctive. This bus is first to respond to a converting load circumstance.

Question 14. What Is Critical Disruptive Voltage?

Answer :

The minimum voltage at which the breakdown of the insulating properties of air occurs and corona begin is known as D C V .

Question 15. How Many Types Of Fault Occurs In The 3p Power System ?

Answer :

Faults within the three P system can be categorised underneath the following :-

unmarried line to floor (LG) fault
line to line (LL) fault
Double line to floor (LLG) fault 
Three Phase quick circuit (LLL) fault
Three segment to floor (LLLG) fault
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Question 16. How Many Methods Uses For The Load Flow Solution ?

Answer :

Gauss-seidel technique the use of Ybus
Newton- Raphson approach (NR)
Power go with the flow via line and slack bus strength
Decouple load float method
Fast Decouple load go with the flow approach.
Question 17. What Is Skin Effect ?

Answer :

When the AC exceeded through the conductor the density of the cutting-edge isn't uniform over the pass-segment of the conductor, the density of the current is very high close to the floor of the conductor and very low at center this effect is called skin impact. This effect is most effective within the ac.

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Question 18. What Is The Bundle Conductor And Why Is Used ?

Answer :

A bundle conductor includes two greater parallel subconductors at a spacing of several diameters.That is use to reduce the corona and skin impact.

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