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A reactance relay is
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- voltage restrained directional relay
- directional restrained over-current relay
- voltage restrained over-current relay
- none of these
Correct Option: B
The torque equation for directional relay is,
T = KrI² – K3 VI cos (θ – τ)
here, K1 I² is operating torque proportional to square of current and K3 VI cos (θ – τ) provides restraining torque due to a curr ent voltage directional element.
