TW550388B - Apparatus for measuring insulation resistance of capacitor - Google Patents

Abstract

The purpose of the present invention is to measure the insulation resistance of a capacitor through a simple, quick and precise manner. The invented insulation resistance measuring apparatus is equipped with a variable and constant voltage power source, a volt meter, an intermittent circuit and a constant current supply circuit, a constant current drawing-in circuit, a capacitor under test, a current amplifier, an A/D converter and a calculation process part. The intermittent circuit and the constant current supply circuit output a current intermittently based on a voltage supplied from the power source. When a constant voltage is applied intermittently to the capacitor, a current flowing through the capacitor under test is amplified by the amplifier and is inputted in the A/D converter and the calculation process part, in which the A/D converter and the calculation process part convert the measured value of analog current to a digital measured-value, perform the calculation process, and output an insulation resistance value intermittently. As a result, the insulation resistance can be measured precisely in a short time.

Description

550388 A7 B7 5. Description of the invention (3) The current flowing through the device is used to find the insulation resistance 値 of the capacitor. As a result, the insulation resistance can be measured with the same accuracy as when the constant voltage is continuously applied. (Please read the precautions on the back before filling this page.) In the present invention, if the insulation resistance of a polarized capacitor is measured, a unipolar constant voltage is intermittently applied to the capacitor for measurement. In addition, in the present invention, in the case of measuring the insulation resistance of a non-polarized capacitor, a bipolar constant voltage is intermittently applied to the capacitor for measurement. Further, in the present invention, since a constant voltage of the same voltage level is constantly applied to the capacitor, the voltage level control is no longer required, and the configuration of the power supply can be simplified. In the present invention, since constant voltages of different voltage levels are intermittently applied to the capacitor, the insulation resistance characteristics of the capacitor can be measured in detail. In addition, in the present invention, a constant voltage is applied to the capacitor after the measurement terminal is brought into contact with the electrode terminal of the capacitor, and the measurement terminal is detached after the measurement is completed, so that the occurrence of sparks in the measurement terminal can be reliably prevented. Extend the life of the measurement terminal. Printed by the Intellectual Property of the Ministry of Economic Affairs ^ Employee Consumer Cooperative, the present invention includes a power source that intermittently applies a constant voltage to a capacitor, and intermittently measures the current flowing in the capacitor while a constant voltage is applied to the capacitor. And a resistance measuring device that intermittently obtains the insulation resistance 値 of the capacitor based on the measured current 定 and constant voltage 値 and determines the insulation resistance 値 based on the resistance measurement device. Good or bad judgment device. In addition, according to the present invention, because the capacitor is intermittently applied with a constant voltage, the paper size is subject to the Chinese National Standard (CNS) A4 specification (210X297 mm) ′ -6-550388 A7 _ B7_ _ V. Description of the invention (4) As a result, the determination of the good or bad of the capacitor can be slightly as accurate as in the case of continuous application, and the determination result can be obtained in a short time. (Please read the precautions on the back before filling this page.) In the present invention, because the initial insulation resistance 过渡 includes a transition state, the error is relatively small. According to the Current, find the insulation resistance 値 of the capacitor. This makes it possible to measure the insulation resistance with the same accuracy as when a constant voltage is continuously applied. Further, in the present invention, since a current sink device capable of absorbing excess current is provided, a constant voltage can be reliably applied to the capacitor. In addition, in the present invention, since the equivalent impedance (imp edanc e) on the power supply side is made to be slightly zero ohms, and the input impedance of the current amplifier that amplifies the current flowing in the capacitor is reduced, it is difficult to suffer from external hybrid echo (cl u 11 erech 〇), the measurement terminal for voltage application can be made with unshielded or unprotected electrode structure. Further, in the present invention, the charge in the charger is discharged in synchronization with the application of a constant voltage intermittently, so that it can be discharged in a short time. Printed by the Intellectual Property of the Ministry of Economic Affairs ^ Employee Consumer Cooperative. In the present invention, the discharge device measures the current flowing when the charged charge in the capacitor is discharged, and judges the good or bad of the capacitor based on the measurement result. Good or bad judgment is performed effectively within time [Simplified description of the drawing] Figure 1: The schematic structure of the insulation resistance measuring device of the capacitor of the present invention is shown. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 550388 A7 B7 V. Description of the invention (5) Figure 2: Diagram showing the change in the resistance of a capacitor over time when a DC voltage is continuously applied to the capacitor . Fig. 3 is a graph showing the change in the resistance of the capacitor with time when a DC voltage is intermittently applied to the capacitor. Figure 4: A block diagram showing a schematic configuration of a current measure uni t. Figure 5: The solid line L 1 represents the insulation resistance characteristics of a good product, and the dotted line L 2 represents the insulation resistance characteristics of a defective product. Fig. 6 is a flow chart of a capacitor measuring device for applying, measuring, and determining a unipolar voltage, that is, a voltage having only a positive polarity. Fig. 7 is a diagram showing the structure of a turntable. FIG. 8 is a diagram showing an example of the measurement sequence of FIG. 6. Fig. 9 is a flowchart showing the processing of a capacitor measuring device for applying, measuring, and determining a bipolar voltage. Fig. 10: A flowchart of a processing method for a capacitor measuring device for applying and measuring a bipolar voltage. Fig. 11: Enlarged views showing the structure of the terminal electrode portion of the capacitor measuring device shown in Figs. 6, 9, and 10. Fig. 12: A diagram showing the relationship between the measurement terminal and the timing of the voltage applied to the test capacitor. Fig. 13: A block diagram showing the detailed configuration of the discharge section in Figs. 6, 9, and 10; The main component comparison table This paper size applies to Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling out this page) and then fill in the printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs-8 -550388 A7 B7 V. Description of the invention (6 circuits of the Ministry of Electric Power Supply for the calculation of the source current meter circuit and the voltage regulator electrical and receiver change the fixed circuit suction capacity changes. Meter current discharge D variable voltage continuous power test current \ Can be determined by electric power A ···· ** · · · · · · 1 2 3 4 5 6 7

