WO2019167472A1 - ケーブル断線予兆検知装置 - Google Patents

ケーブル断線予兆検知装置 Download PDF

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Publication number
WO2019167472A1
WO2019167472A1 PCT/JP2019/001740 JP2019001740W WO2019167472A1 WO 2019167472 A1 WO2019167472 A1 WO 2019167472A1 JP 2019001740 W JP2019001740 W JP 2019001740W WO 2019167472 A1 WO2019167472 A1 WO 2019167472A1
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Prior art keywords
current
cable
value
disconnection
current path
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PCT/JP2019/001740
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English (en)
French (fr)
Japanese (ja)
Inventor
武志 若林
山田　隆章
創 津端
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オムロン株式会社
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Publication of WO2019167472A1 publication Critical patent/WO2019167472A1/ja

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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

Definitions

  • the present invention relates to detection of disconnection of a cable that is connected to a load and supplies current to the load.
  • a cable is connected between a heater that is a heat source and a power supply circuit or a control circuit.
  • the heater cannot be controlled and the predetermined heating cannot be performed.
  • the cable installed in the movable part is connected to a voltage supply lead wire (the actual lead wire that is actually required) and more resistant to this original lead wire.
  • a voltage supply lead wire the actual lead wire that is actually required
  • Japanese Patent Application Laid-Open No. H10-228707 discloses an apparatus that performs this.
  • an object of the present invention is to provide an apparatus for detecting a sign of cable disconnection without requiring a special cable.
  • the cable disconnection sign detection device as an example of the present disclosure is a device that detects a sign of a disconnection of a cable that is connected to a load and supplies current to the load, and includes a current detection unit and an alarm unit.
  • the cable includes a plurality of current paths connected in parallel.
  • the current detection unit detects a current flowing through at least one of the plurality of current paths.
  • the alarm unit compares the detection value by the current detection unit with the threshold value, detects the energized state of the plurality of current paths, determines whether or not the plurality of current paths are disconnected, and determines that there is a disconnection , Issue an alarm.
  • This configuration does not require dummy lead wires or the like that are inferior in bending resistance, and can use ordinary cables. Also, instead of binary determination of whether or not the dummy lead wire is disconnected, the current flowing in at least one of the plurality of current paths is detected, and the plurality of current paths are energized based on comparison with this threshold value. Since the state is detected, it is possible to adjust the sensitivity for detecting a sign of cable disconnection by setting a threshold value. Furthermore, abnormalities such as load disconnection can be detected.
  • the device is a device that detects a sign of disconnection of a cable that is connected to a load and supplies current to the load, and includes a current detection unit and an alarm unit.
  • the cable includes a plurality of current paths connected in parallel.
  • the current detection unit detects a sum or difference of currents flowing through at least two current paths among the plurality of current paths.
  • the alarm unit compares the detection value by the current detection unit with the threshold value, detects the energized state of the plurality of current paths, determines whether or not the plurality of current paths are disconnected, and determines that there is a disconnection , Issue an alarm.
  • an apparatus for detecting a sign of disconnection of a plurality of cables that are respectively connected to a plurality of connection portions of a load and energize a load includes a current detection unit and an alarm unit.
  • 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 includes a plurality of first current paths connected in parallel
  • the second cable includes a plurality of second current paths connected in parallel.
  • the current detection unit detects a sum or difference between a current flowing through at least one current path among the plurality of first current paths and a current flowing through at least one current path among the plurality of second current paths.
  • the alarm unit compares the detection value by the current detection unit with the threshold value, and detects the energization state of the plurality of first current paths and the energization state of the plurality of second current paths, thereby the plurality of first currents. The presence or absence of disconnection of the path and the plurality of second current paths is determined, and an alarm is issued when it is determined that there is a disconnection.
  • the energization state of the plurality of current paths is detected based on the combination of the currents flowing through the plurality of current paths for the first cable and the second cable connected to the load, the plurality of currents of the first cable is detected.
  • the combination of the presence or absence of disconnection of the current path of the path and the second cable can be detected.
  • an apparatus for detecting a sign of disconnection of a plurality of cables that are respectively connected to a plurality of connection portions of a load and energize a load includes a current detection unit and an alarm unit.
  • 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 includes a plurality of first current paths connected in parallel
  • the second cable includes a plurality of second current paths connected in parallel.
