Are interlocking and arc protection systems necessary for medium-voltage switchgear?

There are at least two safety requirements that medium-voltage switchgear MUST fulfil: an interlocking system and an arc protection system. Yes, these two systems are crucial in terms of safety because they protect not only the operator and other substation personnel but also the equipment in the substation itself.

What is a switchgear interlocking system?

Switchgear Interlocking Systems Interlocking between different switchgear apparatus and enclosure access covers and doors enhances personnel safety, as well as improving operational convenience. If a switching device can cause serious damage in an incorrect position, this must also have a locking facility. Interlocks consists of the rules.

How do position switches work?

The position switches with magnetic tumbler (-S1T to -S2T) interlock the remaining control cabinet doors electrically. The main switch is mechanically defeated using a tool at the handle of the door coupling rotary drive so that the door can be opened by specialist personnel when the main switch is switched on.

What is a metal-enclosed load interrupter switchgear?

The metal-enclosed load interrupter switchgear shall consist of deadfront, completely metal-enclosed vertical sections containing load interrupter switches and fuses (where shown) of the number, rating, and type noted on the drawings or specified herein.

How does a control panel door lock work?

The position switches with magnet locking device interlock the other control panel doors electrically. The main switch is mechanically defeated at the handle of the door-coupling rotary operating mechanism with a tool, so that the door can be opened by qualified personnel when the main switch is turned on.

What is a mechanical interlocking system?

It is usually achieved by mechanical-interlocking systems utilizing keys or, for distribution-voltage metal-clad switchgear, latches and bolts. Note that one school of thought terms the former as ‘key interlocking’ and the latter as ‘mechanical interlocking’. Contents: