JPH07294589A - Method for collecting electricity quantity information on power system failure - Google Patents
Method for collecting electricity quantity information on power system failureInfo
- Publication number
- JPH07294589A JPH07294589A JP8965994A JP8965994A JPH07294589A JP H07294589 A JPH07294589 A JP H07294589A JP 8965994 A JP8965994 A JP 8965994A JP 8965994 A JP8965994 A JP 8965994A JP H07294589 A JPH07294589 A JP H07294589A
- Authority
- JP
- Japan
- Prior art keywords
- time
- data
- failure
- current
- reference value
- 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
Links
Landscapes
- Locating Faults (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は、電力系統において故
障が発生し、しゃ断器が動作するまでの僅かな時間を利
用して電圧,電流およびインピーダンスなどの電気量情
報を収集する場合の、電力系統故障時の電気量情報収集
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electric power when a quantity of electricity such as voltage, current and impedance is collected by using a short time until a breaker operates in a power system. The present invention relates to a method of collecting information on the amount of electricity when a system failure occurs.
【0002】[0002]
【従来の技術】従来、この種の方式として、図4に示す
ものが知られている。図4(イ)はその概要を示す概要
図、図4(ロ)はその動作を説明するための波形図であ
る。すなわち、同図(イ)のように故障検出リレー(以
下、単にリレーともいう)1とタイマ2とを設け、同図
(ロ)のように故障発生によって故障検出リレー1が動
作したら、それから一定時間t後に一定時間Tだけタイ
マ2を動作させ、この間にデータを収集するようにして
いる。これは、故障検出リレー1が動作した後の一定時
間t後の電気量は安定しており、誤差も少ない筈である
ということが前提となっている。2. Description of the Related Art Conventionally, a system shown in FIG. 4 is known as a system of this type. FIG. 4A is a schematic diagram showing the outline thereof, and FIG. 4B is a waveform diagram for explaining the operation. That is, a failure detection relay (hereinafter, also simply referred to as a relay) 1 and a timer 2 are provided as shown in FIG. 9B, and if the failure detection relay 1 operates due to a failure occurrence as shown in FIG. The timer 2 is operated for a fixed time T after the time t, and data is collected during this period. This is based on the premise that the amount of electricity after a certain time t after the operation of the failure detection relay 1 is stable and the error should be small.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、上記の
ような方法では、故障形態,故障継続時間および故障検
出リレーの動作時間などのパラメータによって、電気量
データの安定する時刻が異なる、つまり一定時間tは一
定ではなく種々の条件で変動するため、その時点のデー
タが最も安定しているのかどうかは不明であり、不安定
なデータを収集してしまうおそれがあるという問題があ
る。したがって、この発明の課題はできるだけ安定なデ
ータを収集し得るようにすることにある。However, in the above method, the stable time of the electric quantity data varies depending on parameters such as the failure mode, the failure duration time, and the operation time of the failure detection relay, that is, the constant time t. Is not constant and varies under various conditions, it is unknown whether the data at that time is the most stable, and there is a problem that unstable data may be collected. Therefore, an object of the present invention is to collect data as stable as possible.
【0004】[0004]
【課題を解決するための手段】このような課題を解決す
るため、この発明では、電力系統に設置され故障発生時
に動作する故障リレーの動作を監視し、これが動作した
時点から電圧,電流を含む電気量を一定のサンプリング
周期をもって一定時間だけ収集して所定のメモリに記憶
したのち、この記憶された情報のうち、故障発生時から
所定時刻後の時点の電気量を基準とし、その前後の各電
気量の基準値との差を逐次比較して、小さい方に対応す
る時点の電気量を選択する処理を一定時間だけ実行し、
この間の情報を故障点標定演算を含む各種演算のための
正規データとして採用することを特徴としている。In order to solve such a problem, according to the present invention, the operation of a fault relay installed in a power system and operating at the time of occurrence of a fault is monitored, and the voltage and current are included from the time when the fault relay operates. After collecting the amount of electricity for a certain period of time with a certain sampling period and storing it in a predetermined memory, the stored amount of information is based on the amount of electricity at the time after a predetermined time from the occurrence of the failure, and before and after that. Sequentially comparing the difference with the reference value of the amount of electricity, execute the process of selecting the amount of electricity at the time corresponding to the smaller one for a certain period of time,
It is characterized in that the information during this period is adopted as the normal data for various calculations including the fault location calculation.
