JP2002040085A - Method for locating fault point of branched parallel dual line - Google Patents
Method for locating fault point of branched parallel dual lineInfo
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- JP2002040085A JP2002040085A JP2000229487A JP2000229487A JP2002040085A JP 2002040085 A JP2002040085 A JP 2002040085A JP 2000229487 A JP2000229487 A JP 2000229487A JP 2000229487 A JP2000229487 A JP 2000229487A JP 2002040085 A JP2002040085 A JP 2002040085A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、短い分岐のある平
行２回線系統の故障点標定方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for locating a fault in a parallel two-line system having short branches.
【０００２】[0002]
【従来の技術】電源端の電圧、電流に基づいて平行２回
線送電線の故障点を標定する方法として、地絡故障に対
する零相電流分流比方式、短絡故障に対するインピーダ
ンス方式が知られている。前者の零相電流分流比方式に
よれば、電源端の各回線１Ｌ，２Ｌの零相電流をそれぞ
れＩ01，Ｉ02とすると、電源端から１Ｌ回線の地絡故障
点までの距離ｘは ｘ＝ｄ［２Ｉ02／（Ｉ01＋Ｉ02）］（ｄは送電線の距離） (1) で求められる。２Ｌ回線の地絡故障点までの距離ｘは ｘ＝ｄ［２Ｉ01／（Ｉ01＋Ｉ02）］（ｄは送電線の距離） (2) で求められる。2. Description of the Related Art As a method of locating a fault point of a parallel two-line transmission line based on a voltage and a current at a power supply terminal, a zero-phase current shunt ratio method for a ground fault and an impedance method for a short-circuit fault are known. According to the former zero-phase current shunt ratio method, assuming that the zero-phase currents of the lines 1L and 2L at the power supply end are I01 and I02, respectively, the distance x from the power supply end to the ground fault point of the 1L line is x = d [2I02 / (I01 + I02)] (d is the distance of the transmission line). The distance x of the 2L line to the ground fault point can be obtained by x = d [2I01 / (I01 + I02)] (d is the distance of the transmission line) (2).
【０００３】後者のインピーダンス方式によれば、短絡
故障相を例えば１Ｌ回線のｉ相、ｊ相とすると、電源端
の相電圧Ｖi，Ｖj、１Ｌ回線の相電流Ii1 ,Ij1、送電線
の単位長さ当たりの正相インピーダンスＺを用いて、電
源端から１Ｌ回線短絡故障点までの距離Ｘは ｘＩｍ［Ｚ］＝Ｉｍ［（Ｖi−Ｖj）／（Ii1−Ij1）］ (3) で求められる。Ｉｍ［…］はリアクタンス成分を表す。According to the latter impedance method, if the short-circuit fault phases are, for example, the i-phase and the j-phase of the 1L line, the phase voltages Vi and Vj at the power supply end, the phase currents Ii1 and Ij1 of the 1L line, and the unit length of the transmission line Using the positive phase impedance Z per unit, the distance X from the power supply end to the 1-L line short-circuit fault point can be obtained by xIm [Z] = Im [(Vi-Vj) / (Ii1-Ij1)] (3). Im [...] represents a reactance component.
【０００４】[0004]
【発明が解決しようとする課題】ところで、分岐のある
平行２回線、すなわち３端子平行２回線送電線におい
て、１本の分岐が他の分岐に比べて短い系統がある。こ
のような系統で、短い分岐を無視して２端子平行２回線
送電線の故障点標定を行うと、短い分岐端に回り込む電
流の影響により誤差が大きく出るという問題がある。従
来から知られている３端子平行２回線送電線の故障点標
定方法を適用することが考えられるが（特開平２−１９
７７９号公報、特開平３−２１１４７６号公報参照）、
これらの方法は、複雑な解法が求められ、ソフトウェア
を組むのに手間と時間がかかるという問題がある。Incidentally, there is a system in which one branch is shorter than the other branches in a parallel two-branch transmission line with three branches, that is, a three-terminal parallel two-line transmission line. In such a system, if the fault location of the two-terminal parallel two-circuit transmission line is performed ignoring the short branch, there is a problem that a large error is caused due to the influence of the current flowing around the short branch end. It is conceivable to apply a conventionally known method for locating a fault on a three-terminal parallel two-circuit transmission line (Japanese Patent Laid-Open No. 2-19).
779, JP-A-3-21476),
These methods have a problem that a complicated solution is required and it takes time and effort to build software.
【０００５】そこで、１本の分岐が他の分岐に比べて短
い場合に、適当な近似を取り入れて、前記(1)式や(2)式
を使うのと同様の手軽さで、かつ、正確に故障点標定結
果を出すことのできる故障点標定方法が求められてい
る。Therefore, when one branch is shorter than the other branches, an appropriate approximation is adopted to make it as simple and accurate as using equations (1) and (2). There is a need for a method of locating a fault that can provide a fault locating result.
【０００６】[0006]
【課題を解決するための手段】本発明の故障点標定方法
は、電源端Ａの１Ｌ回線の零相電流Ｉ01、２Ｌ回線の零
相電流Ｉ02、短い分岐のある負荷端Ｂの２Ｌ回線の零相
電流Ｉ02′に基づいて、式 ｘ＝２ｄ（Ｉ02−Ｉ02′）／（Ｉ01＋Ｉ02） （ｄは分岐点から負荷端Ｃまでの距離）により、分岐点
から、分岐点と負荷端Ｃとの間の１Ｌ回線地絡故障点ま
での距離ｘを求める方法である（請求項１）。The fault locating method according to the present invention comprises a zero-phase current I01 of a 1L line at a power supply terminal A, a zero-phase current I02 of a 2L line, and a zero-point current of a 2L line at a load terminal B having a short branch. Based on the phase current I02 ', the equation x = 2d (I02-I02') / (I01 + I02) (d is the distance from the branch point to the load end C), the distance between the branch point and the load end C is obtained. (Claim 1).