IX IX

Electricity D position system and source clamp measurement and control D part flow pressure flow type \

Switching A

Output, input, body, input, memory, display, and display of the display interface 6 7 8 9 Η 1—Η 1—I (Please read the precautions on the back before filling out this page) Printed by Intellectual Property of the Ministry of Economics ¾ Printed by Employee Consumer Cooperatives

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L 2 2 2 Good non-missing ball line transferability, special resistance, electrical resistance, excellent product, good fight β, mold sound material, feed type, off-disk, paper size, applicable Chinese national standard CN (CNS) A4 specification (210X297 mm) -9-550388 A7 ____B7_ V. Description of the invention (8) The insulation resistance characteristic with a slope like the insulation resistance increases. In addition, T1, T2, and T3 in Figure 3 indicate the voltage application period (please read the precautions on the back before filling this page). These T 1 'T 2' T 3 need not necessarily be at the same time interval. In this embodiment, "the constant voltage is applied intermittently to the capacitor as in the case of continuous application" and the insulation resistance is measured in the same manner as in the case of continuous application. Further, "in this embodiment", a constant voltage application method is used instead of the current resistance charging method, and the insulation resistance 値 immediately after the application of a voltage from a constant current is measured. In the method of constant voltage application, since there is no fixed number of current limiting resistors 値 and electrostatic capacity 如 such as the resistance charging method, the voltage rise time immediately after the constant current period immediately after the voltage is applied can be ignored. Therefore, the insulation resistance at a constant voltage can be accurately measured. As a method of measuring the insulation resistance of a capacitor according to a constant voltage application method, there are a case where an insulation resistance intermittent measurement circuit as shown in FIG. 1 is used, and a case where a current source measurement unit as shown in FIG. 4 is used. The insulation resistance intermittent application measurement circuit printed by the Intellectual Property of the Ministry of Economic Affairs and the Employees' Cooperative Cooperative Society is provided with: variable and constant voltage power supply 1, and voltmeter 2, and intermittent circuit and constant current supply circuit 3. Constant current Absorptive circuit 4, test capacitor 5, current amplifier 6, and A / D (analog / digital) converter and calculation processing section 7, test capacitor determined by the A / D converter and calculation processing section 7 5. Good or bad judgment unit 8 of insulation resistance 値. The discontinuous circuit and constant current supply circuit 3 in FIG. 1 output current intermittently based on the voltage 'supplied from the variable / constant voltage power supply 1. The constant current sink circuit 4 will absorb the current flowing in the circuit when the test capacitor 5 becomes a constant voltage state. Current flowing in the test capacitor 5 'This paper size applies the Chinese National Standard (CNS) A4 specification (21〇 > < 297 mm) -11-550388 A7 B7 V. Description of the invention (9) will be used by the current amplifier 6 is amplified and supplied to the A / D converter and calculation processing unit 7. (Please read the precautions on the back before filling in this page.) The A / D converter and calculation processing unit 7 converts the analog current measurement 为 into a digital measurement ， and then performs calculation processing to output the insulation resistance 値 if it is applied intermittently In the case of DC voltage, because there is a correlation between the insulation resistance 规定 after a predetermined time at the intermittent application and the insulation resistance 时 at the intermittent application, the insulation resistance can be measured based on the constant application of the constant voltage only for a short time. , To determine the good or bad insulation resistance. On the other hand, the current source measurement unit in FIG. 4 includes a current source 1 1 and a voltage clamp circuit 1 2, and a current meter 1 3, and a voltage meter 2, a voltage clamp circuit 1 2, a voltage meter 2, and a power supply. The test capacitor 5 is connected in parallel to the current source 1 1. The current 値 output from the current source 11 is controlled by the microcontroller 1 4. The current flowing through the test capacitor 5 is input to the microcontroller via the A / D and D / A converters 15. The microcontroller 14 calculates the insulation resistance of the test capacitor 5 and stores the calculation result in the memory printed by the Intellectual Property of the Ministry of Economic Affairs and the Employee Consumer Cooperative. In