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UNIT 2
WHAT ENGINEERS SHOULD KNOW
ABOUT USING CONDUITS IN POWER
SUBSTATION DESIGNS

1 Learn the meaning of the following words, word-
combinations and word groups:
Conduit, power substation design, breakers, transformers,
instrument transformers, motor-operated disconnect switches,
protection, medium-voltage circuits, corrosion resistant,
maintaining systems, rigid metal conduit, electrical metallic
tubing,
fiber optic cables, medium voltage circuits, installation,
maintenance, underground electric supply, communication lines.

2 Read and translate Text 1:
Text 1
Design Challenges
There are several locations where conduit is used in power
substation designs. The most common one considered is conduit
used to provide cable access to equipment, such as breakers,
transformers, instrument transformers, and motor-operated
disconnect switches located in the yard of the substation.
Conduit can be a means by which direct buried cable gets from
the ground to the equipment, or it can be run directly to cable
trenches, manholes, or to the electrical equipment enclosure.
Conduit is also used to run the wiring within the electrical
equipment enclosure.
Utilization wiring would include alternating current (AC)
power cable used for lighting receptacles and High Voltage
Alternating Current (HVAC). These uses of conduit are in all
substations and have a straightforward application of the National
Electrical Code (NEC).
Another application of conduit in the substation is for the
protection of medium-voltage circuits. Examples of these circuits
include distribution cable leaving the substation and wind farm
collector circuits entering the substation. This application of
conduits results in some design challenges when applying the
NEC.

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