Investigation of necessary modeling detail of a large scale EHV transmission network for slow front transients

Barakou, F.; Haverkamp, Alfred; Wu, Lei; Wouters, P.A.A.F.; Steennis, E.F.

doi:10.1016/j.epsr.2017.02.030

Cited by 3 publications

(1 citation statement)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The studied connection basically consists of a double circuit with 10.8 km cable in between two overhead line sections (4.4 km and 6.8 km length). 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].…”

Section: Reliability Of the Reconstructed Waveformsmentioning

confidence: 99%

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

2019

View full text Add to dashboard Cite

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.

show abstract

Section: Reliability Of the Reconstructed Waveformsmentioning

confidence: 99%