addition, the microcontroller 14 is connected to a keyboard and a display 17 for inputting measurement conditions or displaying a measurement result, and a bus between the microcomputer 14 and an IEEE (American Society of Electrical and Electronics Engineering) 4.8 bus. Interface section 1 and trigger input and output section The paper size is applicable to Chinese National Standard (CNS) A4 specifications (210 X 297 mm) -12- 550388 A7 _ B7 V. Description of the invention (10) ( Please read the precautions on the back before filling this page.) The solid line L 1 in Figure 5 is the insulation resistance characteristic of the good product, and the dotted line L 2 is the insulation resistance characteristic of the defective product. Insulation resistance 后, that is, 60 seconds 不良 after a specified time is a defective test capacitor 5 can be easily judged as good or bad during intermittent application of a DC voltage, for example, in 200 milliseconds. Fig. 6 is a flow chart showing the processing of a capacitor measuring device for applying, measuring, and determining a unipolar voltage, that is, a voltage having only a positive polarity. The application example of the device in Fig. 6 includes: polarized capacitors (giant electrolytic capacitors, brocade electrolytic capacitors, etc.), non-polarized general capacitors (multipurpose multilayer magnetic capacitors, etc.), etc. . The test capacitor 5 is supplied to the work station 4 2 of the turntable 41 shown in Fig. 7 through the funnel 21, the ball feeder 2 2, the linear feeder 2 3, and the separation supply unit 24. Here, the work station 4 2 is formed by penetrating the outer peripheral portion of the disk-shaped turntable 4 1 in the axial direction of the turntable 41. The turntable 4 1 supplied with the supply capacitor 5 is intermittently rotated at a high speed and stopped at the arrangement pitch of each work station 4 2. Printed on the intermittent rotation of the turntable 41 by the Intellectual Property Co., Ltd. employee ’s consumer cooperative, first, the first capacity meter 51 is used to determine the electrostatic capacity and dielectric loss tangent of the capacitor 5 under test (dieletric loss tangent) ( Symbol 2 5). Next, the first insulation resistance meter 52 was used to measure the first low-voltage insulation resistance of the test capacitor 5 (Subject No. 2 6). Next, the second insulation resistance meter 5 3 was used to measure the low-voltage insulation resistance (symbol 2 7) of the capacitor 5 to be tested. When measuring the 1st and 2nd low-voltage insulation resistance, the paper size used for the insulation resistance meter applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) -13- 550388 A7 B7 V. Description of the invention (11 ) Source 5 4, applying a voltage of, for example, 1 to 10 volts. Here, the first insulation resistance meter 5 2 and the second insulation resistance meter 5 3 in FIG. 6 are intermittently applied to the measurement circuit by the insulation resistance shown in FIG. 1 or the power supply current measurement shown in FIG. 4. Units. Next, the withstand voltage of the test capacitor 5 was measured using the first insulation resistance meter 5 2 (symbol 2 8). Here, depending on the application, a power source 5 4 for an insulation resistance meter is used, and a voltage of, for example, a maximum of 700 volts is applied. Next, the first insulation resistance meter 52 was used to measure the first insulation resistance of the test capacitor 5 (symbol 2 9). Next, the second insulation resistance meter 53 was used to measure the second insulation resistance of the test capacitor 5 (symbol 30). Next, the second insulation resistance meter 53 was used to measure the third insulation resistance (symbol 3 1) of the test capacitor 5. For the measurement of the first to third insulation resistances, depending on the application, a power source 54 for insulation resistance is used, and a voltage of, for example, a maximum of 700 volts is applied. Next, the test capacitor 5 was discharged (symbol 3 2), and the insulation resistance was measured by using the first insulation resistance meter 5 3 for the measurement of the discharge current. Next, using the second capacity meter 5 5, the capacitance and the dielectric loss tangent of the test capacitor 5 were measured (symbol 3 3). Here, the discharge of the test capacitor 5 is not performed after the second low-voltage insulation resistance measurement is performed and the withstand voltage application measurement is performed. Similarly, the discharge of the test capacitor 5 is not performed after the withstand voltage measurement is performed until the first insulation resistance measurement is performed. Usually, the withstand voltage measurement voltage is set higher than the insulation measurement voltage. In addition, if you want to measure the first insulation resistance, first move in the constant current sink circuit 4. This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm)

