JP2855828B2 - Ground fault section detector - Google Patents
Ground fault section detectorInfo
- Publication number
- JP2855828B2 JP2855828B2 JP22332090A JP22332090A JP2855828B2 JP 2855828 B2 JP2855828 B2 JP 2855828B2 JP 22332090 A JP22332090 A JP 22332090A JP 22332090 A JP22332090 A JP 22332090A JP 2855828 B2 JP2855828 B2 JP 2855828B2
- Authority
- JP
- Japan
- Prior art keywords
- ground fault
- zero
- phase
- voltage
- detecting means
- 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.)
- Expired - Fee Related
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Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、配電線の途中に複数個設けた検出器によ
り、配電線の地絡地点とその方向を検出する地絡区間検
出装置に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground fault section detecting device that detects a ground fault point and its direction of a distribution line by using a plurality of detectors provided in the middle of the distribution line. It is.
［従来の技術］ 従来、配電線は主に非接地三相三線式により需要家へ
電力を供給しいる。そのため、配電線は大地から浮いた
状態、すなわち絶縁された状態にされている。ところ
が、碍子の劣化、断線、樹木の接触などの理由により大
地への絶縁が破壊され、地絡と呼ばれる状態となること
がある。これを放置しておくと、三相のうちの健全相の
大地電圧が上昇し、配電機器へ悪影響を及ぼすので、こ
の状態を速やかに検出し、地絡状態を除く必要がある。[Prior Art] Conventionally, power is supplied to consumers mainly by an ungrounded three-phase three-wire system. Therefore, the distribution line is in a state of floating from the ground, that is, in an insulated state. However, insulation to the ground may be destroyed due to deterioration of the insulator, disconnection, contact of trees, and the like, and a state called a ground fault may occur. If this is left unchecked, the ground voltage of the healthy phase of the three phases rises and adversely affects the distribution equipment, so it is necessary to detect this state promptly and eliminate the ground fault state.
この地絡検出方法として一般的な方法は、第３図に示
すように、配電線の途中に零相変流器（ZCT）および零
相分圧器（ZPD）を備えた地絡検出器を用いて零相電圧V
0と零相電流I0を検出している。As a general method for detecting this ground fault, as shown in FIG. 3, a ground fault detector provided with a zero-phase current transformer (ZCT) and a zero-phase voltage divider (ZPD) in the distribution line is used. And zero-phase voltage V
0 and zero-phase current I 0 are detected.
この場合、第４図に示すように、地絡方向は零相電圧
V0を基準に零相電流I0が90゜位相が進めば地絡検出器よ
り負荷側で地絡が発生したものと判定し、逆に90゜位相
が遅れれば地絡検出器より電源側で地絡が発生したもの
と判定している。ただし、零相電圧V0と零相電流I0の位
相方向は変電所のリレーの極性と一致させるものとす
る。In this case, as shown in FIG.
If the zero- phase current I 0 advances by 90 ° phase with respect to V 0 , it is determined that a ground fault has occurred on the load side from the ground fault detector. It is determined that a ground fault has occurred. However, the phase direction of the zero-phase voltage V 0 the zero-phase current I 0 is assumed to match the polarity of the relay of the substation.
このような地絡検出器を内蔵した開閉器を配電線の途
中の数か所に設置し、地絡検出間の地絡区間を検出し、
切離しが行われる。Switches equipped with such a ground fault detector are installed at several places in the middle of the distribution line to detect a ground fault section between ground fault detections,
Separation is performed.
［発明が解決しようとする課題］ 上記方法では、第３図に示すように、電源方向が定ま
っている場合は不都合はないが、配電系統が変更可能な
場合、例えば負荷側と電源側に逆になったときには地絡
の検出方向が逆になるという問題があった。[Problem to be Solved by the Invention] In the above method, as shown in FIG. 3, there is no inconvenience when the power supply direction is fixed, but when the power distribution system can be changed, for example, reverse to the load side and the power supply side , There is a problem that the ground fault detection direction is reversed.
例えば、第５図に示すように、変電所Ａから電力を供
給している状態で検出器を内蔵した開閉器ａとｂの間で
地絡が発生した場合、開閉器ａが検出する。零相電流I0
は零相電流V0に対し進みの状態となる。この場合、開閉
器ｃは投入状態、開閉器ｄは開放状態である。For example, as shown in FIG. 5, when a ground fault occurs between the switches a and b each having a built-in detector while power is supplied from the substation A, the switch a detects. Zero-phase current I 0
Are advanced with respect to the zero-phase current V 0 . In this case, the switch c is in a closed state, and the switch d is in an open state.
