Protection Engineering Basics and Schemes Protection Engineering | Page 185
is producing. Both torques differences are actual torque of Generator. τ actual = τ mech − τ electrical
τ actual ∝ ∆w τ actual ∝ 1 ∆t
τ actual = jdw dt since for small variation τ actual ≅ P actual ThenP actual = P mechanical − P electrical
so P actual = P mechanical − P electrical = jdw dt since w = 2 ∗ pi ∗ f For any reason when frequency altered, actual power altered and vice versa
Simple conditions for Frequency relay operations:
5.7.1 under frequency Relay:
When load is greater than Generation, under frequency operated, to tackle this issue, frequency relay operates in stages to isolate the load on system; this phenomenon is called as load shedding.