JPH03180770A - Measuring system for electrical variation - Google Patents

Measuring system for electrical variation

Info

Publication number
JPH03180770A
JPH03180770A JP32081689A JP32081689A JPH03180770A JP H03180770 A JPH03180770 A JP H03180770A JP 32081689 A JP32081689 A JP 32081689A JP 32081689 A JP32081689 A JP 32081689A JP H03180770 A JPH03180770 A JP H03180770A
Authority
JP
Japan
Prior art keywords
measurement
input signal
sampling
data
synchronous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP32081689A
Other languages
Japanese (ja)
Other versions
JP2995769B2 (en
Inventor
Yoshihiro Kawasaki
好博 川崎
Hiroaki Shirasago
白砂 浩章
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Publication date
Application filed by Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP1320816A priority Critical patent/JP2995769B2/en
Publication of JPH03180770A publication Critical patent/JPH03180770A/en
Application granted granted Critical
Publication of JP2995769B2 publication Critical patent/JP2995769B2/en
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Expired - Fee Related legal-status Critical Current

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  • Measuring Phase Differences (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To prevent errors due to an input containing DC and high frequency components and due to a frequency fluctuation by sampling a synchronous input signal and measurement input signal during one cycle of the synchronous input signal taken out from a cable line, at a constant interval. CONSTITUTION:The synchronous input signal and the measurement input signals are inputted to an A/D conversion part 2 through transformers in an auxiliary detecting part 1. In the conversion part 2, an exact one cycle period is measured by making the synchronous input signal to pass through a BPF and the high frequencies higher than objective one for the measurement are cut by making the measurement input signals to pass through LPFs. Each input signal, after subjected to sample and hold by respective sampling hold circuits S/H, are summarized by a multiplexer MPX and subjected to A/D conversion then outputted to a processor part 3. At this time, a Fourier transformation using sampling data of one cycle is performed for the high frequency measurement, and a high speed sampling is made for realizing the accurate measurement. Finally in the processor part 3, a calculation of fundamental components is performed by Fourier transform means by using the data subjected to A/D conversion.

Description

【発明の詳細な説明】 A、産業上の利用分野 この発明は、電線路の電圧、N流1位相、有効電力、無
効電力、高調波等を測定する方式に関し、特に、電圧、
電流のアナログ検出信号をディジタル信号に変換してデ
ータ処理の高精度化を図ったものである。
DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of Application The present invention relates to a method for measuring voltage, N current, one phase, active power, reactive power, harmonics, etc. of electric lines, and in particular, it relates to a method for measuring voltage, N current, one phase, active power, reactive power, harmonics, etc.
This converts the analog current detection signal into a digital signal to improve the accuracy of data processing.

B1発明の概要 この発明は電線路の電圧、電−流をアナログ量で検出し
て電流値、電圧値1位相、有効電力、無効電力又は高調
波成分等を測定する測定方式にわいて、 前記電線路から同期入力信号と測定入力信号を取り出し
、同期入力信号の1周期分における同期入力信号と測定
入力信号を一定間隔でサンプリングし、このサンプリン
グした同期入力データと測定入力データを使用し、同期
入力データにより1周期分のサンプリング個数を判定し
、そのサンプリング数により演算に使用する測定入力デ
ータを決定するとともに、この決定された測定入力デー
タを使用してフーリエ変換手段により、基本波成分のみ
を抽出し直流分、高調波を取り除くようにすることによ
り、 直流分及び高調波成分を含む入力による誤差と周波数変
動による誤差を防ぐ技術を提供するものである。
B1 Summary of the Invention The present invention relates to a measurement method for detecting the voltage and current of an electric line as analog quantities and measuring the current value, voltage value 1 phase, active power, reactive power, harmonic components, etc. Take out the synchronization input signal and measurement input signal from the electric line, sample the synchronization input signal and measurement input signal for one cycle of the synchronization input signal at regular intervals, and use the sampled synchronization input data and measurement input data to perform synchronization. The number of samplings for one cycle is determined based on the input data, and the measured input data to be used for calculation is determined based on the number of samplings.The determined measured input data is used to convert only the fundamental wave component by Fourier transform means. By extracting and removing the DC component and harmonics, the present invention provides a technology that prevents errors caused by inputs containing DC components and harmonics as well as errors due to frequency fluctuations.

