TWI695558B - Cable breakage precursor detection device - Google Patents

Cable breakage precursor detection device Download PDF

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TWI695558B
TWI695558B TW108103635A TW108103635A TWI695558B TW I695558 B TWI695558 B TW I695558B TW 108103635 A TW108103635 A TW 108103635A TW 108103635 A TW108103635 A TW 108103635A TW I695558 B TWI695558 B TW I695558B
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current
cable
value
current path
path
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TW201937825A (en
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若林武志
山田隆章
津端創
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日商歐姆龍股份有限公司
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    • 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
    • G01R31/58—Testing of lines, cables or conductors
    • 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
    • G01R31/54—Testing for continuity

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Abstract

本發明之纜線斷線預兆偵測裝置偵測連接於作為負載之加熱器並對加熱器流通電流之纜線之斷線預兆。纜線包含並聯連接之多條電流路徑。纜線斷線預兆偵測裝置具備：電流檢測部，其檢測流經多條電流路徑中之至少一條電流路徑之電流；及警報部，其將電流檢測部之檢測值與閾值加以比較，檢測多條電流路徑之通電狀態，藉此判定多條電流路徑有無斷線，於判定為有斷線時，發出警報。The cable breakage precursor detection device of the present invention detects the breakage precursor of a cable connected to a heater as a load and flowing current to the heater. The cable contains multiple current paths connected in parallel. The cable breakage precursor detection device includes: a current detection part that detects the current flowing through at least one current path among the plurality of current paths; and an alarm part that compares the detection value of the current detection part with a threshold value The power-on state of each current path, to determine whether there is a disconnection of multiple current paths, and when it is determined that there is a disconnection, an alarm is issued.

Description

纜線斷線預兆偵測裝置Cable breakage precursor detection device

本發明係與偵測連接於負載並對負載流通電流之纜線之斷線相關的發明。The present invention is related to detecting the disconnection of a cable connected to a load and flowing current to the load.

一直以來，於將纜線連接於某個負載並經由該纜線對負載流通電流之電路之構成中，若纜線斷線則當然不會對負載進行電力供給。Conventionally, in a circuit configuration in which a cable is connected to a load and current flows to the load through the cable, if the cable is disconnected, of course, power is not supplied to the load.

例如，於加熱某個被加熱物之加熱裝置中，於作為熱源之加熱器與電源電路或控制電路之間連接有纜線。若此種纜線斷線，則無法進行加熱器之控制，從而無法進行特定之加熱。For example, in a heating device that heats a certain object to be heated, a cable is connected between a heater as a heat source and a power supply circuit or a control circuit. If such a cable breaks, the heater cannot be controlled, and specific heating cannot be performed.

因此，為了偵測纜線之斷線預兆，於專利文獻1中揭示有一種裝置，其於設置於可動部之纜線設置電壓供給用導線（實際所需之原本之導線）、及與該原本之導線相比耐彎曲性較差之虛設用導線，藉由檢測該虛設用導線有無斷線而預知原本之導線之斷線時期接近、或斷線之可能性較高。 [先前技術文獻] [專利文獻]Therefore, in order to detect the harbinger of the cable, Patent Document 1 discloses a device in which a wire for voltage supply (original wire that is actually needed) is provided on the cable provided in the movable part, and the original Compared with a dummy wire with poor bending resistance, by detecting whether the dummy wire is broken or not, it is predicted that the original wire breakage time is close to or broken. [Prior Technical Literature] [Patent Literature]

[專利文獻1]日本專利特開平5-340985號公報[Patent Document 1] Japanese Patent Laid-Open No. 5-340985

[發明所欲解決之課題][Problems to be solved by the invention]

於專利文獻1所揭示之裝置中，需要製作具備耐彎曲性較差之虛設用導線之特殊的纜線，無法使用具有通用性之纜線。又，由於為僅根據虛設用導線有無斷線而預知原本之導線之斷線之二值判定，故無法調整偵測纜線之斷線預兆之感度。又，亦無法偵測負載斷線等異常。In the device disclosed in Patent Document 1, a special cable with a dummy wire having poor bending resistance needs to be produced, and a versatile cable cannot be used. In addition, since the binary judgment for predicting the original wire breakage is based on whether the dummy wire is broken or not, it is impossible to adjust the sensitivity of the detection cable breakage sign. Also, abnormalities such as load disconnection cannot be detected.

因此，本發明之目的在於提供一種無需特殊之纜線而偵測纜線之斷線預兆之裝置。 [解決課題之技術手段]Therefore, the object of the present invention is to provide a device for detecting a broken sign of a cable without a special cable. [Technical means to solve the problem]

作為本揭示之一例之纜線斷線預兆偵測裝置係偵測連接於負載並對負載流通電流之纜線之斷線預兆的裝置，其具備電流檢測部與警報部。纜線包含並聯連接之多條電流路徑。電流檢測部檢測流經多條電流路徑中之至少一條電流路徑之電流。而且，警報部將電流檢測部之檢測值與閾值加以比較，檢測多條電流路徑之通電狀態，藉此判定多條電流路徑有無斷線，於判定為有斷線時，發出警報。As an example of the present disclosure, a cable breakage indication detection device is a device that detects a breakage indication of a cable connected to a load and flows current to the load, and includes a current detection section and an alarm section. The cable contains multiple current paths connected in parallel. The current detection unit detects a current flowing through at least one current path among the plurality of current paths. Furthermore, the alarm unit compares the detection value of the current detection unit with the threshold value, detects the energization state of the multiple current paths, thereby determining whether the multiple current paths are broken, and issues an alarm when it is determined that there is a break.

該構成中，無需耐彎曲性較差之虛設用導線等，可使用普通之纜線。又，並非虛設用導線有無斷線之二值判定，而是檢測流經多條電流路徑中之至少一條電流路徑之電流，並基於其與閾值之比較而檢測多條電流路徑之通電狀態，故亦可藉由閾值之設定而調整偵測纜線斷線預兆之感度。進而，亦可偵測負載斷線等異常。In this configuration, a dummy cable or the like with poor bending resistance is not necessary, and an ordinary cable can be used. Also, it is not a binary judgment of whether the dummy wire is broken or not, but it detects the current flowing through at least one current path among the multiple current paths and detects the energization status of the multiple current paths based on the comparison with the threshold. It is also possible to adjust the sensitivity of the detection cable breaking sign through the setting of the threshold. Furthermore, abnormalities such as load disconnection can also be detected.

又，於本揭示之一例中，纜線斷線預兆偵測裝置係偵測連接於負載並對負載流通電流之纜線之斷線預兆的裝置，其具備電流檢測部與警報部。纜線包含並聯連接之多條電流路徑。電流檢測部檢測流經多條電流路徑中之至少兩條電流路徑之電流之和或差。而且，警報部將電流檢測部之檢測值與閾值加以比較，檢測多條電流路徑之通電狀態，藉此判定多條電流路徑有無斷線，於判定為有斷線時，發出警報。Furthermore, in an example of the present disclosure, the cable breakage warning detection device is a device that detects a breakage warning of a cable connected to a load and flows current to the load, and includes a current detection section and an alarm section. The cable contains multiple current paths connected in parallel. The current detection unit detects the sum or difference of currents flowing through at least two current paths among the plurality of current paths. Furthermore, the alarm unit compares the detection value of the current detection unit with the threshold value, detects the energization state of the multiple current paths, thereby determining whether the multiple current paths are broken, and issues an alarm when it is determined that there is a break.

該構成中，基於流經多條電流路徑之電流之組合而檢測多條電流路徑之通電狀態，故可偵測多條電流路徑有無斷線之組合。In this configuration, the energization state of the multiple current paths is detected based on the combination of currents flowing through the multiple current paths, so it is possible to detect the combination of the multiple current paths for disconnection.

又，於本揭示之一例中，纜線斷線預兆偵測裝置係偵測分別連接於負載之多個連接部並對負載流通電流之多條纜線之斷線預兆的裝置，其具備電流檢測部與警報部。纜線包含連接於負載之第1連接部之第1纜線、及連接於負載之第2連接部之第2纜線。第1纜線係由並聯連接之多條第1電流路徑構成，第2纜線係由並聯連接之多條第2電流路徑構成。電流檢測部檢測流經多條第1電流路徑中之至少一條電流路徑之電流、與流經多條第2電流路徑中之至少一條電流路徑之電流的和或差。而且，警報部將電流檢測部之檢測值與閾值加以比較，檢測多條第1電流路徑之通電狀態及多條第2電流路徑之通電狀態，藉此判定多條第1電流路徑及多條第2電流路徑有無斷線，於判定為有斷線時，發出警報。In addition, in one example of the present disclosure, the cable breakage precursor detection device is a device that detects the breakage precursors of multiple cables that are respectively connected to a plurality of connection portions of a load and flows current to the load, and is provided with a current detection Department and Alarm Department. The cable includes a first cable connected to the first connection portion of the load, and a second cable connected to the second connection portion of the load. The first cable is composed of multiple first current paths connected in parallel, and the second cable is composed of multiple second current paths connected in parallel. The current detection unit detects the sum or difference between the current flowing through at least one current path among the plurality of first current paths and the current flowing through at least one current path among the plurality of second current paths. Furthermore, the alarm unit compares the detection value of the current detection unit with the threshold value, detects the energization state of the plurality of first current paths and the energization state of the plurality of second current paths, thereby determining the plurality of first current paths and the plurality of first current paths 2 If the current path is disconnected, an alarm is issued when it is judged to be disconnected.

該構成中，針對連接於負載之第1纜線與第2纜線，分別基於流經多條電流路徑之電流之組合而檢測多條電流路徑之通電狀態，故可偵測第1纜線之多條電流路徑及第2纜線之多條電流路徑有無斷線之組合。In this configuration, for the first cable and the second cable connected to the load, the energization status of the multiple current paths is detected based on the combination of the currents flowing through the multiple current paths, so the detection of the first cable There is a combination of multiple current paths and multiple current paths of the second cable with or without disconnection.