【０００７】２Ｌ回線地絡故障であれば、負荷端Ｂの１
Ｌ回線の零相電流Ｉ01′を用いて、式 ｘ＝２ｄ（Ｉ01−Ｉ01′）／（Ｉ01＋Ｉ02） により、分岐点から、分岐点と負荷端Ｃとの間の２Ｌ回
線地絡故障点までの距離ｘを求めればよい（請求項
２）。前記の各方法によれば、従来の零相電流分流比方
式（(1)(2)式）において、分子のＩ02に代えてＩ02−Ｉ
02′を用い、Ｉ01に代えてＩ01−Ｉ01′を用いている。
この補正により、短い分岐端に回り込む電流の影響を考
慮した、正確な地絡故障点の標定をすることができる。If a 2L line ground fault occurs, one of the load terminals B
Using the zero-phase current I01 'of the L line, the equation x = 2d (I01-I01') / (I01 + I02), from the branch point to the 2L line ground fault point between the branch point and the load end C, The distance x may be obtained (claim 2). According to each of the above methods, in the conventional zero-phase current shunt ratio method (Equations (1) and (2)), I02-I is used instead of I02 of the numerator.
02 ', and I01-I01' is used in place of I01.
With this correction, it is possible to accurately locate the ground fault point in consideration of the influence of the current flowing to the short branch end.
【０００８】また、本発明の故障点標定方法は、電源端
Ａの相電流Ｉi，Ｉj、短い分岐のある負荷端Ｂの相電流
Ｉi′，Ｉj′、線間電圧Ｖij′に基づいて、式 ｙＩｍ［Ｚ］＝Ｉｍ［（Ｖij′）／（Ｉi＋Ｉi′）−
（Ｉj＋Ｉj′）］ （Ｚは回線の正相インピーダンス、ｉ，ｊは三相のうち
いずれかの相を表す。ｉ≠ｊ）により、分岐点から、分
岐点と負荷端Ｃとの間のｉｊ相間短絡故障点までの距離
ｙを求める方法である（請求項３）。Further, the fault point locating method of the present invention is based on the phase currents Ii and Ij at the power supply end A, the phase currents Ii 'and Ij' at the load end B having a short branch, and the line voltage Vij '. yIm [Z] = Im [(Vij ') / (Ii + Ii')-
(Ij + Ij ')] (Z is the positive-phase impedance of the line, i and j represent one of the three phases, i ≠ j), and ij between the branch point and the load end C from the branch point This is a method for determining the distance y to the interphase short-circuit fault point (claim 3).
【０００９】この方法によれば、従来のインピーダンス
方式（(3)式）において、分子のＶi−Ｖj＝Ｖijに代え
て、短い分岐端の線間電圧Ｖij′を用い、電源端の相電
流Ii，Ijに代えて、短い分岐端Ｂの相電流Ｉi′，Ｉj′
を考慮したＩi＋Ｉi′，Ｉj＋Ｉj′を用いている。この
補正により、分岐点の電圧を推定するとともに、短い分
岐端に回り込む電流の影響を考慮して、正確な短絡故障
点の標定をすることができる。According to this method, in the conventional impedance system (Equation (3)), the line voltage Vij 'at the short branch end is used instead of Vi-Vj = Vij of the numerator, and the phase current Ii at the power supply end is used. , Ij instead of the phase currents Ii ', Ij' at the short branch end B.
Ii + Ii 'and Ij + Ij' are used. By this correction, the voltage at the branch point can be estimated, and the short-circuit fault point can be accurately located in consideration of the influence of the current flowing to the short branch end.
【００１０】なお、前記相電流Ii，Ijは、１Ｌ回線の短
絡故障であれば、１Ｌ回線の相電流であり、２Ｌ回線の
短絡故障であれば、２Ｌ回線の相電流である。以上の発
明において、「短い分岐」とは、分岐点と負荷端Ｂとの
距離ｄ2が、分岐点と負荷端Ｃとの距離ｄ3の２％または
それ以下であることをいう（請求項４）。つまり、短い
分岐の距離が、長い方の分岐の距離の１／５０以下であ
る。この２％という値は、後に示すように、３端子平行
２回線を２端子平行２回線に近似するときに、実際の計
算値の誤差が少なく、標定結果に影響がないと考えられ
る値となっている。The phase currents Ii and Ij are the phase currents of the 1L line if the short-circuit fault occurs on the 1L line, and the phase currents of the 2L line if the short-circuit fault occurs on the 2L line. In the above invention, the "short branch" means that the distance d2 between the branch point and the load end B is 2% or less of the distance d3 between the branch point and the load end C (claim 4). . That is, the distance of the short branch is 1/50 or less of the distance of the longer branch. This value of 2% is a value that is considered to have a small error in the actual calculated value and to have no effect on the orientation result when the three-terminal parallel two lines are approximated to the two-terminal parallel two lines, as described later. ing.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施の形態を、添
付図面を参照しながら詳細に説明する。 −地絡故障点標定− 図１は、短い分岐のある３端子平行２回線送電線の回路
図である。送電線の電源端Ａには抵抗接地された電源１
が設置される。電源端Ａには電流検知部２が設置されて
いるとともに、短い分岐の負荷端Ｂにも電流検知部３が
設置されている。Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a circuit diagram of a three-terminal parallel two-circuit transmission line having a short branch. A power supply 1 with a resistance ground is connected to the power supply end A of the transmission line.
