JP2020148737A - Earth leakage monitoring device - Google Patents

Earth leakage monitoring device Download PDF

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JP2020148737A
JP2020148737A JP2019048911A JP2019048911A JP2020148737A JP 2020148737 A JP2020148737 A JP 2020148737A JP 2019048911 A JP2019048911 A JP 2019048911A JP 2019048911 A JP2019048911 A JP 2019048911A JP 2020148737 A JP2020148737 A JP 2020148737A
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earth leakage
output
leakage
display
leakage monitoring
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晃司 横田
Koji Yokota
晃司 横田
智浩 山田
Tomohiro Yamada
智浩 山田
晋一朗 後藤
Shinichiro Goto
晋一朗 後藤
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Omron Corp
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Omron Corp
Omron Tateisi Electronics Co
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Priority to JP2019048911A priority Critical patent/JP2020148737A/en
Priority to PCT/JP2020/002571 priority patent/WO2020189013A1/en
Publication of JP2020148737A publication Critical patent/JP2020148737A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/145—Indicating the presence of current or voltage
    • G01R19/15—Indicating the presence of current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

To aim at gaining both of a planned maintenance activity when earth leakage is increasing gradually and prompt recovery when abrupt earth leakage occurs without using an ELCB for each individual apparatus.SOLUTION: An earth leakage monitoring unit 20 includes: detection parts (205, 206, 207, 208) of a leakage current output from a zero-phase current transformer 13; a processing part 209 for calculating an instantaneous value of a leakage current at a period equivalent to or more than operation of an earth leakage circuit breaker 11 on the basis of output of the detection parts and performs abnormality determination when the instantaneous value exceeds a threshold; a display part 203 for displaying the instantaneous value and a result of abnormality determination on the basis of output of the processing part 209; and a power supply circuit 204 capable of supplying an output voltage during a predetermined period even if an input voltage is lost. The display part 203 maintains display even after supply of the output voltage by the power supply circuit 204 is stopped.SELECTED DRAWING: Figure 2

Description

この発明は、漏電監視装置に関する。 The present invention relates to an earth leakage monitoring device.

製造業などでは、突発的な電断により装置等が停止すると大きな機会損失を招くことから、ELCB（漏電遮断器）で電源ラインを開放して電源供給を遮断する前に、漏電の増加傾向を捉えて計画的な保全を行うことが求められる。また、電断してしまった場合には、早急に復旧させて機会損失を最小化するため早急な普及が求められる。 In the manufacturing industry, if the equipment is stopped due to a sudden power failure, a large opportunity loss will occur. Therefore, before opening the power line with an ELCB (earth leakage breaker) to cut off the power supply, the tendency for leakage to increase It is required to grasp and carry out systematic maintenance. In addition, if the power is cut off, it is required to spread immediately in order to restore it immediately and minimize the opportunity loss.

そこで、例えば、特許文献１では、漏洩電流の増加傾向を監視・記録することで、これを実現しようとしている。特許文献１では、回路毎に漏洩電流を計測することで、個所の特定も可能となる。 Therefore, for example, Patent Document 1 attempts to realize this by monitoring and recording the increasing tendency of the leakage current. In Patent Document 1, it is possible to identify a location by measuring the leakage current for each circuit.

特開平１１−１３３０９４号公報Japanese Unexamined Patent Publication No. 11-13304

しかしながら、特許文献１の方法は、絶縁劣化が徐々に進行し、それに伴って漏洩電流が徐々に増加する場合にのみ有効である。 However, the method of Patent Document 1 is effective only when the insulation deterioration gradually progresses and the leakage current gradually increases accordingly.

漏電は、装置等の機械的なダメージや被水などで突発的に発生することもあり、漏電電流の瞬時値が閾値を超えている場合には、ELCBが動作して、０．１秒以内に電源供給が遮断される。電源供給の遮断後は、漏洩電流が無くなるため、ELCBの動作速度以上の速度で警報表示をする必要がある。さらに、電源供給の遮断後は、漏電監視装置自身の電源も消失するため、警報表示を電源なしの状態で維持していなければ、漏電の発生個所の特定はできない。 Leakage may occur suddenly due to mechanical damage to the equipment or water damage, and if the instantaneous value of the leakage current exceeds the threshold value, ELCB operates within 0.1 seconds. The power supply is cut off. After the power supply is cut off, the leakage current disappears, so it is necessary to display an alarm at a speed higher than the operating speed of the ELCB. Further, since the power supply of the leakage monitoring device itself is lost after the power supply is cut off, the location where the leakage occurs cannot be identified unless the alarm display is maintained without the power supply.

