Abstract
In the paper results of simultaneously conducted measurements achieved using capacitive and inductive sensors are presented according to different PD model sources immersed in a mineral transformer insulation oil. All measurements are preceded under laboratory conditions using typical measurement set up commonly applied for on-site PD detection: measuring impedance and capacitor and high frequency current transformer (HFCT) are used respectively. Measuring frequency and voltage level influence as well as phase resolved PD patterns analysis are investigated in the research. Various fundamental PD signal descriptors assigned for selected frequencies are also proposed and compared for chosen sensors. The main purpose of the presented research is to compare PD measurement results achieved using selected type of sensors during laboratory measurements and to point the best application areas in fields of PD detection in high voltage apparatus under normal operating conditions. Furthermore a proper measurement results interpretation coming from different sensors as well as measurement conducting problems and achieved patterns disparities are also discussed in the paper.
Highlights
Monitoring of electrical power apparatus insulation system condition is a crucial item of fleet maintenance policy according to their reliability as well as providing a continuous electrical power supply for costumers [1,2,3]
Due to insulation system ageing process some degradation of dielectrics may occur which usually leads to local partial discharge (PD) generation
A phase resolved PD pattern (PRPD) has been widely known as an essential tool for a PD analysis provided by the electrical method (EM)
Summary
Monitoring of electrical power apparatus insulation system condition is a crucial item of fleet maintenance policy according to their reliability as well as providing a continuous electrical power supply for costumers [1,2,3]. PD detection is proved to be one of the most effective insulation condition monitoring tools. There are many well-known and widespread PD detection methods but only electrical method (EM) supports a calibrated apparent charge measurement [4,5,6,7,8,9]. Measured apparent charge values and phase angle of the power voltage cycle correlation have been supported by the PRPD. The highest effectiveness and analysis capabilities of the measured phenomena have been delivered by a PRPD pattern tool [10–14]. Any modification of the environment or the PD generation conditions radically affect the final measurement results. In most cases an individual, relative measurement result is not an explicit and its interpretation may differ with reference to different apparatus or environment conditions [15-17]. There are two sensor types designed for PD detection in EM method: inductive (Fig.1) and capacitive (Fig. 2) ones
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
