This epoxy resin capacitive voltage sensor（voltage transducer） is a core medium-voltage component manufactured by APG pressure gel process, integrating insulation support and voltage signal sensing for indoor power distribution systems. It is widely adopted in 10kV–35kV switchgear and complies with IEC 62271 and relevant domestic electrical standards, serving voltage indication, live display, voltage sampling and electrical interlock protection functions.
Its outstanding material and structural features underpin stable field performance. The whole body is cast from high-quality flame-retardant epoxy resin, featuring excellent dielectric strength, low partial discharge and compact shed design for optimized electric field distribution. The embedded brass threaded inserts deliver reliable mechanical connection strength, resisting cracking and loosening under vibration. Unlike traditional oil-filled voltage transformers, this dry-type sensor eliminates oil leakage, fire risk and routine maintenance work. It boasts strong resistance to humidity, dust and surface tracking, maintaining consistent sensing accuracy for long service cycles. Multiple specifications are available with varied heights and creepage distances to match different cabinet layouts.
A complete solution requires matched supporting accessories. It works with live display indicators, signal transmission wires, secondary signal acquisition modules and interlock relays to convert high-voltage signals into low-voltage output for monitoring units. It is normally installed together with epoxy support insulators, busbar clamps, earthing switches and current sensors inside the switch cabinet. Custom machined metal fittings and mounting gaskets are optional for non-standard cabinet retrofits.
It mainly applies to indoor medium-voltage switchgear such as KYN28 and RMU ring main units. Typical scenarios include urban distribution substations, industrial power distribution rooms, photovoltaic and wind power booster stations, data centre power supply systems and new-energy charging station power cabinets. It helps operators judge live status, implement anti-misoperation interlock and feed voltage data to protection controllers.
Compared with conventional voltage transformers, this sensor has smaller size, lighter weight and lower cost. It focuses on status detection rather than high-precision metering, which fits the mainstream safety design idea of modern medium-voltage switchgear. As power distribution systems develop toward intelligence, this epoxy voltage sensor remains a preferred component for cabinet internal voltage sensing and safety warning.
