JP2009198282A - Leakage current measurement apparatus - Google Patents

Leakage current measurement apparatus Download PDF

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JP2009198282A
JP2009198282A JP2008039587A JP2008039587A JP2009198282A JP 2009198282 A JP2009198282 A JP 2009198282A JP 2008039587 A JP2008039587 A JP 2008039587A JP 2008039587 A JP2008039587 A JP 2008039587A JP 2009198282 A JP2009198282 A JP 2009198282A
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leakage current
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line
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JP5101334B2 (en
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Sadataka Miyajima
貞敬 宮島
Hirotaka Kenmochi
浩崇 釼持
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Hioki EE Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To determine the quality of an insulating state of a to-be-measured electric line even if a voltage is not measured at the to-be-measured electric line. <P>SOLUTION: A leakage current measurement apparatus comprises: a current detecting section 2 provided with a current sensor 2a clamped to the electric lines 11, 12, and detecting a leakage current Io flowing in the electric lines 11, 12; a voltage detecting section 3 for detecting an AC voltage V1 at the electric lines 11, 12; and a processing section 4 for calculating an effective leakage current Ior based on the AC voltage V1 detected by the voltage detecting section 3 and the leakage current Io detected by the current detecting section 2. When the AC voltage V1 is less than a reference voltage Vr, the processing section 4 causes a display section 6 to display the leakage current Io detected by the current detecting section 2 without calculating the effective leakage current Ior. When the AC voltage V1 is the reference voltage Vr or more, the processing section 4 calculates the effective leakage current Ior, and causes the display section 6 to display the effective leakage current Ior along with the leakage current Io. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、測定対象電線路に流れる漏れ電流を測定する漏れ電流測定装置に関するものである。   The present invention relates to a leakage current measuring apparatus that measures a leakage current flowing in a measurement target electric line.

この種の漏れ電流測定装置として、下記の特許文献１に開示された漏れ電流測定装置（漏洩電流測定装置）が知られている。この漏れ電流測定装置は、被測定電線路（測定対象電線路。以下、単に「電線路」ともいう）または接地線に流れる漏れ電流を検出するカレントトランスセンサ（電流センサ）と、電流電圧変換回路と、電圧増幅回路と、電線路の電圧線の回路電圧を分圧すると共に増幅する電圧分圧増幅回路と、電圧増幅回路の出力と電圧分圧増幅回路の出力とを掛け合わせる乗算回路と、ローパスフィルタと、このローパスフィルタの出力信号である漏れ電流信号（有効漏れ電流信号）を表示する漏れ電流表示回路と、この漏れ電流信号が規定値を超えるか規定値以下であるかを判定する漏れ電流比較判定回路と、この漏れ電流比較判定回路の判定結果を表示する判定結果表示回路と、カレントトランスセンサの接続状態の正逆を判定する極性判定回路とを有している。   As this type of leakage current measuring apparatus, a leakage current measuring apparatus (leakage current measuring apparatus) disclosed in Patent Document 1 below is known. This leakage current measuring apparatus includes a current transformer sensor (current sensor) that detects a leakage current flowing through a measured electrical line (measurement electrical line; hereinafter simply referred to as “electrical line”) or a ground line, and a current-voltage conversion circuit. A voltage amplifying circuit, a voltage dividing amplifying circuit that divides and amplifies the circuit voltage of the voltage line of the electric line, a multiplication circuit that multiplies the output of the voltage amplifying circuit and the output of the voltage dividing amplifying circuit, and a low-pass A leakage current display circuit that displays a filter, a leakage current signal (effective leakage current signal) that is an output signal of the low-pass filter, and a leakage current that determines whether the leakage current signal exceeds a specified value or less than a specified value A comparison determination circuit, a determination result display circuit for displaying a determination result of the leakage current comparison determination circuit, and a polarity determination circuit for determining whether the connection state of the current transformer sensor is normal or reverse It has.

この漏れ電流測定装置では、漏れ電流測定装置の電圧成分入力端子を電線路に接続し、かつカレントトランスセンサを電線路にクランプすることで、有効漏れ電流の値を表示回路に表示する。したがって、この漏れ電流測定装置によれば、表示された有効漏れ電流の値に基づいて、電線路を備えた電気機器類の絶縁状態の良否を判別することが可能となっている。
特開２００２−１３１３６２号公報（第１，４頁、第１図） In this leakage current measuring apparatus, the value of the effective leakage current is displayed on the display circuit by connecting the voltage component input terminal of the leakage current measuring apparatus to the electric line and clamping the current transformer sensor to the electric line. Therefore, according to this leakage current measuring apparatus, it is possible to determine the quality of the insulation state of the electrical equipment provided with the electric lines based on the displayed value of the effective leakage current.
Japanese Patent Laid-Open No. 2002-131362 (pages 1, 4 and 1)

ところが、上記の漏れ電流測定装置には、以下の問題点が存在している。すなわち、この漏れ電流測定装置では、カレントトランスセンサの電線路への装着と併せて電圧分圧増幅回路の電線路への接続も常に行う必要があり、この電圧分圧増幅回路の電線路への接続を行わない場合には、有効漏れ電流を算出できないことから有効漏れ電流の表示回路への表示がされない状態、すなわち表示回路に何も表示されない状態となる。このため、この漏れ電流測定装置には、電圧分圧増幅回路の電線路への接続を行わない場合（つまり、電線路の電圧を測定できない場合）、電線路についての漏れ電流の検査を全く実施できないという問題点が存在している。   However, the above leakage current measuring apparatus has the following problems. That is, in this leakage current measuring apparatus, it is necessary to always connect the voltage dividing amplifier circuit to the electric wire along with the mounting of the current transformer sensor to the electric wire. When the connection is not performed, the effective leakage current cannot be calculated, so that the effective leakage current is not displayed on the display circuit, that is, the display circuit is not displayed. For this reason, in this leakage current measuring device, when the voltage divider circuit is not connected to the electric line (that is, when the voltage of the electric line cannot be measured), the leakage current is completely inspected for the electric line. There is a problem that it cannot be done.