Re-enter I: Write this page} Intellectual property of the Ministry of Economic Affairs ^ 7 Printed by employee consumer cooperatives 14-550388 A7 _____B7 V. Description of the invention (12) When it is in a constant voltage state after measurement, measure the insulation resistance. (Please read the precautions on the back before filling this page.) As a reason for measuring the low-voltage insulation resistance twice, for example, the capacitance of the dielectric loss tangent of the first capacity meter 51 at lKHz and lVrms is measured. Capacitor 5 may have a residual charge of up to ± 1.4 volts, and the first low-voltage insulation resistance measurement 値 will be the main application for deviation short-circuit detection. If the measurement of the capacitance and dielectric loss tangent in Figure 6 is completed, then the defective products are discharged (symbol 2 4), and the good products are classified and discharged according to the type (symbols 35 to 40). FIG. 8 is a diagram showing an example of the measurement sequence of Table 6 in Table City. In Fig. 8, the horizontal axis represents time, and the vertical axis represents voltage 値. As shown in Fig. 8, during the second low-voltage insulation measurement, "the voltage application period is shorter than that of the first low-voltage insulation measurement." The voltage application time during resistance measurement is short. Furthermore, at the time of the withstand voltage measurement, a higher voltage is applied than during the measurement of the first to third insulation resistances. Printed by the Intellectual Property of the Ministry of Economic Affairs and the Consumer Consumption Cooperative. On the other hand, Figure 9 is a processing flow chart of a capacitor measuring device that applies, measures, and determines bipolar voltage. In the processing flow of Fig. 9, a bipolar voltage of a positive polarity and a negative polarity is applied, and a withstand voltage measurement and an insulation resistance measurement are performed. The application example of the device in Figure 9 is a relatively small-capacity (less than 1 // F) surface-mounted multilayer magnetic capacitor, and the insulation resistance 値 measurement will be performed once for each polarity. In Fig. 9, the same processing and configuration as in Fig. 6 are assigned the same reference numerals. In the capacitor measuring device in Figure 9, the positive voltage withstand voltage is measured. The paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) " -15- 550388 A7 B7 V. Description of the invention (13) ( Please read the precautions on the back before filling in this page.) After the measurement and insulation resistance measurement (symbols 6 1, 6 2), perform the negative voltage withstand voltage measurement and insulation resistance measurement (symbols 6 3, 6 4). After the test capacitor 5 is discharged (symbol 3 2), the capacitance and the dielectric loss tangent are measured (symbol 3 3). Next, after the defective products are discharged (symbols 65 to 67), the good products are bundled and packed (symbol 6 8) and discharged (symbols 40). As shown in Figure 9, due to the effect of the application of a bipolar electrode, the dielectric polarization will be neutralized, and there will be no residual charge. Even if it is bundled and packaged, it will not be caused by the residual charge. The problem. In addition, it is possible to easily detect a defective product having an insulation resistance abnormality only for a certain polarity. Fig. 10 is a processing flow chart of a capacitor measuring device for applying and measuring a bipolar voltage. The application example of the device in Fig. 10 is a non-polarized capacitor, particularly a multilayer magnetic capacitor having a large capacity of 1 // F or more. Others can also be used for the measurement of multilayer film capacitors. The Intellectual Property of the Ministry of Economics ¾ The capacitor measuring device printed in Figure 10 by the employee consumer cooperative measures the measurement of the first and second low-voltage insulation resistances (symbols 2 6, 2 7) and applies force to the test capacitor 5 For the low voltage of the positive polarity, the positive polarity withstand voltage measurement (symbol 6 1) and the first to third positive polarity insulation resistance measurements (symbols 7 1 to 7 3) were performed in this order. The positive polarity withstand voltage measurement and the first and second positive polarity insulation resistance measurements were performed using a second insulation resistance meter 94, and the third positive polarity insulation