CN104280609A - Ultra-wide-range impact load electric energy meter - Google Patents
Ultra-wide-range impact load electric energy meter Download PDFInfo
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- CN104280609A CN104280609A CN201410557534.4A CN201410557534A CN104280609A CN 104280609 A CN104280609 A CN 104280609A CN 201410557534 A CN201410557534 A CN 201410557534A CN 104280609 A CN104280609 A CN 104280609A
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Abstract
The invention discloses an ultra-wide-range impact load electric energy meter, and belongs to the technical field of electric energy measurement. The energy meter is composed of an A-phase multirange input module, a B-phase multirange input module, a C-phase multirange input module, an analog-digital converter (ADC), a digital signal processor (DSP) and an electric energy data output module. According to the electric energy meter, the 0.5s level or the 0.2s level of nominal accuracy within 0.05In to 360In can be achieved. The electric energy meter can measure high-precision large current and small current as well.
Description
Technical field
The invention belongs to Electric Energy Metering Technology field, be specifically related to range impact load electric energy meter.
Background technology
Impact load refers to the load (as electric arc furnaces, rolling mill etc.) of load current wide variation, and the peak value of dash current may be several times or the decades of times of average load electric current.
Common people compare the nominal accuracy paying close attention to electric energy meter, not too pay close attention to the range of electric energy meter.In fact, the nominal accuracy of electric energy meter only exists
just can be guaranteed in scope,
the maximum current (effective value) that electric energy meter ensures nominal accuracy,
be the minimum current (effective value) that electric energy meter ensures nominal accuracy, electric energy meter also has an important parameter---fundamental current
(effective value), fundamental current is the most groundwork electric current of calibration electrical energy meter accuracy.
Electric energy meter national regulations: generally
n is called overload magnification, the overload magnification of conventional electric energy meter is 4 times, 6 times, and overload magnification reaches 8 times, 10 times and just belongs to wide magnitude electrical energy meter, overload magnification accomplish 10 times more than just more difficult---be difficult to get both because of Super-Current Measurement precision and small current measurement precision.
The meeting had due to the current peak of impact load exceeds
, so conventional electric energy meter metering impact load electric energy is inaccurate, and even “ Lost loses sometimes " and impact load electric energy.
State Grid Corporation of China's " intelligent electric energy meter pattern specification interpretation of section " explicitly points out: wide-range, high reliability are development trends of electric energy meter, and the overload magnification of electric energy meter is higher, its can the load range of satisfy hierarchy index accurate-metering wider.In addition, if the load growth of user from now on, the workload changing electric energy meter can be reduced.
Summary of the invention
The present invention proposes a kind of super-wide range impact load electric energy meter, and its overload magnification can reach 360 times, namely exists
in scope, the nominal accuracy of electric energy meter can accomplish 0.5s level, even 0.2s level.
The present invention is made up of A, B, C phase multirange load module, analog to digital converter ADC, digital signal processor DSP, energy data output module;
Each phase multirange load module comprises voltage transformer pt respectively
x, the first Current Transmit
x1 and second Current Transmit
x2, voltage signal conditioning link, the first current signal conditioning link and the second current signal conditioning link;
The voltage transformer pt of each phase multirange load module
xby the voltage signal of corresponding phase
be transformed to low voltage signal
and by low voltage signal
deliver to voltage signal conditioning link, the first Current Transmit of each phase multirange load module
x1 presses ER effect ratio
by the current signal of corresponding phase
be transformed to the first low current signal
and by the first low current signal
deliver to the first current signal conditioning link, the second Current Transmit
x2 press ER effect ratio
by the current signal of corresponding phase
be transformed to the second low current signal
and by the second low current signal
deliver to the second current signal conditioning link, above-mentioned
k i2<
k i1;
The voltage signal conditioning link of the multirange load module of every phase, the first current signal nurse one's health link and the second current signal nurses one's health link respectively by the low voltage signal after adjustment
, the first low current signal
with the second low current signal
low voltage digital signal is converted to through analog to digital converter ADC
, the first low current digital signal
with the second low current digital signal
;
Low voltage digital signal
, the first low current digital signal
with the second low current digital signal
through digital signal processor DSP to every low voltage digital signal
, the first low current digital signal
with the second low current digital signal
carry out digital integration obtain three-phase electric energy data and three-phase electric energy data are delivered to energy data output module;
The formula that described digital signal processor DSP carries out digital integration is:
In above formula,
the time of individual computation period,
the no-load voltage ratio constant of voltage input element,
the no-load voltage ratio of individual computation period electric current input element,
calculate corresponding phase active energy phase current digital signal used;
Described digital signal processor DSP includes a current channel autoselector,
individual computation period, the selection principle of current channel autoselector is:
Wherein,
with
that digital signal processor DSP is respectively
individual computation period calculates the electric energy of corresponding phase current digital amount used and ER effect ratio,
with
that analog to digital converter ADC carries out linear analog-to-digital positive maximum number amount and negative lowest numeric amount respectively.
The energy data way of output of energy data output module of the present invention can have three kinds: show on the panel of display, meritorious test pulse, idle test pulse, data to be exported by communication interface.
