WO2022209490A1 - 絶縁抵抗監視装置 - Google Patents
絶縁抵抗監視装置 Download PDFInfo
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- WO2022209490A1 WO2022209490A1 PCT/JP2022/007957 JP2022007957W WO2022209490A1 WO 2022209490 A1 WO2022209490 A1 WO 2022209490A1 JP 2022007957 W JP2022007957 W JP 2022007957W WO 2022209490 A1 WO2022209490 A1 WO 2022209490A1
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- insulation resistance
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- humidity
- under test
- phase motor
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- 238000009413 insulation Methods 0.000 title claims abstract description 387
- 238000012806 monitoring device Methods 0.000 title claims description 109
- 238000012360 testing method Methods 0.000 claims description 55
- 238000005259 measurement Methods 0.000 abstract description 22
- 238000000034 method Methods 0.000 description 23
- 238000012544 monitoring process Methods 0.000 description 21
- 238000012545 processing Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 238000004804 winding Methods 0.000 description 6
- 238000007689 inspection Methods 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000001131 transforming effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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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
- G01R31/34—Testing dynamo-electric machines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/005—Circuits arrangements for indicating a predetermined temperature
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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
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Definitions
- the present disclosure relates to an insulation resistance monitoring device.
- Electricity Business Act to undergo legal inspections at a frequency of about once a year.
- electric equipment such as motors connected to switchboards is subject to self-inspection at intervals of once a week to once a month, according to their own management standards.
- the objects of self-inspection include a wide variety of electrical facilities and equipment, and the reality is that there are too many of them to handle. Therefore, an insulation resistance monitoring device has been developed for automating the self-inspection.
- Patent Literature 1 discloses an insulation resistance monitoring device provided with a switch that opens and closes a connection path between a power wire or ground wire of an object to be measured and a voltage generator of the insulation resistance monitoring device.
- the insulation resistance of the object to be measured may fluctuate depending on the environmental conditions surrounding the object to be measured. For this reason, a temporarily increased insulation resistance is acquired, and as a result, there is a risk of overlooking deterioration in insulation performance that should be inspected for the object to be measured. Moreover, when the insulation resistance fluctuates, it cannot be determined whether the cause of the fluctuation is the influence of the surrounding environment or the deterioration of the insulation performance. Therefore, it is required to measure the insulation resistance of the object to be measured with high accuracy in consideration of the variation of the insulation resistance caused by the surrounding environment of the object to be measured.
- An object of the present disclosure is to provide an insulation resistance monitoring device capable of measuring the insulation resistance of an object to be measured with high accuracy, taking into account variations in insulation resistance caused by the surrounding environment of the object to be measured. .
- An insulation resistance monitoring device includes: an insulation resistance measuring instrument that measures and outputs the insulation resistance of the object under test; an operation information receiving unit that receives information indicating that the device under test is in operation or at rest; a humidity information receiving unit that receives the humidity in the vicinity of the object to be measured; When the object to be measured is stopped and the humidity in the vicinity of the object to be measured is equal to or higher than a first threshold value, the insulation resistance of the object to be measured is measured and output. and a controller for controlling the measuring device.
- the insulation resistance monitoring device further comprises a timer that measures the elapsed time since the object under test stopped, The controller determines that the object to be measured is stopped, a predetermined first time period has elapsed since the object to be measured has stopped, and the humidity in the vicinity of the object to be measured has reached the first is equal to or higher than the threshold value, the insulation resistance measuring instrument is controlled to measure and output the insulation resistance of the object to be measured.
- the insulation resistance monitoring device further comprises a storage device that stores the insulation resistance of the object under test measured by the insulation resistance measuring instrument,
- the controller is controlling the insulation resistance meter to measure the insulation resistance of the object under test over a second predetermined time period; storing in the storage device the insulation resistance of the object under test measured by the insulation resistance measuring instrument and the humidity in the vicinity of the object under test received when the insulation resistance of the object under test was measured; , By selecting the humidity corresponding to the minimum insulation resistance among the plurality of insulation resistances stored in the storage device as the first threshold, setting the first threshold;
- the controller sets the first threshold when the period during which the humidity in the vicinity of the object under test is less than the first threshold exceeds a predetermined third time period.
- the insulation resistance monitoring device further comprises a temperature information receiving unit that receives the temperature in the vicinity of the object under test, The controller determines that the object to be measured is stopped, the humidity in the vicinity of the object to be measured is equal to or higher than the first threshold value, and the temperature in the vicinity of the object to be measured is equal to or higher than the second threshold value.
- the insulation resistance measuring instrument is controlled to measure and output the insulation resistance of the object to be measured.
- the insulation resistance monitoring device further comprises a timer that measures the elapsed time since the object under test stopped, The controller determines that the object to be measured is stopped, a predetermined first time period has elapsed since the object to be measured has stopped, and the humidity in the vicinity of the object to be measured has reached the first level.
- the insulation resistance measuring instrument is configured to measure and output the insulation resistance of the object to be measured. Control.
- the insulation resistance monitoring device further comprises a storage device that stores the insulation resistance of the object under test measured by the insulation resistance measuring instrument,
- the controller is controlling the insulation resistance meter to measure the insulation resistance of the object under test over a second predetermined time period; storing the insulation resistance of the object under test measured by the insulation resistance measuring instrument and the temperature in the vicinity of the object under test received when the insulation resistance of the object under test was measured in the storage device; , By selecting a temperature corresponding to a minimum insulation resistance among a plurality of insulation resistances stored in the storage device as the second threshold, setting the second threshold;
- the controller sets the second threshold when the period during which the temperature in the vicinity of the object under test is less than the second threshold exceeds a predetermined third time period.
- the insulation resistance monitoring device it is possible to measure the insulation resistance of the object to be measured with high accuracy, taking into consideration the variation in the insulation resistance of the object to be measured due to the surrounding environment.
- FIG. 1 is a block diagram showing an example of a configuration of a motor system including an insulation resistance monitoring device 40 according to a first embodiment
- FIG. FIG. 2 is a graph showing an example of characteristics of the insulation resistance value Ro of the three-phase motor device 30 of FIG. 1 with respect to humidity and temperature
- FIG. 2 is an exemplary timing chart showing measurement of an insulation resistance value Ro of the three-phase motor device 30 by the insulation resistance monitoring device 40 of FIG. 1
- 4 is a flowchart showing an example of insulation resistance monitoring processing executed by the controller 46 of FIG. 1
- FIG. 11 is a block diagram showing an example of the configuration of a motor system including an insulation resistance monitoring device 40A according to a second embodiment
- FIG. 6 is an exemplary timing chart showing measurement of the insulation resistance value Ro of the three-phase motor device 30A by the insulation resistance monitoring device 40A of FIG. 5;
- FIG. 6 is a flow chart showing an example of insulation resistance monitoring processing executed by the controller 46A of FIG. 5;
- FIG. FIG. 11 is a block diagram showing an example of a configuration of a motor system including an insulation resistance monitoring device 40B according to a third embodiment;
- FIG. 9 is an exemplary timing chart showing measurement of the insulation resistance value Ro of the three-phase motor device 30 by the insulation resistance monitoring device 40B of FIG. 8;
- FIG. 9 is a flowchart showing an example of insulation resistance monitoring processing executed by a controller 46B in FIG. 8;
- FIG. 11 is a block diagram showing an example of a configuration of a motor system including an insulation resistance monitoring device 40C according to a fourth embodiment
- FIG. 12 is an exemplary timing chart showing measurement of the insulation resistance value Ro of the three-phase motor device 30A by the insulation resistance monitoring device 40C of FIG. 11
- 12 is a table showing insulation resistance values Ro of the three-phase motor device 30A measured under various humidity and temperature conditions by the insulation resistance monitoring device 40C of FIG. 11
- FIG. 12 is a flowchart showing an example of insulation resistance monitoring processing executed by a controller 46C of FIG. 11
- FIG. FIG. 15 is a flowchart showing a subroutine of threshold value setting processing in step S32 of FIG. 14
- FIG. FIG. 12 is a flow chart showing a modification of the insulation resistance monitoring process executed by the controller 46C of FIG. 11;
- FIG. 1 is a block diagram showing an example of the configuration of a motor system including an insulation resistance monitoring device 40 according to the first embodiment.
