Protection Scheme

1 - Feeders Protection Schemes.
2 - Transformers Protection Schemes.
3 - Bus Bar Protection Schemes.
4 - Generators Protection Schemes.
 

Types and voltage level of Feeders

A – O. H. T. Lines

    500 KV O. H. T Line

•    400 KV O. H. T Line

•    275 KV O. H. T Line

•    220 KV O. H. T Line

•    132 KV O. H. T Line

•    66 KV O. H. T Line

•    33 KV O. H. T Line

•    22 KV O. H. T Line

•    11 KV O. H. T Line

B – U. G. Cables

•    275 KV U. G. Cable

•    220 KV U. G. Cable

•    132 KV U. G. Cable

•    66   KV U. G. Cable

•    33   KV U. G. Cable

•    11   KV U. G. Cable

500, 400, 275 and 220 KV O.H.T. Lines
Protection Schemes

      Main (A) Protection:
Distance Protection Permissive Over Reach Scheme. (POTT)

      Main (B) Protection:
Distance Protection Permissive Under Reach Scheme. (PUTT)

      Backup Protection:

  1. I.D.M.T Directional O/C & E/F Relay.

  2. Circuit Breaker Fail to Tripe.

  3. Inter Trip.

  4. SF6 Pressure Low Trip

  5. Cable Oil Pressure Low Trip (For Cable Tail )
    Drawing : single Line diagram for
    protection scheme Click Here

132 and 66 KV O.H.T. Lines
Protection Schemes

  • Main Protection:
    Distance Protection Permissive Under Reach Scheme. (PUTT)

  • Back up Protection:

  1. I.D.M.T Directional O/C & E/F Relay.

  2. Circuit Breaker Fail To Tripe.

  3. Inter Trip.

  4. SF6 Pressure Low Trip

  5. Cable Oil Pressure Low Trip (For Cable Tail)

      Drawing : single Line diagram for
          protection scheme Click Here

 

33 and 22 KV O.H.T. Lines
Protection Schemes

  •  I.D.M.T Direction O/C & EF Relay

  •  I.D.M.T Non Direction O/C & EF Relay

 

11 KV O.H.T. Lines
Protection Schemes


 •  I.D.M.T Direction O/C & EF Relay

 

275, 220 U.G.C. Line
Protection Scheme

     Main (A) Protection:
Differential Protection (Solkor – R)

     Main (B) Protection:
Distance Protection Permissive Over Reach Scheme. (POTT) With Carrier Signal through Pilot Cable

     Back up Protection:

  1.  I.D.M.T Directional O/C & E/F Relay.

  2. Circuit Breaker Fail to Tripe

  3. Inter Trip.

  4. SF6 Pressure Low Trip

  5. Cable Oil Pressure Low Trip

 132, and 66 KV U.G.C. Line
Protection Scheme

     Main Protection:
Differential Protection (Solkor – R)

     Back up Protection:

  1. I.D.M.T Directional O/C & E/F Relay.

  2. Circuit Breaker Fail to Tripe.

  3. Inter Trip (Through Pilot Cable).

  4. SF6 Pressure Low Trip

  5. Cable Oil Pressure Low Trip

33, 22 KV U.G.C. Line
Protection Scheme

     Main Protection:
Differential Protection (Solkor – R)

     Back up Protection:

     I.D.M.T Directional O/C & E/F Relay.

     I.D.M.T Non Directional O/C & E/F Relay.

     Cable Oil Pressure Low Trip. 

 

11 KV U.G.C. Line
Protection Scheme

     Main Protection:
Differential Protection (Solkor – R)

     Back up Protection:

     I.D.M.T Non Directional O/C & E/F Relay.

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