Real-time monitoring of high-voltage transformers, oil regeneration equipment, rolling mills, etc.: Conductivity κ, dielectric constant ε, and temperature T are precisely measured to detect changes in oil condition.

Initial change detection

From day 1, before oil quality/condition is compromised. Contamination products such as particles, cellulosic fibers, moisture and contamination effects such as acids and oil soaps change the electrical properties of the oil. With the oil quality sensor OilQSens®, dependent parameters are measured continuously online. Evaluate the condition of transformer oil from oil changes. Dissolved gas analysis (DGA) is a sampling technique that can miss intermittent problems. OilQSens® continues to operate online from day 1, before the detection limits of other technologies. Conductivity, permittivity and temperature are measured by: High precision. Both conductivity and permittivity depend on temperature.

Self-adaptive temperature compensation function

Algorithm similar to a neural network. The electrical conductivity of oil is very low. However, the highly sensitive OilQSens® measures conductivity down to 0.1 picosiemens per meter and all values are accurately temperature compensated. Relative permittivity is a measure of dielectric constant. The permittivity measurement by OilQSens® determines moisture penetration and changes in the dielectric strength of the oil. Clear pictures taken with the conductivity values show changes in the oil.

Oil monitoring in transformers, high voltage circuits
Breakers and oil recovery plants provide efficiency and
Important parameters for safety
As oil ages, conductivity decreases.
Forms changing charge carriers
Formation of charge carriers
The process involves a metal catalyst, oxygen and
Accelerated by the presence of temperature
The loss angle tan δ is the conductivity and
Calculation from permittivity
According to IEC61620
Measurements are based on
Alternating current square wave with low voltage and frequency
The distributed monitoring system based on voltage web is
Ideal for remote or inaccessible locations
Measurements are made on LAN, WLAN or
Transmission via serial interface


Fluid measurement

Conductivity 0.1 to 100,000 pS/m
(max. 2,000,000 pS/m)
Relative permittivity 1 to 5
Sensitivity 0.1 pS/m
Relative permittivity 1 x 10 ^-6

Operating conditions

Oil pressure 60 bar at 20 °C (870 psig 68 °F)
Oil temperature -10 to 70 °C (max. -40 to 150 °C
Operating Temperature -20 to 70 °C