WO2016067493A1 - 負荷試験装置 - Google Patents
負荷試験装置 Download PDFInfo
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- WO2016067493A1 WO2016067493A1 PCT/JP2015/003663 JP2015003663W WO2016067493A1 WO 2016067493 A1 WO2016067493 A1 WO 2016067493A1 JP 2015003663 W JP2015003663 W JP 2015003663W WO 2016067493 A1 WO2016067493 A1 WO 2016067493A1
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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
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
- G01R17/02—Arrangements in which the value to be measured is automatically compared with a reference value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/317—Testing of digital circuits
- G01R31/3181—Functional testing
- G01R31/319—Tester hardware, i.e. output processing circuits
- G01R31/3193—Tester hardware, i.e. output processing circuits with comparison between actual response and known fault free response
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
Definitions
- the present invention relates to a load test apparatus.
- Patent Document 1 a device for stopping energization of a resistor when a current flowing through the resistor is abnormal in a load test has been proposed.
- control based on the failure of the resistor is possible, but control based on the failure of the relay used for controlling power supply to the resistor is not considered.
- an object of the present invention is to provide a load test apparatus capable of appropriately detecting an abnormality based on a failure of a relay.
- a load test apparatus includes a resistor group including a relay and a resistor, a resistor unit connected to a test target power source for performing a load test, and a power from the test target power source to the resistor group.
- a selection switch used for selecting whether or not to supply, a voltage applied to the resistance unit, an electrical signal detection unit for detecting at least one of the current flowing in the resistance unit, and a control unit, Corresponding to the on / off state of the selection switch, the relay operates to control the power supply from the power source to be tested to the resistor group including the relay.
- the control unit receives information from the electrical signal detection unit.
- the change in the waveform immediately after the operation of the selection switch is more likely to be caused by a failure (particularly, contact failure) of the relay corresponding to the operated selection switch than a possibility caused by a failure of the resistor.
- detection information including a time-series change in voltage when the selection switch is operated is compared with reference information recorded in advance such as a normal voltage waveform, thereby corresponding to the operated selection switch. It is possible to determine whether the relay is operating normally.
- control unit compares information of at least one of time series change of voltage and current when the selection switch is operated and reference information recorded in advance before performing a load test with detection information. If the power source to be tested is an AC power source, the AC waveform of the power supplied from the power source to be tested to the resistance unit is determined from the reference information and detection information. The sine wave based on is removed and the comparison is made.
- it further includes a warning unit that outputs information of at least one of light and sound at the time of off control, and the control unit operates normally among the relays based on the comparison result at the time of off control. Information about the relay determined to be not is output to the warning unit.
- the power source to be tested is an AC power source
- the electrical signal detector includes a first voltage detector that detects a voltage applied to a U-phase resistor and a V-phase resistor in the resistor, A second voltage detector for detecting a voltage applied to the W-phase resistor in the V-phase resistor and the resistor, and a voltage applied to the W-phase resistor and the U-phase resistor. It has the 3rd voltage detection part to detect, and detection information is the information from a 1st voltage detection part, a 2nd voltage detection part, and a 3rd voltage detection part.
- the relay RS having an abnormality is for the U-phase line, the V-phase line or the W-phase line.
- the power source to be tested is an AC power source
- the electrical signal detection unit includes a first current detection unit that detects a current flowing through a U-phase resistor in the resistance unit, and a V-phase resistance in the resistance unit.
- a second current detection unit that detects a current flowing through the detector
- a third current detection unit that detects a current flowing through the resistor for the W phase in the resistance unit. This is information from the 2 current detector and the third current detector.
- a reference waveform region including a waveform indicating a time-series change of at least one of voltage and current when the selection switch is operated and indicated by a curve having a certain width is compared with detection information as reference information.
- the control unit makes a determination based on the length of the time zone included in the reference waveform region in the waveform indicating the detection information.
- the waveform includes a waveform indicating a time-series change of at least one of voltage and current when the selection switch is operated and the relay operates normally in response to the operation of the selection switch, and is indicated by a curve having a certain width.
- the reference waveform area is compared with the detection information as reference information, and the control unit superimposes the waveform indicating the detection information on the reference waveform area and includes a time zone included in the reference waveform area in the waveform indicating the detection information. When the length of is shorter than the first threshold, off control is performed.
- it further includes a warning unit that outputs information of at least one of light and sound during the off control, and the control unit indicates the detection information when the waveform indicating the detection information is superimposed on the reference waveform region.
- the control unit indicates the detection information when the waveform indicating the detection information is superimposed on the reference waveform region.
- the control unit indicates the detection information when the waveform indicating the detection information is superimposed on the reference waveform region.
- This warning makes it possible to inform the relay replacement time before the load test device cannot operate normally due to a failure.
- the detection information is a time series change of at least one of voltage and current, and is a time from when the selection switch is operated until at least one of the voltage and current becomes a steady state.
- the test target power supply is an AC power supply
- the sine wave based on the AC waveform of the power supplied from the test target power supply to the resistance unit is removed from the reference information and detection information. Time is detection information.
- control unit makes a determination based on detection information at a predetermined time after the selection switch is operated.
- FIG. 4 is a schematic diagram showing a circuit configuration of a resistance unit including a first voltage detection unit to a third voltage detection unit. It is a schematic diagram which shows the structure of an operation part. It is a flowchart which shows the operation
- FIG. 7 is a diagram showing the voltage waveform of FIG. 6 with a sine wave based on power from a test target power supply removed.
- FIG. 8 is a diagram illustrating the voltage waveform in FIG.
- FIG. 7 is a figure which shows the example of what includes the sine wave based on the electric power from a test object power supply in the voltage waveform at the time of normal.
- FIG. 10 is a diagram showing a voltage waveform of FIG. 9 obtained by removing a seaweed from a sine wave based on power from a power source to be tested. It is a schematic diagram which shows the structure of the operation part in the form which provided the display apparatus in the operation part. It is a figure which shows the area
- FIG. 6 is a schematic diagram showing a circuit configuration of a resistance unit including a first current detection unit to a third current detection unit.
- the load test apparatus 1 in the first embodiment includes a cooling fan 10, a resistance unit 20, a housing 30, a main switch 50, an operation unit 60, and a control unit 80, and a load of a power supply device (test target power supply) such as a generator. Used for conducting tests (see FIGS. 1 to 13).
- a power supply device such as a generator. Used for conducting tests (see FIGS. 1 to 13).