C1従来の技術 電線路の電圧、電流を検出して電圧値、電流醒相、有効
電力、無効電力等のデータを測定する方式としては、一
般に電圧と電流をアナログ量で検出し、これをディジタ
ル変換してコンピュータてデータ処理され電圧値、電流
値1位相、有効。
C1 Conventional technology The method of detecting the voltage and current of a power line and measuring data such as voltage value, current rising phase, active power, and reactive power is generally to detect the voltage and current as analog quantities, and then convert them into digital data. The data is converted and processed by a computer, and the voltage value and current value are 1 phase and valid.

無効電力等の測定を行っている。Measures reactive power, etc.

00発明か解決しようとする課題 しかしながら、従来の用足方式には下記の課題があった
00 Problems to be Solved by the Invention However, the conventional foot system had the following problems.

(1)アナログの検出入力信号には直流分やKFI波を
含有するため測定結果に誤差を生ずる。
(1) Analog detection input signals contain DC components and KFI waves, which causes errors in measurement results.

(2)また、アナログの検出入力信号の周波数変動が起
こると測定結果に誤差を生ずる。
(2) Furthermore, if frequency fluctuations occur in the analog detection input signal, errors will occur in the measurement results.

本発明は、このような課題に鑑みて創案されたもので、
直流分及び高調波成分を含む入力による誤差や周波数変
動による誤差を防いだ測定方式を提供することを目的と
する。
The present invention was created in view of these problems, and
The purpose of this invention is to provide a measurement method that prevents errors caused by inputs including DC and harmonic components and errors caused by frequency fluctuations.

81課題を解決するための手段 本発明1こおける上記課題を解決するための手段は、電
線路の電圧、電流をアナログ量で検出して電流値、N圧
値1位相、有効電力、無効電力又は高調波成分等を測定
する測定方式において、前記電線路から同期入力信号と
ポ11定入力信号を取り出し、同期入力信号の1周期分
におけろ同期入力信号と測定入力信号を一定間隔でサン
プリングし、このサンプリングした同期入力データと測
定入力データを使用し、同期入力データにより1周期分
のサンプリング個数を判定し、そのサンプリング数によ
り′iri算に使用する測定入力データを決定するとと
もに、この決定された測定入力データを使用してフーリ
エ変換手段により、基本波成分のみを抽出し直流分、高
調波を取り除く。
81 Means for Solving the Problems The means for solving the above problems in the first aspect of the present invention is to detect the voltage and current of the electric line in analog quantities and calculate the current value, N pressure value, one phase, active power, and reactive power. Alternatively, in a measurement method for measuring harmonic components, etc., the synchronous input signal and the constant input signal are extracted from the electric line, and the synchronous input signal and measurement input signal are sampled at regular intervals during one period of the synchronous input signal. Then, using this sampled synchronization input data and measurement input data, determine the number of samplings for one period based on the synchronization input data, determine the measurement input data to be used for 'iri calculation based on the sampling number, and Using the measured input data, the Fourier transform means extracts only the fundamental wave component and removes the DC component and harmonics.

F0作珂 本発明は、直流及び高調波成分を確実に削除して基本波
のみを抽出し、その基本波の周波数を周波数変動に合わ
せるようにしたもので、高週波の測定ら可能とする。そ
の方法としてはフーリエ変換手段により基本波を抽出す
るようにし、周波数が変動したことは同期入力により検
出する。
The present invention reliably removes direct current and harmonic components to extract only the fundamental wave, and matches the frequency of the fundamental wave to frequency fluctuations, making it possible to measure high frequency waves. The method is to extract the fundamental wave using a Fourier transform means, and to detect a change in frequency using a synchronization input.

