- +61 7 3374 2877
- Email Us
Menu
It is well known that local failures in oil-filled power transformers are caused by partial discharges (PD) in the electric insulation. Continuous deterioration over time increases the defect which can eventually lead to a breakdown of the entire insulation.
However, conventional PD measurements, such as those specified by the IEC 60270 standard, are often affected by noise in the surrounding environment – especially during on-site commissioning and troubleshooting. As an alternative, Ultra-High Frequency (UHF) PD measurements offer a sensitivity higher than any other kind of PD measurement, such as Dissolved Gas Analysis, acoustic or conventional measurements. Performing PD measurements inside the transformer tank in the UHF range ensures that they are robust against noise in the surrounding environment. The portable UHF 800 PD measurement system is OMICRON’s latest solution for performing off-line and on-line UHF PD measurements from 100 to 2000 MHz on oil-filled power transformers. Tunable bandwidth filters ensure an optimal signal-to-noise ratio for reliable PD analysis in noisy onsite testing environments.
Partial discharge (PD) testing is a highly effective tool for insulation condition assessment and critical defect detection in oil-filled power transformers so that corrective actions can be taken before failures occur.
Measurement Alternative for Noisy Environments
PD measurements performed in the Ultra-High Frequency (UHF) range of 100 to 2000 MHz are a reliable measurement alternative. These UHF PD measurements are especially useful for on-site PD testing on oil-filled power transformers since they are robust against external signals.
This is because numerous noise sources, such as mobile communications, radar signals, and corona discharges, predominantly transmit in lower or narrow frequency ranges. By comparison, PD measurements performed in the UHF range result in a very high signal-to-noise ratio. Therefore, optimal PD measurement sensitivity is ensured with little or no interference from external noise for the most reliable defect detection and insulation condition assessment.
Reliable UHF PD Testing
The portable UHF 800 PD measurement system is OMICRON’s latest solution for performing off-line and on-line UHF PD measurements from 100 to 2000 MHz on oil-filled power transformers. Tunable bandwidth filters ensure an optimal signal-to-noise ratio for reliable PD analysis in noisy onsite testing environments.
The system’s portable and flexible modular design enables fast and easy setup during type and routine testing in HV laboratories or test bays, on-site commissioning, and troubleshooting in the field.
Single-Channel or Multi-Channel Testing
One UHF 800 measurement device is used to detect PD activity in the UHF range for each measurement channel. Up to 20 measurement devices can be connected via fiber optic cables in a daisy chain for simultaneous, multi-channel PD measurement and analysis. Each UHF 800 measurement device is powered by the accompanying RPB1 rechargeable external battery for hours of uninterrupted testing.
