JP5654825B2 - Insulation resistance measuring device - Google Patents

Description

The present invention relates to an insulation resistance measuring device for displaying the measured value by measuring the insulation resistance of the measured object.

As this type of insulation resistance measuring device, a digital insulation resistance meter disclosed in Japanese Patent No. 2929760 is known. This digital insulation resistance meter includes a DC power supply, a transformer, a transistor, an oscillator, a voltage doubler rectifier circuit, and the like, and is configured to be able to display a resistance measurement value on a digital display unit and a bar graph display unit.

Japanese Patent No. 2929760 (page 2-4, Fig. 1-2)

However, the digital insulation resistance meter has the following problems to be solved. In other words, this type of insulation resistance measuring device including the above digital insulation resistance meter has a function of displaying a resistance measurement value, but may be inconvenient when used in a specific inspection. Specifically, when measuring the insulation resistance of a measurement object having a polarity like a battery, measure the insulation resistance between the positive electrode and the housing and the insulation resistance between the negative electrode of the battery and the housing. However, the manufacturer and the manufacturing industry define a test that determines whether the insulation state of the battery is good or not based on whether or not the average value of the resistance measurement values obtained by these two measurements is greater than or equal to the reference value. In this case, it is necessary to read and record the resistance measurement value displayed on the display unit when the measurement is performed twice, and then calculate the average value from the recorded resistance measurement value. When such an inspection is performed on a large number of batteries, it is necessary to perform an operation of recording a resistance measurement value and an operation of calculating an average value from the recorded resistance measurement value many times. For this reason, due to these complicated operations, it is difficult to improve the inspection efficiency, and human error may occur in the recording and calculation operations, which makes it difficult to improve the inspection accuracy. Yes.

The present invention has been made in view of such a problem, and has as its main object to provide an insulation resistance measuring device capable of improving inspection efficiency and inspection accuracy when inspecting a measurement object using measurement values. To do.

Insulation resistance measuring apparatus according to claim 1, wherein to achieve the above object, measuring instructions and measuring unit for measuring the insulation resistance of the measured object according, measured by the measuring unit controls the display section of the insulation resistance An insulation resistance measuring device including a control unit that causes a display unit to display a display value based on a measurement value, the storage unit storing the measurement value last measured by the measurement unit, and the control unit When the measurement value is already stored in the storage unit at the time when the measurement instruction is given, the measurement value is newly measured by the first measurement value as the measurement value stored in the storage unit and the measurement unit. The average value of the second measurement value as the measurement value, the smaller one of the first measurement value and the second measurement value, and the larger one of the first measurement value and the second measurement value Less value of Wherein after displaying on the display unit, and stores the second measured value is overwritten in the storage unit as the first measurement value is also a single value as the display value.

The insulation resistance measuring device of claim 2, in the insulation resistance measuring apparatus according to claim 1, wherein the control unit displays the measured value the newly measured said display unit with at least one value .

The insulation resistance measuring apparatus according to claim 3, wherein, in the insulation resistance measuring apparatus according to claim 1 or 2, wherein, said display the measurement values stored in the storage unit together with the at least one value Display on the screen.

In the insulation resistance measuring apparatus according to claim 1, when the measurement value is already stored in the storage unit at the time when the measurement instruction is given, the measurement value is newly measured by the first measurement value and the measurement unit stored in the storage unit. The average value of the second measurement value, the smaller value (minimum value) of the first measurement value and the second measurement value, and the larger value (maximum value) of the first measurement value and the second measurement value After displaying at least one value) as a display value on the display unit, the second measurement value is overwritten and stored in the storage unit as the first measurement value . For this reason, in this insulation resistance measuring apparatus, for example, after measuring the insulation resistance between the positive electrode side terminal and the housing in the measurement object having a polarity like a solar cell, the negative electrode side terminal and the housing When the insulation resistance between the two is measured, at least one of the average value, the minimum value, and the maximum value of the two measurement values can be automatically displayed on the display unit. Therefore, according to this insulation resistance measuring device, the measurement of the insulation resistance between the terminal on the positive electrode side and the housing and the measurement of the insulation resistance between the terminal on the negative electrode side and the housing are performed every two measurements. There is no need to record the displayed measurement values, and the complicated work of calculating the average value from the two measurement values in these two measurements and comparing the two measurement values may be omitted. As a result, inspection efficiency and inspection accuracy can be sufficiently improved.