Is installed. The current detection unit 2 is installed at the power supply end A, and the current detection unit 3 is also installed at the short branch load end B.
【００１２】電流検知部２と電流検知部３とは、専用回
線４で結ばれていて、電流検知部３の検知データは、電
流検知部２に集約されるようになっている。集約された
データは、パーソナルコンピュータ５に入力され、ここ
で故障点標定演算が行われる。送電線の単位距離あたり
のインピーダンスは、実際には、鉄塔構造の相違により
一様とはいえないが、計算上は平均値を用い、場所によ
らず一様であるとした。The current detector 2 and the current detector 3 are connected by a dedicated line 4, and the detection data of the current detector 3 is collected in the current detector 2. The aggregated data is input to the personal computer 5, where a fault locating operation is performed. Although the impedance per unit distance of the transmission line is not actually uniform due to the difference in the structure of the tower, the average value was used for calculation and was assumed to be uniform regardless of the location.
【００１３】電源端Ａと分岐点Ｔとの距離をｄ1、負荷
端Ｂと分岐点Ｔとの距離をｄ2、負荷端Ｃと分岐点Ｔと
の距離をｄ3とする。電源端Ａでの１Ｌ，２Ｌ回線の測
定電流をそれぞれＩ01，Ｉ02とし、負荷端Ｂでの１Ｌ，
２Ｌ回線の測定電流をそれぞれＩ01′，Ｉ02′とする。
分岐点以遠の負荷端Ｃと分岐点Ｔとの区間に地絡故障が
発生したとし、地絡故障点をＦと表示する。この地絡故
障点Ｆに流入する電流を、図１に符号Ｉfa，Ｉfb，Ｉfc
で示している。電流Ｉfaは、電源端Ａから故障点Ｆに直
接流れる電流、電流Ｉfcは、電源端Ａから負荷端Ｃを経
由して故障点Ｆに流れる電流である。電流Ｉfbは、電源
端Ａから分岐点Ｔ、負荷端Ｂを経由して分岐点Ｔに戻
り、故障点Ｆに流れ込む電流である。図１より、 Ｉ01′＝Ｉfb， Ｉ02′＝−Ｉfb， Ｉ01′＝−Ｉ02′ である。The distance between the power supply end A and the branch point T is d1, the distance between the load end B and the branch point T is d2, and the distance between the load end C and the branch point T is d3. The measured currents of the 1L and 2L lines at the power supply end A are I01 and I02, respectively,
The measured currents of the 2L line are I01 'and I02', respectively.
It is assumed that a ground fault has occurred in the section between the load end C and the branch point T beyond the branch point, and the ground fault point is indicated by F. The current flowing into the ground fault point F is shown by reference numerals Ifa, Ifb, Ifc in FIG.
Indicated by. The current Ifa is a current flowing directly from the power supply terminal A to the failure point F, and the current Ifc is a current flowing from the power supply terminal A to the failure point F via the load terminal C. The current Ifb is a current that returns from the power supply terminal A to the branch point T via the branch point T and the load terminal B, and flows into the fault point F. From FIG. 1, I01 '= Ifb, I02' =-Ifb, I01 '=-I02'.
【００１４】図１の３端子平行２回線送電線の分岐点以
遠の等価回路を、図２に示す。この図２の等価回路の導
き方を、図３を用いて解説する。図３(a)は、３端子回
路を示し、各分岐のインピーダンスをＺ1，Ｚ2，Ｚ3と
する。Ａ端の電圧をＶ1、Ｂ端の電圧をＶ2、分岐端Ｔの
電圧をＶ、分岐端ＴからＣ端に流れる電流をＩとする
と、関係式 Ｖ＝［（Ｖ2Ｚ1＋Ｖ1Ｚ2）／（Ｚ1＋Ｚ2）］−Ｚ1Ｚ2Ｉ
／（Ｚ1＋Ｚ2） が成り立つ。図３(b)に示す２端子回路において、Ａ端
の電圧をＶ′、分岐端Ｔの電圧をＶ、分岐端ＴからＣ端
に流れる電流をＩ、Ａ端と分岐端Ｔとの間のインピーダ
ンスをＺとすると、関係式 Ｖ＝Ｖ′−ＺＩ が成り立つ。両式の、電流Ｉに係る係数を等しいとおけ
ば、 Ｚ＝Ｚ1Ｚ2／（Ｚ1＋Ｚ2）＝１／（１／Ｚ1＋１／Ｚ2） となる。したがって、図３(a)の３端子回路は、図３(b)
に示すように、２端子回路に置き換えられ、この２端子
回路のインピーダンスは、図３(c)に示すように、 （Ｚ1／／Ｚ2）＋Ｚ3 となる。ただし、Ｚ1／／Ｚ2＝１／（１／Ｚ1＋１／Ｚ
2）である。FIG. 2 shows an equivalent circuit beyond the branch point of the three-terminal parallel two-circuit transmission line of FIG. How to derive the equivalent circuit of FIG. 2 will be described with reference to FIG. FIG. 3A shows a three-terminal circuit, and the impedance of each branch is Z1, Z2, Z3. Assuming that the voltage at the terminal A is V1, the voltage at the terminal B is V2, the voltage at the terminal T is V, and the current flowing from the terminal T to the terminal C is I, the relational expression V = [(V2Z1 + V1Z2) / (Z1 + Z2)]- Z1Z2I
/ (Z1 + Z2) holds. In the two-terminal circuit shown in FIG. 3B, the voltage at the terminal A is V ', the voltage at the terminal T is V, the current flowing from the terminal T to the terminal C is I, and the voltage between the terminal A and the terminal T is Assuming that the impedance is Z, the relational expression V = V'-ZI holds. If the coefficients related to the current I in both equations are equal, then Z = Z1Z2 / (Z1 + Z2) = 1 / (1 / Z1 + 1 / Z2). Therefore, the three-terminal circuit of FIG.
