Measurement of insulation losses is performed during periodic maintenance and inspection of high voltage equipment like power transformers, bushings, motors, generators, etc.
The MIDAS is a valuable tool for such measurements especially in the harsh electrical environments experienced in substations and other field locations.
Designed for testing at local power-line frequency (50 Hz or 60 Hz), MIDAS automatically measures and records dissipation factor (tan δ), power factor (cos ϕ) and all other relevant values of impedances (capacitive, inductive and resistive). Damage to or changes in the insulation material are detected rapidly and reliably.
The rugged construction and large pneumatic wheels make transportation and access to remote locations easy.
Predefined test sequences linked with limiting values (e.g. previous measurements) guide the user automatically through the test sequence and make possible a first assessment on-site. Communication with laptop trough standard interfaces (Ethernet) enable easy data exchange with a host computer for data collecting, reporting, printouts, statistics and advanced analysis.
Advantages
Shortest Measuring Time: Shortest equipment set-up and measuring time by an “all in one” unit
Rotating machines testing: The up to 15 kV (MIDAS 2881G) and 4 kVA embedded power supply allows measurement of rotating machines of up to 24 kV at nominal voltage (13.85 kV). The optional resonating inductors increase the measuring load up to 1.41 μF
Highest Accuracy: The Highest accuracy in field-testing instruments has been achieved by using latest measuring techniques. High long-term stability of system accuracy has been ensured by utilization of a gas-insulated standard capacitor as internal reference arm and self-calibrating measurement sensors.
Advanced interference suppression: allows measurement in extremely noisy environments
Simultaneous partial discharge and tan (Dissipation factor) test: The MIDAS 2881/2881G inherent Low Partial discharge level in combination with a DDX 9121b (optional) allows both tan δ (Dissipation factor) and partial discharge tests to be made simultaneously, for example on rotating machines
Self-explanatory user interface. Manual and Automatic test operation. Software assisted test planning, preparation, execution and trending analysis function to get a quick graphical assessment
Can be used for other applications or with external power supplys and external nominal capacitors for higher voltages measurements in the laboratory
Applications
Power Transformers
Distribution Transformers
Instrument Transformers
Rotating Machines
Liquid Insulation
Bushings
Cables
Capacitors
Circuit Breakers
Surge Arrestors