本発明の測定方式はアナログディジタル変換部(以下、
A/D変換部と略称する)とプロセッサ部とを備え、A
/D変換部は1m期分のサンブリングデータを同期入力
させてその個数を検出し、高速サンプリング及びフーリ
エ変換で測定データを2値化し、プロセッサ部はフーリ
エ変換部で測定テデータを演算処理する。そのサンプリ
ング周波数は同期入力周波数の整数(ぎとし、測定部は
2つの母線電圧の和を同期入力する。プロセッサ部は、
データを記録する半導体メモリを備えろと共に、計測パ
ネルが接続されていて、操作者はその計測パネルの画面
との対話処理により演算測定を行うものとする。
The measurement method of the present invention uses an analog-to-digital converter (hereinafter referred to as
A/D conversion section) and a processor section,
The /D conversion unit synchronously inputs sampling data for 1 m periods, detects the number of data, binarizes the measurement data by high-speed sampling and Fourier transformation, and the processor unit uses the Fourier transformation unit to perform arithmetic processing on the measurement data. The sampling frequency is an integer of the synchronous input frequency, and the measuring section synchronously inputs the sum of the two bus voltages.The processor section
In addition to being equipped with a semiconductor memory for recording data, a measurement panel is connected, and an operator performs calculation measurements by interacting with the screen of the measurement panel.

G 実施例 以下、図面を参照して、本発明の実施例を詳細に説明す
る。
G. Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

第1図は、本発明の一実施例の構成図である。FIG. 1 is a block diagram of an embodiment of the present invention.

図中、lは浦助検出部、2はA/D変換部、3はプロセ
ッサ部、4は整定パネル、5は計測パネルである。
In the figure, 1 is an Urasuke detection section, 2 is an A/D conversion section, 3 is a processor section, 4 is a settling panel, and 5 is a measurement panel.

A/D変換部2は下記の如く構成されている。The A/D converter 2 is configured as follows.

(1)同期入力信号に対しては、正確に1サイクル周期
を測定するため基本波付近を透過させるバンドパスフィ
ルタ(BPF)を配設した。
(1) For the synchronization input signal, a bandpass filter (BPF) that transmits the vicinity of the fundamental wave is provided in order to accurately measure one cycle period.

(2)測定入力信号に対しては、測定対象となる高調波
より高い周波数をカットするローパスフィルタ(LPF
’)を配設した。
(2) For the measurement input signal, use a low-pass filter (LPF) that cuts frequencies higher than the harmonics to be measured.
') was installed.

(3)高調波の測定には1周期(Iサイクル)のサンプ
リングデータによるフーリエ変換を使用し、高精度の測
定を実現するため高速サンプリングを行う。プロセッサ
部3は、アナログ/ディジタル変換されたデータを使用
してフーリエ変換方式により電圧8電流9位相、有効電
力、無効電力、高調波等の値を演算する部分で、得られ
た結果は内部メモリに記録する。
(3) To measure harmonics, use Fourier transform using one period (I cycle) of sampling data, and perform high-speed sampling to achieve highly accurate measurement. The processor section 3 is a section that uses the analog/digital converted data to calculate values such as voltage, current, nine phases, active power, reactive power, harmonics, etc. using the Fourier transform method, and the obtained results are stored in the internal memory. to be recorded.

整定パネル4は、測定の起動条件等を設定するために配
設されている。
The setting panel 4 is provided for setting starting conditions for measurement and the like.

計測パネル5は、測定値を表示するために配設されてい
る。
The measurement panel 5 is arranged to display measured values.