ところで、電線路についての絶縁点検の管理基準（電気設備技術基準の解釈 第１４条）によれば、漏れ電流（有効漏れ電流と無効漏れ電流の合成電流）の測定値が所定の基準値（例えば、１ｍＡ）以下であれば、有効漏れ電流を測定することなく、管理基準を満すことになる。本願発明者は、この点に着目することで、電圧検出用コードの電線路への接続の如何（つまり、電線路についての電圧の測定の有無）に拘わらず電線路についての絶縁点検を実施可能な漏れ電流測定装置を実現できるのではと考えた。   By the way, according to the management standard of insulation inspection for electric lines (interpretation of electrical equipment technical standards Article 14), the measured value of leakage current (the combined current of effective leakage current and reactive leakage current) is a predetermined reference value (for example, 1 mA) or less, the management standard is satisfied without measuring the effective leakage current. By paying attention to this point, the inventor of the present application can carry out an insulation inspection on the electric wire regardless of whether the voltage detection cord is connected to the electric wire (that is, whether or not the voltage is measured on the electric wire). I thought that it would be possible to realize a simple leakage current measuring device.

本発明は、上記の課題を解決すべくなされたものであり、測定対象電線路の電圧測定を実施しないときにおいても測定対象電線路についての絶縁状態の良否を判別し得る漏れ電流測定装置を提供することを主目的とする。   The present invention has been made to solve the above-described problem, and provides a leakage current measuring device that can determine the quality of the insulation state of a measurement target electrical line even when voltage measurement of the measurement target electrical line is not performed. The main purpose is to do.

上記目的を達成すべく請求項１記載の漏れ電流測定装置は、一対の測定対象電線路にクランプされて当該測定対象電線路に流れる漏れ電流を検出する電流センサを備えた電流検出部と、前記一対の測定対象電線路についての線路間電圧を検出する電圧検出部と、前記電圧検出部によって検出された前記線路間電圧、および前記電流検出部で検出された前記漏れ電流に基づいて有効漏れ電流を算出可能な処理部とを備え、前記処理部は、前記電圧検出部によって検出された前記線路間電圧が予め規定された基準電圧未満のときには、前記有効漏れ電流を算出することなく、前記電流検出部で検出された前記漏れ電流を表示部に表示させ、当該線路間電圧が当該基準電圧以上のときには、前記有効漏れ電流を算出して前記漏れ電流と共に前記表示部に表示させる。   In order to achieve the above object, the leakage current measuring apparatus according to claim 1 is provided with a current detection unit including a current sensor that is clamped by a pair of measurement target electric lines and detects a leakage current flowing through the measurement target electric lines, An effective leakage current based on a voltage detection unit that detects a line-to-line voltage for a pair of measurement target wires, the line-to-line voltage detected by the voltage detection unit, and the leakage current detected by the current detection unit The processing unit is capable of calculating the current leakage without calculating the effective leakage current when the line voltage detected by the voltage detection unit is less than a predetermined reference voltage. The leakage current detected by the detection unit is displayed on the display unit. When the line voltage is equal to or higher than the reference voltage, the effective leakage current is calculated and displayed together with the leakage current. To be displayed on.

また、請求項２記載の漏れ電流測定装置は、請求項１記載の漏れ電流測定装置において、前記処理部は、前記線路間電圧が前記基準電圧未満のときには、当該線路間電圧が検出されていない旨を前記表示部に表示させる。   Moreover, the leakage current measuring apparatus according to claim 2 is the leakage current measuring apparatus according to claim 1, wherein when the line-to-line voltage is less than the reference voltage, the line-to-line voltage is not detected. The effect is displayed on the display unit.

また、請求項３記載の漏れ電流測定装置は、請求項１または２記載の漏れ電流測定装置において、前記処理部は、前記線路間電圧が前記基準電圧以上のときには、当該線路間電圧を前記表示部に表示させる。   The leakage current measuring apparatus according to claim 3 is the leakage current measuring apparatus according to claim 1 or 2, wherein the processing unit displays the line voltage when the line voltage is equal to or higher than the reference voltage. Display on the screen.

請求項１記載の漏れ電流測定装置では、処理部が、基準電圧と電圧検出部によって検出された線路間電圧とを比較して、線路間電圧が基準電圧未満のときには、有効漏れ電流を算出することなく、電流検出部によって検出された漏れ電流のみを表示部に表示させ、線路間電圧が基準電圧以上のときには、線路間電圧と漏れ電流とに基づいて有効漏れ電流を算出して漏れ電流と共に表示部に表示させる。したがって、この漏れ電流測定装置によれば、電圧検出部の一対の測定対象電線路への接続作業を失念したときや、接続作業自体は行ったものの接続不良が発生しているときにおいても、つまり電圧検出部の各測定対象電線路への接続の如何に拘わらず、各測定対象電線路への電流センサの装着（クランプ）がなされているときには、検出された漏れ電流が表示部に常に表示されるため、表示されている漏れ電流を絶縁点検の管理基準と比較することにより、各測定対象電線路の絶縁点検を確実に実施することができる。一例として、表示されている漏れ電流が所定の基準値以下であれば、各測定対象電線路の絶縁状態が管理基準を満たす状態にあると判別することができる。   In the leakage current measuring apparatus according to claim 1, the processing unit compares the reference voltage and the line voltage detected by the voltage detection unit, and calculates the effective leakage current when the line voltage is less than the reference voltage. Without displaying the leakage current detected by the current detection unit on the display unit, when the line voltage is equal to or higher than the reference voltage, the effective leakage current is calculated based on the line voltage and the leakage current together with the leakage current. Display on the display. Therefore, according to this leakage current measuring device, even when the connection work of the voltage detection unit to the pair of measurement target electric wires is forgotten, or when the connection work itself is performed but a connection failure occurs, that is, Regardless of whether the voltage detector is connected to each measurement target conduit, when the current sensor is attached (clamped) to each measurement target conduit, the detected leakage current is always displayed on the display. Therefore, by comparing the displayed leakage current with the insulation inspection management standard, it is possible to reliably carry out insulation inspection of each measurement target electrical line. As an example, if the displayed leakage current is equal to or less than a predetermined reference value, it can be determined that the insulation state of each measurement target electrical line satisfies the management standard.

