Lec 9: Power system protection | Over current relays

Main topic🧡💚💙:Lec 9: Power system protection | Over current relays

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Welcome back to another lecture of power system protection. In this lecture we talk about the over current relays. For over current protection, we normally use Fuses, sectionalizer and reclosers, instantaneous over current relay, time relay, inverse time indefinite relay, directional relay, impedance relay, distance relay. pilot relay etc. we start from the simple over current device that is fuse and how fuse is working. in this section advantages and disadvantages of fuse is also explained. Further we moved the discussion towards the coordination of different relays. where we explained the minimum operating time of fuse and how sectionalizer and recloser works. Thermal relays are discussed very briefly. To learn more in depth, the time setting and plug setting values of over current relays are highlighted. Instantaneous OC relay
is an important part of power system protection which is explained in details. Definite time OC Relay
that act inverse at the beginning is also explained. Inverse definite minimum time OC relay
. the difficult part of our lecture was to understand the working of OC relay using Induction disk. in OC relay using Induction disk, we explained how torques are produced and what is damping torque.
The contents of this video are:
00:00 - power system protection
00:15 - Protective Devices.
00:56 - how Fuse
is working.
04:22 - Relay coordination with example

.
08:40 - what is Thermal Relays

.
10:04 - Over Current Relay
.
12:53 - Definite time OC Relay
.
14:21 - Inverse Time OC Relay
.
15:56 - Inverse definite min. time OC relay

.
20:22 - OC relay using Induction disk
.

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