- the motor system of FIG. 1 includes, for example, a three-phase AC power supply device 10, a circuit breaker 20, a three-phase motor device 30, and an insulation resistance monitoring device 40.
- the three-phase AC power supply 10 supplies three-phase AC power to the three-phase motor device 30 via the circuit breaker 20 .
- the example of FIG. 1 shows a case where the insulation resistance monitoring device 40 measures the insulation resistance value Ro of the three-phase motor device 30 as the object to be measured.
- the insulation resistance monitoring device 40 includes a current measuring device 41, an insulation resistance calculator 42, a display device 43, an operation information receiving section 44, a humidity information receiving section 45, a controller 46, a voltage source E1, and a switch SW.
- a voltage source E1 supplies a predetermined voltage to be applied between two nodes of the three-phase motor device 30 that are insulated from each other.
- the switch SW opens and closes the circuit between the three-phase motor device 30 and the voltage source E1.
- a current measuring device 41 measures a leakage current flowing between two mutually insulated nodes of the three-phase motor device 30 due to the voltage supplied by the voltage source E1.
- the insulation resistance calculator 42 calculates the insulation resistance value Ro of the three-phase motor device 30 based on the leakage current measured by the current measuring device 41 .
- the display device 43 outputs the insulation resistance value Ro calculated by the insulation resistance calculator 42 .
- the current measuring device 41, the insulation resistance calculator 42, the display device 43, the voltage source E1, and the switch SW are examples of insulation resistance measuring devices that measure and output the insulation resistance value Ro of the three-phase motor device 30.
- the operation information receiving unit 44 receives and acquires information indicating that the three-phase motor device 30 is in operation or stopped.
- the humidity information receiving unit 45 receives and acquires the humidity in the vicinity of the three-phase motor device 30 .
- the controller 46 controls the insulation resistance value Ro is measured and output via the display device 43, the insulation resistance calculator 42 is controlled.
- FIG. 2 is a graph showing an example of characteristics of the insulation resistance value Ro of the three-phase motor device 30 of FIG. 1 with respect to humidity and temperature.
- the insulation resistance of the object to be measured by the insulation resistance monitoring device 40 may fluctuate depending on the environmental conditions surrounding the object to be measured.
- the insulation resistance of the three-phase motor device 30 may fluctuate depending on the humidity and temperature (air temperature) in the vicinity of the three-phase motor device 30 .
- the insulation resistance of the three-phase motor device 30 is measured when the humidity and temperature are temporarily lowered, a temporarily increased insulation resistance is obtained. There is a risk of overlooking the deterioration of the insulation performance. Moreover, when the insulation resistance fluctuates, it cannot be determined whether the cause of the fluctuation is the influence of the surrounding environment (that is, humidity or temperature) or the deterioration of the insulation performance. Therefore, it is required to measure the insulation resistance of the object to be measured with high accuracy in consideration of the variation of the insulation resistance caused by the surrounding environment of the object to be measured.
- the insulation resistance value Ro of the three-phase motor device 30 is measured and output when the humidity in the vicinity of the three-phase motor device 30 is equal to or higher than the threshold value Th1.
- the insulation resistance value Ro when the humidity is lower than the threshold value Th1 is neither measured nor output (at least, such an insulation resistance value Ro is not output). Therefore, when a high insulation resistance value Ro is measured and output, it can be determined that the insulation performance of the three-phase motor device 30 has not deteriorated. Also, when a low insulation resistance value Ro is measured and output, it can be determined that the insulation performance of the three-phase motor device 30 has deteriorated.
- the insulation resistance of the three-phase motor device 30 is The resistance value Ro can be measured with high accuracy and presented to the user.
- the insulation resistance value Ro of the three-phase motor device 30 is measured and output in consideration of the humidity in the vicinity of the three-phase motor device 30 .
- a three-phase AC power supply device 10 includes three single-phase AC power supplies 11-13.
- Single-phase AC power sources 11 to 13 generate single-phase AC voltages having phases different from each other by 120 degrees.
- the single-phase AC power supplies 11 to 13 are connected to each other in a delta connection.
- Nodes N1-N3, which connect the single-phase AC power supplies 11-13, are connected to the circuit breaker 20 and the three-phase motor device 30 via U-phase, V-phase, and W-phase power supply lines.
- the three-phase AC power supply device 10 may include a switchboard, high-voltage receiving and transforming equipment, and the like.
- the high-voltage power receiving and transforming equipment steps down the voltage of, for example, 6600V supplied from the electric power company to a voltage of, for example, about 200V to 480V.
- the switchboard distributes the stepped-down voltage to the three-phase motor device 30 and other load devices.
- the circuit breaker 20 includes switches 21 to 23 inserted in the U-phase, V-phase, and W-phase power supply lines. Circuit breaker 20 further comprises an operation sensor 24 that detects the on/off of switches 21-23, thereby detecting whether three-phase motor device 30 is operating or not.
- the motion sensor 24 may be, for example, another switch that turns on/off in conjunction with the switches 21-23.
- the three-phase motor device 30 includes windings 31 to 33 and a housing 34.
- the windings 31-33 are connected to each other in a delta connection.
- Nodes N4 to N6 connecting the windings 31 to 33 to each other are connected to the U-phase, V-phase and W-phase power supply lines.
- Housing 34 is another node electrically isolated from windings 31-33. Housing 34 may be grounded.
- a leakage current may flow between the windings 31 to 33 and the housing 34.
- the example of FIG. 1 shows a case where a ground insulation resistance 35 through which a leakage current corresponding to the resistance flows is generated between the node N4 and the housing 34 .
- the ground insulation resistance 35 has an insulation resistance value Ro.
- the three-phase motor device 30 further includes a humidity sensor 36 that detects humidity in the vicinity of the three-phase motor device 30 .
- the “neighborhood” of the three-phase motor device 30 includes a position where humidity affecting the insulation resistance value Ro of the three-phase motor device 30 can be detected, for example, the inside of the housing 34 .
- the voltage source E1 supplies a predetermined voltage to be applied between two mutually insulated nodes of the three-phase motor device 30, that is, between the node N4 and the housing 34 in the example of FIG.
- a voltage source E1 supplies a DC voltage of, for example, 50V.