請求項２記載の漏れ電流測定装置によれば、線路間電圧が基準電圧未満のときに、処理部が線路間電圧を検出できない旨を表示部に表示させることにより、作業者に対して、線路間電圧を検出できない旨を明確に認識させることができると共に、この旨の表示の有無に基づいて、電圧検出部の各電線路への接続状態を確実に判別させることができる。   According to the leakage current measuring apparatus according to claim 2, when the line-to-line voltage is less than the reference voltage, the processing unit displays on the display unit that the line-to-line voltage cannot be detected. It is possible to clearly recognize that the inter-voltage cannot be detected, and it is possible to reliably determine the connection state of the voltage detection unit to each electric line based on the presence / absence of this indication.

請求項３記載の漏れ電流測定装置によれば、線路間電圧が基準電圧以上のときに、処理部が線路間電圧を表示部に表示させることにより、各測定対象電線路についての絶縁検査と併せて、作業者に対して線路間電圧の電圧値を認識させることができる。   According to the leakage current measuring apparatus according to claim 3, when the line voltage is equal to or higher than the reference voltage, the processing unit displays the line voltage on the display unit, thereby combining the insulation inspection for each measurement target electric line. Thus, the operator can recognize the voltage value of the line-to-line voltage.

以下、添付図面を参照して、本発明に係る漏れ電流測定装置の最良の形態について説明する。   The best mode of a leakage current measuring apparatus according to the present invention will be described below with reference to the accompanying drawings.

最初に、漏れ電流測定装置１について、図面を参照して説明する。   First, the leakage current measuring apparatus 1 will be described with reference to the drawings.

漏れ電流測定装置１は、図１に示すように、電流検出部２、電圧検出部３、処理部４、記憶部５、表示部６および電池７を備え、電池７から供給される電池電力で作動して、測定対象電線路（以下、「電線路」ともいう）１１，１２についての漏れ電流を測定することによって電線路１１，１２（一例として、単相２線式電線路）の絶縁状態を検査可能に構成されている。なお、本例における電線路１１，１２間には交流電圧（本発明における線路間電圧）Ｖ１が供給されており、かつ電線路１１，１２と大地との間には漏れ電流Ｉｏが発生しているものとする。また、この漏れ電流Ｉｏは、抵抗成分を流れる有効漏れ電流Ｉｏｒと静電容量成分を流れる無効漏れ電流Ｉｏｃとで構成されているものとする。   As shown in FIG. 1, the leakage current measuring apparatus 1 includes a current detection unit 2, a voltage detection unit 3, a processing unit 4, a storage unit 5, a display unit 6, and a battery 7, and uses battery power supplied from the battery 7. The insulation state of the electric lines 11, 12 (single-phase, two-wire electric lines as an example) by operating and measuring the leakage current of the electric lines 11 and 12 to be measured (hereinafter also referred to as "electric lines") It is configured to be inspectable. Note that an AC voltage (inter-line voltage in the present invention) V1 is supplied between the electric lines 11 and 12 in this example, and a leakage current Io is generated between the electric lines 11 and 12 and the ground. It shall be. The leakage current Io is composed of an effective leakage current Ior that flows through a resistance component and an invalid leakage current Ioc that flows through a capacitance component.

電流検出部２は、図１に示すように、電線路１１，１２全体をクランプ可能に構成されたクランプ型電流センサ２ａ（本発明における電流センサ。以下、「電流センサ２ａ」ともいう）、および変換部２ｂを備えている。この場合、電流センサ２ａは、同図に示すように、電線路１１，１２全体をまとめてクランプすることにより、漏れ電流Ｉｏを検出して、漏れ電流Ｉｏに比例して振幅が変化する電圧信号Ｓｉを出力する。変換部２ｂは、Ａ／Ｄ変換器（図示せず）を備えて構成されて、電圧信号Ｓｉを入力すると共にサンプリングして、その振幅を示すデータＤｉを出力する。電圧検出部３は、一対の電圧プローブ３ａ，３ａおよびＡ／Ｄ変換器（図示せず）を備え、各電圧プローブ３ａ，３ａ間に入力される電圧をサンプリングして、その電圧値（振幅）を示すデータＤｖを出力する。この構成により、電圧検出部３は、電圧プローブ３ａ，３ａが電線路１１，１２に接続されたときには、電線路１１，１２に供給されている交流電圧Ｖ１の信号波形を示すデータＤｖを出力し、電圧プローブ３ａ，３ａが未接続のときには、ゼロボルトを示すデータＤｖを出力する。   As shown in FIG. 1, the current detection unit 2 includes a clamp-type current sensor 2 a configured to be able to clamp the entire electric wires 11 and 12 (current sensor in the present invention; hereinafter, also referred to as “current sensor 2 a”), and A conversion unit 2b is provided. In this case, as shown in the figure, the current sensor 2a detects the leakage current Io by clamping the entire electric wires 11 and 12, and the voltage signal whose amplitude changes in proportion to the leakage current Io. Si is output. The conversion unit 2b includes an A / D converter (not shown), inputs and samples the voltage signal Si, and outputs data Di indicating the amplitude. The voltage detector 3 includes a pair of voltage probes 3a and 3a and an A / D converter (not shown), samples a voltage input between the voltage probes 3a and 3a, and outputs a voltage value (amplitude). Is output. With this configuration, when the voltage probes 3a and 3a are connected to the electric lines 11 and 12, the voltage detector 3 outputs data Dv indicating the signal waveform of the AC voltage V1 supplied to the electric lines 11 and 12. When the voltage probes 3a and 3a are not connected, data Dv indicating zero volts is output.

