Supercharge Your Innovation With Domain-Expert AI Agents!

Alternating and direct current resistance ratio determination method of layered insulated conductor and current-carrying capacity evaluation method of layered insulated conductor cable

A technology of layered insulation and conductor cables, which is applied in the research of the current carrying capacity of power cables and the field of transmission lines, can solve the problems of reduced power transmission, increased transmission costs, and reduced power transmission efficiency of the power grid, so as to avoid losses and facilitate calculations.

Active Publication Date: 2019-03-08
STATE GRID ZHEJIANG ELECTRIC POWER +2
View PDF11 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the AC-DC resistance ratio can be obtained through the AC resistance test, the current test methods are not uniform, and the accuracy of the results needs to be verified
If the traditional measurement method is adopted, 1800mm 2 If the conductor is taken as an example, the AC resistance will be overestimated by 16%. At the same time, the AC and DC resistance ratio is the basic data for calculating the ampacity of the cable. Once it is inaccurate, it will be impossible to know the rated operating ampacity of the cable. The reduction of efficiency, the reduction of electric energy transmitted per unit time, resulting in waste of electric energy, the reduction of transmission economy and the increase of transmission cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Alternating and direct current resistance ratio determination method of layered insulated conductor and current-carrying capacity evaluation method of layered insulated conductor cable
  • Alternating and direct current resistance ratio determination method of layered insulated conductor and current-carrying capacity evaluation method of layered insulated conductor cable
  • Alternating and direct current resistance ratio determination method of layered insulated conductor and current-carrying capacity evaluation method of layered insulated conductor cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] This embodiment is a method for determining the AC / DC resistance ratio of a layered insulated conductor, including:

[0066] S1, S for obtaining multiple conductor samples r And k s Data, S r Is the ratio of radial DC conductance to axial DC conductance of the conductor, k s Is the correction factor of the conductor skin effect factor.

[0067] The conductor samples include a fully enameled wire monofilament stranded conductor and a bare copper monofilament stranded conductor. Since the layered insulated conductor is a twisted body of bare copper monofilament and enameled monofilament, the k of the layered insulated conductor s K with fully enameled monofilament stranded conductor and bare copper monofilament stranded conductor s The correlation between the two conductor samples is greater. r With k s The functional relationship of is also more able to fit the actual layered insulated conductor.

[0068] S of the conductor sample r The value is the actual test value, that is, ...

Embodiment 2

[0091] This embodiment is a method for evaluating the current carrying capacity of a layered insulated conductor cable based on the method for determining the AC / DC resistance ratio of the layered insulated conductor described in embodiment 1, including:

[0092] Using the method for determining the AC / DC resistance ratio of the layered insulated conductor in Example 1, determine the AC / DC resistance ratio of the layered insulated conductor;

[0093] Calculate the AC resistance of the layered insulated conductor cable based on the DC resistance of the layered insulated conductor and the determined AC / DC resistance ratio;

[0094] Calculate the power loss of the layered insulated conductor cable. The power loss includes dielectric loss, metal sheath loss factor and armor loss factor;

[0095] Calculate the thermal resistance of the layered insulated conductor cable. The thermal resistance includes the thermal resistance of the insulation, the thermal resistance of the inner lining or is...

Embodiment 3

[0105] In this embodiment, the methods of Embodiment 1 and Embodiment 2 are used to evaluate the current carrying capacity of the layered insulated conductor cable.

[0106] 1. Basic conditions

[0107] 1.1. Determine the structure size of the layered insulated conductor cable:

[0108]

[0109] 1.2. Determine the cable laying method, environmental conditions and operating conditions:

[0110] The cable runs in a three-phase AC system; the rated working voltage is 500kV; the maximum working temperature θ during operation c Is 90℃; the ambient temperature is the seabed soil temperature θ 0 It is 20℃; the depth of direct buried seabed l is 2500mm; the thermal resistance coefficient of seabed soil ρe is 0.7; the direct buried depth l'is 1000mm; the thermal resistance coefficient of land soil ρe' is 1.0; the cable laying distance is: in the sea Spacing S 1 Is 50000mm, the distance between shore soil is S 2 It is 10000mm.

[0111] 2. Calculation of AC and DC resistance ratio and AC resistan...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Conductor diameteraaaaaaaaaa
Insulation thicknessaaaaaaaaaa
Outer diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses an alternating and direct current resistance ratio determination method of a layered insulated conductor and a current-carrying capacity evaluation method of a layered insulated conductor cable. Through a study on the linear relation existing between Sr and k<s> of conductor samples with other structures, the k<s> value of a layered insulated conductor can be reversely calculated according to the measurable and calculable Sr of the layered insulated conductor, so that the alternating and direct current resistance ratio calculation of the layered insulated conductor andcurrent-carrying capacity evaluation can be realized. The determination method can be used for the alternating and direct current resistance ratio calculation of the layered insulated conductor, and is convenient and fast in calculation, so that theoretical bases can be provided for the optimization design and performance checking of the layered insulated conductor; and current-carrying capabilityevaluation can be performed on a layered insulated conductor cable, so that the accuracy of current-carrying capacity calculation results can be guaranteed, and power transmission costs brought by current-carrying capacity deviation during the application of the conductor can be reduced.

Description

Technical field [0001] The invention relates to the technical field of current carrying capacity research on transmission lines and power cables, in particular to a method for determining the AC / DC resistance ratio of a layered insulated conductor and a method for evaluating the current carrying capacity of a layered insulated conductor cable. Background technique [0002] Skin effect, also known as skin effect, refers to a phenomenon in which when alternating current passes through a conductor, the current distribution on the conductor section is uneven due to induction, and the closer the conductor is, the greater the current density. This phenomenon is called "skin effect". The skin effect increases the effective resistance of the conductor. When the low-frequency current flows through the thin wire, the skin effect can be ignored. However, the higher the frequency and the larger the conductor cross-section, the skin effect cannot be ignored. Especially at 800mm 2 The skin ef...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01R27/02G06F17/10
CPCG01R27/02G01R27/025G06F17/10
Inventor 江贞星杨黎明胡列翔王晓建朱智恩郑海王少华
Owner STATE GRID ZHEJIANG ELECTRIC POWER
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com