  • the current detection unit detects a sum or difference of currents flowing in at least one current path of the second current paths with respect to a sum or difference of currents flowing in at least two current paths of the first current paths.
  • the alarm unit compares the detection value by the current detection unit with the threshold value, and detects the energization state of the plurality of first current paths and the energization state of the plurality of second current paths, thereby the plurality of first currents. The presence or absence of disconnection of the path and the plurality of second current paths is determined, and an alarm is issued when it is determined that there is a disconnection.
  • the energization state of the plurality of current paths is detected based on the combination of the currents flowing through the plurality of current paths for the first cable and the second cable connected to the load, the plurality of currents of the first cable is detected.
  • the combination of the presence or absence of disconnection of the current path of the path and the second cable can be detected.
  • the threshold value is determined based on a detection value by the current detection unit in an initial state.
  • disconnection is detected based on the amount of change from the initial state, and disconnection sign detection by more accurate determination becomes possible.
  • a special cable can be detected without detecting a special cable.
  • FIG. 1 is a diagram showing a configuration of the entire heating device including a cable breakage sign detection device according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating 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 predetermined location.
  • FIG. 3 is a diagram 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.
  • FIG. 5 is a circuit diagram of a heating apparatus different from the heating apparatus shown in FIG. 1 in the configuration of the current path detected by the current detection unit 4.
  • FIG. 1 is a diagram showing a configuration of the entire heating device including a cable breakage sign detection device according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating 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
  • FIG. 6 is a diagram illustrating 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 predetermined location.
  • FIG. 7 is a circuit diagram of a heating device in which the configuration of the cable 31 is different from the heating device shown in FIG.
  • FIG. 8 shows the relationship between 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 result of the current detection unit 4 in a disconnected state at a predetermined location.
  • FIG. FIG. 9 is a circuit diagram of a heating device in which the configuration of the current detection unit is different from the example shown in FIG. FIG.
  • FIG. 10 shows the relationship between 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 result of the current detection unit 4 in a disconnected state at a predetermined location.
  • FIG. FIG. 11 is a circuit diagram of a heating device in which the current detection unit 4 detects currents flowing through the three current paths CA11, CA12, and CA13 constituting the cable 31.
  • FIG. 12 shows the relationship between 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 result of the current detection unit 4 in a disconnected state at a predetermined location.
  • FIG. FIG. 13 is a circuit diagram of a heating apparatus different from the example shown in FIG.
  • FIG. 14 is a diagram illustrating 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 predetermined location.
  • FIG. 15 is a circuit diagram of a heating apparatus different from the example shown in FIG.
  • FIG. 16 is a diagram illustrating 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 predetermined location.
  • FIG. 17 is a circuit diagram of a heating device different from the example shown in FIG. FIG.
  • FIG. 18 is a diagram illustrating 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 predetermined location.
  • FIG. 19 is a circuit diagram of a heating apparatus different from the example shown in FIG.
  • FIG. 20 is a diagram illustrating 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 predetermined location.
  • FIG. 21 is a circuit diagram of a heating device different from the example shown in FIG. FIG.
  • FIG. 22 is a diagram illustrating 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 predetermined location.
  • FIG. 23 is a circuit diagram of a heating apparatus different from the example shown in FIG.
  • FIG. 24 shows an example of a device in which a three-phase AC power source is connected to a heater 2 that is a three-phase AC load via a cable.
  • FIG. 25 is a diagram illustrating the relationship between the current flowing through the current paths CA11, CA12, CA21, CA22, CA31, and CA32 and the detection results of the current detection units CT1, CT2, and CT3 in a disconnected state at a predetermined location.
  • FIG. 1 is a diagram showing a configuration of the entire heating device including a cable breakage sign detection device according to an embodiment of the present invention.
  • a cable disconnection sign detection device 201 is connected to a heater 2 that is a load and detects a disconnection sign of cables 31 and 32 that energize the heater 2. It is.
  • the cable 31 includes a plurality of current paths CA11 and CA12 connected in parallel.
  • the cable disconnection sign detection device 201 compares the current detection unit 4 that detects a current flowing through one current path CA12 out of the plurality of current paths CA11 and CA12 with a detection value by the current detection unit 4 and a threshold value. By detecting the energized state of the plurality of current paths CA11 and CA12, the presence or absence of disconnection of the plurality of current paths CA11 and CA12 is determined. When it is determined that there is a disconnection, the alarm unit 10 outputs an alarm.