従って、徐々に漏電が増加している場合の計画的な保全活動（予防保全）と、突発的な漏電発生時の早期復旧（事後保全の効率化）を両立しようとする場合、特許文献１のような従来技術の漏電監視装置の導入に加えて、MCCB（配線用遮断器）をELCBに交換することが必要になり、設置工事を含めて多額のコストと手間が必要になる。 Therefore, when trying to achieve both planned maintenance activities (preventive maintenance) when an electric leakage is gradually increasing and early recovery (improvement of post-maintenance efficiency) in the event of a sudden electric leakage, Patent Document 1 In addition to the introduction of such a conventional earth leakage monitoring device, it is necessary to replace the MCCB (molded case circuit breaker) with an ELCB, which requires a large amount of cost and labor including installation work.

本発明は、上記課題を解決するためになされたものであって、個別の機器ごとにELCBを用いることなく、徐々に漏電が増加している場合の計画的な保全活動と、突発的な漏電発生時の早期復旧とを両立することが可能な漏電監視装置を提供することを目的とする。 The present invention has been made to solve the above problems, and is a systematic maintenance activity when the leakage is gradually increasing without using ELCB for each individual device, and a sudden leakage. It is an object of the present invention to provide an earth leakage monitoring device capable of achieving both early recovery in the event of an occurrence.

本発明における漏電監視装置の一態様は、
零相変流器から出力される漏洩電流の検出部と、
前記検出部の出力に基づき、漏電遮断器の動作と同等以上の周期で漏洩電流の瞬時値を算出し、前記瞬時値が閾値超えた場合に異常判定を行う処理部と、
前記処理部の出力に基づき、前記瞬時値および前記異常判定の結果を表示する表示部と、
入力電圧が消失しても所定期間において出力電圧の供給が可能な電源回路と、を備え、
前記表示部は、前記電源回路による前記出力電圧の供給が停止した後においても表示を維持する。 One aspect of the earth leakage monitoring device in the present invention is
The leakage current detector output from the zero-phase current transformer and
Based on the output of the detection unit, a processing unit that calculates the instantaneous value of the leakage current at a cycle equal to or longer than the operation of the earth leakage breaker and determines an abnormality when the instantaneous value exceeds the threshold value.
A display unit that displays the instantaneous value and the result of the abnormality determination based on the output of the processing unit.
It is equipped with a power supply circuit that can supply the output voltage for a predetermined period even if the input voltage disappears.
The display unit maintains the display even after the supply of the output voltage by the power supply circuit is stopped.

本発明によれば、個別の機器ごとにELCBを用いることなく、徐々に漏電が増加している場合の計画的な保全活動と、突発的な漏電発生時の早期復旧とを両立することが可能な漏電監視装置を提供することができる。 According to the present invention, it is possible to achieve both planned maintenance activities when an electric leakage is gradually increasing and early recovery in the event of a sudden electric leakage without using ELCB for each individual device. An earth leakage monitoring device can be provided.

本発明に係る一実施形態の漏電監視システムの概略構成を示す図である。It is a figure which shows the schematic structure of the earth leakage monitoring system of one Embodiment which concerns on this invention. 漏電監視ユニットのハードウェア構成を示すブロック図である。It is a block diagram which shows the hardware configuration of the earth leakage monitoring unit. 検出部の一例を示す回路図である。It is a circuit diagram which shows an example of a detection part. 漏電監視ユニットの動作のタイミングチャートである。It is a timing chart of the operation of the earth leakage monitoring unit. （Ａ）は、漏洩電流が閾値以下の場合の表示部の表示例であり、図５（Ｂ）は、漏洩電流が閾値を超えた場合の表示部の表示例である。(A) is a display example of the display unit when the leakage current is equal to or less than the threshold value, and FIG. 5 (B) is a display example of the display unit when the leakage current exceeds the threshold value.

