Draw a neat labeled diagram to show protective system for AC traction and give the function of each relay used in it. 
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Protective system for AC traction: 

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Function Of Each Relay: For transformer

• Inverse time over current relay– as back up protection on primary (HV side) over current protection of transformer and other equipment. 

• Overload thermal relay – protection against sustained overloads on t/f 

• Earth fault relay – earth fault protection of transformer 

• Buchholz relay – Protection from incipient earth or inter winding faults inside the transformer 


For catenary

• MHO relay – wrong coupling protection 

• MHO relay – over current protection at farthest point. 

• over current relay - over current protection against faults near substation 

• Under voltage relay – protection against faults far away from substation

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