JP7797218B2 - Connection failure detection device - Google Patents
Connection failure detection deviceInfo
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Description
本発明は、端子部等の電路接続部の接続不良を検出する接続不良検出装置に関する。 The present invention relates to a connection failure detection device that detects connection failures in electrical circuit connections such as terminals.
電線や導体バー等の電路を接続する電路接続部では、ネジの緩み、プラグの緩み等により接続不良が発生することがある。配電路や電力機器への電路等の比較的大電流を通電する接続部において接続不良が発生すると、接触抵抗の増大により発熱して機器が劣化し、更にはアーク放電が発生して最悪火災に至る場合がある。
そのため、これを回避するための接続不良の発生を検出する装置として、例えば特許文献１に開示された技術がある。特許文献１では、端子間の電位差でオン動作するようフォトカプラを配置して、このフォトカプラのオン動作により接続不良を検知させた。
At electrical circuit connections where electrical circuits such as electric wires and conductor bars are connected, connection failures can occur due to loose screws, loose plugs, etc. If a connection failure occurs at a connection through which a relatively large current flows, such as in a distribution line or an electrical circuit to power equipment, the increased contact resistance can cause heat generation, which can deteriorate the equipment and, in the worst case, can even cause arc discharge, which can lead to a fire.
To prevent this, a device for detecting the occurrence of a connection failure is disclosed in, for example, Patent Document 1. In Patent Document 1, a photocoupler is arranged so that it turns on when there is a potential difference between terminals, and a connection failure is detected when this photocoupler turns on.
上記従来の接続不良を検出する技術は、端子間に発生する電圧降下が所定の値になったら接続不良発生と判断する構成となっている。この場合、接続部に流れる電流値は接続不良を判断する物理量ではないため、電圧降下量が同一であっても、接続不良発生と判断した時点での発熱量が様々であった。
例えば、判定する電圧降下量が１．０Ｖであるとすると、電路電流が５Ａの場合、接触抵抗が０．２Ωとなったら１．０Ｖの電圧降下が発生する。また電路電流が２５Ａの場合、０．０４Ωとなったら電圧降下は１．０Ｖとなる。一方、接続不良検出時の発生電力（発熱量）を見ると、電力＝電圧×電流であるから、電路電流５Ａでは５Ｗ、２５Ａでは２５Ｗとなり、５倍の差が発生する。
このように、電圧降下量で検出する場合、電路電流が大きい場合は発熱量が大きくなるため、接続不良を検出した時点では既に危険な状態となってにる場合があった。
The conventional technology for detecting a connection failure is configured to determine that a connection failure has occurred when the voltage drop occurring between the terminals reaches a predetermined value. In this case, the current value flowing through the connection is not a physical quantity used to determine a connection failure, so even if the voltage drop amount is the same, the amount of heat generated at the time when the connection failure is determined to have occurred varies.
For example, if the voltage drop to be determined is 1.0 V, when the circuit current is 5 A and the contact resistance is 0.2 Ω, a voltage drop of 1.0 V will occur. Also, when the circuit current is 25 A and the contact resistance is 0.04 Ω, the voltage drop will be 1.0 V. On the other hand, when looking at the power generated (heat generation) when a poor connection is detected, since power = voltage x current, a circuit current of 5 A is 5 W, and a circuit current of 25 A is 25 W, resulting in a five-fold difference.
In this way, when detecting the voltage drop, if the current in the circuit is large, the amount of heat generated is large, and so there are cases where a dangerous condition has already been reached by the time a connection failure is detected.
そこで、本発明はこのような問題点に鑑み、電路電流が大きい状態で接続不良が発生しても、発熱温度が高温になる前に接続不良を検出できる接続不良検出装置を提供することを目的としている。 In light of these problems, the present invention aims to provide a connection failure detection device that can detect connection failures before the heat generation temperature reaches a high level, even when a connection failure occurs when the circuit current is high.