As shown in FIG. 3, the circuit is replaced by a two-terminal circuit, and the impedance of this two-terminal circuit is (Z1 // Z2) + Z3, as shown in FIG. However, Z1 // Z2 = 1 / (1 / Z1 + 1 / Z
2).
【００１５】送電線の距離あたりのインピーダンスを一
定としたので、以上のインピーダンスＺをそのまま距離
ｄと読み変えても、前記の等価回路は成り立つ。すなわ
ち、２端子回路の距離ｄは、 ｄ＝（ｄ1／／ｄ2）＋ｄ3 (4) となる。以上の考察から、図１の３端子平行２回線送電
線の等価回路を、図２のように書くことができる。Since the impedance per distance of the transmission line is fixed, the above equivalent circuit is established even if the above impedance Z is read as the distance d. That is, the distance d of the two-terminal circuit is as follows: d = (d1 // d2) + d3 (4) From the above considerations, an equivalent circuit of the three-terminal parallel two-circuit transmission line of FIG. 1 can be written as shown in FIG.
【００１６】ここで、負荷端Ｂと分岐点Ｔとの距離ｄ2
が、距離ｄ1よりも短いとすると、 ｄ1／／ｄ2＝１／（１／ｄ1＋１／ｄ2） ＝ｄ1ｄ2／ｄ1＋ｄ2 ＝ｄ1ｄ2／ｄ1 ＝ｄ2 と近似できる。したがって、 ｄ＝ｄ2＋ｄ3 となるが、距離ｄ2が、距離ｄ3よりも短いとすると、式
はさらに近似でき、 ｄ＝ｄ3 (５) となる。Here, the distance d2 between the load end B and the branch point T
Is shorter than the distance d1, it can be approximated that d1 // d2 = 1 / (1 / d1 + 1 / d2) = d1d2 / d1 + d2 = d1d2 / d1 = d2. Therefore, d = d2 + d3. If the distance d2 is shorter than the distance d3, the equation can be further approximated, and d = d3 (5).
【００１７】ここで、数値により、近似の評価を行う。
ｄ1：ｄ2：ｄ3＝５０：１：５０である場合、(4)式を計
算すると、 ｄ＝（ｄ1／／ｄ2）＋ｄ3＝５０．９８ となる。このｄに対して、(5)式のｄ3は、２％減となっ
ている。従って、この程度ならば、標定結果に大きく影
響を与えないで、(6)式の近似を使うことができる。し
たがって、短い分岐の距離は、長い分岐の距離の２％ま
たはそれ以下であることが好ましい。Here, approximation is evaluated by numerical values.
When d1: d2: d3 = 50: 1: 50, the equation (4) is calculated, and d = (d1 // d2) + d3 = 50.98. With respect to d, d3 in equation (5) is reduced by 2%. Therefore, to this extent, the approximation of equation (6) can be used without significantly affecting the orientation result. Therefore, the distance of the short branch is preferably 2% or less of the distance of the long branch.
【００１８】この図２の２端子平行２回線送電線におけ
る、分岐点Ｔから地絡故障点までの距離ｘは、ｄ＝ｄ3
として、 ｘ＝２ｄ3（Ｉ02＋Ｉ02′）／［（Ｉ01＋Ｉ01′）＋
（Ｉ02＋Ｉ02′）］ で求められる。ここで、前述したように、Ｉ01′＝−Ｉ
02′であるから、 ｘ＝２ｄ3（Ｉ02＋Ｉ02′）／［（Ｉ01＋Ｉ02）］ となる。Ｉ02′は、負の値をとるので、Ｉ02′を絶対値
で書くと、 ｘ＝２ｄ3（Ｉ02−Ｉ02′）／［（Ｉ01＋Ｉ02）］ (６) となる。この(６)式により、既知の値ｄ3、電源端Ａで
の電流測定値Ｉ01，Ｉ02、及び負荷端Ｂでの電流測定値
Ｉ02′に基づいて、分岐点から故障点までの距離ｘを求
めることができる。電源端Ａからの距離であれば、ｘに
ｄ1を加算する。In the two-terminal parallel two-circuit transmission line of FIG. 2, the distance x from the branch point T to the ground fault point is d = d3
X = 2d3 (I02 + I02 ') / [(I01 + I01') +
(I02 + I02 ')]. Here, as described above, I01 '=-I
02 ', x = 2d3 (I02 + I02') / [(I01 + I02)]. Since I02 'takes a negative value, if I02' is written as an absolute value, x = 2d3 (I02-I02 ') / [(I01 + I02)] (6) Based on the known value d3, the current value I01, I02 at the power supply terminal A, and the current measurement value I02 'at the load terminal B, the distance x from the branch point to the fault point is obtained by the equation (6). be able to. If the distance is from the power supply terminal A, d1 is added to x.