一方、変電所Ｂから電力を供給する場合、同一地点で
地絡が発生したとすると、開閉器ａが検出する零相電流
I0は零相電圧V0に対し遅れの状態となる。すなわち、地
絡地点が同一であっても、電力の供給方向によって検出
する零相電流I0と零相電圧V0の位相は全く逆になる。On the other hand, when power is supplied from the substation B, if a ground fault occurs at the same point, the zero-phase current
I 0 is delayed with respect to the zero-phase voltage V 0 . That is, even in the land絡地point are the same, the power zero-phase current I 0 and zero-phase sequence voltage V 0 which phase detected by the supply direction is totally reversed.
したがって、地絡方向を矢印で表示する場合など、逆
の地絡方向を示すおそれがあった。Therefore, when the ground fault direction is indicated by an arrow, the reverse ground fault direction may be indicated.
また、検出器を内蔵した開閉器を電柱に装着する場
合、開閉器の電源側または負荷側を指定して装着しなけ
ればならないため、装着に手間がかかるとともに、配電
系統の変更に時間がかかるなどの欠点があった。In addition, when installing a switch with a built-in detector on a utility pole, it is necessary to specify the power supply side or load side of the switch, and it is time-consuming to mount it, and it takes time to change the distribution system. There were drawbacks such as.
本発明は、設置場所および開閉器の電源側、負荷側を
指定することなく、また配電系統が切り替わった場合な
どの外部要因にかかわらず、検出器を内蔵した開閉器か
らの出力により地絡方向を特定できる地絡区間検出装置
を提供することを目的とするものである。The present invention does not specify the installation location and the power side and load side of the switch, and regardless of external factors such as when the distribution system is switched, the ground fault direction is obtained by the output from the switch with the built-in detector. It is an object of the present invention to provide a ground fault section detection device capable of specifying a ground fault section.
［課題を解決するための手段］ 本発明は、開閉器内に設けられた回動接点および固定
接点にそれぞれ接続された配電線の零相電圧および零相
電流を検出して地絡区間を検出する地絡区間検出装置に
おいて、前記配電線の零相電圧と零相電流との位相差か
ら地絡方向を検出する地絡方向検出手段と、前記配電線
の線間電圧と前記線電流との位相差から負荷の方向を検
出する負荷方向検出手段とを設け、前記地絡方向検出手
段の出力と負荷方向検出手段の出力との論理積により地
絡の方向性信号を出力するようにした論理積手段を備え
たものである。Means for Solving the Problems The present invention detects a zero-phase voltage and a zero-phase current of a distribution line connected to a rotating contact and a fixed contact provided in a switch to detect a ground fault section. In the ground fault section detecting device, a ground fault direction detecting means for detecting a ground fault direction from a phase difference between a zero-phase voltage and a zero-phase current of the distribution line, and a line-to-line voltage of the distribution line and the line current. A load direction detecting means for detecting a direction of the load from the phase difference, and outputting a ground fault direction signal by a logical product of an output of the ground fault direction detecting means and an output of the load direction detecting means. It has a stacking means.
また、前記配電線の高圧導体外周部に円心円状の非接
地の複数の金属導体を設け、前記金属導体に静電誘導で
誘起する零相電圧および線間電圧を光電圧センサにより
検出するものである。Also, a plurality of non-ground metal conductors having a concentric circle shape are provided on the outer periphery of the high-voltage conductor of the distribution line, and a zero-phase voltage and a line voltage induced in the metal conductor by electrostatic induction are detected by an optical voltage sensor. Things.
［作用］ 零相電圧と零相電流との位相差から地絡方向を検出す
る地絡方向検出手段の出力と、線間電圧と線電流との位
相差から負荷の方向を検出する負荷方向検出手段の出力
との論理積を取ることにより、配電系統の電源側が切り
替わっても、検出器を内蔵した開閉器の地絡方向を示す
出力は常に実際の地絡発生方向を示すことができる。[Operation] The output of the ground fault direction detecting means for detecting the ground fault direction from the phase difference between the zero-phase voltage and the zero-phase current, and the load direction detection for detecting the load direction from the phase difference between the line voltage and the line current. By taking the logical product with the output of the means, even if the power supply side of the distribution system is switched, the output indicating the ground fault direction of the switch incorporating the detector can always indicate the actual ground fault generation direction.
