2026/01/28
On January 26, 2026, Zhejiang Jingyu Technology Co., Ltd (JYDQ) successfully commissioned a comprehensive 110kV substation project for a valued client in Asia. The facility — located in a region where winter temperatures routinely drop below -30 degree C — serves as a critical node in the regional power grid, delivering reliable high-voltage switching, transformation, metering, and protection for both urban and industrial consumers.
The project encompassed the supply, installation supervision, and on-site commissioning of a full suite of primary high-voltage equipment — all engineered by JYDQ for uninterrupted cold-climate performance. The scope included 110kV SF6 gas-insulated circuit breakers, a vehicle-mounted prefabricated transformer cabin, high-accuracy instrument transformers, and high-voltage disconnect switches. Every unit was designed, manufactured, and routine-tested at JYDQ's ISO-certified facility in Wenzhou, China.
The defining challenge of this project was the harsh winter environment. With ambient temperatures frequently dropping below -30 degree C and heavy snowfall covering the site throughout the installation period, every piece of equipment was required to meet JYDQ's stringent cold-climate design specifications.
JYDQ's cold-climate engineering package includes: low-temperature SF6 gas density compensation with integrated heating blankets on circuit breaker tanks, synthetic ester and low-viscosity mineral oil options for transformers ensuring fluidity at -40 degree C, arctic-grade nitrile rubber gaskets and seals preventing embrittlement across all flange connections, and IP65-rated control cabinets with thermostatically-controlled anti-condensation heaters — each element validated through accelerated life testing at JYDQ's environmental simulation laboratory.
Despite heavy snow accumulation and frozen ground conditions, the JYDQ on-site commissioning team worked alongside the local EPC contractor to complete all foundation work, equipment positioning, inter-bay connections, and pre-commissioning tests on schedule. All primary equipment passed site acceptance tests (SAT) — including power-frequency withstand voltage, SF6 gas leakage rate, circuit-breaker timing, and insulation resistance — with all parameters conforming to IEC standards.
At the heart of the substation is JYDQ's 110kV live-tank SF6 gas-insulated circuit breaker — purpose-built for reliable arc interruption in the most demanding environments. The live-tank design, with sulfur hexafluoride (SF6) serving as both arc-quenching and insulating medium, delivers superior interrupting performance rated at 40 kA short-circuit breaking current with a mechanical endurance exceeding 10,000 operations (M2 class).
Each breaker is equipped with spring-operated mechanisms, CT-integrated protection, and SCADA-ready remote control interfaces. Key cold-climate enhancements include reinforced silicone-rubber composite bushings with extended creepage distance for anti-flashover performance under snow and ice conditions, and thermostatically-controlled tank heaters maintaining optimal SF₆ gas density across the full -40 degree C to +50 degree Coperating range.
A standout feature of this project was the deployment of JYDQ's vehicle-mounted prefabricated transformer cabin — a compact 110/10kV integrated solution combining high-voltage switchgear, transformer, and low-voltage distribution in a single transportable unit. Marked "Vehicle-Mounted Prefabricated Transformer Cabin" (车载变预制舱), this unit was fully assembled and tested at JYDQ's factory before shipment, dramatically reducing on-site installation time and complexity.
The cabin's structural design incorporates insulated sandwich panels, internal climate control, and vibration-dampened equipment mounting — ensuring stable operation despite ambient temperature swings from -40 degree C to +45 degree C. Prefabricated substations of this type are increasingly favored for remote and extreme-climate installations where traditional on-site construction is logistically challenging.
Complementing the primary breakers and transformers, JYDQ supplied a complete suite of support equipment manufactured to IEC 61869 and IEC 62271 standards: high-accuracy current and voltage instrument transformers for precision metering and protection relaying, and GW4/GW5 series outdoor high-voltage disconnect switches providing visible isolation gaps for safe maintenance operations.
All auxiliary equipment incorporates JYDQ's standard cold-climate package: hot-dip galvanized steel structures with minimum 85 micron zinc coating for multi-decade corrosion protection, silicone-rubber composite insulators resistant to thermal shock, and stainless-steel fasteners throughout to prevent galvanic corrosion in wet-freeze-thaw cycling conditions.
The site installation phase was executed under challenging winter conditions with ambient temperatures persistently below freezing. JYDQ's technical team provided full-cycle on-site support — from equipment positioning verification and foundation alignment checks to secondary wiring supervision and cold-weather pre-commissioning procedures. All testing protocols were adapted for low-temperature conditions, including extended equipment stabilization periods and ambient-corrected insulation resistance measurements.
Zhejiang Jingyu Technology Co., Ltd (Brand: JYDQ) is a premier manufacturer and EPC-capable service provider specializing in medium and high-voltage power transmission and distribution equipment. Headquartered in Wenzhou, Zhejiang — the "China Electrical Appliance Capital" — JYDQ delivers comprehensive solutions from 12kV to 252kV to over 80 countries worldwide.
All JYDQ products are designed, manufactured, and tested in full compliance with IEC, GB, and ANSI/IEEE international standards, and carry CE certification. Our ISO-certified factory features advanced CNC machinery, in-house high-voltage testing laboratories, an environmental simulation chamber for extreme-climate validation, and a dedicated 24/7 global technical support network.
CE Certified | IEC / GB / ANSI Compliant | 80+ Countries | 12kV-252kV Range | Extreme-Climate Proven | 24/7 Global Support
Website: www.jydqelectric.com | Email: [email protected] | Address: Liushi, Yueqing, Wenzhou, Zhejiang, China
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