JPH0283467A - Apparatus for detecting distribution line accident section - Google Patents

Abstract

PURPOSE:To detect an earth accident place using a small-sized detector by mounting a current transformer to an overhead earth wire. CONSTITUTION:Distribution lines U, V, W of respective phases are arranged to utility poles 1 and lightning overhead earth wire 2 is applied to the upper end parts of the utility poles 1. A current transformer (CT)3 as a sensor for detecting a phase current is provided to either one of the phases of the wiring section An of distribution lines U, V, W and a CT 7 is provided to the lightning overhead earth wire 2. A judge circuit 4 for judging an earth direction on the basis of the detected phase current and earth current is connected to both of the CT 3 and the CT 7 and the currents are transmitted to a monitor station through a communication apparatus 6 and a communication line 5. The magnitude of the earth current detected by the CT 7 becomes large toward an accident point and the phase difference between the currents by the CTs 3, 7 is reversed between the upstream and downstream parts of the accident point and, therefore, this phenomenon is utilized to make it possible to judge the accident point.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は配電線の事故区間を検出する配電線事故区間検
出装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a distribution line accident section detection device for detecting an accident section of a distribution line.

［従来の技術］ 現在、広く行なわれている地絡検出方法としては、各相
の配電線Ｕ、Ｖ、Ｗに変流器（以下ＣＴという）をそれ
ぞれ取着し、地絡事故が生じた場合各ＣＴの出力の和に
よって零相電流を検出したり、零相電流変成器（以下Ｚ
ＣＴという）にて零相電流を検知することにより地絡を
検出するものであった。[Prior art] Currently, a widely used method for detecting ground faults is to install current transformers (hereinafter referred to as CTs) on the distribution lines U, V, and W of each phase to detect ground faults. In this case, the zero-sequence current can be detected by the sum of the outputs of each CT, or the zero-sequence current transformer (hereinafter referred to as Z
Ground faults were detected by detecting zero-sequence current using a CT.

［発明が解決しようとする課題１ ところが、上記の地絡検出方法においてはＣＴを配電線
の各相毎に取着したり、ＺＣＴを各相に対して一括して
取付けたりしているため、ＣＴおよびＺＣＴ自身に高い
絶縁性を持たせる必要があり、ＣＴあるいはＺＣＴが大
形化し、配電線に対する取付作業に手間がかかるという
問題がある。[Problem to be Solved by the Invention 1] However, in the above ground fault detection method, CTs are attached to each phase of the distribution line, or ZCTs are attached to each phase all at once. It is necessary for the CT and ZCT themselves to have high insulation properties, resulting in a problem that the CT or ZCT becomes large and the installation work to the distribution line takes time and effort.

また、地絡方向を判別する方法としては零相電流と零相
電圧を検知することにより地絡事故点が検出地点から電
源側か負荷側かを判別するようにしたものもある。零相
電圧を検出するには一般にはコンデンサ形の電圧検出器
（零相電圧検出器）が使用されているが、これは大形で
あり、しかも、配電線に取付ける必要があるため取付け
が面倒な問題がある。Furthermore, as a method for determining the direction of a ground fault, there is a method in which it is determined whether the ground fault point is on the power supply side or the load side from the detection point by detecting zero-sequence current and zero-sequence voltage. A capacitor-type voltage detector (zero-sequence voltage detector) is generally used to detect zero-sequence voltage, but this is large and requires installation on the distribution line, making installation difficult. There is a problem.

本発明の目的は上記の問題を解決するために、高い絶縁
性を持たせる必要がなく、小形のＣＴを使用することが
でき、しかも地絡方向性も検出することのできる事故区
間検出装置を提供することにある。The purpose of the present invention is to solve the above problems by providing an accident section detection device that does not require high insulation, can use a small CT, and can also detect ground fault directionality. It is about providing.

［課題を解決するための手段］ 上記の目的を達成するため本願第１の発明は、配電線に
沿って配置した架空地線に対し、配電線の各配置を線区
間に対応して事故電流を検出する事故電流検出センサを
配置したことをその要旨とする。[Means for Solving the Problems] In order to achieve the above object, the first invention of the present application provides an overhead ground wire disposed along a distribution line, in which each arrangement of the distribution line is adjusted according to the fault current The gist is that a fault current detection sensor has been installed to detect fault current.

