Juhonkia’s 35kV Gas-Insulated Switchgear Successfully Commissioned in SGCC UHV Key Project – Datong–Tianjin South 1000kV Substation, Shanxi

Intelligent Manufacturing Empowers UHV Power Grids, Safeguarding Vital Power Transmission Corridors.

On August 12, 2026, the 35kV gas-insulated high-voltage switchgear independently developed and manufactured by Zhejiang Juhonkia Intelligent Electric Co., Ltd. (“Juhonkia”) smoothly passed system joint commissioning and live-line testing, and was officially put into commercial operation at the Datong–Tianjin South 1000kV Substation. This facility serves as a core hub of the Datong–Tianjin South 1000kV UHV AC Transmission Project, a key infrastructure initiative of State Grid Corporation of China (SGCC).

The milestone marks Juhonkia’s high-end intelligent power distribution equipment officially joining the primary supplier system for China’s national UHV backbone power grid. It demonstrates the robust capabilities of a domestic enterprise in the localization, intelligent upgrading and low-carbon development of critical power equipment.

Adopting fully sealed gas-insulated technology, the switchgear integrates high-precision digital sensors, edge computing modules and IEC 61850 intelligent communication interfaces. It features three core strengths: full-condition status monitoring, automatic fault diagnosis and coordinated remote operation & maintenance. Boasting a compact layout that cuts land occupation by 35%, the equipment operates reliably within an ambient temperature range of -40℃ to +55℃, fully meeting stringent requirements of UHV substations for superior reliability, high protection class and efficient maintenance.

Following delivery, the equipment underwent a 72-hour continuous live trial run, three extreme load surge tests and special acceptance inspection organized by SGCC North China Branch. All performance indicators achieved full compliance, earning high recognition from the joint expert panel of SGCC Shanxi Electric Power Company and China Electric Power Research Institute (CEPRI).

A senior representative of Juhonkia commented:“UHV power grids form the major arteries of the energy transition. Every reliably operating switchgear unit acts as an indispensable intelligent valve along these arteries.This successful commissioning is not a destination, but a new starting point. It validates Juhonkia’s technical philosophy — Define safety through intelligence, forge reliability with lean manufacturing. It also strengthens our commitment to continuous independent innovation of key equipment for the new power system.Moving forward, the company will accelerate the large-scale deployment of intelligent switchgear rated at 35kV and above across diversified scenarios, including large-scale desert, Gobi and steppe renewable energy bases, offshore wind farm booster stations and urban underground substations.”

Juhonkia has established a national-level R&D and industrialization platform covering the full value chain: design, manufacturing, testing and after-sales service. Its products have been deployed in landmark projects such as supporting substations for the Sichuan-Tibet Railway and the intelligent distribution network demonstration projects in the Guangdong-Hong Kong-Macao Greater Bay Area.The successful delivery of the Datong–Tianjin South Project provides strong momentum as the company advances through the review process for the national “Specialized, Refined, Differential and Innovative Little Giant” enterprise accreditation in 2026 and lays solid foundations for long-term development.

Unite Strengths for Long-term Vision; Ignite New Journey with Intelligence.

Guided by national strategic demands and focused on delivering tangible value to customers, Juhonkia strives to be a trusted Chinese partner for intelligent power equipment.