Electrical Distribution System, Lecture notes of Power Distribution and Utilization

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01,02,03,04,05,06, BY VIDISHA 601; PARAS 602;ANKUSH603;DAKSH 604;AANCHAL 605 MEGHNA 606;SUKRIT 12604

Contents To Be Covered:

 Definition

 Classification Of Distribution System

 Distribution System Losses

FEEDERS DISTRIBUTORS SERVICE MAINS

Distribution

Feeder

 A Feeder is conductor which connects the substation to the area where power is to be distributed.  Feeder are used to feed the electrical power from the generating station to the substation  No tapings are taken from the feeder  So the current in it remains the same throughout  Main consideration in the design of feeder is the Current carrying capacity.

Service mains

 A service mains is a generally a small

cable which connects the distributer to

the consumer ‘s meter.

 The connecting links between the

distributor and the consumer terminals.

Introduction:

 Distribution system is a part of power system,

existing between distribution substations and

consumers.

 It is further classified on the basis of voltage

 Primary distribution system- 11 KV or 6.6 KV or 3.3 KV

 Secondary distribution system- 415 V or 230 V

Classification Of Distribution

System:

It can be classified under different considerations as;

1. Type Of Current:

a) AC Distribution System

b) DC Distribution System

2. Type Of Construction:

a) Overhead System

b) Underground System

Ac distribution

 A.c. distribution system is the electrical

system between the step-down substation

fed by the transmission system and the

consumers’ meters. The a.c. distribution

system is classified into

 ( i ) primary distribution system and

 ( ii ) secondary distribution system.

Primary distribution system  voltages somewhat higher than general utilisation and handles large blocks of electrical energy than the average low-voltage consumer uses.  Commonly used primary distribution voltage 11 KV, 6. 6 KV, 3. 3 KV.  Electric power from the generating station is transmitted at high voltage to the substation located in or near the city.  At this substation, voltage is stepped down to 11 kV with the help of step-down transformer.  Power is supplied to various substations for distribution or to big consumers at this voltage.  This forms the high voltage distribution or primary distribution.