JPH0644343U - Distribution line protection device - Google Patents
Distribution line protection deviceInfo
- Publication number
- JPH0644343U JPH0644343U JP7705592U JP7705592U JPH0644343U JP H0644343 U JPH0644343 U JP H0644343U JP 7705592 U JP7705592 U JP 7705592U JP 7705592 U JP7705592 U JP 7705592U JP H0644343 U JPH0644343 U JP H0644343U
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- ground fault
- switch
- distribution line
- circuit breaker
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Abstract
(57)【要約】
【目的】 配電系統に地絡事故が発生した場合に、変電
所遮断器の遮断回数を１回だけにして保護動作を確立さ
せるようにする。
【構成】 この考案の配電線保護装置は、いずれかの区
間で地絡事故が発生して変電所の遮断器が遮断動作した
後に再閉路した場合、制御装置が区分開閉器を一定時
間、閉路させて試送電を行なわせ、その間に地絡事故検
出要素によって当該区間に地絡事故が発生していないか
どうか判断し、地絡事故が発生してなければ当該区間に
本送電を行なわせ、他方、当該区間に地絡事故が発生し
ていることが検出されれば、ロック部によって当該区間
への送電ができないように区間開閉器をロックし、保護
するようにしているので、短い試送電動作を繰り返すこ
とによって地絡事故発生区間を特定してその区間以降を
開放することができる。
(57) [Summary] [Purpose] When a ground fault occurs in the distribution system, the number of times the substation circuit breaker is turned off is set only once to establish a protective operation. [Constitution] In the distribution line protection device of the present invention, when a ground fault occurs in any section and the circuit breaker of the substation is closed again after the circuit breaker operates, the control device closes the section switch for a certain period of time. Then, the test transmission is performed, during which the ground fault detection element determines whether or not a ground fault has occurred in the section, and if there is no ground fault, the main transmission is performed in the section. On the other hand, if it is detected that a ground fault has occurred in the section, the section is locked and protected by the lock unit so that power cannot be transmitted to the section. By repeating the operation, the ground fault accident occurrence section can be specified and the section and thereafter can be opened.
Description
【０００１】[0001]
この考案は、配電線を複数の区間に区分し、各区間に地絡事故が発生した場合 にその区間以降の区間への配電を禁止し、配電線を保護する配電線保護装置に関 する。 The present invention relates to a distribution line protection device that divides a distribution line into a plurality of sections, prohibits distribution to sections after the section when a ground fault occurs in each section, and protects the distribution line.
【０００２】[0002]
従来、配電線を複数の区間に区分し、各区間に地絡事故が発生した場合にその 区間以降の区間への配電を禁止し、配電線を保護する配電線保護装置として、図 ５に示す構成のものが知られている。この従来の配電線保護装置は、電磁形の自 動化用配電線開閉器１と制御装置２から構成されている。そして、電磁形の自動 化用配電線開閉器１を制御する方式は、三相交流回路に設けられた自動化用配電 線開閉器１に対して、例えば、電源側のＲ相、Ｓ相間の電圧とその負荷側のＲ相 、Ｔ相間の電圧とがそれぞれ変圧器を介して制御装置２に印加され、制御装置２ は伝送路（図示せず）から与えられる信号、または配電線から加圧される電圧条 件に基づいて、自動化用配電線開閉器１の開閉動作を制御するものである。 Conventionally, distribution lines are divided into multiple sections, and when a ground fault occurs in each section, distribution to the sections after that is prohibited, and a distribution line protection device that protects the distribution line is shown in Fig. 5. The composition is known. This conventional distribution line protection device comprises an electromagnetic type distribution line switch 1 for automation and a control device 2. And, the method of controlling the electromagnetic type distribution line switch 1 for automation is such that the voltage between the R phase and the S phase on the power supply side is compared with the distribution line switch 1 for automation provided in the three-phase AC circuit. And the voltage between the R phase and the T phase on the load side are respectively applied to the control device 2 via the transformer, and the control device 2 is pressurized by the signal given from the transmission line (not shown) or the distribution line. The opening / closing operation of the automation distribution line switch 1 is controlled based on the voltage condition.