  • FIG. 1 is a diagram showing a configuration of the entire heating device including the cable breakage sign detection device according to the embodiment of the present invention.
  • the heating device 101 includes a power source 1, a heater 2, cables 31 and 32, a current detection unit 4, and an opening / closing unit 5.
  • the heater 2 corresponds to a “load” according to the present invention.
  • the heater 2 is connected to the power source 1 via cables 31 and 32. Cables 31 and 32 are current paths connecting the power source 1 and the heater 2.
  • the power source 1 is a single-phase AC power source
  • the heater 2 is a two-terminal load.
  • the cable 31 has an opening / closing portion 5 inserted in series.
  • the cable 31 includes two current paths CA11 and CA12.
  • the current detection unit 4 detects a current flowing through the current path CA12.
  • the current detector 4 is, for example, a current transformer (current transformer), and a resistor is connected to the secondary side to output a voltage proportional to the detected current.
  • Control unit 20 performs control related to opening / closing unit 5 and cable disconnection sign detection.
  • the opening / closing unit 5 is, for example, a solid state switch, and is opened / closed by an output signal from the output unit 16.
  • the setting unit 12 inputs a set value by manual input or communication from the outside, and stores the value in the storage unit 13.
  • the current measurement unit 11 measures current based on the detection value of the current detection unit 4. Based on the value stored in the storage unit 13 and the value measured by the current measurement unit 11, the determination unit 14 determines whether or not there is an abnormal state. When the determination unit 14 determines that the state is abnormal, the abnormality output unit 15 issues an alarm according to relay output, indicator light emission, communication flag setting, or the like.
  • 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 predetermined location.
  • i11 is a current flowing through the first current path CA11
  • i12 is a current flowing through the second current path CA12
  • iCT is a detection value of the current detection unit 4 (measurement value of the current measurement unit 11). Both are relative values when the current flowing through the heater 2 is 1.0.
  • the measured current value is 0.5.
  • 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 is 1.0.
  • the second current path CA12 is disconnected, the measured current value is zero. The measured current value is 0 even when the heater itself is disconnected.
  • the setting unit 12 shown in FIG. 1 stores the upper and lower limit values, for example, 0.25 and 0.75 in the storage unit 13 in advance.
  • the determination unit 14 uses the value in the storage unit 13 as a threshold and determines the magnitude relationship with the measured current value.
  • FIG. 3 is a diagram showing the relationship between the threshold value and the measured current value. If the measured current value is 0.25 or more and less than 0.75, it is considered normal. That is, it is determined that there is no disconnection of the current path. If the measured current value is 0.75 or more, it is considered that the first current path CA11 is disconnected. If the measured current value is less than 0.25, it is considered that the second current path CA12 is disconnected. That is, this is detected as a sign that the cable 31 is disconnected.
  • the disconnection of the second current path CA12 and the disconnection of the heater 2 cannot be distinguished.
  • FIG. 4 is a flowchart showing the processing contents of the control unit 20 shown in FIG.
  • the current value storage flag is reset, and the state of the output unit is determined (S1 ⁇ S2). If the state of the output unit is ON, that is, if the switch is ON, the measured current value is read (S3). Based on this value, a threshold value is determined and registered, and a current value storage flag is set (S4 ⁇ S5 ⁇ S6). In the example shown in FIG. 3, if the initial measured current value is 0.5, a value (0.75, 0.25) obtained by adding or subtracting the relative fluctuation amount 0.25 to that value is registered as the threshold value.
  • FIG. 5 is a circuit diagram of a heating apparatus different from the heating apparatus shown in FIG. 1 in the configuration of the current path detected by the current detection unit 4.
  • the current detection unit 4 detects a difference between currents flowing through the two current paths CA11 and CA12.
  • FIG. 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 predetermined location.
  • i11 is a current flowing through the first current path CA11
  • i12 is a current flowing through the second current path CA12
  • iCT is a detection value of the current detection unit 4. Both are relative values when the current flowing through the heater 2 is 1.0.
  • 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.
  • 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 is 1.0 and the measured current value is 1.0.
