Abstract
Nowadays, with the widespread use of High Voltage Direct Current (HVDC) cables in power systems, the measurements of space charges in full-size cables are becoming more relevant. One of the most common methods used for space charge measurements is the Pulsed Electro-Acoustic (PEA) method. This paper analyzes two factors that influence the electromagnetic interference on the piezoelectric signal. These factors are the connection of the injected pulsed voltage at the PEA test cell and the grounding of the PEA test cell. The influence was analyzed by means of experimental tests to compare different configurations and the electromagnetic distortion created in each one of them. It was observed that the physical location of the pulsed voltage at the electrode has a very important impact on the magnitude of the electromagnetic distortion. Moreover, it is shown that the physical connection of the grounding and the existence of a parasitic capacitance at the PEA test cell are also an important source of distortion.
Highlights
Space charge measurements in High Voltage Direct Current (HVDC) cables are becoming more relevant due to the increase of polymeric materials for cables in HVDC systems
The aim of this paper is to analyze practical aspects of the construction of the acoustic method for space charge measurements known as the Pulsed Electroacoustic (PEA) method used in full-size HVDC
It was observed that the physical location of the pulse voltage connection at the test cell electrode had expected as the applied transient electric field is inverted in each configuration
Summary
Space charge measurements in High Voltage Direct Current (HVDC) cables are becoming more relevant due to the increase of polymeric materials for cables in HVDC systems. The acoustic and thermal methods are the most common non-destructive methods for measuring space charges in a dielectric [11,12,13,14,15,16,17,18,19]. The practice of measuring space charges in full-size cables, instead of mini cables, has the advantage of assessing the manufacturing process of cables, as well as allowing for the ability to test a combination of variables that can only be achieved in full-size cables, such as the combination of absolute temperatures and temperature gradients [23]
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