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Home / Technical Articles / Directional protection relays applied to multiple power sources, parallel circuits and loops

Directional protection

Directional protection is usually applied to distribution systems that contain multiple power sources, parallel circuits and rings/loops. For such systems it is absolutely necessary to have protection against fault currents that could circulate in both directions, avoiding disconnection of unnecessary circuits.

Directional protection relays applied to multiple power sources, parallel circuits and loops
Directional protection relays applied to multiple power sources, parallel circuits and loops

Contents:

  1. Busbar supplied by two parallel sources
  2. Directional Overcurrent Relays
    1. Definite time-current characteristics
      1. Definite-Current Protection
      2. Definite-Time Protection
    2. Inverse-Time Protection
      1. Very Inverse (VI) Oversurrent protection
      2. Extremely Inverse (EI) Overcurrent Relays
  3. Directional Relays Operation
    1. Example #1
    2. Example #2
  4. Directional Earth-Fault Protection

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Edvard Csanyi

Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV/MV switchgears and LV high power busbar trunking (<6300A) in power substations, commercial buildings and industry facilities. Professional in AutoCAD programming.

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