- the switch SW opens and closes the circuit between the three-phase motor device 30 and the voltage source E1.
- the switch SW may be, for example, a mechanical switch operated by a user, or a reed relay that operates according to an external control signal.
- the resistance value when the switch SW is open is set according to the desired insulation resistance of the object to be measured. For example, when the insulation resistance value Ro of the three-phase motor device 30 is approximately 100 M ⁇ , the switch SW has a resistance value of 100 M ⁇ or more, preferably 1000 M ⁇ or more when in the open state.
- the current measuring device 41 measures the leakage current flowing between the two nodes insulated from each other of the three-phase motor device 30 due to the voltage supplied by the voltage source E1 when the switch SW is turned on, the example of FIG. Then, the leakage current flowing through the ground insulation resistance 35 between the node N4 and the housing 34 is measured.
- the current measuring device 41 includes an operational amplifier or the like, and is configured to measure a current on the order of several ⁇ A to several tens of ⁇ A, for example.
- the insulation resistance calculator 42 calculates the insulation resistance value Ro of the three-phase motor device 30 based on the voltage supplied by the voltage source E1 and the leakage current measured by the current measuring device 41.
- the insulation resistance calculator 42 may determine whether the insulation resistance value Ro satisfies legal requirements.
- the insulation resistance calculator 42 outputs the calculation result and judgment result to the display device 43 .
- the display device 43 displays the insulation resistance value Ro of the three-phase motor device 30. In addition to or instead of the insulation resistance value Ro, the display device 43 may display whether or not the insulation resistance value Ro satisfies legal requirements.
- the operation information receiving unit 44 receives information indicating that the three-phase motor device 30 is operating or stopped from the operation sensor 24 and notifies the controller 46 of the information.
- the humidity information receiving unit 45 receives the humidity in the vicinity of the three-phase motor device 30 from the humidity sensor 36 and notifies the controller 46 of it.
- the controller 46 controls the insulation resistance value Ro is calculated and output via the display device 43, the insulation resistance calculator 42 is controlled.
- the threshold Th1 is set to, for example, 50% so that the insulation resistance value Ro of the three-phase motor device 30 is sufficiently small.
- the user when measuring the insulation resistance value Ro of the three-phase motor device 30 using an insulation resistance measuring instrument other than the insulation resistance monitoring device 40 for legal inspection, the user turns off the circuit breaker 20 and the switch SW. Then, the probe of the insulation resistance measuring instrument is connected to two mutually insulated nodes of the three-phase motor device 30 (for example, the node N4 and the housing 34). Thereby, the insulation resistance value Ro of the three-phase motor device 30 can be measured using the insulation resistance measuring device without removing the insulation resistance monitoring device 40 from the three-phase motor device 30 .
- FIG. 3 is an exemplary timing chart showing measurement of the insulation resistance value Ro of the three-phase motor device 30 by the insulation resistance monitoring device 40 of FIG.
- the three-phase motor device 30 is running during time periods t1-t2 and t3-t4 and is stopped during other time periods. Further, when the three-phase motor device 30 is stopped, the humidity in the vicinity of the three-phase motor device 30 increases beyond the threshold value Th1 at times t11 and t12.
- the insulation resistance monitoring device 40 detects whether the three-phase motor device 30 The insulation resistance value Ro is measured and output.
- FIG. 4 is a flowchart showing an example of insulation resistance monitoring processing executed by the controller 46 of FIG.
- step S1 the controller 46 determines whether or not the three-phase motor device 30 is stopped based on the information from the operation information receiving section 44. If YES, the process proceeds to step S2, and if NO, the process proceeds to step S2. Repeat S1.
- step S2 the controller 46 acquires the humidity H in the vicinity of the three-phase motor device 30 from the humidity information receiving section 45.
- step S3 the controller 46 determines whether or not the humidity H in the vicinity of the three-phase motor device 30 is equal to or greater than the threshold value Th1. If YES, the process proceeds to step S4, and if NO, the process returns to step S1. .
- step S4 the controller 46 controls the insulation resistance calculator 42 to measure the insulation resistance value Ro and output it via the display device 43.
- the insulation resistance value Ro of the three-phase motor device 30 can be adjusted with high accuracy in consideration of the variation of the insulation resistance value Ro caused by the humidity variation in the vicinity of the three-phase motor device 30. It can be measured and presented to the user.
- the insulation resistance value of the three-phase motor device 30 is Ro can be measured with high accuracy and presented to the user.
- FIG. 5 is a block diagram showing an example of the configuration of a motor system including an insulation resistance monitoring device 40A according to the second embodiment.
- the motor system of FIG. 5 includes a three-phase motor device 30A and an insulation resistance monitoring device 40A instead of the three-phase motor device 30 and insulation resistance monitoring device 40 of FIG.
- the three-phase motor device 30A includes, in addition to each component of the three-phase motor device 30 of FIG. 1, a temperature sensor 37 that detects the temperature in the vicinity of the three-phase motor device 30A.
- the “neighborhood” of the three-phase motor device 30A includes a position where the temperature affecting the insulation resistance value Ro of the three-phase motor device 30A can be detected, for example, the inside of the housing 34 .
- the insulation resistance monitoring device 40A includes a controller 46A instead of the controller 46 of the insulation resistance monitoring device 40 of FIG.
- the temperature information receiving unit 47 receives the temperature near the three-phase motor device 30A from the temperature sensor 37 and notifies it to the controller 46A.
- the controller 46A determines that the three-phase motor device 30A is stopped, the humidity in the vicinity of the three-phase motor device 30A is equal to or higher than the first threshold value Th1, and the temperature in the vicinity of the three-phase motor device 30A is predetermined.
- the insulation resistance calculator 42 is controlled so that the insulation resistance value Ro of the three-phase motor device 30A is calculated and output via the display device 43 when the value is equal to or greater than the second threshold value Th2.
- the threshold Th2 is set to 25° C., for example, so that the insulation resistance value Ro of the three-phase motor device 30A is sufficiently small.
- FIG. 6 is an exemplary timing chart showing measurement of the insulation resistance value Ro of the three-phase motor device 30A by the insulation resistance monitoring device 40A of FIG.
- the humidity and temperature in the vicinity of the three-phase motor device 30A become higher than the thresholds Th1 and Th2 at times t21 and t22, respectively.
- the insulation resistance monitoring device 40A detects that the three-phase motor device 30A is stopped, the humidity in the vicinity of the three-phase motor device 30A is equal to or higher than the threshold value Th1, and the humidity in the vicinity of the three-phase motor device 30A is is equal to or higher than the threshold value Th2, the insulation resistance value Ro of the three-phase motor device 30A is measured and output.
- FIG. 7 is a flowchart showing an example of insulation resistance monitoring processing executed by the controller 46A of FIG.
- Steps S11-13 are the same as steps S1-S3 in FIG.
- step S14 the controller 46A acquires the temperature T in the vicinity of the three-phase motor device 30A from the temperature information receiving section 47.
- step S15 the controller 46A determines whether or not the temperature T in the vicinity of the three-phase motor device 30A is equal to or higher than the threshold value Th2. If YES, the process proceeds to step S16, and if NO, the process returns to step S11. .
- step S16 the controller 46A controls the insulation resistance calculator 42 to measure the insulation resistance value Ro and output it via the display device 43, as in step S4 of FIG.