又，於本揭示之一例中，纜線斷線預兆偵測裝置係偵測分別連接於負載之多個連接部並對負載流通電流之多條纜線之斷線預兆的裝置，其具備電流檢測部與警報部。纜線包含連接於負載之第1連接部之第1纜線、及連接於負載之第2連接部之第2纜線。第1纜線係由並聯連接之多條第1電流路徑構成，第2纜線係由並聯連接之多條第2電流路徑構成。電流檢測部檢測流經第2電流路徑中之至少一條電流路徑之電流對流經第1電流路徑中之至少兩條電流路徑之電流之和或差的和或差。而且，警報部將電流檢測部之檢測值與閾值加以比較，檢測多條第1電流路徑之通電狀態及多條第2電流路徑之通電狀態，藉此判定多條第1電流路徑及多條第2電流路徑有無斷線，於判定為有斷線時，發出警報。In addition, in one example of the present disclosure, the cable breakage precursor detection device is a device that detects the breakage precursors of multiple cables that are respectively connected to a plurality of connection portions of a load and flows current to the load, and is provided with a current detection Department and Alarm Department. The cable includes a first cable connected to the first connection portion of the load, and a second cable connected to the second connection portion of the load. The first cable is composed of multiple first current paths connected in parallel, and the second cable is composed of multiple second current paths connected in parallel. The current detection unit detects the sum or difference of the sum or difference of currents flowing through at least one current path in the second current path and currents flowing through at least two current paths in the first current path. Furthermore, the alarm unit compares the detection value of the current detection unit with the threshold value, detects the energization state of the plurality of first current paths and the energization state of the plurality of second current paths, thereby determining the plurality of first current paths and the plurality of first current paths 2 If the current path is disconnected, an alarm is issued when it is judged to be disconnected.

該構成中，針對連接於負載之第1纜線與第2纜線，分別基於流經多條電流路徑之電流之組合而檢測多條電流路徑之通電狀態，故可偵測第1纜線之多條電流路徑及第2纜線之多條電流路徑有無斷線之組合。In this configuration, for the first cable and the second cable connected to the load, the energization status of the multiple current paths is detected based on the combination of the currents flowing through the multiple current paths, so the detection of the first cable There is a combination of multiple current paths and multiple current paths of the second cable with or without disconnection.

又，於本揭示之一例中，上述閾值係根據初始狀態下之電流檢測部之檢測值而規定。Furthermore, in an example of the present disclosure, the threshold value is defined based on the detection value of the current detection unit in the initial state.

該構成中，以自初始狀態之變化量進行斷線之偵測，從而能夠以更準確之判定進行斷線預兆偵測。 [發明之效果]In this configuration, the wire breakage detection is performed with the amount of change from the initial state, so that the wire breakage omen detection can be performed with a more accurate determination. [Effect of invention]

根據本發明，無需特殊之纜線便可偵測纜線之斷線預兆。According to the present invention, no special cable can be used to detect the cable breaking sign.

以下，參照若干個圖對用以實施本發明之形態進行說明。Hereinafter, a mode for implementing the present invention will be described with reference to several drawings.

∙應用例 首先，一面參照圖1一面對應用本發明之一例進行說明。圖1係表示包含本發明之實施形態之纜線斷線預兆偵測裝置之加熱裝置整體之構成的圖。∙Application examples First, an example of applying the present invention will be described with reference to FIG. 1. FIG. 1 is a diagram showing the overall configuration of a heating device including a cable breakage detection device according to an embodiment of the present invention.

如圖1所示，本實施形態之纜線斷線預兆偵測裝置201係偵測連接於作為負載之加熱器2並對該加熱器2流通電流之纜線31、32之斷線預兆的裝置。於圖1所示之例中，纜線31包含並聯連接之多條電流路徑CA11、CA12。纜線斷線預兆偵測裝置201具備：電流檢測部4，其檢測流經多條電流路徑CA11、CA12中之一條電流路徑CA12之電流；及警報部10，其將該電流檢測部4之檢測值與閾值加以比較，檢測多條電流路徑CA11、CA12之通電狀態，藉此判定多條電流路徑CA11、CA12有無斷線，於判定為有斷線時，輸出警報。As shown in FIG. 1, the cable breakage warning detection device 201 of this embodiment is a device that detects the breakage warning of cables 31 and 32 connected to a heater 2 as a load and flowing current to the heater 2 . In the example shown in FIG. 1, the cable 31 includes a plurality of current paths CA11 and CA12 connected in parallel. The cable breakage precursor detection device 201 includes: a current detection unit 4 that detects the current flowing through one of the plurality of current paths CA11 and CA12; and an alarm unit 10 that detects the current detection unit 4 The value is compared with the threshold value to detect the energization state of the multiple current paths CA11 and CA12, thereby determining whether the multiple current paths CA11 and CA12 are disconnected, and when it is determined that there is a disconnection, an alarm is output.

∙構成例 其次，參照圖對本發明之實施形態之加熱裝置之構成進行說明。如上所述，圖1係表示包含本發明之實施形態之纜線斷線預兆偵測裝置之加熱裝置整體之構成的圖。∙Configuration example Next, the configuration of the heating device according to the embodiment of the present invention will be described with reference to the drawings. As described above, FIG. 1 is a diagram showing the overall configuration of a heating device including a cable breakage detection device according to an embodiment of the present invention.

如圖1所示，加熱裝置101具備電源1、加熱器2、纜線31、32、電流檢測部4及開閉部5。加熱器2相當於本發明之「負載」。加熱器2經由纜線31、32而連接於電源1。纜線31、32係將電源1與加熱器2之間連接之電流路徑。於該例中，電源1係單相交流電源，加熱器2係2端子之負載。於纜線31中串聯***有開閉部5。又，纜線31包含兩條電流路徑CA11、CA12。電流檢測部4檢測流經電流路徑CA12之電流。該電流檢測部4例如為變流器（電流互感器），於二次側連接電阻器，輸出與檢測電流成比例之電壓。As shown in FIG. 1, the heating device 101 includes a power source 1, a heater 2, cables 31 and 32, a current detection unit 4 and an opening and closing unit 5. The heater 2 corresponds to the "load" of the present invention. The heater 2 is connected to the power source 1 via cables 31 and 32. The cables 31 and 32 are current paths connecting the power supply 1 and the heater 2. In this example, the power supply 1 is a single-phase AC power supply, and the heater 2 is a 2-terminal load. The opening and closing part 5 is inserted in series in the cable 31. In addition, the cable 31 includes two current paths CA11 and CA12. The current detection unit 4 detects the current flowing through the current path CA12. The current detection unit 4 is, for example, a current transformer (current transformer), a resistor is connected to the secondary side, and a voltage proportional to the detection current is output.

控制部20進行開閉部5之控制及與纜線之斷線預兆偵測相關之控制。The control unit 20 performs the control of the opening and closing unit 5 and the control related to the detection of the disconnection of the cable.

開閉部5例如為固態開關，根據輸出部16之輸出信號進行開閉。The opening and closing unit 5 is, for example, a solid state switch, and opens and closes based on the output signal of the output unit 16.

設定部12藉由自外部手動輸入或進行通訊而輸入設定值，並將該值記憶於記憶部13。電流測量部11根據電流檢測部4之檢測值而測量電流。判定部14根據記憶於記憶部13之值與由電流測量部11測量出之值而判定是否為異常狀態。於判定部14判定為異常狀態時，異常輸出部15藉由繼電器輸出或指示器之發光、通訊旗標之設定等而發出警報。The setting part 12 inputs a setting value by manually inputting or communicating from the outside, and stores the value in the memory part 13. The current measurement unit 11 measures the current based on the detection value of the current detection unit 4. The determination unit 14 determines whether it is an abnormal state based on the value stored in the storage unit 13 and the value measured by the current measurement unit 11. When the judging unit 14 judges that it is in an abnormal state, the abnormal output unit 15 issues an alarm by the relay output or the lighting of the indicator, the setting of the communication flag, and so on.

圖2係表示於特定部位斷線狀態下之流經第1電流路徑CA11之電流、流經第2電流路徑CA12之電流、及電流檢測部4之測量結果之關係的圖。圖2中，i11係流經第1電流路徑CA11之電流，i12係流經第2電流路徑CA12之電流，iCT係電流檢測部4之檢測值（電流測量部11之測量值）。任一者均係將流經加熱器2之電流設為1.0時之相對值。FIG. 2 is a diagram showing the relationship between the current flowing through the first current path CA11, the current flowing through the second current path CA12, and the measurement result of the current detection unit 4 in a disconnected state at a specific location. In FIG. 2, i11 is a current flowing through the first current path CA11, i12 is a current flowing through the second current path CA12, and iCT is a detection value of the current detection unit 4 (measurement value of the current measurement unit 11). In either case, the current flowing through the heater 2 is set to a relative value at 1.0.

於任一電流路徑均無斷線之情形時，測量電流值為0.5。於第1電流路徑CA11斷線時，流經加熱器2之電流僅流過第2電流路徑CA12，故流經第2電流路徑CA12之電流成為1.0。於第2電流路徑CA12斷線時，測量電流值成為0。於加熱器本身斷線時測量電流值亦成為0。When there is no disconnection in any current path, the measured current value is 0.5. When the first current path CA11 is disconnected, the current flowing through the heater 2 flows only through the second current path CA12, so the current flowing through the second current path CA12 becomes 1.0. When the second current path CA12 is disconnected, the measured current value becomes 0. The measured current value also becomes 0 when the heater itself is disconnected.

圖1所示之設定部12使記憶部13預先記憶上下限值、例如0.25與0.75。判定部14將該記憶部13之值作為閾值，並判定其與測量電流值之大小關係。圖3係表示閾值與測量電流值之關係之圖。若測量電流值為0.25以上且未達0.75之值，則視作正常。亦即，判定為電流路徑無斷線。若測量電流值為0.75以上，則視作第1電流路徑CA11斷線。又，若測量電流值未達0.25，則視作第2電流路徑CA12斷線。亦即，將此作為纜線31斷線之預兆而偵測。The setting unit 12 shown in FIG. 1 causes the memory unit 13 to memorize the upper and lower limit values, for example, 0.25 and 0.75. The determination unit 14 uses the value of the storage unit 13 as a threshold, and determines the magnitude relationship between it and the measured current value. Fig. 3 is a graph showing the relationship between the threshold value and the measured current value. If the measured current value is more than 0.25 and less than 0.75, it is regarded as normal. That is, it is determined that the current path is not broken. If the measured current value is 0.75 or more, the first current path CA11 is regarded as broken. In addition, if the measured current value does not reach 0.25, it is regarded that the second current path CA12 is disconnected. That is, this is detected as a sign that the cable 31 is broken.

