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COTENELE explores how aging power infrastructure, with equipment over 30 years old, is driving the need for modern medium voltage solutions. The article covers challenges like rising maintenance costs, SF6 regulations, and grid changes, and presents how vacuum circuit breakers and SF6-free RMUs provide reliable, cost-effective upgrades for utilities, data centers, and industrial plants.

Medium voltage switchgear is a critical component in power distribution systems, serving as the control point between high voltage transmission networks and low voltage user equipment. This article covers how MV switchgear works, its four core functions—switching, fault protection, isolation, and measurement—and the different configurations used in substations, factories, data centers, and commercial buildings. It also explains vacuum circuit breakers, protection relays, and the industry trend toward SF₆-free switchgear. Cotenele provides a range of MV switchgear solutions, including KYN28 withdrawable switchgear, ring main units, and 24 kV SF₆-free RMUs.

Our KYN28‑12 switchgear, VS1‑12 vacuum breakers, LZZBJ9‑10 current transformers, and full substation packages are meant to work as one system — not as a pile of separate parts.

New energy, primarily wind and solar power, is reshaping the landscape of global power systems. Compared with traditional fossil fuels, new energy features renewable resources, zero-carbon operation, and wide distribution.

Power transformers are fundamental equipment in AC power systems for voltage conversion, energy transfer, and electrical isolation. Through electromagnetic induction, a transformer converts electrical energy from one voltage level to another at the same frequency, meeting requirements for generation step-up, long-distance transmission, regional distribution, and end-user utilization.

Medium-voltage switchgear plays an indispensable role in modern power infrastructure. Serving as the control node between power generation, transmission, and end-user consumption, this equipment is responsible for closing and opening normal load currents while automatically interrupting fault currents under short-circuit conditions, thereby protecting connected transformers, lines, and generators.