JP3530240B2 - Power cable fault section indicator - Google Patents
Power cable fault section indicatorInfo
- Publication number
- JP3530240B2 JP3530240B2 JP32453594A JP32453594A JP3530240B2 JP 3530240 B2 JP3530240 B2 JP 3530240B2 JP 32453594 A JP32453594 A JP 32453594A JP 32453594 A JP32453594 A JP 32453594A JP 3530240 B2 JP3530240 B2 JP 3530240B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- power cable
- fault
- failure
- determination circuit
- 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 - Lifetime
Links
Landscapes
- Locating Faults (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電力ケーブルが損傷等
により故障したことを表示する電力ケーブル故障区間表
示器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power cable failure section indicator for indicating that a power cable has failed due to damage or the like.
【０００２】[0002]
【従来の技術】近年の電力に対する依存度の増大、およ
び需要家設備の高度化に伴い、安定した電力の供給が必
要である。2. Description of the Related Art With the increasing dependence on electric power and the sophistication of consumer facilities in recent years, stable electric power supply is required.
【０００３】電力を送電する電力ケーブルは、絶縁劣化
等により漏電が生じることがあった。A power cable for transmitting electric power sometimes leaks due to insulation deterioration or the like.
【０００４】電力ケーブル３０は、図６に示すように、
絶縁劣化等により故障点４が生じると、故障電流３が心
線１からシース２に故障点４を通じて流れ込む。故障電
流３は、故障点４から大地に向かって流れ、さらにシー
ス２末端の接地線５を介して大地に流れて漏電する。電
流が漏電した場合には、早期復旧が必要である。このた
め、電力ケーブル３０の故障区間を早期に、簡単明瞭
に、かつ確実に発見できる装置が望まれていた。The power cable 30, as shown in FIG.
When a failure point 4 occurs due to insulation deterioration or the like, a failure current 3 flows from the core wire 1 into the sheath 2 through the failure point 4. The fault current 3 flows from the fault point 4 toward the ground, and further flows through the ground wire 5 at the end of the sheath 2 to the ground to cause electric leakage. If the current leaks, early recovery is necessary. For this reason, there has been a demand for a device that can detect a failure section of the power cable 30 early, easily and clearly.
【０００５】電力ケーブル３０の故障区間を発見する装
置としては、図７に示すように、電力ケーブル３０の両
端に電力ケーブル３０の三相分を囲む大型の光変流器３
２・３３を取り付け、光変流器３２・３３をそれぞれ送
電器３６・３７に接続し、送電器３６・３７に光ケーブ
ル３４を介して接続された故障区間標定器３５があっ
た。この故障区間標定器３５は、電力ケーブル３０の三
相の電流の和を検出して故障電流３の有無を確認するこ
とにより、電力ケーブル３０に故障区間があるかどうか
を判定するまた電力ケーブル３０の故障区間を発見する
装置としては、図８に示すように、電力ケーブル３０に
付設された接地線５に変流器６を介して取り付けられ、
予め検出電流レベルが設定された検出器３９があった。
この検出器３９はシースに流れ込む故障電流３を検出し
て、電力ケーブル３０に故障区間があるかどうかを判定
する。As a device for finding a faulty section of the power cable 30, as shown in FIG. 7, a large-sized optical current transformer 3 surrounding the three phases of the power cable 30 at both ends of the power cable 30.
Install the 2-33, the optical current transformer 32, 33 connected to respective power transmitting device 36, 37, there is transmission 36, 37 the fault section locating device 35 connected via the optical cable 34 to. The failure section locator 35 determines whether there is a failure section in the power cable 30 by detecting the sum of the three-phase currents of the power cable 30 and checking for the presence of the failure current 3. As a device for finding the faulty section of, as shown in FIG. 8, it is attached to the ground wire 5 attached to the power cable 30 through the current transformer 6,
There was a detector 39 whose detection current level was set in advance.