上記課題を解決する為に、請求項１の発明は、負荷に交流電力を供給するために、交流電源が接続された電路に設けられた電路接続部の接続不良を検出する接続不良検出装置であって、電路接続部は、電源側の電路が接続される電源側端子と、負荷側の電路が接続される負荷側端子とを有し、接続不良発生を判断する閾値電圧を電路電流に応じて変動させる感度設定部と、電源側端子と負荷側端子との間の電位差を監視して閾値電圧と比較判定する電位差判定部と、交流電源と同位相の調整電流を生成して、電源側端子と負荷側端子の間に、交流電源から供給される電流に追加して流す調整電流生成部と、電源側端子と負荷側端子との間に流れる全電流を計測する全電流計測部と、接続不良発生を通知する通知部と、を有し、感度設定部は全電流計測部の計測電流値に比例係数が負の比例関係を有する閾値電圧を生成すると共に、電位差判定部は、電源側端子と負荷側端子との間の電位差が、感度設定部が設定した閾値電圧を超えたら、接続不良発生と判断することを特徴とする。
この構成によれば、接続不良発生を判定する閾値電圧は、電路接続部に流れる電流に比例係数が負の比例関係を持たせて設定されるため、電路電流が大きい状態で接続不良が発生しても、発熱温度が高温になる前に接続不良を検出でき、電路接続部に流れる電流の大きさに関わらず発熱温度が危険な温度になることがない。
また、電源から負荷に供給される電流が小さくても、調整電流を電路接続部に流すため、接続不良による電圧降下を電路電流のみによる場合より増大させることができ、接続不良を確実に検出できる。
In order to solve the above problem, the invention of claim 1 provides a connection failure detection device that detects connection failures in an electric circuit connection portion provided in an electric circuit to which an AC power source is connected in order to supply AC power to a load, the electric circuit connection portion having a power source side terminal to which the power source side electric circuit is connected and a load side terminal to which the load side electric circuit is connected, the device having: a sensitivity setting portion that varies a threshold voltage for determining whether a connection failure has occurred in accordance with the electric circuit current; a potential difference determination portion that monitors the potential difference between the power source side terminal and the load side terminal and compares it with the threshold voltage; an adjusted current generation portion that generates an adjusted current in phase with the AC power source and flows it between the power source side terminal and the load side terminal in addition to the current supplied from the AC power source; a total current measurement portion that measures the total current flowing between the power source side terminal and the load side terminal; and a notification portion that notifies the occurrence of a connection failure, the sensitivity setting portion generates a threshold voltage whose proportionality coefficient is negatively proportional to the measured current value of the total current measurement portion, and the potential difference determination portion determines that a connection failure has occurred when the potential difference between the power source side terminal and the load side terminal exceeds the threshold voltage set by the sensitivity setting portion.
According to this configuration, the threshold voltage for determining the occurrence of a connection failure is set so that the proportionality coefficient has a negative proportional relationship with the current flowing through the electrical circuit connection portion. Therefore, even if a connection failure occurs when the electrical circuit current is large, the connection failure can be detected before the heat generation temperature reaches a high temperature, and the heat generation temperature will not reach a dangerous temperature regardless of the magnitude of the current flowing through the electrical circuit connection portion.
Furthermore, even if the current supplied from the power supply to the load is small, a regulated current is passed through the circuit connection, so the voltage drop due to a poor connection can be increased more than when it is caused by the circuit current alone, and poor connection can be reliably detected.
請求項２の発明は、請求項１に記載の構成において、調整電流生成部は、調整電流生成部は、一定の大きさの電流を生成して電源側端子と負荷側端子の間に流すことを特徴とする。
この構成によれば、調整電流生成部が生成する電流値は一定であるため、簡易な回路で構成できる。
The invention of claim 2 is characterized in that, in the configuration described in claim 1, the adjustment current generation unit generates a current of a constant magnitude and flows it between the power supply side terminal and the load side terminal.
According to this configuration, the current value generated by the adjustment current generating section is constant, so that the adjustment current generating section can be configured with a simple circuit.