第2図は、第1図に示した実施例の測定処理のフローチ
ャートである。同図において、フローの開始は入力で、
浦助検出部Iの変成器を介して同期入力信号と測定入力
信号が、A/D変換部2に入力される。A/D変換部2
では、同期入力信号をバンドパスフィルタに通して王確
な1サイクル周期を測定し、測定入力信号をローパスフ
ィルタに通して測定対象よりも高い高調波をカントする
FIG. 2 is a flowchart of the measurement process of the embodiment shown in FIG. In the same figure, the start of the flow is the input,
A synchronization input signal and a measurement input signal are input to the A/D conversion section 2 via the transformer of the Urasuke detection section I. A/D converter 2
Now, the synchronization input signal is passed through a bandpass filter to measure the exact period of one cycle, and the measurement input signal is passed through a lowpass filter to cant harmonics higher than the measurement target.

次は1サイクル分の記憶で、前記フィルタより取り出さ
れた各入力信号はそれぞれサンプリングホールド回路(
S / H)でサンプリングホールドされたのち、それ
らをマルチプレクサ(MPX)で総括され、アナログデ
ィジタル変換器(A/D)でディジタル化されてプロセ
ッサ部3へ出力される。このとき高調波の測定に1サイ
クルのサンプリングデータを使用したフーリエ変換を行
い、高精度測定を実現するために高速サンプリングを行
う。最後にプロセッサ部3でA/D変換されたデータを
使用し、フーリエ変換手段により基本波成分演算を行う
Next, one cycle of memory is stored, and each input signal taken out from the filter is stored in a sampling and hold circuit (
After being sampled and held by S/H), they are summed up by a multiplexer (MPX), digitized by an analog/digital converter (A/D), and output to the processor section 3. At this time, Fourier transform using one cycle of sampling data is performed to measure the harmonics, and high-speed sampling is performed to achieve high-precision measurement. Finally, using the A/D converted data in the processor section 3, fundamental wave component calculation is performed by Fourier transform means.

第3図は、上記実施例に使用される測定部位の一例を示
す回路図である。同図に示す如く、同期入力信号は、周
波数が常に得られるように母線AとBから電圧v、、V
tを取り、加算手段3Iを介して、補助検出部I(第1
図)に入力する。■1とV、を加算するのは、片母線停
電の場合でも測定を可能にするためである。一方で測定
入力信号は、測定内容によって異なるが、電線路、即ち
、母線A、BのN康v、、V2及び配電線路に設けた変
流器CT、〜CTnにより検出され、補助検出部lに入
力される。
FIG. 3 is a circuit diagram showing an example of a measurement site used in the above embodiment. As shown in the figure, the synchronization input signal is applied to voltages v, , V from buses A and B so that the frequency is always obtained.
t is taken and added to the auxiliary detection section I (first
(Figure). (1) The reason for adding 1 and V is to enable measurement even in the case of a single bus power outage. On the other hand, the measurement input signal varies depending on the content of the measurement, but is detected by the electric lines, that is, the current transformers CT to CTn provided on the bus lines A and B, V2, and the distribution line, and is detected by the auxiliary detection section l. is input.

第4図は、上記測定処理の概要を示す説明図である。同
図に示す所定の間隔△Lでサンプリングした同期入力デ
ータX。+ x+−X 、、+  X□、1と測定入力
データy。、Y1〜5’m、7+−+とが入力されると
、下記の処理を行う。
FIG. 4 is an explanatory diagram showing an overview of the above measurement process. Synchronous input data X sampled at predetermined intervals ΔL shown in the figure. +x+-X,,+X□,1 and measurement input data y. , Y1 to 5'm, and 7+-+ are input, the following processing is performed.

(1)入力モード(1サイクル分) 同期入力信号よりIサイクル分のサンプリング個数(本
例ではm)を判定し、そのpI数(rn)により、演算
に使用する測定入力データyl−3’ m *を決定す
る。
(1) Input mode (1 cycle) Determine the number of samplings for I cycle (m in this example) from the synchronized input signal, and use the pI number (rn) to determine the measured input data yl-3'm used for calculation. *Determine.

