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Home / Technical Articles / The essential HV/EHV substation auxiliary facilities you should know about

Substation auxiliary facilities

Nowadays, HV/EHV substations have become pretty complex from the design point of view. Besides the main electrical equipment, which must be designed and selected correctly, there are several auxiliary facilities without which a substation would not be able to operate correctly and safely. Auxiliary facilities such as earthing, cabling, oil handling system, lighting, fire fighting, crane and other unloading facilities, oil filtration, AC/DC auxiliary system, etc., must be provided.

Position of an AC auxiliary power supply transformer in the single line diagram of the substation
Position of an AC auxiliary power supply transformer in the single line diagram of the substation

These requirements have been briefly discussed in this technical article.

Table of contents:

  1. Earthing
  2. Cabling
  3. Oil-handling system
  4. Illumination system
  5. Crane facilities
  6. Fire protection facilities
  7. DC auxiliary supply
  8. AC auxiliary supply
  9. Ventilation

1. Earthing

Provision of adequate earthing system in a substation is extremely important for safety of the operating personnel as well as for proper system operation and performance of the protection devices.

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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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