In the insulation resistance measuring apparatus according to the second aspect, the measurement value newly measured by the measurement unit is displayed on the display unit together with at least one of the average value, the minimum value, and the maximum value. For this reason, according to this insulation resistance measuring apparatus, in addition to the average value, the minimum value, and the maximum value, it can be used in an inspection that requires a newly measured value (second measured value). The range of use can be expanded sufficiently.

In the insulation resistance measuring apparatus according to the third aspect, the measurement value stored in the storage unit is displayed on the display unit together with at least one of the average value, the minimum value, and the maximum value. For this reason, according to this insulation resistance measuring apparatus, for example, a little time elapses from the previous (first) measurement to the next (second) measurement, and the first measurement is performed. Even if it is unclear whether or not the current measurement has been performed (whether or not the current measurement is the second measurement), it is possible to ensure that the user is aware of this, so the convenience is sufficient. Can be improved.

1 is a configuration diagram showing a configuration of an insulation resistance measuring device 1. FIG. 1 is a perspective view showing a configuration of an insulation resistance measuring device 1. FIG. 2 is a configuration diagram showing a configuration of a solar cell 200. FIG. 10 is a flowchart of a display process 50. FIG. 6 is a first display screen diagram illustrating a display mode by the display unit 16. FIG. 10 is a second display screen diagram showing a display mode by the display unit 16. FIG. 10 is a third display screen diagram illustrating a display mode by the display unit 16. FIG. 10 is a fourth display screen diagram illustrating a display mode by the display unit 16. FIG. 10 is a fifth display screen diagram illustrating a display mode by the display unit 16. FIG. 10 is a sixth display screen diagram illustrating a display mode by the display unit 16.

Embodiments of an insulation resistance measuring apparatus according to the present invention will be described below with reference to the accompanying drawings.

First, the configuration of the insulation resistance measuring apparatus 1 will be described with reference to the drawings. Insulation resistance measuring apparatus shown in FIG. 1 1 is an example of the insulation resistance measuring device, connected to the module is an assembly of a plurality of strings (solar battery cells constituting the solar cell 200 shown in FIG. 3, for example a plurality series the structure) sets 201 a to 201 n (hereinafter, measurable insulation resistance between the distinction when not is also referred to as "string 201") and the housing 203 which each string 201 are housed (insulation resistance of the measured object) It is configured. Specifically, as shown in FIG. 1, the insulation resistance measuring apparatus 1 includes a main body portion 2 and probes 3 and 3 configured to be connectable to the main body portion 2.

  As shown in FIG. 1, the main body 2 includes a power supply unit 11, a measurement unit 12, a control unit 13, an operation unit 14, a storage unit 15, and a display unit 16. The power supply unit 11 generates and outputs a measurement voltage V (for example, a DC voltage) according to the control of the control unit 13.

  The measurement unit 12 executes a measurement process for measuring the insulation resistance of the measurement object according to the control of the control unit 13. Specifically, the measurement unit 12 includes a current detection circuit 21, an A / D conversion circuit 22, and a measurement circuit 23. The current detection circuit 21 includes a plurality of switchable range resistors, and is configured to be able to switch the measurement range by switching the range resistors. The current detection circuit 21 converts the current I flowing between the probes 3 and 3 (measurement object) with the supply of the voltage V to the measurement object, and generates a voltage signal Sv. The A / D conversion circuit 22 performs analog-digital conversion on the voltage signal Sv generated by the current detection circuit 21 and outputs voltage data Dv. The measurement circuit 23 measures the insulation resistance of the measurement object based on the voltage data Dv output from the A / D conversion circuit 22 and the voltage value of the voltage V generated by the power supply unit 11 (hereinafter, measured) The value of the insulation resistance is also referred to as “measured value Rm”).