第２の発明は配電線に沿って配置した架空地線に対し事
故電流検出センサを配置し、配電線のいずれかの相に対
し相電流検出センサを設け、事故電流検出センサおよび
電流検出センサが検出した検出データを親局に対して送
信する送信手段を設けたごとをその要旨とする。In the second invention, a fault current detection sensor is arranged for an overhead ground wire arranged along a distribution line, a phase current detection sensor is provided for any phase of the distribution line, and the fault current detection sensor and the current detection sensor are arranged. The gist is that a transmitting means is provided to transmit the detected data to the master station.

［作用］ したがって第１の発明は、配？ｒｆＩ！ｉｌの区間にて
事故が発生すると架空地線に地絡電流が流れ、事故電流
検出センサはこの地絡電流を検知する。[Operation] Therefore, the first invention is a distribution system. rfI! When an accident occurs in the section il, a ground fault current flows through the overhead ground wire, and the fault current detection sensor detects this ground fault current.

第２の発明は、配電線にて事故が発生すると架空地線お
よび配電線に地絡電流が流れ、事故電流検出センサはこ
の事故電流を検知する。また、電流検出センサは相電流
を検出する。そして、送信手段は事故電流検出センサお
よび電流検出センサが検出した検出データをＦＡ８へ送
信する。In the second invention, when an accident occurs in a power distribution line, a ground fault current flows through the overhead ground wire and the power distribution line, and a fault current detection sensor detects this fault current. Further, the current detection sensor detects phase current. Then, the transmitting means transmits the detection data detected by the fault current detection sensor and the current detection sensor to the FA8.

［実施例１ 以下、本発明を具体化した一実施例を図面に従って説明
する。[Example 1] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

第１図に示すように、電柱１には各相の配電線Ｕ、Ｖ、
Ｗが配線されるとともに、前記電柱１の上端部には大地
に接地された避雷用架空地線２が配線されている。As shown in Fig. 1, the utility pole 1 has distribution lines U, V, and
W is wired, and an overhead ground wire 2 for lightning protection is wired to the upper end of the utility pole 1, which is grounded to the earth.

配電線Ｕ、Ｖ、Ｗの配電線区間、Ａ、ｎ（ｎ−１゜２・
・・）いずれかの相には相電流を検知するセンサとして
の変流器（以下、ＣＴという）３が取着されている。さ
らに、ＣＴ３に対応して架空地ｍ２には、地絡事故時に
流れる地絡電流を検知するセンサとしての変流器（ＣＴ
）７が取着されている。Distribution line sections of distribution lines U, V, W, A, n (n-1゜2・
...) A current transformer (hereinafter referred to as CT) 3 is attached to one of the phases as a sensor for detecting phase current. Furthermore, corresponding to CT3, a current transformer (CT
)7 is attached.

各ＣＴ３．７には検知した相電流ならびに地絡電流に基
づいて地絡方向を判別する判別回路４が撥続され、その
判別結果は図示しない監視所へ送信手段としての通信装
は６および通信ｌ！！５を介して送信される。A discrimination circuit 4 for discriminating the ground fault direction based on the detected phase current and ground fault current is connected to each CT 3.7, and a communication device 6 and communication device 6 serve as means for transmitting the discrimination results to a monitoring station (not shown). l! ! 5.

第２図において左側がｍｉ側、右側が負荷側としたとき
、配電線Ｗの点Ｆｌ、：おいて地絡事故が生じた場合の
架空地線２に流れる地絡電流の特性を第３図に示す。こ
の特性は、電源側から事故箇所に近づくほど正方向に流
れる地絡電流が増加し、事故箇所を境に負荷側から事故
箇所に近づくほど逆方向に流れる地格電流が増加する。In Fig. 2, when the left side is the mi side and the right side is the load side, Fig. 3 shows the characteristics of the ground fault current flowing through the overhead ground wire 2 when a ground fault occurs at point Fl of the distribution line W. Shown below. This characteristic is that the ground fault current flowing in the positive direction increases as the fault location approaches from the power source side, and the ground fault current flowing in the reverse direction increases as the fault location approaches the fault location from the load side.

架空地線２に取着されたＣＴ７の判別回路４はこの地絡
？ｌ流によってＣＴ７に誘導Ｗｉ流が発生し、この電流
の大きさ、ＣＴ７とＣＴ３の誘導電流の位相差、通信装
置６を介して得られる配電用変電所（図示しない）での
零相電圧とＣＴ７との設置された相の電流の位相差に基
づいて地絡電流の大きさ、極性を判別する。そして、事
故の配電線区間へ〇＋１よりも電源側または負荷側で生
じたのかを判別するようになっている。Is the CT7 discrimination circuit 4 attached to the overhead ground wire 2 due to this ground fault? An induced Wi current is generated in CT7 by the I current, and the magnitude of this current, the phase difference between the induced currents of CT7 and CT3, and the zero-sequence voltage at the distribution substation (not shown) obtained via the communication device 6 The magnitude and polarity of the ground fault current are determined based on the phase difference between the installed phase current and the CT7. Then, it is determined whether the accident occurred on the power supply side or the load side from 〇+1 to the distribution line section where the accident occurred.

