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 |
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Specification
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 |