- the insulation resistance value Ro of the three-phase motor device 30A is increased in consideration of the fluctuation of the insulation resistance value Ro due to the humidity and temperature fluctuations in the vicinity of the three-phase motor device 30A. It can be measured with accuracy and presented to the user.
- the insulation resistance of the three-phase motor device 30A is considered in consideration of the fluctuations in the insulation resistance value Ro due to the humidity and temperature fluctuations in the vicinity of the three-phase motor device 30A.
- the resistance value Ro can be measured with high accuracy and presented to the user.
- the insulation resistance value Ro of the three-phase motor device 30A can be measured with higher accuracy than in the first embodiment and presented to the user.
- FIG. 8 is a block diagram showing an example of the configuration of a motor system including an insulation resistance monitoring device 40B according to the third embodiment.
- the motor system of FIG. 8 includes an insulation resistance monitoring device 40B instead of the insulation resistance monitoring device 40A of FIG.
- the insulation resistance monitoring device 40B includes a controller 46B in place of the controller 46A of the insulation resistance monitoring device 40A of FIG.
- the timer 48 counts the elapsed time since the three-phase motor device 30A stopped.
- the controller 46B starts or stops clocking by the timer 48 based on the information from the operation information receiving section 44.
- the controller 46B starts the timer 48 to count time.
- the controller 46B stops timing by the timer 48 and resets it.
- the controller 46B determines that the three-phase motor device 30A is stopped, a predetermined time period T0 has passed since the three-phase motor device 30A stopped, and the humidity in the vicinity of the three-phase motor device 30A has reached the threshold value Th1.
- the insulation resistance calculator 42 is controlled to measure and output the insulation resistance value Ro of the three-phase motor device 30A. do.
- the time period T0 is set, for example, from several minutes to several hours so that the temperature in the vicinity of the three-phase motor device 30A, which rises during operation of the three-phase motor device 30A, is sufficiently lowered.
- the three-phase motor device 30A generates heat during operation, so the temperature in the vicinity of the three-phase motor device 30A rises during operation of the three-phase motor device 30A, and as the temperature rises, the humidity drops. Therefore, if the insulation resistance value Ro is measured immediately after the three-phase motor device 30A stops, there is a risk that the insulation resistance value Ro will temporarily increase due to the decreased humidity. On the other hand, a sufficiently low insulation resistance value Ro can be obtained by measuring the insulation resistance value Ro after the time period T0 has elapsed since the three-phase motor device 30A stopped.
- FIG. 9 is an exemplary timing chart showing measurement of the insulation resistance value Ro of the three-phase motor device 30 by the insulation resistance monitoring device 40B of FIG.
- the insulation resistance value Ro of the three-phase motor device 30A is neither measured nor output.
- the humidity and temperature in the vicinity of the three-phase motor device 30A become higher than the thresholds Th1 and Th2, respectively, even after the time period T0 has passed (that is, at time t2). Until t32), the insulation resistance value Ro of the three-phase motor device 30A is neither measured nor output.
- FIG. 10 is a flowchart showing an example of insulation resistance monitoring processing executed by the controller 46B of FIG.
- step S21 the controller 46B determines whether or not the three-phase motor device 30A is stopped based on the information from the operation information receiving section 44. If YES, the process proceeds to step S22. Proceed to S23.
- step S22 the controller 46B uses the timer 48 to count the elapsed time Tst after stopping the three-phase motor device 30A.
- step S23 the controller 46B resets the timer 48.
- step S24 the controller 46B determines whether or not the elapsed time Tst after stopping the three-phase motor device 30A has reached a predetermined time period T0 or longer. When , the process returns to step S21.
- Steps S25 to S29 are the same as steps S12 to S16 in FIG.
- the insulation resistance value Ro of the three-phase motor device 30A is prevented from being measured and output when the humidity drops due to heat generation of the three-phase motor device 30A. , the insulation resistance value Ro of the three-phase motor device 30A can be measured with high accuracy and presented to the user.
- FIG. 11 is a block diagram showing an example of the configuration of a motor system including an insulation resistance monitoring device 40C according to the fourth embodiment.
- the motor system of FIG. 11 includes an insulation resistance monitoring device 40C instead of the insulation resistance monitoring device 40B of FIG.
- the insulation resistance monitoring device 40C includes a controller 46C and a timer 48C in place of the controller 46B and timer 48 of the insulation resistance monitoring device 40B of FIG.
- the timer 48C counts the elapsed time after starting the threshold value setting process, which will be described later with reference to FIGS.
- the storage device 49 stores the insulation resistance value Ro of the three-phase motor device 30A measured by the insulation resistance measuring device and the vicinity of the three-phase motor device 30A obtained when the insulation resistance value Ro of the three-phase motor device 30A is measured.
- store the humidity and temperature of Storage device 49 may store, for example, a table described with reference to FIG.
- the controller 46C controls the insulation resistance measuring instrument to measure the insulation resistance of the object under test over a predetermined time period T1.
- the controller 46C acquires the insulation resistance value Ro of the object under test measured by the insulation resistance measuring instrument, and the humidity and temperature in the vicinity of the object under test obtained when the insulation resistance value Ro of the object under test is measured.
- the controller 46C selects the humidity corresponding to the minimum insulation resistance value Ro among the plurality of insulation resistance values Ro stored in the storage device 49 as the threshold value Th1.
- the controller 46C selects the temperature corresponding to the minimum insulation resistance value Ro among the plurality of insulation resistance values Ro stored in the storage device 49 as the threshold value Th2.
- the time period T1 is set long enough, for example, several days to several weeks, to obtain a sufficient number of combinations of insulation resistance value Ro, humidity, and temperature to set threshold values Th1 and Th2. be.
- FIG. 12 is an exemplary timing chart showing insulation resistance measurement of the three-phase motor device 30A by the insulation resistance monitoring device 40C of FIG.
- the insulation resistance monitoring device 40C measures the insulation resistance value Ro each time the humidity or temperature changes by a predetermined step width while the three-phase motor device 30A is stopped.
- the humidity step width is 10% and the temperature step width is 5°C.
- the insulation resistance monitoring device 40C measures the insulation resistance value Ro from time t41 to t46. Thereby, the insulation resistance monitoring device 40C obtains a plurality of insulation resistance values Ro measured corresponding to different combinations of humidity and temperature.
- FIG. 13 is a table showing the insulation resistance value Ro of the three-phase motor device 30A measured under various humidity and temperature conditions by the insulation resistance monitoring device 40C of FIG.
- the insulation resistance monitoring device 40C measures the insulation resistance value Ro every time the combination of humidity and temperature reaches a value corresponding to the unmeasured insulation resistance value Ro, and It is stored in the storage device 49 in association with the temperature. After a predetermined period of time, eg, three days, the data shown in FIG. In FIG. 13, the unit of the insulation resistance value Ro is M ⁇ , and a blank indicates that the insulation resistance value Ro is not measured.
- the minimum value of the insulation resistance value Ro is 100 M ⁇ , correspondingly the humidity threshold Th1 is set to 50% and the temperature threshold Th2 is set to 25°C. .
- FIG. 14 is a flowchart showing an example of insulation resistance monitoring processing executed by the controller 46C of FIG.