【0005】[0005]
【作用】故障発生時から所定の電気量データをサンプリ
ングし、一定時間後のデータを基準としてその前後のデ
ータの変化状態から、データが安定しているかどうかを
実際にチェックすることにより、従来よりも信頼性の高
いデータを得られるようにし、故障点標定演算などが高
精度に実行できるようにする。[Function] Since a predetermined amount of electricity data is sampled from the time of occurrence of a failure and data is actually stable from the change state of the data before and after the predetermined time after the data is used as a reference, Also makes it possible to obtain highly reliable data, and to perform fault location calculation and the like with high accuracy.
【0006】[0006]
【実施例】図1はこの発明の実施例を示すフローチャー
トである。ここでは、例えば計算機等のディジタル処理
装置(故障点標定装置)を用いて、故障点標定を行なう
ためのデータを収集する場合を想定しており、したがっ
て、図1は故障点標定装置の動作を示すものと言える。
また、ここでは電気量として主に電流を考えることとす
る。1 is a flow chart showing an embodiment of the present invention. Here, it is assumed that a digital processing device (fault point locating device) such as a computer is used to collect data for performing the fault point locating. Therefore, FIG. 1 shows the operation of the fault point locating device. It can be said to show.
In addition, here, the current is mainly considered as the quantity of electricity.
【0007】まず、ステップS1で、故障発生時点t0
から所定時間後、例えばデータが充分に安定すると考え
られる時間後の、時刻trにおける電流値を例えばI
n-m とし、これを基準値Iref とする(|Iref |=|
In-m |)。なお、|I|はIの絶対値を示す。次に、
ループカウンタxを0とし、引数a,bをそれぞれ0と
して初期化を行なう(ステップS2,S3)。First, at step S1, a failure occurrence time t0
After a predetermined time from, for example, the time at which the data is considered to be sufficiently stable, the current value at time tr is
nm, and this as a reference value I ref (| I ref | = |
I nm |). Note that | I | indicates the absolute value of I. next,
Initialization is performed by setting the loop counter x to 0 and the arguments a and b to 0 (steps S2 and S3).
【0008】ステップS4では、基準値In-m の右側の
a時刻後のデータIn-m+a と基準値Iref との差||I
n-m+a |−|Iref ||、左側のb時刻前のデータI
n-m-bと基準値Iref との差||In-m-b |−|Iref
||を互いに比較し、どちらか小さい値となる時点のデ
ータを、信頼すべき標定用のデータとして採用する(ス
テップS5およびステップS6)。以後は、引数a,b
の更新(b=b+1,a=a+1)およびループカウン
タxの更新(x=x+1)を行ない、N+1サンプリン
グ分(0〜N)だけデータを収集する(ステップS7,
S8,S9,S10)。In step S4, the difference || I between the reference value I ref and the data I n-m + a after time a on the right side of the reference value I nm.
n-m + a |-| I ref ||, left side data I before time b
Difference between nmb and reference value I ref || I nmb |-| I ref
|| are compared with each other, and the data at the time of whichever is smaller is adopted as the data for reliable orientation (steps S5 and S6). After that, arguments a and b
(B = b + 1, a = a + 1) and the loop counter x are updated (x = x + 1) to collect data for N + 1 samplings (0 to N) (step S7,
S8, S9, S10).
【0009】このときの様子を分かり易く示すのが図2
で、各時刻とその各時刻でのデータとの関係を示してい
る。ここでは、時刻n−2mとそのときのデータ値I
n-2m、基準時刻n−mとその時点におけるデータ値I
n-m 、時刻nとそのときのデータ値In などを示してい
る。なお、各時刻はn−2m,n−m,nの順に順次新
しくなるものとしている。FIG. 2 shows the situation at this time in an easy-to-understand manner.
Shows the relationship between each time and the data at each time. Here, the time n-2m and the data value I at that time
n-2m , reference time nm and data value I at that time
nm , time n, and the data value I n at that time are shown. It should be noted that each time is sequentially updated in the order of n-2m, nm, and n.
【0010】図3はこの発明の概念を説明するための波
形図で、(イ)は変圧器(PT)の出力電圧、(ロ)は
変流器(CT)の出力電流、(ハ)はフィルタ出力電
圧、(ニ)はフィルタ出力電流、(ホ)は電流実効値の
演算値、(ヘ)は故障検出リレーの出力、(ト)は標定
精度をそれぞれ示す波形例である。したがって、ここで
は送電線にはPT,CTを設置するとともに、その出力
にはそれぞれフィルタを設けて波形の整形を行なうよう
にした例と言える。FIG. 3 is a waveform diagram for explaining the concept of the present invention. (A) is the output voltage of the transformer (PT), (b) is the output current of the current transformer (CT), and (c) is The filter output voltage, (d) is the filter output current, (e) is the calculated value of the effective current value, (f) is the output of the failure detection relay, and (g) is a waveform example showing the orientation accuracy. Therefore, it can be said that here, PT and CT are installed in the power transmission line, and filters are provided at the outputs thereof to shape the waveform.
