Switchgears: Types, Design Features

[vensorelectricals]

A switchgear is an electrical installation that serves to receive and distribute electricity and contains switching devices, busbars and connecting buses, auxiliary devices (compressor, battery, etc.), as well as protection devices, automation and measuring instruments.

 

Switchgears of electrical installations are designed to receive and distribute electricity of the same voltage for further transmission to consumers, as well as to supply equipment within the electrical installation.

 

If all or the main equipment of the switchgear is located in the open air., It is called open (switchgear): when it is located in a building - closed (switchgear). A switchgear consisting of fully or partially closed cabinets and blocks with built-in devices, protection and automation devices, supplied assembled or fully prepared for assembly, is called complete and is designated for indoor installation of switchgear, for outdoor - KRUN.

 

Power center - a generator voltage switchgear or a secondary voltage switchgear of a step-down substation to which the distribution networks of a given area are connected.

 

Switchgears (RU) are classified according to several criteria, below we give their types and design features.

 

Switchgears up to 1000 V

 

Switchgears up to 1000 V are usually installed indoors in special cabinets (boards). Depending on the purpose, 220/380 V switchgears (voltage class 0.4 kV) can be made to power consumers or exclusively for the own needs of the electrical installation.

 

Structurally, 0.4 kV switchgears have protective devices (circuit breakers, fuses), circuit breakers, switch-disconnectors and connecting busbars, as well as terminal blocks for connecting consumer cable lines.