【００１９】回線２Ｌに地絡故障が発生した場合は、 ｘ＝２ｄ3（Ｉ01−Ｉ01′）／［（Ｉ01＋Ｉ02）］ (７) となる。次に、分岐点より手前の電源端Ａと分岐点Ｔと
の区間に地絡故障が発生した場合の故障点標定方法を説
明する。この場合は、等価回路は、図４に示すように、
２端子回路に置き換えられる。この２端子回路の導き方
は、図５(a)(b)に示すように、３端子回路の端子Ｂと端
子Ｃとを接続して、２端子回路に置き換える。２端子回
路のインピーダンスは、図４(c)に示すように、 Ｚ1＋（Ｚ2／／Ｚ3） となる。ただし、Ｚ2／／Ｚ3＝１／（１／Ｚ2＋１／Ｚ
3）である。If a ground fault occurs in the line 2L, x = 2d3 (I01-I01 ') / [(I01 + I02)] (7) Next, a fault point locating method when a ground fault occurs in a section between the power supply terminal A and the branch point T before the branch point will be described. In this case, the equivalent circuit is as shown in FIG.
Replaced by a two-terminal circuit. As shown in FIGS. 5A and 5B, this two-terminal circuit is connected by connecting the terminals B and C of the three-terminal circuit and replacing it with a two-terminal circuit. The impedance of the two-terminal circuit is Z1 + (Z2 // Z3) as shown in FIG. However, Z2 // Z3 = 1 / (1 / Z2 + 1 / Z
3).
【００２０】送電線の距離に換算すると、２端子回路の
距離ｄは、 ｄ＝ｄ1＋（ｄ2／／ｄ3） となる。距離ｄ2が距離ｄ3よりも短いとすると、 ｄ＝ｄ1＋ｄ2 と近似でき、さらに、距離ｄ2が距離ｄ1よりも短いとす
ると、 ｄ＝ｄ1 と近似できる。When converted into the distance of the transmission line, the distance d of the two-terminal circuit is as follows: d = d1 + (d2 // d3). If the distance d2 is shorter than the distance d3, it can be approximated as d = d1 + d2, and if the distance d2 is shorter than the distance d1, it can be approximated as d = d1.
【００２１】したがって、電源端Ａから地絡故障点まで
の距離ｘは、ｄ＝ｄ1と書けば、 ｘ＝２ｄ1Ｉ02／（Ｉ01＋Ｉ02） (８) で求められる。回線２Ｌに地絡故障が発生した場合は、 ｘ＝２ｄ1Ｉ01／（Ｉ01＋Ｉ02） (９) となる。Accordingly, if d = d1, the distance x from the power supply terminal A to the ground fault point can be obtained as follows: x = 2d1I02 / (I01 + I02) (8) When a ground fault occurs in the line 2L, x = 2d1I01 / (I01 + I02) (9)
【００２２】−短絡故障点標定− 図６は、短い分岐のある３端子平行２回線送電線の回路
図である。送電線の電源端Ａには電源１が設置されると
ともに、電流電圧検知部２ａが設置され、短い分岐の負
荷端Ｂには電流電圧検知部３ａが設置されている。電流
電圧検知部２ａと電流電圧検知部３ａとは、専用回線４
で結ばれていて、電流電圧検知部３ａの検知データは、
電流電圧検知部２ａに集約されるようになっている。集
約されたデータは、パーソナルコンピュータ５に入力さ
れ、ここで故障点標定演算が行われる。FIG. 6 is a circuit diagram of a three-terminal parallel two-circuit transmission line having a short branch. A power supply 1 is installed at a power supply end A of the transmission line, and a current / voltage detection unit 2a is installed. A current / voltage detection unit 3a is installed at a short branch load end B. The current / voltage detector 2a and the current / voltage detector 3a are connected to a dedicated line 4
And the detection data of the current / voltage detector 3a is
It is arranged to be collected in the current / voltage detector 2a. The aggregated data is input to the personal computer 5, where a fault locating operation is performed.
【００２３】送電線の単位距離あたりのインピーダンス
は、場所によらず一様であるとする。電源端Ａと分岐点
Ｔとの距離をｄ1、負荷端Ｂと分岐点Ｔとの距離をｄ2、
負荷端Ｃと分岐点Ｔとの距離をｄ3とする。電源端Ａで
の１Ｌ回線のａ相電流をＩa，ｂ相電流をＩbとし、線間
電圧をＶabとする。負荷端Ｂでの１Ｌ回線のａ相電流を
Ｉa′，ｂ相電流をＩb′とし、線間電圧をＶab′とす
る。It is assumed that the impedance per unit distance of the transmission line is uniform regardless of the location. The distance between the power supply end A and the branch point T is d1, the distance between the load end B and the branch point T is d2,
The distance between the load end C and the branch point T is d3. The a-phase current of the 1L line at the power supply terminal A is Ia, the b-phase current is Ib, and the line voltage is Vab. The a-phase current of the 1L line at the load end B is Ia ', the b-phase current is Ib', and the line voltage is Vab '.
【００２４】分岐点以遠の負荷端Ｃと分岐点Ｔとの区間
に１Ｌ回線で短絡故障が発生したとし、短絡故障点を×
で表示する。分岐点Ｔからこの短絡故障点×に流入する
電流は、ａ相については、電源端Ａから流れる１Ｌ回線
の電流Ｉaと、負荷端Ｂから流れる１Ｌ回線の電流Ｉa′
との和（Ｉa＋Ｉa′）、ｂ相についてはＩbとＩb′との
和（Ｉb＋Ｉb′）である。図６の３端子平行２回線送電
線の等価回路は、図７に示すとおり２端子平行２回線と
なり、その端子間距離ｄが、ｄ3で近似できることは、
前述したとおりである。It is assumed that a short-circuit fault has occurred in the 1L line in the section between the load terminal C and the branch point T farther than the branch point.