処理部４は、ＣＰＵ（図示せず）を備えて構成されて、入力した各データＤｉ，Ｄｖに基づいて、漏れ電流Ｉｏの電流値（本例では実効値。以下、この実効値を「漏れ電流Ｉｏ」とも表す）および交流電圧Ｖ１の電圧値（本例では実効値。以下、この実効値を「交流電圧Ｖ１」とも表す）を検出する検出処理、交流電圧Ｖ１についての電圧比較処理、有効漏れ電流Ｉｏｒの算出処理、および表示処理を実行する。この場合、処理部４は、表示処理において、検出した漏れ電流Ｉｏおよび交流電圧Ｖ１の各実効値、算出した有効漏れ電流Ｉｏｒ、交流電圧Ｖ１を検出できない（検出していない）旨を示す文字や記号や図形（本例では一例として記号「−−−」）、および有効漏れ電流Ｉｏｒを算出できない旨を示す文字や記号や図形（本例では一例として記号「−−−」）を表示部６に表示させる。記憶部５は、ＲＯＭおよびＲＡＭなどの半導体メモリで構成されて、ＣＰＵについての動作プログラム、および処理部４による電圧比較処理において使用される基準電圧Ｖｒが予め記憶されている。また、記憶部５は、処理部４のワークメモリとしても機能する。   The processing unit 4 includes a CPU (not shown), and based on the input data Di and Dv, the current value of the leakage current Io (effective value in this example. Hereinafter, this effective value is referred to as “leakage”. Detection process for detecting the voltage value of the AC voltage V1 (in this example, the effective value; hereinafter, this effective value is also referred to as “AC voltage V1”), voltage comparison processing for the AC voltage V1, and effective. The calculation process and the display process of the leakage current Ior are executed. In this case, the processing unit 4 displays characters indicating that the effective values of the detected leakage current Io and the alternating voltage V1, the calculated effective leakage current Ior, and the alternating voltage V1 cannot be detected (not detected) in the display process. Display unit 6 displays symbols and figures (in this example, symbol “---” as an example) and characters, symbols, and figures (in this example, symbol “---” as an example) indicating that effective leakage current Ior cannot be calculated. To display. The storage unit 5 includes a semiconductor memory such as a ROM and a RAM, and stores in advance an operation program for the CPU and a reference voltage Vr used in a voltage comparison process by the processing unit 4. The storage unit 5 also functions as a work memory for the processing unit 4.

表示部６は、一例としてディスプレイ装置で構成されて、上記の表示処理において処理部４から出力される漏れ電流Ｉｏ、有効漏れ電流Ｉｏｒおよび交流電圧Ｖ１を示す表示データＤｄを入力したときには、これらを自らの表示画面６ａ（図２参照）上の所定の表示位置に表示し、交流電圧Ｖ１を示す表示データＤｄに代えて、交流電圧Ｖ１を検出できない旨を示すデータを入力したときには、その旨を示す記号「−−−」を交流電圧Ｖ１の表示位置に交流電圧Ｖ１に代えて表示し、有効漏れ電流Ｉｏｒを示す表示データＤｄに代えて、有効漏れ電流Ｉｏｒを算出できない旨を示すデータを入力したときには、その旨を示す記号「−−−」を有効漏れ電流Ｉｏｒの表示位置に有効漏れ電流Ｉｏｒに代えて表示する。   The display unit 6 is configured by a display device as an example. When the display data Dd indicating the leakage current Io, the effective leakage current Ior, and the AC voltage V1 output from the processing unit 4 in the display process is input, these are displayed. When data indicating that the AC voltage V1 cannot be detected is input instead of the display data Dd indicating the AC voltage V1 displayed at a predetermined display position on its own display screen 6a (see FIG. 2), this fact is indicated. The symbol “---” is displayed in place of the AC voltage V1 at the display position of the AC voltage V1, and data indicating that the effective leakage current Ior cannot be calculated is input instead of the display data Dd indicating the effective leakage current Ior. In such a case, the symbol “---” indicating that is displayed instead of the effective leakage current Ior at the display position of the effective leakage current Ior.

続いて、漏れ電流測定装置１による電線路１１，１２についての交流電圧Ｖ１、漏れ電流Ｉｏおよび有効漏れ電流Ｉｏｒの測定動作に関して、図１〜５を参照して説明する。なお、電流検出部２については、その電流センサ２ａが電線路１１，１２全体をまとめてクランプするように電線路１１，１２に予め装着され、電圧検出部３については、その電圧プローブ３ａ，３ａが各電線路１１，１２に予め装着されているものとする。   Then, the measurement operation | movement of AC voltage V1, the leakage current Io, and the effective leakage current Ior about the electric wires 11 and 12 by the leakage current measuring apparatus 1 is demonstrated with reference to FIGS. In addition, about the electric current detection part 2, the electric current sensor 2a is previously mounted | worn with the electric wire paths 11 and 12 so that the electric wire lines 11 and 12 may be clamped collectively, and about the voltage detection part 3, the voltage probes 3a and 3a are attached. Are preinstalled in each of the electric lines 11 and 12.