  • the second current path CA12 is disconnected, the current flowing through the heater 2 flows only through the first current path CA11. Therefore, the current flowing through the first current path CA11 is 1.0, and the measured current value is ⁇ 1.0. .
  • the measured current value is zero.
  • the setting unit 12 shown in FIG. 1 stores, for example, 0.5 and ⁇ 0.5 in advance in the storage unit 13 as upper and lower limit values.
  • the determination unit 14 uses the value in the storage unit 13 as a threshold and determines the magnitude relationship with the measured current value. If the measured current value is ⁇ 0.5 or more and less than 0.5, it is regarded as normal. That is, it is determined that there is no disconnection of the current path. If the measured current value is 0.5 or more, it is considered that the first current path CA11 is disconnected. If the measured current value is less than ⁇ 0.5, it is considered that the second current path CA12 is disconnected. That is, these are detected as a sign that the cable 31 is disconnected.
  • FIG. 7 is a circuit diagram of a heating device in which the configuration of the cable 31 is different from that of the heating device shown in FIG.
  • the cable 31 includes three current paths CA11, CA12, and CA13.
  • the current detection unit 4 detects a current flowing through the current path CA13.
  • FIG. 8 shows the relationship between 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 result of the current detection unit 4 in a disconnected state at a predetermined location.
  • i11 is a current flowing through the first current path CA11
  • i12 is a current flowing through the second current path CA12
  • i13 is a current flowing through the third current path CA13
  • iCT is a detection value of the current detector 4. Both are relative values when the current flowing through the heater 2 is 1.0.
  • 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.
  • 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. Therefore, the current flowing through the third current path CA13 is 0.5, and the measured current value is 0. .5.
  • 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. Therefore, the current flowing through the third current path CA13 is 0.5, and the measured current value is 0. .5.
  • the third current path CA13 is disconnected
  • the current flowing through the third current path CA13 is 0, and the measured current value is 0.
  • the heater itself is disconnected
  • the setting unit 12 illustrated in FIG. 1 stores 0.166, which is an intermediate value between 1/3 and 0, as the lower limit value in the storage unit 13 in advance, and 0 as the upper limit value.
  • 0.416 which is an intermediate value between 0.5 and 1/3 is stored in advance.
  • the determination unit 14 uses the value in the storage unit 13 as a threshold and determines the magnitude relationship with the measured current value. If the measured current value is not less than 0.166 and less than 0.416, it is regarded as normal. That is, it is determined that there is no disconnection of the current path. If the measured current value is 0.416 or more, it is considered that the first current path CA11 or the second current path CA12 is disconnected. If the measured current value is less than 0.166, it is considered that the third current path CA13 is disconnected. That is, these are detected as a sign that the cable 31 is disconnected.
  • the disconnection of the third current path CA13 and the disconnection of the heater 2 cannot be distinguished.
  • FIG. 9 is a circuit diagram of a heating device in which the configuration of the current detection unit is different from the example shown in FIG.
  • the cable 31 includes three current paths CA11, CA12, and CA13.
  • the current detection unit 4 detects an added value of the current flowing through the current path CA12 and the current flowing through the current path CA13.
  • FIG. 10 shows the relationship between 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 result of the current detection unit 4 in a disconnected state at a predetermined location.
  • i11 is a current flowing through the first current path CA11
  • i12 is a current flowing through the second current path CA12
  • i13 is a current flowing through the third current path CA13
  • iCT is a detection value of the current detection unit 4. Both are relative values when the current flowing through the heater 2 is 1.0.
  • 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.
  • the measured current value is 1.0.
  • 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, and thus the measured current value is 0.5.
  • 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 is 0.5.
  • the measured current value is zero.
  • the setting unit 12 illustrated in FIG. 1 stores in advance, in the storage unit 13, 0.583 that is an intermediate value between 2/3 and 0.5 as the lower limit value, and sets the upper limit value.
  • 0.833 which is an intermediate value between 1.0 and 2/3, is stored in advance.
  • the determination unit 14 uses the value in the storage unit 13 as a threshold and determines the magnitude relationship with the measured current value. If the measured current value is 0.583 or more and less than 0.833, it is considered normal. That is, it is determined that there is no disconnection of the current path. If the measured current value is 0.833 or more, it is considered that the first current path CA11 is disconnected. If the measured current value is less than 0.583, it is considered that the second current path CA12 or the third current path CA13 is disconnected. That is, these are detected as a sign that the cable 31 is disconnected.