請求項３の発明は、請求項１に記載の構成において、調整電流生成部は、電源から負荷に供給される電路電流を計測する電路電流計測部と、電路接続部に通電させる電流の規定値を記憶する規定電流記憶部と、電流を生成して出力する電源部と、電源部の出力電流を制御する電流制御部と、を有し、電流制御部は、電路接続部に流れる電流が規定値になるよう電源部を制御することを特徴とする。
この構成によれば、電路接続部には例えば電路接続部の定格電流を常時流すことができる。よって、常時大電流を流すことで接続不良を確実に検出できる。
The invention of claim 3 is characterized in that, in the configuration described in claim 1, the adjustment current generation unit has a circuit current measurement unit that measures the circuit current supplied from the power source to the load, a specified current memory unit that stores a specified value of the current to be passed through the circuit connection unit, a power supply unit that generates and outputs current, and a current control unit that controls the output current of the power supply unit, and the current control unit controls the power supply unit so that the current flowing through the circuit connection unit becomes the specified value.
According to this configuration, for example, the rated current of the electric path connection portion can be constantly passed through the electric path connection portion, and therefore, by constantly passing a large current, connection defects can be reliably detected.
本発明によれば、接続不良発生を判定する閾値電圧は、電路接続部に流れる電流に比例係数が負の比例関係を持たせて設定されるため、電路電流が大きい状態で接続不良が発生しても、発熱温度が高温になる前に接続不良を検出でき、電路接続部に流れる電流の大きさに関わらず発熱温度が危険な温度になることがない。
また、電源から負荷に供給される電流が小さくても、調整電流を電路接続部に流すため、接続不良による電圧降下を電路電流のみによる場合より増大させることができ、接続不良を確実に検出できる。
According to the present invention, the threshold voltage for determining the occurrence of a connection failure is set so that the proportionality coefficient has a negative proportional relationship with the current flowing through the electrical circuit connection portion. Therefore, even if a connection failure occurs when the electrical circuit current is large, the connection failure can be detected before the heat generation temperature reaches a high temperature, and the heat generation temperature will not reach a dangerous temperature regardless of the magnitude of the current flowing through the electrical circuit connection portion.
Furthermore, even if the current supplied from the power supply to the load is small, a regulated current is passed through the circuit connection, so the voltage drop due to a poor connection can be increased more than when it is caused by the circuit current alone, and poor connection can be reliably detected.
以下、本発明を具体化した実施の形態を、図面を参照して詳細に説明する。図１は本発明に係る接続不良検出装置の一例を示す回路ブロック図であり、単相の電路に設けた構成を示している。電路Ｌは、交流１００Ｖ単相の商用電力から成る電源１０の電力を負荷１１に供給する２本の電線（第１電線Ｌ１、第２電線Ｌ２）から成る単相２線式の場合を示している。接続不良検出装置１は、この電路Ｌに取り付けられた電路接続部２に接続不良が発生したらそれを検出するよう構成されている。 Embodiments embodying the present invention will now be described in detail with reference to the drawings. Figure 1 is a circuit block diagram showing an example of a connection failure detection device according to the present invention, illustrating a configuration installed in a single-phase electrical circuit. Electrical circuit L is a single-phase, two-wire system consisting of two electrical wires (first electrical wire L1 and second electrical wire L2) that supply power from power source 10, which is single-phase 100V AC commercial power, to load 11. Connection failure detection device 1 is configured to detect any connection failure that occurs in electrical circuit connection portion 2 attached to this electrical circuit L.
電路接続部２は、電源側端子２ａと負荷側端子２ｂとを有し、電線Ｌ１，Ｌ２の２線からなる電路Ｌの双方に電路接続部２は設けられている。
電源側端子２ａ及び負荷側端子２ｂは、正常な状態では接触抵抗が無いか殆ど無い状態で連結されているが、接続不良が発生するとこの端子間の接触抵抗が増大して電路電流に比例する電圧降下が発生する。図１に示すｒはこの接触抵抗を示している。
The electrical path connecting portion 2 has a power supply side terminal 2a and a load side terminal 2b, and is provided on both of the electrical paths L consisting of two wires, the electric wires L1 and L2.