漏れ電流測定装置１の作動状態において、電流検出部２は、電線路１１，１２に発生している漏れ電流Ｉｏを繰り返し検出してデータＤｉを出力し、電圧検出部３は、電線路１１，１２間の交流電圧Ｖ１を繰り返し測定してデータＤｖを出力する。処理部４は、この状態において、各データＤｉ，Ｄｖを繰り返し入力して、漏れ電流Ｉｏおよび交流電圧Ｖ１の各波形を示すデータとして記憶部５にそれぞれ記憶させる。   In the operating state of the leakage current measuring apparatus 1, the current detection unit 2 repeatedly detects the leakage current Io generated in the electric lines 11 and 12 and outputs data Di, and the voltage detection unit 3 The AC voltage V1 between 12 is repeatedly measured and data Dv is output. In this state, the processing unit 4 repeatedly inputs the data Di and Dv and stores them in the storage unit 5 as data indicating the waveforms of the leakage current Io and the AC voltage V1, respectively.

また、処理部４は、上記の記憶部５への各データＤｉ，Ｄｖの記憶処理を実行しつつ、所定の周期で、図５に示す測定処理１００を繰り返し実行する。この測定処理１００では、処理部４は、まず、漏れ電流Ｉｏおよび交流電圧Ｖ１を検出する検出処理を実行する（ステップ１０１）。この検出処理では、処理部４は、記憶部５に記憶されているデータＤｉに基づいて漏れ電流Ｉｏ（漏れ電流の実効値）を検出（算出）すると共に、記憶部５に記憶されているデータＤｖに基づいて交流電圧Ｖ１（交流電圧の実効値）を検出（算出）して、検出した漏れ電流Ｉｏおよび交流電圧Ｖ１を記憶部５に記憶させる。   Further, the processing unit 4 repeatedly executes the measurement process 100 shown in FIG. 5 at a predetermined cycle while executing the storage process of the data Di and Dv in the storage unit 5 described above. In the measurement process 100, the processing unit 4 first executes a detection process for detecting the leakage current Io and the AC voltage V1 (step 101). In this detection process, the processing unit 4 detects (calculates) the leakage current Io (effective value of leakage current) based on the data Di stored in the storage unit 5 and the data stored in the storage unit 5. The AC voltage V1 (effective value of AC voltage) is detected (calculated) based on Dv, and the detected leakage current Io and AC voltage V1 are stored in the storage unit 5.

次いで、処理部４は、交流電圧Ｖ１を検出する都度、電圧比較処理を実行する（ステップ１０２）。この電圧比較処理では、処理部４は、記憶部５から交流電圧Ｖ１と基準電圧Ｖｒとを読み出して、両者を比較する。この比較の結果、交流電圧Ｖ１が基準電圧Ｖｒ以上のときには、処理部４は、有効漏れ電流Ｉｏｒの算出処理を実行する（ステップ１０３）。この算出処理では、処理部４は、記憶部５に記憶されているデータＤｖを利用して、記憶部５に記憶されているデータＤｉで表される漏れ電流Ｉｏからその有効成分を分離することにより、有効漏れ電流Ｉｏｒ（本例ではその実効値）を算出する。また、処理部４は、算出した有効漏れ電流Ｉｏｒを記憶部５に記憶させる。   Next, each time the processing unit 4 detects the AC voltage V1, it performs a voltage comparison process (step 102). In this voltage comparison process, the processing unit 4 reads the AC voltage V1 and the reference voltage Vr from the storage unit 5 and compares them. As a result of the comparison, when the AC voltage V1 is equal to or higher than the reference voltage Vr, the processing unit 4 executes a process for calculating the effective leakage current Ior (step 103). In this calculation process, the processing unit 4 uses the data Dv stored in the storage unit 5 to separate the effective component from the leakage current Io represented by the data Di stored in the storage unit 5. Thus, an effective leakage current Ior (its effective value in this example) is calculated. Further, the processing unit 4 stores the calculated effective leakage current Ior in the storage unit 5.

上記の算出処理を完了した後、または上記のステップ１０２の電圧比較処理において交流電圧Ｖ１が基準電圧Ｖｒ未満であるとの比較結果のときには、処理部４は、表示処理を実行する（ステップ１０４）。この表示処理では、処理部４は、ステップ１０３を実行して有効漏れ電流Ｉｏｒを算出したときには、記憶部５から有効漏れ電流Ｉｏｒ、漏れ電流Ｉｏおよび交流電圧Ｖ１を読み出すと共に、これらを示す表示データＤｄを表示部６に出力する。これにより、表示部６は、この表示データＤｄを入力して、図２に示すように、この表示データＤｄで示される有効漏れ電流Ｉｏｒ、漏れ電流Ｉｏおよび交流電圧Ｖ１についての各数値をそれぞれの測定値として表示画面６ａ上に表示させる。これにより、測定処理１００が完了する。   After completing the above calculation process, or when the comparison result indicates that the AC voltage V1 is less than the reference voltage Vr in the voltage comparison process in step 102, the processing unit 4 executes the display process (step 104). . In this display process, when the processing unit 4 executes step 103 and calculates the effective leakage current Ior, the processing unit 4 reads out the effective leakage current Ior, the leakage current Io, and the AC voltage V1 from the storage unit 5, and display data indicating these. Dd is output to the display unit 6. As a result, the display unit 6 inputs the display data Dd, and, as shown in FIG. 2, the numerical values for the effective leakage current Ior, the leakage current Io, and the AC voltage V1 indicated by the display data Dd are displayed. The measured value is displayed on the display screen 6a. Thereby, the measurement process 100 is completed.

