Transient overvoltages on an HVDC bipolar line during monopolar line faults

Melvold, D.J.; Odam, P.C.; Vithayathil, Joseph

doi:10.1109/t-pas.1977.32370

Cited by 18 publications

(6 citation statements)

References 5 publications

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“…An LG fault, however, leads to a step‐like response because it generates a step wave at the fault point. The ITVs under this condition tend to reach steady values that are much larger than zero . Such difference in the voltage response can be used to differentiate lightning‐caused disturbances from LG faults.…”

Section: Protection Scheme Developmentmentioning

confidence: 95%

A sensitive and high-speed traveling wave protection scheme for HVDC transmission line

Cai

Han

et al. 2013

Int. Trans. Electr. Energ. Syst.

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SUMMARYThis paper presents a novel traveling wave protection scheme to satisfy the sensitive and high-speed performances of protective relaying for line commutated converter high voltage direct current (HVDC) transmission lines. The scheme performs by using a startup and two auxiliary criteria with a small sampling interval to ensure the sensitivity of fault detection: the startup criterion adopts the concept of voltage derivative to distinguish between internal and external faults; the two novel auxiliary criteria adopt concepts of voltage difference and voltage ratio to deal with noise interference, which is brought to the fore by using small sampling interval. Besides high sensitivity, the scheme is able to achieve an excellent high-speed performance because it acts only on the basis of the first waveform following a fault. Simulation studies have been conducted in power systems computer aided design/electromagnetic transients including direct current (PSCAD/EMTDC) to evaluate the scheme, which shows that the scheme permits both high speed and high sensitivity for direct current line fault detection at a satisfactory level.

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Section: Protection Scheme Developmentmentioning

confidence: 95%

A sensitive and high-speed traveling wave protection scheme for HVDC transmission line

Cai

Han

et al. 2013

Int. Trans. Electr. Energ. Syst.

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“…Negative pole cable The response of the hybrid DC circuit breakers was tested by creating artificial short-circuit faults at the end of the cable. The conventional approach involving dropping a ground-connected wire onto one of the pole cables manually controlled by experimenter [19,20] which would not only be difficult and dangerous to operate, but would also be unsuitable for triggering a PP fault. Instead, these tests were carried out by connecting the end of each pole cable to top-mounted bars serving as contact terminals, shown in Fig.…”

Section: Positive Pole Cablementioning

confidence: 99%

“…Experimental test under the fault is not a common option to study the characteristic of the converter station model due to its high difficulty and cost to implement. A series monopolar pole-to-ground faults were performed on a LCC-HVDC system to investigate the influence factors to fault overvoltage [19]. An artificial single-pole to ground short circuit test in Nanao ± 160kV three terminal VSC-HVDC system of China has been operated.…”

Section: Introductionmentioning

confidence: 99%

On-Site Experimental Analysis for Impact of Wideband Terminal Model to Transient Overvoltage Based on a Full-Scale 200kV MMC-HVDC Converter Station

Cozza

Song

et al. 2023

Preprint

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This paper investigates the impact of power converter station modeling to high frequency overvoltage based on the on-site experimental test of a fully operational 200 kV MMC-HVDC converter station. Artificial short-circuit faults were generated in the system with hybrid DC circuit breakers along coaxial cables by means of an unmanned aerial vehicle for the first time. Fault transients recorded during the tests are found not to comply with the typical framework where power stations are assumed to present a high impedance, or at least dominated by the reactor inductance. This discrepancy is proven to be caused by parasitic elements at the terminals of the converter station, resulting in a spurious low-frequency resonance dominating fault transients. A wideband converter station model is proposed and validated by the test data. The simulation results show that the proposed wideband model should be adopted avoiding the risk of huge resonance bias in short line distance. When fault distance is 10 km away, converter station model will converge to standard AVM, while the high impedance or reactor model is no longer valid. The experimental data provide a benchmark to validate the converter station model for transient overvoltage or electromagnetic interference under the fault condition.

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“…Tables V, VI, and VII show the percent standard deviation of each time to flashover as defined in (3). No specific pattern has been identified.…”

Section: E Time To Flashovermentioning

confidence: 99%

Performance of Composite Outdoor Insulator Under Superimposed Direct and Switching Impulse Voltages

Pinzan

Branco

Haddad

et al. 2021

IEEE Trans. Power Delivery

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High Voltage Direct Current (HVDC) systems are increasingly being adopted around the world to integrate renewable resources, increase power transfer, and allow flexible grid operation. HVDC overhead lines play a critical role in this, and focus is needed on the research of composite outdoor insulators failure. In the case of a pole to ground fault of a bipolar scheme, the healthy pole experiences a slow transient overvoltage similar to a Switching Impulse (SI) superimposed on the operational DC voltage. However, there is no standard test for such voltage superimposition. This paper investigates the performance of a composite insulator stressed with such superimposition under dry and rain conditions. To determine the direct voltage influence on the flashover voltage, the results have been compared with the SI only case. Four different rain conductivities have been used in the test program because these insulators can be exposed to different acid conductive rain types, typical of industrialized environments. Both vertical and horizontal orientations have been studied. It was possible to conclude that, in most cases, the direct voltage pre-energization has a negative impact on the flashover performance. The increase in rain conductivity leads to lower flashover values, and the horizontal orientation outperforms the vertical configuration. Under these test conditions, the flashover voltages were all larger than a typical DC operational switching surge. Thus, in the case of pole to ground fault, the healthy pole failure risk appears to be low. However, further research is needed on higher voltages and polluted conditions.

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Transient overvoltages on an HVDC bipolar line during monopolar line faults

Cited by 18 publications

References 5 publications

A sensitive and high-speed traveling wave protection scheme for HVDC transmission line

A sensitive and high-speed traveling wave protection scheme for HVDC transmission line

On-Site Experimental Analysis for Impact of Wideband Terminal Model to Transient Overvoltage Based on a Full-Scale 200kV MMC-HVDC Converter Station

Performance of Composite Outdoor Insulator Under Superimposed Direct and Switching Impulse Voltages

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