再者，於加熱器2斷線時測量電流值亦未達0.25，故於本實施形態中，第2電流路徑CA12之斷線與加熱器2之斷線無法進行區別。Furthermore, the measured current value does not reach 0.25 when the heater 2 is disconnected, so in this embodiment, the disconnection of the second current path CA12 and the heater 2 cannot be distinguished.

圖4係表示圖1所示之控制部20之處理內容之流程圖。首先，重設電流值記憶旗標，判定輸出部之狀態（S1®S2）。若輸出部之狀態為接通，亦即開閉器為接通，則讀入測量電流值（S3）。然後，根據該值而決定並登記閾值，設定電流值記憶旗標（S4®S5®S6）。於圖3所示之例中，若初始之測量電流值為0.5，則將該值與相對變動量0.25進行加減後所得之值（0.75、0.25）作為閾值而進行登記。FIG. 4 is a flowchart showing the processing contents of the control unit 20 shown in FIG. 1. First, reset the current value memory flag to determine the state of the output section (S1®S2). If the state of the output part is on, that is, the switch is on, the measured current value is read (S3). Then, determine and register the threshold based on this value, and set the current value memory flag (S4®S5®S6). In the example shown in FIG. 3, if the initial measured current value is 0.5, the value (0.75, 0.25) obtained by adding and subtracting this value and the relative variation 0.25 is registered as the threshold.

於正常時，反覆執行S7®S2®S3®S4®S7之循環。其後，若測量電流值成為異常範圍之值，則進行異常輸出（S7®S8）。再者，若於其他例行程序中電流值記憶旗標被重設，則將該時間點之測量電流值作為初始電流值而進行更新。Under normal conditions, the S7®S2®S3®S4®S7 cycle is executed repeatedly. After that, if the measured current value becomes the value in the abnormal range, abnormal output is performed (S7®S8). Furthermore, if the current value memory flag is reset in other routines, the measured current value at that time point is updated as the initial current value.

其次，表示檢測流經兩條電流路徑之電流而偵測斷線預兆之例。Secondly, it shows an example of detecting a broken wire sign by detecting current flowing through two current paths.

圖5係與圖1所示之加熱裝置於電流檢測部4檢測之電流路徑之構成方面不同之加熱裝置的電路圖。該例中，電流檢測部4檢測流經兩條電流路徑CA11、CA12之電流之差量。FIG. 5 is a circuit diagram of a heating device that differs from the heating device shown in FIG. 1 in the configuration of the current path detected by the current detection unit 4. In this example, the current detection unit 4 detects the difference between the currents flowing through the two current paths CA11 and CA12.

圖6係表示於特定部位斷線狀態下之流經第1電流路徑CA11之電流、流經第2電流路徑CA12之電流、及電流檢測部4之測量結果之關係的圖。圖6中，i11係流經第1電流路徑CA11之電流，i12係流經第2電流路徑CA12之電流，iCT係電流檢測部4之檢測值。任一者均係將流經加熱器2之電流設為1.0時之相對值。6 is a diagram showing the relationship between the current flowing through the first current path CA11, the current flowing through the second current path CA12, and the measurement result of the current detection unit 4 in a disconnected state at a specific location. In FIG. 6, i11 is the current flowing through the first current path CA11, i12 is the current flowing through the second current path CA12, and iCT is the detection value of the current detection unit 4. In either case, the current flowing through the heater 2 is set to a relative value at 1.0.

於任一電流路徑均無斷線之情形時，流經第1電流路徑CA11、第2電流路徑CA12之電流為0.5，測量電流值為0。於第1電流路徑CA11斷線時，流經加熱器2之電流僅流過第2電流路徑CA12，故流經第2電流路徑CA12之電流成為1.0，測量電流值成為1.0。於第2電流路徑CA12斷線時，流經加熱器2之電流僅流過第1電流路徑CA11，故流經第1電流路徑CA11之電流成為1.0，測量電流值成為-1.0。於加熱器本身斷線時，測量電流值成為0。When there is no disconnection in any current path, the current flowing through the first current path CA11 and the second current path CA12 is 0.5, and the measured current value is 0. When the first current path CA11 is disconnected, the current flowing through the heater 2 flows only through the second current path CA12, so the current flowing through the second current path CA12 becomes 1.0 and the measured current value becomes 1.0. When the second current path CA12 is disconnected, the current flowing through the heater 2 flows only through the first current path CA11, so the current flowing through the first current path CA11 becomes 1.0 and the measured current value becomes -1.0. When the heater itself is disconnected, the measured current value becomes zero.

於圖5所示之例中，圖1所示之設定部12使記憶部13預先記憶例如0.5與-0.5作為上下限值。判定部14將該記憶部13之值作為閾值，並判定其與測量電流值之大小關係。然後，若測量電流值為-0.5以上且未達0.5之值，則視作正常。亦即，判定為電流路徑無斷線。若測量電流值為0.5以上，則視作第1電流路徑CA11斷線。又，若測量電流值未達-0.5，則視作第2電流路徑CA12斷線。亦即，將該等作為纜線31斷線之預兆而偵測。In the example shown in FIG. 5, the setting unit 12 shown in FIG. 1 causes the memory unit 13 to memorize, for example, 0.5 and -0.5 as upper and lower limits. The determination unit 14 uses the value of the storage unit 13 as a threshold, and determines the magnitude relationship between it and the measured current value. Then, if the measured current value is above -0.5 and less than 0.5, it is regarded as normal. That is, it is determined that the current path is not broken. If the measured current value is 0.5 or more, the first current path CA11 is regarded as broken. In addition, if the measured current value does not reach -0.5, it is regarded as a disconnection of the second current path CA12. That is, this is detected as a sign that the cable 31 is broken.

其次，表示偵測一條纜線由三條電流路徑構成之情形時之斷線預兆之例。Secondly, it shows an example of a broken sign when detecting a situation where a cable is composed of three current paths.

圖7係與圖1所示之加熱裝置於纜線31之構成方面不同之加熱裝置之電路圖。該例中，纜線31係由三條電流路徑CA11、CA12、CA13構成。電流檢測部4檢測流經電流路徑CA13之電流。7 is a circuit diagram of a heating device that differs from the heating device shown in FIG. 1 in the configuration of the cable 31. In this example, the cable 31 is composed of three current paths CA11, CA12, and CA13. The current detection unit 4 detects the current flowing through the current path CA13.

圖8係表示於特定部位斷線狀態下之流經第1電流路徑CA11之電流、流經第2電流路徑CA12之電流、流經第3電流路徑CA13之電流、及電流檢測部4之測量結果之關係的圖。於圖8中，i11係流經第1電流路徑CA11之電流，i12係流經第2電流路徑CA12之電流，i13係流經第3電流路徑CA13之電流，iCT係電流檢測部4之檢測值。任一者均係將流經加熱器2之電流設為1.0時之相對值。FIG. 8 shows the current flowing through the first current path CA11, the current flowing through the second current path CA12, the current flowing through the third current path CA13, and the measurement results of the current detection unit 4 in the disconnected state of the specific part Diagram of the relationship. In FIG. 8, i11 is the current flowing through the first current path CA11, i12 is the current flowing through the second current path CA12, i13 is the current flowing through the third current path CA13, and iCT is the detection value of the current detection unit 4 . In either case, the current flowing through the heater 2 is set to a relative value at 1.0.

於任一電流路徑均無斷線之情形時，流經第1電流路徑CA11、第2電流路徑CA12、第3電流路徑CA13之電流為1/3，測量電流值為1/3。於第1電流路徑CA11斷線時，流經加熱器2之電流流過第2電流路徑CA12與第3電流路徑CA13，故流經第3電流路徑CA13之電流成為0.5，測量電流值成為0.5。於第2電流路徑CA12斷線時，流經加熱器2之電流流過第1電流路徑CA11與第3電流路徑CA13，故流經第3電流路徑CA13之電流成為0.5，測量電流值成為0.5。於第3電流路徑CA13斷線時，流經第3電流路徑CA13之電流成為0，測量電流值成為0。於加熱器本身斷線時，測量電流值成為0。When there is no disconnection in any current path, the current flowing through the first current path CA11, the second current path CA12, and the third current path CA13 is 1/3, and the measured current value is 1/3. When the first current path CA11 is disconnected, the current flowing through the heater 2 flows through the second current path CA12 and the third current path CA13, so the current flowing through the third current path CA13 becomes 0.5 and the measured current value becomes 0.5. When the second current path CA12 is disconnected, the current flowing through the heater 2 flows through the first current path CA11 and the third current path CA13, so the current flowing through the third current path CA13 becomes 0.5 and the measured current value becomes 0.5. When the third current path CA13 is disconnected, the current flowing through the third current path CA13 becomes 0, and the measured current value becomes 0. When the heater itself is disconnected, the measured current value becomes zero.

