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High voltage internal switch

The high voltage in-house isolating switch (commonly referred to as a "knife disconnector") is a key electrical equipment in 10-35 kV switchgear. Its main function is to safely open or close a circuit in the presence of voltage and absence of...

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The high voltage in-house isolating switch (commonly referred to as a "knife disconnector") is a key electrical equipment in 10-35 kV switchgear. Its primary function is to safely open or close a circuit when voltage is present and no load is present, providing visible electrical isolation for the maintenance and testing of high-voltage circuit breakers, current transformers and other devices, a vital safety measure for maintenance personnel.

This product typically has a three-pole mechanical connection and consists of the main components: current-carrying blades, fixed contacts, base and high-strength porcelain insulators. Insulators provide reliable insulation support between live parts and the ground frame and guarantee mechanical stability during operation. The drive mechanisms are most often manual: by rotating the insulator or rod, the knives are driven to perform opening or closing operations, while position indicators clearly display the status.

High-voltage in-house isolating switches have high dynamic and thermal stability and can withstand short-term short-circuit currents. The design must take into account the mechanical interlocking, which provides logical interlocking with the circuit breaker and earthing switch, eliminating incorrect operations. Their robust design, reliable insulation, simple operation and safe, intuitive operation make these switches indispensable insulation devices in high-voltage power distribution systems in power plants, substations and industrial mining plants.

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