【0011】すなわち、図3に示すように時刻t0で系
統故障が発生すると、各部の波形は同図(イ)〜(ニ)
のようになり、電流の実効値の演算結果は同図(ホ)、
故障検出リレーの動作波形は同図(ヘ)のようになる。
この(ヘ)で斜線を付した部分は、故障検出リレーの動
作が不安定な時期を示しており、したがって、この間を
除いた期間、つまり同図では時刻t1とt2の間に電流
実効値の演算を行なえば、同図(ト)のように標定演算
誤差を小さくできることが分かる。That is, as shown in FIG. 3, when a system failure occurs at time t0, the waveforms of the respective parts are (a) to (d) in FIG.
The calculation result of the effective value of the current is shown in the figure (e),
The operation waveform of the failure detection relay is as shown in (f) of the same figure.
The shaded portion in (f) indicates the period when the operation of the failure detection relay is unstable. Therefore, the period excluding this period, that is, the time between the time t1 and the time t2 in the figure, indicates the effective current value. It can be seen that if the calculation is performed, the orientation calculation error can be reduced as shown in FIG.
【0012】ところで、従来は系統故障が発生した時刻
t0から、データが安定するであろう或る一定時間経過
後のデータをとるようにしているが、これは上述のよう
に故障形態,故障継続時間および故障検出リレーの動作
時間などの各パラメータによって変化する。このため、
この発明では或る一定時間経過後のデータを基準とし
て、その前後のデータを実際にチェックしその変動分の
少ない時刻のデータを採用するようにしている。By the way, conventionally, the data is taken after a certain period of time in which the data will be stable from the time t0 at which the system failure occurs. It varies depending on each parameter such as time and operating time of the failure detection relay. For this reason,
In the present invention, the data after a certain period of time is used as a reference, the data before and after that is actually checked, and the data at the time when the variation is small is adopted.
【0013】ただし、このようにしても系統高調波や過
渡成分によっては、このデータに誤差を含むことは避け
られないので、1ショトのデータによる1ショトの標定
演算ではなく、複数時刻のデータを用いて複数回の標定
演算を行ない、その平均値をとるようにするなどの手当
てをすることが望ましい。However, even in this case, it is unavoidable that this data contains an error depending on the system harmonics and transient components. Therefore, the data for a plurality of time points are not used for the orientation calculation for one shot with the data for one shot. It is desirable to take measures such as carrying out orientation calculation a plurality of times using the average value, and taking the average value.
【0014】なお、上記では系統の電流,電圧に着目し
たが、その他インピーダンスなどの電気量に着目しても
良いものである。また、電流と言っても3相電流,零相
電流などがあるが、そのうちのどれに着目するかは、故
障形態等に応じて例えば以下のようにする。Although the current and voltage of the system have been focused on in the above, it is also possible to focus on other electrical quantities such as impedance. Moreover, although there are three-phase currents, zero-phase currents, and the like, even if it is called a current, which of them is to be focused on is, for example, as follows according to the failure mode.
【0015】(1)短絡,2相地絡では、故障相(2相
以上)に大きな正相電流が流れる。よって、最大の線間
電流の流れる相(線間)を故障相として、その相に着目
するようにする。 (2)1線地絡では、零相電流に着目する。特に、高抵
抗接地系では、1線地絡時の故障電流が小さいため、故
障電流が負荷電流にまぎれ込んでしまう。そのため、負
荷電流の影響を受けない零相電流を用いるというわけで
ある。(1) With a short circuit and a two-phase ground fault, a large positive-phase current flows in the fault phase (two or more phases). Therefore, the phase in which the maximum line-to-line current flows (line-to-line) is taken as the failure phase and attention is paid to that phase. (2) At 1-line ground fault, pay attention to the zero-phase current. In particular, in the high resistance grounding system, the fault current at the time of one-line ground fault is small, so the fault current is mixed in with the load current. Therefore, the zero-phase current that is not affected by the load current is used.
