Douglas Electrical Components provides hermetic feedthrough solutions for oil transformers, where liquid insulators such as mineral oil and ester-based dielectric fluids are used for cooling and electrical insulation. Because these fluids can degrade over time and create risks from leaks or harmful gas exposure, reliable hermetic sealing is critical to maintaining safety, performance, and long-term system integrity.

The company manufactures hermetic wire feedthroughs that create high-density, customized seals for wires passing through transformer housings. These feedthroughs support vacuum and positive pressure applications and can be designed with NPT threads, radial O-ring seals, bulkhead fittings, and other custom mechanical interfaces. They allow secure transmission of power and signal in, out, and within transformer equipment.

Connector-to-wire feedthroughs with integrated connectors simplify installation, improve quality, and reduce manufacturing time, especially in applications like network protectors and outdoor electronics where moisture protection is essential. For high-voltage power transmission, Douglas also offers customized StudSeal terminal feedthroughs with threaded copper studs, flanged housings, and heavy-gauge wires. Standard designs support 15kV, with custom options up to 30kV, providing durable, long-term performance for transformer assemblies.

In addition, Douglas supports sensor-based condition monitoring by hermetically sealing sensing elements used in dissolved gas analysis and predictive maintenance systems. These seals protect electronics while allowing sensors to remain exposed to oil and gas conditions for accurate monitoring. With extreme temperature, pressure, and vacuum capabilities, along with 100% leak and electrical testing, these hermetic solutions ensure reliability in critical transformer applications.