一方、ステップ１０２の電圧比較処理において交流電圧Ｖ１が基準電圧Ｖｒ未満であるとの比較結果のとき、すなわち有効漏れ電流Ｉｏｒを算出していないときには、処理部４は、記憶部５から漏れ電流Ｉｏを読み出して、この漏れ電流Ｉｏ、交流電圧Ｖ１を検出できない旨を示す記号「−−−」、および有効漏れ電流Ｉｏｒを算出できない旨を示す記号「−−−」を示す表示データＤｄを表示部６に出力する。これにより、表示部６は、この表示データＤｄを入力して、図３に示すように、この表示データＤｄで示される漏れ電流Ｉｏ（漏れ電流の実効値）を示す数値を表示画面６ａ上に表示させると共に、有効漏れ電流Ｉｏｒおよび交流電圧Ｖ１の各数値を表示させる位置（表示位置）に記号「−−−」をそれぞれ表示させる。これにより、測定処理１００が完了する。   On the other hand, when the comparison result indicates that the AC voltage V1 is less than the reference voltage Vr in the voltage comparison process of step 102, that is, when the effective leakage current Ior is not calculated, the processing unit 4 reads the leakage current Io from the storage unit 5. Is displayed, and the display data Dd indicating the symbol “---” indicating that the leakage current Io and the AC voltage V1 cannot be detected and the symbol “---” indicating that the effective leakage current Ior cannot be calculated are displayed on the display unit. 6 is output. Thereby, the display unit 6 inputs the display data Dd, and as shown in FIG. 3, a numerical value indicating the leakage current Io (effective value of leakage current) indicated by the display data Dd is displayed on the display screen 6a. At the same time, the symbol “---” is displayed at the position (display position) where the numerical values of the effective leakage current Ior and the AC voltage V1 are displayed. Thereby, the measurement process 100 is completed.

このように、この漏れ電流測定装置１では、処理部４が、基準電圧Ｖｒと、電圧検出部３によって検出された交流電圧Ｖ１とを比較して、交流電圧Ｖ１が基準電圧Ｖｒ未満のときには、有効漏れ電流Ｉｏｒを算出することなく、電流検出部２によって検出された漏れ電流Ｉｏのみを表示部６に表示させ、交流電圧Ｖ１が基準電圧Ｖｒ以上のときには、交流電圧Ｖ１と漏れ電流Ｉｏとに基づいて有効漏れ電流Ｉｏｒを算出して漏れ電流Ｉｏと共に表示部６に表示させる。なお、上記の「漏れ電流Ｉｏのみを表示部６に表示させ」とは、漏れ電流Ｉｏ、交流電圧Ｖ１および有効漏れ電流Ｉｏｒのうちでは漏れ電流Ｉｏだけを表示させることを意味するものであり、交流電圧Ｖ１および有効漏れ電流Ｉｏｒ以外の他の情報を漏れ電流Ｉｏと共に表示部６に表示させることを除外することを意味するものではない。   Thus, in the leakage current measuring apparatus 1, the processing unit 4 compares the reference voltage Vr with the AC voltage V1 detected by the voltage detection unit 3, and when the AC voltage V1 is less than the reference voltage Vr, Without calculating the effective leakage current Ior, only the leakage current Io detected by the current detection unit 2 is displayed on the display unit 6, and when the AC voltage V1 is equal to or higher than the reference voltage Vr, the AC voltage V1 and the leakage current Io are displayed. Based on this, the effective leakage current Ior is calculated and displayed on the display unit 6 together with the leakage current Io. The above-mentioned “display only the leakage current Io on the display unit 6” means that only the leakage current Io is displayed among the leakage current Io, the AC voltage V1, and the effective leakage current Ior. It does not mean that other information other than the AC voltage V1 and the effective leakage current Ior is displayed on the display unit 6 together with the leakage current Io.

したがって、この漏れ電流測定装置１によれば、電圧検出部３の電線路１１，１２への接続作業を失念したときや、接続作業自体は行ったものの接続不良が発生しているときにおいても、つまり電圧検出部３の電線路１１，１２への接続の如何に拘わらず、各電線路１１，１２へのクランプ型電流センサ２ａの装着がなされているときには、検出された漏れ電流Ｉｏが表示部６に常に表示されるため、表示されている漏れ電流Ｉｏを絶縁点検の管理基準と比較することにより、各電線路１１，１２の絶縁点検を確実に実施することができる。一例として、表示されている漏れ電流Ｉｏが所定の基準値（例えば、１ｍＡ）以下であれば、各電線路１１，１２の絶縁状態が管理基準を満たす状態にあると判別することができる。   Therefore, according to the leakage current measuring apparatus 1, when the connection work of the voltage detection unit 3 to the electric wires 11 and 12 is forgotten, or when the connection work itself is performed but a connection failure occurs, That is, when the clamp type current sensor 2a is attached to each of the electric lines 11, 12, regardless of whether the voltage detection unit 3 is connected to the electric lines 11, 12, the detected leakage current Io is displayed on the display unit. 6 is always displayed, by comparing the displayed leakage current Io with the management standard for insulation inspection, the insulation inspection of each of the electric lines 11 and 12 can be performed reliably. As an example, if the displayed leakage current Io is equal to or less than a predetermined reference value (for example, 1 mA), it can be determined that the insulation state of each of the electrical lines 11 and 12 is in a state satisfying the management standard.

