Simulation and design of 500 kV DC cable terminal accessory based on ZnO varistor microsphere composites

Zhao, Xiaolei; Meng, Pengfei; Hu, Jun; Li, Qi; He, Jinliang

doi:10.1109/tdei.2019.008195

Cited by 16 publications

(10 citation statements)

References 22 publications

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“…1 Owing to the excellent overall performance of cross-linked polyethylene (XLPE) insulation, the highest operating voltage of AC XLPE cable is up to 500 kV. 2 In recent developments, a ±640 kV DC XLPE cable has been developed and passed the qualification tests. 3 However, with the continuous increase of transmission capacity, further improvement of the electrical properties of XLPE materials is urgently needed.…”

Section: Introductionmentioning

confidence: 99%

“…The high voltage power cables have been widely installed in the context of rapid worldwide urbanization 1 . Owing to the excellent overall performance of cross‐linked polyethylene (XLPE) insulation, the highest operating voltage of AC XLPE cable is up to 500 kV 2 . In recent developments, a ±640 kV DC XLPE cable has been developed and passed the qualification tests 3 .…”

Section: Introductionmentioning

confidence: 99%

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Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Hong

Chen

Zhu

et al. 2022

J of Applied Polymer Sci

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The effect of adding electron-buffering voltage stabilizer (1 wt% maminobenzoic acid) on the electrical tree-induced degradation of cross-linked polyethylene (XLPE) was studied at high temperatures. The electrical tree inception, growth, and partial discharge characteristics were simultaneously analyzed at 30, 50, and 70 C, respectively. The results showed that the growth rate of electrical tree and partial discharge activity as well as the discharge repetition rate, significantly increased with the temperature for pure XLPE and XLPE stabilizer blend. However, the XLPE stabilizer blend exhibited higher tree inception voltage, lower tree growth rate, and partial discharge activity than pure XLPE. The addition of the voltage stabilizer reduced the carbon layer thickness in the tree channel and offered higher resistance to the electrical tree growth. Surface potential decay demonstrated that the voltage stabilizer addition decreased the trap energy level, but increased the shallow trap density of the XLPE. Quantum chemical calculations showed that the voltage stabilizer enhanced the ability to buffer the high-energy electrons in the XLPE. A high-energy electron buffering mechanism was also proposed to explain the effect of voltage stabilizer on the electrical treeing and partial discharge activity in the XLPE at high temperatures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Hong

Chen

Zhu

et al. 2022

J of Applied Polymer Sci

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“…With growing demand on electric energy, high voltage direct current (HVDC) systems are used to transmit high electric power over long distances (Ghorbani et al , 2014; Zhao et al , 2020; Xiang et al , 2021; Yu et al , 2020). The electric field in DC insulations differ in comparison to the electric field in alternating current (AC) insulations due to the accumulation of space charges.…”

Section: Introductionmentioning

confidence: 99%

“…In electrical power engineering, the reliability of the components and the stability of the power transmission are of top most importance. For this purpose, the design of the HVDC components needs to ensure low electric field values within the total insulation under every circumstances (Zhao et al , 2020). To reduce high field values, field grading techniques are applied.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, electric field simulations of cable joints and cable terminations using geometric and nonlinear field grading techniques are, e.g. seen in Zhao et al (2020), Yu et al (2020); Ye et al (2018), Qi et al (2004); and Hussain and Hinrichsen (2017). The simulation results are used to analyze the electric field with and without different grading techniques.…”

Section: Introductionmentioning

confidence: 99%

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Electric field simulations of field grading techniques in HVDC cable joints

Jörgens

Clemens

2022

COMPEL

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Purpose In high voltage direct current cable systems, cable joints are known as the least reliable components due to the use of multiple dielectrics. Resulting from the electric field and temperature depending conductivity of the different dielectrics, field enhancement at critical areas, e.g. triple points, may result in accelerated aging and the failure of the component. To reduce the stress, different field grading techniques are applied. The purpose of this study is to investigate different grading techniques for cable joints. Different shapes of the electrode and a varying nonlinear conductivity of field grading materials (FGM) are used for the simulation of the electric field. Design/methodology/approach Coupled electro-thermal field simulations are applied for different joint geometries, to obtain the stationary electric field. Electric field simulations in cable joint using geometric and nonlinear field grading techniques are shown. Findings Using the geometric field grading, the shape of the stress cone determines the field values in critical areas (triple points). High stress reduction is obtained for a certain curvature of the stress cone. For the nonlinear stress control, materials with a higher conductivity in comparison to the cable and the joint material are used. A field reduction is obtained by increasing the total conductivity. On the other hand, this is also increasing the insulation losses within the total FGM. More applicable is the decrease of the switching field or the increase of nonlinearity, which is only locally increase the conductivity and the insulation losses. Furthermore, simulations results show that an approximately constant field reduction is obtained, if the nonlinearity is above a certain threshold. Research limitations/implications This study is restricted to a field dependency of FGM only. For impulse voltages, high temperature and electric conductivity values my result in a thermal runaway. Furthermore, only direct current field grading techniques are studied. Originality/value The field grading of cable joints, using geometric and nonlinear techniques, is analyzed. A comparison between the electric field, by varying the curvature of the ground stress cone or the FGM conductivity constants in a complex joint geometry is novel. With its effect on the electric fields, general requirements for the geometry (geometric field grading) or the values of the FGM constants (nonlinear field grading) are defined to obtain a sufficient field grading.

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Gradient structure design of zinc oxide varistor microsphere composites for efficient electric field grading

Zhao

Meng

Yang

et al. 2022

Composites Part A: Applied Science and Manufacturing

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Simulation and design of 500 kV DC cable terminal accessory based on ZnO varistor microsphere composites

Cited by 16 publications

References 22 publications

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Inhibition of electrical trees degradation of crosslinked polyethylene at high temperatures by electron‐buffering voltage stabilizers

Electric field simulations of field grading techniques in HVDC cable joints

Gradient structure design of zinc oxide varistor microsphere composites for efficient electric field grading

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