- step S31 the controller 46C determines whether or not the thresholds Th1 and Th2 have not been set. If YES, the process proceeds to step S32, and if NO, the process proceeds to step S33.
- step S32 the controller 46C executes threshold value setting processing, which will be described later with reference to FIG.
- step S33 the controller 46C executes insulation resistance measurement processing.
- the insulation resistance measuring process in step S33 is the same as the insulation resistance monitoring process described with reference to FIG. 4, FIG. 7, or FIG.
- FIG. 15 is a flow chart showing the subroutine of the threshold value setting process in step S32 of FIG.
- step S41 the controller 46C determines whether or not the three-phase motor device 30A is stopped based on the information from the operation information receiving section 44. If YES, the process proceeds to step S42. S41 is repeated.
- step S42 the controller 46C acquires the humidity H near the three-phase motor device 30A from the humidity information receiving section 45 and the temperature T near the three-phase motor device 30A from the temperature information receiving section 47.
- step S43 the controller 46C determines whether or not the insulation resistance value Ro corresponding to the current humidity H and temperature T has not yet been measured. return.
- step S44 the controller 46C controls the insulation resistance calculator 42 to measure the insulation resistance value Ro.
- step S45 the controller 46C stores the insulation resistance value Ro together with the humidity H and the temperature T in the storage device 49.
- step S46C the controller 46C determines whether or not a predetermined measurement period T1 has elapsed since the start of the threshold value setting process. back to
- step S47 the controller 46C sets the humidity H corresponding to the minimum insulation resistance value Ro as the threshold value Th1.
- step S48 the controller 46C sets the temperature T corresponding to the minimum insulation resistance value Ro as the threshold value Th2.
- Step S32 is executed, for example, when the insulation resistance monitoring device 40C is first operated after installing the motor system. After executing step S32, the insulation resistance measurement process of step S33 can be executed using the set threshold values Th1 and Th2.
- the minimum humidity among the plurality of humidity values corresponding to these insulation resistance values may be selected as the threshold value Th1, and these insulation resistance values
- the minimum temperature may be selected as the threshold value Th2 from among the plurality of temperatures corresponding to .
- the humidity threshold value Th1 and the temperature threshold value are set appropriately according to the environment around the three-phase motor device 30A.
- the value Th2 can be automatically set, and the insulation resistance value Ro of the three-phase motor device 30A can be measured with high accuracy. Further, by automatically setting the threshold values Th1 and Th2, the user's trouble can be reduced.
- the three-phase The humidity and temperature in the vicinity of the motor device 30A may be difficult to reach the threshold values Th1 and Th2.
- the threshold values Th1 and Th2 are reset as described with reference to FIG.
- FIG. 16 is a flow chart showing a modification of the insulation resistance monitoring process executed by the controller 46C of FIG.
- step S51 the controller 46C determines whether or not the period during which the insulation resistance value Ro is not measured exceeds the threshold value T2. If YES, the process proceeds to step S52, and if NO, the process proceeds to step S53.
- the threshold T2 is set to one week, for example.
- step S52 the controller 46C executes threshold value resetting processing.
- the threshold resetting process in step S52 is the same as the threshold setting process in step S32.
- step S53 the controller 46C executes insulation resistance measurement processing. 4, 7, or 10 except that the insulation resistance measurement process in step S53 proceeds to step 51 in FIG. 16 instead of returning to the first step in the insulation resistance monitoring process in FIG. , or similar to the insulation resistance monitoring process described with reference to FIG.
- the insulation resistance value Ro of the three-phase motor device 30A can be adjusted by resetting the threshold values Th1 and Th2. It is possible to prevent the measurement from becoming impossible for a long period of time.
- the humidity sensor 36 may be provided inside the housing 34 as shown in FIG. , may be provided outside the housing 34 .
- the temperature sensor 37 may be provided inside the housing 34 as shown in FIG. For example, it may be provided outside the housing 34 .
- the operation information receiving unit 44 receives information indicating that the three-phase motor devices 30, 30A are in operation or stopped from the operation sensor 24 provided in the circuit breaker 20, as shown in FIG. 1 and others. Alternatively, the information may be received from another controller (not shown) that controls the circuit breaker 20 . Also, as shown in FIG. 1 and others, the humidity information receiving unit 45 may receive the humidity in the vicinity of the three-phase motor devices 30 and 30A from the humidity sensor 36 provided in the three-phase motor devices 30 and 30A. Alternatively, the humidity may be received from another measuring device that measures the humidity in the vicinity of the three-phase motor devices 30, 30A.
- the temperature information receiving unit 47 may receive the temperature in the vicinity of the three-phase motor device 30A from the temperature sensor 37 provided in the three-phase motor device 30A, as shown in FIG. The temperature may be received from another measuring device that measures the temperature in the vicinity of the three-phase motor device 30A.
- the insulation resistance monitoring devices 40 and 40A to 40C monitor the three-phase motor devices.
- the insulation resistance value Ro of 30 and 30A may be measured and output.
- the insulation resistance monitoring devices 40A to 40C detect that the three-phase motor device 30A is stopped, the humidity in the vicinity of the three-phase motor device 30A is within a predetermined range, and the temperature in the vicinity of the three-phase motor device 30A is is within a predetermined range, the insulation resistance value Ro of the three-phase motor device 30A may be measured and output.
- the minimum value of the insulation resistance value Ro is 100 M ⁇ , so correspondingly the humidity range is set to 50-56% and the temperature range is set to 25-29°C.
- the humidity range is set to 50-56% and the temperature range is set to 25-29°C.
- the appropriate humidity range and temperature range can be automatically reset according to the surrounding environment of the three-phase motor device 30A. As a result, it is possible to prevent the insulation resistance value Ro of the three-phase motor device 30A from being unable to be measured over a long period of time.
- the insulation resistance monitoring device 40B acquires both the humidity and temperature in the vicinity of the three-phase motor device 30A has been described, but only one of the humidity and temperature may be acquired.
- the insulation resistance monitoring device 40B detects that the three-phase motor device 30A is stopped, a predetermined time period T0 has passed since the three-phase motor device 30A stopped, and the insulation resistance monitoring device 40B When the humidity or temperature is equal to or higher than the threshold value, the insulation resistance value Ro of the three-phase motor device 30A is measured and output.
- the insulation resistance monitoring device 40C automatically sets both the humidity threshold value Th1 and the temperature threshold value Th2. It may be set automatically.
- the other insulation resistance monitoring devices 40, 40A to 40C in FIG. An insulation resistance calculator having the configuration of
- the display device 43 may be provided in a remote device connected via a communication line instead of inside the insulation resistance monitoring devices 40, 40A to 40C.
- the calculation results and judgment results of the insulation resistance calculator 42 may be audibly output using an audio output device. Also, any other output device may be used to notify the user of the calculation results and judgment results of the insulation resistance calculator 42 . Moreover, the insulation resistance monitoring devices 40, 40A to 40C may output the calculation results and judgment results of the insulation resistance calculator 42 to other devices connected via a communication line.
- the insulation resistance monitoring devices 40, 40A to 40C are connected to the node N4 of the three-phase motor device 30, 30A and the housing 34, but the insulation resistance monitoring devices 40, 40A to 40C , may be connected between the node N5 and the housing 34, and may be connected between the node N6 and the housing 34.