The detector 39 detects the fault current 3 flowing into the sheath and determines whether the power cable 30 has a fault section.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、故障区
間標定器３５（図７参照）は、電力ケーブル３０の３相
分を囲む大型の光変流器３２・３３が必要であり、電力
ケーブル３０の両端電流の位相比較をマイクロコンピュ
ータで行っているため、複雑で大型なシステムになって
しまい非常に高価であった。また故障区間標定器３５は
電力ケーブル３０に流れる循環電流や雷サージ電流等を
検出して誤動作してしまうことがあった。However, the fault section locator 35 (see FIG. 7) requires the large-sized optical current transformers 32 and 33 surrounding the three phases of the power cable 30, and the fault of the power cable 30. Since the phase comparison of the currents at both ends is performed by the microcomputer, it becomes a complicated and large system, which is very expensive. Further, the fault section locator 35 sometimes detects a circulating current or a lightning surge current flowing in the power cable 30 and malfunctions.
【０００７】また検出器３９（図８参照）は、故障電流
３を簡易に検出可能であるが、故障電流３が必ずしもシ
ースを通して接地線に流れるだけでなく、他の箇所へ故
障電流３が分流するため、検出電流のレベル設定が困難
であり、そのため誤動作も多かった。さらに長尺の電力
ケーブル３０の場合には接地線５の接地が一箇所だけで
ないので、故障電流３が接地線５に分流し、故障電流３
が検出器３９を取り付けた接地線５に流れる比率がさら
に不安定となり、故障の検出が困難であった。短尺の電
力ケーブル３０でも両端で接地線５が接地されている場
合は、同様に故障の検出が困難であった。The detector 39 (see FIG. 8) can easily detect the fault current 3, but not only the fault current 3 flows to the ground line through the sheath, but also the fault current 3 is shunted to other places. Therefore, it is difficult to set the level of the detection current, which often causes malfunctions. Further, in the case of the long power cable 30, since the ground wire 5 is not grounded at only one place, the fault current 3 is shunted to the ground line 5 and the fault current 3
The ratio of the current flowing to the ground wire 5 to which the detector 39 is attached becomes more unstable, and it is difficult to detect the failure. Even in the short power cable 30, if the ground wire 5 is grounded at both ends, it is similarly difficult to detect the failure.
【０００８】本発明は前記の課題を解決するためなされ
たもので、電力ケーブルに故障が発生した際、故障電流
のみを確実に検出して故障区間を表示し、無電源で小型
で安価な電力ケーブル故障区間表示器を提供することを
目的とする。The present invention has been made to solve the above-mentioned problems. When a failure occurs in a power cable, only the failure current is reliably detected and the failure section is displayed. An object is to provide a cable fault section indicator.
【０００９】[0009]
【００１０】前記の目的を達成するためになされた本発
明の電力ケーブル故障区間表示器２０は、図３に示すよ
うに、電力ケーブル３０（図４参照）に付設されている
１本の接地線１８を隔てた位置で検流する複数の変流器
１５・１６と、変流器１５・１６から出力される電流を
定電圧電流に変換する変換回路７と、変流器１５・１６
で検流した電流３が流れている方向を比較判定して該定
電圧電流を出力する位相判定回路１７と、該定電圧の大
きさおよび該定電圧の生じた時間を予め設定された基準
電圧および基準時間と比較判定して二次電流を発生する
故障判定回路８と、該二次電流をトリガとして視認可能
となる表示部１４とを有する。前記二次電流をトリガと
して電力ケーブル３０の故障区間データを伝送するデー
タ伝送装置を有することが好ましい。The power cable fault section indicator 20 of the present invention made to achieve the above-mentioned object, as shown in FIG. 3, has one ground wire attached to the power cable 30 (see FIG. 4). A plurality of current transformers 15 and 16 for detecting current at positions separated by 18, a conversion circuit 7 for converting the current output from the current transformers 15 and 16 into a constant voltage current, and the current transformers 15 and 16
The phase determination circuit 17 for comparing and determining the flowing direction of the current 3 detected by the step 3 and outputting the constant voltage current, and the magnitude of the constant voltage and the time when the constant voltage is generated are set to a reference voltage set in advance. Further, it has a failure determination circuit 8 that generates a secondary current by comparing and determining with a reference time, and a display unit 14 that is visible by using the secondary current as a trigger. It is preferable to have a data transmission device that transmits the fault section data of the power cable 30 by using the secondary current as a trigger.
