This paper focuses on the multi-dimensional performance analysis including oxidation performance, crystal morphology, thermal properties, mechanical properties and dielectric behavior of thermally aged extra high voltage XLPE submarine cable insulation. Results show that antioxidation oxidative aging insulation are coexisting competing during degradation process. In early stage degradation, is dominant resulting in decline spacing between spherulites. later dominant, which leads to damage...

This paper focuses on the in-depth analysis of physical mechanism broadband frequency domain spectroscopy oil-paper insulation. The complex permittivity shows two low-frequency dispersion phenomena, and real part conductivity exhibits slope changes under synergistic effect aging moisture. are mainly attributed to migration characteristics water molecules polar products with a degradation insulation, resulting in transition dependence between DC AC conductivity. When insulation deteriorates...

Carrying out the insulation condition measurement and analysis is important for safe operation of submarine cable. In this study, high‐voltage frequency dielectric response used to identify ageing state AC 500 kV cross‐linked polyethylene (XLPE) The complex capacitance tan δ in low‐frequency area new, thermal ageing, electro‐thermal cable all increase with testing voltage increased from 200 2000 V. It founded that at high more likely detect differences. Based on carbonyl index loss XLPE...

In order to ensure the safe operation of submarine cables, it is great significance analyse insulation state cables from perspectives microstructure, carrier transport characteristics and macroscopic dielectric properties. this study, based on high-voltage frequency domain spectroscopy (HV-FDS) measurement system, HV-FDS experiments fresh thermally aged were carried out under continuous (0.5, 2, 4 10 kV) cyclic (2-10-2 applied alternating voltages. Then, combining changes microstructure...

Diagnosing insulation intrinsic ageing is essential for preventing failure of submarine cables, and in case failure, helping any decision about maintenance actions. In this study, a novel aged cable diagnosis approach based on high-voltage frequency domain spectroscopy (HV-FDS) with broader width proposed to analyse the high-field polarisation characteristics conductivity behaviour 500 kV polymeric cables insulation, aiming support evaluation overall ageing. The measurement principle HV-FDS...

Abstract As a type of 2D materials, layered double hydroxides (LDHs) have emerged as potential candidates for electrochemical energy storage materials. To address their challenges limited active sites and sluggish charge transfer kinetics, etc., this work presents an ingenious synchronous topochemical pathway (STP) method that enables the in situ anchoring numerous nanosized Co 9 S 8 on rigid layers LDHs. These n‐type anti‐barrier layers, generated by ohmic contact between quasi‐metal (Co )...

This paper proposes an online calibration method for the junction temperature estimation of power semiconductor devices in Electric Vehicle (EV) traction applications utilizing thermo-sensitive electrical parameters (TSEPs). It is achieved through DC-link discharging operation mode inverter after vehicle parked, which a natural and frequent activity EV applications. Compared to conventional schemes, proposed can be conveniently accomplished short term without need long-term data recording or...

With the rapid rise of new energy industry and its development all over world, there is a great market for submarine cable products. The world's first class AC 500kV cross-linked polyethylene (XLPE) insulated will soon be put into operation in "Zhoushan-Ningbo" interconnection project. Aging insulation materials after an important factor restricting safe XLPE cable. Taking consideration that frequency domain spectroscopy (FDS) nondestructive testing (NDT) method, this paper, changes...

Solar PV panels are the center equipment of photovoltaic power systems. Condition monitoring is key technique to predicting health status and increasing availability panels. This paper proposes Feature Fingerprint Intervals (FFI) method monitor degradation conditions The proposed approach sensitive mechanisms prediction indicator, amplitude impedance spectroscopy, at FFI will be acquired directly from spectroscopy while performing online can predicted based on variation values compared with...

Epoxy (EP) resins find widespread application in power electronics (PE) applications characterized by multi-frequency electrical stresses. Transient thermal overloads are also not uncommon due to, for example, short circuits the external circuit. This article investigates influence of various temperatures on broadband dielectric properties EP insulation, above and below glass transition temperature ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML"...