Analysis of DC Voltage Level and Ampacity of 66 kV AC XLPE Cable in DC Operation Under Constraint of Critical Inversion Temperature Difference

YANG Fan; FANG Zhankai; WANG Yang; LE Yanjie; YU Peng; LU Xu; YU Xiao

doi:10.13296/j.1001-1609.hva.2020.08.025

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Analysis of DC Voltage Level and Ampacity of 66 kV AC XLPE Cable in DC Operation Under Constraint of Critical Inversion Temperature Difference

更新时间：2025-04-26

- Analysis of DC Voltage Level and Ampacity of 66 kV AC XLPE Cable in DC Operation Under Constraint of Critical Inversion Temperature Difference
- High VoltageApparatus Vol. 56, Issue 8, Pages: 161-167(2020)
- 作者机构：
  
  1. 重庆大学输配电装备及系统安全与新技术国家重点实验室
  2. 国网浙江省电力公司舟山供电公司
  3. 深圳供电局有限公司
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2020.08.025
  CLC： TM721.1
- Published：2020
- 稿件说明：
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[1]杨帆,房占凯,汪洋,乐彦杰,余鹏,卢旭,余晓.临界反转温差约束下66 kV交流XLPE电缆改为直流运行的电压等级和载流量分析[J].高压电器,2020,56(08):161-167.

YANG Fan, FANG Zhankai, WANG Yang, et al. Analysis of DC Voltage Level and Ampacity of 66 kV AC XLPE Cable in DC Operation Under Constraint of Critical Inversion Temperature Difference[J]. High voltageapparatus, 2020, 56(8): 161-167.
[1]杨帆,房占凯,汪洋,乐彦杰,余鹏,卢旭,余晓.临界反转温差约束下66 kV交流XLPE电缆改为直流运行的电压等级和载流量分析[J].高压电器,2020,56(08):161-167. DOI： 10.13296/j.1001-1609.hva.2020.08.025.

YANG Fan, FANG Zhankai, WANG Yang, et al. Analysis of DC Voltage Level and Ampacity of 66 kV AC XLPE Cable in DC Operation Under Constraint of Critical Inversion Temperature Difference[J]. High voltageapparatus, 2020, 56(8): 161-167. DOI： 10.13296/j.1001-1609.hva.2020.08.025.

摘要

准确有效地评估交流电缆改为直流运行时的增容效果对电缆交改直后的安全运行至关重要。现有研究主要基于缆芯温度70℃为阈值确定交改直的电压等级和载流量

并未考虑绝缘层的稳态电场强度。因此

文中综合考虑临界反转时稳态电场强度较小和温升限值约束

提出了以绝缘层中的电场强度5 MV/m为限值的交改直电压等级和载流量判定方法;并且以66 kV交流XLPE电缆为例进行仿真计算

分析了直埋土壤敷设下交流电缆改为单极直流和双极直流运行时的增容效果。研究结果表明:当电缆在直埋土壤敷设下以66 kV单极直流运行和双极直流运行时

最大输送功率分别为改造前的1.53倍和1.12倍。所采用的分析方法可为电缆线路交改直工程提供一定的参考。

Abstract

Accurately determining DC voltage level and ampacity of AC cable is vital for safety of AC-DC conversion. The current researches mainly determine the voltage level and ampacity based on the threshold value of core temperature 70 ℃

but does not consider the steady electric field strength of the insulating layer. In this paper

a method for judging the DC voltage level and ampacity with the electric field strength limitation of 5 MV/m in insulation layer is proposed under the constraint of small steady-state electric field strength and temperature rise limit in critical reversal. In addition

taking the 66 kV AC XLPE cable for example

the compatibilization effect of applying the AC cable to unipolar DC or bipolar DC operation is analyzed. Calculation results show that when the 66 kV cable laid in soil operates in unipolar DC mode and bipolar DC mode

the maximum transmission power is 1.53 times and1.12 times of the original value before the transformation

respectively. This analysis method may serve as a referenceforAC-DCconversionofcableline.

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