【００１１】[0011]
【作用】本発明の電力ケーブル故障区間表示器１０は、
図１に示すように、故障判定回路８に表示部１４を動作
させる基準電圧および基準時間が故障電流３を基準とし
て予め設定されている。このため、片端が接地された電
力ケーブル３０（図２参照）を流れる故障電流３以外の
大地静電容量による電流、雷サージ電流、開閉サージ電
流には反応せず誤動作することがない。The power cable failure section indicator 10 of the present invention is
As shown in FIG. 1, the reference voltage and the reference time for operating the display unit 14 in the failure determination circuit 8 are preset with the failure current 3 as a reference. Therefore, it does not react to the current due to the ground capacitance other than the fault current 3 flowing through the power cable 30 (see FIG. 2) whose one end is grounded, the lightning surge current, and the switching surge current, and does not malfunction.
【００１２】また本発明の電力ケーブル故障区間表示器
２０は、図３に示すように、故障判定回路８に加えて、
位相判定回路１７を使用している。位相判定回路１７は
ダイオード７から出力された接地線１８を流れる電流の
方向がともに大地に向かっているかどうかを判定し、定
電圧電流を出力するようになっている。このため、両端
が接地された電力ケーブル３０（図４参照）を流れる故
障電流３以外の循環電流３８、雷サージ電流、開閉サー
ジ電流には反応せず誤動作することがない。Further, the power cable failure section indicator 20 of the present invention, as shown in FIG.
The phase determination circuit 17 is used. The phase determination circuit 17 determines whether or not the directions of the currents output from the diode 7 and flowing through the ground line 18 are both toward the ground, and outputs a constant voltage current. Therefore, it does not react to the circulating current 38 other than the fault current 3 flowing through the power cable 30 (see FIG. 4) whose both ends are grounded, the lightning surge current, and the switching surge current, and does not malfunction.
【００１３】[0013]
【実施例】以下、本発明の実施例を詳細に説明する。EXAMPLES Examples of the present invention will be described in detail below.
【００１４】図１は、本発明を適用する電力ケーブル故
障区間表示器１０であって、特に片端接地用の電力ケー
ブル故障区間表示器１０の実施例を示すブロック図であ
る。FIG. 1 is a block diagram showing an embodiment of a power cable fault section indicator 10 to which the present invention is applied, particularly a power cable fault section indicator 10 for one-end grounding.
【００１５】同図に示すように、接地線５に取り付けら
れた過飽和コイルからなる変流器６はダイオード７に接
続され、ダイオード７は故障判定回路８に接続されてい
る。故障判定回路８は電熱線１２に接続され、電熱線１
２は表示部１４内のガス発生剤９に接触している。表示
部１４内では、ガス発生剤９とほぼ接する位置に表示器
１３およびデータ伝送装置１１のスイッチ２２が配置さ
れている。故障判定回路８は、ダイオード７から出力さ
れた定電圧の大きさおよび継続時間を予め設定された基
準電圧および基準時間と比較し、比較結果に応じて、電
熱線１２に二次電流を流すようになっている。As shown in the figure, the current transformer 6 formed of a supersaturated coil attached to the ground line 5 is connected to the diode 7, and the diode 7 is connected to the failure determination circuit 8. The failure determination circuit 8 is connected to the heating wire 12 and the heating wire 1
2 is in contact with the gas generating agent 9 in the display unit 14. In the display unit 14, the display 13 and the switch 22 of the data transmission device 11 are arranged at a position substantially in contact with the gas generating agent 9. The failure determination circuit 8 compares the magnitude and duration of the constant voltage output from the diode 7 with a preset reference voltage and reference time, and applies a secondary current to the heating wire 12 according to the comparison result. It has become.