resistance measurement was performed using a third insulation resistance meter 95. Next, a constant voltage of a negative polarity is applied to the test capacitor 5, and a negative polarity withstand voltage measurement (symbol 6 4) and a first to a third negative polarity insulation resistance measurement (symbols 7 4 to 7 6) are sequentially performed. Next, the paper size for the test is applicable to the Chinese national standard (CNS) A4 specification (210X297 mm) -16- 550388 A7 B7 V. Description of the invention (14) (Please read the precautions on the back before filling this page) After the container 5 is discharged (symbol 32), the second capacitance meter 55 is used to measure the capacitance and dielectric loss tangent of the test capacitor 5 (symbol 3 3). Next, proceed in order: the first discharge of defective products of capacitance and dielectric loss tangent (symbol 7 7), the discharge of defective products of low voltage insulation resistance (symbol 7 9), the second and third times Defective discharge of positive insulation resistance (symbol 8 0), 2nd and 3rd discharge of defective goods of negative insulation resistance (symbol 8 1), 2nd time of capacitance and dielectric loss tangent Discharge of good products (symbol 8 2), defective discharge of pins (symbol 8 3), discharge of good products (symbol 8 4), and various processes of discharge (symbol 8 5). FIG. 11 is an enlarged view showing the structure of the terminal electrode portion of the capacitor measuring device shown in FIGS. 6, 9 and 10, and shows the application of the terminal electrode 91 of the capacitor 5 for surface mounting. When the measurement terminal (wire-type probe, wire-pr) 9 2 for voltage application is in contact. One end of the measuring terminal 9 2 is in contact with the terminal electrode 9 1, and the other end is the intellectual property of the Ministry of Economic Affairs ^ The printing department of the employee consumer cooperative is connected to the discontinuous circuit and fixed circuit of FIG. 1 through the coaxial circuits 9 3 and 9 4 respectively. Current supply circuit 3 and current amplifier 6. The capacitor 5 is placed on top of the high insulator 95, and a high insulator 95 is also provided near the middle of one end side and the other end side of the measurement terminal 92. As shown in Figure 11, the measurement terminals are not shielded and there are no protective electrodes. The reason that no shielding or protective electrode is needed is because the equivalent impedance on the power supply side will become slightly zero ohms due to the use of a constant voltage power supply, and because the current amplifier 6 with a low input impedance is used, the whole system will not The paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm 1 -17-550388 A7 B7) V. Description of the invention (15) Affected by external disturbance, it can be used to measure and reproduce the ultra-high resistance. Practically. The implementation mode can be actually measured to the level of megaohms. (Please read the precautions on the back before filling out this page.) Figure 12 shows the timing of measuring the voltage of terminal 92 and the voltage applied to test capacitor 5. As shown in the figure, after the measurement terminal 92 contacts the terminal electrode 91 of the test capacitor 5 in a stable manner, a voltage is applied to the test capacitor 5 and measured, and thereafter, due to the application of the voltage and After the measurement is completed, the measurement terminal 92 can be separated from the terminal electrode 91 of the capacitor 5 to protect the measurement terminal 90 from being damaged by the spark and achieve the durability of the measurement terminal 92. Figure 13 A block diagram showing the detailed structure of the discharge section in Figs. 6, 9, and 10. As shown in this figure, the discharge section 32 is a circuit for measuring the intermittent application of the insulation resistance by omitting the first diagram. The structure of the variable and constant voltage power supply 1 and the intermittent circuit and constant current supply circuit 3. If the capacitor 5 is discharged, it will first become a constant current state, and the discharge current will be reduced in a short period of time. The voltage is used as a reference for the measurement of the resistance 値, and based on the measurement results, it can be determined whether the discharge is completed normally, and at the same time, the contact state of the measurement terminal 92 can be determined. Applicable to China National Standard (CNS) A4 specification (210X297 mm) -18-

