Distribution cable accessories are the key equipment of distribution network system, XLPE/SIR dielectric interface is the weak link of cable accessory insulation. In the work, the interface defect model of XLPE/SIR double-layer structure has been designed, and breakdown properties of double-layer structure with different defects have been studied. Further, the interface defect simulation model of double-layer structure and the cable joint defect are established. The experimental results show the breakdown strength of the specimens with double-layer structure decreases obviously after the defects are introduced, among which the breakdown strength of metal defects and semi-conductive defects are 41.37kV /mm and 43.66kV /mm respectively, which are decreased by 14.2 % and 9.5 % than the samples without defects. The simulation results show the electric field distortion caused by metal defects and semi-conductive defects in the double-layer structure are 44.6 kV /mm and 44.3 kV /mm respectively. The distortion caused by insulation defects is relatively small about 28.3kV/mm, which is consistent with the experimental law. The simulation of cable accessory interface defect shows that the maximum distorted electric field caused by metal defects and semiconducting defects appear at 3.5mm away from the three junction points of “XLPE-SIR-stress cone”, which is about 3.56 kV /mm; In contrast, the maximum electric field distortion caused by insulation defects occurred at the three junction points, which was about 7.23 kV/mm.

Interface defect breakdown property and electric field simulation of distribution cable accessories

The combined insulation interface of a high-voltage cable and accessories is the weakest part of a cable system. In this paper, the parameters of the dielectric constant, thermal conductivity, and elastic modulus of cross-linked polyethylene (XLPE) and silicone rubber (SIR) are obtained experimentally. On this basis, the model of a specific type of 110 kV cable and prefabricated insulation joint is established. A simulation of the electric–thermal–stress coupling field in the presence of typical defects in the main insulation–inner semi-conductive (SEMI) shielding layer (XLPE/SEMI interface) and the main insulation–silicone rubber insulation layer (XLPE/SIR interface) is studied. The simulation results show that at the XLPE/SIR interface, the electric field distortion caused by bubble defects reached 20.17 kV/mm, and the temperature rose to 56.15 °C. The effect of air-gap defects on the interface is similar to that of bubble defects. In addition, the semi-conductive impurity defects induced an increase in temperature to 56.82 °C and an increase in stress to 0.32 MPa. At the XLPE/SEMI interface, the electric field distortion induced by bubble defects was 19.98 kV/mm, and the temperature rose to 61.72 °C. The electric field distortion caused by metallic and semi-conductive defects was 8.44 kV/mm and 8.64 kV/mm, respectively. This study serves as a reference for the fault analysis and the operation and maintenance of cable accessories. 

Effect of Interface Defects on the Electric–Thermal–Stress Coupling Field Distribution of Cable Accessory Insulation

The middle joint of 10kV cable is a kind of cable accessory that needs to be installed outdoors. Poor conditions may cause defects in the joints during installation. Due to the small size of some defects, it is impossible to obtain accurate results when simulating them with all simulation domain together. In this paper, an accurate model is established to accurately calculate the distribution of electric field around particles in the whole model, and the error in the central region of the model is less than 6.5%. When there are metal particles on the main insulation surface of the cable, this accurate model is applied for analysis, and the maximum electric field intensity around the metal particles is calculated to be 7kV/mm, which is 3.8 times larger than normal.

https://iopscience.iop.org/article/10.1088/1757-899X/790/1/012133/pdf

Simulation of Electric Field Distribution in Cable Joint under the Influence of Metal Particle

https://robots.iopscience.iop.org/article/10.1088/1757-899X/790/1/012135/pdf

Transient Simulation Model for Electric Field Distribution in Cable Joint

The invention provides a tandem type alternating-current high-voltage bus measuring device. The measuring device comprises an incoming line connecting assembly, an outgoing line connecting assembly, ahigh-voltage conductor, a metal shell, a metal induction sheet and a measuring assembly. According to the invention, the incoming line connecting assembly and the outgoing line connecting assembly are respectively connected with an incoming line and an outgoing line of an AC high-voltage bus, the high-voltage conductor is connected in series in the alternating-current high-voltage bus, and the metal shell is grounded, so that the technical defect that the electrified replacement and offline calibration of a sensing part cannot be carried out when the metal shell in an existing slice type voltage measurement device is at a high potential is overcome, the electrified replacement and offline calibration of the sensing part (measurement resistor) are realized, and the measurement accuracy isimproved.

Tandem type alternating-current high-voltage bus measuring device and method

The invention discloses a cable elbow-shaped terminal transient voltage online monitoring device and method. The cable elbow-shaped terminal transient voltage online monitoring device comprises a pluginsulation structure, a thread structure arranged at one end of the plug insulation structure and a measurement transmission device arranged at the other end of the plug insulation structure. The measurement transmission device comprises an pre-embedded electrode, an adapter, a solid circular truncated cone and a measurement resistor; the pre-embedded electrode is of a structure similar to a circular truncated cone with a circular truncated cone-shaped hollow structure inside and an opening in the upper bottom surface; the side surface of the pre-embedded electrode is a convex arc and is grounded, and the lower bottom surface of the pre-embedded electrode is a convex arc; the solid circular truncated cone is arranged in the pre-embedded electrode; the solid circular truncated cone is isolated from the side surface of the pre-embedded electrode to form an isolation space; a through hole is formed in the lower bottom surface of the pre-embedded electrode corresponding to the isolation space; the through hole is filled with an insulating material; one end of the measuring resistor is connected with the lower bottom surface of one side of the through hole, and the other end of the measuring resistor is connected with the lower bottom surface of the other side of the through hole. According to the device and method of the invention, the voltage measurement accuracy of a cable elbow-shaped head can be improved.

Cable elbow-shaped terminal transient voltage online monitoring device and method

The electric field intensity (EFI) is important characteristic quantity for evaluating the internal insulation state of cable joints. Based on finite element method, this paper proposes two EFI research methods, field-circuit coupling method and equivalent circuit method. The average EFI of the inner surface of the outer semi-conducting shield can be calculated from the current in the measuring circuit. The relative error between these two methods is about 15%, which roughly proves the consistency of the two methods. Further practical application research enables online monitoring of cable joints.

Research on Simulation Methods of Electric Field Intensity on Surface of 10 kV Cable Joint

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