- the cooling fan 10 is a device that sends cooling air to the resistance unit 20, and the resistance unit 20 is disposed above the cooling fan 10. In the present embodiment, a mode in which the cooling fan 10 and the resistance unit 20 are vertically stacked will be described.
- the cooling fan 10 is provided with a rotation state detection unit 10a that detects the rotation state of the fan, such as a fiber sensor, a laser sensor, a photoelectric sensor, or a wind pressure sensor.
- a rotation state detection unit 10a that detects the rotation state of the fan, such as a fiber sensor, a laser sensor, a photoelectric sensor, or a wind pressure sensor.
- the rotation state detection unit 10 a detects the rotation speed of the cooling fan 10 and transmits information related to the rotation speed to the control unit 80.
- the resistance unit 20 includes a plurality of bar-shaped resistors extending in the horizontal direction at predetermined intervals, and one or more resistors connected in series or in parallel are provided. Is supplied with power from the power source to be tested to a part or all of the resistor group.
- the resistor is not limited to one composed of heating wires, but may be one that can store electric power inside a battery or the like.
- resistor groups with a rated capacity of 5 kW (first resistor group G1, second resistor group G2) and two resistor groups with 10 kW are used for a load test of a three-phase AC power supply.
- An example is shown in which a total of four resistor groups (third resistor group G3, fourth resistor group G4) are provided.
- Each resistor group includes two resistors (first resistor R 1 and second resistor R 2 ) connected in series for the U phase connected to the R phase terminal of the test target power source, and the test target power source.
- Two resistors (third resistor R 3 and fourth resistor R 4 ) connected in series for the V phase connected to the S phase terminal of W, and for the W phase connected to the T phase terminal of the power source to be tested
- Two resistors connected in series (fifth resistor R 5 , sixth resistor R 6 ), between the first resistor R 1 and the second resistor R 2 , and the third resistor R 3 and between the fourth resistor R 4, the relay RS is provided between the fifth resistor R 5 of the sixth resistor R 6.
- the relay RS is on / off controlled in response to an on / off operation of a first switch S1 to a fourth switch S4, which will be described later, so that a current flows through a corresponding resistor when the relay RS is in an on state.
- the relay RS may be a triple switch in which a U-phase relay, a V-phase relay, and a W-phase relay are operated on and off in conjunction with each other, or each of them is a single series that operates on and off independently. It may be a switch.
- One terminal of the second resistor R 2 in each of the resistor group is connected to a U-phase line UB extending from the U-phase terminal U 1 to be connected to the R phase terminal under test power supply, a fourth resistor R 4 one terminal of is connected to the V-phase line VB which extends from the V-phase terminal V 1 to be connected to the S phase terminal tested power, one terminal of the sixth resistor R 6 is, T phase tested power It is connected to the W-phase line WB extending from the W-phase terminal W 1 to be connected to the terminal.
- One terminal of the first resistor R 1 , one terminal of the third resistor R 3 , and one terminal of the fifth resistor R 5 in each resistor group are short-circuited.
- the number of resistor groups, their rated voltage and rated capacity, the wiring of resistors and relays, and the arrangement of voltmeters (or ammeters) to be described later are not limited to the above configuration.
- a bus bar or an electric cable connected to a resistor such as a voltmeter is connected to the resistance unit 20 and applied.
- An electrical signal detector 20a that detects the detected voltage is provided, and a temperature detector 20b that detects the exhaust temperature of the cooling air is provided downstream (upper part) of the flow of the cooling air of the resistor 20.
- the electric signal detection unit 20a detects the voltage applied to the resistance unit 20, and transmits information on the voltage to the control unit 80.
- the electric signal detector 20a includes a first voltage detector 20a1 to a third voltage detector 20a3.
- the first voltage detecting unit 20a1 has one terminal, a U-phase lines on UB extending from the U-phase terminal U 1 to be connected to the R phase terminal under test power supply, between the resistor 20 and the main switch 50 ( or, it is connected between) the tested power source and the main switch 50, the other terminal, a V-phase lines on VB extending from the V-phase terminal V 1 to be connected to the S phase terminal tested power, resistance unit between 20 and the main switch 50 (or, during the test subject power source and the main switch 50) is connected to a resistor for U-phase (first resistor R 1 and the second resistor R 2), a V-phase The voltage applied to the resistors (third resistor R 3 , fourth resistor R 4 ) is detected.
- the second voltage detection unit 20a2 has one terminal on the V-phase line VB and connected between the resistance unit 20 and the main switch 50 (or between the power supply to be tested and the main switch 50), and the other a terminals, W-phase lines on WB extending from the W-phase terminal W 1 to be connected to the T-phase terminal under test power supply, between the resistor 20 and the main switch 50 (or, tested power and a main switch 50 V-phase resistors (third resistor R 3 and fourth resistor R 4 ), and W-phase resistors (fifth resistor R 5 , sixth resistor R 6). ) Is detected.
- the third voltage detection unit 20a3 has one terminal on the W-phase line WB and connected between the resistance unit 20 and the main switch 50 (or between the power supply to be tested and the main switch 50), and the other Are connected on the U-phase line UB and between the resistor unit 20 and the main switch 50 (or between the power source to be tested and the main switch 50), and a W-phase resistor (fifth resistor) vessel R 5 and sixth resistor R 6), resistor for U-phase (first resistor R 1, to detect the voltage applied to the second resistor R 2).
- the temperature detection unit 20 b detects the exhaust temperature at the upper part (downstream) of the resistance unit 20 and transmits information related to the exhaust temperature to the control unit 80.
- the housing 30 is a case for holding a load testing device such as the cooling fan 10, the resistance unit 20, the main switch 50, the operation unit 60, and the control unit 80.
- An intake port 31 is provided on the side surface (upstream) of the casing 30 below the cooling fan 10, and an exhaust port 33 is provided above (downstream) the resistor portion 20.
- the intake port 31 is provided with an intake lid 32 that is opened during use and closed when not in use, and the exhaust port 33 is provided with an exhaust lid 34 that is opened during use and closed when not in use.
- the intake lid 32 opens and closes via a first actuator 32a that operates in conjunction with an on / off operation of the operation unit 60 (on / off operation switch 60a).
- the intake lid 32 includes a proximity sensor, a limit switch, and the like, and is provided with an intake opening detection unit 32b that detects whether the intake lid 32 is open or closed, that is, whether the intake port 31 is open.