  • FIG. 11 is a circuit diagram of a heating device in which the current detection unit 4 detects currents flowing through the three current paths CA11, CA12, and CA13 constituting the cable 31.
  • the cable 31 includes 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.
  • FIG. 12 shows the relationship between 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 result of the current detection unit 4 in a disconnected state at a predetermined location.
  • i11 is a current flowing through the first current path CA11
  • i12 is a current flowing through the second current path CA12
  • i13 is a current flowing through the third current path CA13
  • iCT is a detection value of the current detection unit 4. Both are relative values when the current flowing through the heater 2 is 1.0.
  • 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.
  • 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 is 1.0.
  • 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, and thus the measured current value is zero.
  • 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 is zero.
  • the heater itself is disconnected
  • the setting unit 12 illustrated in FIG. 1 stores in advance, in the storage unit 13, 0.166 that is an intermediate value between 1/3 and 0 as the lower limit value, and 1 as the upper limit value.
  • 0.666 which is an intermediate value between 0.0 and 1/3, is stored in advance.
  • the determination unit 14 uses the value in the storage unit 13 as a threshold and determines the magnitude relationship with the measured current value. If the measured current value is 0.166 or more and less than 0.666, it is considered normal. That is, it is determined that there is no disconnection of the current path. If the measured current value is 0.666 or more, it is considered that the first current path CA11 is disconnected. If the measured current value is less than 0.166, it is considered that the second current path CA12 or the third current path CA13 is disconnected. That is, these are detected as a sign that the cable 31 is disconnected.
  • FIG. 13 is a circuit diagram of a heating device different from the example shown in FIG.
  • the current detection unit 4 calculates the difference between the current flowing in the current path CA12 out of the two current paths CA11 and CA12 configuring the first cable 31 and the current flowing in the current path CA2 configuring the second cable. To detect.
  • FIG. 14 is a diagram illustrating 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 predetermined location.
  • i11 is a current flowing through the current path CA11
  • i12 is a current flowing through the current path CA12
  • i2 is a current flowing through the current path CA2
  • iCT is a detection value of the current detection unit 4. Both are relative values when the current flowing through the heater 2 is 1.0.
  • 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. .
  • the current flowing through the heater 2 flows through the current path CA12 and the current path CA2, so the measured current value is zero.
  • 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 is ⁇ 1.0.
  • the measured current value is zero.
  • the measured current value is also 0 when the heater itself is disconnected.
  • the setting unit 12 shown in FIG. 1 stores in advance, in the storage unit 13, -0.25, which is an intermediate value between -0.5 and 0, as the upper limit value. Further, -0.75, which is an intermediate value between -0.5 and -1.0, is stored in advance as a lower limit value.
  • the determination unit 14 uses the value in the storage unit 13 as a threshold and determines the magnitude relationship with the measured current value. If the measured current value is between ⁇ 0.75 and ⁇ 0.25, it is considered normal. That is, it is determined that there is no disconnection of the current path. If the measured current value is ⁇ 0.25 or more, it is considered that one of the current paths CA11 and CA2 is disconnected. If the measured current value is less than ⁇ 0.75, it is considered that the current path CA12 is disconnected. These are detected as a sign that the cable 31 is disconnected.
  • FIG. 15 is a circuit diagram of a heating apparatus different from the example shown in FIG.
  • the current detection unit 4 calculates the sum of the current flowing in the current path CA12 out of the two current paths CA11 and CA12 configuring the first cable 31 and the current flowing in the current path CA2 configuring the second cable. To detect.
  • FIG. 16 is a diagram illustrating the relationship between the current flowing in the current paths CA11, CA12, and CA2 and the measurement result of the current detection unit 4 in a disconnected state at a predetermined location.
  • i11 is a current flowing in the current path CA11
  • i12 is a current flowing in the current path CA12
  • i2 is a current flowing in the current path CA2
  • iCT is a detection value of the current detection unit 4. Both are relative values when the current flowing through the heater 2 is 1.0.
  • 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. is there.
  • 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 is 2.0.
  • 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 is 1.0.
  • the measured current value is zero.
  • the measured current value is also 0 when the heater itself is disconnected.