The calculating of active energy and reactive energy, show, upload, the conventional method of calibrating do not repeat herein again, special character of the present invention is:
Every phase current signal
input path has two, and one is conventional path---through the first Current Transmit
x1 presses ER effect ratio
deliver to ADC and be converted into current digital amount
, one is impact path---through the second Current Transmit
x2 press ER effect ratio
deliver to ADC and be converted into current digital amount
,
.
If the fundamental current that conventional path is corresponding is
, maximum current is
, minimum current is
, overload magnification is n
1; The fundamental current impacting path corresponding is
, maximum current is
, minimum current is
, overload magnification is n
2.
Like this, key one-tenth of the present invention is: how to determine conventional path
,
,
,
, how to determine to impact path
,
,
,
, when DSP calculates electric energy, how to switch this two paths.
If analog to digital converter ADC at the corresponding digital quantity of linear analog-to-digital scope is
,
with
be the linear analog-to-digital positive maximum number amount of analog to digital converter ADC and negative lowest numeric amount respectively, generally get in electric energy meter
.If digital quantity
the analog voltage of corresponding A DC input end
, so determine ER effect ratio
principle be exactly:
（1）
Wherein,
it is current wave factor.
ER effect ratio
eR effect ratio just can be determined after determining
, determine
principle be exactly:
（2）
Here
.
Digital signal processor DSP includes the automatic selection mechanism of current channel, at the n-th computation period---and the selection principle of this selection mechanism is:
（3）
（4）
Wherein,
with
that digital signal processor DSP is respectively
individual computation period calculates the electric energy (digital integration) of corresponding phase current digital amount used and ER effect ratio,
with
that analog to digital converter ADC carries out linear analog-to-digital positive maximum number amount and negative lowest numeric amount respectively.
Formula (1) means to (4): work as current signal
be less than
time calculate the data of electric energy conventional path, work as current signal
be more than or equal to
time calculate electric energy with impacting the data in path.
Get
, obviously, the range ability in conventional path and impact path exists
cover continuously in scope.
In sum, the index of whole super-wide range impact load electric energy meter is: fundamental current
, minimum current
, maximum current
, that is,
in scope, the nominal accuracy of electric energy meter can be guaranteed.
Be not difficult to find out, the present invention can be regarded as two overload magnifications is that the electric energy meter " slitless connection " of 6 times forms, and each 6 times of electric energy meters will accomplish that 0.5s level or 0.2s level have been mature technologies, so the present invention exists
in scope, nominal accuracy accomplishes that 05s level or 0.2s level are unchallenged, and namely the present invention can measure high-precision big current and small area analysis equally.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Embodiment
As shown in Figure 1, the present invention is made up of A, B, C three-phase multirange load module 1, analog to digital converter ADC 2, digital signal processor DSP 3 and energy data output module 4.
Digital signal processor DSP includes a current channel autoselector, and at the computation period, the selection principle of current channel autoselector is:
Wherein,
with
that digital signal processor DSP is respectively
individual computation period calculates the electric energy (digital integration) of corresponding phase current digital amount used and ER effect ratio,
with
that analog to digital converter ADC carries out linear analog-to-digital positive maximum number amount and negative lowest numeric amount respectively.
Each phase multirange load module 1 comprises voltage transformer pt respectively
x11, the first Current Transmit
x1 12 and second Current Transmit
x2 13, voltage signal conditioning link 14, first current signal conditioning link 15 and the second current signal conditioning link 16.
The voltage transformer pt of each phase multirange load module 1
x11 by the voltage signal of corresponding phase
be transformed to low voltage signal
and by low voltage signal
deliver to voltage signal conditioning link 14, the first Current Transmit of each phase multirange load module 1
x1 12 press ER effect ratio
by the current signal of corresponding phase
be transformed to the first low current signal
and by the first low current signal
deliver to the first current signal conditioning link 15, second Current Transmit
x2 13 press ER effect ratio
by the current signal of corresponding phase
be transformed to the second low current signal
and by the second low current signal
deliver to the second current signal conditioning link 16, and above-mentioned
k i2<
k i1.
Voltage signal conditioning link 14, the first current signal conditioning link 15 of the multirange load module 1 of every phase and the second current signal conditioning link 16 are respectively by the low voltage signal after adjustment
, the first low current signal
with the second low current signal
low voltage digital signal is converted to through analog to digital converter ADC
, the first low current digital signal
with the second low current digital signal
.
Low voltage digital signal
, the first low current digital signal
with the second low current digital signal
through digital signal processor DSP as follows respectively to the low voltage digital signal of each phase
, the first low current digital signal
with the second low current digital signal
carry out digital integration obtain three-phase electric energy data and three-phase electric energy data are delivered to energy data output module.
The formula that digital signal processor DSP carries out digital integration is:
In above formula,
the time of individual computation period,
the no-load voltage ratio constant of voltage input element,
the no-load voltage ratio of individual computation period electric current input element,
calculate corresponding phase active energy phase current digital signal used;
The input circuit of three-phase of the present invention is symmetrical, voltage transformer pt
x11 preferred electric resistance partial pressure type PT, the preferred electromagnetic type CT of each current transformer, the no-load voltage ratio of the CT that two current paths are used is different: the ER effect ratio of conventional path CT1 plus signal conditioning link is
, impact the ER effect ratio of path CT2 plus signal conditioning link
be
60 times,
choose by formula (1).
