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Jongen R.,Seitz Instruments AG | Quak B.,Seitz Instruments AG | Tenbohlen S.,University of Stuttgart | Gulski E.,Poznan University of Technology
Proceedings of 2012 IEEE International Conference on Condition Monitoring and Diagnosis, CMD 2012 | Year: 2012

This contribution presents new developments in the field of on-site (E)HV cable testing, in particular testing of long lengths of power cable. A modern solution is presented for on-site testing and diagnosis of transmission power cables by means of sinusoidal damped AC voltages. With this testing technique on-site voltage testing is performed with additional non-destructive measuring techniques e.g. partial discharges or dissipation factor measurements. To improve the PD detection and particularly the PD location possibilities on long cable lengths an additional range extension measurement system has been developed for PD detection on longer cable lengths. This distributed measurement system can be installed at cable accessories to detect PD signals. © 2012 IEEE.


Cichecki P.,Technical University of Delft | Gulski E.,Technical University of Delft | Smit J.J.,Technical University of Delft | Chmura L.,Technical University of Delft | Jongen R.,Seitz Instruments AG
Conference Record of IEEE International Symposium on Electrical Insulation | Year: 2010

Diagnostics of HV power cables are playing an important role in the meaning of two aspects: 1) on-site diagnostic of new installation, where a commissioning test has to prove the absence of any defects in the cable insulation and accessories, after transportation and installation. 2) On-site diagnostic of a serviced aged power cable where the condition after a period in service or information about workmanship of repairs has to be known. As it is known some installation defects can result in breakdown even after a successful after-laying test. Obtaining more diagnostic parameters like; Withstand Voltage, Partial Discharges (PD) and Dielectric Loss (tan δ), providing a indication of insulation condition and accessory performance. In this paper several examples of on-site tests on new and serviced aged XLPE HV power cables will be discussed. Examples of: after-repair, after-laying, and condition assessment tests will be presented as performed with Damped AC diagnostics. © 2010 IEEE.


Erbrink J.J.,Technical University of Delft | Gulski E.,Technical University of Delft | Smit J.J.,Technical University of Delft | Leich R.,Liandon Inc. | And 2 more authors.
IEEE Electrical Insulation Magazine | Year: 2011

On-load tap changers (OLTC) that are in critical condition and require maintenance can be selected on the basis of diagnostic measurement results. Resistance measurements are particularly suitable for assessment of OLTC degradation and to reveal OLTC defects that could lead to failure (see Figure 1). This article discusses dynamic resistance measurements (DRM) on OLTCs. In Part 1 of this series [1], DRM as a diagnostic method for OLTCs was discussed, and a few case studies were presented. In this part the interpretation of the results will be discussed. © 2011 IEEE.


Jongen R.,Seitz Instruments AG | Seitz P.P.,Seitz Instruments AG | Smit J.,Technical University of Delft | Strehl T.,Onsite Hv Technology AG | And 2 more authors.
Proceedings of 2012 IEEE International Conference on Condition Monitoring and Diagnosis, CMD 2012 | Year: 2012

A modern tendency is to perform condition-based rather than time-based maintenance on power transformers. This requires the use of diagnostic measurements to know the condition of the tap changer and to determine when and what kind of maintenance is necessary. In addition, diagnostic measurements on OLTCs can be used for the pre-failure detection of defects not seen during maintenance and to assess the condition of parts that are not easily accessible. A number of diagnostic tests can be performed and utilities combine different tests to determine its need for maintenance. Several utilities apply dynamic resistance measurement (DRM) to OLTCs during regular maintenance. Results showed that DRM is sensitive to major degradation mechanisms in on-load tap changers. © 2012 IEEE.


Jongen R.,Seitz Instruments AG | Quak B.,Seitz Instruments AG | Gulski E.,Poznan University of Technology | Cichecki P.,Technical University of Delft | De Vries F.,Alliander
Proceedings of 2012 IEEE International Conference on Condition Monitoring and Diagnosis, CMD 2012 | Year: 2012

Many parameters can influence the quality of the PD measurement and various issues are important during the execution of a PD measurement. In particular when testing long lengths of MV cables the PD detection sensitivity and particularly the PD site location is affected. To increase the measurement sensitivity the measurement system can be extended with an additional PD measuring unit at the far end of the cable. This unit measures PD activity with the conventional standardized PD detection synchronized with the damped AC test voltage. This two sided measurement provides higher detection sensitivity in the case of long cable lengths. Furthermore, when the measurement data of the 2 units at both ends of the cable are combined with each other, further analyses provides the PD site location in case of measured PD activity. In this way it is possible to test and diagnose longer lengths of MV cables. © 2012 IEEE.

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