  • the setting unit 12 illustrated in FIG. 1 stores, in the storage unit 13, 1.25, which is an intermediate value between 1.5 and 1 as the lower limit value, and 2 as the upper limit value. 1.75, which is an intermediate value between 0.0 and 1.5, is stored in advance.
  • the determination unit 14 uses the value in the storage unit 13 as a threshold and determines the magnitude relationship with the measured current value. If the measured current value is 1.25 or more and less than 1.75, it is considered normal. That is, it is determined that there is no disconnection of the current path. If the measured current value is 1.75 or more, it is considered that the current path CA11 is disconnected. If the measured current value is less than 1.25, it is considered that the current path CA12 or the current path CA2 is disconnected. That is, these are detected as a sign that the cable 31 is disconnected.
  • FIG. 17 is a circuit diagram of a heating device different from the example shown in FIG.
  • the current detection unit 4 includes a current flowing through the current path CA12 out of the two current paths CA11 and CA12 configuring the first cable 31, and a current out of the two current paths CA21 and CA22 configuring the second cable 32. The sum of the current flowing through the current path CA22 is detected.
  • FIG. 18 is a diagram illustrating 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 predetermined location.
  • i11 is a current flowing in the current path CA11
  • i12 is a current flowing in the current path CA12
  • i21 is a current flowing in the current path CA21
  • i22 is a current flowing in the current path CA22
  • iCT is a detection value of the current detection unit 4. is there. Both are relative values when the current flowing through the heater 2 is 1.0.
  • the currents flowing through the current paths CA11, CA12, CA21, and CA22 are all 0.5, so the measured current value is 1.0.
  • the current path CA11 is disconnected, the current flowing through the heater 2 flows through the current path CA12, so the measured current value is 1.5.
  • the current path CA12 is disconnected, the current flowing through the heater 2 flows through the current path CA11, so the measured current value is 0.5.
  • the current path CA21 is disconnected, the current flowing through the heater 2 flows through the current path CA22, so the measured current value is 1.5.
  • the measured current value is 0.5.
  • the measured current value is zero.
  • the setting unit 12 illustrated in FIG. 1 stores in advance 0.75, which is an intermediate value between 1.0 and 0.5, as the lower limit value in the storage unit 13, and sets the upper limit value.
  • 1.25 which is an intermediate value between 1.0 and 1.5, is stored in advance.
  • the determination unit 14 uses the value in the storage unit 13 as a threshold and determines the magnitude relationship with the measured current value. If the measured current value is not less than 0.75 and less than 1.25, it is regarded as normal. That is, it is determined that there is no disconnection of the current path. If the measured current value is less than 0.75, it is considered that one of the current paths CA12 and CA22 is disconnected. Further, if the measured current value is 1.25 or more, it is considered that one of the current paths CA11 and CA21 is disconnected. That is, these are detected as a sign that the cable 31 is disconnected.
  • FIG. 19 is a circuit diagram of a heating device different from the example shown in FIG.
  • the current detection unit 4 includes a current flowing through the current path CA12 out of the two current paths CA11 and CA12 configuring the first cable 31, and a current out of the two current paths CA21 and CA22 configuring the second cable 32. A difference from the current flowing through the current path CA22 is detected.
  • FIG. 20 is a diagram illustrating 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 predetermined location.
  • i11 is a current flowing through the current path CA11
  • i12 is a current flowing through the current path CA12
  • i21 is a current flowing through the current path CA21
  • i22 is a current flowing through the current path CA22
  • iCT is a detection value of the current detection unit 4. is there. Both are relative values when the current flowing through the heater 2 is 1.0.
  • the currents flowing through the current paths CA11, CA12, CA21, CA22 are all 0.5, so the measured current value is 0.
  • the current path CA11 is disconnected, the current flowing through the heater 2 flows through the current path CA12, so the measured current value is 0.5.
  • the current path CA12 is disconnected, the current flowing through the heater 2 flows through the current path CA11, so the measured current value is ⁇ 0.5.
  • the current path CA21 is disconnected, the current flowing through the heater 2 flows through the current path CA22, so the measured current value is ⁇ 0.5.
  • the measured current value is 0.5.
  • the measured current value is zero.
  • the setting unit 12 shown in FIG. 1 stores in advance, in the storage unit 13, ⁇ 0.25, which is an intermediate value between 0 and ⁇ 0.5, as the lower limit value.
