The Omicron DIRANA determines the dielectric properties of insulation within a wide frequency band. Based upon dissipation factor and capacitance, the system analyses the moisture content in oil-paper-insulation. The dielectric response is measured by a three-terminal measurement that includes the output voltage, the measurement current and a guard to prevent disturbances. DIRANA is the first dielectric response analyser which comes equipped with two input channels enabling significant time savings to be achieved.

Voltage Source
Measurement voltage - 200 Vpeak, Max continuous output current - 50 mApeak

Dissipation Factor, Capacitance
Dissipation factor - range 0…10, resolution 10-6
Accuracy for 1 mHz > f >100 Hz - 1 % + 3 x 10-4
Accuracy for f < 1 mHz and f > 100 Hz - 2 % + 5 x 10-4
Capacitance - 10 pF to 100 μF
Accuracy - 0.5 % + 1 pF

Time Domain Current Measurement (PDC)
Range, resolution - 20 mA, 0.1 pA
Input resistance - 10 kW
Accuracy - 0.5 % ± 1 pA

Frequency Domain Spectroscopy (FDS)
Measurement voltage - 200 Vpeak
Measurement current - 50 mApeak

Ranges for Combined FDS and PDC Measurement
Frequency - 5 kHz to 50 μHz(using approximation:10 μHz)

Measuring Time (based on frequency)
2 mHz to 1 kHz - approx. 15 min
100 μHz to 1 kHz - < 3 h
10 μHz to 1 kHz - < 6 h