- an intake opening detection unit 32b that detects whether the intake lid 32 is open or closed, that is, whether the intake port 31 is open.
- the intake opening detection unit 32b detects whether or not the intake lid 32 is open, and transmits information regarding whether or not the intake lid 32 is open to the control unit 80. However, it may be configured to detect the opening / closing degree of the intake lid 32 more finely.
- the exhaust lid 34 opens and closes via a second actuator 34a that operates in conjunction with the on / off operation of the operation unit 60 (on / off operation switch 60a).
- the exhaust lid 34 includes a proximity sensor, a limit switch, and the like, and is provided with an exhaust opening detection unit 34b that detects whether the exhaust lid 34 is opened or closed, that is, whether the exhaust port 33 is open. Note that the exhaust lid 34 may be manually opened and closed without being limited to automatic opening and closing using the second actuator 34a.
- the exhaust opening detection unit 34b detects whether or not the exhaust lid 34 is open, and transmits information regarding whether or not the exhaust lid 34 is open to the control unit 80. However, it may be configured to detect the opening / closing degree of the exhaust lid 34 more finely.
- the intake lid 32 and the exhaust lid 34 are described as being configured with hinged doors, but may be configured with other door structures such as sliding doors.
- the main switch 50 is composed of a vacuum circuit breaker (VCB: Vacuum Circuit Breaker) or the like, and is connected between the resistance unit 20 and the power source to be tested (on the U-phase line UB, on the V-phase line VB, on the W-phase).
- VB vacuum circuit breaker
- the main switch 50 is composed of a vacuum circuit breaker (VCB: Vacuum Circuit Breaker) or the like, and is connected between the resistance unit 20 and the power source to be tested (on the U-phase line UB, on the V-phase line VB, on the W-phase).
- VB Vacuum Circuit Breaker
- the main switch 50 While the load test apparatus 1 is operating normally, the main switch 50 is turned on, but the control unit 80 is one of the members constituting the load test apparatus 1 based on information from each detection unit. When it is determined that is not operating normally (when an abnormality is detected), the main switch 50 is turned off, that is, the off control for stopping the power supply from the power source to be tested to the resistance unit 20 is performed. Done.
- an on / off operation switch 60a for turning on or off the power supply of the load test apparatus 1 and a load amount are adjusted (a resistor group that supplies power from the test target power supply is selected. )
- a selection switch 60b (first switch S1 to fourth switch S4) is provided.
- the first actuator 32a When the on / off operation switch 60a is operated to turn on the main power supply of the load test apparatus 1, the first actuator 32a is turned on based on the power supplied from the drive power supply (auxiliary power supply) of the load test apparatus. In operation, the intake lid 32 opens, the second actuator 34a operates, and the exhaust lid 34 opens. The fan of the cooling fan 10 rotates, and the air taken in from the opening of the intake lid 32 is sent to the upper resistance unit 20. Further, based on the power supplied from the driving power source (auxiliary power source) of the load test apparatus, the control unit 80, the rotation state detection unit 10a, the electric signal detection unit 20a, the temperature detection unit 20b, the intake opening detection unit 32b, The exhaust opening detector 34b is activated.
- the driving power source auxiliary power source
- An on / off switch for the cooling fan 10 is provided separately from the on / off operation switch 60a, and the on / off switch for the cooling fan 10 is turned on when the on / off operation switch 60a is operated to turn on the main power supply of the load test apparatus 1.
- a mode in which the switch is operated to start rotation of the cooling fan 10 may be employed.
- the selector switch 60b (the first switch S1 to the fourth switch S4) is operated so that the resistance unit 20 can be energized.
- the switch 50 is turned on, the relay RS of the resistor group corresponding to the selection switch 60b (such as the first switch S1) selected to be energized is turned on, and the test target power supply connected via the main switch 50 Electric power is supplied to the resistor group that can be energized in the resistance unit 20.
- the first switch S1 and the second switch S2 when the first switch S1 and the second switch S2 are turned on and the third switch S3 and the fourth switch S4 are turned off, the first switch S1 and the second switch S2 correspond to the first switch S1 and the second switch S2.
- the relays RS of the first resistor group G1 and the second resistor group G2 having the rated capacity of 5 kW are turned on, and power from the test target power supply is supplied to the first resistor group G1 and the second resistor group G2.
- the relays RS of the third resistor group G3 and the fourth resistor group G4 with a rated capacity of 10 kW corresponding to the third switch S3 and the fourth switch S4 are turned off, and the third resistor group G3 and the fourth resistor The resistor group G4 is not supplied with power from the test target power source.
- the operation unit 60 includes an intake lid warning unit 61a, an exhaust lid warning unit 61b, a cooling fan warning unit 61c, a current / voltage warning unit 61d, and a temperature warning unit 61e.
- the voltage warning unit 61d and the temperature warning unit 61e perform warning output (see FIG. 4).
- the intake lid warning unit 61a is provided in the vicinity of the “intake lid” column provided in the operation unit 60.
- the intake lid warning unit 61a is lit for warning, and the off control detects the intake opening detection. The fact that it is based on the information from the part 32b is indicated by light.
- the exhaust lid warning unit 61b is provided in the vicinity of the “exhaust lid” column provided in the operation unit 60. When the exhaust lid 34 is not fully opened, the exhaust lid warning unit 61b is lit for warning and the off control is performed to detect the exhaust opening. Light indicates that the information is based on information from the unit 34b.
- the cooling fan warning unit 61c is provided in the vicinity of the “cooling fan” column provided in the operation unit 60.
- the cooling fan warning unit 61c is turned on for warning, and the OFF control is in the rotation state. Light indicates that the information is based on information from the detection unit 10a.
- the first warning unit 61d1 to the fourth warning unit 61d4 included in the current / voltage warning unit 61d are provided in the vicinity of the first switch S1 to the fourth switch S4, respectively, and the selection switch 60b (the first switch S1 to the fourth switch).
- the time series change (voltage waveform) of the voltage applied to the resistance unit 20 is not normal when S4) is operated, it is lit for warning, and the OFF control is based on information from the electrical signal detection unit 20a. Show that it is a thing.
- the current / voltage warning unit 61d is located near the first switch S1.
- the provided first warning unit 61d1 is lit for warning, and indicates by light that the off control is based on information from the electrical signal detection unit 20a resulting from the operation of the first switch S1.