The power supply terminal 2a and the load terminal 2b are normally connected with little or no contact resistance, but if a connection failure occurs, the contact resistance between these terminals increases, causing a voltage drop proportional to the current in the circuit. The symbol r in Figure 1 represents this contact resistance.
また、Ｉは電路電流、Ｉ１は電路接続部２に流れる電流、Ｉ２は後述する電流生成部（調整電流生成部）３から送出される電流（調整電流）であり、これらの電流は次の関係を有している。
Ｉ１＝Ｉ＋Ｉ２
尚、Ｉ３は後述する第１変流器７が検出する電流を示し、それぞれの電流の矢印の方向は接続不良検出装置１が検出動作する際の電流の方向を示し、電源１０の一方の極性となる半波の中で動作する。
また図１では、説明の都合上２組有する電源側端子２ａと負荷側端子２ｂの組のうち、一方の組（第２電路Ｌ２の電路接続部２）のみに接続不良検出装置１を設けた場合を示しているが、実際には双方の組に接続不良検出装置は設置される。
Furthermore, I is the circuit current, I1 is the current flowing through the circuit connection portion 2, and I2 is the current (adjusted current) sent from the current generation portion (adjusted current generation portion) 3 described later, and these currents have the following relationship:
I1 = I + I2
Note that I3 indicates the current detected by the first current transformer 7 described later, and the direction of each current arrow indicates the direction of the current when the connection failure detection device 1 performs detection operation, and operates within a half-wave in which one polarity of the power supply 10 is present.
For convenience of explanation, FIG. 1 shows a case in which the connection failure detection device 1 is provided only in one of the two pairs of power supply side terminals 2 a and load side terminals 2 b (the electric circuit connection portion 2 of the second electric circuit L2), but in reality, connection failure detection devices are installed in both pairs.
接続不良検出装置１は、調整電流を生成する電流生成部３、接続不良発生を判定する閾値を設定する感度設定部４、接続不良発生を判定する電位差判定部５、判定結果を表示する通知部としての表示装置６を有している。
また、７、８は電流計測手段を構成する変流器であり、７は電路接続部２に流れる電流を計測する第１変流器、８は電路Ｌの電流を計測する第２変流器である。第１変流器は７、電路接続部２でなく電路電流Ｉを計測する部位に設置されているが、電流生成部３が生成する調整電流Ｉ２が通電される電線を巻回することで、実質電路接続部２に流れる電流Ｉ１を計測するよう構成されている。
The connection failure detection device 1 has a current generation unit 3 that generates an adjusted current, a sensitivity setting unit 4 that sets a threshold value for determining whether a connection failure has occurred, a potential difference determination unit 5 that determines whether a connection failure has occurred, and a display device 6 that serves as a notification unit that displays the determination result.
Further, 7 and 8 are current transformers constituting the current measuring means, with 7 being a first current transformer that measures the current flowing through the electric circuit connection part 2 and 8 being a second current transformer that measures the current of the electric circuit L. The first current transformer 7 is installed at a location where the electric circuit current I is measured, not at the electric circuit connection part 2, but is configured to measure the current I1 that actually flows through the electric circuit connection part 2 by winding an electric wire through which the regulated current I2 generated by the current generation part 3 flows.
電流生成部３は、電源１０に同期して電路接続部２に通電する電流である調整電流Ｉ２を生成する電源部３１、電路Ｌの電流を計測する電流計測部３２、所定の電流値（規定値）を記憶する記憶部３３、電源部３１が生成する電流を制御する電流制御部３４、電流生成部３を電路Ｌから絶縁する絶縁トランス３５等を備えている。
尚、電源部３１は、第２変流器８が計測した電路電流Ｉの位相情報を基に、同位相の一定の大きさの交流電流を生成する。
The current generating unit 3 includes a power supply unit 31 that generates an adjusted current I2, which is a current that flows through the electrical path connection unit 2 in synchronization with the power supply 10, a current measuring unit 32 that measures the current in the electrical path L, a memory unit 33 that stores a predetermined current value (specified value), a current control unit 34 that controls the current generated by the power supply unit 31, and an isolation transformer 35 that isolates the current generating unit 3 from the electrical path L.
