Controls & Instrumentation

All of these devices measure and display or record and communicate data relevant to transformer operation. They range from products for smaller distribution transformers to larger more sophisticated performance, diagnostic or condition monitoring systems. WEIDMANN has a wide variety of options available in the fields of monitoring systems, oil level indicators, pressure and temperature measuring.

Field of Application
This product groupe includes devices that measure or record the dielectric liquid level, the direction of fluid flow, dielectric liquid temperature, hot spot temperature, the pressure/vacuum level etc. Many of these devices are available with switches and can be used to control accessory operation. They are used in the distribution and power transformer industry.


Monitoring Systems
On Line Monitoring Systems are designed to maintain constant surveillance of the transformer, measuring, recording and reporting performance and/or condition parameters.

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
Pressure devices prevent pressure induced explosions. Pressure relief devices limit the transformer internal pressure to a defined maximum.

Temperature Devices
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.