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Classification of general high voltage load break switches

What is a High Voltage Load Break Switch?

A High Voltage Load Break Switch (HV LBS) is an electrical device that operates between a high voltage circuit breaker and a high voltage disconnecting switch. It is often used in conjunction with a high voltage fuse to control power transformers. Equipped with a basic arc extinguishing mechanism, the HV LBS can switch certain load currents and overload currents but is unable to interrupt short-circuit currents. For this reason, it is typically paired with a high voltage fuse for short-circuit protection.

Classification of General High Voltage Load Break Switches

  1. El-Level Universal Load Switch
    Designed for normal power distribution systems that require continuous power feeding and do not involve frequent switching operations.

  2. E2-Level Universal Load Switch
    Requires minimal maintenance over its service life, with no need for an overhaul of the main circuit-breaking components.

  3. E3-Level General-Purpose Load Switch
    Capable of handling frequent switching of large currents and closing short-circuit currents at higher frequencies.

  4. M1-Class Universal Load Switch
    Features a mechanical lifespan of 100 operational cycles.

  5. M2-Class Universal Load Switch
    Designed for special applications, offering an extended mechanical lifespan of 500 operational cycles.

Breaking and Closing Capabilities of Load Switches (Rated Voltage ≤ 40.5 kV)

  1. Rated Active Load Breaking Current: Equal to the rated current.
  2. Rated No-Load Transformer Breaking Current: Equal to 1% of the rated current.
  3. Rated Distribution Line Closed-Loop Breaking Current: Equal to the rated current.
  4. Rated Cable and Line Charging Breaking Currents: Refer to the applicable standards (see table for details).
  5. Rated Short-Circuit Making Current: Equal to the rated peak withstand current.

Typical Models and Voltage Ranges

Examples of load break switches include FN7-12, FN5-12, FN7-24, FN5-24, FKN12, FN18, and others. These are suitable for systems with rated voltages of 12 kV, 24 kV, and 36 kV.