Long cable withstand voltage test wire core voltage analytical calculation method
A technology of withstand voltage test and calculation method, which is applied in complex mathematical operations and other directions, and can solve problems such as inconsistent voltage distribution of long cable cores
Pending Publication Date: 2019-07-23
HOHAI UNIV
View PDF4 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, the cable equivalent circuit model is mostly based on the two-port circuit model adopted by the transmission line equation, ignoring the influence of the cable sheath, but when calculating the voltage of the long-distance cable core, the cable sheath and the cable core have a strong coupling effect , if the cable sheath is ignored, the calculated long cable core voltage distribution does not match the actual situation
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0018] This embodiment provides an analytical calculation method for the core voltage of a long cable withstand voltage test. The method includes:
[0019] Step 1: Construct Kirchhoff's equations
[0020] According to reference figure 1 The distributed parameter equivalent circuit of the cable sheath and the cable core, lists the Kirchhoff equations including the KVL equation and the KCL equation, and the cable sheath is a metal sheath made of a metal material; figure 1 Δx is the length of one microelement of the cable, ΔU 1x is the difference between the voltage at the end of the wire core and the voltage at the head end under the microelement length Δx, ΔU 2x is the voltage difference betw...
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
Login to View More Abstract
The invention discloses a long cable withstand voltage test wire core voltage analytical calculation method. The method is based on an equivalent circuit model considering a cable sheath, a Kirchhoffequation set is list; Laplace transformation on a Kirchhoff equation set is carried out, a single-phase cable transmission model is established, cable withstand voltage test boundary conditions are substituted into the single-phase cable transmission model, a formula for calculating the voltage to ground of a cable core is obtained, and the voltage to ground of the cable core is obtained by substituting cable material parameters and structure parameters; the method is simple, the voltage to ground of the cable core can be obtained without on-site measurement, the potential risk of cable insulation layer breakdown caused by overhigh voltage to ground of the core in a withstand voltage test is effectively avoided, and technical guidance is provided for design personnel of a cable withstand voltage test scheme.
Description
technical field [0001] The invention relates to an analytical calculation method for core voltage of a long cable withstand voltage test, which belongs to the technical field of transmission line testing. Background technique [0002] During the AC withstand voltage test of long-distance cables, due to the capacity rise phenomenon, the voltage along the wire core increases, and the increased value will threaten the main insulation of the cable and hinder the cable withstand voltage test. At present, the cable equivalent circuit model is mostly based on the two-port circuit model adopted by the transmission line equation, ignoring the influence of the cable sheath, but when calculating the voltage of the long-distance cable core, the cable sheath and the cable core have a strong coupling effect , if the cable sheath is ignored, the calculated long cable core voltage distribution does not match the actual situation. Therefore, there is a need for a method for obtaining the vo...
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
Login to View More IPC IPC(8): G06F17/11
CPCG06F17/11Y02E60/00
Inventor 潘文霞孙凯谢晨李烨
Owner HOHAI UNIV