- the insulation resistance monitoring devices 40, 40A to 40C may be connected between two mutually insulated nodes of any other device under test instead of the three-phase motor devices 30, 30A.
- DUTs include, for example, power supplies, timers, relays, common sockets, DIN rails, waterproof covers, temperature controllers, and switches.
- the insulation resistance monitoring device 40 may be connected not only to the power supply line and the ground conductor of the device under test but also to any two mutually insulated nodes of the device under test.
- the insulation resistance monitoring device 40 includes an insulation resistance measuring instrument, an operation information receiver 44, a humidity information receiver 45, and a controller 46.
- the insulation resistance measuring instrument measures and outputs the insulation resistance of the object to be measured.
- the motion information receiving section 44 receives information indicating that the device under test is in motion or stopped.
- the humidity information receiving section 45 receives the humidity in the vicinity of the object to be measured.
- the controller 46 measures and outputs the insulation resistance of the object to be measured when the object to be measured is stopped and the humidity in the vicinity of the object to be measured is equal to or higher than the first threshold value Th1. Control the resistance meter.
- the insulation resistance monitoring device 40B further includes a timer that measures elapsed time after the object to be measured has stopped.
- the controller 46B determines that the object to be measured is stopped, a predetermined first time period has elapsed since the object to be measured has stopped, and the humidity in the vicinity of the object to be measured has reached the first threshold value.
- Th1 or more the insulation resistance measuring instrument is controlled to measure and output the insulation resistance of the object to be measured.
- the insulation resistance monitoring device 40C further includes a storage device 49 that stores the insulation resistance of the object under test measured by the insulation resistance measuring instrument.
- the controller 46C controls the insulation resistance measuring device to measure the insulation resistance of the object under test over a predetermined second time period, and the insulation resistance of the object under test measured by the insulation resistance measuring device storing the humidity in the vicinity of the object under test received when the insulation resistance of the object under test is measured;
- the first threshold Th1 is set by selecting the humidity corresponding to as the first threshold Th1.
- the controller 46C sets the third time period in which the humidity in the vicinity of the object to be measured is less than the first threshold value Th1 is predetermined. When exceeded, a first threshold Th1 is set.
- the insulation resistance monitoring device 40A further includes a temperature information receiving section that receives the temperature in the vicinity of the object to be measured.
- the controller 46A determines that the object to be measured is stopped, the humidity in the vicinity of the object to be measured is equal to or higher than the first threshold value Th1, and the temperature in the vicinity of the object to be measured is equal to or higher than the second threshold value Th2. , the insulation resistance measuring instrument is controlled to measure and output the insulation resistance of the object under test.
- the insulation resistance monitoring device 40B further includes a timer that measures elapsed time after the object to be measured has stopped.
- the controller 46B determines that the object to be measured is stopped, a predetermined first time period has elapsed since the object to be measured has stopped, and the humidity in the vicinity of the object to be measured is equal to or greater than the first threshold value Th1. and the temperature in the vicinity of the object to be measured is equal to or higher than the second threshold value Th2, the insulation resistance measuring instrument is controlled to measure and output the insulation resistance of the object to be measured.
- the insulation resistance monitoring device 40C further includes a storage device 49 that stores the insulation resistance of the object under test measured by the insulation resistance measuring instrument.