以下、この発明の一実施形態について図面を参照しながら詳細に説明する。図１は、本実施形態に係る漏電監視システム１００の概略構成を示す図である。図１に示すように、漏電監視システム１００は、分電盤１０と、分電盤１０内に設けられた零相変流器１３と、漏電監視ユニット２０と、漏電監視ユニット２０に接続された上位システム４０とを備えている。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of an earth leakage monitoring system 100 according to the present embodiment. As shown in FIG. 1, the earth leakage monitoring system 100 is connected to the distribution board 10, the zero-phase current transformer 13 provided in the distribution board 10, the earth leakage monitoring unit 20, and the earth leakage monitoring unit 20. It is equipped with a host system 40.

分電盤１０は、配電盤等の電源３０に接続されており、漏電遮断器１１と、配線用遮断器１２とを備えている。漏電遮断器１１は、分電盤１０の主開閉器として取り付けられており、漏電電流の増加により、電源３０から分電盤１０への電源ラインを開放して、電源供給を遮断するように構成される。また、配線用遮断器１２は、負荷に異常な過電流が流れたときに電路を開放し、負荷への電源供給を遮断することにより負荷回路や電線を損傷から保護する。 The distribution board 10 is connected to a power source 30 such as a distribution board, and includes an earth leakage breaker 11 and a wiring breaker 12. The earth leakage breaker 11 is attached as a main switch of the distribution board 10, and is configured to open the power line from the power source 30 to the distribution board 10 to cut off the power supply due to an increase in the earth leakage current. Will be done. Further, the wiring breaker 12 protects the load circuit and the electric wire from damage by opening the electric circuit when an abnormal overcurrent flows through the load and cutting off the power supply to the load.

零相変流器１３は、各負荷の漏電電流を検出する。また、零相変流器１３の出力は、漏電監視ユニット２０において、漏洩電流の検出のために用いられる。零相変流器１３は、分割型を使用することで、設置の際に工事の手間を減らすことができる。 The zero-phase current transformer 13 detects the leakage current of each load. Further, the output of the zero-phase current transformer 13 is used in the leakage monitoring unit 20 for detecting the leakage current. By using the split type of the zero-phase current transformer 13, it is possible to reduce the labor of construction at the time of installation.

漏電監視ユニット２０は、各負荷の漏電電流の記録と、漏電電流の瞬時値が閾値超えた場合に異常判定を行う機能を有する。漏電監視ユニット２０は、表示部２０３を備えており、漏電電流の瞬時値と、異常判定の結果を表示する。漏電監視ユニット２０の詳細については後述する。 The leakage monitoring unit 20 has a function of recording the leakage current of each load and performing an abnormality determination when the instantaneous value of the leakage current exceeds the threshold value. The leakage monitoring unit 20 includes a display unit 203, and displays an instantaneous value of the leakage current and the result of abnormality determination. Details of the earth leakage monitoring unit 20 will be described later.

上位システム４０は、漏電監視ユニット２０と接続されており、漏電監視ユニット２０に対して、異常判定のための閾値の出力と、漏電監視ユニット２０により検出される漏電電流の瞬時値と、異常判定の結果とを入力して、記録をとることができる。 The host system 40 is connected to the leakage monitoring unit 20, and for the leakage monitoring unit 20, the output of the threshold value for determining an abnormality, the instantaneous value of the leakage current detected by the leakage monitoring unit 20, and the abnormality determination You can enter the result of and record it.

図２は、漏電監視ユニット２０のハードウェア構成を示すブロック図である。図２に示すように、漏電監視ユニット２０は、押しボタンスイッチ２０１と、記憶部２０２と、表示部２０３と、電源回路２０４と、反限時出力回路２０５と、全波整流回路２０６と、増幅回路２０７と、レベル切替回路２０８とを備えている。また、漏電監視ユニット２０は、処理部２０９と、通信回路２１０と、出力回路２１１とを備えている。 FIG. 2 is a block diagram showing a hardware configuration of the earth leakage monitoring unit 20. As shown in FIG. 2, the earth leakage monitoring unit 20 includes a push button switch 201, a storage unit 202, a display unit 203, a power supply circuit 204, a counter-time output circuit 205, a full-wave rectifier circuit 206, and an amplifier circuit. It includes a 207 and a level switching circuit 208. Further, the earth leakage monitoring unit 20 includes a processing unit 209, a communication circuit 210, and an output circuit 211.

