Showing papers on "VLF cable testing published in 2004"
21 Nov 2004
TL;DR: In this article, a systematic approach for condition assessment of HV power cable systems is proposed based on the assumption that there is not one dominant failure process in HV cable networks, PD in the cable insulation cannot be seen as the only messenger for failures.
Abstract: In this contribution based on experiences made in the Netherlands, for condition assessment of HV power cables systematic approach has been developed. Based on the assumption that there is not one dominant failure process in HV cable networks, PD in the cable insulation cannot be seen as the only messenger for failures: the complexity of cable systems in HV networks is often higher (e.g. oil-filled, gas-pressurized cable systems) therefore different approaches have been investigated and implemented in the last five years.
28 citations
TL;DR: In this article, a cable voltage drop compensation scheme for ground power units (GPU) is presented, which is able to predict and compensate the voltage drop in an output cable by measuring the current quantities at the source.
Abstract: In this paper a new cable voltage drop compensation scheme for ground power units (GPU) is presented. The scheme is able to predict and compensate the voltage drop in an output cable by measuring the current quantities at the source. The prediction is based on an advanced cable model that includes self and mutual impedance parameters. The model predicts the voltage drop at both symmetrical and unbalanced loads. In order to determine the cable model parameters an automatic identification concept is derived. The concept is tested in full scale on a 90-kVA 400-Hz GPU with two different cables. It is concluded that the performance is significantly improved both with symmetrical and unsymmetrical cables and with balanced and unbalanced loads.
20 citations
19 Sep 2004
TL;DR: In this article, the authors present the practical experience in on-line partial discharge (PD) measurements of medium voltage (MV) motors in a complex petroleum refinery and present the results of their experiments.
Abstract: This work presents the authors' practical experience in on-line partial discharge (PD) measurements of medium voltage (MV) motors in a complex petroleum refinery.
8 citations
Patent•
18 Oct 2004TL;DR: In this article, maximum and minimum voltages on each of CAN-H and CAN-L cables of the network are measured for detecting short-circuit between the cables, shortcircuit in the CAN-C cable and ground or battery.
Abstract: The process involves sending a specific frame over a high speed (HS) CAN network. Maximum and minimum voltages on each of CAN-H and CAN-L cables of the network are measured for detecting short-circuit between the cables, short-circuit between the CAN-H cable and ground or battery, short-circuit between the CAN-L cable and ground or battery, open-circuit on the CAN-H cable or on CAN-L cable and mass loss of computer.
5 citations
19 Sep 2004
TL;DR: VLF testing is being considered as the safe alternative to DC Hipot testing of XLPE and mixed cables, which will cause premature failures in this type of cable because of the known problem of induced space charges.
Abstract: The IEEE standards group is currently addressing the topic of field testing methods for underground power cables. The first step has been accomplished by issuing the IEEE 400 document, which is also referred to as the Omnibus document and serves as the umbrella for all field test methods to be covered under individual standards or user guides within the 400 series of documents. The IEEE 400.1 document will become the new test document covering all field DC test methods. The IEEE 400.2 will address very low frequency AC field test methods, also referred to as VLF test methods. VLF testing is being considered as the safe alternative to DC Hipot testing of XLPE and mixed cables, which will cause premature failures in this type of cable because of the known problem of induced space charges. The paper compares different VLF technologies and discusses the correlation between field test data and test parameters.