- the current / voltage warning unit 61d includes: A first warning section 61d1 provided in the vicinity of the first switch S1 and a second warning section 61d2 provided in the vicinity of the second switch S2 are lit for warning, and the off control is performed by the first switch S1 and the second switch.
- the fact that it is based on information from the electrical signal detector 20a caused by the operation of S2 is indicated by light.
- the temperature warning unit 61e is provided in the vicinity of the “exhaust temperature” column provided in the operation unit 60. When the exhaust temperature is high and the resistor is not normally cooled, the temperature warning unit 61e is lit for warning and the off control is performed. It is indicated by light that it is based on information from the temperature detection unit 20b.
- All of the intake lid warning unit 61a, the exhaust lid warning unit 61b, the cooling fan warning unit 61c, the current / voltage warning unit 61d, and the temperature warning unit 61e operate normally in addition to warning lighting (for example, red lighting). It may be configured to light in another color (for example, light in green).
- the control unit 80 is a device that controls each part of the load test apparatus 1 such as the relay RS, the cooling fan 10, and the main switch 50.
- the operation state of the cooling fan 10 by the rotation state detection unit 10a, and the electric signal detection unit 20a The operation status of the relay RS of the resistor group corresponding to the selection switch 60b (the first switch S1 to the fourth switch S4) (the status of the voltage applied to the resistance unit 20), the intake opening detection unit 32b and the exhaust opening detection unit 34b After detecting the opening state of the opening (intake port 31 and exhaust port 33) in the casing 30 and the exhaust temperature downstream of the resistance unit 20 by the temperature detection unit 20b, the main switch 50 is turned off (from the power supply to be tested).
- control unit 80 receives information from the intake opening detection unit 32b, information from the exhaust opening detection unit 34b, information from the rotation state detection unit 10a, information from the electrical signal detection unit 20a, and information from the temperature detection unit 20b. Based on the information, off control is performed.
- step S11 to S21 The procedure of the off control by the control unit 80 will be described using the flowchart of FIG.
- the control in steps S11 to S21 is performed every first time t1 (for example, 60 sec) until the off control is performed after the main power supply of the load test apparatus 1 is turned on. Note that, after the time required for the intake lid 32 and the exhaust lid 34 to be opened by the first actuator 32a and the second actuator 34a has passed, not immediately after the main power supply of the load test apparatus 1 is turned on, It is desirable to start the procedure such as step S11.
- the control unit 80 determines whether or not the intake lid 32 is sufficiently open based on the information regarding the open / close state of the intake lid 32 from the intake opening detection unit 32b (see step S11), and determines that the intake lid is not open. In this case, the main switch 50 is turned off, and the power supply from the test target power supply to the resistance unit 20 of the load test apparatus 1 is stopped. Further, a warning that “the intake port 31 is not normally opened” is given (see step S12).
- a mode in which the intake lid warning unit 61a provided in the vicinity of the “intake lid” column in the operation unit 60 is turned on is considered (see FIG. 4).
- a display device 70 capable of displaying characters may be provided on the operation unit 60 and the like, and a message “Please open the intake lid because the intake port is not fully open” may be displayed. .
- the control unit 80 determines whether or not the exhaust lid 34 is sufficiently open based on the information on the open / close state of the exhaust lid 34 from the exhaust opening detection unit 34b (see step S13), and determines that the exhaust lid 34 is not open. In this case, the main switch 50 is turned off, and the power supply from the test target power supply to the resistance unit 20 of the load test apparatus 1 is stopped. Further, a warning that “the exhaust port 33 is not normally opened” is given (see step S14).
- the exhaust lid warning unit 61b provided in the vicinity of the “exhaust lid” column in the operation unit 60 can be considered.
- a display device 70 capable of displaying characters may be provided on the operation unit 60 or the like, and a message such as “Open the exhaust lid because the exhaust port is not fully open” may be displayed. .
- the control unit 80 determines whether or not the cooling fan 10 is operating sufficiently based on the information regarding the number of rotations of the cooling fan 10 from the rotation state detection unit 10a (for example, the number of rotations of the cooling fan 10 rotates more than a threshold value). (Refer to step S15), and when it is determined that it is not operating, the main switch 50 is turned off, and the power from the power source to be tested to the resistance unit 20 of the load test apparatus 1 Stop supplying. Further, a warning that “the cooling fan 10 is not operating normally” is given (see step S16).
- a mode in which the cooling fan warning unit 61c provided in the vicinity of the “cooling fan” column in the operation unit 60 can be considered. Further, a display device 70 capable of displaying characters is provided on the operation unit 60 and the like, and a message “Please check the cooling fan because the cooling fan is not operating sufficiently” is displayed. Also good.
- the control unit 80 determines whether or not the voltage applied to the resistance unit 20 is within a normal operation range based on information on the voltage applied to the resistance unit 20 from the electrical signal detection unit 20a. When it is determined that it is out of the range during normal operation, the main switch 50 is turned off to stop the power supply from the test target power source to the resistance unit 20 of the load test apparatus 1. In addition, a warning that “the waveform of the voltage applied to the resistor 20 at the time of the switch operation is not normal” is given (see steps S17 to S19).
- control unit 80 records a voltage waveform (detection voltage waveform, detection information) obtained by the first voltage detection unit 20a1 to the third voltage detection unit 20a3 and indicating a change in voltage value in time series. (For example, update every 1 ms).
- the voltage waveform (detected voltage waveform) obtained by the first voltage detecting unit 20a1 to the third voltage detecting unit 20a3 and recorded in the control unit 80 or the like here is a substantially sinusoidal waveform in which detected voltage values are arranged in time series ( 6), the sine wave based on the AC waveform of the power supplied from the power source to be tested to the resistance unit 20 is removed, and the relay RS changes from the on state to the off state, or from the off state to the on state. Except for the voltage change when changing, a substantially constant waveform is shown (see FIG. 7).
- the test target power source is a DC power source and the detected waveform does not include a sine wave corresponding to the power from the test target power source, the calculation for removing the sine waveform is not performed.
- the control unit 80 selects any of the selection switches 60b (the first switch S1 to the fourth switch S4) during the past first time t1 that is traced back from the current time (the operation start time in Step S17). It is determined whether or not an operation has been performed (see step S17).
- the control unit 80 is operated when any of the selection switches 60b (first switch S1 to fourth switch S4) is operated during the past first time t1. Compare the voltage waveform (see FIG. 8) between the second time t2 ( ⁇ t1, for example, 1 ms) and the voltage waveform (normal voltage waveform, reference information) when operating normally with the same switch operating state. (See step S18).