To display. The current flowing from the branch point T to the short-circuit fault point x is, for the phase a, the current Ia of the 1L line flowing from the power supply end A and the current Ia 'of the 1L line flowing from the load end B.
(Ia + Ia '), and for the b-phase, the sum of Ib and Ib' (Ib + Ib '). The equivalent circuit of the three-terminal parallel two-line transmission line in FIG. 6 is a two-terminal parallel two line as shown in FIG. 7, and the distance d between the terminals can be approximated by d3.
As described above.
【００２５】この図７の２端子平行２回線における、分
岐点Ｔから短絡故障点×までの距離ｙは、 ｙＩｍ［Ｚ］＝Ｉｍ［（Ｖab″）／（Ｉa＋Ｉa′）−
（Ｉb＋Ｉb′）］ で求められる。ただし、Ｖab″は、分岐点Ｔにおける線
間電圧である。Ｖab″は直接測定できないので、本発明
においては負荷端Ｂの線間電圧Ｖab′で近似する。この
近似は、負荷端Ｂと分岐点Ｔとの距離（インピーダン
ス）が短いことに基づいている。The distance y from the branch point T to the short-circuit fault point x in the two-terminal parallel two circuit shown in FIG. 7 is yIm [Z] = Im [(Vab ") / (Ia + Ia ')-
(Ib + Ib ')]. However, Vab "is the line voltage at the branch point T. Since Vab" cannot be measured directly, it is approximated by the line voltage Vab 'at the load end B in the present invention. This approximation is based on the fact that the distance (impedance) between the load end B and the branch point T is short.
【００２６】したがって、分岐点Ｔから短絡故障点×ま
での距離ｙは、ｙＩｍ［Ｚ］ ＝Ｉｍ［（Ｖab′）／（Ｉa＋Ｉa′）−（Ｉb＋Ｉb′）］(1０) となる。電源端Ａからの距離であれば、ｙにｄ1を加算
する。次に、分岐点より手前の電源端Ａと分岐点Ｔとの
区間に短絡故障が発生した場合の故障点標定方法を説明
する。Therefore, the distance y from the branch point T to the short-circuit fault point x is yIm [Z] = Im [(Vab ') / (Ia + Ia')-(Ib + Ib ')] (10). If it is a distance from the power supply terminal A, d1 is added to y. Next, a fault point locating method when a short-circuit fault occurs in a section between the power supply terminal A and the branch point T before the branch point will be described.
【００２７】この場合は、等価回路は、図８に示すよう
に、２端子回路に置き換えられる。この２端子回路の導
き方は、図５を用いて説明したとおりである。２端子回
路の距離ｄは、ｄ1と近似できる。したがって、電源端
Ａから短絡故障点までの距離ｙは、 ｙＩｍ［Ｚ］＝Ｉｍ［（Ｖab）／（Ｉa−Ｉb）］ (1１) で求められる。In this case, the equivalent circuit is replaced by a two-terminal circuit as shown in FIG. The method of leading the two-terminal circuit is as described with reference to FIG. The distance d of the two-terminal circuit can be approximated to d1. Therefore, the distance y from the power supply terminal A to the short-circuit fault point is obtained by yIm [Z] = Im [(Vab) / (Ia-Ib)] (11).
【００２８】なお、三線短絡故障の場合は、相間差電流
（Ｉa−Ｉb），（Ｉb−Ｉc），又は（Ｉc−Ｉa）の一番
大きな相の二線短絡故障と考えて、標定する。例えば、
（Ｉa−Ｉb）が一番大きければ、ａｂ相で標定する。In the case of a three-wire short-circuit fault, the fault is determined as a two-wire short-circuit fault of the phase having the largest phase difference current (Ia-Ib), (Ib-Ic), or (Ic-Ia). For example,
If (Ia-Ib) is the largest, standardize in ab phase.
【００２９】[0029]
【実施例】短い分岐のある３端子平行２回線送電線系統
を対象として本発明の故障点標定演算を行った。この系
統は、実際に敷設されている電圧７７ｋＶの、１００Ω
抵抗接地系統であり、電源端Ａと分岐点Ｔとの距離ｄ1
は６．５ｋｍ、負荷端Ｂと分岐点Ｔとの距離ｄ2は０．
０２ｋｍ、負荷端Ｃと分岐点Ｔとの距離ｄ3は１０．５
ｋｍである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The fault locating calculation of the present invention was performed for a three-terminal parallel two-circuit transmission line system having a short branch. This system has a voltage of 77 kV, 100 Ω
It is a resistance grounding system, and the distance d1 between the power supply terminal A and the branch point T
Is 6.5 km, and the distance d2 between the load end B and the branch point T is 0.3 km.
02 km, and the distance d3 between the load end C and the branch point T is 10.5.
km.
【００３０】まず、ＥＭＴＰ(Electromagnetic Transie
nts Program)により故障点を設定して故障解析（シミュ
レーション）を行い、故障電圧、故障電流を求めた。そ
の故障電圧、故障電流を使って、(1)式(2)式を使う従来
の方法と、本発明の故障点標定方法とで故障点を求め、
それぞれ故障解析結果と比較した。First, EMTP (Electromagnetic Transie)
nts Program) to set fault points and perform fault analysis (simulation) to determine fault voltage and fault current. Using the fault voltage and the fault current, a fault point is obtained by the conventional method using the formula (1) and the formula (2) and the fault point locating method of the present invention,
Each was compared with the failure analysis result.