  When the major switch 43 (see FIG. 2) of the operation unit 14 is turned on and the operation signal So is output (when a measurement instruction is given), the control unit 13 executes the display process 50 shown in FIG. To do. Specifically, the control unit 13 controls the power supply unit 11 to output the measurement voltage V, and controls the measurement unit 12 to execute measurement processing to measure the insulation resistance of the measurement object. Further, the control unit 13 causes the storage unit 15 to store the measured value Rm of the insulation resistance measured by the measurement unit 12. Further, when the measurement value Rm is already stored in the storage unit 15 at the time when the measurement instruction is given, the control unit 13 determines the measurement value Rm already stored in the storage unit 15 (that is, by the previous measurement process). Measured measurement value Rm (hereinafter also referred to as “first measurement value Rm1”) and measurement value Rm newly measured by the measurement unit 12 (hereinafter also referred to as “second measurement value Rm2”) The average value Rma is calculated. Furthermore, the control unit 13 controls the display unit 16 to display the first measurement value Rm1, the second measurement value Rm2, the average value Rma, and the like (an example of a display value based on the measurement value measured by the measurement unit 12). Let

  As shown in FIG. 2, the operation unit 14 includes various switches such as a power switch 41, a range changeover switch 42, and a major switch 43 disposed on the front panel of the main body 2. When the is operated, an operation signal So (see FIG. 1) is output. The storage unit 15 stores the measurement value Rm last measured by the measurement unit 12 (the latest measurement value Rm) under the control of the control unit 13. That is, in this insulation resistance measuring apparatus 1, the storage unit 15 overwrites (rewrites) the measured value Rm with the latest one and stores only one. As an example, as shown in FIG. 2, the display unit 16 includes a liquid crystal display disposed on the front panel of the main body unit 2, and the first measurement value Rm <b> 1 and the second measurement value Rm <b> 2 are controlled by the control unit 13. And the average value Rma and the like are displayed.

  Next, a method for inspecting the quality of the solar cell 200 shown in FIG. 3 using the insulation resistance measuring apparatus 1 and the operation of the insulation resistance measuring apparatus 1 at that time will be described with reference to the drawings. In this case, in this inspection, the insulation resistance measuring apparatus 1 is used to measure the insulation resistance between the positive terminal 202a (see the same figure) and the housing 203 in each string 201 of the solar cell 200, and the negative electrode The insulation resistance between the terminal 202b on the side (see the figure) and the housing 203 is measured, and the average value Rma of both measured values Rm is compared with a predetermined reference value to determine whether the solar cell 200 is good or bad. To do.

  In this insulation resistance measuring apparatus 1, initialization processing is performed when the power switch 41 of the operation unit 14 shown in FIG. 2 is turned on. In this case, when the measured value Rm is stored in the storage unit 15, the measured value Rm is erased by the initialization process. Next, the range changeover switch 42 of the operation unit 14 is operated to select, for example, a measurement range of “100 to 1000 MΩ” as the measurement range. Subsequently, the insulation resistance between the positive terminal 202a and the housing 203 in one of the strings 201 in the solar cell 200 (for example, the string 201a shown in FIG. 3) is measured. Specifically, the probes 3 and 3 are brought into contact with the terminal 202a and the housing 203, respectively.