一方、表示されている漏れ電流Ｉｏが所定の基準値を超えているときには、この漏れ電流Ｉｏと基準値との比較だけでは、各電線路１１，１２の絶縁状態を点検できないため、有効漏れ電流Ｉｏｒに基づいて絶縁状態を点検することになる。したがって、表示部６に交流電圧Ｖ１が表示されていないときには、作業者は、電圧検出部３を各電線路１１，１２に正常に接続する作業を実施する。これにより、電圧検出部３が交流電圧Ｖ１を検出できる状態となり、処理部４が各データＤｖ，Ｄｉに基づいて、有効漏れ電流Ｉｏｒを算出して、交流電圧Ｖ１と共に表示部６に表示させる。したがって、表示部６に表示された有効漏れ電流Ｉｏｒに基づいて、各電線路１１，１２の絶縁状態を確実に点検することができる。   On the other hand, when the displayed leakage current Io exceeds a predetermined reference value, the insulation state of the electric lines 11 and 12 cannot be inspected only by comparing the leakage current Io with the reference value. The insulation state will be checked based on Ior. Therefore, when the AC voltage V1 is not displayed on the display unit 6, the operator performs an operation of normally connecting the voltage detection unit 3 to the electric lines 11, 12. As a result, the voltage detection unit 3 can detect the AC voltage V1, and the processing unit 4 calculates the effective leakage current Ior based on the data Dv and Di, and displays the effective leakage current Ior on the display unit 6 together with the AC voltage V1. Therefore, based on the effective leakage current Ior displayed on the display unit 6, it is possible to reliably check the insulation state of the electric lines 11 and 12.

また、この漏れ電流測定装置１によれば、交流電圧Ｖ１が基準電圧Ｖｒ未満のときに、処理部４が交流電圧Ｖ１を検出できない旨（本例では一例としてその旨を示す記号「−−−」）を表示部６に表示させることにより、作業者に対して、交流電圧Ｖ１を検出できない旨を明確に認識させることができると共に、この旨の表示の有無に基づいて、電圧検出部３の各電線路１１，１２への接続状態を確実に判別させることができる。   Further, according to the leakage current measuring apparatus 1, when the AC voltage V1 is less than the reference voltage Vr, the processing unit 4 cannot detect the AC voltage V1 (in this example, as an example, the symbol “--- ”) Is displayed on the display unit 6 so that the operator can clearly recognize that the AC voltage V1 cannot be detected, and the voltage detection unit 3 It is possible to reliably determine the connection state to each of the electric lines 11 and 12.

また、この漏れ電流測定装置１によれば、交流電圧Ｖ１が基準電圧Ｖｒ以上のときに、処理部４が交流電圧Ｖ１を表示部６に表示させることにより、電線路１１，１２についての絶縁検査と併せて、作業者に対して交流電圧Ｖ１の電圧値（本例では実効値）を認識させることができる。   In addition, according to the leakage current measuring apparatus 1, when the AC voltage V1 is equal to or higher than the reference voltage Vr, the processing unit 4 displays the AC voltage V1 on the display unit 6 so that the insulation inspection of the electric lines 11 and 12 is performed. In addition, the operator can recognize the voltage value (effective value in this example) of the AC voltage V1.

なお、本発明は、上記の構成に限定されない。例えば、交流電圧Ｖ１が基準電圧Ｖｒ未満のときに、交流電圧Ｖ１が検出されていない旨（本例では一例としてその旨を示す記号「−−−」）を表示部６に表示させる構成に代えて、図４に示すように、表示画面６ａにおける交流電圧Ｖ１の表示位置に何も表示させない構成を採用することができるのは勿論である。この場合、交流電圧Ｖ１が検出されていないため、有効漏れ電流Ｉｏｒも算出できない結果、有効漏れ電流Ｉｏｒの数値の表示位置にも何も表示されない。この構成を採用した漏れ電流測定装置１においても、各電線路１１，１２へのクランプ型電流センサ２ａの装着がなされているときには、漏れ電流Ｉｏの電流値（本例では実効値）が表示部６に常に表示されるため、表示されている漏れ電流Ｉｏを絶縁点検の管理基準と比較することにより、各電線路１１，１２の絶縁点検を確実に実施することができる。一例として、表示されている漏れ電流Ｉｏ（漏れ電流の実効値）が所定の基準値（例えば、１ｍＡ）以下であれば、各電線路１１，１２の絶縁状態が管理基準を満たす状態にあると判別することができる。   In addition, this invention is not limited to said structure. For example, when the AC voltage V1 is less than the reference voltage Vr, the display unit 6 displays a message indicating that the AC voltage V1 is not detected (in this example, the symbol “---” indicating that). Of course, as shown in FIG. 4, it is possible to employ a configuration in which nothing is displayed at the display position of the AC voltage V1 on the display screen 6a. In this case, since the AC voltage V1 is not detected, the effective leakage current Ior cannot be calculated. As a result, nothing is displayed at the numerical display position of the effective leakage current Ior. Also in the leakage current measuring apparatus 1 adopting this configuration, when the clamp-type current sensor 2a is attached to each of the electric lines 11, 12, the current value (effective value in this example) of the leakage current Io is displayed on the display unit. 6 is always displayed, by comparing the displayed leakage current Io with the management standard for insulation inspection, the insulation inspection of each of the electrical lines 11 and 12 can be performed reliably. As an example, if the displayed leakage current Io (effective value of leakage current) is equal to or less than a predetermined reference value (for example, 1 mA), the insulation state of each of the electrical lines 11 and 12 is in a state satisfying the management standard. Can be determined.

また、電池７で作動する構成に代えて、電線路１１，１２以外の電源系統から電力が供給される構成を採用することもできる。また、表示部６を備えた構成に代えて、表示部を外部装置として備えて、その表示部に漏れ電流Ｉｏの電流値、有効漏れ電流Ｉｏｒおよび交流電圧Ｖ１を表示させる構成を採用することもできる。また、単相２線式電線路に漏れ電流測定装置１を使用する例について上記したが、単相３線式電線路、三相３線式電線路および三相４線式電線路についての絶縁状態の点検においても漏れ電流測定装置１を使用することができるのは勿論である。   Moreover, it can replace with the structure which operate | moves with the battery 7, and the structure to which electric power is supplied from power supply systems other than the electric wire paths 11 and 12 can also be employ | adopted. Further, instead of the configuration including the display unit 6, a configuration in which the display unit is provided as an external device and the current value of the leakage current Io, the effective leakage current Ior, and the AC voltage V1 are displayed on the display unit may be adopted. it can. Moreover, although it described above about the example which uses the leakage current measuring apparatus 1 for a single-phase two-wire electric line, insulation about a single-phase three-wire electric line, a three-phase three-wire electric line, and a three-phase four-wire electric line Of course, the leakage current measuring apparatus 1 can also be used in checking the state.