The power supply unit 31 generates an AC current of a constant magnitude and in phase based on the phase information of the circuit current I measured by the second current transformer 8 .
調整電流Ｉ２は、絶縁トランス３５を介して生成され、電源側端子２ａと負荷側端子２ｂの間に供給される。また、この調整電流Ｉ２は第１変流器７にも供給される。
図２は、電路電流Ｉと調整電流Ｉ２の関係を示す波形図であり、（ａ）は電路電流Ｉ、（ｂ）は調整電流Ｉ２、（ｃ）は合成電流で電路接続部２に流れる電流Ｉ１を示している。
The regulated current I2 is generated via the isolation transformer 35 and supplied between the power supply side terminal 2a and the load side terminal 2b. The regulated current I2 is also supplied to the first current transformer 7.
FIG. 2 is a waveform diagram showing the relationship between the circuit current I and the regulating current I2, where (a) shows the circuit current I, (b) shows the regulating current I2, and (c) shows the combined current I1 flowing through the circuit connection portion 2.
電流計測部３２は、第２変流器８の計測値を基に電路電流Ｉを算出する。また、記憶部３３は、例えば電路接続部２に通電できる最大電流値である定格電流値を記憶している。 The current measurement unit 32 calculates the circuit current I based on the measurement value of the second current transformer 8. The memory unit 33 also stores, for example, the rated current value, which is the maximum current value that can be passed through the circuit connection unit 2.
電流制御部３４は、調整電流Ｉ２のオン／オフを制御する。具体的に、電流計測部３２が算出した電路電流情報を基に、電路接続部２に流れる電流Ｉ１が記憶部３３に設定された電流値になったら、調整電流Ｉ２を停止させる制御を実施する。
こうして調整電流Ｉ２を電路接続部２に通電することで、電路電流Ｉが小さくても電路接続部２の接触抵抗ｒによる電圧降下量を大きくでき、接続不良の検出をし易くしている。
The current control unit 34 controls the on/off of the adjustment current I2. Specifically, when the current I1 flowing through the electric path connection unit 2 reaches the current value set in the storage unit 33 based on the electric path current information calculated by the current measurement unit 32, the current control unit 34 performs control to stop the adjustment current I2.
By passing the adjusted current I2 through the electrical path connection portion 2 in this manner, the amount of voltage drop due to the contact resistance r of the electrical path connection portion 2 can be increased even if the electrical path current I is small, making it easier to detect poor connections.
感度設定部４は、接続不良発生を判断する閾値を設定する。具体的に、電路接続部２の電源側端子２ａの電圧情報が入力される基準端子４ａと、電路接続部２に流れる電流情報が入力される電流入力端子４ｂとから成る電流情報入力部４１、閾値電圧Ｖ２を出力する閾値出力端子４ｃを有し、閾値出力端子４ｃからは電路接続部２を流れる電流Ｉ１に比例係数が負の比例関係を有して変化する電圧情報を出力する。
図３は、感度設定部４が設定する閾値電圧Ｖ２と電路接続部２に流れる電流Ｉ１の関係を示している。図３に示すように、閾値出力端子４ｃから出力される閾値電圧Ｖ２は、電路接続部２に通電される電流Ｉ１に比例係数が負の比例関係を有する値で出力される。尚、４２は電源端子である。
The sensitivity setting unit 4 sets a threshold value for determining whether a connection failure has occurred. Specifically, the sensitivity setting unit 4 has a current information input unit 41, which is made up of a reference terminal 4a to which voltage information of the power supply side terminal 2a of the electric path connection unit 2 is input, and a current input terminal 4b to which information of a current flowing through the electric path connection unit 2 is input, and a threshold output terminal 4c that outputs a threshold voltage V2. The threshold output terminal 4c outputs voltage information that changes with a negative proportionality coefficient to the current I1 flowing through the electric path connection unit 2.