【００３１】[0031]
【表１】 [Table 1]
【００３２】表１は、一線地絡故障の場合を示す。シミ
ュレーション上の故障点は、電源端Ａから７．５５ｋ
ｍ、１１．７５ｋｍ、１５．９５ｋｍの地点とした。故
障相で、「２Ｌ Ｂ，Ｇ」とあるのは、２Ｌ回線のｂ相
が地絡したという意味、「１Ｌ Ｃ，Ｇ」とあるのは、
１Ｌ回線のｃ相が地絡したという意味、「２Ｌ Ａ，
Ｇ」とあるのは、２Ｌ回線のａ相が地絡したという意味
である。演算結果の「補正無」は、前記(1)式を使って
故障点標定をした結果を示し、「補正有」とあるのは、
本発明の(６)式または(７)式を使って故障点標定をした
結果を示す。Table 1 shows the case of a single-line ground fault. The failure point in the simulation is 7.55 k from the power supply terminal A.
m, 11.75 km and 15.95 km. In the failure phase, “2L B, G” means that the b phase of the 2L line is grounded, and “1L C, G” means
Meaning that the c phase of the 1L line was grounded, "2L A,
“G” means that the a-phase of the 2L line is grounded. `` No correction '' of the calculation result indicates the result of fault location using the equation (1), and `` with correction '' means
The result of fault location using Equation (6) or (7) of the present invention is shown.
【００３３】補正無の結果によれば、分岐点以遠に故障
点があっても、分岐点よりも手前と計算してしまうが、
本発明によれば、分岐点以遠の故障点を極めて精度よく
標定している。According to the result without correction, even if there is a fault point beyond the branch point, the fault point is calculated before the branch point.
According to the present invention, fault points beyond the branch point are located with extremely high accuracy.
【００３４】[0034]
【表２】 [Table 2]
【００３５】表２は、二線または三線短絡故障の場合を
示す。シミュレーション上の故障点は、電源端Ａから
７．５５ｋｍ、１１．７５ｋｍ、１５．９５ｋｍの地点
とした。故障相で、「２Ｌ Ｃ−Ａ，Ｓ」とあるのは、
２Ｌ回線のａ相とｃ相が短絡したという意味、「１Ｌ
Ａ−Ｂ，Ｓ」とあるのは、１Ｌ回線のａ相とｂ相が短絡
したという意味、「２Ｌ Ａ−Ｂ−Ｃ，Ｓ」とあるの
は、２Ｌ回線のａ，ｂ，ｃの３相が短絡したという意味
である。Table 2 shows the case of a two-wire or three-wire short-circuit fault. The failure points in the simulation were 7.55 km, 11.75 km, and 15.95 km from the power supply terminal A. In the failure phase, "2L CA, S" is
"1L" means that the phases a and c of the 2L line are short-circuited.
“AB, S” means that the a-phase and b-phase of the 1L line are short-circuited, and “2L ABC, S” means that 3 is the a, b, c of the 2L line. This means that the phases have short-circuited.
【００３６】演算結果の「補正無」は、前記(1０)式を
使って故障点標定をした結果を示し、「補正有」とある
のは、本発明の式を使って故障点標定をした結果を示
す。補正無の結果によれば、故障点を実際より遠く計算
してしまうが、本発明によれば、分岐点以遠の故障点を
極めて精度よく標定している。"No correction" in the calculation result indicates the result of fault location using the equation (10), and "corrected" means that the fault location was performed using the formula of the present invention. The results are shown. According to the result without correction, the fault point is calculated farther than the actual point. However, according to the present invention, the fault points beyond the branch point are located with extremely high accuracy.
【００３７】[0037]
【発明の効果】以上のように本発明の故障点標定方法に
よれば、電源端の電流を測定するとともに、短い分岐端
の電流を測定することにより、簡単な演算により、分岐
点以遠の一線地絡故障点を正確に標定することができ
る。また、本発明の故障点標定方法によれば、電源端の
電流を測定するとともに、短い分岐端の電流、電圧を測
定することにより、簡単な演算により、分岐点以遠の短
絡故障点を正確に標定することができる。As described above, according to the fault locating method of the present invention, the current at the power supply end is measured and the current at the short branch end is measured. The ground fault point can be accurately located. According to the fault point locating method of the present invention, the current at the power supply end is measured, and the current and voltage at the short branch end are measured. Can be oriented.
【図１】地絡故障点標定に用いる、短い分岐のある３端
子平行２回線送電線の回路図である。FIG. 1 is a circuit diagram of a short-branched three-terminal parallel two-circuit transmission line used for ground fault fault location.
【図２】３端子平行２回線送電線の分岐点以遠の２端子
等価回路図である。FIG. 2 is a two-terminal equivalent circuit diagram of a three-terminal parallel two-circuit transmission line beyond a branch point;
【図３】図２の等価回路の導き方を解説するための図で
ある。FIG. 3 is a diagram for explaining how to derive the equivalent circuit of FIG. 2;
【図４】分岐点より手前で地絡故障が発生した場合の２
端子等価回路図である。FIG. 4 illustrates a case where a ground fault occurs before a branch point.
It is a terminal equivalent circuit diagram.
【図５】図４の等価回路の導き方を解説するための図で
ある。FIG. 5 is a diagram for explaining how to derive the equivalent circuit of FIG. 4;
【図６】短絡故障点標定に用いる、短い分岐のある３端
子平行２回線送電線の回路図であるFIG. 6 is a circuit diagram of a three-terminal parallel two-circuit transmission line with short branches used for short-circuit fault point location.
【図７】図６の３端子平行２回線送電線の２端子等価回
路である。FIG. 7 is a two-terminal equivalent circuit of the three-terminal parallel two-circuit transmission line of FIG. 6;
【図８】分岐点より手前で短絡故障が発生した場合の２
端子等価回路である。FIG. 8 illustrates a case where a short-circuit failure occurs before a branch point.
