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Method for determining AC/DC resistance ratio of layered insulated conductor and evaluation method for ampacity of layered insulated conductor cable

A layered insulation and conductor cable technology, applied in the direction of high resistance measurement, resistance/reactance/impedance measurement, electrical variable measurement, etc., can solve the problems of reduced power transmission, increased transmission cost, and reduced power grid transmission efficiency. Achieve the effect of avoiding loss and convenient calculation

Active Publication Date: 2019-11-05
STATE GRID ZHEJIANG ELECTRIC POWER +2
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  • 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

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  • Method for determining AC/DC resistance ratio of layered insulated conductor and evaluation method for ampacity of layered insulated conductor cable
  • Method for determining AC/DC resistance ratio of layered insulated conductor and evaluation method for ampacity of layered insulated conductor cable
  • Method for determining AC/DC resistance ratio of layered insulated conductor and evaluation method for ampacity of layered insulated conductor cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0066] S1, to obtain S for multiple conductor samples r and k s data, S r is the ratio of the radial DC conductance of the conductor to the axial DC conductance, k s is the correction factor for the skin effect factor of the conductor.

[0067] The conductor samples include a fully enameled wire monofilament stranded conductor and a fully bare copper monofilament stranded conductor. Since the layered insulated conductor is a twisted body of bare copper monofilament and enamelled monofilament, the k of the layered insulated conductor s k with fully enamelled monofilament stranded conductors and fully bare copper monofilament stranded conductors s The correlation is relatively large, and the S obtained by using these two conductor samples r with k s The functional relationship of is also more able to fit the actual layered insulated conductor. ...

Embodiment 2

[0091] This embodiment is a method for evaluating the ampacity 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] Utilize the method for determining the AC-DC resistance ratio of the layered insulated conductor in embodiment 1, determine the AC-DC resistance ratio of the layered insulated conductor;

[0093] Calculation of the AC resistance of a layered insulated conductor cable based on the DC resistance of the layered insulated conductor and the determined AC to 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 layered insulated conductor cables, including thermal resistance of insulation, thermal resistance of inner lining or insulation sleeve, and thermal resistanc...

Embodiment 3

[0105] In this embodiment, the methods of Embodiment 1 and Embodiment 2 are used to evaluate the ampacity of the cable with layered insulated conductors.

[0106] 1. Basic conditions

[0107] 1.1. Determine the structural size of the layered insulated conductor cable as follows:

[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 during operation is θ c is 90°C; the ambient temperature is the seabed soil temperature θ 0 20°C; seabed direct burial depth l is 2500mm; seabed soil thermal resistance coefficient ρe is 0.7; land direct burial depth l' is 1000mm; land soil thermal resistance coefficient ρe' is 1.0; cable laying distance is: in the sea Spacing S 1 is 50000mm, the distance S between the shore soil 2 10000mm.

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

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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 research on the current-carrying capacity of 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] The skin effect, also known as the skin effect, refers to a phenomenon that when an alternating current passes through a conductor, the current distribution on the cross-section of the conductor is uneven due to induction, and the closer to the surface of the conductor, 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 a thin wire, the skin effect can be ignored, but the higher the frequency and the larger the conductor cross-section, the skin effect cannot be ig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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
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