次に、上記のように構成された配電線事故区間検出装置
の作用・効果について説明する。Next, the functions and effects of the distribution line accident section detection device configured as described above will be explained.

さて、第１図の配電線Ｕ、Ｖ、ＷのうちＷ相の点Ｆにお
いて地絡事故が生じた場合、架空地線２に取着されてい
る各ＣＴ７が地絡電流を検知する。Now, when a ground fault occurs at point F of the W phase among the distribution lines U, V, and W in FIG. 1, each CT 7 attached to the overhead ground wire 2 detects the ground fault current.

そのため、事故箇所よりもＴ＠電源側ある判別回路４は
前述した第３図に示す特性により、地絡事故点が負荷側
にあることを判別する。そして、事故箇所よりも負荷側
にある判別回路４は地絡事故点が２！源側にあることを
判別する。これらの結果を通信装置ｔ６および通信線５
を介して図示しない監視所へ送信する。よって、監視所
は前記架空地線２に流れる地絡電流の方向の反転する配
電線区間Ａｈを見つけ出し地絡事故箇所を知ることがで
きる。その結果、ＣＴ７自身には高い絶縁性を持たせる
必要がないため、小形のＣＴを使用することができ、従
って取付作業は簡単に行なうことができる。Therefore, the determination circuit 4 located on the T@power supply side of the fault location determines that the ground fault fault point is on the load side based on the characteristics shown in FIG. 3 described above. The discrimination circuit 4 located on the load side of the accident point has two ground fault points! Determine whether it is on the source side. These results are sent to the communication device t6 and the communication line 5.
The information is sent to a monitoring station (not shown) via the . Therefore, the monitoring station can find the distribution line section Ah where the direction of the ground fault current flowing through the overhead ground wire 2 is reversed and know the location of the ground fault accident. As a result, since the CT 7 itself does not need to have high insulation properties, a small CT can be used, and therefore the installation work can be easily performed.

なお、この実施例では各配電線Ｕ、Ｖ、Ｗのいずれかに
もＣＴ３を取着したが必ずしも取着する必要はない。In this embodiment, the CT3 is attached to any one of the distribution lines U, V, and W, but it is not necessary to attach it to any one of the distribution lines U, V, and W.

本実施例はおいては、ＣＴ３．７を取付け、通信装置６
を介して図示しない監視所へ送信するように構成したが
、次のように構成することも可能である。In this embodiment, CT3.7 is installed and communication device 6 is installed.
Although the configuration is such that the data is transmitted to a monitoring station (not shown) via the following, the following configuration is also possible.

第６図に示すように、各配電線区間Ａ毎に一対のＣＴ７
を互いに差動結合した事故電流検出センサＣＴａ　、Ｃ
Ｔｂ等を取着する。そして、これら事故電流検出センサ
ＣＴａ　、ＣＴｂを判別回路４に接続する。As shown in Figure 6, a pair of CT7 is provided for each distribution line section A.
Fault current detection sensors CTa and C are differentially coupled to each other.
Attach Tb etc. These fault current detection sensors CTa and CTb are connected to the discrimination circuit 4.

よって、互いのＣＴ７の区間以外で地絡事故が生じた場
合、架空地線２に流れる地絡電流は事故電流検出センサ
ＣＴｂにおけるＣＴ７では同一方向となるため差動結合
された互いのＣＴ７に発生する誘導１！流は互いに異方
向となって打ち消し合う。そのため、判別回路４に流入
する誘導電流はほぼ零に近い小さな値となる。しかし、
事故電流検出センサＣＴａの一対の０７７間の区間内で
地絡事故が生じた場合、その箇所の地絡電流は、地絡点
を境いに双方に流れるため、差動結合された互いのＣＴ
７に発生する誘導電流はそれぞれ同方向となって重り合
う。そのため、判別回路４に流入する誘導電流は大きい
値となる。これにより、地絡事故が生じたことを知るこ
とができる。Therefore, if a ground fault occurs in a section other than the CT7 of each other, the ground fault current flowing to the overhead ground wire 2 will be in the same direction in the CT7 of the fault current detection sensor CTb, so that it will occur in each differentially coupled CT7. Induction 1! The flows go in different directions and cancel each other out. Therefore, the induced current flowing into the discrimination circuit 4 has a small value close to zero. but,
If a ground fault occurs within the section between a pair of fault current detection sensors CTa, the ground fault current at that location will flow in both directions with the ground fault point as a boundary, so the differentially coupled CT
The induced currents generated in 7 are in the same direction and overlap each other. Therefore, the induced current flowing into the discrimination circuit 4 has a large value. This makes it possible to know that a ground fault has occurred.

