The Oil-immersed Voltage Transformer (EVT) uses transformer oil as the main insulating medium and adopts an oil-paper insulation structure. It converts primary high voltage into standard secondary low voltage through electromagnetic induction, providing voltage signals for metering, measurement, relay protection and automatic control in power systems.

Outdoor substations

Suitable for 35kV–110kV outdoor substations, mainly used for busbar voltage monitoring, line protection and gateway energy metering.

Indoor distribution substations

Suitable for traditional 10kV indoor distribution substations with low space requirements and high demand for long-term stability.

High-insulation applications

Compared with epoxy resin cast types, it is more suitable for systems requiring higher insulation strength and long-term operational stability.

Harsh outdoor environments

Suitable for areas with large temperature differences, high humidity and long-term outdoor exposure.

Polluted industrial areas

Performs better than cast types in heavily polluted and high-humidity environments, such as mines, chemical plants, coastal regions and industrial zones.

Industrial and new energy systems

Applied in industrial and mining enterprises, rail transit, wind power and PV step-up stations for 35kV outdoor voltage collection and protection, especially in environments with strong interference.

Wide application

Designed for harsh outdoor environments and higher voltage applications, this product is widely used as voltage sensing equipment in medium- and high-voltage transmission and distribution systems.

Oil-immersed insulation

With a fully sealed or semi-sealed oil tank filled with high-quality insulating oil, it provides insulation, heat dissipation and arc-extinguishing performance.

Stable performance

It features high insulation strength, strong overload capacity, stable operation and excellent accuracy retention.

Item Name	Parameter
Rated Primary Voltage	10kV, 35kV, 66kV, 110kV
Rated Secondary Voltage	100/√3V, 100V, 100/3V (Zero‑sequence)
Rated Frequency	50Hz
Accuracy Class	0.2, 0.5 Class for Metering; 3P, 6P Class for Protection
Rated Capacity	15 ~ 300VA
Insulation Type	Oil‑impregnated Paper Insulation
Cooling Method	Oil‑natural Air‑natural (ONAN)
Insulation Level (Take 35kV as Example)	40.5/95/200 kV
Creepage Distance	Complies with Pollution Level II ~ IV
Temperature Rise	Oil Surface Temperature Rise ≤55K