- the voltage waveform (normal voltage waveform) in the case of normal operation here is a test from a substantially sinusoidal waveform (see FIG. 9) in which voltage values obtained in advance by experiments or the like are arranged in time series before performing a load test.
- a sine wave based on the AC waveform of the power supplied from the target power supply to the resistor unit 20 is removed, and the voltage change when the relay RS changes from the on state to the off state or changes from the off state to the on state. Except for this, it shows a substantially constant waveform (see FIG. 10).
- the power supply to be tested is a DC power supply
- the voltage waveform obtained by experiments before the load test does not include a sine wave corresponding to the power from the power supply to be tested
- the sine waveform is used. The calculation to remove is not performed.
- the third switch S3 is A voltage waveform (detection voltage waveform) from the time when the switch is turned on to the second time t2 and a voltage waveform (normal voltage waveform) at the normal time when the third switch S3 is turned on from this state. Compare.
- control unit 80 it is desirable for the control unit 80 to record a normal voltage waveform pattern when one or more switches in various switch states are operated as reference information.
- the control unit 80 turns off the main switch 50 and turns on the power supply to be tested. Power supply to the resistance unit 20 of the load test apparatus 1 is stopped.
- the control unit 80 detects the The current / voltage warning unit 61d in the vicinity of the switch is turned on as an output of information regarding the relay RS that is determined not to operate normally based on the comparison result between the information and the reference information (see step S19).
- control unit 80 determines that the relay RS is normal based on detection information (detection voltage waveform) that is information from the electrical signal detection unit 20a and includes time-series changes in voltage when the selection switch 60b is operated.
- detection information detection voltage waveform
- the relay RS is determined not to operate normally, an off control for stopping the power supply from the test target power source to the resistance unit 20 is performed.
- the control unit 80 lights the current / voltage warning unit 61d in the vicinity of the plurality of switches.
- the control unit 80 determines the voltage waveform between the time when each operation is performed and the second time t2. (Detection voltage waveform) is compared with the voltage waveform (normal voltage waveform) when the switch operates normally in the same switch operation state. If the difference is large, off control is performed and the current in the vicinity of the operated switch / The voltage warning unit 61d is turned on.
- positioned in the vicinity of the switch corresponding to relay RS with high possibility is considered.
- a display device 70 capable of displaying characters is provided in the operation unit 60 or the like, for example, “(because the waveform of the voltage applied to the first resistor group corresponding to the first switch is not normal) The message “Please check the relay corresponding to one switch (the relay of the first resistor group)” may be displayed.
- the relay RS having an abnormality is for the U-phase line, the V-phase line, or the W-phase line.
- the first switch S1 corresponds to the first switch S1.
- Relay RS that is, the relay RS of the first resistor group G1, and it can be specified that there is an abnormality in the V-phase line relay.
- a warning display may be used to indicate whether there is an abnormality in the relay RS for U-phase wire, V-phase wire, or W-phase wire.
- three warning devices are provided in the vicinity of each of the first switch S1 to the fourth switch S4, and the relay that is determined to be abnormal among the U-phase line, the V-phase line, and the W-phase line is provided.
- a form in which the corresponding warning device is turned on is conceivable.
- the display device 70 displays a relay corresponding to the first switch (because the waveform of the voltage applied to the first resistor group corresponding to the first switch is not normal) (relay of the first resistor group).
- the message indicating the relay having a high possibility of abnormality may be displayed (see FIG. 11).
- a region (normal waveform region, see FIG. 12) having a certain width in the vertical and horizontal directions is set with respect to the voltage waveform (see FIG. 10) when operating normally, and the detected voltage Whether or not the waveform is within the range of the normal waveform region is performed.
- the normal waveform region includes a normal voltage waveform and is indicated by a curve having a certain width (reference waveform region).
- each of the voltage values indicated by the detected voltage waveform is within the normal waveform area by superimposing the detected voltage waveform on the normal waveform area. If the time zone included in the range is longer than the threshold, it is determined that the relay RS corresponding to the operated selection switch 60b is operating normally. If the time zone is shorter than the threshold, the relay A form in which it is determined that the RS is not operating normally is conceivable.
- the voltage waveform after the switch operation and removing the sine wave is normal. Since it is out of the range of the waveform region (see FIG. 12) (the time zone within the range of the normal waveform region in the detected voltage waveform is short), the relay RS corresponding to the operated selection switch 60b is not operating normally. To be judged.
- the voltage waveform after the switch operation and after removing the sine wave is substantially the same as that shown in FIG.
- the relay RS corresponding to the operated selection switch 60b is normal because it is equivalent and is included in the range of the normal waveform region (see FIG. 12) (the time zone within the range of the normal waveform region in the detected voltage waveform is long). It is determined that it is operating.
- a plurality of threshold values may be provided, and a stage of performing only warning (information output) without performing off control and a stage of performing both off control and warning may be employed.
- the relay RS corresponding to the operated selection switch 60b when the time zone in the range of the normal waveform region in the detected voltage waveform is shorter than the first threshold, it is determined that there is a high possibility that the relay RS corresponding to the operated selection switch 60b is not operating normally.
- the warning is displayed together with the OFF control, and the time period is longer than the first threshold and shorter than the second threshold (second threshold> first threshold), the relay RS corresponding to the operated selection switch 60b.
- the replacement time is near, and the warning indication is displayed without performing the OFF control (for example, there is a relay RS that is likely to break down in the near future, so that repair or replacement is recommended.
- the time zone is longer than the second threshold, it is determined that the relay RS corresponding to the operated selection switch is operating normally, and the off-control is performed. And a warning not displayed form can be considered.
- Such a warning makes it possible to notify the replacement timing of the relay RS before the load test apparatus 1 becomes unable to operate normally due to a failure.
- a normal voltage waveform pattern is recorded in advance as reference information, and when the detected voltage waveform is similar to the normal voltage waveform (included within the normal waveform region), A mode has been described in which it is determined that the relay RS is operating normally, and when the relay RS is not similar, it is determined that the relay RS is not operating normally.
- the relay RS is not operating normally.
- the form to judge may be sufficient.
- the voltage change (the amount of change (width) of the voltage value per unit time) from the time the switch is operated is greater than the predetermined amount.
