Supercharge Your Innovation With Domain-Expert AI Agents!

Method for inhibiting induced current of power cable sheath

A technology for inductive current and power cables, applied in the direction of power cables, cable installation, cable installation devices, etc., can solve the problem of reducing the sheath current, not being able to play a good role in the protection of the sheath, and the metal sheath discharges to the ground And other issues

Inactive Publication Date: 2005-07-06
JIANGSU ELECTRIC POWER CO +1
View PDF1 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the principle point of view, the protector mainly performs overvoltage protection by releasing current, rather than reducing the sheath current, and in the current high-voltage cable operation, the protector is not very effective when the 220KV cable is put into operation. Good protection of the sheath, but still cause the metal sheath to discharge to the ground (the voltage is even as high as tens of thousands of volts)

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
  • Method for inhibiting induced current of power cable sheath
  • Method for inhibiting induced current of power cable sheath
  • Method for inhibiting induced current of power cable sheath

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0048] In the present embodiment, the substation adopts a single main variable capacity of 110kV transformer with a capacity of 50,000 kVA, the load current of each phase of the cable is about I=500A, the distance S=250mm between the cable central axes, and the average diameter of the cable sheath is D S=69.3mm, a three-phase loop is composed of three single-core cables, and the lines are laid in an equilateral triangle. Under balanced load conditions, U Sa , U Sb , U Sc The three-phase induced voltage is:

[0049] u Sa =U Sb =U Sc =U S =IX S =500×1.1247×10 -4 =0.0621(V / m)

[0050] where Xs according to the formula X S = 2 ω ( ln 2 S D S ) × 10 - 7 Ω / ...

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
lengthaaaaaaaaaa
Login to View More

Abstract

This invention relates to a method to use inductance to balance power cable protective layer inductance voltage and suppress the protective current, which belongs to electric engineer technique field and comprises the following steps: dividing three-phase cable into three sections with initial end three phases connected to the earth; crossing and exchanging the metal protective layer in middle part of the three-phase cable each section; computing inductance voltage on the metal layer according to the cable form and lay parameters and determining the compensation inductance to balance the voltage; connecting the compensation inductance to the third section of cable protective layer.

Description

technical field [0001] The invention relates to a method for suppressing the induced current of the sheath by using inductance to balance the induced voltage of the sheath caused by sections of unequal lengths of cables, and belongs to the technical field of electrical engineering. Background technique [0002] As we all know, power supply lines generally use power cables as power transmission networks. Due to the different needs of the transmission capacity, the design of the cables is also different. For lines with low transmission capacity, three-core cables are generally used; for lines with large transmission capacity requirements, single-core cables are generally used. [0003] The three cores of the three-core cable share the same metal sheath. When the three-phase current is basically balanced, the three-phase composite current is close to zero, and the composite magnetic flux is also close to zero. Therefore, there will be no induced voltage on the metal sheath. ....

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01B9/00H01C7/12H02G1/00
Inventor 王东海皇甫学政王春宁马宏忠
Owner JIANGSU ELECTRIC POWER CO
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