HV Switchgear

HV switchgear is an integrated assembly of primary and secondary equipment for receiving, distributing, controlling, protecting, monitoring, and metering power in 3.6kV–40.5kV power systems. As the core hub of high-voltage power supply and distribution systems, it is typically installed in substations or user high-voltage distribution rooms, containing high-voltage circuit breakers, isolation switches, load switches, earthing switches, current and voltage transformers, surge arresters, protective relays, and measuring instruments. Modern designs adhere to strict safety standards-metal-enclosed construction, insulation medium (air, SF6 gas, or solid insulation) isolation, and five-prevention interlocking. It is classified by insulation and arc-extinguishing medium: Air-Insulated Switchgear (AIS, traditional and cost-effective), Gas-Insulated Switchgear (GIS, ultra-compact with SF6 gas-sealed stainless steel enclosure), and Solid-Insulated Switchgear (SIS, epoxy resin-encapsulated main circuits, no SF6). All variants feature mandatory five-prevention interlocking to prevent misoperation, and intelligent designs integrate online monitoring of partial discharge, temperature, and mechanical characteristics.

Our in-house R&D team designs HV switchgear lineups around the buyer's actual system voltage and short-circuit parameters, configuring voltage level (3.6kV–40.5kV), insulation medium (air, gas, or solid), and current rating combinations rather than pushing a single standard cubicle. This technical customization means the cubicle size, busbar rating, CT/PT ratio, and protection relay setting scheme are developed to the project's single-line diagram-so the panel arrives engineered for the incoming grid, not adapted in the field.