また、通信装置６を使用して集中監視する他、ＣＴ７自
身に事故表示機能を設けることも可能である。In addition to intensive monitoring using the communication device 6, it is also possible to provide the CT 7 itself with an accident display function.

さらに、配電ｍｕ、ｖ、ｗに流れる相電流の誘導により
電流が架空地線２に流れる。ＣＴ７はこの電流を検知し
判別回路４が誤判別をするおそれがある。よって、この
ような電流によってＣＴ７が検知した検知信号を打消す
補正回路を判別回路４に設けてもよい。Further, current flows through the overhead ground wire 2 due to induction of phase currents flowing through the power distribution mu, v, and w. There is a possibility that the CT 7 detects this current and the discrimination circuit 4 makes an erroneous discrimination. Therefore, the discrimination circuit 4 may be provided with a correction circuit that cancels the detection signal detected by the CT 7 using such a current.

［発明の効果］ 以上詳述したように本発明においては、架空地線にＣＴ
を取着することにより、地絡事故箇所を検知することが
できる。その結果、ＣＴに高い絶縁性を持たせる必要が
ないため小形のＣＴを使用することができ、従って取付
作業は簡単に行うことができる。[Effects of the Invention] As detailed above, in the present invention, CT is applied to the overhead ground wire.
By attaching this, it is possible to detect the location of a ground fault. As a result, it is not necessary to provide the CT with high insulation properties, so a small CT can be used, and therefore the installation work can be performed easily.

また、送信手段を設けることにより集中監視することが
できる。Further, by providing a transmitting means, centralized monitoring can be performed.

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

第１図は本発明に係る配電線の構成図、第２図は地絡事
故が発生した場合における事故電流の流れを示す図、第
３図は地絡事故が発生したとき架空地線に流れる事故電
流を示す特性図、第４図は本発明に係る別例を示す構成
図である。 ２・・・架空地線、３・・・相電流検出センサとしての
ＣＴ、６・・・送信手段としての通信装置、７・・・事
故電流検出センサとしてのＣＴ、Ｕ、Ｖ、Ｗ・・・配電
線、Ａ・・・配電線区間。 特許出願人　　　日本碍子　株式会社Figure 1 is a configuration diagram of the distribution line according to the present invention, Figure 2 is a diagram showing the flow of fault current when a ground fault occurs, and Figure 3 is a diagram showing the flow of fault current in the overhead ground wire when a ground fault occurs. A characteristic diagram showing fault current, FIG. 4 is a configuration diagram showing another example according to the present invention. 2... Overhead ground wire, 3... CT as a phase current detection sensor, 6... Communication device as a transmission means, 7... CT as a fault current detection sensor, U, V, W... - Distribution line, A... Distribution line section. Patent applicant Nippon Insulator Co., Ltd.

Claims (1)

【特許請求の範囲】 １、配電線（Ｕ、Ｖ、Ｗ）に沿って配置した架空地線（
２）に対し、配電線（Ｕ、Ｖ、Ｗ）の各配電線区間（Ａ
）に対応して事故電流を検出する事故電流検出センサ（
７）を配置したことを特徴とする配電線事故区間検出装
置。 ２、配電線（Ｕ、Ｖ、Ｗ）に沿って配置した架空地線（
２）に対し事故電流検出センサ（７）を配置し、配電線
（Ｕ、Ｖ、Ｗ）のいずれかの相に各相に対し相電流検出
センサ（３）を設け、事故電流検出センサ（７）および
電流検出センサ（３）が検出した検出データを親局に対
して送信する送信手段（６）を設けたことを特徴とする
配電線事故区間検出装置。[Claims] 1. Overhead ground wire (
2), each distribution line section (A
Fault current detection sensor (
7) A distribution line fault section detection device characterized by having the following. 2. Overhead ground wire (
A fault current detection sensor (7) is arranged for each phase of the distribution line (U, V, W), and a fault current detection sensor (7) is arranged for each phase of the distribution line (U, V, W). ) and a transmission line (6) for transmitting detection data detected by the current detection sensor (3) to a master station.