［実施例］ 本発明を図に示す実施例について説明する。[Embodiment] An embodiment of the present invention shown in the drawings will be described.
第１図は本発明の実施例を示す構成図で、開閉器１は
SF6ガスが封入されている密閉容器11の中に３相の可動
接点２（2u,2v,2w）、および固定接点３（3u,3v,3w）を
備え、外部から３相の配電線４（4u,4v,4w）、４′
（４′u,4′v,4′ｗ）がそれぞれ可動接点２および固定
接点３に接続されている。また、密閉容器11の中には線
間電圧Ｖを検出する電圧計51、線電流Ｉを検出する電流
計52、零相電圧V0を検出する電圧計53、零相電流I0を検
出する電流計54が設けられて検出部５を構成している。
配電線４から線間電圧Ｖ、零相電圧V0を検出する場合、
配電線４の高圧導体外周部に同心円状の非接地の金属導
体51a,53aを設け、金属導体51a,53aに静電誘電で誘起す
る電圧を検出するようにしてある。そして、電圧計51、
電流計52、電圧計53、電流計54は光センサによって構成
され、それぞれの出力は密閉容器11のガラス窓12の外側
に設けられたコリメータレンズ55（55V,55I,55V0,55
I0）を介して光ファイバケーブル56により光電変換器６
に送られ、電気信号に変換されてその出力は信号処理部
７により処理されて地絡方向を検出するようにしてあ
る。FIG. 1 is a block diagram showing an embodiment of the present invention.
A three-phase movable contact 2 (2u, 2v, 2w) and a fixed contact 3 (3u, 3v, 3w) are provided in an airtight container 11 in which SF 6 gas is sealed. (4u, 4v, 4w), 4 '
(4'u, 4'v, 4'w) are connected to the movable contact 2 and the fixed contact 3, respectively. Further, to detect a voltmeter 51, an ammeter 52 for detecting a line current I, the voltage meter 53 for detecting the zero-phase voltage V 0, the zero-phase current I 0 of detecting the line voltage V is in the sealed container 11 The detection unit 5 is provided with an ammeter 54.
When detecting the line voltage V and the zero-phase voltage V 0 from the distribution line 4,
Concentric non-grounded metal conductors 51a and 53a are provided on the outer periphery of the high-voltage conductor of the distribution line 4 to detect a voltage induced by electrostatic induction in the metal conductors 51a and 53a. And voltmeter 51,
Ammeter 52, a voltmeter 53, the ammeter 54 is constituted by an optical sensor, a collimator lens 55 provided on the outside of the respective output is a glass window 12 of the sealed container 11 (55V, 55I, 55V 0 , 55
I 0 ) through the optical fiber cable 56 and the photoelectric converter 6
Is converted to an electric signal, and the output is processed by the signal processing unit 7 to detect the direction of the ground fault.
信号処理部７は第２図に示すように、線間電圧Ｖ（電
圧計51の出力）と線電流Ｉ（電流計52の出力）との位相
差から負荷の方向を検出する負荷方向検出手段71と、零
相電圧V0（電圧計53の出力）と零相電流I0（電流計54の
出力）との位相差から地絡方向を検出する地絡方向検出
手段72を備え、負荷方向検出手段71と地絡方向検出手段
２の出力の論理積が論理積手段73により地絡の方向性出
力として出力される。As shown in FIG. 2, the signal processing unit 7 detects a load direction from a phase difference between the line voltage V (output of the voltmeter 51) and the line current I (output of the ammeter 52). And a ground fault direction detecting means 72 for detecting a ground fault direction from a phase difference between a zero-phase voltage V 0 (output of the voltmeter 53) and a zero-phase current I 0 (output of the ammeter 54). The logical product of the outputs of the detecting means 71 and the ground fault direction detecting means 2 is output by the logical product means 73 as the directional output of the ground fault.
具体的動作を第５図に示した配電線の開閉器ａとｂの
間で地絡が発生した場合について説明する。A specific operation will be described for a case where a ground fault occurs between the switches a and b of the distribution line shown in FIG.