【００１６】故障判定回路８に設定される故障電流３の
基準電圧は、故障電流３の大きさが商用電流の５〜１０
０％の範囲となる電圧に設定され、故障電流３が流れる
基準時間は、数１０ミリ秒〜数１００ミリ秒に設定され
る。このような基準電圧と基準時間としておけば、図５
に示すように、長さ約５００ｍ以下の短尺の電力ケーブ
ル３０を流れる大地静電容量による電流の大きさは商用
電流の０．５％以下であり、雷サージ電流は継続時間が
長くても数ミリ秒であるため、故障電流３以外の電流に
よって故障判定回路８が表示部１４およびデータ伝送装
置１１を作動させることはない。The reference voltage of the failure current 3 set in the failure determination circuit 8 is such that the magnitude of the failure current 3 is 5 to 10 of the commercial current.
The voltage is set to a range of 0%, and the reference time for the fault current 3 to flow is set to several tens of milliseconds to several hundreds of milliseconds. If such a reference voltage and a reference time are used, then FIG.
As shown in, the magnitude of the current due to the ground capacitance flowing through the short-length power cable 30 having a length of about 500 m or less is 0.5% or less of the commercial current, and the lightning surge current is several times even if the duration is long. Since it is millisecond, the failure determination circuit 8 does not operate the display unit 14 and the data transmission device 11 by a current other than the failure current 3.
【００１７】電力ケーブル故障区間表示器１０は、図２
に示すように、電力ケーブル３０のシース２の片端から
接地された接地線５に取り付けて使用する。The power cable fault section indicator 10 is shown in FIG.
As shown in (1), the sheath 2 of the power cable 30 is attached to the ground wire 5 grounded from one end and used.
【００１８】電力ケーブル故障区間表示器１０は、以下
のように動作する。The power cable fault section indicator 10 operates as follows.
【００１９】故障電流３が接地線５を流れると、図１に
示すように、変流器６で電圧が生じ、この電圧はダイオ
ード７で一定の大きさの定電圧電流に変換されて故障判
定回路８に出力される。故障判定回路８に入力した定電
圧電流が基準時間流れ、その定電圧が基準電圧の範囲を
満たす場合には、その定電圧電流は二次電流として電熱
線１２に流される。電熱線１２に二次電流が流れるとガ
ス発生剤９からガスが発生し、その圧力で表示器１３が
押されて視認可能となり故障区間が確認され、同時にデ
ータ伝送装置１１のスイッチ２２が入って電力ケーブル
３０（図２参照）が故障したことを知らせる電波が送信
される。When the fault current 3 flows through the ground line 5, a voltage is generated in the current transformer 6 as shown in FIG. 1, and this voltage is converted into a constant voltage current of a certain magnitude by the diode 7 to determine the fault. It is output to the circuit 8. When the constant voltage current input to the failure determination circuit 8 flows for a reference time and the constant voltage satisfies the range of the reference voltage, the constant voltage current is passed through the heating wire 12 as a secondary current. When a secondary current flows through the heating wire 12, gas is generated from the gas generating agent 9, and the pressure causes the display 13 to be pressed to make it visible and the faulty section is confirmed. At the same time, the switch 22 of the data transmission device 11 is turned on. Radio waves are transmitted to notify that the power cable 30 (see FIG. 2) has failed.
【００２０】図３は、本発明を適用する電力ケーブル故
障区間表示器２０であって、特に両端接地用の電力ケー
ブル故障区間表示器２０の実施例を示すブロック図であ
る。FIG. 3 is a block diagram showing an embodiment of the power cable fault section indicator 20 to which the present invention is applied, particularly the power cable fault section indicator 20 for grounding both ends.