  Next, the major switch 43 of the operation unit 14 is turned on. At this time, the operation unit 14 outputs an operation signal So indicating a measurement instruction, and in response to this, the control unit 13 executes the display process 50 shown in FIG. In the display process 50, the control unit 13 controls the power supply unit 11 to output the measurement voltage V (step 51). Subsequently, the voltage V output from the power supply unit 11 is supplied (applied) to the terminal 202 a and the housing 203 via the probes 3 and 3. Next, the control unit 13 controls the measurement unit 12 to execute measurement processing (step 52). In this measurement process, the current detection circuit 21 of the measurement unit 12 converts the current I flowing between the probes 3 and 3 with the supply of the voltage V to generate a voltage signal Sv.

  Subsequently, the A / D conversion circuit 22 of the measurement unit 12 performs analog-digital conversion on the voltage signal Sv generated by the current detection circuit 21 and outputs voltage data Dv. Next, the measurement circuit 23 of the measurement unit 12 is connected between the terminal 202 a and the housing 203 based on the voltage data Dv output from the A / D conversion circuit 22 and the voltage value of the voltage V generated by the power supply unit 11. Measure the insulation resistance.

  Subsequently, the control unit 13 determines whether or not the measurement value Rm is already stored in the storage unit 15 (step 53). In this case, since the measurement value Rm is not stored in the storage unit 15 at this time, the control unit 13 controls the display unit 16 to perform measurement by the measurement unit 12 (measurement circuit 23) as shown in FIG. A measured value Rm (for example, 32.48 MΩ) of the measured insulation resistance is displayed (step 54). Next, the control unit 13 stores the measurement value Rm in the storage unit 15 as the first measurement value Rm1 (step 55). Subsequently, the control unit 13 repeatedly determines whether or not the major switch 43 has been turned off (step 56). When the major switch 43 has been turned off, the control unit 13 controls the power supply unit 11 to output the voltage V. While stopping, the measurement part 12 is controlled and a measurement process is stopped, and the display process 50 is complete | finished. Thus, the measurement of the insulation resistance between the terminal 202a and the housing 203 in the string 201a is completed.

  Next, the insulation resistance between the negative electrode side terminal 202b of the string 201a and the housing 203 is measured. Specifically, after the probes 3 and 3 are brought into contact with the terminal 202b and the housing 203, respectively, in the same manner as the procedure for measuring the insulation resistance between the terminal 202a and the housing 203 described above, the operation unit 14 measure switch 43 is turned on to give a measurement instruction (next measurement instruction). In response to this, the control unit 13 executes the display process 50.

  At this time, since the measured value Rm (first measured value Rm1) of the insulation resistance between the terminal 202a and the housing 203 is already stored in the storage unit 15, the control unit 13 In step 53, it is determined that the measured value Rm is already stored in the storage unit 15, and then the average value Rma is calculated (step 57). In this case, the control unit 13 reads the first measurement value Rm1 (in this example, 32.48 MΩ) from the storage unit 15, and as an example, the control unit 13 newly measures the first measurement value Rm1 and the measurement unit 12. The average value Rma (43.17 MΩ in this example) is calculated by simply averaging the second measurement value Rm2 (for example, 53.86 MΩ).

  Next, the control unit 13 controls the display unit 16 to display the first measurement value Rm1, the second measurement value Rm2, and the average value Rma as shown in FIG. 6 (step 58). Subsequently, the control unit 13 overwrites and stores the newly measured measurement value Rm (second measurement value Rm2) in the storage unit 15 as the first measurement value Rm1 (step 59). Next, the control unit 13 repeatedly determines whether or not the major switch 43 is turned off (step 56). When the major switch 43 is turned off, the control unit 13 controls the power supply unit 11 to stop the output of the voltage V. At the same time, the measurement unit 12 is controlled to stop the measurement process and the display process 50 is terminated. Thus, the measurement of the insulation resistance between the terminal 202b and the casing 203 in the string 201a is completed.

  Similarly, the insulation resistance between the terminal 202a and the housing 203 in the other string 201 is measured, and the insulation resistance between the terminal 202b and the housing 203 is measured. On the other hand, when the average value Rma in each string 201 is displayed as described above, the displayed average value Rma is recorded each time.

