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Power Terminology: Distribution System Network

Substation_Image

The Distribution System Network is a configuration of Power System Components operating at a set frequency with the sole aim of delivering usable power to end-users. AC Power is transmitted and distributed in Nigeria. Distribution System Networks is mainly divided into two parts namely:

  1. Primary Distribution (33/11/0.415KV)
  2. Secondary Distribution (11/415KV)

Household voltages are typically 415V or 240V

Distribution System Network Characteristics

  1. Distribution Network Voltage Level at 33KV, 11KV
  2. Distribution System Network Substations are step-down Substations
  3. Distribution Substation Construction (Indoor Substation, Outdoor Substation, Pole Mounted Substation, Compact Substation, Underground Substation)
  4. Transformer capacities are – 25KVA, 50KVA, 100KVA, 300KVA, 315KVA, 500KVA, 750KVA, 1000KVA

Distribution Substation Components

The components of the Distribution Substation can be categorised thus:

  1. Overhead Materials
  2. Underground Materials
  3. Substation Materials
  4. Distribution Transformer (This is the key component in the Distribution Substation. The Distribution Transformer basically transfers power between two circuits from one voltage level to another by mutual induction)

Earthing of Distribution Substation

Earthing of Distribution Substation is an important aspect of Distribution Transformers installation. It is standard practice that the neutral bushing of the Transformer and the body of the Transformer should be earthed by not less than two separate and distinct connections with a minimum of two different earth electrodes.