於圖7所示之例中，圖1所示之設定部12使記憶部13預先記憶1/3與0之中間值即0.166作為下限值，並預先記憶0.5與1/3之中間值即0.416作為上限值。判定部14將該記憶部13之值作為閾值，並判定其與測量電流值之大小關係。然後，若測量電流值為0.166以上且未達0.416之值，則視作正常。亦即，判定為電流路徑無斷線。若測量電流值為0.416以上，則視作第1電流路徑CA11或第2電流路徑CA12斷線。又，若測量電流值未達0.166，則視作第3電流路徑CA13斷線。亦即，將該等作為纜線31斷線之預兆而偵測。In the example shown in FIG. 7, the setting section 12 shown in FIG. 1 causes the memory section 13 to pre-store the intermediate value of 1/3 and 0, that is, 0.166 as the lower limit value, and pre-store the intermediate value of 0.5 and 1/3, that is 0.416 as the upper limit. The determination unit 14 uses the value of the storage unit 13 as a threshold, and determines the magnitude relationship between it and the measured current value. Then, if the measured current value is above 0.166 and less than 0.416, it is regarded as normal. That is, it is determined that the current path is not broken. If the measured current value is 0.416 or more, it is regarded that the first current path CA11 or the second current path CA12 is disconnected. If the measured current value does not reach 0.166, the third current path CA13 is regarded as broken. That is, this is detected as a sign that the cable 31 is broken.

再者，於加熱器2斷線時測量電流值亦成為0，故於本實施形態中，第3電流路徑CA13之斷線與加熱器2之斷線無法進行區別。Furthermore, when the heater 2 is disconnected, the measured current value also becomes 0. Therefore, in this embodiment, the disconnection of the third current path CA13 and the heater 2 cannot be distinguished.

圖9係與圖7所示之例於電流檢測部之構成方面不同之加熱裝置之電路圖。該例中，纜線31係由三條電流路徑CA11、CA12、CA13構成。電流檢測部4檢測流經電流路徑CA12之電流與流經電流路徑CA13之電流之相加值。FIG. 9 is a circuit diagram of a heating device that differs from the example shown in FIG. 7 in the configuration of the current detection unit. In this example, the cable 31 is composed of three current paths CA11, CA12, and CA13. The current detection unit 4 detects the added value of the current flowing through the current path CA12 and the current flowing through the current path CA13.

圖10係表示於特定部位斷線狀態下之流經第1電流路徑CA11之電流、流經第2電流路徑CA12之電流、流經第3電流路徑CA13之電流、及電流檢測部4之測量結果之關係的圖。於圖10中，i11係流經第1電流路徑CA11之電流，i12係流經第2電流路徑CA12之電流，i13係流經第3電流路徑CA13之電流，iCT係電流檢測部4之檢測值。任一者均係將流經加熱器2之電流設為1.0時之相對值。FIG. 10 shows the current flowing through the first current path CA11, the current flowing through the second current path CA12, the current flowing through the third current path CA13, and the measurement results of the current detection unit 4 in the disconnected state of the specific part Diagram of the relationship. In FIG. 10, i11 is the current flowing through the first current path CA11, i12 is the current flowing through the second current path CA12, i13 is the current flowing through the third current path CA13, and iCT is the detection value of the current detection unit 4 . In either case, the current flowing through the heater 2 is set to a relative value at 1.0.

於任一電流路徑均無斷線之情形時，流經第1電流路徑CA11、第2電流路徑CA12、第3電流路徑CA13之電流為1/3，測量電流值為2/3。於第1電流路徑CA11斷線時，流經加熱器2之電流流過第2電流路徑CA12與第3電流路徑CA13，故測量電流值成為1.0。於第2電流路徑CA12斷線時，流經加熱器2之電流流過第1電流路徑CA11與第3電流路徑CA13，故測量電流值成為0.5。於第3電流路徑CA13斷線時，流經加熱器2之電流流過第1電流路徑CA11與第2電流路徑CA12，故測量電流值成為0.5。於加熱器本身斷線時，測量電流值成為0。When there is no disconnection in any current path, the current flowing through the first current path CA11, the second current path CA12, and the third current path CA13 is 1/3, and the measured current value is 2/3. When the first current path CA11 is disconnected, the current flowing through the heater 2 flows through the second current path CA12 and the third current path CA13, so the measured current value becomes 1.0. When the second current path CA12 is disconnected, the current flowing through the heater 2 flows through the first current path CA11 and the third current path CA13, so the measured current value becomes 0.5. When the third current path CA13 is disconnected, the current flowing through the heater 2 flows through the first current path CA11 and the second current path CA12, so the measured current value becomes 0.5. When the heater itself is disconnected, the measured current value becomes zero.

於圖9所示之例中，圖1所示之設定部12使記憶部13預先記憶2/3與0.5之中間值即0.583作為下限值，並預先記憶1.0與2/3之中間值即0.833作為上限值。判定部14將該記憶部13之值作為閾值，並判定其與測量電流值之大小關係。然後，若測量電流值為0.583以上且未達0.833之值，則視作正常。亦即，判定為電流路徑無斷線。若測量電流值為0.833以上，則視作第1電流路徑CA11斷線。又，若測量電流值未達0.583，則視作第2電流路徑CA12或第3電流路徑CA13斷線。亦即，將該等作為纜線31斷線之預兆而偵測。In the example shown in FIG. 9, the setting section 12 shown in FIG. 1 causes the memory section 13 to pre-store the intermediate value of 2/3 and 0.5, or 0.583, as the lower limit value, and pre-store the intermediate value of 1.0 and 2/3, namely 0.833 as the upper limit. The determination unit 14 uses the value of the storage unit 13 as a threshold, and determines the magnitude relationship between it and the measured current value. Then, if the measured current value is above 0.583 and less than 0.833, it is regarded as normal. That is, it is determined that the current path is not broken. If the measured current value is 0.833 or more, the first current path CA11 is regarded as broken. In addition, if the measured current value does not reach 0.583, it is regarded that the second current path CA12 or the third current path CA13 is broken. That is, this is detected as a sign that the cable 31 is broken.

圖11係電流檢測部4檢測流經構成纜線31之三條電流路徑CA11、CA12、CA13之電流之加熱裝置之電路圖。於該例中，纜線31係由三條電流路徑CA11、CA12、CA13構成。電流檢測部4檢測自流經電流路徑CA12之電流與流經電流路徑CA13之電流之相加值減去流經電流路徑CA11之電流所得的值。11 is a circuit diagram of a heating device in which the current detection unit 4 detects the current flowing through the three current paths CA11, CA12, and CA13 constituting the cable 31. In this example, the cable 31 is composed of three current paths CA11, CA12, and CA13. The current detection unit 4 detects a value obtained by subtracting the current flowing through the current path CA11 from the added value of the current flowing through the current path CA12 and the current flowing through the current path CA13.

圖12係表示於特定部位斷線狀態下之流經第1電流路徑CA11電流、流經第2電流路徑CA12之電流、流經第3電流路徑CA13之電流、及電流檢測部4之測量結果之關係的圖。於圖12中，i11係流經第1電流路徑CA11之電流，i12係流經第2電流路徑CA12之電流，i13係流經第3電流路徑CA13之電流，iCT係電流檢測部4之檢測值。任一者均係將流經加熱器2之電流設為1.0時之相對值。12 is a graph showing the current flowing through the first current path CA11, the current flowing through the second current path CA12, the current flowing through the third current path CA13, and the measurement results of the current detection unit 4 in the disconnected state of the specific part Diagram of relationship. In FIG. 12, i11 is the current flowing through the first current path CA11, i12 is the current flowing through the second current path CA12, i13 is the current flowing through the third current path CA13, and iCT is the detection value of the current detection unit 4 . In either case, the current flowing through the heater 2 is set to a relative value at 1.0.

於任一電流路徑均無斷線之情形時，流經第1電流路徑CA11、第2電流路徑CA12、第3電流路徑CA13之電流為1/3，測量電流值為1/3。於第1電流路徑CA11斷線時，流經加熱器2之電流流過第2電流路徑CA12與第3電流路徑CA13，故測量電流值成為1.0。於第2電流路徑CA12斷線時，流經加熱器2之電流流過第1電流路徑CA11與第3電流路徑CA13，故測量電流值成為0。於第3電流路徑CA13斷線時，流經加熱器2之電流流過第1電流路徑CA11與第2電流路徑CA12，故測量電流值成為0。於加熱器本身斷線時，測量電流值成為0。When there is no disconnection in any current path, the current flowing through the first current path CA11, the second current path CA12, and the third current path CA13 is 1/3, and the measured current value is 1/3. When the first current path CA11 is disconnected, the current flowing through the heater 2 flows through the second current path CA12 and the third current path CA13, so the measured current value becomes 1.0. When the second current path CA12 is disconnected, the current flowing through the heater 2 flows through the first current path CA11 and the third current path CA13, so the measured current value becomes zero. When the third current path CA13 is disconnected, the current flowing through the heater 2 flows through the first current path CA11 and the second current path CA12, so the measured current value becomes zero. When the heater itself is disconnected, the measured current value becomes zero.

於圖11所示之例中，圖1所示之設定部12使記憶部13預先記憶1/3與0之中間值即0.166作為下限值，並預先記憶1.0與1/3之中間值即0.666作為上限值。判定部14將該記憶部13之值作為閾值，並判定其與測量電流值之大小關係。然後，若測量電流值為0.166以上且未達0.666之值，則視作正常。亦即，判定為電流路徑無斷線。若測量電流值為0.666以上，則視作第1電流路徑CA11斷線。又，若測量電流值未達0.166，則視作第2電流路徑CA12或第3電流路徑CA13斷線。亦即，將該等作為纜線31斷線之預兆而偵測。In the example shown in FIG. 11, the setting unit 12 shown in FIG. 1 causes the memory unit 13 to pre-store the intermediate value of 1/3 and 0, that is, 0.166 as the lower limit value, and pre-store the intermediate value of 1.0 and 1/3, that is 0.666 is taken as the upper limit. The determination unit 14 uses the value of the storage unit 13 as a threshold, and determines the magnitude relationship between it and the measured current value. Then, if the measured current value is above 0.166 and less than 0.666, it is regarded as normal. That is, it is determined that the current path is not broken. If the measured current value is 0.666 or more, the first current path CA11 is regarded as broken. In addition, if the measured current value does not reach 0.166, it is regarded that the second current path CA12 or the third current path CA13 is broken. That is, this is detected as a sign that the cable 31 is broken.

