2026/07/28
Zhejiang Jingyu Technology Co., Ltd. (JYDQ), a leading Chinese manufacturer of medium and high-voltage power equipment, is proud to announce the successful commissioning of a complete 110kV distribution station project for a valued client in West Asia. The project, which reached its key milestone on June 13, 2025, encompasses the supply, installation supervision, and on-site commissioning of SF₆ gas-insulated circuit breakers, instrument transformers, and high-voltage disconnect switches — all designed and manufactured at JYDQ's state-of-the-art facility in Zhejiang, China.
The distribution station serves as a critical node in the regional power transmission network, delivering reliable 110kV switching, metering, and protection capabilities for urban and industrial loads.
JYDQ's experienced engineering team worked closely with the local EPC contractor throughout the installation phase, providing on-site technical guidance for equipment positioning, foundation alignment, interconnections, and pre-commissioning tests. The outdoor switchyard features JYDQ's 110kV SF₆ live-tank circuit breakers mounted on reinforced concrete support structures, flanked by high-accuracy instrument transformers and robust disconnect switches — all designed to withstand the region's demanding climatic conditions including high ambient temperatures and dust exposure.
Despite challenging logistics and a tight project timeline, all primary equipment passed the rigorous site acceptance tests (SAT), including power-frequency withstand voltage tests, circuit-breaker timing tests, and insulation resistance measurements, with all parameters well within IEC and client specifications.
At the heart of the distribution station are JYDQ's 110kV SF₆ gas-insulated circuit breakers — the LW series, designed and type-tested in accordance with IEC 62271-100. These breakers feature a live-tank design with sulfur hexafluoride (SF₆) as the arc-quenching and insulating medium, ensuring superior interrupting performance with a rated short-circuit breaking current of up to 40 kA. The breakers are equipped with spring-operated mechanisms offering reliable operation over 10,000 mechanical cycles (M2 class), minimal maintenance requirements, and an annual gas leakage rate of less than 0.5%.
Each breaker underwent extensive routine testing at JYDQ's in-house high-voltage laboratory before shipment, including power-frequency and lightning-impulse withstand voltage tests, main-circuit resistance measurement, and mechanical endurance verification.
Complementing the circuit breakers, JYDQ supplied a complete set of 110kV instrument transformers — including current transformers (CTs) and voltage transformers (VTs) manufactured in compliance with IEC 61869 standards. These oil-immersed and SF₆-insulated units provide accurate measurement and protection signals to the distribution station's control and relay systems, with accuracy classes of 0.2/0.5 for metering cores and 5P/10P for protection cores.
Each transformer features high-creepage-distance insulators specifically selected for the region's environmental conditions, ensuring reliable performance under pollution and humidity stress. Factory acceptance tests confirmed insulation integrity, ratio accuracy, and thermal stability across the full rated current range.
JYDQ's GW4 and GW5 series outdoor high-voltage disconnect switches provide the critical visible-isolation function for safe maintenance operations within the distribution station. These horizontally and vertically mounted three-phase gang-operated switches are rated for 110kV operation with a rated current of up to 2,000A and peak withstand current of 80kA. The switches feature hot-dip galvanized steel structures for long-term corrosion resistance and self-cleaning porcelain or composite insulators for reliable performance in dusty environments.
The disconnect switches are equipped with both manual and motorized operating mechanisms, enabling both local and remote control integration with the distribution station's SCADA system. All switches underwent mechanical endurance testing exceeding 2,000 operations before delivery.
Zhejiang Jingyu Technology Co., Ltd. (brand: JYDQ) is a premier manufacturer and exporter of medium and high-voltage electrical equipment based in Zhejiang, China. With over two decades of industry expertise, JYDQ supplies a comprehensive product portfolio — including power transformers (oil-immersed and dry-type), SF₆ and vacuum circuit breakers, ring main units (RMU), instrument transformers (CT/VT), disconnect switches, switchgear panels, and prefabricated distribution stations — to over 80 countries worldwide.
All JYDQ products are designed and manufactured to international standards (IEC, GB) and carry CE certification. Our ISO-grade factory is equipped with advanced CNC machinery, high-voltage testing laboratories, and a dedicated R&D team committed to continuous product innovation. From 12kV to 252kV, JYDQ delivers end-to-end solutions for power generation, transmission, and distribution networks.
We are committed to meeting the specific needs of different markets through rigorous quality control and customized services. JYDQ not only provides high-performance electrical equipment, but also focuses on building long-term partnerships with customers to ensure efficient and smooth project execution from design to delivery. With our superior technical capabilities and reliable after-sales service, we contribute to the modernization and upgrading of global power infrastructure, safeguarding the safety and stability of energy transmission. Choosing JYDQ means choosing a professional, reliable, and sustainable future.
We provide innovative product and design solutions specifically tailored to medium- and high-voltage equipment. All internal mechanisms and components are developed in-house by our own R&D team -adedicated technical team of more than 10 professionals ensuring complete control over design, quality, and customization.
Every product is backed by a minimum 10-year warranty, ensuring long-term reliability and total peace of mind.
Rigorously selected high-grade materials ensure superior durability and refined manufacturing - crafted withpure copper and premium alloy silicon steel for long -lasting performance and exceptional workmanship.
Efficient logistics and inventory management to streamline your supply chain - powered by ourpartnerships with professional logistics teams and a wide range of shipping options for faster, more convenient delivery.
Comprehensive quality assurance and product testing for reliable performance. Every productundergoes multiple rounds of inspection - from raw material and component checks tomechanism testing, finished-product testing, and a final pre-shipment test before delivery.
One-stop ODM services with 20 years of experience - we design and manufacture custom.
hardware and industrial components to your specifications, in-house and ready for your own brand. From color to design, every detail is fully customizable to meet your needs.
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