Abstract
Fault location is an important diagnostic task in condition monitoring of underground medium voltage cables. Available solutions are well capable of determining the location of a single partial discharge (PD) defect on a cable section. In case several PD defects are active simultaneously along a cable section, the interpretation of the measured data becomes complex to identify the presence of more than one PD sources. In this paper, experimental investigation of two PD defects/sources at different locations on a medium voltage (MV) cable section is presented. A high frequency current transformer is used for single end PD measurements. Time domain reflectometry-based in-depth study of the reflected pulses provides the most valuable information to identify the presence of PD sources which further leads to the location of the individual PD sources. In this paper, the proposed solution is presented for two PD sources, however, the same methodology can be extended to locate multiple PD sources on the cable.
Highlights
Overhead power lines are highly vulnerable to various external and climatic factors, such as faults initiated by accidents, adverse weather conditions and natural disasters
Studies made by Consolidated Edison, Inc. and Florida Public Service Commission have suggested converting the overhead lines to underground cables and provided estimated costs in the range of billions of dollars to accomplish this conversion for New York and Florida [1]
This paper proposes a simple approach based on time domain analysis for identification and separation of partial discharge (PD) pulses from different sources, configuring the number of PD sources, and the location of the PD sources in power cables
Summary
Overhead power lines are highly vulnerable to various external and climatic factors, such as faults initiated by accidents, adverse weather conditions and natural disasters. Antenna and acoustic sensor based techniques have been used for the location of multiple PDs of the same type using PD pulse analysis in the substation equipment such as power transformers, switchgear, and similar types of enclosed system components These techniques are often, not effective when investigating cables. When two or more PD sources are active simultaneously on a cable section, the sensor(s) at the end(s) of the cable record the emitted (original) PD signals indiscriminately together with the reflected pulses propagating along the line. This makes the implementation of location techniques a complex task. Practical issues regarding cable length and the capabilities of the measuring sensor are discussed briefly while DAS and data interpretation will be discussed
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