(2)処理モード 上記(1)で決定された入力データy1〜y、、。(2) Processing mode Input data y1 to y determined in (1) above.

を使用し、フーリエ変換方式により高調波分析及び各種
測定処理を行う。
Performs harmonic analysis and various measurement processes using the Fourier transform method.

上記の測定処理について更に詳細に説明する。The above measurement process will be explained in more detail.

一定の周期T=1/f=2π/ωで同一波形が繰り返さ
れる歪波交流y (t)は、 y (t )= b 0+ !’ 5Cn・5in(n
 (IJ t+θcn)n=1 (1) で表されろ。
The distorted AC wave y (t) in which the same waveform is repeated at a constant period T = 1/f = 2π/ω is y (t) = b 0+! '5Cn・5in(n
(IJ t+θcn)n=1 (1) Express it as follows.

一定すンプリング期間Tのyx(xm=1.〜m)のデ
ータを使用すると、第n R波の実効値として、 c、=r丁n”+bn”/r丁−−=・(2)tanθ
Crl =t) n/ a nが近似的に成立する。但
し、 a、、=2/m・Σ (y 1sin(n ・2 rr
 / m−X))x=1 b、=1/m・Σ yx x=1 であり、Yxはサンプリングしたデータの瞬時値で、n
=1.2.3・・・である。そこで、総合歪みの実効値
は下式で演算される。
Using the data of yx (xm = 1.~m) with a constant sampling period T, the effective value of the n-th R wave is c, = r d n" + bn"/r d --= (2) tan θ
Crl = t) n/a n holds approximately. However, a,, = 2/m・Σ (y 1sin(n ・2 rr
/ m-X))
=1.2.3... Therefore, the effective value of the total distortion is calculated using the following formula.

ここで、高調波成分の影響や周波数変動の影響を受けな
いようにするには、前記(+)式の基本波成分に着目す
ればよい。
Here, in order to avoid the influence of harmonic components and frequency fluctuations, it is sufficient to focus on the fundamental wave component of the equation (+).

例えば、電圧(V)又は電流(+)の実効値を求める場
合は、電圧又は電流のサンプリング値をy8として、(
2) 式(7) C、= 1 ” / f7−を求めれ
ばよい。また、インピーダンス(Z)をを求める場合は
、(2)式によりV、、I、、θ、θ、を求めたのち、 Z=V、/I。
For example, to find the effective value of voltage (V) or current (+), set the sampling value of voltage or current to y8, and (
2) All you have to do is find the formula (7) C, = 1''/f7-.Also, to find the impedance (Z), after finding V,, I,, θ, θ from the formula (2), , Z=V, /I.

V 、/ 1 x  (cos(θヮ、−θ z)” j  5in(
θヮビθ 1.))を求めればよい。また、有効電力(
P)又(よmt効電力(Q)を求める場合は、やはり(
2)式によりV、、I、、 θ、を求めたのち、 P X V I ・cosθ= V 、+ I 、・c
os(θvl−θ、)Q=VI・siiθ= V + 
’ I + ・5i1(θv1−θ、)を求めればよい
V, / 1 x (cos(θヮ, -θ z)” j 5in(
θヮbiθ 1. )). In addition, the active power (
P) Also, when calculating the mt effective power (Q), (
2) After finding V,, I,, θ, using the formula, P X V I ・cos θ= V , + I, ・c
os(θvl-θ,)Q=VI・siiθ=V+
' I + ·5i1(θv1−θ,) can be obtained.