【００２１】同図に示すように、接地線１８に取り付け
られた過飽和コイルからなる変流器１５と、リード線２
１を介して取り付けられた過飽和コイルからなる変流器
１６とはダイオード７に接続され、ダイオード７は位相
判定回路１７に接続されている。位相判定回路１７は変
流器１５・１６で検流された電流がどちらも大地に向か
って流れている場合にはダイオード７から出力された定
電圧電流をそのまま出力するようになっている。As shown in the figure, the current transformer 15 consisting of a supersaturated coil attached to the ground wire 18 and the lead wire 2
The current transformer 16 composed of a supersaturated coil attached via 1 is connected to the diode 7, and the diode 7 is connected to the phase determination circuit 17. The phase determination circuit 17 outputs the constant voltage current output from the diode 7 as it is when the currents detected by the current transformers 15 and 16 both flow toward the ground.
【００２２】位相判定回路１７は電圧およびその継続時
間を予め設定された基準電圧および基準時間と比較する
故障判定回路８に接続されている。故障判定回路８は電
熱線１２に接続され、電熱線１２は表示部１４内のガス
発生剤９に接触している。表示部１４内では、ガス発生
剤９とほぼ接する位置に表示器１３およびデータ伝送装
置１１のスイッチ２２が配置されている。故障判定回路
８は前記比較結果に応じて、電熱線１２に二次電流を流
すようになっている。The phase determination circuit 17 is connected to a failure determination circuit 8 which compares the voltage and its duration with a preset reference voltage and reference time. The failure determination circuit 8 is connected to the heating wire 12, and the heating wire 12 is in contact with the gas generating agent 9 in the display unit 14. In the display unit 14, the display 13 and the switch 22 of the data transmission device 11 are arranged at a position substantially in contact with the gas generating agent 9. The failure determination circuit 8 is adapted to flow a secondary current through the heating wire 12 according to the comparison result.
【００２３】位相判定回路１７は接地線１８を流れたそ
れぞれの故障電流３の方向が同一、すなわちどちらも故
障電流３が大地に向かって流れた場合にのみ、位相判定
回路１７に入力した電流を出力するため、循環電流３８
が流れた場合には故障判定回路８は作動しない。The phase determination circuit 17 supplies the current input to the phase determination circuit 17 only when the directions of the respective fault currents 3 flowing through the ground line 18 are the same, that is, when the fault currents 3 flow toward the ground. Circulating current 38 for output
If the current flows, the failure determination circuit 8 does not operate.
【００２４】電力ケーブル故障区間表示器２０は、図４
に示すように、電力ケーブル３０のシース２の両端から
接地された接地線１８に取り付けて使用する。The power cable fault section indicator 20 is shown in FIG.
As shown in FIG. 5, the power cable 30 is attached to the ground wire 18 grounded from both ends of the sheath 2 for use.
【００２５】電力ケーブル故障区間表示器２０は、以下
のように動作する。The power cable fault section indicator 20 operates as follows.
【００２６】故障電流３が接地線１８を流れると、図３
に示すように、変流器１５、１６で電圧が生じ、これら
の電圧はダイオード７で一定の大きさの定電圧電流に変
換されて位相判定回路１７に出力される。接地線１８を
流れたそれぞれの故障電流３の方向がどちらも大地に向
かって流れている場合には、位相判定回路１７に入力し
た定電圧電流は故障判定回路８に出力される。When the fault current 3 flows through the grounding wire 18, FIG.
As shown in FIG. 5, voltages are generated in the current transformers 15 and 16, and these voltages are converted into a constant voltage current of a constant magnitude by the diode 7 and output to the phase determination circuit 17. When the directions of the fault currents 3 flowing through the ground line 18 are both flowing toward the ground, the constant voltage current input to the phase determination circuit 17 is output to the fault determination circuit 8.
