Metal-clad Switchgear 38kV switchgear

Metallic-clad and steel-enclosed switchgear represent two prevalent types of switchgear utilized in electrical power systems. While they share certain similarities, significant distinctions are also present. In this technical blog, we will explore the fundamental differences between steel-clad switchgear and steel-enclosed switchgear.

Steel-Clad Switchgear IEEE C37.20.2 Metal-Clad Switchgear

Steel-clad switchgear is a category of switchgear designed to provide a high level of safety for electrical energy systems. This type of switchgear is commonly employed in medium-voltage applications, typically ranging from 2.4 kV to 38 kV. Steel-clad switchgear is composed of distinct cubicles for the busbars, circuit breakers, and primary components, each enclosed within its own metal housing. The enclosures are interconnected via busbars, which are also contained within their respective metal enclosures.

The primary features of steel-clad switchgear are as follows:

Each compartment is entirely enclosed in a metal casing, which ensures protection against accidental contact with live components.

The circuit breaker is generally positioned in its own compartment, distant from the busbars.

IEEE C37.20.1

Metal-enclosed switchgear is a type of switchgear designed to offer a high degree of protection for electrical power systems. This kind of switchgear is typically utilized in low-voltage applications, usually at or above 1 kV. Steel-enclosed switchgear comprises a single metal enclosure that houses all components of the switchgear, including circuit breakers, busbars, and other essential elements.

The main features of metal-enclosed switchgear are as follows:

All components of the switchgear are contained within a single metal enclosure.

The circuit breaker is typically located within the same compartment as the busbars, with no separate booths for the busbars or individual components.

Differences Between Metal-Clad and Metal-Enclosed Switchgear

The primary differences between metal-clad switchgear and metal-enclosed switchgear are as follows:

Enclosure Configuration: Metal-clad switchgear features separate enclosures for each component, while metal-enclosed switchgear utilizes a single enclosure for all components.

Voltage Rating: Metal-clad switchgear is typically used in medium-voltage applications, whereas metal-enclosed switchgear is commonly employed in low-voltage settings.

Compartmentalization: Steel-clad switchgear is organized into cubicles to separate the circuit breaker from the busbars and additional components, while steel-enclosed switchgear contains all components within the same compartment.

Accessibility: Steel-enclosed switchgear provides easy access to all components, whereas metal-clad switchgear may require additional effort to access each individual component.

Space Requirements: Metal-clad switchgear necessitates additional space due to the separate cubicles, while steel-enclosed switchgear requires significantly less space.

In conclusion, metal-clad switchgear and metal-enclosed switchgear are two common types of switchgear employed in electrical power systems. While they share certain characteristics, they also have distinct differences relating to their enclosure configuration, voltage rating, compartmentalization, accessibility, and space requirements. Understanding the variations between these two types of switchgear can assist engineers in selecting the appropriate option for their specific applications.