開閉器からみて変電所Ｂ側で地絡が発生すると、零相
電圧V0と零相電流I0との位相差は＋90゜となり、地絡方
向検出手段72からの信号レベルは＋5V（DC）を出力す
る。開閉器からみて変電所Ａ側で地絡が発生すると、零
相電圧V0と零相電流I0との位相差は−90゜となり、地絡
方向検出手段72からの信号レベルは−5V（DC）を出力す
る。When a ground fault occurs on the substation B side as viewed from the switch, the phase difference between the zero-phase voltage V 0 and the zero-phase current I 0 becomes + 90 °, and the signal level from the ground fault direction detecting means 72 is +5 V (DC). Is output. When a ground fault occurs on the substation A side as viewed from the switch, the phase difference between the zero-phase voltage V 0 and the zero-phase current I 0 becomes −90 °, and the signal level from the ground fault direction detecting means 72 becomes −5 V ( DC).
変電所Ａから電力を供給している場合、（開閉器ｃを
投入し、開閉器ｄを開放している場合）の検出結果と方
向性出力は第１表に示すように、開閉器ａでは零相電圧
V0と零相電流I0との位相差θ０は＋90゜、線間電圧Ｖと
線電流Ｉとの位相差θの符号は＋となり、地絡方向検出
手段72からの信号レベルは＋5V（DC）を出力する。負荷
方向検出手段71の出力は＋となって論理積手段73により
＋5V（開閉器ａからみて右側で、この場合負荷側地絡）
を出力する。When the power is supplied from the substation A, the detection result and the directional output (when the switch c is turned on and the switch d is opened) are as shown in Table 1, and the switch a has Zero-phase voltage
The phase difference θ 0 between V 0 and the zero-phase current I 0 is + 90 °, the sign of the phase difference θ between the line voltage V and the line current I is +, and the signal level from the ground fault direction detecting means 72 is +5 V ( DC). The output of the load direction detecting means 71 becomes + and becomes +5 V by the AND means 73 (on the right side when viewed from the switch a, in this case, the load side ground fault).
Is output.
開閉器ｂでは零相電圧V0と零相電流I0との位相差θ０
は−90゜、線間電圧Ｖと線電流Ｉとの位相差θの符号は
＋となり、地絡方向検出手段72からの信号レベルは−5V
（DC）を出力する。負荷方向検出手段71の出力は＋とな
って論理積手段73により−5V（開閉器ｂからみて左側
で、この場合電源側地絡）を出力する。The phase difference of the switch b in the zero-phase voltage V 0 and the zero-phase current I 0 theta 0
Is −90 °, the sign of the phase difference θ between the line voltage V and the line current I is +, and the signal level from the ground fault direction detecting means 72 is −5 V
(DC) is output. The output of the load direction detecting means 71 becomes +, and the AND means 73 outputs -5 V (on the left side as viewed from the switch b, in this case, a power supply side ground fault).
同様に、変電所Ｂから電力を供給している場合、（開
閉器ｃを開放し、開閉器ｄを投入している場合）の検出
結果と方向性出力は第２表に示すように、開閉器ａでは
＋5V（開閉器ａからみて右側で、この場合電源側地
絡）、開閉器ｂでは−5V（開閉器ｂからみて左側で、こ
の場合負荷側地絡）を出力する。 Similarly, when power is supplied from the substation B, the detection result and the directional output (when the switch c is open and the switch d is closed) are as shown in Table 2, The switch a outputs + 5V (on the right side when viewed from the switch a, in this case, the power supply side ground fault), and the switch b outputs -5V (on the left side from the switch b, in this case, the load side ground fault).
上記のように、地絡方向検出手段の出力と負荷方向検
出手段の出力との論理積を取ることにより、配電系統の
電源側が切り替わっても、地絡検出器を内蔵した開閉器
の地絡方向を示す出力は常に実際の地絡発生方向を示す
ことができる。 As described above, by taking the logical product of the output of the ground fault direction detecting means and the output of the load direction detecting means, even if the power supply side of the distribution system is switched, the ground fault direction of the switch incorporating the ground fault detector is changed. Can always indicate the actual direction of ground fault occurrence.
