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Date：05-08-2026
Indoor high-voltage AC earthing switches serve as core safety auxiliary equipment for 40.5kV indoor power systems. They are mainly used to provide reliable earthing protection during the maintenance of high-voltage equipment, and also deliver protective functions in the event of system faults. Their core application scenarios are categorized as follows:
This is the most core and common application scenario of the product. In indoor high-voltage power distribution sites such as substations and distribution rooms, when 40.5kV high-voltage equipment (including transformers, circuit breakers, busbars, power cables, etc.) requires inspection, maintenance or replacement, the equipment must be powered off first. Afterwards, the earthing switch is closed to establish a reliable connection between the equipment and the ground, so as to release residual charges (such as capacitive current) on the line.It prevents electric shock casualties to maintenance personnel caused by accidental power reclosure and protects the insulation of equipment from damage. Strictly following the safety operation procedure of power cut – electrical testing – earthing connection, it creates a safe working environment for maintenance operations and acts as an indispensable safety guarantee device in power maintenance work.
This earthing switch can be used as a supporting component for 40.5kV indoor high-voltage switchgears, matching with mid-mounted switchgears such as KYN61-40.5 and ring main units to realize the integrated functions of service – isolation – earthing.During the operation of switchgears, the earthing switch can work in coordination with disconnectors. Mechanical and electrical interlocks are adopted to ensure the correct operation sequence and prevent misoperation. Meanwhile, it provides earthing protection during switchgear maintenance, simplifies the switchgear structure, and saves installation space and costs. It is widely applied in various complete sets of indoor high-voltage power distribution equipment, improving the safety performance and operation & maintenance convenience of complete equipment.
It is applicable to 40.5kV indoor high-voltage power distribution systems in large factories, industrial parks, metallurgy, chemical engineering and other industrial sites. It provides maintenance earthing protection for high-voltage equipment in workshops, production lines, substations and other areas, ensuring the safe and stable operation of power systems during industrial production, and avoiding production schedule disruptions caused by electrical faults. Meanwhile, it adapts to complex working conditions in industrial environments with excellent reliability and durability.
It is suitable for indoor high-voltage distribution rooms in high-rise buildings, commercial centers, residential communities and large public facilities (such as hospitals, schools and shopping malls). It provides safe power guarantee for residential life, commercial operation and public services, and plays a critical earthing protection role during the maintenance of high-voltage equipment to ensure the safety of personnel and equipment. It meets the installation space and application requirements of civil sites, featuring low operation noise and convenient maintenance.
Optimized in design, the product can adapt to special operating conditions upon demand. It can be applied to special environments such as high-altitude areas and coastal salt-fog regions (equipped with air pressure compensation modules, anti-corrosion coatings and other accessories). It is also suitable for fields with stringent equipment performance requirements including nuclear power, wind power and offshore oil & gas platforms.With relevant special certifications, it meets the safe operation requirements of various special scenarios and provides reliable earthing protection solutions for complex high-voltage power systems. Its short-circuit making capacity and insulation performance are well adapted to the application requirements under various complex working conditions.
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