Fig. 3 shows the relationship between the threshold voltage V2 set by the sensitivity setting unit 4 and the current I1 flowing through the electrical path connecting unit 2. As shown in Fig. 3, the threshold voltage V2 output from the threshold output terminal 4c is output as a value having a negative proportionality coefficient with respect to the current I1 flowing through the electrical path connecting unit 2. Note that 42 is a power supply terminal.
電位差判定部５は、接続不良発生を判断する。具体的に、電路接続部２の負荷側端子２ｂの電圧情報が入力される電圧入力端子５ａ、閾値電圧Ｖ２が入力される閾値入力端子５ｂ、判定結果を出力する出力端子５ｃを有し、検出した電位差Ｖ１が入力された閾値電圧Ｖ２を超えたら出力端子５ｃから信号（接続不良発生信号）を出力する。尚、５１は電源端子である。 The potential difference determination unit 5 determines whether a connection failure has occurred. Specifically, it has a voltage input terminal 5a to which voltage information from the load terminal 2b of the electrical path connection unit 2 is input, a threshold input terminal 5b to which a threshold voltage V2 is input, and an output terminal 5c to which the determination result is output. If the detected potential difference V1 exceeds the input threshold voltage V2, a signal (connection failure occurrence signal) is output from the output terminal 5c. 51 is a power supply terminal.
表示装置６は、ＬＥＤ等を備えた発光表示部、警報音発生部を有し、電位差判定部５が接続不良発生信号を出力したら、ＬＥＤの発光、ブザーの報音等の接続不良発生の通知動作を実施する。 The display device 6 has a light-emitting display unit equipped with an LED or the like, and an alarm sound generator, and when the potential difference determination unit 5 outputs a connection failure signal, it notifies the user of the connection failure by illuminating the LED, sounding a buzzer, etc.
このように、接続不良発生を判定する閾値電圧は、電路接続部２に流れる電流に比例係数が負の比例関係を持たせて設定されるため、電路電流Ｉが大きい状態で接続不良が発生しても、発熱温度が高温になる前に接続不良を検出でき、電路接続部２に流れる電流の大きさに関わらず発熱温度が危険な温度になることがない。
また、電源１０から負荷に供給される電流が小さくても、調整電流Ｉ２を電路接続部２に流すため、接続不良による電圧降下を電路電流Ｉのみによる場合より増大させることができ、接続不良を確実に検出できる。
更に、電流生成部３が生成する電流値は一定であるため、簡易な回路で済む。
In this way, the threshold voltage for determining the occurrence of a connection failure is set so that the proportionality coefficient has a negative proportional relationship with the current flowing through the electrical circuit connection portion 2. Therefore, even if a connection failure occurs when the electrical circuit current I is large, the connection failure can be detected before the heat generation temperature reaches a high temperature, and the heat generation temperature will not reach a dangerous temperature regardless of the magnitude of the current flowing through the electrical circuit connection portion 2.
Furthermore, even if the current supplied from the power source 10 to the load is small, the regulated current I2 is passed through the circuit connection portion 2, so that the voltage drop due to a poor connection can be increased more than when it is caused only by the circuit current I, and the poor connection can be reliably detected.
Furthermore, since the current value generated by the current generating unit 3 is constant, a simple circuit is sufficient.