【０００３】 この動作についてさらに詳しく説明すると、図４に一般的な配電系統図を示し てあるが、この系統は、配電用変電所３、この変電所３の遮断器３ａ、配電線を 複数の区間Ａ，Ｂ，Ｃ，…に区分し、各区分目ごとに設置されている区分開閉器 ４ａ，４ｂ，…から構成されている。そして、この区分開閉器４ａ，４ｂ，…は いずれも、図５に示した自動化用配電線開閉器１と制御装置２から構成されるも のである。[0003] To explain this operation in more detail, a general distribution system diagram is shown in Fig. 4. This system includes a distribution substation 3, a circuit breaker 3a of this substation 3, and a plurality of distribution lines. It is divided into sections A, B, C, ... And is composed of section switches 4a, 4b ,. Each of the division switches 4a, 4b, ... Is composed of the automation distribution line switch 1 and the control device 2 shown in FIG.
【０００４】 そこで、このような系統において、例えば、区間Ｂに地絡事故が発生した場合 の動作について説明すると、図６のタイムチャートに示すように、平常時には、 遮断器３ａ、区分開閉器４ａ，４ｂ，…は投入状態にあるが、地絡事故が発生す れば、まず遮断器３ａが区間Ｂの事故電流を検出することによって、検出時限ｔ １後に遮断動作する。このとき、区分開閉器４ａ，４ｂ，…は遮断器３ａの開放 によって事故の操作電源を喪失し、無電圧開放する。Therefore, in such a system, for example, the operation when a ground fault occurs in the section B will be described. As shown in the time chart of FIG. 6, the circuit breaker 3a and the section switch 4a are normally operated in normal times. , 4b, ... Are in the closed state, but if a ground fault occurs, first, the circuit breaker 3a detects the fault current in the section B to perform the breaking operation after the detection time period t 1. At this time, the section switches 4a, 4b, ... Lost the operating power source in the accident due to the opening of the circuit breaker 3a, and are opened without voltage.
【０００５】 遮断器３ａは、その後、一定時間ｔ２がたてば再閉路動作を行ない、区分開閉 器４ａは遮断器３ａが投入されたことによって加圧されるようになるが、その電 源側に加圧されたことを条件に、刻時を開始し、投入時限ｔ３後に投入動作を行 ない、投入後、検出時限ｔ４の刻時を開始する。この投入後の検出時限ｔ４は、 その負荷側の区分開閉器の投入時限ｔ３´よりも短い。After that, the circuit breaker 3a recloses after a certain time t2, and the sectional switch 4a is pressurized by the circuit breaker 3a being turned on. On the condition that the pressure is applied to, the clocking is started, the charging operation is performed after the charging time t3, and after the charging, the clocking of the detection time t4 is started. The detection time period t4 after the closing is shorter than the closing time period t3 ′ of the load side section switch.
【０００６】 区分開閉器４ａが投入されることによって、その負荷側が充電され、次の区分 開閉器４ｂも同様に投入されるが、これによって事故区間Ｂに送電されるため、 遮断器３ａは検出時限ｔ１′後に再び遮断動作する。このとき、区分開閉器４ｂ の制御装置はその投入時限ｔ１′中における停電であることを判断し、以後の投 入をロックする。When the section switch 4a is turned on, the load side thereof is charged and the next section switch 4b is also turned on in the same manner, but since it is transmitted to the accident section B by this, the circuit breaker 3a is detected. After the time period t1 ', the cutoff operation is performed again. At this time, the control device of the sorting switch 4b judges that there is a power failure during the closing time t1 'and locks the subsequent injections.
【０００７】 その後、遮断器３ａは一定時間ｔ２′後に再々閉路動作するが、このとき、区 分開閉器４ｂは投入をロックされており、Ｂ区間への送電は行なわず、区分開閉 器４ｂ以降の区間Ｂ，Ｃ，…は事故区間として分離されることになる。After that, the circuit breaker 3a recloses after a certain time t2 ', but at this time, the division switch 4b is closed and the power is not transmitted to the section B. The sections B, C, ... Of will be separated as accident sections.
【０００８】[0008]
ところが、このような従来の配電線保護装置では、区分開閉器は一定の投入時 限ごとに投入されるために、事故点探査から系統分離までの間、区間数分の遅延 があること、さらに配電用変電所の遮断器との協調によって事故区間を分離する ため、図６に示したようにｔ２，ｔ２′の２回の停電が必要となる問題点があっ た。 However, in such a conventional distribution line protection device, since the switchgear is turned on at fixed time intervals, there is a delay of the number of sections from the fault point search to the grid separation. Since the fault section is separated by cooperation with the circuit breaker of the distribution substation, there was a problem that two power outages of t2 and t2 'were required as shown in Fig. 6.