- step S17 If it is determined in step S17 that none of the selection switches 60b (the first switch S1 to the fourth switch S4) is operated during the past first time t1 in the voltage waveform, the determination in step S18. If any of the selection switches 60b has been operated, but it is determined that the relay RS is operating normally, the process proceeds to step S20.
- the control unit 80 In the voltage waveform, when any of the selection switches 60b (the first switch S1 to the fourth switch S4) is not operated during the past first time t1, the control unit 80 is connected to the resistance unit 20.
- the form which judges abnormality may be sufficient.
- control unit 80 determines the current voltage value (or the voltage between the present time and the past second time t2) from the voltage waveforms obtained by the first voltage detection unit 20a1 to the third voltage detection unit 20a3. The average value) is compared with the normal voltage value corresponding to the current switch state.
- control unit 80 records voltage values in various switch states.
- the control unit 80 issues a current / voltage warning in the vicinity of the switch that has been turned on.
- the part 61d is turned on.
- the lighting of the current / voltage warning unit 61d is performed at the time of failure of the relay RS and at the time of warning of the failure of the resistor. It is desirable to perform different lighting operations. Or the form which provides the lighting device for the malfunction warning of the relay RS for the malfunction warning of a resistor may be sufficient.
- the control unit 80 determines whether or not the exhaust temperature exceeds the temperature threshold based on the information regarding the exhaust temperature from the temperature detection unit 20b (see step S20).
- the switch 50 is turned off, and the power supply from the power source to be tested to the resistance unit 20 of the load test apparatus 1 is stopped. Further, a warning that “the resistor is not properly cooled” is given (see step S21).
- a form in which the temperature warning unit 61e provided near the “exhaust temperature” column in the operation unit 60 is turned on can be considered.
- a display device 70 capable of displaying characters is provided in the operation unit 60 and the like, and a message “Please check each part because the resistor is not properly cooled.” Is displayed. Good.
- the cooling fan 10 When the load test apparatus 1 is operating normally, the cooling fan 10 is sucked from the opening (intake port 31) where the intake lid 32 is opened, and the ventilation from the cooling fan 10 passes through the resistance unit 20, The exhaust lid 34 is discharged from an opening (exhaust port 33).
- the cooling fan 10 is operating normally, and the voltage applied to the resistor is within a normal range, the resistor is cooled by the air blown from the cooling fan 10 and the hot air Is discharged from the exhaust port 33 and the load test can be performed safely.
- the resistor When the resistor is damaged or dust is attached, the voltage applied to the resistor becomes high due to a short circuit or the like, and even if the cooling fan 10 operates normally, the resistor is hardly cooled. .
- the cooling fan 10 Even if each device is operating normally, the cooling fan 10 is within the normal operation range but the rotation speed is low (close to the lower limit value of the normal operation range), and the voltage applied to the resistor is also normal. If the cooling capacity is low and the temperature of the object to be cooled is high, such as when the voltage value is high (close to the upper limit of the normal operating range) within the operating range, the resistor may become difficult to cool. Conceivable. Further, even when foreign matter is mixed into the resistor unit 20 and the like, the cooling fan 10 operates normally, and a voltage in a normal range is applied to the resistor group, the resistor may be difficult to cool.
- the control unit 80 includes the operation state of the cooling fan 10 by the rotation state detection unit 10a, the voltage state of the resistance unit 20 by the electric signal detection unit 20a, and the housing by the intake opening detection unit 32b and the exhaust opening detection unit 34b.
- the main switch 50 is turned off after detecting the opening state of the body 30 (the intake port 31 and the exhaust port 33) and the exhaust gas temperature downstream of the resistance unit 20 (near the exhaust port 33) by the temperature detection unit 20b. Therefore, when a problem occurs in the load test apparatus 1, the power supply from the test target power supply to the load test apparatus 1 (resistor unit 20) is stopped. For this reason, it is possible to appropriately detect abnormality inside the load test apparatus 1 and prevent further failure of the load test apparatus 1.
- the abnormality of the relay RS corresponding to the selection switch 60b (the first switch S1 to the fourth switch S4) is detected using the electric signal detection unit 20a.
- the change in the waveform immediately after the operation of the selection switch 60b is more likely to be caused by a failure (particularly, contact failure) of the relay RS corresponding to the operated selection switch 60b than a possibility caused by the failure of the resistor.
- the operated selection switch 60b It becomes possible to determine whether or not the corresponding relay RS is operating normally.
- the abnormality can be detected by another sensor.
- the temperature detection unit 20b detects that the exhaust temperature is higher than the normal value. It is possible to detect anomalies as a whole.
- a warning using the intake lid warning unit 61a or the like is given, and the location of the malfunction is indicated, so that it is a problem of the opening of the lid, a malfunction of the cooling fan 10, or a malfunction of the relay RS (and which relay) It is possible to visually check whether it is a fault of RS) or other faults (or an overall fault), and there is also an advantage that the fault can be easily improved.
- the load test apparatus 1 in this embodiment can be applied to a low-voltage load test apparatus corresponding to a low-voltage power supply as shown in FIG. 14, or can be applied to a high-voltage power supply as shown in FIG. It can also be applied to a high-pressure load test apparatus.
- the warning may be in the form of an output using light to make the user visually recognize, may be in the form of audio output, or may be in the form of warning using both.
- the abnormality detection of the relay RS is described based on the waveform of the voltage applied to the resistance unit 20 when the selection switch 60b is operated (voltage time-series change).
- a configuration may be employed in which abnormality detection of the relay RS is performed based on the waveform of the current flowing through the resistance unit 20 when the switch 60b is operated (time-series change in current) (see FIG. 16).
- the electrical signal detector 20a includes a first current detector 20a4 to a third current detector 20a6.
- the first current detection unit 20a4 is provided on the U-phase line UB and between the resistance unit 20 and the main switch 50 (or between the power supply to be tested and the main switch 50), and is a U-phase resistor. The current flowing through (first resistor R 1 and second resistor R 2 ) is detected.
- the second current detection unit 20a5 is provided on the V-phase line VB and between the resistor unit 20 and the main switch 50 (or between the power source to be tested and the main switch 50), and is a V-phase resistor. The current flowing through (third resistor R 3 and fourth resistor R 4 ) is detected.
- the third current detection unit 20a6 is provided on the W-phase line WB and between the resistance unit 20 and the main switch 50 (or between the power source to be tested and the main switch 50), and is a W-phase resistor. detecting (the fifth resistor R 5 second resistor R 6) the current flowing through the.
