Partial discharge location in power cables using a double ended method based on time triggering with GPS

Abstract

Partial discharge (PD) diagnostics is the most widely used tool to assess the insulation condition of insulated power cables which facilitates informed maintenance planning leading to extended service life of ageing assets. Time domain reflectometry (TDR) using a single ended or double ended approach is the most widely used method for locating PD sources. The success of the single ended method is dependent upon cable network design. However, by monitoring PDs at both ends of the cable, i.e. double-ended PD monitoring, higher accuracy of PD location can be achieved with a higher success rate. The double ended method is not widely used due to its complex system design, time synchronization and communication requirement between measurement units. This paper proposes a double ended PD location system which triggers on the predefined one pulse per second (1PPS) signal obtained from a global positioning systems (GPS) using novel time based triggering logic (TBTL) implemented in field programmable gate arrays (FPGA). This system ignores non-useable (not synchronized) data caused by flywheel 1PPS from GPS receiver due to any short-term loss of satellite signals which eventually reduces the PD location accuracy. Furthermore TBTL also ignores spurious triggering pulses radiated from noise sources within the substation. With the use of a communication link between two ends of the cable provided via mobile broadband together with TBTL, eliminated the acquisition of non-useable(not synchronized) data. Based on laboratory tests and on-site measurements PD location accuracy of less than ± 10 m can be achieved. The system design, laboratory tests and on-site measurements are discussed

A high‐efficiency portable system for insulation condition assessment of wind farm inter‐array cables with double‐sided partial discharge detection and localisation

“…The travelling wave method is the most commonly used approach for PD localisation of power cables [14][15][16][17][18][19][20][21][22]. It is mainly divided into two categories: single-sided [14] and doublesided methods [15]. Since an energised cable is always connected to others and the reflection at the remote side would be very weak, the single-sided PD location method can only perform satisfactorily on very short cables.…”

“…The travelling wave method is the most commonly used approach for PD localisation of power cables [14][15][16][17][18][19][20][21][22]. It is mainly divided into two categories: single-sided [14] and doublesided methods [15].…”

“…In principle, the $${B}_G$$ value depends on the frequency components of the measured PD signal. Since the main energy of the frequency bandwidth of the PD signals measured in MV cables is always within a few MHz [14, 15, 20, 22], $${B}_G$$ can be conveniently set as a few MHz, for example, 2 MHz, which is used in the subsequent laboratory and field experiments and is validated to be feasible.…”

A Double-Terminal Traveling-Wave-Based Method Using Novel Noncontact Sensors for Fault Location in Transmission Cable Lines

“…Analysis of the result shows that the error is due to the inaccuracy of BDS/GPS synchronization and the influence of fault wave velocity. The average error of BDS/GPS synchronization is 20 ns, which is equivalent to 3.44 m of the fault-wave distance [35]. To test the accuracy of the FVMD + WVD method, the results from several fault-location methods [24] are compared in Table III.…”

Robust Estimation of Arrival Time of Complex Noisy Partial Discharge Pulse in Power Cables Based on Adaptive Variational Mode Decomposition

“…The electromagnetic coupling detection method, which uses a high-frequency current sensor (HFCT) to couple the electromagnetic signal generated by the PD pulse without any damage of the cable body [6][7][8], is currently the most commonly used cable PD detection method. The multi-sensor travelling wave method, which can effectively eliminate the influence of wave velocity uncertainty [9][10][11], is a novel travelling wave based localization method using the coupled PD current pulse. In practice, the environment in which the cable is laid is complicated, and the real PD signal detected by the electromagnetic coupling component is seriously interfered by complex and strong noises.…”