【０００９】 この考案は、このような従来の問題点に鑑みてなされたもので、いずれかの区 間で地絡事故が発生した場合の保護動作において、区分開閉器の投入間隔を短縮 し、停電回数を１回にすることができる配電線保護装置を提供することを目的と する。The present invention has been made in view of such a conventional problem, and shortens the closing interval of the division switch in the protection operation when a ground fault accident occurs in any of the divisions. It is an object of the present invention to provide a distribution line protection device that can reduce the number of power outages to one.
【００１０】[0010]
この考案は、配電線を複数の区間に区分するために配電線の各区分目ごとに設 置された区分開閉器と、この区分開閉器ごとに設けられた当該区分開閉器の開閉 制御をなす制御装置とを備えて成る配電線保護装置において、各制御装置に、区 分開閉器各々の電源側に接続され、地絡事故検出を行なう地絡事故検出要素と、 区分開閉器に所定時間の試送電を行なわせる試送電制御部と、この試送電制御部 による区分開閉器の試送電中に地絡事故検出要素が地絡事故を検出したときに、 区分開閉器が閉路しないようにロックするロック部とを付加したものである。 This invention controls a switching device provided for each division of the distribution line to divide the distribution line into a plurality of sections, and an opening / closing control of the division switch provided for each classification switch. In a distribution line protection device that is equipped with a control device, each control device is connected to the power supply side of each division switch, and a ground fault detection element that detects a ground fault and When the ground fault detection element detects a ground fault during the trial transmission of the trial transmission control unit that performs trial transmission and the trial transmission of the division switch by this trial transmission control unit, locks the division switch so that it does not close. The lock part is added.
【００１１】[0011]
この考案の配電線保護装置では、いずれかの区間で地絡事故が発生して変電所 の遮断器が遮断動作した後に再閉路した場合、制御装置が区分開閉器を一定時間 、閉路させて試送電を行なわせ、その間に地絡事故検出要素によって当該区間に 地絡事故が発生していないかどうか判断し、地絡事故が発生してなければ当該区 間に本送電を行なわせ、他方、当該区間に地絡事故が発生していることが検出さ れれば、ロック部によって当該区間への送電ができないように区間開閉器をロッ クし、保護する。 In the distribution line protection device of the present invention, when a ground fault occurs in any section and the circuit breaker of the substation is closed again after the circuit breaker operates, the control device tries to open the section switch for a certain period of time. Power transmission is performed, during which the ground fault detection element determines whether a ground fault has occurred in the section.If no ground fault has occurred, the main transmission is performed between the sections, while If it is detected that a ground fault has occurred in the section, the section switch is locked and protected so that power cannot be transmitted to the section by the lock part.
【００１２】 こうして、いずれかの区間で地絡事故が発生した場合に、変電所内の遮断器を いったん遮断動作させるが、地絡事故発生区間を検出するために再閉路した後は 、再び遮断動作をしないで地絡事故発生区間を検出してその区間の区間開閉器を 閉路動作しないようにロックし、当該区間以降の区間への送電を停止させる保護 動作を行ない、系統の停電を１回だけにする。[0012] Thus, when a ground fault occurs in any section, the circuit breaker in the substation is once shut off, but after the circuit is reclosed to detect the section where the ground fault has occurred, the shutoff operation is performed again. Without detecting the ground fault accident, it detects the section where the ground fault occurred and locks the section switch of that section so that it does not close, and performs the protective operation to stop the power transmission to the section after the section, and only one power failure of the system occurs. To
【００１３】[0013]
以下、この考案の実施例を図に基づいて詳説する。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
【００１４】 図１はこの考案の一実施例の回路構成を示している。図に示すように、配電用 変電所からの三相交流配電線に対して、各区間の区分目に自動化用配電線開閉器 １が設置され、この自動化用配電線開閉器１の開閉制御を行なうために、制御装 置５が開閉器１ごとに設置されている。また制御装置５には、自動化用配電線開 閉器１の電源側に設けられた零相変流器６からの信号によって地絡事故を検出す る地絡事故検出要素７が設けられている。FIG. 1 shows a circuit configuration of an embodiment of the present invention. As shown in the figure, for the three-phase AC distribution line from the distribution substation, the automation distribution line switch 1 is installed at the section of each section, and the switching control of this automation distribution line switch 1 is performed. In order to do this, a control device 5 is installed for each switch 1. Further, the control device 5 is provided with a ground fault accident detection element 7 that detects a ground fault by a signal from a zero-phase current transformer 6 provided on the power supply side of the automation distribution line breaker 1. .
