Insulation Thickness Design Method for High Voltage XLPE DC Cable

A cross-linked polyethylene, DC cable technology, applied in the direction of conductor/cable insulation, insulator, circuit, etc., can solve the problem of different breakdown strength, meet the requirements of electrical performance, ensure long-term stable operation, and reliable transmission.

Active Publication Date: 2011-12-21
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] 2) The breakdown strength is different
Under the action of DC voltage, the problem of partial discharge is relatively less serious
[0032] Therefore, the structural dimensions of XLPE insulated DC cables are completely different from those of AC cables, and the structural dimensions of AC cables cannot be copied for DC cables.
Also, the insulation design method for AC cables is not applicable to DC cables

Method used

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  • Insulation Thickness Design Method for High Voltage XLPE DC Cable
  • Insulation Thickness Design Method for High Voltage XLPE DC Cable
  • Insulation Thickness Design Method for High Voltage XLPE DC Cable

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Embodiment Construction

[0071] The present invention will be described in more detail below in conjunction with specific embodiments.

[0072] Using the insulation thickness design method proposed by the present invention to design the insulation thickness of a 110kV single-core XLPE DC cable includes the following steps:

[0073] Step 1: Determine the form of the design voltage. When designing the insulation thickness of the HV XLPE DC cable, the designed voltage form is DC voltage U dc , Polarity reversal voltage U fz And DC voltage superimposed on transient overvoltage U pu ;

[0074] Step 2: Calculate the amplitude of the design voltage, DC voltage U dc The value is 110kV single-core XLPE DC cable long-term rated operating voltage U 0 , Is 110kV, namely U dc = U 0 =110kV, polarity reversal voltage U fz The value is 1.45U 0 , Which is U fz =1.45U 0 =160kV, and the transient overvoltage U is superimposed on the DC voltage pu The value is (1.1K+1.9) U 0 , Which is U pu =(1.1K+1.9)U 0 , K is the Badr c...

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Abstract

The invention relates to a design method for insulation thickness of a high-voltage cross-linked polyethylene direct current (DC) cable. The design method comprises the following steps of: determining the form of design voltage; calculating the amplitude of the design voltage; determining the form of design field intensity corresponding to the form of the voltage design; testing and calculating the amplitude of the design field intensity; and calculating and determining the design thickness of the high-voltage cross-linked polyethylene DC cable. For the high-voltage cross-linked polyethylene DC cable product designed by the design method for the insulation thickness, the cross-linked polyethylene insulation can withstand the action of long-term operating voltage of DC power transmission lines, power frequency alternating current (AC) voltage superimposed on the DC, voltage in a system, polarity inverse voltage produced through current reversal, operation impulse voltage produced through on/off actions and lightning impulse atmospheric over voltage, meets the requirements on electrical properties of cable insulation, ensures the long-term stable operation of the cable and realizes the reliable transmission of electric energy.

Description

Technical field [0001] The invention relates to a method for designing cable insulation thickness, in particular to a method for designing insulation thickness of a high-voltage cross-linked polyethylene DC cable. Background technique [0002] The insulation thickness design methods of high voltage AC cables include: [0003] 1) Maximum field strength method [0004] In the cable insulation layer, the maximum field strength appears on the surface of the core. If the breakdown strength of the insulating material is greater than the maximum field strength, the maximum field strength formula can be used to calculate the insulation thickness. The calculation formula is: [0005] E ∞ m = U r c ln R r c , Δ = R - r c [0006] Where E ∞ ——Theoretically, it is the breakdown strength value when the time tends to infinity. For oil-impregnated paper insulation, the partial discharge starting voltage can be used; for extrusion insulation, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/06H01B19/00
Inventor 刘英曹晓珑钟力生赵文明吴丽芳朱华英
Owner XI AN JIAOTONG UNIV
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