  • 0.25 which is an intermediate value between 0 and 0.5, is stored in advance.
  • the determination unit 14 uses the value in the storage unit 13 as a threshold and determines the magnitude relationship with the measured current value. If the measured current value is ⁇ 0.25 or more and less than 0.25, it is regarded as normal. That is, it is determined that there is no disconnection of the current path. If the measured current value is less than ⁇ 0.25, it is considered that one of the current paths CA12 and CA21 is disconnected. Further, if the measured current value is 0.25 or more, it is considered that one of the current paths CA11 and CA22 is disconnected. That is, these are detected as a sign that the cable 31 is disconnected.
  • FIG. 21 is a circuit diagram of a heating device different from the example shown in FIG.
  • the current detection unit 4 includes the difference between the currents flowing in the two current paths CA11 and CA12 constituting the first cable 31 and the current path CA22 among the two current paths CA21 and CA22 constituting the second cable 32. The difference between the current flowing in the
  • FIG. 22 is a diagram illustrating 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 predetermined location.
  • i11 is a current flowing through the current path CA11
  • i12 is a current flowing through the current path CA12
  • i21 is a current flowing through the current path CA21
  • i22 is a current flowing through the current path CA22
  • iCT is a detection value of the current detection unit 4. is there. Both are relative values when the current flowing through the heater 2 is 1.0.
  • the currents flowing through the current paths CA11, CA12, CA21, and CA22 are all 0.5, so the measured current value is 0.5.
  • the current path CA11 is disconnected, the current flowing through the heater 2 flows through the current path CA12, so the measured current value is 1.5.
  • the current path CA12 is disconnected, the current flowing through the heater 2 flows through the current path CA11, so the measured current value is ⁇ 0.5.
  • the current path CA21 is disconnected, the current flowing through the heater 2 flows through the current path CA22, so the measured current value is 1.0.
  • the measured current value is zero.
  • the measured current value is zero.
  • the setting unit 12 illustrated in FIG. 1 stores 0.25, which is an intermediate value between 0 and 0.5, as the lower limit value in the storage unit 13 in advance, and 0 as the upper limit value.
  • 0.75 which is an intermediate value between .5 and 1.0, is stored in advance.
  • the determination unit 14 uses the value in the storage unit 13 as a threshold and determines the magnitude relationship with the measured current value. If the measured current value is not less than 0.25 and less than 0.75, it is regarded as normal. That is, it is determined that there is no disconnection of the current path. If the measured current value is less than 0.25, it is considered that one of the current paths CA12 and CA22 is disconnected. Further, if the measured current value is 0.75 or more, it is considered that one of the current paths CA11 and CA21 is disconnected. That is, these are detected as a sign that the cable 31 is disconnected.
  • FIG. 23 is a circuit diagram of a heating apparatus different from the example shown in FIG.
  • a current detection unit is provided not only on the first cable 31 side shown in FIG. 1 but also on the second cable 32 side, and a sign of disconnection of the cable is detected from the detection results of these two current detection units. Is.
  • the presence / absence of disconnection of the current paths CA21 and CA22 of the second cable 32 can be detected based on the same principle as that of the example shown in FIG. .
  • the configuration of the current detection unit shown in FIGS. 5, 7, 9, 11, 13, 15, 17, 19, 21, etc. is provided on the second cable 32 side. From the detection results of the two current detection units, it is also possible to detect a sign of cable disconnection.
  • FIG. 24 is an example of an apparatus in which a three-phase AC power source is connected to a heater 2 that is a three-phase AC load via a cable.
  • the heater 2 is connected to each line of the three-phase AC power supply via two current paths.
  • current detection part CT1, CT2, CT3 is each connected to one of the two current paths of each phase.
  • FIG. 25 is a diagram illustrating the relationship between the current flowing through the current paths CA11, CA12, CA21, CA22, CA31, and CA32 and the detection results of the current detection units CT1, CT2, and CT3 in a disconnected state at a predetermined location.
  • FIG. 25 is a diagram illustrating the relationship between the current flowing through the current paths CA11, CA12, CA21, CA22, CA31, and CA32 and the detection results of the current detection units CT1, CT2, and CT3 in a disconnected state at a predetermined location.
