VHF Magnetic and Electric Antennas for PD Measurements in GIS
An accepted method for insulation diagnosis is partial discharge (PD) measurements, and in many cases, it is a requirement in the acceptance protocol. The PD charge magnitude is not only an important parameter for insulation degradation assessment but also harmonizes readings from different sensors: the charge magnitude reading is independent of the sensor characteristics if adequately calibrated and measured. The IEC 60270 is a standard for “conventional methods” where the device under test is electrically small; PD analysis in test objects that electrically behave as distributed parameters devices is out of the scope of the standard. This is the case of gas-insulated substations (GIS). It is demonstrated that nonconventional detectors, dealing with conducted signals and in a specific frequency range, can provide calibrated charge magnitudes.
This research proposes a magnetic and electric sensor in the very-high frequency range capable of measuring and estimating the PD charge in gas-insulated substations and for online applications. For that, the research covers the following subjects:
- PD propagation in gas-insulated substations.
- PD defects in gas-insulated substations.
- Sensor's design and characterization.
- Charge and calibration method for PD charges in GIS.
- Noise and interference discrimination technics.
The measuring process is validated in a full-scale GIS.
Supervisor and promotor:
Dr. Armando Rodrigo Mor: arrodmor@ite.upv.es
Promotor:
Prof. Ir. Peter Vaessen: P.T.M.Vaessen@tudelft.nl