In this insulation resistance measuring apparatus 1, when the first measurement value Rm1 is already stored in the storage unit 15 when the measurement instruction is given, the second measurement value Rm2 newly measured by the measurement unit 12 and the storage unit 15 are stored. The average value Rma with the first measurement value Rm1 stored in the display unit 16 is displayed on the display unit 16. Therefore, as described above, when measuring the insulation resistance between the terminal 202a and the housing 203 in one string 201 and then measuring the insulation resistance between the terminal 202b and the housing 203, two measurements are performed. The average value Rma of the values Rm (first measurement value Rm1 and second measurement value Rm2) is automatically displayed on the display unit 16. For this reason, in this insulation resistance measuring apparatus 1, the measurement is performed twice when the insulation resistance between the terminal 202a and the housing 203 is measured and when the insulation resistance between the terminal 202b and the housing 203 is measured. Compared with the inspection method using the conventional insulation resistance measuring apparatus that needs to record the measured value Rm displayed for each time and further calculate the average value Rma from the measured value Rm. In addition, the inspection accuracy can be sufficiently improved.

  Next, when the recording of the average value Rma for all the strings 201 (measurement of the first measurement value Rm1 and the second measurement value Rm2) is completed, each average value Rma is compared with a reference value for pass / fail judgment. In this case, for example, when all the average values Rma of each string 201 are equal to or higher than the reference value, it is determined that the insulation state of the solar cell 200 is good, and even one string 201 whose average value Rma is lower than the reference value If it exists, it is determined that the insulation state of the solar cell 200 is defective.

  As described above, in this insulation resistance measuring apparatus 1, when the first measurement value Rm1 is already stored in the storage unit 15 at the time when the measurement instruction is given, the second measurement value Rm2 newly measured by the measurement unit 12 is stored. And the average value Rma of the first measurement value Rm1 stored in the storage unit 15 is displayed on the display unit 16. For this reason, in this insulation resistance measuring apparatus 1, after measuring the insulation resistance between the terminal 202a and the housing 203 in one string 201, the insulation resistance between the terminal 202b and the housing 203 is measured. The average value Rma of the two measured values Rm can be automatically displayed on the display unit 16. Therefore, according to this insulation resistance measuring apparatus 1, when measuring the insulation resistance of a measurement object having a polarity like the solar cell 200, the insulation resistance between the positive terminal 202a and the housing 203 is measured. In addition, it is not necessary to record the measured value Rm displayed every two measurements of the insulation resistance between the negative electrode side terminal 202b and the housing 203, and the measured values in these two measurements. As a result of being able to omit the complicated operation of calculating the average value Rma from Rm, the inspection efficiency and the inspection accuracy can be sufficiently improved.

  Moreover, in this insulation resistance measuring apparatus 1, the second measurement value Rm2 newly measured by the measurement unit 12 is displayed on the display unit 16 together with the average value Rma. For this reason, according to this insulation resistance measuring apparatus 1, since this insulation resistance measuring apparatus 1 can be used also for the test | inspection which requires 2nd measured value Rm with average value Rma, utilization of the insulation resistance measuring apparatus 1 is possible. The range can be expanded sufficiently.

  Further, in this insulation resistance measuring apparatus 1, the first measurement value Rm1 stored in the storage unit 15 is displayed on the display unit 16 together with the average value Rma. For this reason, according to this insulation resistance measuring apparatus 1, for example, a little time elapses after the first (previous) measurement until the second (next) measurement is performed. Even if it is unclear whether or not the current measurement has been performed (whether or not the current measurement is the second measurement), it is possible to ensure that the user is aware of this, so convenience is sufficient. Can be improved.

The configuration of the insulation resistance measuring device is not limited to the above configuration. For example, the configuration example in which the first measurement value Rm1, the second measurement value Rm2, and the average value Rma are displayed on the display unit 16 has been described above. However, only the average value Rma, only the average value Rma and the first measurement value Rm1, and the average value A configuration in which only Rma and the second measurement value Rm2 are displayed on the display unit 16 may be employed.