【0016】[0016]
【発明の効果】この発明によれば、故障発生時からデー
タをサンプリングし、一定時間後のデータを基準として
その前後のデータ変化量をチェックするするようにした
ので、データが実際に安定しているかどうかを知ること
ができ、信頼性の高いデータを得ることができる。その
結果、精度の高い標定演算などを行なうことが可能とな
る利点がもたらされる。According to the present invention, data is sampled from the time of occurrence of a failure and the amount of data change before and after that is checked with reference to the data after a fixed time, so that the data is actually stable. It is possible to know whether or not there is, and it is possible to obtain highly reliable data. As a result, there is an advantage that it is possible to perform highly accurate orientation calculation.
【図1】この発明の実施例を示すフローチャートであ
る。FIG. 1 is a flow chart showing an embodiment of the present invention.
【図2】この発明の概念を説明するための説明図であ
る。FIG. 2 is an explanatory diagram for explaining the concept of the present invention.
【図3】この発明の実施例を説明するための波形図であ
る。FIG. 3 is a waveform chart for explaining an embodiment of the present invention.
【図4】従来例を説明するための説明図である。FIG. 4 is an explanatory diagram for explaining a conventional example.
1…故障検出リレー、2…タイマ。 1 ... Failure detection relay, 2 ... Timer.
Claims (1)
る故障リレーの動作を監視し、これが動作した時点から
電圧,電流を含む電気量を一定のサンプリング周期をも
って一定時間だけ収集して所定のメモリに記憶したの
ち、この記憶された情報のうち、故障発生時から所定時
刻後の時点の電気量を基準とし、その前後の各電気量の
基準値との差を逐次比較して、小さい方に対応する時点
の電気量を選択する処理を一定時間だけ実行し、この間
の情報を故障点標定演算を含む各種演算のための正規デ
ータとして採用することを特徴とする電力系統故障時の
電気量情報収集方法。1. A predetermined memory that monitors the operation of a fault relay that is installed in a power system and that operates when a fault occurs, and collects the amount of electricity including voltage and current for a certain period of time with a certain sampling period from the time when the fault relay operates. Of the stored information, the electric quantity at a predetermined time after the occurrence of the failure is used as a reference, and the difference between the electric quantity before and after the reference value is sequentially compared, and the smaller one is selected. Electricity information at the time of a power system failure, characterized by executing the process of selecting the electricity quantity at the corresponding time point for a certain period of time and adopting the information during this time as regular data for various calculations including the fault point calculation Collection method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP08965994A JP3305493B2 (en) | 1994-04-27 | 1994-04-27 | Electricity information collection method in case of power system failure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP08965994A JP3305493B2 (en) | 1994-04-27 | 1994-04-27 | Electricity information collection method in case of power system failure |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07294589A true JPH07294589A (en) | 1995-11-10 |
JP3305493B2 JP3305493B2 (en) | 2002-07-22 |
Family
ID=13976891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP08965994A Expired - Fee Related JP3305493B2 (en) | 1994-04-27 | 1994-04-27 | Electricity information collection method in case of power system failure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3305493B2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003230225A (en) * | 2002-01-31 | 2003-08-15 | Chubu Electric Power Co Inc | Locating system for fault point |
CN102313857A (en) * | 2011-07-04 | 2012-01-11 | 武汉大学 | Method and device for analyzing fault recording data of power system |
CN103901319A (en) * | 2014-03-03 | 2014-07-02 | 广州供电局有限公司 | Method for detecting transient voltage stability of power grid |
JP2015040848A (en) * | 2013-08-23 | 2015-03-02 | 株式会社日立製作所 | Fault locator and fault location method |
CN113655427A (en) * | 2021-09-09 | 2021-11-16 | 国网上海市电力公司 | Automatic fault reporting method and system for metering equipment |
-
1994
- 1994-04-27 JP JP08965994A patent/JP3305493B2/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003230225A (en) * | 2002-01-31 | 2003-08-15 | Chubu Electric Power Co Inc | Locating system for fault point |
CN102313857A (en) * | 2011-07-04 | 2012-01-11 | 武汉大学 | Method and device for analyzing fault recording data of power system |
JP2015040848A (en) * | 2013-08-23 | 2015-03-02 | 株式会社日立製作所 | Fault locator and fault location method |
CN103901319A (en) * | 2014-03-03 | 2014-07-02 | 广州供电局有限公司 | Method for detecting transient voltage stability of power grid |
CN113655427A (en) * | 2021-09-09 | 2021-11-16 | 国网上海市电力公司 | Automatic fault reporting method and system for metering equipment |
Also Published As
Publication number | Publication date |
---|---|
JP3305493B2 (en) | 2002-07-22 |
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