Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for measuring system voltage and current angles without voltage transformer

A voltage transformer, current technology, applied in the phase angle between voltage and current, measuring electricity, measuring electrical variables and other directions, can solve problems such as no power measurement

Inactive Publication Date: 2014-10-08
STATE GRID CORP OF CHINA +3
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for measuring voltage and current angles without voltage transformers. The phase angle between voltage and current must be used in metering, monitoring, and automatic control in power systems. Power measurement, monitoring issues in systems where voltage transformers are installed

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 measuring system voltage and current angles without voltage transformer
  • Method for measuring system voltage and current angles without voltage transformer
  • Method for measuring system voltage and current angles without voltage transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail: a kind of method for measuring voltage, current angle without voltage transformer, it is characterized in that concrete steps are as follows: collect busbar voltage in substation, at first adopt to system need The time of each receiving point of the voltage angle is uniformly calibrated to ensure that the time of the entire system (that is, the sampling point and the receiving point) is highly consistent. At the same time, the time is recorded at the zero-crossing point of the voltage waveform. After receiving this zero-crossing point, the receiving point collects with itself Comparing the current waveform zero-crossing time, the time difference obtained can be converted to the angle between them, and the conversion formula is Φ = t *360o / T .

[0021] The voltage and current generated by the generator in the power system change positively (the standard...

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 relates to a method for measuring system voltage and current angles without a voltage transformer. The method is characterized in that when bus voltage is acquired in a power substation and receiving points of voltage angles required by a system are firstly corrected in a unified mode, the time of the whole system (namely sampling points and receiving points) is kept consistent highly, meanwhile zero crossing point moments of voltage waveforms are recorded, the receiving points receive the zero crossing point moments, and the zero crossing point moments are compared with the acquired current waveform zero crossing moments to obtain a time difference value, voltage-current included angles can be converted according to a reduction formula phi = t*360 degrees / T. Voltage and current produced by a power system generator change with sine (standard frequency of a power system in our country f = 50Hz, change occurs for 50 times per second), three-phase current and voltage are symmetric in space and time, the mutual deviation is 120 degrees, one period is 360 degrees according to sinusoidal variation, and each period is shown in description. The problem of power measurement and monitoring of a system which is not provided with the voltage transformer or on which the voltage transformer cannot be installed is solved by adopting the method.

Description

technical field [0001] The invention relates to a method for measuring voltage and current angles without a voltage transformer, and belongs to the field of on-line monitoring and monitoring. Background technique [0002] In the power system, measuring the phase angle of current and voltage is a necessary technology for metering, monitoring, and automatic control. For example, power measurement monitoring, reactive power compensation control, and online monitoring of arresters must measure the angle between current and voltage to calculate. . However, the current measurement depends on the installation of voltage transformers to measure the voltage. It is unrealistic to install a large number of voltage transformers for one kind of monitoring only in radial and short-circuit distribution networks, and some local conditions do not allow the installation of voltage transformers, which makes monitoring impossible. Therefore, the technology of measuring the current and voltage...

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): G01R25/00G01R31/00
Inventor 张喜林李国庆庞丹王振浩韩晓娟辛业春张斌张丹
Owner STATE GRID CORP OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com