Abstract
Partial discharge (PD) measurements have proved their reliability for health monitoring of insulation systems in power system components including synchronous generators, power transformers, switchgear and cables etc. Online condition monitoring and pro-active detection of PD faults have been highly demanded over the last two decades. This paper provides results from a research project to develop advanced non-intrusive sensing technologies that are cost effective, reliable and efficient for early detection of PD faults in medium voltage (MV) and high voltage (HV) air-insulated switchgear. Three sensors (high frequency E-field (D-dot) sensor, Rogowski coil and loop antenna) have been developed and tested under various PD faults and their performance were evaluated in comparison with high frequency current transformer (HFCT) which is being used commercially for PD testing and measurement. Among these three sensors, it is shown that D-dot sensor and Rogowski coil are more dependable when it comes to the PD measurements due to their high signal to noise ratio and hence high accuracy. These sensors can be customized according to a specific application and can be connected together with one data acquisition device while developing an online condition monitoring system.
Highlights
Switchgear is a set of equipment consisting of circuit breakers, isolating switches, fuses, instrument transformers (CT—current transformers, PT—potential transformer) and relays, used to distribute electrical power as well as protect and isolate a certain line during a fault
This paper investigates partial discharge (PD) measurements in air-insulated metal clad switchgear
Three sensors which are differential electric field sensor (D-dot sensor), Rogowski coil and loop antenna have been developed and tested for the detection of PD faults in air-insulated metal-clad switchgear in high voltage (HV). Laboratory and their performance is evaluated in comparison with a widely accepted PD sensor i.e., High Frequency Current Transformer (HFCT)
Summary
Switchgear is a set of equipment consisting of circuit breakers, isolating switches, fuses, instrument transformers (CT—current transformers, PT—potential transformer) and relays, used to distribute electrical power as well as protect and isolate a certain line during a fault. Three sensors which are differential electric field sensor (D-dot sensor), Rogowski coil and loop antenna have been developed and tested for the detection of PD faults in air-insulated metal-clad switchgear in HV laboratory and their performance is evaluated in comparison with a widely accepted PD sensor i.e., High Frequency Current Transformer (HFCT). The sensors used for PD measurement and their working principles along with the equivalent models are explained
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