- the control unit 80 determines whether or not the current flowing through the resistance unit 20 is within a normal operation range based on the information regarding the current flowing through the resistance unit 20 from the electrical signal detection unit 20a. If it is determined that it is out of the range, the main switch 50 is turned off to stop the power supply from the test target power source to the resistance unit 20 of the load test apparatus 1. In addition, a warning that “the waveform of the current flowing through the resistor 20 during switch operation is not normal” is issued.
- control unit 80 records a current waveform (detected current waveform, detected information) obtained by the first current detecting unit 20a4 to the third current detecting unit 20a6 and indicating a change in current value in time series. (For example, update every 1 ms).
- the current waveform (detected current waveform) obtained by the first current detector 20a4 to the third current detector 20a6 and recorded in the controller 80 or the like here is a substantially sine waveform in which the detected current values are arranged in time series.
- the test target power source is a DC power source and the detected waveform does not include a sine wave corresponding to the power from the test target power source, the calculation for removing the sine waveform is not performed.
- the control unit 80 determines which of the selection switches 60b (the first switch S1 to the fourth switch S4) during the past first time t1 that goes back from the current time (the operation start time in step S17). It is determined whether or not an operation has been performed (see step S17).
- the control unit 80 is operated when any of the selection switches 60b (the first switch S1 to the fourth switch S4) is operated during the past first time t1.
- the detected current waveform from time to second time t2 ( ⁇ t1, for example, 1 ms) is compared with the current waveform (normal current waveform, reference information) when operating normally with the same switch operating state (step S18). reference).
- the current waveform in the case of normal operation here is the power supplied from the power source to be tested to the resistance unit 20 from a substantially sine waveform in which current values obtained in advance through experiments or the like are arranged in time series.
- the sine wave based on the AC waveform is removed, and a substantially constant waveform is shown except for a change in current when the relay RS changes from an on state to an off state, or from an off state to an on state.
- test target power source is a DC power source and the current waveform obtained by experiments before the load test does not include a sine wave corresponding to the power from the test target power source, the sine waveform The calculation to remove is not performed.
- the third switch S3 is A current waveform (detected current waveform) from the time when the switch is turned on to the second time t2 and a normal current waveform (normal current waveform) when the third switch S3 is turned on from this state. Compare.
- control unit 80 it is desirable for the control unit 80 to record a normal current waveform pattern when one or more switches from various switch states are operated as reference information.
- the control unit 80 turns off the main switch 50 and turns on the power source to be tested. Power supply to the resistance unit 20 of the load test apparatus 1 is stopped.
- the control unit 80 detects the The current / voltage warning unit 61d in the vicinity of the switch is turned on as an output of information related to the relay RS (relay RS that is not operating normally) identified based on the comparison result between the information and the reference information (see step S19). .
- the control unit 80 determines the current waveform from the time when each operation is performed to the second time t2. (Detection current waveform) is compared with the current waveform (normal current waveform) when operating normally in the same switch operating state. If the difference is large, the current in the vicinity of the operated switch is controlled. / The voltage warning unit 61d is turned on.
- a malfunction occurs in the current / voltage warning unit 61d (first warning unit 61d1 to fourth warning unit 61d4) provided in the vicinity of the first switch S1 to the fourth switch S4 in the operation unit 60.
- positioned in the vicinity of the switch corresponding to the relay RS with high possibility is considered.
- a display device 70 capable of displaying characters is provided in the operation unit 60 or the like, for example, “(since the waveform of the current flowing through the first resistor group corresponding to the first switch is not normal), the first switch "Please check the relay corresponding to (the relay of the first resistor group)" may be displayed.
- the relay RS having an abnormality is for the U-phase line, the V-phase line, or the W-phase line.
- the relay RS corresponding to the first switch S1 that is, the first resistor group G1 It is a relay RS, and it can be specified that there is an abnormality in the relay for the U-phase line.
- the current waveform comparison is the same as the voltage waveform comparison.
- a normal current waveform pattern is recorded in advance as reference information, and when the detected current waveform is similar to the normal voltage waveform (included in the normal waveform region), A mode has been described in which it is determined that the relay RS is operating normally, and when the relay RS is not similar, it is determined that the relay RS is not operating normally.
- the relay RS is not operating normally.
- the form to judge may be sufficient.
- the current change from the time when the switch is operated (current value change amount (width) per unit time) is more than a predetermined amount.
- a mode in which the length of time until the steady state becomes smaller is measured, and an abnormality determination may be made in comparison with the normal state.
- the electric signal detection unit 20a may be configured to detect at least one of current and voltage, but may be configured to detect both current and voltage in order to accurately detect an abnormality.
