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Establishment method of cable accessory operation model

A technology for cable accessories and building methods, applied in electrical digital data processing, instrumentation, design optimization/simulation, etc., can solve problems such as lack of accuracy and representativeness, and achieve high accuracy and representativeness.

Pending Publication Date: 2022-08-02
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

The cable accessory operation model is an important reference for cable accessory design, material selection and performance research. It is widely used in the calculation and simulation of multiple physical fields such as composite interface pressure, electric field, and temperature field. It has important guiding significance for cable line operation. However, Existing operating models of cable accessories lack accuracy and representativeness

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  • Establishment method of cable accessory operation model
  • Establishment method of cable accessory operation model
  • Establishment method of cable accessory operation model

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Embodiment 1

[0069] Based on the AC electric field of the cable accessories in the operating state of the XLPE distribution network cable, the establishment of the operating model of the cable accessories includes the following steps:

[0070] (1) Select a commercial type of cold-shrinkable cable accessories, and the main insulation is silicone rubber material;

[0071] (2) Measure the structural parameters of the cable accessories in the natural state and working state, where d 1 =17.5mm, d 2 =45.5mm, D 1 = 27mm, D 2 =49mm, the tensile ratio of the innermost and outermost layers is calculated, β 1 =54.3%, β 2 =7.7%;

[0072] (3) In [β 2 ,β 1 ] In the interval, select 5 elongation ratio values ​​(7.7%, 19.35%, 31%, 42.65%, 54.3%), and stretch the cable accessories (silicon rubber test pieces) to the selected elongation ratio respectively. The testing equipment tests the dielectric constant of the material at different elongation rates at 25 and ℃. Based on the dielectric constant v...

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Abstract

The invention discloses a method for establishing a cable accessory operation model, and the method comprises the following steps: S1, determining the stretching rate beta1 of an inner layer of a cable accessory and the stretching rate beta2 of an outer layer of the cable accessory, beta 2; s2, respectively determining an inner layer temperature T1 and an outer layer temperature T2 when the cable accessory operates, taking T1 and T2 as boundary conditions, and calculating to obtain a temperature distribution condition in the radial direction of the cable accessory; wherein T < 1gt >; t2; s3, obtaining an electrical parameter-stretch rate relation of the electrical parameter in an interval of [beta2, beta1]; s4, obtaining an electrical parameter-temperature relation of the electrical parameter in the interval of [T2, T1]; and S5, according to the data obtained in the steps S1, S2, S3 and S4, setting different radial positions in the cable accessory as corresponding electrical parameters, and establishing a cable accessory operation model. The method can be used for calculation and simulation of the multi-physical field of the cable accessory, and has higher accuracy and representativeness compared with a previous model.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a method for establishing an operation model of a cable accessory. Background technique [0002] Cross-linked polyethylene (XLPE) cables have been widely used in power systems due to their stable insulation performance, simple structure and process, and small footprint. They are the neural network of power transmission and distribution systems. XLPE cables include cable cores (ie conductors), XLPE main insulators wrapped outside the cable cores, and cable accessories wrapped outside the XLPE main insulators. The post-shrinkage on the XLPE main insulator generates interfacial pressure, thereby forming a close-contact composite interface. The operation model of cable accessories is an important reference for the design, material selection and performance research of cable accessories. It is widely used in the calculation and simulation of multi-physics fields such as composite inte...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F113/16G06F119/08
CPCG06F30/23G06F2113/16G06F2119/08Y02E60/00
Inventor 胡昊贾志东王希林
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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