押しボタンスイッチ２０１は、表示部２０３における表示モード等の設定用のインターフェースである。記憶部２０２は、漏洩電流の異常判定を行うための閾値を記憶する。閾値は、上位システム４０から出力される。表示部２０３は、漏洩電流の瞬時値および異常判定の結果を表示する。表示部２０３の詳細については後述する。 The push button switch 201 is an interface for setting the display mode and the like on the display unit 203. The storage unit 202 stores a threshold value for determining an abnormality of the leakage current. The threshold value is output from the host system 40. The display unit 203 displays the instantaneous value of the leakage current and the result of the abnormality determination. The details of the display unit 203 will be described later.

電源回路２０４は、漏電遮断器１１を介して電源ラインに接続されており、ＡＣ／ＤＣ変換で漏電監視ユニット２０の電源を生成する。また、電源回路２０４は、電源ラインからの入力電圧が消失しても、コンデンサの機能により、所定期間、例えば数百ｍｓの期間において漏電監視ユニット２０に対して出力電圧の供給が可能となっている。 The power supply circuit 204 is connected to the power supply line via the earth leakage breaker 11, and generates a power source for the earth leakage monitoring unit 20 by AC / DC conversion. Further, even if the input voltage from the power supply line disappears, the power supply circuit 204 can supply the output voltage to the leakage monitoring unit 20 for a predetermined period, for example, a period of several hundred ms by the function of the capacitor. There is.

反限時出力回路２０５と、全波整流回路２０６と、増幅回路２０７と、レベル切替回路２０８とは、漏電監視ユニット２０における検出部として機能し、零相変流器１３から出力にされる漏洩電流を検出する。図３は、反限時出力回路２０５と、全波整流回路２０６と、増幅回路２０７と、レベル切替回路２０８の一例を示す回路図である。 The reverse time limit output circuit 205, the full-wave rectifier circuit 206, the amplifier circuit 207, and the level switching circuit 208 function as a detector in the earth leakage monitoring unit 20, and the leakage current output from the zero-phase current transformer 13. Is detected. FIG. 3 is a circuit diagram showing an example of the reverse time limit output circuit 205, the full-wave rectifier circuit 206, the amplifier circuit 207, and the level switching circuit 208.

図３に示すように、反限時出力回路２０５は、抵抗Ｒ７とコンデンサＣ１とから構成され、大きな漏洩電流が流れた際に、反限時動作特性により、処理部２０９における異常判定に必要な時間を確保する。全波整流回路２０６は、抵抗Ｒ１〜Ｒ５、ダイオードＤ１、およびオペアンプＵ１，Ｕ２から構成され、増幅回路２０７によって増幅された零相変流器１３の出力の全波整流を行う。増幅回路２０７は、抵抗Ｒ６，Ｒ９とオペアンプＵ３とから構成され、零相変流器１３の出力を増幅する。レベル切替回路２０８は、アナログスイッチＩＣと抵抗Ｒ８，Ｒ１０，Ｒ１１，Ｒ１２とから構成され、漏電遮断器１１の動作閾値の設定によって増幅度を切り替え可能に構成されている。 As shown in FIG. 3, the counter-time output circuit 205 is composed of a resistor R7 and a capacitor C1, and when a large leakage current flows, the time required for abnormality determination in the processing unit 209 is determined by the counter-time operation characteristics. Secure. The full-wave rectifier circuit 206 is composed of resistors R1 to R5, diodes D1, and operational amplifiers U1 and U2, and performs full-wave rectification of the output of the zero-phase current transformer 13 amplified by the amplifier circuit 207. The amplifier circuit 207 is composed of resistors R6 and R9 and an operational amplifier U3, and amplifies the output of the zero-phase current transformer 13. The level switching circuit 208 is composed of an analog switch IC and resistors R8, R10, R11, and R12, and is configured so that the amplification degree can be switched by setting the operation threshold value of the earth leakage breaker 11.

