Improved method for selecting high-voltage circuit breaker in power transformation and distribution system

A technology for high-voltage circuit breakers and power distribution systems, which is applied to circuit breaker testing, instruments, and electrical measurement. It can solve the problems of traditional calculation methods, such as complicated calculation process and no clear quantitative calculation method, so that the calculation process is simple and clear. , high accuracy and accurate calculation results

Active Publication Date: 2017-12-22
鞍钢集团工程技术有限公司
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0034] The calculation process of the traditional calculation method is complicated, and the time constant T in the system is a The determination of

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
  • Improved method for selecting high-voltage circuit breaker in power transformation and distribution system
  • Improved method for selecting high-voltage circuit breaker in power transformation and distribution system
  • Improved method for selecting high-voltage circuit breaker in power transformation and distribution system

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[Specific embodiment]

[0203] The new 2030mm cold rolling production line project includes: a pickling-rolling mill combined unit, two continuous annealing units, an electro-galvanizing unit, a hot-dip galvanizing unit, a recoiling inspection unit, a recoiling splitting unit, and a semi-automatic packaging unit The unit and corresponding public auxiliary facilities form an annual production scale of 2.1 million tons.

[0204] Build a 110 / 10kV general step-down substation, 5 10kV main electrical rooms, namely: 110 / 10kV cold-rolled general step-down substation, continuous rolling main electrical room, pickling main electrical room, 1# continuous return line main Electric room, 2# continuous return line main electric room and Jinghuan pump station main electric room.

[0205] The voltage level of the total reduction substation is 110 / 10kV, with three 63MVA main transformers, the 110kV side is line transformer group and the 10kV side main connection type is single bus section.

[0206] ...

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

No PUM Login to view more

Abstract

The invention provides an improved method for selecting a high-voltage circuit breaker in a power transformation and distribution system, which summarizes a relationship between a periodic component and a direct current component of breaking short-circuit current and improves a calculation formula for the breaking capacity of the circuit breaker. Different from the traditional calculation method, the improved method respectively calculates the periodic component and the direct current component of the short-circuit current and then compares with breaking current of the circuit breaker so as to judge whether the breaking current of the circuit breaker can meet requirements or not. The time-periodic component relationship which is relatively simple and easy to search and calculate is found out by using a relational expression, a value range of a time constant in a power distribution system is deduced, and a calculation method is provided; and the breaking capacity of the circuit breaker is determined through comparing the breaking time. The improved method is simple and clear in calculation process, the original calculation data is easy to obtain, and the calculation result is accurate. Electrical equipment with a high performance-cost ratio can be accurately selected because the accuracy is substantially improved.

Description

technical field [0001] The invention relates to the technical field of medium and high voltage power distribution, in particular to an improved method for selecting a high voltage circuit breaker in a power transformation and distribution system. Background technique [0002] The selection of distribution circuit breakers, the breaking capacity of short-circuit current is one of the most important technical indicators. At present, the main selection methods are as follows: [0003] 1. The selection method given in the "Handbook of Electric Power Design for Iron and Steel Enterprises" is as follows: [0004] The circuit breaker of the power distribution system should be selected according to the breaking capacity to meet the requirements of the following formula: [0005] S dn ≥S" or I dn ≥I" [0006] In the formula, S dn ―The rated breaking capacity of the equipment, MVA; [0007] S"—short-circuit capacity at the fault location, MVA; [0008] I dn ―Rated breaking cu...

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): G01R31/327
CPCG01R31/3274
Inventor 郑伟李鹏巴月娥许伟宋刚季维鸿高贵军郑诗源富钢滕站
Owner 鞍钢集团工程技术有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap