Question
Download Solution PDFA distance relay with inherent directional property is known as
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFA Mho relay or admittance relay measures a component of admittance |Y| ∠ θ. But its characteristic when plotted on the impedance diagram is a circle passing through the origin.
The relay is called Mho relay because its characteristic is a straight line, when plotted on an admittance diagram.
It is inherently a directional relay as it detects the fault only in the forward direction.
Important Points:
- Impedance relay is a voltage restrained overcurrent relay.
- Reactance relay is an overcurrent relay with directional restraint.
- Mho relay is a voltage restrained directional relay.
- Reactance relay is suitable for the protection of a short transmission line because its operation is independent of arc resistance.
- The relay which is selected for a long transmission line should be less affected due to power swings. Hence Mho relay is preferred.
- Impedance relay is suitable for medium transmission lines.
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