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

Error test system and method for digitized metering device

A technology of measuring devices and testing systems, applied in measuring devices, measuring electrical variables, instruments, etc., can solve the problems of inability to provide two-way branch current and current output, clock inaccuracy, digital metering device error out-of-tolerance error stability, etc. question

Active Publication Date: 2014-05-14
STATE GRID CORP OF CHINA +1
View PDF6 Cites 40 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantage is that it does not solve the problem of traceability of the individual error test of the electronic transformer and digital energy meter to a higher level of standard value.
[0008] To sum up, the shortcomings of the existing error testing methods and testing systems for digital metering devices are: 1) the existing method cannot change the unique error influence quantity of the digital metering device to test the error of the digital metering device; for the digital metering device, due to The measurement of voltage and current is realized through multi-channel dispersed independent sampling and optical fiber digital message transmission. Compared with traditional metering devices, new error sources are added, such as electronic transformer data sampling delay and merging unit data processing transmission delay. , message packet loss, message code error, message jitter, voltage and current harmonics, clock asynchrony, clock inaccuracy, etc., resulting in problems such as error out-of-tolerance and poor error stability of the digital metering device during field operation. The evolution mechanism of the error of the digital metering device under working conditions is not yet clear, but due to the lack of effective testing and analysis methods for the amount of error influence, the problems in the field operation cannot be solved
[0009] 2) The existing method cannot test the error of the digital metering device in the wiring mode of one and a half circuit breakers; the existing method is only suitable for the error in the digital metering device of the substation with the main wiring mode of the primary system such as double busbar and single busbar. It consists of a set of voltage transformers (including ABC three-phase), a set of current transformers (including ABC three-phase), a three-phase digital energy meter and related equipment in one interval
The existing error test method only provides a set of current outputs, and cannot and cannot provide the sum current output representing the two-way branch current, nor does it provide a digital signal representing the two-way branch current, so the existing method is not suitable for one and a half Error Test of Digital Electric Energy Metering Device in Circuit Breaker Wiring Mode

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
  • Error test system and method for digitized metering device
  • Error test system and method for digitized metering device
  • Error test system and method for digitized metering device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] Below in conjunction with specific embodiment the present invention is described in further detail, described is the explanation of the present invention rather than limitation, and wherein said tradition all refers to the prior art that utilizes analog quantity during work, is opposite to digital quantity.

[0046] The error testing system of the digital metering device of the present invention includes a digital metering device, a standard traditional current transformer, a three-phase electronic transformer calibrator, a three-phase standard digital electric energy meter, a three-phase standard traditional electric energy meter and a load for outputting electric energy The three-phase test power supply; the digital metering device includes a standard clock source for providing a standard clock synchronization signal, two sets of three-phase current transformers and a current merging unit for digitizing the current analog output of the three-phase test power supply. , ...

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 error test system and method for a digitized metering device. The error test system and method can meet requirements for whole error test and dissemination of the value of quantity of the digitized metering device in a semi-breaker wiring mode, and can simultaneously test and compare the whole error and the sum of a single error of an electronic transformer and a single error of a digitized electric energy meter by changing characteristic error influence quantity of the digitized metering device. The test system comprises the digitized metering device, a traditional standard current transformer, a three-phase electronic transformer calibrator, a three-phase standard digitized electric energy meter, a traditional three-phase standard electric energy meter and a three-phase test power supply used for outputting an electric load; the test method based on the test system compares and analyzes the whole error and the sum of single errors of dissemination of the value of the quantity in the digitized metering device by independently testing the whole error, the error of the electronic transformer and the error of the tested three-phase digitized electric energy meter, specific sources of the errors are determined, and operation and regulation are conducted according to actual working conditions.

Description

technical field [0001] The invention relates to the field of error testing of digital metering devices, in particular to an error testing system and testing method of digital metering devices. Background technique [0002] The digital metering device or digital metering system in a smart substation or a digital substation is composed of an electronic transformer including an electronic voltage transformer and an electronic current transformer and a combined unit of digital input (or a traditional voltage transformer and a traditional current transformer. Combination unit of transformer and analog input), switch, digital energy meter, clock synchronization system and optical fiber. Electronic transformers generally digitize the current and voltage signals on the high-voltage side, and then transmit the digitized current and voltage information to the merging unit through optical fiber. The merging unit complies with IEC60044, IEC61850-9-1, IEC61850-9-2 / LE, etc. The standard ...

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): G01R35/04
Inventor 宋晓林寇喆贺鸿祺
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