第5図は、本発明の別な一実施例の構成図及びフローチ
ャートである。木実施例は、一定間隔のサンプリングを
同期入力信号の周波数により決定する方式であり、第1
図実施例と異なるのはA/D変換部52の内部構成であ
る。即ち、未実施例で、測定入力信号は第1図と同様ロ
ーパスフィルタ(LPF)及びサンプルホールド回路(
S / I−1)を経由してマルチプレクサ(M P 
X )へ入力されろが、同期入力信号は周波数検出ファ
ームにより周を数Fを検出され、その周波数Fによりf
5F xmの演算を行ってサンプリング周波数f、を算
出(但し、mは予め決定した整数)し、これをアナログ
ディジタル変換7a (A / D )へ入力する。
FIG. 5 is a block diagram and a flowchart of another embodiment of the present invention. The tree embodiment is a method in which sampling at fixed intervals is determined by the frequency of a synchronized input signal, and the first
What differs from the illustrated embodiment is the internal configuration of the A/D converter 52. That is, this is an unimplemented example, and the measurement input signal is filtered through a low-pass filter (LPF) and sample-and-hold circuit (similar to FIG. 1).
S/I-1) via multiplexer (MP
X
5Fxm is calculated to calculate the sampling frequency f (where m is a predetermined integer), and input this to the analog-to-digital converter 7a (A/D).

本実施%Jは、入力データの個1(m)が正確な1周期
分データなので、フーリエ変換の誤差が一層小さくなる
In this implementation %J, since the input data piece 1 (m) is data for one accurate period, the error of Fourier transform is further reduced.

H1発明の効果 以上、説明したとおり、本発明によれば、直流分及び高
調波成分を含む入力による誤差と周波数変動による誤差
を防ぐことができるとともに下記の効果を奏する。
H1 Effects of the Invention As described above, according to the present invention, it is possible to prevent errors due to inputs including DC components and harmonic components and errors due to frequency fluctuations, and the following effects are achieved.

(1)同期入力信号により1サイクル分のサンプリング
個数又はサンプリング周波数を決定するので、測定入力
の周波数が変動しても電圧値、電流値及び泣相を正確に
測定できる。
(1) Since the number of samples or the sampling frequency for one cycle is determined by the synchronization input signal, the voltage value, current value, and phase can be accurately measured even if the frequency of the measurement input fluctuates.

(2)アナログ/ディジタル変換された測定データは、
フーリエ変換による演算が行われていて、基本波の測定
値は、高調波による誤差かカットされている。
(2) Analog/digital converted measurement data is
Calculations are performed using Fourier transform, and errors caused by harmonics are removed from the measured value of the fundamental wave.

(3)Iサイクルのデータを高速サンプリングしてフー
リエ変換を行うので、高調波の測定を正確に行うことが
できる。
(3) Since I-cycle data is sampled at high speed and subjected to Fourier transformation, harmonics can be measured accurately.

(4)同期入力信号に2つの母線電圧の和を使用すれば
、片方の母線停止時にも測定可能である。
(4) If the sum of two bus voltages is used as the synchronization input signal, measurement is possible even when one bus is stopped.

(5)プロセッサ部に半導体メモリを内蔵し、更に整定
用のパネルを接続することにより、測定値か整定値を越
えたとき記録が起動されるようにし、その過渡応動を1
14記半導体メモリーLに記録することができ、このデ
ータにより過渡応動の解析が可能になる。
(5) By incorporating a semiconductor memory in the processor section and further connecting a setting panel, recording is started when the measured value exceeds the setting value, and the transient response is reduced to 1.
14 can be recorded in the semiconductor memory L, and this data enables analysis of transient response.

(6)プロセッサ部に計測用パネルを接続することによ
り、演算処理の結果である周波数、電圧。
(6) Frequency and voltage that are the results of calculation processing by connecting a measurement panel to the processor section.

