You are currently browsing the tag archive for the ‘switchgear’ tag.

Advances in materials science, designing and in manufacturing process made medium voltage switchgear reliable, but insulation failures continue to happen, often resulting in equipment damage… (more)

Seemingly minor variations in design and specification can have significant impact on projects’ economics and space efficiency, posing the question whether to use switchgear or switchboards. The question often arises whether to apply switchgear or switchboards. It seems intuitive that switchgear should be larger, more expensive and more reliable than switchboards… (more)

Switchgear standards historically considered the electrical capability of switchgear with little regard to the effects of internal arc. To achieve some degree of safety users and manufacturers have considered measures ranging from PPE, specific operating procedures, through to remote control and arc detection systems, however these measures do not change the characteristics of the switchgear, and therefore the switchgear/switch room should still be considered a high risk area… (more)

IEC 61439 has eliminated the discrimination between type-tested assemblies (TTA) and PTTA by the Design Verification approach. The three main verification methods introduced in IEC 61439 are verification by testing; verification by calculation/measurement; and verification by design rules… (more)

Switchgear standards historically considered the electrical capability of switchgear with little regard to the effects of internal arc. To achieve some degree of safety users and manufacturers have considered, measures ranging from PPE, specific operating procedures, through to remote control and arc detection systems.  These measures do not change the characteristics of the switchgear, and therefore the switchgear/switch room should still be considered a high risk area… (more)

ABB’s well-known vacuum interrupter and the limiting and switching device, the (Is-limiter) , have been in service for decades. The technologies from these devices have been combined to form an arc-fault protection system for medium-voltage switch-gear that operates in the ultra-fast range. As a product, the extremely short switching time of this vacuum device combined with the rapid detection of fault currents and light intensity of a new dedicated electronic unit, will ensure all arcs are almost immediately extinguished… (more)

Customers served by modern electric utilities have come to expect highly reliable service due to increased awareness and to the sensitive devices utilised in today’s technologically advanced society. When the electric service is disrupted, even for a short period. The result can be anything from a minor inconvenience to a major economic loss… (more)

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