【００１５】 前述の制御装置５は、各区間の区分目において、電源側のＲ相、Ｓ相間の電圧 とその負荷側のＲ相、Ｔ相間の電圧とがそれぞれ変圧器を介して印加されるよう になっており、伝送路（図示せず）から与えられる信号、または配電線から加圧 される電圧条件に基づいて、自動化用配電線開閉器１の開閉動作を制御するもの であり、図２に詳しく示すように、自動化用配電線開閉器１に所定時間の試送電 を行なわせる試送電制御部５１と、この試送電制御部５１による自動化用配電線 開閉器１の試送電中に地絡事故検出要素７が地絡事故を検出したときに、開閉器 １が閉路しないようにロックするロック部５２と、所定の刻時を行なうタイマ部 ５３と、当該制御装置５の動作を統括すると共に、開閉器１の開閉制御をなす開 閉制御部５４とから構成されている。In the control device 5, the voltage between the R-phase and S-phase on the power supply side and the voltage between the R-phase and T-phase on the load side are respectively applied via the transformers in each section division. It is designed to control the opening / closing operation of the automation distribution line switch 1 based on the signal given from the transmission line (not shown) or the voltage condition applied from the distribution line. As described in detail in 2, the trial transmission control unit 51 that causes the automation distribution line switch 1 to perform trial transmission for a predetermined time, and the ground transmission during the trial transmission of the automation distribution line switch 1 by the trial transmission control unit 51. When the ground fault detection element 7 detects a ground fault, the lock unit 52 that locks the switch 1 so as not to be closed, the timer unit 53 that performs a predetermined time, and the operation of the control device 5 are integrated. Together with the opening and closing that controls the opening and closing of the switch 1. It is composed of a control unit 54.
【００１６】 次に、上記構成の配電線保護装置の動作について説明する。Next, the operation of the distribution line protection device having the above configuration will be described.
【００１７】 配電系統が従来例でも示したように、図４に示す構成であるとし、いま、Ｂ区 間に地絡事故が発生した場合の動作を、図３の示すタイムチャートに基づいて説 明する。ただし、各区分開閉器４ａ，４ｂ，…は、いずれも図１および図２に示 した自動化用配電線開閉器１、制御装置５、変流器６および地絡事故検出要素７ によって構成されるものとする。It is assumed that the power distribution system has the configuration shown in FIG. 4 as shown in the conventional example, and now the operation when a ground fault occurs in the B zone will be explained based on the time chart shown in FIG. Reveal However, each of the section switches 4a, 4b, ... Is constituted by the distribution line switch 1 for automation, the control device 5, the current transformer 6 and the ground fault accident detection element 7 shown in FIGS. I shall.
【００１８】 Ｂ区間の地絡事故が検出されると、配電用変電所３内の遮断器３ａはｔ５後に 遮断動作し、さらに一定時限ｔ６後に再閉路動作する。区分開閉器４ａはその電 源側に加圧されたことを条件に、一定時限ｔ７後に投入し、もしＡ区間に事故が あれば、地絡事故検出要素７の動作によって変電所３の事故検出遮断時間よりも 短い時間ｔ８以内に再開放する。When the ground fault in the section B is detected, the circuit breaker 3a in the distribution substation 3 performs the breaking operation after t5, and the closing circuit 3a recloses after the constant time t6. The section switch 4a is turned on after a certain time t7 on condition that the power source side is pressurized, and if there is an accident in section A, the ground fault accident detection element 7 operates to detect an accident at the substation 3. Reopen within t8, which is shorter than the cutoff time.
