17.1 Introduction

In this Chapter, a few important accessories of the Busduct, which form the majority of the metal-enclosed bus, are discussed. Many of them are also common to isolated phase bus.

The selection and sizing of the enclosure, conductor, and insulation system will define the performance criteria of a Busduct. The contribution of the accessories to deliver the performance after its installation is equally important. Seldom is any importance attached to the proper selection, sizing, and location of accessories in the Busduct. While some of the accessories can be standardized, others will depend upon the specifications and layout. The prominent accessories are:

17.2 Conductor Expansion Joints

There are different types of conductor expansion / flexible joints that are installed in a Busbar System. Each type has a specific function to perform and is therefore installed in a specific location. These are expected to compensate for: 

• • Variations in length due to thermal expansion/contraction.
  • Movement of the conductor during abnormal operating conditions such as short circuit.
  • Variation due to minor foundation settlement of connected equipment. Minor misalignment due to dimension tolerance

They also:

• Isolate and attenuate the vibration.
• Serve as a disconnecting link for equipment isolation.

17.2.1 Copper Laminates

Laminated Copper flexibles are the most reliable connections between the bus and the interfacing terminal of the equipment such as the generator, transformer, and switchgear. These are sturdy and can withstand much higher temperatures.