Oil Level Indicators
Oil level indicators are used to detect dielectric fluid leakage in an early stage permitting actions to be taken to ensure that the transformer windings remain covered with the dielectric fluid. These devices are available in mechanical or magnetic form, with and without microswitches. The oil level indicators are designed to international standards. Buchholz relays are protection devices that monitor gas and oil movements. Oil flow indicators are used in the feed, outlet/drain pipes of the cooling systems.
Pressure devices prevent pressure induced explosions. Pressure relief devices limit the transformer internal pressure to a defined maximum.
Temperature has been determined to be an important influence on the life of a transformer; since excessive temperature accelerates the aging of the electrical insulation systems. Weidmann supplies devices for measuring, recording and communicating the dielectric fluid temperature as well as the winding hot spot temperature. Temperature devices are designed to international standards.