SH Power new generation of high and low-voltage switchgear has already met the technical requirements for nuclear power

1. Technical Requirements for High-Voltage Switchgear

• The cabinet must have sufficient mechanical strength to ensure that operations on the primary side do not cause malfunctions on the secondary side.
• The cabinet design should prevent the spread of accidents and support safe maintenance of secondary equipment without de-energizing the primary side.
• Mechanical or electrical interlocking devices should be equipped to ensure correct operating procedures, such as preventing the operation of isolating switches after the circuit breaker is closed.

• Prevent accidental opening or closing of circuit breakers.
• Prevent opening or closing of isolating switches under load.
• Prevent grounding of live circuits.
• Prevent closing of circuit breakers with grounding lines in place.
• Prevent accidental entry into live compartments.
• Mechanical locking should be preferred, with an emergency unlocking mechanism provided.

• The insulation strength of primary and secondary circuits must pass a 1-minute power frequency withstand voltage test without breakdown or flashover.
• The rated insulation level must meet the requirements for power frequency withstand voltage and impulse withstand voltage.

• The draw-out unit must have working, testing, and maintenance positions, and units of the same model should be interchangeable.
• A reliable earthing device must be provided between the draw-out unit and the cabinet.

• Adaptability to high altitude (up to 2000 meters), high humidity (daily average relative humidity ≤95%), and extreme temperatures (-40°C to +40°C).
• In special environments (such as high humidity or high altitude), auxiliary measures such as heaters should be provided.

2. Technical Requirements for Low-Voltage Switchgear

• Low-voltage switchgear must pass seismic tests to ensure good electrical continuity of auxiliary and control circuits under rated voltage, with no faults in equipment or components after testing.

• Probes should have sensitive sensing capabilities to reflect the internal partial discharge status of the equipment.
• The device should have self-calibration functions and support data recording (capable of storing at least one week of data).

• The enclosure protection level should reach IP30 or above, with locked cabinet doors to ensure the safety of operating personnel.
• The cabinet structure should be designed for ease of operation, maintenance, and testing.

• Some low-voltage switchgear should be equipped with intelligent monitoring functions, such as overheating alarms and voice anti-misoperation prompts.

3. Special Requirements for Nuclear Power

• High and low-voltage switchgear must meet the special technical requirements of nuclear power plants, including equipment service life, technical content, and manufacturing quality.
• In the nuclear island section, low-voltage switchgear must meet seismic test requirements to ensure normal operation under extreme conditions such as earthquakes.

• Design optimization should be based on practical experience in nuclear power projects, targeting common technical issues.
• Quality control during the manufacturing process must be strict to ensure compliance with the high standards of nuclear power projects.

4. Future Development Trends

• Support for IoT technology to enable remote monitoring and fault diagnosis.
• Further enhancement of seismic performance and environmental adaptability to meet the stringent requirements of nuclear power plants.