Online Transient Measurements of EHV Cable System and Model Validation

Barakou, F.; Wouters, P.A.A.F.; Mousavi-Gargari, S.; Jong, Jan P. W. de; Steennis, E.F.

doi:10.1109/tpwrd.2018.2876163

Cited by 10 publications

(12 citation statements)

References 13 publications

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“…With ten unknowns (for unsynchronized measurements) and six fitted parameters also other sources of information must be employed. Reduction of the number of independent components M ij can be achieved by neglecting components when these are very small, or by having a symmetric positioning of sensors with respect to the phase conductors meaning that various matrix components are equal [7,10]. Also parameter estimates can be made and their uncertainties can be retrieved, e.g., from comparison with numerical electrostatic field simulations on the system.…”

Section: Measurement Analysis and Uncertaintymentioning

confidence: 99%

“…Which assumptions are to be made and what the effects will be on the uncertainty margins are specific for the configuration at the measurement site. Measurements of energization transients are obtained from a double circuit 380 kV line-cable-line connection [7]. More specifically, measurements were taken at the underground cable to overhead line transition points (at both cable ends) and near an overhead line termination at one of the substations.…”

Section: Measurement Analysis and Uncertaintymentioning

confidence: 99%

“…The chosen range with uncertainty covers both extremes. Electrostatic field simulation [7] provided a value of 40%. For M 5 an average value of M 4 and M 6 is taken as the distances are similar.…”

Section: Substationmentioning

confidence: 99%

“…A further assumption relates to the far end couplings, which are minor contributions due to the shielding by the terminations. Electrostatic field analysis provided an estimate of 2% [7], which is implemented with an uncertainty margin of 50%:…”

Section: Transition Pointmentioning

confidence: 99%

“…However, both the magnitude and the harmonic content of switching transient responses depend on a much more extensive part of the grid [9]. The complete Dutch EHV grid was modelled in PSCAD using frequency dependent transmission line models [7,15]. A second measurement campaign was arranged aiming for simultaneously recording using the D/I measurement system and the RC dividers present at the transition points.…”

Section: Reliability Of the Reconstructed Waveformsmentioning

confidence: 99%

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Accuracy and Reliability of Switching Transients Measurement with Open-Air Capacitive Sensors

2019

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Contactless capacitive (open-air) sensors are applied to monitor overvoltages near overhead line terminations at a substation or at the transition from underground cables to overhead lines. It is shown that these sensors, applied in a differentiating/integrating measuring concept, can result in excellent characteristics in terms of electromagnetic compatibility. The inherent cross-coupling from open-air sensors to other phases is dealt with. The paper describes a method to calibrate the sensor to line coupling matrix based on assumed 50 Hz symmetric phase voltages and in particular focuses on uncertainty analysis of assumptions made. Network simulation shows that predicted maximum overvoltages agree within typically 7% compared to reconstructed values from measurement, also with significant cross-coupling. Transient voltages from energization of an (extra-)high voltage connection can cause large and steep rising ground currents near the line terminations. Comparison with results obtained by a capacitive divider confirms the intrinsic capability in interference rejection by the differentiating/integrating measurement methodology.

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Section: Measurement Analysis and Uncertaintymentioning

confidence: 99%

Section: Measurement Analysis and Uncertaintymentioning

confidence: 99%

Section: Substationmentioning

confidence: 99%

Section: Transition Pointmentioning

confidence: 99%

Section: Reliability Of the Reconstructed Waveformsmentioning

confidence: 99%

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Accuracy and Reliability of Switching Transients Measurement with Open-Air Capacitive Sensors

2019

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Methodology and accuracy for non‐invasive detection of switching transient overvoltages from compensation coils connected to power transformers

Wouters

Deursen

Vermeer

2020

IET Science, Measurement & Technology

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Transient voltages from (dis)connecting compensation coils near high voltage transformers are studied. Non-invasive sensors are needed in order to exclude any influence by the measurement equipment on the overvoltage magnitude. This study describes results from open-air capacitive sensors as part of a differentiating/integrating measurement system. Its bandwidth (up to 10 MHz) allows to record large detail in the switching events. However, the coupling strengths and the cross-couplings inherent to the use of air capacitive sensors need to be determined. Calibration based on symmetric phase voltages during normal operation supplies part of the information. Three methods are compared to supplement this knowledge for establishing the complete coupling matrix between phase conductors and sensors. One method employs estimates from the system configuration, in particular, its symmetry. The other techniques extract information from fast transient events within the responses for both switching on and off. The decoupled waveforms from different methodologies align within their confidence bounds and predict the maximum overvoltage magnitudes within an accuracy of 5% when employing information from the fast transients. Based on measurements performed on two compensation coils, both tested three times, larger overvoltages occurred during energisation compared to de-energisation with maximum amplitude exceeding three per unit. (a) The sensor signals, waveforms after decoupling based on (b) Symmetry, (c) Energisation, (d) De-energisation. The arrows indicate instances where the crosscoupled oscillation from phases 1 and 3 start dominating the (faster) oscillation in the signal representing the interrupted phase 2 IET Sci. Meas. Technol.

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Research on Optical Fiber Sensor Localization Based on the Partial Discharge Ultrasonic Characteristics in Long-Distance XLPE Cables

Liu

Zhang

et al. 2020

IEEE Access

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To improve the safety and antielectromagnetic interference performance of partial discharge detection in high-voltage DC cables, partial discharge of cables is used as a criterion for characterizing insulation defects. An ultrasonic detection method for the partial discharge of optical fiber detection is carried out in a long-distance high-voltage DC operating environment. By analyzing the partial discharge mechanism and ultrasonic characteristics of DC cables, a correlation model between partial discharge ultrasonic waves and discharge quantity is established. The partial discharge charge of several common insulation defects is obtained experimentally, and an ultrasonic characteristic Sagnac fiber detection system is realized. Standard ultrasonic time domain signal detection and fiber-optic sensing probe directional experiments are performed. The influence of fiber sensing probes with different lengths on the sensitivity of partial discharge signals is investigated based on the frequency distribution characteristics of partial discharges. The ultrasonic wave is measured based on a fiber-optic probe and can perform multipoint detection, and the partial discharge of the ±320 kV flexible DC transmission system was tested based on the developed optical fiber sensing system. The experimental results show that the partial discharge signal detection of 6 km long cable can be realized, and the localization accuracy is less than ±80 m. It provides a practical monitoring method for the perception of long-distance transmission equipment operating states.

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Online Transient Measurements of EHV Cable System and Model Validation

Cited by 10 publications

References 13 publications

Accuracy and Reliability of Switching Transients Measurement with Open-Air Capacitive Sensors

Accuracy and Reliability of Switching Transients Measurement with Open-Air Capacitive Sensors

Methodology and accuracy for non‐invasive detection of switching transient overvoltages from compensation coils connected to power transformers

Research on Optical Fiber Sensor Localization Based on the Partial Discharge Ultrasonic Characteristics in Long-Distance XLPE Cables

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