圖13係與圖1所示之例不同之加熱裝置之電路圖。於該例中，電流檢測部4檢測流經構成第1纜線31之兩條電流路徑CA11、CA12中之電流路徑CA12之電流、與流經構成第2纜線之電流路徑CA2之電流的差。Fig. 13 is a circuit diagram of a heating device different from the example shown in Fig. 1. In this example, the current detection unit 4 detects the difference between the current flowing through the current path CA12 of the two current paths CA11 and CA12 constituting the first cable 31 and the current flowing through the current path CA2 constituting the second cable .

圖14係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA2之電流、及電流檢測部4之測量結果之關係的圖。圖14中，i11係流經電流路徑CA11之電流，i12係流經電流路徑CA12之電流，i2係流經電流路徑CA2之電流，iCT係電流檢測部4之檢測值。任一者均係將流經加熱器2之電流設為1.0時之相對值。FIG. 14 is a diagram showing the relationship between the current flowing through the current paths CA11, CA12, and CA2 and the measurement result of the current detection unit 4 in a disconnected state at a specific location. In FIG. 14, i11 is the current flowing through the current path CA11, i12 is the current flowing through the current path CA12, i2 is the current flowing through the current path CA2, and iCT is the detection value of the current detection unit 4. In either case, the current flowing through the heater 2 is set to a relative value at 1.0.

於任一電流路徑均無斷線之情形時，流經電流路徑CA11、CA12之電流為0.5，流經電流路徑CA2之電流為1.0，故測量電流值為-0.5。於電流路徑CA11斷線時，流經加熱器2之電流流過電流路徑CA12與電流路徑CA2，故測量電流值成為0。於電流路徑CA12斷線時，流經加熱器2之電流流過電流路徑CA11與電流路徑CA2，故測量電流值成為-1.0。於電流路徑CA2斷線時，測量電流值成為0。於加熱器本身斷線時，測量電流值亦成為0。When there is no disconnection in any current path, the current flowing through the current paths CA11 and CA12 is 0.5, and the current flowing through the current path CA2 is 1.0, so the measured current value is -0.5. When the current path CA11 is disconnected, the current flowing through the heater 2 flows through the current path CA12 and the current path CA2, so the measured current value becomes zero. When the current path CA12 is disconnected, the current flowing through the heater 2 flows through the current path CA11 and the current path CA2, so the measured current value becomes -1.0. When the current path CA2 is disconnected, the measured current value becomes 0. When the heater itself is disconnected, the measured current value also becomes zero.

於圖13所示之例中，圖1所示之設定部12使記憶部13預先記憶-0.5與0之中間值即-0.25作為上限值。又，預先記憶-0.5與-1.0之中間值即-0.75作為下限值。判定部14將該記憶部13之值作為閾值，並判定其與測量電流值之大小關係。然後，若測量電流值為-0.75以上且未達-0.25之值，則視作正常。亦即，判定為電流路徑無斷線。若測量電流值為-0.25以上，則視作電流路徑CA11、CA2之任一者斷線。又，若測量電流值未達-0.75，則視作電流路徑CA12斷線。將該等作為纜線31斷線之預兆而偵測。In the example shown in FIG. 13, the setting unit 12 shown in FIG. 1 causes the memory unit 13 to memorize the intermediate value of -0.5 and 0, that is, -0.25 as the upper limit value in advance. In addition, the intermediate value of -0.5 and -1.0, that is, -0.75, is memorized in advance as the lower limit value. The determination unit 14 uses the value of the storage unit 13 as a threshold, and determines the magnitude relationship between it and the measured current value. Then, if the measured current value is above -0.75 and less than -0.25, it is regarded as normal. That is, it is determined that the current path is not broken. If the measured current value is -0.25 or more, it is considered that either of the current paths CA11 and CA2 is broken. In addition, if the measured current value does not reach -0.75, it is regarded as a disconnection of the current path CA12. These are detected as a sign that the cable 31 is broken.

圖15係與圖1所示之例不同之加熱裝置之電路圖。於該例中，電流檢測部4檢測流經構成第1纜線31之兩條電流路徑CA11、CA12中之電流路徑CA12之電流、與流經構成第2纜線之電流路徑CA2之電流的和。Fig. 15 is a circuit diagram of a heating device different from the example shown in Fig. 1. In this example, the current detection unit 4 detects the sum of the current flowing through the current path CA12 of the two current paths CA11 and CA12 constituting the first cable 31 and the current flowing through the current path CA2 constituting the second cable .

圖16係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA2之電流、及電流檢測部4之測量結果之關係的圖。圖16中，i11係流經電流路徑CA11之電流，i12係流經電流路徑CA12之電流，i2係流經電流路徑CA2之電流，iCT係電流檢測部4之檢測值。任一者均係將流經加熱器2之電流設為1.0時之相對值。FIG. 16 is a diagram showing the relationship between the current flowing through the current paths CA11, CA12, and CA2 and the measurement result of the current detection unit 4 in a disconnected state at a specific location. In FIG. 16, i11 is the current flowing through the current path CA11, i12 is the current flowing through the current path CA12, i2 is the current flowing through the current path CA2, and iCT is the detection value of the current detection unit 4. In either case, the current flowing through the heater 2 is set to a relative value at 1.0.

於任一電流路徑均無斷線之情形時，流經電流路徑CA11、CA12之電流均為0.5，流經電流路徑CA2之電流為1.0，故測量電流值為1.5。於電流路徑CA11斷線時，流經加熱器2之電流流過電流路徑CA12與電流路徑CA2，故測量電流值成為2.0。於電流路徑CA12斷線時，流經加熱器2之電流流過電流路徑CA11與電流路徑CA2，故測量電流值成為1.0。於電流路徑CA2斷線時，測量電流值成為0。於加熱器本身斷線時，測量電流值亦成為0。When there is no disconnection in any current path, the current flowing through the current paths CA11 and CA12 is 0.5, and the current flowing through the current path CA2 is 1.0, so the measured current value is 1.5. When the current path CA11 is disconnected, the current flowing through the heater 2 flows through the current path CA12 and the current path CA2, so the measured current value becomes 2.0. When the current path CA12 is disconnected, the current flowing through the heater 2 flows through the current path CA11 and the current path CA2, so the measured current value becomes 1.0. When the current path CA2 is disconnected, the measured current value becomes 0. When the heater itself is disconnected, the measured current value also becomes zero.

於圖15所示之例中，圖1所示之設定部12使記憶部13預先記憶1.5與1之中間值即1.25作為下限值，並預先記憶2.0與1.5之中間值即1.75作為上限值。判定部14將該記憶部13之值作為閾值，並判定其與測量電流值之大小關係。然後，若測量電流值為1.25以上且未達1.75，則視作正常。亦即，判定為電流路徑無斷線。若測量電流值為1.75以上，則視作電流路徑CA11斷線。又，若測量電流值未達1.25，則視作電流路徑CA12或電流路徑CA2斷線。亦即，將該等作為纜線31斷線之預兆而偵測。In the example shown in FIG. 15, the setting section 12 shown in FIG. 1 causes the memory section 13 to pre-store the intermediate value of 1.5 and 1, which is 1.25, as the lower limit value, and pre-store the intermediate value of 2.0 and 1.5, or 1.75, as the upper limit. value. The determination unit 14 uses the value of the storage unit 13 as a threshold, and determines the magnitude relationship between it and the measured current value. Then, if the measured current value is above 1.25 and does not reach 1.75, it is regarded as normal. That is, it is determined that the current path is not broken. If the measured current value is 1.75 or more, the current path CA11 is regarded as broken. In addition, if the measured current value does not reach 1.25, it is regarded as that the current path CA12 or the current path CA2 is broken. That is, this is detected as a sign that the cable 31 is broken.

圖17係與圖1所示之例不同之加熱裝置之電路圖。於該例中，電流檢測部4檢測流經構成第1纜線31之兩條電流路徑CA11、CA12中之電流路徑CA12之電流、與流經構成第2纜線32之兩條電流路徑CA21、CA22中之電流路徑CA22之電流的和。Fig. 17 is a circuit diagram of a heating device different from the example shown in Fig. 1. In this example, the current detection unit 4 detects the current flowing through the current path CA12 of the two current paths CA11 and CA12 that constitute the first cable 31 and the two current paths CA21 that form the second cable 32, The sum of the currents in CA22 in CA22.

圖18係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA21、CA22之電流、及電流檢測部4之測量結果之關係的圖。圖18中，i11係流經電流路徑CA11之電流，i12係流經電流路徑CA12之電流，i21係流經電流路徑CA21之電流，i22係流經電流路徑CA22之電流，iCT係電流檢測部4之檢測值。任一者均係將流經加熱器2之電流設為1.0時之相對值。FIG. 18 is a diagram showing the relationship between the current flowing through the current paths CA11, CA12, CA21, and CA22 and the measurement result of the current detection unit 4 in a disconnected state at a specific location. In FIG. 18, i11 is the current flowing through the current path CA11, i12 is the current flowing through the current path CA12, i21 is the current flowing through the current path CA21, i22 is the current flowing through the current path CA22, and iCT is the current detection unit 4 Of the detection value. In either case, the current flowing through the heater 2 is set to a relative value at 1.0.

於任一電流路徑均無斷線之情形時，流經電流路徑CA11、CA12、CA21、CA22之電流均為0.5，故測量電流值為1.0。於電流路徑CA11斷線時，流經加熱器2之電流流過電流路徑CA12，故測量電流值成為1.5。於電流路徑CA12斷線時，流經加熱器2之電流流過電流路徑CA11，故測量電流值成為0.5。於電流路徑CA21斷線時，流過加熱器2之電流流過電流路徑CA22，故測量電流值成為1.5。於電流路徑CA22斷線時，測量電流值成為0.5。於加熱器本身斷線時，測量電流值成為0。When there is no disconnection in any current path, the current flowing through the current paths CA11, CA12, CA21, CA22 is 0.5, so the measured current value is 1.0. When the current path CA11 is disconnected, the current flowing through the heater 2 flows through the current path CA12, so the measured current value becomes 1.5. When the current path CA12 is disconnected, the current flowing through the heater 2 flows through the current path CA11, so the measured current value becomes 0.5. When the current path CA21 is disconnected, the current flowing through the heater 2 flows through the current path CA22, so the measured current value becomes 1.5. When the current path CA22 is disconnected, the measured current value becomes 0.5. When the heater itself is disconnected, the measured current value becomes zero.