Each signal condition link is custom circuit, and analog to digital converter is recommended with 16 ADC, and digital signal processor is recommended with 32 bit DSPs (as TMS320F2812), and display, communication port, pulse output etc. are the same with conventional electric energy meter.
Claims (1)
1. a super-wide range impact load electric energy meter, is made up of A, B, C phase multirange load module, analog to digital converter ADC, digital signal processor DSP, energy data output module; It is characterized in that:
Each phase multirange load module comprises voltage transformer pt respectively
x, the first Current Transmit
x1 and second Current Transmit
x2, voltage signal conditioning link, the first current signal conditioning link and the second current signal conditioning link;
The voltage transformer pt of each phase multirange load module
xby the voltage signal of corresponding phase
be transformed to low voltage signal
and by low voltage signal
deliver to voltage signal conditioning link, the first Current Transmit of each phase multirange load module
x1 presses ER effect ratio
by the current signal of corresponding phase
be transformed to the first low current signal
and by the first low current signal
deliver to the first current signal conditioning link, the second Current Transmit
x2 press ER effect ratio
by the current signal of corresponding phase
be transformed to the second low current signal
and by the second low current signal
deliver to the second current signal conditioning link, above-mentioned
k i2<
k i1;
The voltage signal conditioning link of the multirange load module of every phase, the first current signal nurse one's health link and the second current signal nurses one's health link respectively by the low voltage signal after adjustment
, the first low current signal
with the second low current signal
low voltage digital signal is converted to through analog to digital converter ADC
, the first low current digital signal
with the second low current digital signal
;
Low voltage digital signal
, the first low current digital signal
with the second low current digital signal
through the low voltage digital signal of digital signal processor DSP to each phase
, the first low current digital signal
with the second low current digital signal
carry out digital integration obtain three-phase electric energy data and three-phase electric energy data are delivered to energy data output module;
The formula that described digital signal processor DSP carries out digital integration is:
In above formula,
the time of individual computation period,
the no-load voltage ratio constant of voltage input element,
the no-load voltage ratio of individual computation period electric current input element,
calculate corresponding phase active energy phase current digital signal used;
Described digital signal processor DSP includes a current channel autoselector,
individual computation period, the selection principle of current channel autoselector is:
Wherein,
with
that digital signal processor DSP is respectively
individual computation period calculates the electric energy of corresponding phase current digital amount used and ER effect ratio,
with
that analog to digital converter ADC carries out linear analog-to-digital positive maximum number amount and negative lowest numeric amount respectively.
Priority Applications (1)
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|---|---|---|---|
| CN201410557534.4A CN104280609B (en) | 2014-10-20 | 2014-10-20 | Ultra-wide-range impact load electric energy meter |
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|---|---|---|---|
| CN201410557534.4A CN104280609B (en) | 2014-10-20 | 2014-10-20 | Ultra-wide-range impact load electric energy meter |
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| CN104280609A true CN104280609A (en) | 2015-01-14 |
| CN104280609B CN104280609B (en) | 2017-05-17 |
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990382A (en) * | 2017-02-10 | 2017-07-28 | 国网浙江台州市黄岩区供电公司 | Impact load is to electric energy metering error remote monitoring method |
| CN113484603A (en) * | 2021-07-26 | 2021-10-08 | 国网信息通信产业集团有限公司 | Electric energy metering system and method |
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| CN201355376Y (en) * | 2009-02-27 | 2009-12-02 | 四川启明星蜀达电气有限公司 | Ultra-wide range single-phase multi-rate watt-hour meter |
| CN102981083A (en) * | 2012-12-05 | 2013-03-20 | 江苏中凌高科技有限公司 | Self-calibration electric energy quality monitoring device |
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2014
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Patent Citations (3)
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| CN201191304Y (en) * | 2008-04-25 | 2009-02-04 | 四川启明星蜀达电气有限公司 | Electrical energy meter of ultra-wide metering range |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990382A (en) * | 2017-02-10 | 2017-07-28 | 国网浙江台州市黄岩区供电公司 | Impact load is to electric energy metering error remote monitoring method |
| CN113484603A (en) * | 2021-07-26 | 2021-10-08 | 国网信息通信产业集团有限公司 | Electric energy metering system and method |
| CN113484603B (en) * | 2021-07-26 | 2024-02-09 | 国网信息通信产业集团有限公司 | Electric energy metering system and method |
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| CN104280609B (en) | 2017-05-17 |
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Address after: 225008 Yangzhou, Hanjiang District, Jiangsu, Sichuan East Road, No. 168 Applicant after: Jiangsu ATrend high-tech incorporated company Address before: 225008 Yangzhou, Hanjiang District, Jiangsu, Sichuan East Road, No. 168 Applicant before: Jiangsu Zhongling Hi-Tech Development Co., Ltd. |
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