Short Notes: Power System Protection | Short Notes for Electrical Engineering - Electrical Engineering (EE) PDF Download

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Protection of Transmission line 
1) Mho relay is at least affected by power surges& thus it is used for protection of long 
transmission lines. It is inherently directional. 
2) Impedance relay is used for protection of medium transmission lines. 
3) Reactance relay is unaffected by ground resistance & hence used for earth fault 
protection & also for short transmission Lines. 
? These relays are collectively called as distance relays. 
Protection of Transformers 
? Differential relays are used for protection of large transformers and CT are always 
connected in configuration opposite to power transformer. 
Example: 1) If power transformer is Y ?? then CT is Y ?? 
               : 2) If power transformer is ? ? ? then CT is YY ? 
? Buccholz relay used to prevent any incipient fault below oil level in a transformer of small 
KVA. 
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