於圖17所示之例中，圖1所示之設定部12使記憶部13預先記憶1.0與0.5之中間值即0.75作為下限值，並預先記憶1.0與1.5之中間值即1.25作為上限值。判定部14將該記憶部13之值作為閾值，並判定其與測量電流值之大小關係。然後，若測量電流值為0.75以上且未達1.25之值，則視作正常。亦即，判定為電流路徑無斷線。若測量電流值未達0.75，則視作電流路徑CA12、CA22之任一者斷線。又，若測量電流值為1.25以上，則視作電流路徑CA11、CA21之任一者斷線。亦即，將該等作為纜線31斷線之預兆而偵測。In the example shown in FIG. 17, the setting unit 12 shown in FIG. 1 causes the memory unit 13 to memorize the intermediate value of 1.0 and 0.5, namely 0.75, as the lower limit value, and memorize the intermediate value of 1.0 and 1.5, or 1.25, as the upper limit. value. The determination unit 14 uses the value of the storage unit 13 as a threshold, and determines the magnitude relationship between it and the measured current value. Then, if the measured current value is above 0.75 and less than 1.25, it is regarded as normal. That is, it is determined that the current path is not broken. If the measured current value does not reach 0.75, it is considered that any of the current paths CA12 and CA22 is broken. In addition, if the measured current value is 1.25 or more, any one of the current paths CA11 and CA21 is regarded as broken. That is, this is detected as a sign that the cable 31 is broken.

圖19係與圖1所示之例不同之加熱裝置之電路圖。於該例中，電流檢測部4檢測流經構成第1纜線31之兩條電流路徑CA11、CA12中之電流路徑CA12之電流、與流經構成第2纜線32之兩條電流路徑CA21、CA22中之電流路徑CA22之電流的差。Fig. 19 is a circuit diagram of a heating device different from the example shown in Fig. 1. In this example, the current detection unit 4 detects the current flowing through the current path CA12 of the two current paths CA11 and CA12 that constitute the first cable 31 and the two current paths CA21 that form the second cable 32, The current difference in the current path CA22 in CA22.

圖20係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA21、CA22之電流、及電流檢測部4之測量結果之關係的圖。於圖20中，i11係流經電流路徑CA11之電流，i12係流經電流路徑CA12之電流，i21係流經電流路徑CA21之電流，i22係流經電流路徑CA22之電流，iCT係電流檢測部4之檢測值。任一者均係將流經加熱器2之電流設為1.0時之相對值。FIG. 20 is a diagram showing the relationship between the current flowing through the current paths CA11, CA12, CA21, CA22 and the measurement result of the current detection unit 4 in the disconnected state of a specific part. In FIG. 20, i11 is the current flowing through the current path CA11, i12 is the current flowing through the current path CA12, i21 is the current flowing through the current path CA21, i22 is the current flowing through the current path CA22, and iCT is the current detection unit The detection value of 4. In either case, the current flowing through the heater 2 is set to a relative value at 1.0.

於任一電流路徑均無斷線之情形時，流經電流路徑CA11、CA12、CA21、CA22之電流均為0.5，故測量電流值為0。於電流路徑CA11斷線時，流經加熱器2之電流流過電流路徑CA12，故測量電流值成為0.5。於電流路徑CA12斷線時，流經加熱器2之電流流過電流路徑CA11，故測量電流值成為-0.5。於電流路徑CA21斷線時，流過加熱器2之電流流過電流路徑CA22，故測量電流值成為-0.5。於電流路徑CA22斷線時，測量電流值成為0.5。於加熱器本身斷線時，測量電流值成為0。When there is no disconnection in any current path, the current flowing through the current paths CA11, CA12, CA21, CA22 is 0.5, so the measured current value is 0. When the current path CA11 is disconnected, the current flowing through the heater 2 flows through the current path CA12, so the measured current value becomes 0.5. When the current path CA12 is disconnected, the current flowing through the heater 2 flows through the current path CA11, so the measured current value becomes -0.5. When the current path CA21 is disconnected, the current flowing through the heater 2 flows through the current path CA22, so the measured current value becomes -0.5. When the current path CA22 is disconnected, the measured current value becomes 0.5. When the heater itself is disconnected, the measured current value becomes zero.

於圖19所示之例中，圖1所示之設定部12使記憶部13預先記憶0與-0.5之中間值即-0.25作為下限值，並預先記憶0與0.5之中間值即0.25作為上限值。判定部14將該記憶部13之值作為閾值，並判定其與測量電流值之大小關係。然後，若測量電流值為-0.25以上且未達0.25之值，則視作正常。亦即，判定為電流路徑無斷線。若測量電流值未達-0.25，則視作電流路徑CA12、CA21之任一者斷線。又，若測量電流值為0.25以上，則視作電流路徑CA11、CA22之任一者斷線。亦即，將該等作為纜線31斷線之預兆而偵測。In the example shown in FIG. 19, the setting section 12 shown in FIG. 1 causes the memory section 13 to pre-store the intermediate value of 0 and -0.5, that is, -0.25 as the lower limit value, and pre-store the intermediate value of 0 and 0.5, which is 0.25 as Upper limit. The determination unit 14 uses the value of the storage unit 13 as a threshold, and determines the magnitude relationship between it and the measured current value. Then, if the measured current value is above -0.25 and less than 0.25, it is regarded as normal. That is, it is determined that the current path is not broken. If the measured current value does not reach -0.25, it is considered that either of the current paths CA12 and CA21 is broken. In addition, if the measured current value is 0.25 or more, any one of the current paths CA11 and CA22 is regarded as broken. That is, this is detected as a sign that the cable 31 is broken.

圖21係與圖1所示之例不同之加熱裝置之電路圖。於該例中，電流檢測部4檢測流經構成第1纜線31之兩條電流路徑CA11、CA12之電流之差、與流經構成第2纜線32之兩條電流路徑CA21、CA22中之電流路徑CA22之電流的差。Fig. 21 is a circuit diagram of a heating device different from the example shown in Fig. 1. In this example, the current detection unit 4 detects the difference between the currents flowing through the two current paths CA11 and CA12 constituting the first cable 31 and the two current paths CA21 and CA22 constituting the second cable 32 The difference in current in the current path CA22.

圖22係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA21、CA22之電流、及電流檢測部4之測量結果之關係的圖。於圖22中，i11係流經電流路徑CA11之電流，i12係流經電流路徑CA12之電流，i21係流經電流路徑CA21之電流，i22係流經電流路徑CA22之電流，iCT係電流檢測部4之檢測值。任一者均係將流經加熱器2之電流設為1.0時之相對值。FIG. 22 is a diagram showing the relationship between the current flowing through the current paths CA11, CA12, CA21, and CA22 in a disconnected state at a specific location, and the measurement result of the current detection unit 4. In FIG. 22, i11 is the current flowing through the current path CA11, i12 is the current flowing through the current path CA12, i21 is the current flowing through the current path CA21, i22 is the current flowing through the current path CA22, and iCT is the current detection unit The detection value of 4. In either case, the current flowing through the heater 2 is set to a relative value at 1.0.

於任一電流路徑均無斷線之情形時，流經電流路徑CA11、CA12、CA21、CA22之電流均為0.5，故測量電流值為0.5。於電流路徑CA11斷線時，流經加熱器2之電流流過電流路徑CA12，故測量電流值成為1.5。於電流路徑CA12斷線時，流經加熱器2之電流流過電流路徑CA11，故測量電流值成為-0.5。於電流路徑CA21斷線時，流過加熱器2之電流流過電流路徑CA22，故測量電流值成為1.0。於電流路徑CA22斷線時，測量電流值成為0。於加熱器本身斷線時，測量電流值成為0。When there is no disconnection in any current path, the current flowing through the current paths CA11, CA12, CA21, CA22 is 0.5, so the measured current value is 0.5. When the current path CA11 is disconnected, the current flowing through the heater 2 flows through the current path CA12, so the measured current value becomes 1.5. When the current path CA12 is disconnected, the current flowing through the heater 2 flows through the current path CA11, so the measured current value becomes -0.5. When the current path CA21 is disconnected, the current flowing through the heater 2 flows through the current path CA22, so the measured current value becomes 1.0. When the current path CA22 is disconnected, the measured current value becomes 0. When the heater itself is disconnected, the measured current value becomes zero.

於圖21所示之例中，圖1所示之設定部12使記憶部13預先記憶0與0.5之中間值即0.25作為下限值，並預先記憶0.5與1.0之中間值即0.75作為上限值。判定部14將該記憶部13之值作為閾值，並判定其與測量電流值之大小關係。然後，若測量電流值為0.25以上且未達0.75之值，則視作正常。亦即，判定為電流路徑無斷線。若測量電流值未達0.25，則視作電流路徑CA12、CA22之任一者斷線。又，若測量電流值為0.75以上，則視作電流路徑CA11、CA21之任一者斷線。亦即，將該等作為纜線31斷線之預兆而偵測。In the example shown in FIG. 21, the setting unit 12 shown in FIG. 1 causes the memory unit 13 to memorize the intermediate value of 0 and 0.5, namely 0.25, as the lower limit value, and memorize the intermediate value of 0.5 and 1.0, or 0.75, as the upper limit. value. The determination unit 14 uses the value of the storage unit 13 as a threshold, and determines the magnitude relationship between it and the measured current value. Then, if the measured current value is more than 0.25 and less than 0.75, it is regarded as normal. That is, it is determined that the current path is not broken. If the measured current value does not reach 0.25, it is considered that any of the current paths CA12 and CA22 is broken. In addition, if the measured current value is 0.75 or more, any one of the current paths CA11 and CA21 is regarded as broken. That is, this is detected as a sign that the cable 31 is broken.

