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Structure of LV electrical power distribution
Structure of LV electrical power distribution

The requirements of electrical power distribution

The design of LV installations leads to basic protection devices being fitted for three types of faults:

  • Overloads
  • Short-circuits
  • Insulation faults

Safety and availability of energy

Implementation of these protection devices must allow for:

  • The statutory aspects, particularly relating to safety of people
  • Technical and economic requirements.

The chosen switchgear must:

  • Withstand and eliminate faults at optimised cost with respect to the necessary performance
  • Limit the effect of a fault to the smallest part possible of the installation in order to ensure continuity of supply.

Achievement of these objectives requires coordination of protection device performance, necessary for:

  • Managing safety and increasing durability of the installation by limiting stresses
  • Managing availability by eliminating the fault by means of the circuit-breaker immediately upstream.

The circuit-breaker coordination means are:

  1. Cascading
  2. Discrimination.

If the insulation fault is specifically dealt with by earth leakage protection devices, discrimination of the residual current devices (RCDs) must also be guaranteed.


AUTHOR: Schneider Electric experts

Title: Schneider Electric Low voltage expert guides no. 5 – Coordination of LV protection devices
Format: PDF
Size: 3.07 MB
Pages: 44
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Coordination of LV Protection Devices

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