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Abstract
Description
本実施形態では、冷却ファン10と抵抗部20とが縦積みされる形態を説明するが、横方向に並べられる形態であってもよい。
抵抗器は、電熱線で構成されたものに限らず、バッテリーなど内部に電力を蓄積出来るものであってもよい。
リレーRSは、図3のように、U相用のリレーとV相用のリレーとW相用のリレーが連動してオンオフ動作する三連スイッチでもよいし、それぞれが単独でオンオフ動作する単連スイッチであってもよい。
すなわち、制御部80は、吸気開口検知部32bからの情報、排気開口検知部34bからの情報、回転状態検知部10aからの情報、電気信号検知部20aからの情報、および温度検知部20bからの情報に基づいて、オフ制御を行う。
また、操作部60などに、文字表示が可能な表示装置70を設けて、「吸気口が十分に開いていないので、吸気蓋を開けてください。」というメッセージを表示させる形態であってもよい。
また、操作部60などに、文字表示が可能な表示装置70を設けて、「排気口が十分に開いていないので、排気蓋を開けてください。」というメッセージを表示させる形態であってもよい。
また、操作部60などに、文字表示が可能な表示装置70を設けて、「冷却ファンが十分に動作していないので、冷却ファンを確認してください。」というメッセージを表示させる形態であってもよい。
正常波形領域は、正常電圧波形を含み、一定幅の曲線で示される(基準波形領域)。
また、操作部60などに、文字表示が可能な表示装置70を設けて、「抵抗器が正常に冷却されていないので、各部を確認してください。」というメッセージを表示させる形態であってもよい。
選択スイッチ60bの操作直後における波形の変化は、抵抗器の不具合に起因する可能性よりも、操作した選択スイッチ60bに対応するリレーRSの不具合(特に、接触不良)に起因する可能性が高い。
10 冷却ファン
10a 回転状態検知部
20 抵抗部
20a 電気信号検知部
20a1~20a3 第1電圧検知部~第3電圧検知部
20a4~20a6 第1電流検知部~第6電流検知部
20b 温度検知部
30 筐体
31 吸気口
32 吸気蓋
32a 第1アクチュエータ
32b 吸気開口検知部
33 排気口
34 排気蓋
34a 第2アクチュエータ
34b 排気開口検知部
50 メインスイッチ
60 操作部
60a オンオフ操作スイッチ
60b 選択スイッチ
61a 吸気蓋警告部
61b 排気蓋警告部
61c 冷却ファン警告部
61d 電流/電圧警告部
61d1~61d4 第1警告部~第4警告部
61e 温度警告部
70 表示装置
80 制御部
G1~G4 第1抵抗器群~第4抵抗器群
R1~R6 第1抵抗器~第6抵抗器
RS リレー
S1~S4 第1スイッチ~第4スイッチ
U1 U相端子
UB U相用線
V1 V相端子
VB V相用線
W1 W相端子
WB W相用線
Claims (10)
- リレーと抵抗器を含む抵抗器群を有し、負荷試験を行うために試験対象電源と接続される抵抗部と、
前記抵抗器群に、前記試験対象電源からの電力を供給するか否かを選択するために使用される選択スイッチと、
前記抵抗部に印加された電圧と、前記抵抗部に流れる電流の少なくとも一方を検知する電気信号検知部と、
制御部とを備え、
前記選択スイッチのオンオフ状態に対応して、前記リレーが動作することにより、前記試験対象電源から前記リレーを含む抵抗器群への電力供給が制御されるものであり、
前記制御部は、前記電気信号検知部からの情報であって、前記選択スイッチが操作された時の前記電圧と前記電流の少なくとも一方の時系列変化を含む検知情報に基づいて、前記リレーが正常に動作しているか否かの判断を行い、前記リレーが正常に動作していないと判断した場合に、前記試験対象電源から前記抵抗部への電力供給を停止するオフ制御を行うことを特徴とする負荷試験装置。 - 前記制御部は、前記選択スイッチが操作された時の前記電圧と前記電流の少なくとも一方の時系列変化の情報であって、前記負荷試験を行う前に予め記録された基準情報と、前記検知情報との比較を行い、前記比較の結果に基づいて、前記判断を行うものであり、
前記試験対象電源が交流電源である場合には、前記基準情報や前記検知情報から、前記試験対象電源から前記抵抗部に供給される電力の交流波形に基づく正弦波を取り除いたもので、前記比較が行われることを特徴とする請求項1に記載の負荷試験装置。 - 前記オフ制御の時に、光と音の少なくとも一方で情報を出力する警告部を更に備え、
前記制御部は、前記オフ制御の時に、前記比較の結果に基づいて、前記リレーのうち正常に動作していないと判断されたリレーに関する情報を前記警告部に出力させることを特徴とする請求項2に記載の負荷試験装置。 - 前記試験対象電源は交流電源であり、
前記電気信号検知部は、前記抵抗部におけるU相用の抵抗器とV相用の抵抗器に印加された電圧を検知する第1電圧検知部と、前記V相用の抵抗器と前記抵抗部におけるW相用の抵抗器に印加された電圧を検知する第2電圧検知部と、前記W相用の抵抗器と前記U相用の抵抗器に印加された電圧を検知する第3電圧検知部を有し、
前記検知情報は、前記第1電圧検知部、前記第2電圧検知部、前記第3電圧検知部からの情報であることを特徴とする請求項3に記載の負荷試験装置。 - 前記試験対象電源は交流電源であり、
前記電気信号検知部は、前記抵抗部におけるU相用の抵抗器に流れる電流を検知する第1電流検知部と、前記抵抗部におけるV相用の抵抗器に流れる電流を検知する第2電流検知部と、前記抵抗部におけるW相用の抵抗器に流れる電流を検知する第3電流検知部とを有し、
前記検知情報は、前記第1電流検知部、前記第2電流検知部、前記第3電流検知部からの情報であることを特徴とする請求項3に記載の負荷試験装置。 - 前記選択スイッチが操作された時の前記電圧と前記電流の少なくとも一方の時系列変化を示す波形を含み、一定幅の曲線で示される基準波形領域が、前記基準情報として、前記検知情報と比較され、
前記制御部は、前記検知情報を示す波形を前記基準波形領域と重ね合わせした場合に、前記検知情報を示す波形における、前記基準波形領域に含まれる時間帯の長さに基づいて、前記判断を行うことを特徴とする請求項2に記載の負荷試験装置。 - 前記選択スイッチが操作され、前記選択スイッチの動作に対応して前記リレーが正常に動作した場合における前記電圧と前記電流の少なくとも一方の時系列変化を示す波形を含み、一定幅の曲線で示される基準波形領域が、前記基準情報として、前記検知情報と比較され、
前記制御部は、前記検知情報を示す波形を前記基準波形領域と重ね合わせした場合に、前記検知情報を示す波形における、前記基準波形領域に含まれる時間帯の長さが、第1閾値よりも短い場合に、前記オフ制御を行うことを特徴とする請求項2に記載の負荷試験装置。 - 前記オフ制御の時に、光と音の少なくとも一方で情報を出力する警告部を更に備え、
前記制御部は、前記検知情報を示す波形を前記基準波形領域と重ね合わせした場合に、前記検知情報を示す波形における、前記基準波形領域に含まれる時間帯の長さが、前記第1閾値以上に長く、前記第1閾値よりも大きい第2閾値よりも短い場合に、前記オフ制御を行わず、前記警告部による情報出力を行わせることを特徴とする請求項7に記載の負荷試験装置。 - 前記検知情報は、前記電圧と前記電流の少なくとも一方の時系列変化であって、前記選択スイッチが操作された時から、前記電圧と前記電流の少なくとも一方が定常状態になるまでの時間であり、
前記試験対象電源が交流電源である場合には、前記基準情報や前記検知情報から、前記試験対象電源から前記抵抗部に供給される電力の交流波形に基づく正弦波を取り除いたもので、前記定常状態になるまでの時間が、前記検知情報であることを特徴とする請求項1に記載の負荷試験装置。 - 前記制御部は、前記選択スイッチが操作されてから一定時間における前記検知情報に基づいて、前記判断を行うことを特徴とする請求項1に記載の負荷試験装置。
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