Single-interrupter circuit breakers require less than half of the SF6 used in a two-interrupter breaker and uses significantly less insulation material and parts as well as installation space. Aside from the obvious, a single interrupter breaker requires a less powerful drive, thus lighter structures and foundations. The breaker does not need grading capacitors which reduces the chances of the voltage transformers experience ferro-resonance oscillations which might damage the equipment.
High Voltage Products
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