漏れ電流測定装置１の構成図である。1 is a configuration diagram of a leakage current measuring device 1. FIG. 表示画面６ａ上での漏れ電流Ｉｏ、有効漏れ電流Ｉｏｒおよび交流電圧Ｖ１の表示状態を示す表示部６の正面図である。It is a front view of the display part 6 which shows the display state of the leakage current Io on the display screen 6a, the effective leakage current Ior, and AC voltage V1. 表示画面６ａ上での漏れ電流Ｉｏ、有効漏れ電流Ｉｏｒおよび交流電圧Ｖ１の表示状態を示す表示部６の正面図である。It is a front view of the display part 6 which shows the display state of the leakage current Io on the display screen 6a, the effective leakage current Ior, and AC voltage V1. 表示画面６ａ上での漏れ電流Ｉｏ、有効漏れ電流Ｉｏｒおよび交流電圧Ｖ１の表示状態を示す表示部６の正面図である。It is a front view of the display part 6 which shows the display state of the leakage current Io on the display screen 6a, the effective leakage current Ior, and AC voltage V1. 漏れ電流測定装置１の測定処理を説明するためのフローチャートである。3 is a flowchart for explaining measurement processing of the leakage current measuring apparatus 1;

符号の説明Explanation of symbols

１ 漏れ電流測定装置
２ 電流検出部
２ａ クランプ型センサ
３ 電圧検出部
４ 処理部
６ 表示部
１１，１２ 電線路
Ｉｏ 漏れ電流
Ｉｏｒ 有効漏れ電流
Ｖ１ 交流電圧
Ｖｒ 基準電圧 DESCRIPTION OF SYMBOLS 1 Leakage current measuring device 2 Current detection part 2a Clamp type sensor 3 Voltage detection part 4 Processing part 6 Display part 11,12 Electric wire line Io Leakage current Ior Effective leakage current V1 AC voltage Vr Reference voltage

Claims (3)

一対の測定対象電線路にクランプされて当該測定対象電線路に流れる漏れ電流を検出する電流センサを備えた電流検出部と、
前記一対の測定対象電線路についての線路間電圧を検出する電圧検出部と、
前記電圧検出部によって検出された前記線路間電圧、および前記電流検出部で検出された前記漏れ電流に基づいて有効漏れ電流を算出可能な処理部とを備え、
前記処理部は、前記電圧検出部によって検出された前記線路間電圧が予め規定された基準電圧未満のときには、前記有効漏れ電流を算出することなく、前記電流検出部で検出された前記漏れ電流を表示部に表示させ、当該線路間電圧が当該基準電圧以上のときには、前記有効漏れ電流を算出して前記漏れ電流と共に前記表示部に表示させる漏れ電流測定装置。 A current detection unit including a current sensor that is clamped by a pair of measurement target electric lines and detects a leakage current flowing through the measurement target electric lines;
A voltage detection unit for detecting a line-to-line voltage for the pair of measurement target electric lines;
The line voltage detected by the voltage detection unit, and a processing unit capable of calculating an effective leakage current based on the leakage current detected by the current detection unit,
The processing unit calculates the leakage current detected by the current detection unit without calculating the effective leakage current when the line-to-line voltage detected by the voltage detection unit is less than a predetermined reference voltage. A leakage current measuring device that displays on a display unit and calculates the effective leakage current and displays the effective leakage current on the display unit together with the leakage current when the line voltage is equal to or higher than the reference voltage. 前記処理部は、前記線路間電圧が前記基準電圧未満のときには、当該線路間電圧が検出されていない旨を前記表示部に表示させる請求項１記載の漏れ電流測定装置。   The leakage current measuring device according to claim 1, wherein when the line voltage is less than the reference voltage, the processing unit displays on the display unit that the line voltage is not detected. 前記処理部は、前記線路間電圧が前記基準電圧以上のときには、当該線路間電圧を前記表示部に表示させる請求項１または２記載の漏れ電流測定装置。   The leakage current measuring device according to claim 1, wherein when the line voltage is equal to or higher than the reference voltage, the processing unit displays the line voltage on the display unit.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012042418A (en) * 2010-08-23 2012-03-01 Chugoku Electric Power Co Inc:The Insulation monitoring device

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JPH09218228A (en) * 1996-02-09 1997-08-19 Masami Akatani Method and apparatus for measuring leakage current
JPH1068749A (en) * 1996-08-27 1998-03-10 Tempearl Ind Co Ltd Resistive component leakage meter
JP2001183405A (en) * 1999-12-24 2001-07-06 Hokuto Denshi Kogyo Kk Diagnostic device electrical apparatus
JP2002131362A (en) * 2000-10-23 2002-05-09 Soronju Japan:Kk Leakage current measurement device
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Publication number Priority date Publication date Assignee Title
JPH09218228A (en) * 1996-02-09 1997-08-19 Masami Akatani Method and apparatus for measuring leakage current
JPH1068749A (en) * 1996-08-27 1998-03-10 Tempearl Ind Co Ltd Resistive component leakage meter
JP2001183405A (en) * 1999-12-24 2001-07-06 Hokuto Denshi Kogyo Kk Diagnostic device electrical apparatus
JP2002131362A (en) * 2000-10-23 2002-05-09 Soronju Japan:Kk Leakage current measurement device
JP2006038604A (en) * 2004-07-27 2006-02-09 Multi Keisokuki Kk Leakage current measuring instrument

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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