次に、接続不良検出装置１の他の形態を説明する。上記形態では電路接続部２に流す調整電流Ｉ２を一定値としているが、ここでは変動させている。
この場合、電流制御部３４が、電流計測部３２が算出した電路電流Ｉの情報を基に、電路電流Ｉの変化に関わらず、電路接続部２に流れる電流Ｉ１が記憶部３３に設定された電流となるよう電源部３１を制御して調整電流Ｉ２を変更制御する。この結果、電路接続部２には例えば電路接続部２の定格電流が常に通電される。
このように、電路接続部２に対して常に一定の大電流を通電することで、接触抵抗ｒが小さい状態でも、大きな電圧降下が発生するため、接続不良の確実な検出を可能としている。
Next, a description will be given of another embodiment of the connection failure detection device 1. In the above embodiment, the regulated current I2 flowing through the electrical path connection portion 2 is set to a constant value, but in this embodiment, it is made to fluctuate.
In this case, the current control unit 34 controls the power supply unit 31 to change and control the adjusted current I2 based on the information on the electric path current I calculated by the current measurement unit 32, so that the current I1 flowing through the electric path connection unit 2 becomes the current set in the memory unit 33, regardless of changes in the electric path current I. As a result, the rated current of the electric path connection unit 2, for example, is always applied to the electric path connection unit 2.
In this way, by constantly passing a large, constant current through the electrical path connection portion 2, a large voltage drop occurs even when the contact resistance r is small, making it possible to reliably detect poor connections.
尚、上記実施形態は、単相２線式電路Ｌの電路接続部２に関して説明したが、多相の電路に対しても上記接続不良検出装置は良好に適用できる。例えば、三相電路に適用した場合を図４に示している。図４において、２０は三相電源、電路ＬはＬ３～Ｌ５の三相で構成される電線（第３電線Ｌ３、第４電線Ｌ４、第５電線Ｌ５）を有し、接続不良検出装置１を第４電線Ｌ４線に設けた構成を示している。
そして、接続不良検出装置１の電源を検出対象の電線以外の２本の電線（第３電線Ｌ３，第５電線Ｌ５）から入手している。
このように構成することで、接続不良検出装置１を上記単相電路の場合のように良好に動作させることができる。また、三相４線式の場合は、接続不良を検出する電線以外の３本の電線から接続不良検出装置に電源を供給するよう構成すれば良い。
Although the above embodiment has been described with reference to the electric circuit connection portion 2 of a single-phase two-wire electric circuit L, the connection failure detection device can also be effectively applied to a multi-phase electric circuit. For example, Fig. 4 shows an example in which the connection failure detection device is applied to a three-phase electric circuit. In Fig. 4, reference numeral 20 denotes a three-phase power source, and the electric circuit L has electric wires consisting of three phases L3 to L5 (third electric wire L3, fourth electric wire L4, fifth electric wire L5), and the connection failure detection device 1 is provided on the fourth electric wire L4.
The power supply for the connection failure detection device 1 is obtained from two electric wires (the third electric wire L3 and the fifth electric wire L5) other than the electric wire to be detected.
This configuration allows the connection failure detection device 1 to operate as smoothly as in the case of the single-phase electric circuit. In the case of a three-phase four-wire system, power may be supplied to the connection failure detection device from three electric wires other than the electric wire for which the connection failure is to be detected.
１・・接続不良検出装置、２・・電路接続部、２ａ・・電源側端子、２ｂ・・負荷側端子、３・・電流生成部（調整電流生成部）、４・・感度設定部、５・・電位差判定部、６・・表示装置（通知部）、７・・第１変流器（全電流計測部）、８・・第２変流器（電路電流計測部）、１１・・負荷、３１・・電源部、３２・・電流計測部（電路電流計測部）、３３・・記憶部（規定電流記憶部）、Ｌ・・電路、Ｉ２・・調整電流。 1. Connection failure detection device, 2. Electrical circuit connection section, 2a. Power supply side terminal, 2b. Load side terminal, 3. Current generation section (adjusted current generation section), 4. Sensitivity setting section, 5. Potential difference determination section, 6. Display device (notification section), 7. First current transformer (total current measurement section), 8. Second current transformer (electrical circuit current measurement section), 11. Load, 31. Power supply section, 32. Current measurement section (electrical circuit current measurement section), 33. Memory section (specified current memory section), L. Electrical circuit, I2. Adjusted current.