［発明の効果］ 以上述べたように、本発明によれば、設置場所および
開閉器の電源側、負荷側を指定することなく、また配電
系統が切り替わった場合などの外部要因にかかわらず常
に実際の地絡発生方向を示すことができるので、開閉器
の装着に手間がかからず、地絡方向を間違いなく特定で
きる地絡区間検出装置を提供できる効果がある。[Effects of the Invention] As described above, according to the present invention, the actual location is always specified without specifying the installation location and the power supply side and load side of the switch, and regardless of external factors such as when the distribution system is switched. Since the direction in which the ground fault occurs can be indicated, there is an effect that it is possible to provide a ground fault section detecting device which does not require installation of the switch and can specify the ground fault direction without fail.
第１図は本発明の実施例を示す構成図、第２図は信号処
理部の構成を示すブロック図、第３図、第５図は配電線
の構成図、第４図は零相電圧と零相電流の位相差を示す
説明図である。 １……開閉器、11……密閉容器、12……ガラス窓、４…
…配電線、５……検出部、51、53……電圧計、52、54…
…電流計、55……コリメータレンズ、56……光ファイバ
ケーブル、６……光電変換器、７……信号処理部、71…
…負荷方向検出手段、72……地絡方向検出手段、73……
論理積手段FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a signal processing unit, FIGS. 3 and 5 are block diagrams of a distribution line, and FIG. FIG. 4 is an explanatory diagram showing a phase difference of a zero-phase current. 1 ... Switch, 11 ... Closed container, 12 ... Glass window, 4 ...
... Distribution line, 5 ... Detector, 51, 53 ... Voltmeter, 52, 54 ...
... ammeter, 55 ... collimator lens, 56 ... optical fiber cable, 6 ... photoelectric converter, 7 ... signal processing unit, 71 ...
... Load direction detecting means, 72 ... Ground direction detecting means, 73 ...
AND means
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H02H 3/08 - 3/52 G01R 31/08──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) H02H 3/08-3/52 G01R 31/08
Claims (2)
接点にそれぞれ接続された配電線の零相電圧および零相
電流を検出して地絡区間を検出する地絡区間検出装置に
おいて、 前記配電線の零相電圧と零相電流との位相差から地絡方
向を検出する地絡方向検出手段と、 前記配電線の線間電圧と前記線電流との位相差から負荷
の方向を検出する負荷方向検出手段とを設け、 前記地絡方向検出手段の出力と負荷方向検出手段の出力
との論理積により地絡の方向性信号を出力するようにし
た論理積手段を備えたことを特徴とする地絡区間検出装
置。1. A ground fault section detection device for detecting a ground fault section by detecting a zero-phase voltage and a zero-phase current of a distribution line connected to a movable contact and a fixed contact provided in a switch, respectively. Ground fault direction detecting means for detecting a ground fault direction from a phase difference between a zero-phase voltage and a zero-phase current of the distribution line; and detecting a load direction from a phase difference between a line voltage of the distribution line and the line current. A load direction detecting means, and a logical product means for outputting a directional signal of a ground fault by a logical product of an output of the ground fault direction detecting means and an output of the load direction detecting means. Ground fault section detection device.
非接地の複数の金属導体を設け、前記金属導体に静電誘
導で誘起する零相電圧および線間電圧を光電圧センサに
より検出する請求項１記載の地絡区間検出装置。2. An optical voltage sensor comprising: a plurality of ungrounded metal conductors having a concentric circle shape provided on an outer peripheral portion of a high-voltage conductor of the distribution line; and a zero-phase voltage and a line voltage induced by electrostatic induction in the metal conductor. The ground fault section detection device according to claim 1, wherein the detection is performed by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22332090A JP2855828B2 (en) | 1990-08-24 | 1990-08-24 | Ground fault section detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22332090A JP2855828B2 (en) | 1990-08-24 | 1990-08-24 | Ground fault section detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04105514A JPH04105514A (en) | 1992-04-07 |
| JP2855828B2 true JP2855828B2 (en) | 1999-02-10 |
Family
ID=16796308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22332090A Expired - Fee Related JP2855828B2 (en) | 1990-08-24 | 1990-08-24 | Ground fault section detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2855828B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19721366A1 (en) * | 1997-05-22 | 1998-11-26 | Bosch Gmbh Robert | Circuit for testing serial circuit comprising switch and load |
-
1990
- 1990-08-24 JP JP22332090A patent/JP2855828B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04105514A (en) | 1992-04-07 |
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