圖23係與圖1所示之例不同之加熱裝置之電路圖。該例中，不僅於圖1所示之第1纜線31側，而且於第2纜線32側亦設置電流檢測部，根據該兩個電流檢測部之檢測結果而偵測纜線之斷線預兆。於該加熱裝置中，可藉由與圖1所示之例相同之原理而檢測第2纜線32之電流路徑CA21、CA22有無斷線，藉此對於第2纜線32之斷線亦可偵測預兆。Fig. 23 is a circuit diagram of a heating device different from the example shown in Fig. 1. In this example, not only the first cable 31 side shown in FIG. 1 but also the second cable 32 side is also provided with a current detection section, which detects a broken cable based on the detection results of the two current detection sections omen. In this heating device, whether the current paths CA21 and CA22 of the second cable 32 are disconnected can be detected by the same principle as the example shown in FIG. 1, whereby the disconnection of the second cable 32 can also be detected Omens.

亦可以相同之方式，將圖5、圖7、圖9、圖11、圖13、圖15、圖17、圖19、圖21等所示之電流檢測部之構成設置於第2纜線32側，根據該兩個電流檢測部之檢測結果偵測纜線之斷線預兆。In the same manner, the structure of the current detection unit shown in FIGS. 5, 7, 9, 9, 11, 13, 15, 17, 19, 21, etc. can be provided on the side of the second cable 32 , Based on the detection results of the two current detection parts, to detect the broken sign of the cable.

以上所示之例係表示將兩條纜線連接於具有兩個端子之負載之裝置，但對於將纜線連接於具有三個以上端子之負載之裝置亦可同樣地應用。例如，圖24係將三相交流電源經由纜線而連接於作為三相交流負載之加熱器2之裝置之例。該例中，於三相交流電源之各線分別經由兩條電流路徑而連接有加熱器2。而且，於各相之兩條電流路徑之一者分別連接有電流檢測部CT1、CT2、CT3。The example shown above shows a device that connects two cables to a load with two terminals, but the same applies to devices that connect cables to a load with more than three terminals. For example, FIG. 24 is an example in which a three-phase AC power supply is connected to a heater 2 as a three-phase AC load via a cable. In this example, the heater 2 is connected to each line of the three-phase AC power supply through two current paths. Furthermore, one of the two current paths of each phase is connected to the current detection units CT1, CT2, and CT3, respectively.

圖25係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA21、CA22、CA31、CA32之電流、及電流檢測部CT1、CT2、CT3之檢測結果之關係的圖。圖24中，i11係流經電流路徑CA11之電流，i12係流經電流路徑CA12之電流，i21係流經電流路徑CA21之電流，i22係流經電流路徑CA22之電流，i31係流經電流路徑CA31之電流，i32係流經電流路徑CA32之電流，iCT1係電流檢測部CT1之檢測值，iCT2係電流檢測部CT2之檢測值，iCT3係電流檢測部CT3之檢測值。任一者均係將流經加熱器2之相電流設為1.0時之相對值。FIG. 25 is a diagram showing the relationship between the currents flowing through the current paths CA11, CA12, CA21, CA22, CA31, CA32 and the detection results of the current detection units CT1, CT2, and CT3 in the disconnected state of a specific part. In FIG. 24, i11 is the current flowing through the current path CA11, i12 is the current flowing through the current path CA12, i21 is the current flowing through the current path CA21, i22 is the current flowing through the current path CA22, and i31 is the current flowing through the current path The current of CA31, i32 is the current flowing through the current path CA32, iCT1 is the detection value of the current detection section CT1, iCT2 is the detection value of the current detection section CT2, and iCT3 is the detection value of the current detection section CT3. In either case, the relative value when the phase current flowing through the heater 2 is set to 1.0.

與圖1、圖2所示之例同樣地，預先將與電流檢測部CT1之檢測值加以比較之下限之閾值規定為0.25，將上限之閾值規定為0.75。關於電流檢測部CT2、CT3亦相同。以此方式，可根據三個電流檢測部CT1、CT2、CT3之檢測結果而偵測纜線31、32、33之斷線預兆。As in the example shown in FIGS. 1 and 2, the threshold value of the lower limit compared with the detection value of the current detection unit CT1 is defined as 0.25, and the threshold value of the upper limit is defined as 0.75. The same applies to the current detection units CT2 and CT3. In this way, according to the detection results of the three current detection sections CT1, CT2, and CT3, the disconnection signs of the cables 31, 32, and 33 can be detected.

最後，上述用以實施發明之形態之說明無須重新敍述，於所有方面均為例示，並非限制性者。業者可適當地進行變形及變更。Finally, the above description of the form for carrying out the invention does not need to be restated, and it is an example in all respects, not a limitation. The operator can appropriately transform and change.

例如，於使纜線分支為多條電流路徑之部分設置纜線鉚接部，但於該纜線鉚接部之接觸電阻並不均等之情形時，對多條電流路徑之分流比並不成為等分比。於該情形時，根據對多條電流路徑之實際之分流比而規定閾值即可。For example, when a cable riveting portion is provided at a portion where the cable is branched into multiple current paths, but when the contact resistance of the cable riveting portion is not equal, the split ratio for the multiple current paths does not become equal ratio. In this case, it is sufficient to specify the threshold according to the actual shunting ratio to the multiple current paths.

又，圖4中，表示根據所測量之初始電流值而決定閾值之例，但有因負載、纜線、纜線之連接部等之經年變化而導致正常時之電流值產生變化之情形，因此，亦可構成為於特定之時序根據所測量之電流值而重新設定閾值。In addition, FIG. 4 shows an example in which the threshold value is determined based on the measured initial current value, but there are cases where the normal current value changes due to the year-to-year change of the load, cable, cable connection, etc., Therefore, it may be configured to reset the threshold according to the measured current value at a specific timing.

又，以上所示之實施形態中，例示將加熱器作為負載之加熱裝置，但對於將馬達或電磁鐵作為負載之裝置等亦可同樣地應用。Furthermore, in the above-described embodiment, a heating device using a heater as a load is exemplified, but it can be similarly applied to a device using a motor or an electromagnet as a load.

又，以上所示之各實施形態中，將變流器（電流互感器）用作電流檢測部，但除此之外，例如亦可將電流檢測用電阻元件***各電流路徑中，根據其降低電壓而檢測流經該電流路徑之電流。於該情形時，設置求出電流之峰值之整流電路、判定正弦波之極性之極性判定部、及考慮對多條電流路徑求出之峰值之極性而進行加減運算之運算部即可。In addition, in each of the above-described embodiments, a current transformer (current transformer) is used as the current detection unit. However, in addition, for example, a resistance element for current detection may be inserted into each current path and reduced according to the Voltage to detect the current flowing through the current path. In this case, it is sufficient to provide a rectifier circuit for determining the peak value of the current, a polarity determination section for determining the polarity of the sine wave, and an arithmetic section for performing addition and subtraction operations in consideration of the polarities of the peak values determined for multiple current paths.

CA11‧‧‧第1電流路徑 CA12‧‧‧第2電流路徑 CA13‧‧‧第3電流路徑 CA2‧‧‧電流路徑 CA21、CA22‧‧‧電流路徑 CA31、CA32‧‧‧電流路徑 CT1、CT2、CT3‧‧‧電流檢測部 1‧‧‧電源 2‧‧‧加熱器 4‧‧‧電流檢測部 5‧‧‧開閉部 10‧‧‧警報部 11‧‧‧電流測量部 12‧‧‧設定部 13‧‧‧記憶部 14‧‧‧判定部 15‧‧‧異常輸出部 16‧‧‧輸出部 20‧‧‧控制部 31‧‧‧第1纜線 32‧‧‧第2纜線 33‧‧‧纜線 101‧‧‧加熱裝置 201‧‧‧纜線斷線預兆偵測裝置CA11‧‧‧First current path CA12‧‧‧ 2nd current path CA13‧‧‧3rd current path CA2‧‧‧current path CA21, CA22 ‧‧‧ current path CA31, CA32‧‧‧ Current path CT1, CT2, CT3 ‧‧‧ Current Detection Department 1‧‧‧Power 2‧‧‧heater 4‧‧‧Current Detection Department 5‧‧‧Opening and Closing Department 10‧‧‧Alarm Department 11‧‧‧Current Measurement Department 12‧‧‧Setting Department 13‧‧‧ Memory Department 14‧‧‧Judgment Department 15‧‧‧ Abnormal output section 16‧‧‧Output 20‧‧‧Control Department 31‧‧‧ First cable 32‧‧‧ 2nd cable 33‧‧‧Cable 101‧‧‧Heating device 201‧‧‧Cable disconnection warning device