- the controller 46C controls the insulation resistance measuring device to measure the insulation resistance of the object under test over a predetermined second time period, and the insulation resistance of the object under test measured by the insulation resistance measuring device storing the temperature in the vicinity of the object under test received when the insulation resistance of the object under test is measured in the storage device 49;
- the second threshold Th2 is set by selecting the temperature corresponding to as the second threshold Th2.
- the controller 46C sets the third time period in which the temperature in the vicinity of the object to be measured is less than the second threshold value Th2 is predetermined. When exceeded, a second threshold Th2 is set.
- the insulation resistance monitoring device it is possible to measure the insulation resistance of the object to be measured with high accuracy, taking into consideration the variation in the insulation resistance of the object to be measured due to the surrounding environment.
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- General Physics & Mathematics (AREA)
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Abstract
Description
被測定物の絶縁抵抗を測定して出力する絶縁抵抗測定器と、
前記被測定物が動作中又は停止中であることを示す情報を受信する動作情報受信部と、
前記被測定物の近傍の湿度を受信する湿度情報受信部と、
前記被測定物が停止中であり、かつ、前記被測定物の近傍の湿度が第1のしきい値以上であるとき、前記被測定物の絶縁抵抗を測定して出力するように前記絶縁抵抗測定器を制御するコントローラとを備える。
前記絶縁抵抗監視装置は、前記被測定物が停止してからの経過時間を計時するタイマをさらに備え、
前記コントローラは、前記被測定物が停止中であり、前記被測定物が停止してから予め決められた第1の時間期間が経過し、かつ、前記被測定物の近傍の湿度が前記第1のしきい値以上であるとき、前記被測定物の絶縁抵抗を測定して出力するように前記絶縁抵抗測定器を制御する。
前記絶縁抵抗監視装置は、前記絶縁抵抗測定器によって測定された前記被測定物の絶縁抵抗を格納する記憶装置をさらに備え、
前記コントローラは、
予め決められた第2の時間期間にわたって前記被測定物の絶縁抵抗を測定するように前記絶縁抵抗測定器を制御することと、
前記絶縁抵抗測定器によって測定された前記被測定物の絶縁抵抗とともに、前記被測定物の絶縁抵抗を測定したときに受信された前記被測定物の近傍の湿度を前記記憶装置に格納することと、
前記記憶装置に格納された複数の絶縁抵抗のうちで最小の絶縁抵抗に対応する湿度を前記第1のしきい値として選択することとにより、
前記第1のしきい値を設定する。
前記コントローラは、前記被測定物の近傍の湿度が前記第1のしきい値に満たない期間が予め決められた第3の時間期間を超えたとき、前記第1のしきい値を設定する。
前記絶縁抵抗監視装置は、前記被測定物の近傍の温度を受信する温度情報受信部をさらに備え、
前記コントローラは、前記被測定物が停止中であり、前記被測定物の近傍の湿度が前記第1のしきい値以上であり、かつ、前記被測定物の近傍の温度が第2のしきい値以上であるとき、前記被測定物の絶縁抵抗を測定して出力するように前記絶縁抵抗測定器を制御する。
前記絶縁抵抗監視装置は、前記被測定物が停止してからの経過時間を計時するタイマをさらに備え、
前記コントローラは、前記被測定物が停止中であり、前記被測定物が停止してから予め決められた第1の時間期間が経過し、前記被測定物の近傍の湿度が前記第1のしきい値以上であり、かつ、前記被測定物の近傍の温度が前記第2のしきい値以上であるとき、前記被測定物の絶縁抵抗を測定して出力するように前記絶縁抵抗測定器を制御する。
前記絶縁抵抗監視装置は、前記絶縁抵抗測定器によって測定された前記被測定物の絶縁抵抗を格納する記憶装置をさらに備え、
前記コントローラは、
予め決められた第2の時間期間にわたって前記被測定物の絶縁抵抗を測定するように前記絶縁抵抗測定器を制御することと、
前記絶縁抵抗測定器によって測定された前記被測定物の絶縁抵抗とともに、前記被測定物の絶縁抵抗を測定したときに受信された前記被測定物の近傍の温度を前記記憶装置に格納することと、
前記記憶装置に格納された複数の絶縁抵抗のうちで最小の絶縁抵抗に対応する温度を前記第2のしきい値として選択することとにより、
前記第2のしきい値を設定する。
前記コントローラは、前記被測定物の近傍の温度が前記第2のしきい値に満たない期間が予め決められた第3の時間期間を超えたとき、前記第2のしきい値を設定する。
図1は、第1の実施形態に係る絶縁抵抗監視装置40を含むモータシステムの構成の一例を示すブロック図である。図1のモータシステムは、例えば、三相交流電源装置10、回路遮断器20、三相モータ装置30、及び絶縁抵抗監視装置40を備える。三相交流電源装置10は、回路遮断器20を介して三相モータ装置30に三相交流電力を供給する。図1の例では、絶縁抵抗監視装置40が、その被測定物として、三相モータ装置30の絶縁抵抗値Roを測定する場合を示す。
以下、第1の実施形態に係る絶縁抵抗監視装置についてさらに説明する。
三相交流電源装置10は、3つの単相交流電源11~13を備える。単相交流電源11~13は、120度ずつ互いに異なる位相を有する単相交流電圧を発生する。図1の例では、単相交流電源11~13はΔ結線で互いに接続される。単相交流電源11~13を互いに接続するノードN1~N3は、U相、V相、及びW相の各電源ラインを介して回路遮断器20及び三相モータ装置30に接続される。
図3は、図1の絶縁抵抗監視装置40による三相モータ装置30の絶縁抵抗値Roの測定を示す例示的なタイミングチャートである。図3の例では、三相モータ装置30は、時間期間t1~t2及びt3~t4において動作中であり、他の時間期間において停止中である。また、三相モータ装置30が停止中であるとき、時刻t11及びt12において、三相モータ装置30の近傍の湿度は、しきい値Th1を超えて増大する。前述したように、絶縁抵抗監視装置40は、三相モータ装置30が停止中であり、かつ、三相モータ装置30の近傍の湿度がしきい値Th1以上であるとき、三相モータ装置30の絶縁抵抗値Roを測定して出力する。
第1の実施形態に係る絶縁抵抗監視装置40によれば、三相モータ装置30の近傍の湿度の変動に起因する絶縁抵抗値Roの変動を考慮して、三相モータ装置30の絶縁抵抗値Roを高精度に測定してユーザに提示することができる。
次に、第2の実施形態に係る絶縁抵抗監視装置について説明する。
図5は、第2の実施形態に係る絶縁抵抗監視装置40Aを含むモータシステムの構成の一例を示すブロック図である。図5のモータシステムは、図1の三相モータ装置30及び絶縁抵抗監視装置40に代えて、三相モータ装置30A及び絶縁抵抗監視装置40Aを備える。
図6は、図5の絶縁抵抗監視装置40Aによる三相モータ装置30Aの絶縁抵抗値Roの測定を示す例示的なタイミングチャートである。図3の例では、三相モータ装置30Aが停止中であるとき、時刻t21及びt22において、三相モータ装置30Aの近傍の湿度及び温度はそれぞれしきい値Th1,Th2より高くなる。前述したように、絶縁抵抗監視装置40Aは、三相モータ装置30Aが停止中であり、三相モータ装置30Aの近傍の湿度がしきい値Th1以上であり、かつ、三相モータ装置30Aの近傍の温度がしきい値Th2以上であるとき、三相モータ装置30Aの絶縁抵抗値Roを測定して出力する。
第2の実施形態に係る絶縁抵抗監視装置40Aによれば、三相モータ装置30Aの近傍の湿度及び温度の変動に起因する絶縁抵抗値Roの変動を考慮して、三相モータ装置30Aの絶縁抵抗値Roを高精度に測定してユーザに提示することができる。湿度及び温度の両方を考慮することにより、三相モータ装置30Aの絶縁抵抗値Roを第1の実施形態の場合よりも高精度に測定してユーザに提示することができる。
次に、第3の実施形態に係る絶縁抵抗監視装置について説明する。
図8は、第3の実施形態に係る絶縁抵抗監視装置40Bを含むモータシステムの構成の一例を示すブロック図である。図8のモータシステムは、図5の絶縁抵抗監視装置40Aに代えて、絶縁抵抗監視装置40Bを備える。