  In addition, the display mode when displaying the first measurement value Rm1, the second measurement value Rm2, and the average value Rma on the display unit 16 is not limited to the display mode described above (shown in FIG. 6). For example, as shown in FIG. 7, it is possible to employ a display mode in which the average value Rma is displayed large and the first measurement value Rm1 and the second measurement value Rm2 are displayed smaller than the average value Rma.

In the above configuration, when the measurement value Rm (first measurement value Rm1) is already stored in the storage unit 15 at the time when the measurement instruction is given, the measurement unit 12 newly adds the first measurement value Rm1 and the measurement unit 12. The average value Rma of the second measurement value Rm2 measured in the above is calculated and displayed on the display unit 16. As shown in FIG. 8, the first measurement value Rm1 and the second measurement value Rm2 are compared. The smaller value (minimum value Rms) of the two measured values Rm1, Rm2 and the larger value (maximum value Rml) of the two measured values Rm1, Rm2 are displayed on the display unit 16 together with the average value Rma. A configuration can also be adopted. Further, as shown in FIG. 9, a configuration in which the average value Rma and the minimum value Rms of both measured values Rm1, Rm2 are displayed without displaying the maximum value Rml of both measured values Rm1, Rm2, as shown in FIG. In addition, it is possible to adopt a configuration in which the average value Rma and the maximum value Rml of the two measurement values Rm1 and Rm2 are displayed without displaying the minimum value Rms of the two measurement values Rm1 and Rm2. That is, the display unit 16 displays at least one value of the average value Rma of the two measurement values Rm1 and Rm2, the minimum value Rms of the two measurement values Rm1 and Rm2, and the maximum value Rml of the two measurement values Rm1 and Rm2. Insulation resistance measuring device can be configured so that.

  Moreover, although it mentioned above about the example which measures the insulation resistance of the solar cell 200 using the insulation resistance measuring apparatus 1, various batteries other than the solar cell 200 (chemical batteries, such as a primary battery and a secondary battery), a capacitor, etc. The insulation resistance measuring device 1 can be used when measuring the insulation resistance of various electrical components. Moreover, this insulation resistance measuring apparatus 1 can also be used for the measurement of the insulation resistance between the conductor patterns in a circuit board, and the measurement of the resistance value of a conductor pattern (measurement of a conduction state).

DESCRIPTION OF SYMBOLS 1 Insulation resistance measuring apparatus 12 Measuring part 13 Control part 15 Memory | storage part 16 Display part 43 Major switch 200 Solar cell 201a-201n String 202a, 202b Terminal 203 Housing | casing Rm Resistance value Rm1 1st measured value Rm2 2nd measured value Rma Average value Rml Maximum value Rms Minimum value

Claims (3)

A measurement unit that measures the insulation resistance of the measurement object according to a measurement instruction, and a control unit that controls the display unit to display a display value based on the measurement value of the insulation resistance measured by the measurement unit on the display unit. Insulation resistance measuring device,
A storage unit for storing the measurement value last measured by the measurement unit;
When the measurement value is already stored in the storage unit at the time when the measurement instruction is given, the control unit newly adds the first measurement value as the measurement value stored in the storage unit and the measurement unit. Of the second measured value as the measured value, the smaller one of the first measured value and the second measured value, and the first measured value and the second measured value. Insulation resistance measuring device that causes at least one of the larger values to be displayed on the display unit as the display value and then overwrites and stores the second measured value as the first measured value in the storage unit . The insulation resistance measuring apparatus according to claim 1, wherein the control unit displays the newly measured value on the display unit together with the at least one value. The insulation resistance measuring apparatus according to claim 1, wherein the control unit displays a measurement value stored in the storage unit along with the at least one value on the display unit.

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