  • i11 is a current flowing in the current path CA11
  • i12 is a current flowing in the current path CA12
  • i21 is a current flowing in the current path CA21
  • i22 is a current flowing in the current path CA22
  • i31 is a current flowing in the current path CA31
  • i32 Is a current flowing through the current path CA32
  • iCT1 is a detection value of the current detection unit CT1
  • iCT2 is a detection value of the current detection unit CT2
  • iCT3 is a detection value of the current detection unit CT3. Both are relative values when the phase current flowing through the heater 2 is 1.0.
  • the lower limit threshold value to be compared with the detection value of the current detection unit CT1 is set to 0.25, and the upper limit threshold value is set to 0.75.
  • the current detectors CT2 and CT3. In this manner, a sign of disconnection of the cables 31, 32, and 33 can be detected from the detection results of the three current detection units CT1, CT2, and CT3.
  • a cable caulking portion is provided at a portion where the cable is branched into a plurality of current paths, but when the contact resistance of the cable caulking portion is not uniform, the shunt ratio to the plurality of current paths is not equal.
  • a threshold value may be determined according to the actual diversion ratio to the plurality of current paths.
  • FIG. 4 shows an example in which the threshold value is determined based on the measured initial current value.
  • the normal current value may change due to aging of the load, cable, cable connection part, and the like.
  • the threshold value may be reset at a predetermined timing based on the measured current value.
  • the heating device using the heater as a load has been exemplified.
  • the present invention can be similarly applied to a device using a motor or an electromagnet as a load.
  • a current transformer (current transformer) is used for the current detection unit.
  • a current detection resistor element is inserted in each current path, and the voltage drop is based on the voltage drop.
  • the current flowing through the current path may be detected.
  • a rectifier circuit that determines the peak value of the current
  • a polarity determination unit that determines the polarity of the sine wave
  • a calculation unit that adds and subtracts in consideration of the polarities of the peak values determined for a plurality of current paths may be provided. .
  • CA11 ... 1st 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 part 1 ... Power source 2 ... Heater 4 ... Current detection unit 5 ... Opening / closing unit 10 ... Alarm unit 11 ... Current measuring unit 12 ... Setting unit 13 ... Storage unit 14 ... Determining unit 15 ... Abnormal output unit 16 ... Output unit 20 ... Control unit 31 ... First cable 32 ... No. 2 cables 33... Cable 101... Heating device 201.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
PCT/JP2019/001740 2018-02-28 2019-01-22 ケーブル断線予兆検知装置 WO2019167472A1 (ja)

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JPH1164420A (ja) * 1997-08-27 1999-03-05 Kubota Corp 断線検知装置
JPH11225429A (ja) * 1998-02-06 1999-08-17 Fujitsu Denso Ltd リモートセンス式電源供給装置
JP2008202974A (ja) * 2007-02-16 2008-09-04 Nippon Steel Engineering Co Ltd 給電ケーブルの断線検出方法
JP2010181255A (ja) * 2009-02-05 2010-08-19 Omron Corp 断線検出装置、制御装置および電力調整器
JP2012527978A (ja) * 2009-05-27 2012-11-12 ソラテック コーポレーション 冗長導体のモニタリング
JP2015021923A (ja) * 2013-07-23 2015-02-02 株式会社日本製鋼所 給電線の劣化・断線検出方法

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US5602709A (en) * 1992-07-10 1997-02-11 Technisearch Limited High impedance fault detector
JPH11255429A (ja) * 1998-03-09 1999-09-21 Tanaka Seiki Kk 被覆除去装置

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Publication number Priority date Publication date Assignee Title
JPH1164420A (ja) * 1997-08-27 1999-03-05 Kubota Corp 断線検知装置
JPH11225429A (ja) * 1998-02-06 1999-08-17 Fujitsu Denso Ltd リモートセンス式電源供給装置
JP2008202974A (ja) * 2007-02-16 2008-09-04 Nippon Steel Engineering Co Ltd 給電ケーブルの断線検出方法
JP2010181255A (ja) * 2009-02-05 2010-08-19 Omron Corp 断線検出装置、制御装置および電力調整器
JP2012527978A (ja) * 2009-05-27 2012-11-12 ソラテック コーポレーション 冗長導体のモニタリング
JP2015021923A (ja) * 2013-07-23 2015-02-02 株式会社日本製鋼所 給電線の劣化・断線検出方法

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