High-Voltage Cable Insulation Structure for Thermal Impulse Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-voltage power cables experience significant degradation in insulating properties due to increased temperature of the cable insulator or negative impulse/polarity reversal, leading to dielectric breakdown and reduced dielectric strength.
Innovation Solution
A high-voltage power cable design featuring an insulation layer with precisely controlled crystallinity, where the difference between the highest and lowest crystallinity layers is 10% or less, using crosslinked polyethylene (XLPE) or non-crosslinked polypropylene (PP) as base resins, and incorporating multiple semiconducting layers for enhanced electric field distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation layers are used in high-voltage power cables, then the cable can transmit power, but the insulating properties degrade significantly when temperature increases or negative impulse/polarity reversal occurs
Solution Approach 1:
The insulation layer is divided into three distinct layers (inner, intermediate, outer) with different crystallinity ranges. The inner layer has crystallinity of 30-40%, the intermediate layer has 35-45%, and the outer layer has 40-50%. This local differentiation of crystallinity provides optimized performance for each layer's specific functional requirements while collectively enhancing overall dielectric strength and thermal stability.
Solution Approach 2:
The patent uses a composite structure of polyolefin resin (95-99.9 wt%) combined with specific additives (0.1-5 wt% crosslinking agents, antioxidants, and other functional additives). This composite material approach creates an insulation layer that maintains excellent dielectric properties while resisting degradation from temperature increases and electrical impulses.
2Strength
If the insulation layer structure is simplified, then manufacturing is easier, but dielectric strength and breakdown voltage performance deteriorate
Solution Approach 1:
The insulation layer is divided into three distinct layers (inner, intermediate, outer) with different crystallinity ranges. The inner layer has crystallinity of 30-40%, the intermediate layer has 35-45%, and the outer layer has 40-50%. This local differentiation of crystallinity provides optimized performance for each layer's specific functional requirements while collectively enhancing overall dielectric strength and thermal stability.
Solution Approach 2:
The patent systematically varies the crystallinity parameter across different layers of the insulation structure. By controlling crystallinity within specific ranges for each layer (inner: 30-40%, intermediate: 35-45%, outer: 40-50%), the design optimizes the balance between dielectric strength, breakdown voltage resistance, and manufacturing feasibility.
3Reliability
If uniform crystallinity is maintained throughout the insulation layer, then manufacturing precision is easier to achieve, but dielectric characteristics cannot be optimized for different operational conditions
Solution Approach 1:
The insulation layer is divided into three distinct layers (inner, intermediate, outer) with different crystallinity ranges. The inner layer has crystallinity of 30-40%, the intermediate layer has 35-45%, and the outer layer has 40-50%. This local differentiation of crystallinity provides optimized performance for each layer's specific functional requirements while collectively enhancing overall dielectric strength and thermal stability.
Solution Approach 2:
The patent systematically varies the crystallinity parameter across different layers of the insulation structure. By controlling crystallinity within specific ranges for each layer (inner: 30-40%, intermediate: 35-45%, outer: 40-50%), the design optimizes the balance between dielectric strength, breakdown voltage resistance, and manufacturing feasibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cable maintains excellent dielectric strength, including dielectric breakdown voltage and impulse breakdown strength, even under conditions of increased temperature or negative impulse/polarity reversal, ensuring stable insulation characteristics.
Implementation Method 1
when the insulating layer is divided into three equal parts to obtain an inner layer, an intermediate layer, and an outer layer according to a thickness, the difference in crystallinity between a layer with highest crystallinity and a layer with lowest crystallinity is 10% or less
Data Source
AI summary
Provided is a high-voltage power cable. Specifically, the present disclosure relates to a high-voltage power cable that exhibits excellent dielectric strength, such as dielectric breakdown voltage and impulse breakdown strength, and that is capable of implementing and maintaining dielectric characteristics even when a temperature of a cable insulator rises due to the transmission of power or when negative impulse or polarity reversal occurs.