【００２７】故障判定回路８に入力した電流が基準時間
流れ、その定電圧が基準電圧の範囲を満たす場合には、
その電流は二次電流として電熱線１２に流される。電熱
線１２に二次電流が流れるとガス発生剤９からガスが発
生し、その圧力で表示器１３が押されて視認可能となり
故障区間が確認され、同時にデータ伝送回路１１のスイ
ッチ２２が入って電力ケーブル３０（図４参照）が故障
したことを知らせる電波が送信される。When the current input to the failure judgment circuit 8 flows for a reference time and its constant voltage satisfies the range of the reference voltage,
The current is passed through the heating wire 12 as a secondary current. When the secondary current flows through the heating wire 12, gas is generated from the gas generating agent 9, and the pressure causes the display 13 to be pressed to make it visible and the faulty section is confirmed. At the same time, the switch 22 of the data transmission circuit 11 is turned on. Radio waves are transmitted to notify that the power cable 30 (see FIG. 4) has failed.
【００２８】[0028]
【発明の効果】以上、詳細に説明したように本発明の電
力ケーブル故障区間表示器は、無電源で小型で極めて安
価であり、電力ケーブルに故障が発生した際、故障電流
のみを確実に検出して故障区間を表示し、故障電流以外
の外部ノイズ電流に反応して誤動作することがない。し
かも無線または有線によるデータ伝送装置と組み合わせ
ることにより、遠隔地から電力ケーブル故障を検知する
ことができる。このため電力ケーブルの保守管理を極め
て容易に行うことができる。As described above in detail, the power cable fault section indicator of the present invention is small in size and extremely inexpensive with no power supply, and when a fault occurs in the power cable, only the fault current is reliably detected. The failure section is displayed to prevent malfunction due to an external noise current other than the failure current. Moreover, by combining it with a wireless or wired data transmission device, it is possible to detect a power cable failure from a remote location. Therefore, maintenance and management of the power cable can be performed extremely easily.
【図１】本発明を適用する電力ケーブル故障区間表示器
であって、特に片端接地用の電力ケーブル故障区間表示
器の実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a power cable failure section indicator to which the present invention is applied, particularly a power cable failure section indicator for one-end grounding.
【図２】本発明を適用する電力ケーブル故障区間表示器
を、電力ケーブルの片端の接地線に取り付けた状態を示
す図である。FIG. 2 is a diagram showing a state in which a power cable failure section indicator to which the present invention is applied is attached to a ground wire at one end of a power cable.
【図３】本発明を適用する電力ケーブル故障区間表示器
であって、特に両端接地用の電力ケーブル故障区間表示
器の実施例を示すブロック図である。FIG. 3 is a block diagram showing an embodiment of a power cable fault zone indicator to which the present invention is applied, particularly a power cable fault zone indicator for grounding both ends.
【図４】本発明を適用する電力ケーブル故障区間表示器
を、電力ケーブルの両端の接地線に取り付けた状態を示
す図である。FIG. 4 is a diagram showing a state in which a power cable failure section indicator to which the present invention is applied is attached to the ground wires at both ends of the power cable.
【図５】故障電流、大地静電容量による電流、および雷
サージ電流の波形を示す図である。FIG. 5 is a diagram showing waveforms of a fault current, a current due to a ground capacitance, and a lightning surge current.
【図６】電力ケーブルを故障電流が流れる状態を説明す
る図である。FIG. 6 is a diagram illustrating a state in which a fault current flows through a power cable.
【図７】従来の電力ケーブルの故障区間を表示する装置
の例を示す概略図である。FIG. 7 is a schematic diagram showing an example of a device for displaying a faulty section of a conventional power cable.
【図８】従来の電力ケーブルの故障区間を表示する装置
の別の例を示す概略図である。FIG. 8 is a schematic view showing another example of a device for displaying a faulty section of a conventional power cable.