圖1係表示包含本發明之實施形態之纜線斷線預兆偵測裝置之加熱裝置整體之構成的圖。 圖2係表示於特定部位斷線狀態下之流經第1電流路徑CA11之電流、流經第2電流路徑CA12之電流、及電流檢測部4之測量結果之關係的圖。 圖3係表示閾值與測量電流值之關係之圖。 圖4係表示圖1所示之控制部20之處理內容之流程圖。 圖5係與圖1所示之加熱裝置於電流檢測部4檢測之電流路徑之構成方面不同之加熱裝置的電路圖。 圖6係表示於特定部位斷線狀態下之流經第1電流路徑CA11之電流、流經第2電流路徑CA12之電流、及電流檢測部4之測量結果之關係的圖。 圖7係與圖1所示之加熱裝置於纜線31之構成方面不同之加熱裝置之電路圖。 圖8係表示於特定部位斷線狀態下之流經第1電流路徑CA11之電流、流經第2電流路徑CA12之電流、流經第3電流路徑CA13之電流、及電流檢測部4之測量結果之關係的圖。 圖9係與圖7所示之例於電流檢測部之構成方面不同之加熱裝置之電路圖。 圖10係表示於特定部位斷線狀態下之流經第1電流路徑CA11之電流、流經第2電流路徑CA12之電流、流經第3電流路徑CA13之電流、及電流檢測部4之測量結果之關係的圖。 圖11係電流檢測部4檢測流經構成纜線31之三條電流路徑CA11、CA12、CA13之電流之加熱裝置的電路圖。 圖12係表示於特定部位斷線狀態下之流經第1電流路徑CA11之電流、流經第2電流路徑CA12之電流、流經第3電流路徑CA13之電流、及電流檢測部4之測量結果之關係的圖。 圖13係與圖1所示之例不同之加熱裝置之電路圖。 圖14係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA2之電流、及電流檢測部4之測量結果之關係的圖。 圖15係與圖1所示之例不同之加熱裝置之電路圖。 圖16係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA2之電流、及電流檢測部4之測量結果之關係的圖。 圖17係與圖1所示之例不同之加熱裝置之電路圖。 圖18係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA21、CA22之電流、及電流檢測部4之測量結果之關係的圖。 圖19係與圖1所示之例不同之加熱裝置之電路圖。 圖20係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA21、CA22之電流、及電流檢測部4之測量結果之關係的圖。 圖21係與圖1所示之例不同之加熱裝置之電路圖。 圖22係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA21、CA22之電流、及電流檢測部4之測量結果之關係的圖。 圖23係與圖1所示之例不同之加熱裝置之電路圖。 圖24係將三相交流電源經由纜線連接於作為三相交流負載之加熱器2之裝置之例。 圖25係表示於特定部位斷線狀態下之流經電流路徑CA11、CA12、CA21、CA22、CA31、CA32之電流、及電流檢測部CT1、CT2、CT3之檢測結果之關係的圖。FIG. 1 is a diagram showing the overall configuration of a heating device including a cable breakage detection device according to an embodiment of the present invention. FIG. 2 is a diagram showing the relationship between the current flowing through the first current path CA11, the current flowing through the second current path CA12, and the measurement result of the current detection unit 4 in a disconnected state at a specific location. Fig. 3 is a graph showing the relationship between the threshold value and the measured current value. FIG. 4 is a flowchart showing the processing contents of the control unit 20 shown in FIG. 1. FIG. 5 is a circuit diagram of a heating device that differs from the heating device shown in FIG. 1 in the configuration of the current path detected by the current detection unit 4. 6 is a diagram showing the relationship between the current flowing through the first current path CA11, the current flowing through the second current path CA12, and the measurement result of the current detection unit 4 in a disconnected state at a specific location. 7 is a circuit diagram of a heating device that differs from the heating device shown in FIG. 1 in the configuration of the cable 31. FIG. 8 shows the current flowing through the first current path CA11, the current flowing through the second current path CA12, the current flowing through the third current path CA13, and the measurement results of the current detection unit 4 in the disconnected state of the specific part Diagram of the relationship. FIG. 9 is a circuit diagram of a heating device that differs from the example shown in FIG. 7 in the configuration of the current detection unit. FIG. 10 shows the current flowing through the first current path CA11, the current flowing through the second current path CA12, the current flowing through the third current path CA13, and the measurement results of the current detection unit 4 in the disconnected state of the specific part Diagram of the relationship. FIG. 11 is a circuit diagram of a heating device in which the current detection unit 4 detects the current flowing through the three current paths CA11, CA12, and CA13 constituting the cable 31. FIG. 12 shows the current flowing through the first current path CA11, the current flowing through the second current path CA12, the current flowing through the third current path CA13, and the measurement results of the current detection unit 4 in the disconnected state of the specific part Diagram of the relationship. Fig. 13 is a circuit diagram of a heating device different from the example shown in Fig. 1. FIG. 14 is a diagram showing the relationship between the current flowing through the current paths CA11, CA12, and CA2 and the measurement result of the current detection unit 4 in a disconnected state at a specific location. Fig. 15 is a circuit diagram of a heating device different from the example shown in Fig. 1. FIG. 16 is a diagram showing the relationship between the current flowing through the current paths CA11, CA12, and CA2 and the measurement result of the current detection unit 4 in a disconnected state at a specific location. Fig. 17 is a circuit diagram of a heating device different from the example shown in Fig. 1. FIG. 18 is a diagram showing the relationship between the current flowing through the current paths CA11, CA12, CA21, and CA22 and the measurement result of the current detection unit 4 in a disconnected state at a specific location. Fig. 19 is a circuit diagram of a heating device different from the example shown in Fig. 1. FIG. 20 is a diagram showing the relationship between the current flowing through the current paths CA11, CA12, CA21, CA22 and the measurement result of the current detection unit 4 in the disconnected state of a specific part. Fig. 21 is a circuit diagram of a heating device different from the example shown in Fig. 1. FIG. 22 is a diagram showing the relationship between the current flowing through the current paths CA11, CA12, CA21, and CA22 in a disconnected state at a specific location, and the measurement result of the current detection unit 4. Fig. 23 is a circuit diagram of a heating device different from the example shown in Fig. 1. Fig. 24 is an example of a device in which a three-phase AC power supply is connected to a heater 2 as a three-phase AC load via a cable. FIG. 25 is a diagram showing the relationship between the currents flowing through the current paths CA11, CA12, CA21, CA22, CA31, CA32 and the detection results of the current detection units CT1, CT2, and CT3 in the disconnected state of a specific part.

CA11‧‧‧第1電流路徑 CA11‧‧‧First current path

CA12‧‧‧第2電流路徑 CA12‧‧‧ 2nd current path

1‧‧‧電源 1‧‧‧Power

2‧‧‧加熱器 2‧‧‧heater

4‧‧‧電流檢測部 4‧‧‧Current Detection Department

5‧‧‧開閉部 5‧‧‧Opening and Closing Department

10‧‧‧警報部 10‧‧‧Alarm Department

11‧‧‧電流測量部 11‧‧‧Current Measurement Department

12‧‧‧設定部 12‧‧‧Setting Department

13‧‧‧記憶部 13‧‧‧ Memory Department

14‧‧‧判定部 14‧‧‧Judgment Department

15‧‧‧異常輸出部 15‧‧‧ Abnormal output section

16‧‧‧輸出部 16‧‧‧Output

20‧‧‧控制部 20‧‧‧Control Department

31‧‧‧第1纜線 31‧‧‧ First cable

32‧‧‧第2纜線 32‧‧‧ 2nd cable

101‧‧‧加熱裝置 101‧‧‧Heating device

201‧‧‧纜線斷線預兆偵測裝置 201‧‧‧Cable disconnection warning device

Claims (3)

一種纜線斷線預兆偵測裝置，其係偵測分別連接於負載之多個連接部並對上述負載流通電流之多條纜線之斷線預兆的裝置，上述纜線包含連接於上述負載之多個連接部中之第1連接部之第1纜線、及連接於上述負載之多個連接部中之第2連接部之第2纜線，上述第1纜線係由並聯連接之多條第1電流路徑構成，上述第2纜線係由並聯連接之多條第2電流路徑構成，且該纜線斷線預兆偵測裝置具備：電流檢測部，其檢測流經上述多條第1電流路徑中之至少一條電流路徑之電流、與流經上述多條第2電流路徑中之至少一條電流路徑之電流的和或差；及警報部，其將上述電流檢測部之檢測值與閾值加以比較，檢測上述多條第1電流路徑之通電狀態及上述多條第2電流路徑之通電狀態，藉此判定上述多條第1電流路徑及上述多條第2電流路徑有無斷線，於判定為有斷線時，發出警報。 A cable breakage precursor detection device, which is a device for detecting breakage precursors of a plurality of cables respectively connected to a plurality of connection parts of a load and passing current to the load, the cable includes a connection to the load The first cable of the first connection part of the plurality of connection parts, and the second cable of the second connection part of the plurality of connection parts connected to the load, the first cable is composed of a plurality of parallel connections The first current path is constituted, and the second cable is composed of a plurality of second current paths connected in parallel, and the cable breakage precursor detection device includes: a current detection section that detects the flow of the plurality of first currents The sum or difference between the current of at least one current path in the path and the current flowing through at least one current path of the plurality of second current paths; and an alarm section that compares the detection value of the current detection section with a threshold To detect the power-on state of the first current paths and the power-on state of the second current paths, to determine whether the first current paths and the second current paths are disconnected. When disconnected, an alarm will sound. 一種纜線斷線預兆偵測裝置，其係偵測分別連接於負載之多個連接部並對上述負載流通電流之多條纜線之斷線預兆的裝置，上述纜線包含連接於上述負載之多個連接部中之第1連接部之第1纜線、及連接於上述負載之多個連接部中之第2連接部之第2纜線，上述第1纜線係由並聯連接之多條第1電流路徑構成，上述第2纜線係由並聯連接之多條第2電流路徑構成，且該纜線斷線預兆偵測裝置具備：電流檢測部，其檢測流經上述多條第2電流路徑中之至少一條電流路徑之電流對流經上述多條第1電流路徑中之至少兩條電流路徑之電流之和或差的和 或差；及警報部，其將上述電流檢測部之檢測值與閾值加以比較，檢測上述多條第1電流路徑之通電狀態及上述多條第2電流路徑之通電狀態，藉此判定上述多條第1電流路徑及上述多條第2電流路徑有無斷線，於判定為有斷線時，發出警報。 A cable breakage precursor detection device, which is a device for detecting breakage precursors of a plurality of cables respectively connected to a plurality of connection parts of a load and passing current to the load, the cable includes a connection to the load The first cable of the first connection part of the plurality of connection parts, and the second cable of the second connection part of the plurality of connection parts connected to the load, the first cable is composed of a plurality of parallel connections The first current path is constituted, and the second cable is composed of a plurality of second current paths connected in parallel, and the cable breakage precursor detection device includes: a current detection unit that detects the flow of the second currents The sum or difference of the currents of at least one current path in the path to the currents flowing through at least two current paths in the first current paths Or difference; and an alarm part, which compares the detection value of the current detection part with a threshold value, detects the energization state of the plurality of first current paths and the energization state of the plurality of second current paths, thereby determining the plurality of Whether the first current path and the plurality of second current paths are disconnected, an alarm is issued when it is determined that there is a disconnection. 如請求項1或2所述之纜線斷線預兆偵測裝置，其中上述閾值係根據初始狀態下之上述電流檢測部之檢測值而規定。 The cable breakage precursor detection device according to claim 1 or 2, wherein the threshold value is specified based on the detection value of the current detection unit in an initial state.
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