【００１９】 この投入、開放動作は、制御装置５の地絡事故検出要素７を動作させるもので 、制御装置５内の試送電制御部５１が開閉器１を一定時限ｔ８だけ閉路させ、そ の間に変流器６からの信号によって地絡事故検出要素７が地絡事故の有無を検出 する（この動作を、試送電と称する）。そこで、もし地絡事故が検出されれば、 ロック部５２によって開閉器１を閉路しないようにロックするが、地絡事故が検 出されなければ開閉制御部５３が開閉器１を閉路動作させて、通常状態（つまり 、本送電）に移ることになる。This closing and opening operation operates the ground fault accident detection element 7 of the control device 5, and the trial power transmission control unit 51 in the control device 5 closes the switch 1 for a fixed time period t8, and then, In the meantime, the ground fault accident detection element 7 detects the presence / absence of a ground fault by a signal from the current transformer 6 (this operation is referred to as trial transmission). Therefore, if a ground fault is detected, the lock unit 52 locks the switch 1 so as not to close it, but if no ground fault is detected, the switching control unit 53 causes the switch 1 to close. , It will shift to the normal state (that is, main power transmission).
【００２０】 そして、いまの場合には、Ａ区間には地絡事故が発生していないために、試送 電の後に開閉器の回路動作がなく、試送電から本送電に直接移り、続く区間Ｂの 電源側が加圧され、これを条件にして、Ｂ区間の制御装置５の試送電制御部５１ が一定時限ｔ７´後に開閉器１を投入して試送電を行なう。このＢ区間では、地 絡事故が発生しているために、試送電中に、地絡事故検出要素７は地絡事故を検 出し、ロック部５２が一定時限ｔ８後に開閉器１を閉路しないようにロックし、 本送電を禁止する。この結果、地絡事故が発生しているＢ区間以降の事故区間に は電源が送電されないように分離されることになる。In this case, since the ground fault has not occurred in the section A, there is no circuit operation of the switch after the trial transmission, and the trial transmission directly shifts to the main transmission to continue the section. The power source side of B is pressurized, and under this condition, the trial power transmission control unit 51 of the control device 5 in the section B turns on the switch 1 after a certain time t7 ′ to perform trial power transmission. In the section B, since a ground fault has occurred, the ground fault detection element 7 detects the ground fault during the trial power transmission, and the lock unit 52 does not close the switch 1 after the fixed time t8. Locked to prohibit the main power transmission. As a result, power will not be transmitted to the accident section after section B where the ground fault occurs, so that the power is not transmitted.
【００２１】 なお、上記の動作において、加圧から試送電までの時限ｔ７は、電源側の他の 区分開閉器が試送電を行なっているときに自己の投入を防ぐためのもので、試送 電によって開閉器が投入している時間よりもわずかに長い程度でよい。In the above operation, the time period t7 from pressurization to trial power transmission is to prevent the other switching device on the power source side from turning on itself during trial power transmission. It may be slightly longer than the time that the switch is energized by electricity.
【００２２】 このようにして、この実施例の配電線保護装置では、地絡事故検出によって変 電所３の遮断器３ａがいったん遮断動作し、その後に再閉路動作した後では、各 区間ごとの制御装置５側で自分の受け持ち区間に試送電を行なって地絡事故を自 分で検出することにより、区分開閉器をロックするようにしているので、再閉路 後に地絡事故を検出することによって遮断器３ａを再び遮断動作させることなく 地絡事故区間以降を開放することができ、遮断器３ａの遮断動作を１回で済ませ ることができ、また、短い試送電の繰り返しによって地絡事故発生区間を探査し 、事故発生区間以降を開放するので、保護動作が短時間に確立できるのである。In this way, in the distribution line protection device of this embodiment, after the circuit breaker 3a of the substation 3 is once interrupted by the detection of the ground fault, and after the circuit is closed again, the The control device 5 performs trial power transmission in its own section to detect the ground fault by itself and locks the classification switch. Therefore, by detecting the ground fault after reclosing, It is possible to open the area after the ground fault accident without opening the circuit breaker 3a again, and it is possible to complete the breaking operation of the circuit breaker 3a only once. Also, by repeating the short trial power transmission, a ground fault accident occurs. Since the section is searched and the section after the accident occurs is opened, the protection operation can be established in a short time.