It is a terminal equivalent circuit.
１ 電源 ２ 電流検知部 ２ａ 電流電圧検知部 ３ 電流検知部 ３ａ 電流電圧検知部 ４ 専用回線 ５ パーソナルコンピュータ DESCRIPTION OF SYMBOLS 1 Power supply 2 Current detection part 2a Current voltage detection part 3 Current detection part 3a Current voltage detection part 4 Dedicated line 5 Personal computer
Claims (4)
法であって、 電源端Ａの１Ｌ回線の零相電流Ｉ01、２Ｌ回線の零相電
流Ｉ02、短い分岐のある負荷端Ｂの２Ｌ回線の零相電流
Ｉ02′に基づいて、式 ｘ＝２ｄ（Ｉ02−Ｉ02′）／（Ｉ01＋Ｉ02） （ｄは分岐点から負荷端Ｃまでの距離）により、分岐点
から、分岐点と負荷端Ｃとの間の１Ｌ回線地絡故障点ま
での距離ｘを求めることを特徴とする、分岐のある平行
２回線の故障点標定方法。1. A fault point locating method for two parallel lines having a short branch, comprising: a zero-phase current I01 of a 1L line at a power supply terminal A, a zero-phase current I02 of a 2L line, and a 2L of a load terminal B having a short branch. Based on the zero-phase current I02 'of the line, the equation x = 2d (I02-I02') / (I01 + I02) (d is the distance from the branch point to the load end C). And determining a distance x to a 1L line ground fault point between the two points.
法であって、 電源端Ａの１Ｌ回線の零相電流Ｉ01、２Ｌ回線の零相電
流Ｉ02、短い分岐のある負荷端Ｂの１Ｌ回線の零相電流
Ｉ01′に基づいて、式 ｘ＝２ｄ（Ｉ01−Ｉ01′）／（Ｉ01＋Ｉ02） （ｄは分岐点から負荷端Ｃまでの距離）により、分岐点
から、分岐点と負荷端Ｃとの間の２Ｌ回線地絡故障点ま
での距離ｘを求めることを特徴とする、分岐のある平行
２回線の故障点標定方法。2. A fault locating method for two parallel lines having a short branch, comprising: a zero-phase current I01 of a 1L line of a power supply terminal A, a zero-phase current I02 of a 2L line, and a 1L of a load terminal B having a short branch. Based on the zero-phase current I01 'of the line, the equation x = 2d (I01-I01') / (I01 + I02) (d is the distance from the branch point to the load end C) And determining a distance x to a 2L line ground fault point between the two points.
法であって、 電源端Ａの相電流Ｉi，Ｉj、短い分岐のある負荷端Ｂの
相電流Ｉi′，Ｉj′、線間電圧Ｖij′に基づいて、式 ｙＩｍ［Ｚ］＝Ｉｍ［（Ｖij′）／（Ｉi＋Ｉi′）−
（Ｉj＋Ｉj′）］ （Ｚは回線の正相インピーダンス、ｉ，ｊは三相のうち
いずれかの相を表す。ｉ≠ｊ）により、分岐点から、分
岐点と負荷端Ｃとの間のｉｊ相間短絡故障点までの距離
ｙを求めることを特徴とする、分岐のある平行２回線の
故障点標定方法。3. A method for locating a fault in two parallel lines having short branches, comprising: phase currents Ii and Ij at a power supply end A, phase currents Ii 'and Ij' at a load end B having a short branch, and line voltage. Based on Vij ', the expression yIm [Z] = Im [(Vij') / (Ii + Ii ')-
(Ij + Ij ')] (Z is the positive-phase impedance of the line, i and j represent one of the three phases, i ≠ j), and ij between the branch point and the load end C from the branch point A method for locating a fault point of two parallel lines having a branch, wherein a distance y to an interphase short-circuit fault point is obtained.
と負荷端Ｃとの距離ｄ3の２％またはそれ以下であるこ
とを特徴とする請求項１、請求項２または請求項３記載
の故障点標定方法。4. A distance d2 between a branch point and a load end B is equal to or less than 2% of a distance d3 between a branch point and a load end C. 3. The failure point locating method described in 3.
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| JP2000229487A JP2002040085A (en) | 2000-07-28 | 2000-07-28 | Method for locating fault point of branched parallel dual line |
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|---|---|---|---|
| JP2000229487A JP2002040085A (en) | 2000-07-28 | 2000-07-28 | Method for locating fault point of branched parallel dual line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907677A (en) * | 2010-07-02 | 2010-12-08 | 华北电力大学 | High voltage cable-overhead line hybrid line fault phase ranging method |
| JP2012191779A (en) * | 2011-03-11 | 2012-10-04 | Meidensha Corp | Voltage controller of power distribution system |
| JP2015148610A (en) * | 2014-02-07 | 2015-08-20 | 三菱電機株式会社 | Method and system for determining location of fault in ungrounded power distribution system |
-
2000
- 2000-07-28 JP JP2000229487A patent/JP2002040085A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907677A (en) * | 2010-07-02 | 2010-12-08 | 华北电力大学 | High voltage cable-overhead line hybrid line fault phase ranging method |
| JP2012191779A (en) * | 2011-03-11 | 2012-10-04 | Meidensha Corp | Voltage controller of power distribution system |
| JP2015148610A (en) * | 2014-02-07 | 2015-08-20 | 三菱電機株式会社 | Method and system for determining location of fault in ungrounded power distribution system |
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