24KV Semi‑insulated Gas‑Insulated Switchgear (GIS)

TaiLi Electric 24kV semi-insulated switchgear (hereinafter referred to as "this switchgear") is a compact, SF₆-insulated metal-enclosed switchgear designed for 24kV medium-voltage power distribution systems. This switchgear is rated at 24kV, 630A, and 50/60Hz, and is

manufactured in strict compliance with GB and IEC standards. This switchgear is suitable for ring main units, secondary substations, industrial facilities, commercial buildings, and renewable energy projects.

Key Features

• Fully Sealed Stainless Steel Tank – TaiLi Electric 24kV semi-insulated switchgear incorporates a completely sealed stainless steel tank fabricated from 3–5mm thick stainless steel plates, welded by robotic welding machines to ensure minimal deformation and excellent gas-tightness. All live parts and switching devices of TaiLi Electric 24kV semi-insulated switchgear are enclosed within this tank, which is filled with SF₆ gas as both insulating and arc-quenching medium. This design ensures that TaiLi Electric 24kV semi-insulated switchgear remains unaffected by external environmental conditions such as humidity, dust, and contamination.
• High Protection Level – The sealed tank of TaiLi Electric 24kV semi-insulated switchgear achieves a protection rating of IP67, allowing this switchgear to operate reliably even under temporary water immersion conditions. The outer enclosure of TaiLi Electric 24kV semi-insulated switchgear is rated IP4X.
• Three-Position Load Break Switch – TaiLi Electric 24kV semi-insulated switchgear is equipped with a three-position load break switch (closed/open/earthed) welded inside the SF₆-filled stainless steel tank. The switch mechanism of TaiLi Electric 24kV semi-insulated switchgear features corrosion-resistant materials and self-lubricating bearings, ensuring low operating effort, high reliability, and extended service life.
• Modular and Extensible Design – TaiLi Electric 24kV semi-insulated switchgear adopts a modular unit configuration that allows flexible combination and expansion without the need for gas handling during assembly. TaiLi Electric 24kV semi-insulated switchgear is available in both fixed and extensible configurations, accommodating various substation requirements for compact switchgear solutions.
• Comprehensive Mechanical Interlocking – TaiLi Electric 24kV semi-insulated switchgear features a complete five-prevention mechanical interlocking system that prevents operational errors and ensures personnel safety.
• Smart-Ready – TaiLi Electric 24kV semi-insulated switchgear can be equipped with motorised mechanisms, voltage transformers, and distribution automation terminal units to enable remote monitoring and control capabilities.

Technical Specifications

Applications

TaiLi Electric 24kV semi-insulated switchgear is widely used across multiple sectors of the power industry:

• Ring Main Units – As a core component in 24kV ring networks for urban and rural power distribution.
• Secondary Substations – For compact, maintenance-free switchgear solutions in small to medium-sized substations.
• Industrial Facilities – Power distribution in factories, mines, and manufacturing plants.
• Commercial Buildings – For shopping centres, hospitals, sports venues, and high-rise buildings.
• Infrastructure – Airports,metro systems, railways, and tunnels.
• Renewable Energy – Wind farms and photovoltaic plants.
• Pad-Mounted and Underground Substations – Suitable for outdoor enclosures or semi-underground installations.

FAQ

Q1: What is the typical SF₆ gas leakage rate of this switchgear?

A: The SF₆ annual leakage rate of TaiLi Electric 24kV semi-insulated switchgear is ≤0.1%. The sealed tank is welded by robotic welding machines to ensure excellent gas-tightness, and the design guarantees no leakage for over 30 years.

Q2: What should I do if the SF₆ pressure drops or a gas leak is detected?

A: If the SF₆ density monitor indicates low pressure or an alarm is triggered, immediately stop operation, identify the leak source, repair the leak point, and refill the switchgear with SF₆ gas to the specified pressure. Regular inspections of the gas pressure gauge and density relay are recommended.

Q3: Does this switchgear require regular maintenance?

A: No. TaiLi Electric 24kV semi-insulated switchgear is designed as a maintenance-free product. The fully sealed stainless steel tank prevents contact between the insulating gas and the external environment, eliminating the need for periodic inspections, gas sampling, or regeneration throughout the product's service life.