【００２３】[0023]
以上のようにこの考案によれば、いずれかの区間で地絡事故が発生して変電所 の遮断器が遮断動作した後に再閉路した場合、制御装置が区分開閉器を一定時間 閉路させて試送電を行なわせ、その間に地絡事故検出要素によって当該区間に地 絡事故が発生していないかどうか判断し、地絡事故が発生してなければ当該区間 に本送電を行なわせ、他方、当該区間に地絡事故が発生していることが検出され れば、ロック部によって当該区間への送電ができないように区間開閉器をロック し、保護するようにしているので、短い試送電動作を繰り返すことによって地絡 事故発生区間を特定してその区間以降を開放することができ、短時間のうちに保 護動作を確立することができ、そのために必要な変電所の遮断器の遮断動作を１ 回で済ますことができて、停電回数を１回にすることができる。 As described above, according to the present invention, when a ground fault accident occurs in any section and the circuit breaker of the substation is closed again after the circuit breaker operates, the control device closes the sectional switch for a certain period of time and tries. Power transmission is performed, during which the ground fault detection element determines whether or not a ground fault has occurred in the section.If no ground fault has occurred, the main transmission is performed in the section. If it is detected that a ground fault has occurred in a section, the section switch is locked and protected so that power cannot be transmitted to that section by the lock unit, so a short trial power transmission operation is repeated. By doing so, it is possible to identify the section where the ground fault occurred and open the section after that, and to establish the protection operation in a short time. What you need to do Can, it is possible that the number of power outages at a time.
【図１】この考案の一実施例の回路ブロック図。FIG. 1 is a circuit block diagram of an embodiment of the present invention.
【図２】上記実施例における制御装置の詳しい内部構成
を示す機能ブロック図。FIG. 2 is a functional block diagram showing a detailed internal configuration of a control device in the above embodiment.
【図３】上記実施例の動作を示すタイムチャート。FIG. 3 is a time chart showing the operation of the above embodiment.
【図４】一般的な配電系統を示す系統図。FIG. 4 is a system diagram showing a general power distribution system.
【図５】従来例の回路ブロック図。FIG. 5 is a circuit block diagram of a conventional example.
【図６】従来例の動作を示すタイムチャート。FIG. 6 is a time chart showing the operation of a conventional example.
１ 自動化用配電線開閉器 ３ 変電所 ３ａ 遮断器 ４ａ，４ｂ，… 区分開閉器 ５ 制御装置 ６ 零相変流器 ７ 地絡事故検出要素 ５１ 試送電制御部 ５２ ロック部 ５３ タイマ部 ５４ 開閉制御部 1 Automation distribution line switch 3 Substation 3a Circuit breaker 4a, 4b, ... Division switch 5 Control device 6 Zero-phase current transformer 7 Ground fault accident detection element 51 Test transmission control unit 52 Lock part 53 Timer part 54 Switching control Department
Claims (1)
電線の各区分目ごとに設置された区分開閉器と、前記区
分開閉器ごとに設けられた当該区分開閉器の開閉制御を
なす制御装置とを備えて成る配電線保護装置において、 前記制御装置に、区分開閉器各々の電源側に接続され、
地絡事故検出を行なう地絡事故検出要素と、前記区分開
閉器に所定時間の試送電を行なわせる試送電制御部と、
前記試送電制御部による前記区分開閉器の試送電中に前
記地絡事故検出要素が地絡事故を検出したときに、前記
区分開閉器が閉路しないようにロックするロック部とを
付加して成ることを特徴とする配電線保護装置。1. A division switch installed in each division of the distribution line for dividing the distribution line into a plurality of sections, and opening / closing control of the division switch provided for each of the division switches. A distribution line protection device comprising a control device, wherein the control device is connected to the power source side of each of the section switches,
A ground fault accident detection element for detecting a ground fault accident, and a trial power transmission control unit for causing the classification switch to perform trial power transmission for a predetermined time,
When the ground fault accident detection element detects a ground fault while the trial transmission of the segment switch by the trial power transmission control unit, a lock unit is added to lock the division switch so as not to be closed. A distribution line protection device characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7705592U JPH0644343U (en) | 1992-11-09 | 1992-11-09 | Distribution line protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7705592U JPH0644343U (en) | 1992-11-09 | 1992-11-09 | Distribution line protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0644343U true JPH0644343U (en) | 1994-06-10 |
Family
ID=13623107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7705592U Pending JPH0644343U (en) | 1992-11-09 | 1992-11-09 | Distribution line protection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0644343U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009089482A (en) * | 2007-09-28 | 2009-04-23 | Denso Corp | Stator core of rotating electric machine and its manufacturing method |
-
1992
- 1992-11-09 JP JP7705592U patent/JPH0644343U/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009089482A (en) * | 2007-09-28 | 2009-04-23 | Denso Corp | Stator core of rotating electric machine and its manufacturing method |
| JP4518126B2 (en) * | 2007-09-28 | 2010-08-04 | 株式会社デンソー | Stator core of rotating electrical machine and method for manufacturing the same |
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