Claims (1)

V '* ο 5 5 Mingniu 4: A8 B8 C8 D8 Following 3. Year &month; "Tn; l > L > VI. Patent Application No. 901 1 8220 Chinese Patent Application Amendment (Please first (Please read the precautions on the back and fill in this page again.) March 6, 1992 A capacitor insulation measurement device for correction capacitors, which is characterized by having a power supply that intermittently applies a constant voltage to the capacitor, and applying a constant voltage to the capacitor. A current measuring device for intermittently measuring the current flowing in the capacitor under the condition of the resistance, and a resistance measuring device for intermittently determining the insulation resistance of the capacitor based on the measured current 定 and constant voltage 値, and based on The insulation resistance 値 obtained by the resistance measuring device is a determining device for determining whether the capacitor is good or bad. 2 · As for the insulation resistance measuring device of the capacitor in item 1 of the scope of patent application, wherein the above-mentioned resistance measuring device is after the power source starts to apply a voltage intermittently to the capacitor, wait until the voltage across the capacitor becomes a constant voltage. Find the insulation resistance 値 of the capacitor. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs3. If the insulation resistance measuring device of the capacitor in item 1 of the patent application scope is provided, after the two ends of the capacitor become a constant voltage, the method of no electricity flowing in the capacitor is used. Current sinking device that absorbs current. 4 · The insulation resistance measuring device according to item 1 of the scope of patent application, wherein the measuring terminal for applying a voltage to the electrode terminal of the aforementioned capacitor has an unshielded or unprotected electrode structure. 5 · If the insulation resistance measuring device of item 1 of the scope of patent application, the paper size is applicable to China National Standard (CNS) A4 specification (210X 297 mm) 550388 6. The scope of the patent application is equipped with a discharge device that discharges the charge in the aforementioned capacitor that is charged due to the intermittent application of a constant voltage. (Please read the precautions on the back before filling this page.) The aforementioned discharge device is The charging charge in the charger is discharged in synchronization with the intermittent application of a constant voltage by the power supply. 6 · If the insulation resistance measuring device according to item 5 of the patent application scope, wherein the current measuring device measures the current flowing when the discharging device discharges the charge in the capacitor, the determining device is based on the The final constant voltage 最后 applied to the capacitor and the current measured by the current measuring device at that time are used to determine the good or bad of the capacitor. 7 · The insulation resistance measuring device according to item 5 of the scope of patent application, wherein the above-mentioned resistance measuring device is to intermittently obtain the above-mentioned power source by applying a constant voltage of either the positive polarity or the negative polarity to the capacitor. Capacitor insulation resistance 値. '8 · If the insulation resistance measurement of the capacitor in item 5 of the scope of the patent application is printed by a consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, the above-mentioned resistance measurement device is a device that intermittently applies the same voltage level to the capacitor In constant voltage, the insulation resistance 値 of the aforementioned capacitor is obtained intermittently. 9 · The insulation resistance measuring device of a capacitor according to item 5 of the scope of patent application, wherein the resistance measuring device is obtained intermittently by the power supply intermittently applying constant voltages of different voltage levels to the capacitor. The insulation resistance 値 of the aforementioned capacitor. 1 〇 · If the insulation resistance measuring device of the capacitor in item 5 of the scope of patent application, the aforementioned power supply is a measuring terminal for applying a constant voltage. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm)- 2 - A8 B8 C8 D8 550388, after applying for a patent, contact the electrode terminals of the capacitor, apply a constant voltage to the capacitor intermittently, and the resistance measuring device makes the measurement of the current flowing in the capacitor after the measurement is completed. The measurement terminal is separated from the electrode terminal of the capacitor. (Please read the precautions on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -3-