処理部２０９は、ＣＰＵ等から構成され、検出部としてのレベル切替回路２０８、増幅回路２０７、全波整流回路２０６、および反限時出力回路２０５の出力に基づき、漏電遮断器１１の動作と同等以上の周期で漏洩電流の瞬時値を算出する。また、処理部２０９は、漏洩電流の瞬時値が閾値を超えた場合に異常判定を行う。 The processing unit 209 is composed of a CPU and the like, and is equal to or higher than the operation of the earth leakage breaker 11 based on the outputs of the level switching circuit 208, the amplification circuit 207, the full-wave rectifier circuit 206, and the counter-time output circuit 205 as detection units. The instantaneous value of the leakage current is calculated in the cycle of. Further, the processing unit 209 makes an abnormality determination when the instantaneous value of the leakage current exceeds the threshold value.

通信回路２１０は、記憶部２０２に記憶されたデータや漏洩電流の瞬時値を、上位システム４０から要望された任意のタイミングもしくは周期的に伝達する。また、異常判定の閾値を上位システム４０から受けとり、記憶部２０２へ伝達する。 The communication circuit 210 transmits the data stored in the storage unit 202 and the instantaneous value of the leakage current at an arbitrary timing or periodically requested by the host system 40. Further, the threshold value for determining the abnormality is received from the upper system 40 and transmitted to the storage unit 202.

出力回路２１１は、異常判定の結果を出力する。出力回路２１１により、上位システム４０および表示部２０３以外の機器において、異常判定の結果を利用することができる。 The output circuit 211 outputs the result of the abnormality determination. The output circuit 211 makes it possible to use the result of abnormality determination in devices other than the host system 40 and the display unit 203.

図４に、漏電監視ユニット２０の動作のタイミングチャートを示す。図４に示すように、負荷の漏洩電流が判定閾値を超えると、漏洩遮断器１１は、電源ラインを開放し、漏電監視ユニット２０に対する電源供給を遮断する。しかし、電源供給の遮断後においても、電源回路２０４の機能により、例えば数百ｍｓ程度は漏電監視ユニット２０の内部電源は動作可能に維持される。処理部２０９は、この間に、異常判定を行い、表示部２０３への警報表示出力と、上位システム４０に対する警報出力を行う。本実施形態においては、表示部２０３は、例えば、電子ペーパーから構成されており、電源回路２０４による出力電圧の供給が停止した後においても表示が維持される。したがって、直ちに漏電の復旧作業が可能になっている。そして、処理部２０９は、漏電箇所の復旧作業後において、漏電電流が閾値以下ならば、警報表示もオフする。 FIG. 4 shows a timing chart of the operation of the earth leakage monitoring unit 20. As shown in FIG. 4, when the leakage current of the load exceeds the determination threshold value, the earth leakage breaker 11 opens the power supply line and cuts off the power supply to the leakage monitoring unit 20. However, even after the power supply is cut off, the internal power supply of the leakage monitoring unit 20 is maintained to be operable for about several hundred ms, for example, by the function of the power supply circuit 204. During this period, the processing unit 209 performs an abnormality determination, outputs an alarm display to the display unit 203, and outputs an alarm to the host system 40. In the present embodiment, the display unit 203 is composed of, for example, electronic paper, and the display is maintained even after the supply of the output voltage by the power supply circuit 204 is stopped. Therefore, it is possible to immediately recover the leakage. Then, the processing unit 209 also turns off the alarm display if the leakage current is equal to or less than the threshold value after the restoration work of the leakage portion.

図５（Ａ），（Ｂ）に、表示部２０３における表示例を示す。図５（Ａ）は、漏洩電流が閾値以下の場合の表示例であり、図５（Ｂ）は、漏洩電流が閾値を超えた場合の表示例示す。 5 (A) and 5 (B) show a display example in the display unit 203. FIG. 5A shows a display example when the leakage current is below the threshold value, and FIG. 5B shows a display example when the leakage current exceeds the threshold value.

図５（Ａ），（Ｂ）に示すように、第１表示部２０３ａは、漏洩電流値がどの回路のものであるかを表示する。回路の選択は、ユーザが任意に切り替え可能である。あるいは、回路の表示を、数秒後ごとに自動で切り替えるようにしてもよい。 As shown in FIGS. 5A and 5B, the first display unit 203a displays which circuit the leakage current value belongs to. The selection of the circuit can be arbitrarily switched by the user. Alternatively, the circuit display may be automatically switched every few seconds.