１は心線、２はシース、３は故障電流、４は故障点、５
・１８は接地線、６・１５・１６は変流器、７はダイオ
ード、８は故障区間判定回路、９はガス発生剤、１０・
２０は電力ケーブル故障区間表示器、１１はデータ伝送
回路、１２は電熱線、１３は表示器、１４は表示部、１
７は位相判定回路、２１はリード線、２２はスイッチ、
３０は電力ケーブル、３２・３３は光変流器、３４は光
ケーブル、３５は故障区間標定器、３６・３７は送電
器、３８は循環電流、３９は検出器である。1 is a core wire, 2 is a sheath, 3 is a fault current, 4 is a fault point, 5
・ 18 is a ground wire, 6 ・ 15 ・ 16 is a current transformer, 7 is a diode, 8 is a failure section determination circuit, 9 is a gas generating agent, 10 ・
20 is a power cable failure section display, 11 is a data transmission circuit, 12 is a heating wire, 13 is a display, 14 is a display unit, 1
7 is a phase determination circuit, 21 is a lead wire, 22 is a switch,
30 is a power cable, 32 and 33 are optical current transformers, 34 is an optical cable, 35 is a fault zone locator, 36 and 37 are power transmitters, 38 is a circulating current, and 39 is a detector.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 甲田 利廣 長野県上田市大字五加1291−１ (72)発明者 服部 明朗 愛知県尾張旭市東本地ケ原町２−65 (72)発明者 渡邊 稔 埼玉県川越市的場2202−２ カスミパー クホームズＣ−201 (72)発明者 福井 信孝 石川県松任市福留町857−51 (56)参考文献 特開 平３−186774（ＪＰ，Ａ) 特開 昭63−15618（ＪＰ，Ａ) 実開 平２−41179（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01R 31/08 - 31/11 H02H 7/26 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiro Koda Goka, Ueda City, Nagano 1291-1, Oka, Japan (72) Inventor Akira Hattori 2-65 Higashimotochigaharacho, Owariasahi City, Aichi Prefecture (72) Inventor Minoru Watanabe Saitama Prefecture 2202-2 Matoba, Kawagoe City Kasumi Park Homes C-201 (72) Inventor Nobutaka Fukui 857-51, Fukudome-cho, Matsuto-shi, Ishikawa (56) Reference JP-A-3-186774 (JP, A) JP-A-63-15618 (JP, A) Actual Kaihei 2-41179 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) G01R 31/08-31/11 H02H 7/26
Claims (2)
地線を隔てた位置で検流する複数の変流器と、各変流器
から出力される電流を定電圧電流に変換する変換回路
と、各変流器で検流した電流が流れている方向を比較判
定して該定電圧電流を出力する位相判定回路と、該定電
圧の大きさおよび該定電圧の生じた時間を予め設定され
た基準電圧および基準時間と比較判定して二次電流を発
生する故障判定回路と、該二次電流をトリガとして視認
可能となる表示部とを有することを特徴とする電力ケー
ブル故障区間表示器。1. A plurality of current transformers for detecting current at a position separated from one grounding wire attached to a power cable, and a conversion circuit for converting a current output from each current transformer into a constant voltage current. And a phase determination circuit for comparing and determining the flowing direction of the current detected by each current transformer and outputting the constant voltage current, the magnitude of the constant voltage and the time when the constant voltage is generated are set in advance. Power cable fault section indicator having a failure determination circuit that generates a secondary current by comparing and determining the generated reference voltage and reference time, and a display section that can be visually recognized by using the secondary current as a trigger. .
ルの故障区間データを伝送するデータ伝送装置を有する
ことを特徴とする請求項１に記載の電力ケーブル故障区
間表示器。2. The power cable fault section indicator according to claim 1, further comprising a data transmission device for transmitting fault section data of the power cable by using the secondary current as a trigger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32453594A JP3530240B2 (en) | 1994-12-27 | 1994-12-27 | Power cable fault section indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32453594A JP3530240B2 (en) | 1994-12-27 | 1994-12-27 | Power cable fault section indicator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08178995A JPH08178995A (en) | 1996-07-12 |
| JP3530240B2 true JP3530240B2 (en) | 2004-05-24 |
Family
ID=18166891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32453594A Expired - Lifetime JP3530240B2 (en) | 1994-12-27 | 1994-12-27 | Power cable fault section indicator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3530240B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100555342B1 (en) * | 1998-10-30 | 2006-05-09 | 주식회사신도리코 | How to prevent failure of power drive |
-
1994
- 1994-12-27 JP JP32453594A patent/JP3530240B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08178995A (en) | 1996-07-12 |
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