Understanding Gang Operating Devices in Substation Equipment

As a leading food industry consultant, PMG Engineering provides essential technical services, including factory assessments, to support the food processing plant construction process. In the course of designing and building food factories, understanding electrical components such as Gang Operating Devices is critical. In this article, we delve into their functioning, components, and applications.

What is a Gang Operating Device?

A Gang Operating Device, a vital component of substation equipment, is primarily used for power transfer control. These devices:

• Control power transfer based on load demands.
• Isolate faulty circuits.
• Prevent system stability failures by maintaining permissible parameters.
• Facilitate maintenance of substation equipment.

The components of a Gang Operating Device include:

• Lightning Arrester
• Air-break switch
• Drop out fuse (DO)
• Earthings

Working Principle

Gang operated Switches or G.O Switches are predominantly used in overhead power lines. They operate in a group of three switches, utilizing a single mechanical operation, hence the term 'Gang Operated'. Known also as air-break switches or God switches, they utilize air as the breaking medium. These switches lack load-breaking capabilities and should only be operated when the transformer is on no-load, ensuring a safe operation.

Air-break Switch

An Air-Break Switch (ABS) is pivotal within distribution networks, serving both isolation and switching functions. These switches use air as the dielectric, with special arcing horns to quench arcs during current interruption. Typically installed outdoors, they can be operated through various mechanisms, including:

• Manually via a handle or ratchet mechanism.
• Using an insulated 'hook stick'.

Types of Air-break Switches include:

• Single pole Air-break switch
• Gang operated Air-break switch

Earthing Switches

Ensuring safety during MV switchgear maintenance, earthing switches discharge voltage safely into the ground, reducing risks for maintenance personnel. These switches are strategically positioned on transmission lines and bus-bar sections to maximize safety and operational efficiency.

Drop Out Fuse

The dropout fuse is a key safety component, primarily protecting rural distribution network transformers. The fuse's visual indication through a hanging carrier post-blow enables quick fault detection and resolution. Specifications include a reference standard IS 9385/1983 and system voltage options of 12/24 kV, and 36 kV, with a rated current of 100/200 Amp.

Applications of Gang Operating Devices

Gang Operating Devices find substantial applications, including:

• Line Switching: For parallel, loop, load splitting, dropping, and associated charging currents.
• Transformer Switching: Handling load dropping and associated magnetizing currents.
• Cable Switching: Managing parallel or loop load, load dropping, and allied currents.

These devices offer impressive fault closing capabilities, ranging from 15 kA to 30 kA rms-asym.

Conclusion

Incorporating Gang Operating Devices into substation equipment enhances control, safety, and operational efficiency. As PMG Engineering, we provide strategic food business consultancy services, ensuring seamless integration of such technologies in food processing plant designs. Trust our expertise for a robust and technologically advanced facility.