電流、有効電力、無効゛電力のすべての要素について、
該パネル上で測定できる。
For all elements of current, active power, and reactive power,
can be measured on the panel.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例の構成図、第2図(よ実施例
の測定処理のフローチャート、′f、3図は実施例の測
定部位の回路図、第4図は実施例のrflll定処理の
説明図、第5図は本発明の別な実施例の構成図及びフロ
ーチャートである。 1・・・甜助検出部、2.52・・・A/D変換部、3
・・・プロセッサ部、4・・・整定パネル、5川計測パ
ネル。 IA、2る 第1図 ホ売明の一實」さテjの講六回 第2図 實患伊1の測定処理のフローナマート 第3図 第4図 実力シマJ(71潔庚シC浬の説明図
Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 is a flowchart of the measurement process of the embodiment, Fig. Fig. 5 is a configuration diagram and a flowchart of another embodiment of the present invention.1...Sensuke detection section, 2.52...A/D conversion section, 3
... Processor section, 4... Setting panel, 5 river measurement panel. IA, 2 Fig. 1. The 6th lecture on the 6th lecture of the 2nd Fig. Diagram of 浬

Claims (2)

【特許請求の範囲】[Claims] (1)電線路の電圧、電流をアナログ量で検出して電流
値、電圧値、位相、有効電力、無効電力又は高調波成分
等を測定する測定方式において、前記電線路から同期入
力信号と測定入力信号を取り出し、同期入力信号の1周
期分における同期入力信号と測定入力信号を一定間隔で
サンプリングし、このサンプリングした同期入力データ
と測定入力データを使用し、同期入力データにより1周
期分のサンプリング個数を判定し、そのサンプリング数
により演算に使用する測定入力データを決定するととも
に、この決定された測定入力データを使用してフーリエ
変換手段により基本波成分のみを抽出し直流分、高調波
を取り除くようにしたことを特徴とする電気的変量の測
定方式。
(1) In a measurement method that detects the voltage and current of an electric line as an analog quantity and measures the current value, voltage value, phase, active power, reactive power, harmonic components, etc., the measurement is performed with a synchronous input signal from the electric line. Take the input signal, sample the synchronous input signal and measurement input signal for one period of the synchronous input signal at regular intervals, use the sampled synchronous input data and measurement input data, and sample one period of the synchronous input data. The number of pieces is determined, and the measured input data to be used for calculation is determined based on the sampling number. Using this determined measured input data, only the fundamental wave component is extracted by Fourier transform means, and the DC component and harmonics are removed. A method for measuring electrical variables characterized by:
(2)同期入力信号を2つの母線の電圧を加算して得た
ことを特徴とする請求項(1)記載の電気的変量の測定
方式。
(2) The method for measuring an electrical variable according to claim (1), wherein the synchronous input signal is obtained by adding the voltages of two busbars.
JP1320816A 1989-12-11 1989-12-11 How to measure electrical variables Expired - Fee Related JP2995769B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1320816A JP2995769B2 (en) 1989-12-11 1989-12-11 How to measure electrical variables

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1320816A JP2995769B2 (en) 1989-12-11 1989-12-11 How to measure electrical variables

Publications (2)

Publication Number Publication Date
JPH03180770A true JPH03180770A (en) 1991-08-06
JP2995769B2 JP2995769B2 (en) 1999-12-27

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ID=18125551

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2995769B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0628828A1 (en) * 1993-06-11 1994-12-14 Schneider Electric Sa Appliance for measuring and counting electrical energy
JP2002251692A (en) * 2001-02-26 2002-09-06 Systec:Kk Vehicle length measuring device and measuring method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6073368A (en) * 1983-09-29 1985-04-25 Nissin Electric Co Ltd Harmonic wave analyser

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6073368A (en) * 1983-09-29 1985-04-25 Nissin Electric Co Ltd Harmonic wave analyser

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0628828A1 (en) * 1993-06-11 1994-12-14 Schneider Electric Sa Appliance for measuring and counting electrical energy
FR2706622A1 (en) * 1993-06-11 1994-12-23 Merlin Gerin Electrical energy measurement and metering device.
JP2002251692A (en) * 2001-02-26 2002-09-06 Systec:Kk Vehicle length measuring device and measuring method

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Publication number Publication date
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