図9は、図8の絶縁抵抗監視装置40Bによる三相モータ装置30の絶縁抵抗値Roの測定を示す例示的なタイミングチャートである。図9の例では、時刻t2において三相モータ装置30Aが停止した後で、三相モータ装置30Aの近傍の湿度及び温度がそれぞれしきい値Th1,Th2より高くなっても、時間期間T0が経過する(すなわち時刻t31)までは、三相モータ装置30Aの絶縁抵抗値Roの測定及び出力を行わない。また、時刻t2において三相モータ装置30Aが停止した後で、時間期間T0が経過しても、三相モータ装置30Aの近傍の湿度及び温度はそれぞれしきい値Th1,Th2より高くなる(すなわち時刻t32)までは、三相モータ装置30Aの絶縁抵抗値Roの測定及び出力を行わない。
第3の実施形態に係る絶縁抵抗監視装置40Bによれば、三相モータ装置30Aの発熱に起因して湿度が低下したときに三相モータ装置30Aの絶縁抵抗値Roを測定及び出力することを回避し、これにより、三相モータ装置30Aの絶縁抵抗値Roを高精度に測定してユーザに提示することができる。
次に、第4の実施形態に係る絶縁抵抗監視装置について説明する。
図11は、第4の実施形態に係る絶縁抵抗監視装置40Cを含むモータシステムの構成の一例を示すブロック図である。図11のモータシステムは、図8の絶縁抵抗監視装置40Bに代えて、絶縁抵抗監視装置40Cを備える。
図12は、図11の絶縁抵抗監視装置40Cによる三相モータ装置30Aの絶縁抵抗の測定を示す例示的なタイミングチャートである。絶縁抵抗監視装置40Cは、三相モータ装置30Aが停止中であるとき、湿度又は温度が所定のステップ幅で変化するごとに絶縁抵抗値Roを測定する。図12の例では、湿度のステップ幅は10%であり、温度のステップ幅は5℃である。図12の例では、絶縁抵抗監視装置40Cは、時刻t41~t46において絶縁抵抗値Roを測定する。これにより、絶縁抵抗監視装置40Cは、湿度及び温度の異なる組み合わせに対応して測定された複数の絶縁抵抗値Roを取得する。
第4の実施形態に係る絶縁抵抗監視装置40Cによれば、図14の絶縁抵抗監視処理を実行することにより、三相モータ装置30Aの周囲の環境に応じて適切な湿度のしきい値Th1及び温度のしきい値Th2を自動的に設定することができ、三相モータ装置30Aの絶縁抵抗値Roを高精度に測定することができる。また、第4の実施形態に係る絶縁抵抗監視装置40Cによれば、図16の絶縁抵抗監視処理を実行することにより、三相モータ装置30Aの周囲の環境に応じて適切な湿度のしきい値Th1及び温度のしきい値Th2を自動的に再設定することができる。これにより、三相モータ装置30Aの周囲の環境が変化しても、三相モータ装置30Aの絶縁抵抗値Roを長期間にわたって測定できなくなることを防ぐことができる。
以上、本開示の実施形態を詳細に説明してきたが、前述までの説明はあらゆる点において本開示の例示に過ぎない。本開示の範囲を逸脱することなく種々の改良や変形を行うことができることは言うまでもない。例えば、以下のような変更が可能である。なお、以下では、上記実施形態と同様の構成要素に関しては同様の符号を用い、上記実施形態と同様の点については、適宜説明を省略した。以下の変形例は適宜組み合わせ可能である。
本開示の各側面に係る絶縁抵抗監視装置は、以下のように表現されてもよい。
11~13 単相交流電源
20 回路遮断器
21~23 スイッチ
24 動作センサ
30,30A 三相モータ装置
31~33 巻線
34 筐体
35 対地絶縁抵抗
36 湿度センサ
37 温度センサ
40,40A~40C 絶縁抵抗監視装置
41 電流測定器
42 絶縁抵抗計算器
43 表示装置
44 動作情報受信部
45 湿度情報受信部
46,46A~46C コントローラ
47 温度情報受信部
48,48C タイマ
49 記憶装置
E1 電圧源
SW スイッチ
Claims (8)
- 被測定物の絶縁抵抗を測定して出力する絶縁抵抗測定器と、
前記被測定物が動作中又は停止中であることを示す情報を受信する動作情報受信部と、
前記被測定物の近傍の湿度を受信する湿度情報受信部と、
前記被測定物が停止中であり、かつ、前記被測定物の近傍の湿度が第1のしきい値以上であるとき、前記被測定物の絶縁抵抗を測定して出力するように前記絶縁抵抗測定器を制御するコントローラとを備える、
絶縁抵抗監視装置。 - 前記絶縁抵抗監視装置は、前記被測定物が停止してからの経過時間を計時するタイマをさらに備え、
前記コントローラは、前記被測定物が停止中であり、前記被測定物が停止してから予め決められた第1の時間期間が経過し、かつ、前記被測定物の近傍の湿度が前記第1のしきい値以上であるとき、前記被測定物の絶縁抵抗を測定して出力するように前記絶縁抵抗測定器を制御する、
請求項1記載の絶縁抵抗監視装置。 - 前記絶縁抵抗監視装置は、前記絶縁抵抗測定器によって測定された前記被測定物の絶縁抵抗を格納する記憶装置をさらに備え、
前記コントローラは、
予め決められた第2の時間期間にわたって前記被測定物の絶縁抵抗を測定するように前記絶縁抵抗測定器を制御することと、
前記絶縁抵抗測定器によって測定された前記被測定物の絶縁抵抗とともに、前記被測定物の絶縁抵抗を測定したときに受信された前記被測定物の近傍の湿度を前記記憶装置に格納することと、
前記記憶装置に格納された複数の絶縁抵抗のうちで最小の絶縁抵抗に対応する湿度を前記第1のしきい値として選択することとにより、
前記第1のしきい値を設定する、
請求項1又は2記載の絶縁抵抗監視装置。 - 前記コントローラは、前記被測定物の近傍の湿度が前記第1のしきい値に満たない期間が予め決められた第3の時間期間を超えたとき、前記第1のしきい値を設定する、
請求項3記載の絶縁抵抗監視装置。 - 前記絶縁抵抗監視装置は、前記被測定物の近傍の温度を受信する温度情報受信部をさらに備え、
前記コントローラは、前記被測定物が停止中であり、前記被測定物の近傍の湿度が前記第1のしきい値以上であり、かつ、前記被測定物の近傍の温度が第2のしきい値以上であるとき、前記被測定物の絶縁抵抗を測定して出力するように前記絶縁抵抗測定器を制御する、
請求項1~4のうちの1つに記載の絶縁抵抗監視装置。 - 前記絶縁抵抗監視装置は、前記被測定物が停止してからの経過時間を計時するタイマをさらに備え、
前記コントローラは、前記被測定物が停止中であり、前記被測定物が停止してから予め決められた第1の時間期間が経過し、前記被測定物の近傍の湿度が前記第1のしきい値以上であり、かつ、前記被測定物の近傍の温度が前記第2のしきい値以上であるとき、前記被測定物の絶縁抵抗を測定して出力するように前記絶縁抵抗測定器を制御する、
請求項5記載の絶縁抵抗監視装置。 - 前記絶縁抵抗監視装置は、前記絶縁抵抗測定器によって測定された前記被測定物の絶縁抵抗を格納する記憶装置をさらに備え、
前記コントローラは、
予め決められた第2の時間期間にわたって前記被測定物の絶縁抵抗を測定するように前記絶縁抵抗測定器を制御することと、
前記絶縁抵抗測定器によって測定された前記被測定物の絶縁抵抗とともに、前記被測定物の絶縁抵抗を測定したときに受信された前記被測定物の近傍の温度を前記記憶装置に格納することと、
前記記憶装置に格納された複数の絶縁抵抗のうちで最小の絶縁抵抗に対応する温度を前記第2のしきい値として選択することとにより、
前記第2のしきい値を設定する、
請求項5又は6記載の絶縁抵抗監視装置。 - 前記コントローラは、前記被測定物の近傍の温度が前記第2のしきい値に満たない期間が予め決められた第3の時間期間を超えたとき、前記第2のしきい値を設定する、
請求項7記載の絶縁抵抗監視装置。
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JPH07294571A (ja) * | 1994-04-27 | 1995-11-10 | N T T Advance Technol Kk | ケーブル絶縁抵抗測定法および測定装置 |
JPH10257670A (ja) * | 1997-03-10 | 1998-09-25 | Toshiba Fa Syst Eng Kk | 電動機制御装置及び電動機の保守管理システム |
JP2007159289A (ja) * | 2005-12-06 | 2007-06-21 | Fanuc Ltd | モータ駆動装置 |
JP2009264989A (ja) * | 2008-04-28 | 2009-11-12 | Hitachi Ltd | 制御装置 |
JP2020148736A (ja) | 2019-03-15 | 2020-09-17 | オムロン株式会社 | 絶縁抵抗監視装置 |
CN212364475U (zh) * | 2020-03-31 | 2021-01-15 | 国网天津市电力公司电力科学研究院 | 一种自动高效凝露绝缘试验装置 |
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JPH07294571A (ja) * | 1994-04-27 | 1995-11-10 | N T T Advance Technol Kk | ケーブル絶縁抵抗測定法および測定装置 |
JPH10257670A (ja) * | 1997-03-10 | 1998-09-25 | Toshiba Fa Syst Eng Kk | 電動機制御装置及び電動機の保守管理システム |
JP2007159289A (ja) * | 2005-12-06 | 2007-06-21 | Fanuc Ltd | モータ駆動装置 |
JP2009264989A (ja) * | 2008-04-28 | 2009-11-12 | Hitachi Ltd | 制御装置 |
JP2020148736A (ja) | 2019-03-15 | 2020-09-17 | オムロン株式会社 | 絶縁抵抗監視装置 |
CN212364475U (zh) * | 2020-03-31 | 2021-01-15 | 国网天津市电力公司电力科学研究院 | 一种自动高效凝露绝缘试验装置 |
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