Claims (3)
前記電路接続部は、電源側の電路が接続される電源側端子と、負荷側の電路が接続される負荷側端子とを有し、
接続不良発生を判断する閾値電圧を電路電流に応じて変動させる感度設定部と、
前記電源側端子と前記負荷側端子との間の電位差を監視して前記閾値電圧と比較判定する電位差判定部と、
前記交流電源と同位相の調整電流を生成して、前記電源側端子と前記負荷側端子の間に、前記交流電源から供給される電流に追加して流す調整電流生成部と、
前記電源側端子と前記負荷側端子との間に流れる全電流を計測する全電流計測部と、
接続不良発生を通知する通知部と、を有し、
前記感度設定部は、前記全電流計測部の計測電流値に比例係数が負の比例関係を有する前記閾値電圧を生成すると共に、
前記電位差判定部は、前記電源側端子と前記負荷側端子との間の電位差が、前記感度設定部が設定した前記閾値電圧を超えたら、接続不良発生と判断することを特徴とする接続不良検出装置。 A connection failure detection device for detecting a connection failure of an electric circuit connection portion provided in an electric circuit to which an AC power source is connected in order to supply AC power to a load,
the electrical path connection portion has a power supply side terminal to which an electrical path on a power supply side is connected and a load side terminal to which an electrical path on a load side is connected,
a sensitivity setting unit that varies a threshold voltage for determining whether a connection failure has occurred in accordance with a current in the electrical path;
a potential difference determination unit that monitors a potential difference between the power supply side terminal and the load side terminal and compares the potential difference with a threshold voltage;
an adjusting current generating unit that generates an adjusting current in phase with the AC power supply and flows the adjusting current between the power supply side terminal and the load side terminal in addition to the current supplied from the AC power supply;
a total current measurement unit that measures a total current flowing between the power supply side terminal and the load side terminal;
a notification unit that notifies the occurrence of a connection failure,
the sensitivity setting unit generates the threshold voltage having a proportionality coefficient that has a negative proportional relationship with the measured current value of the total current measurement unit;
A connection failure detection device characterized in that the potential difference determination unit determines that a connection failure has occurred when the potential difference between the power supply side terminal and the load side terminal exceeds the threshold voltage set by the sensitivity setting unit.
前記電流制御部は、前記電路接続部に流れる電流が前記規定値になるよう前記電源部を制御することを特徴とする請求項１記載の接続不良検出装置。 the adjusting current generating unit includes a circuit current measuring unit that measures a circuit current supplied from the power source to a load, a specified current storage unit that stores a specified value of a current to be passed through the circuit connecting unit, a power supply unit that generates and outputs a current, and a current control unit that controls the output current of the power supply unit;
2. The connection failure detection device according to claim 1, wherein the current control unit controls the power supply unit so that the current flowing through the electrical path connection unit becomes the specified value.
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| JP2000214208A (en) | 1999-01-22 | 2000-08-04 | Ricoh Co Ltd | Passive element, connection state detection method and connection state detection device |
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| US20160146889A1 (en) | 2013-06-21 | 2016-05-26 | Wago Verwaltungsgesellschaft Mbh | Monitoring circuit for detecting a switching state of an electrical switching contact and method therefor |
| JP2018026218A (en) | 2016-08-09 | 2018-02-15 | ボーンズ株式会社 | Electrical equipment |
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| JP2000214208A (en) | 1999-01-22 | 2000-08-04 | Ricoh Co Ltd | Passive element, connection state detection method and connection state detection device |
| US20160146889A1 (en) | 2013-06-21 | 2016-05-26 | Wago Verwaltungsgesellschaft Mbh | Monitoring circuit for detecting a switching state of an electrical switching contact and method therefor |
| WO2015025828A1 (en) | 2013-08-19 | 2015-02-26 | Yagi Hideo | Device for detecting indoor wiring connection defect, and connection defect determination method using same |
| JP2018026218A (en) | 2016-08-09 | 2018-02-15 | ボーンズ株式会社 | Electrical equipment |
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