第２表示部２０３ｂは、回路の漏洩電流値を数値で表示する。また、第３表示部２０３ｃは、漏電監視ユニット２０のハードウェアの異常など、エラーメッセージ等を表示する。 The second display unit 203b numerically displays the leakage current value of the circuit. Further, the third display unit 203c displays an error message or the like such as an abnormality in the hardware of the earth leakage monitoring unit 20.

図５（Ａ）に示すように、表示部２０３は、以上のような第１表示部２０３ａ、第２表示部２０３ｂ、および第３表示部２０３ｃを備えているので、ユーザは、漏洩電流が閾値以下の場合に、各回路の漏洩電流値を確認することができる。 As shown in FIG. 5A, since the display unit 203 includes the first display unit 203a, the second display unit 203b, and the third display unit 203c as described above, the user can use the leakage current as a threshold value. In the following cases, the leakage current value of each circuit can be confirmed.

また、表示部２０３は、図５（Ｂ）に示すように、第４表示部２０３ｄを備えている。第４表示部２０３ｄには、閾値を超える漏電電流が流れた際に、例えば、“OVER”という警報表示を行う。また、閾値を超える漏電電流が流れた際には、第１表示部２０３ａには、閾値を超える漏電電流が流れた回路を自動で表示する。また、第２表示部２０３ｂには、閾値を超える漏電電流値を数値で表示する。 Further, as shown in FIG. 5B, the display unit 203 includes a fourth display unit 203d. When a leakage current exceeding the threshold value flows through the fourth display unit 203d, for example, an alarm display of "OVER" is displayed. Further, when a leakage current exceeding the threshold value flows, the circuit in which the leakage current exceeding the threshold value flows is automatically displayed on the first display unit 203a. Further, the second display unit 203b displays the leakage current value exceeding the threshold value numerically.

本実施形態の表示部２０３は、例えば、電子ペーパーで構成されており、漏電監視ユニット２０への電源供給が遮断された後においても、警報表示、漏電電流が流れた回路の表示、および漏電電流値の表示を継続することができる。 The display unit 203 of the present embodiment is composed of, for example, electronic paper, and even after the power supply to the leakage monitoring unit 20 is cut off, an alarm display, a display of a circuit through which a leakage current has flowed, and a leakage current The display of the value can be continued.

漏電遮断器１１が動作した場合、復帰させるには、ユーザがその現場へ必ず出向かなければならない。しかし、本実施形態によれば、分電盤１０内に取り付けられた漏電監視ユニット２０の警報表示をユーザが確認することができ、漏電が発生した回路を瞬時に判断できるため、その回路のみ配線用遮断器１２で切り離すことにより、その他の回路を早急に復旧させることができる。 When the earth leakage breaker 11 operates, the user must go to the site in order to restore it. However, according to the present embodiment, the user can confirm the alarm display of the leakage monitoring unit 20 installed in the distribution board 10, and the circuit in which the leakage has occurred can be instantly determined. Therefore, only that circuit is wired. By disconnecting with the circuit breaker 12, other circuits can be restored immediately.

また、本実施形態によれば、処理部２０９は、漏電遮断器１１の動作と同等以上の周期で漏洩電流の瞬時値を算出し、漏電遮断器１１以上の速度で漏洩電流を検出できる。したがって、漏洩電流が予め設定された閾値を超えた場合、瞬時に漏電監視ユニット２０自身が警報表示を行うことができる。 Further, according to the present embodiment, the processing unit 209 can calculate the instantaneous value of the leakage current at a cycle equal to or longer than the operation of the earth leakage breaker 11 and detect the leakage current at a speed equal to or higher than that of the earth leakage breaker 11. Therefore, when the leakage current exceeds a preset threshold value, the leakage monitoring unit 20 itself can instantly display an alarm.

さらに、本実施形態によれば、記憶部２０２および上位システム４０を備えており、漏洩電流の記録をとることが可能なので、漏洩電流の増加傾向を把握して計画的な保全活動を行うことができる。 Further, according to the present embodiment, since the storage unit 202 and the host system 40 are provided and it is possible to record the leakage current, it is possible to grasp the increasing tendency of the leakage current and perform planned maintenance activities. it can.

以上のように、本実施形態によれば、配線用遮断器１２を全て漏電遮断器に交換することなく、予防保全と事後保全の両立を、容易に低コストで実現することができる。 As described above, according to the present embodiment, both preventive maintenance and post-maintenance can be easily realized at low cost without replacing all the wiring breakers 12 with earth leakage breakers.

（変形例）
以上の実施形態は例示であり、この発明の範囲から離れることなく様々な変形が可能である。 (Modification example)
The above embodiment is an example, and various modifications can be made without departing from the scope of the present invention.

上述した実施形態では、表示部２０３の例として、電子ペーパーを用いた態様について説明した。しかしながら、本発明はこのような態様に限定される訳ではなく、例えば、表示部２０３として、電断後も異常表示を継続できる磁気反転表示器を用いてもよい。 In the above-described embodiment, an embodiment using electronic paper has been described as an example of the display unit 203. However, the present invention is not limited to such an aspect, and for example, a magnetic reversal display capable of continuing an abnormal display even after a power failure may be used as the display unit 203.

本明細書では、本発明の実施形態に係る漏電監視装置について説明したが、本発明は、これに限定されるものではなく、本発明の要旨を逸脱しない範囲で、種々の変更が可能である。 Although the leakage monitoring device according to the embodiment of the present invention has been described in the present specification, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. ..

１０ 分電盤
１１ 漏電遮断器
１２ 配線用遮断器
１３ 零相変流器
２０ 漏電監視ユニット
４０ 上位システム
２０２ 記憶部
２０３ 表示部
２０４ 電源回路
２０５ 反限時出力回路
２０６ 全波整流回路
２０７ 増幅回路
２０８ レベル切替回路
２０９ 処理部
２１０ 通信回路
２１１ 出力回路 10 Distribution board 11 Earth leakage breaker 12 Residual circuit breaker 13 Zero phase current transformer 20 Earth leakage monitoring unit 40 Upper system 202 Storage unit 203 Display unit 204 Power supply circuit 205 Counter-time output circuit 206 Full-wave rectifier circuit 207 Amplification circuit 208 level Switching circuit 209 Processing unit 210 Communication circuit 211 Output circuit

Claims (5)

零相変流器から出力される漏洩電流の検出部と、
前記検出部の出力に基づき、漏電遮断器の動作と同等以上の周期で漏洩電流の瞬時値を算出し、前記瞬時値が閾値を超えた場合に異常判定を行う処理部と、
前記処理部の出力に基づき、前記瞬時値および前記異常判定の結果を表示する表示部と、
入力電圧が消失しても所定期間において出力電圧の供給が可能な電源回路と、を備え、
前記表示部は、前記電源回路による前記出力電圧の供給が停止した後においても表示を維持する、
ことを特徴とする漏電監視装置。 The leakage current detector output from the zero-phase current transformer and
Based on the output of the detection unit, a processing unit that calculates the instantaneous value of the leakage current at a cycle equal to or longer than the operation of the earth leakage breaker and determines an abnormality when the instantaneous value exceeds the threshold value.
A display unit that displays the instantaneous value and the result of the abnormality determination based on the output of the processing unit.
It is equipped with a power supply circuit that can supply the output voltage for a predetermined period even if the input voltage disappears.
The display unit maintains the display even after the supply of the output voltage by the power supply circuit is stopped.
An earth leakage monitoring device characterized by this. 前記表示部は、電子ペーパーである、
ことを特徴とする請求項１に記載の漏電監視装置。 The display unit is an electronic paper.
The earth leakage monitoring device according to claim 1. 前記表示部は、磁気反転表示器である、
ことを特徴とする請求項１に記載の漏電監視装置。 The display unit is a magnetic reversal display.
The earth leakage monitoring device according to claim 1. 前記漏洩電流の異常判定を行うための閾値を記憶する記憶部を備える、
ことを特徴とする請求項１ないし請求項３のいずれか１項に記載の漏電監視装置。 A storage unit for storing a threshold value for determining an abnormality of the leakage current is provided.
The leakage monitoring device according to any one of claims 1 to 3, wherein the leakage monitoring device is characterized. 上位システムと通信可能な通信部を備え、
前記記憶部は、前記通信部を介して前記上位システムから受け取った前記閾値を記憶する、
ことを特徴とする請求項４に記載の漏電監視装置。 Equipped with a communication unit that can communicate with the host system
The storage unit stores the threshold value received from the higher-level system via the communication unit.
The earth leakage monitoring device according to claim 4.
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