KR20040001124A - Multi-functional over-current relay for durability test of capacitor - Google Patents

Multi-functional over-current relay for durability test of capacitor Download PDF

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Publication number
KR20040001124A
KR20040001124A KR1020020036218A KR20020036218A KR20040001124A KR 20040001124 A KR20040001124 A KR 20040001124A KR 1020020036218 A KR1020020036218 A KR 1020020036218A KR 20020036218 A KR20020036218 A KR 20020036218A KR 20040001124 A KR20040001124 A KR 20040001124A
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South Korea
Prior art keywords
capacitor
relay
short
current
power
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KR1020020036218A
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Korean (ko)
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유동수
송옥병
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대우전자주식회사
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Priority to KR1020020036218A priority Critical patent/KR20040001124A/en
Publication of KR20040001124A publication Critical patent/KR20040001124A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

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  • Emergency Protection Circuit Devices (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)

Abstract

PURPOSE: A multifunctional overcurrent relay for testing durability of a capacitor is provided to display easily a current value, an overtime value, a short value, and a leakage current value according to an operation of the multifunctional overcurrent relay by using a display device. CONSTITUTION: A multifunctional overcurrent relay for testing durability of a capacitor includes a terminal portion(60), a fuse/leakage current circuit breaker(10), a current meter(30), a micro computer(40), and an output terminal(50). The terminal portion(60) receives the power from a power switch(PS) and supplies the driving power to each component. The fuse/leakage current circuit breaker(10) is connected to the terminal portion(60) to prevent the overload and the leakage current. The current meter(30) is used for measuring a current value within the relay by using the power of the terminal portion(60). The micro computer(40) is used for displaying the current value, an overtime value, a short value, and a leakage current value according to an operation of the relay. The output terminal(50) is used for connecting electronic components to each other.

Description

캐패시터 내구성 시험용 다기능 과전류 계전기{Multi-functional over-current relay for durability test of capacitor}Multi-functional over-current relay for durability test of capacitor

본 발명은 캐패시터 내구성 시험용 다기능 과전류 계전기에 관한 것으로, 더욱 상세하게는 각종 전자제품 및 그 부품들을 항온장치 내에 전원이 공급되도록 장착하고, 상기 시험하고자 하는 제품 및 부품들의 전류, 오버타임, 쇼트 및 누설전류 등을 설정하여 기 제품 및 부품들의 내구성을 시험을 위한 다기능 과전류 계전기에 관한 것이다.The present invention relates to a multifunctional overcurrent relay for capacitor durability testing, and more particularly, to mount various electronic products and their components so that power is supplied to the thermostat, and to check the current, overtime, short and leakage of the products and components to be tested. The present invention relates to a multifunctional overcurrent relay for testing the durability of existing products and components by setting current.

일반적으로 과전류 계전기는 각종 전자제품 및 그 부품들의 가속수명시험(신뢰성시험)하기 위하여 실 사용조건보다 가혹한 조건(온도, 습도, 진동, 전압, 전류) 또는 사용율을 높여 시험하고, 빠른 시간내에 설정 완성도를 평가하거나 수명(신뢰도)을 평가하기 위한 시험이다. 이는 짧은 시간내에 수명에 관한 더 많은 정보를 수집하여 사용조건에서의 수명을 빠른 시간내에 추정이 가능하며, 개발검증 및 양산검증 시험의 평가와 납기단축, 신속한 신뢰성 평가 및 확인 잠재적 고장모드, 설계의 약점을 드러나게 하는 시험방법이다.In general, overcurrent relays are tested for harsh conditions (temperature, humidity, vibration, voltage, current) or higher utilization than actual conditions for the accelerated life test (reliability test) of various electronic products and their components. This is a test for evaluating or evaluating the lifetime (reliability). It can collect more information about lifespan in a short time and estimate the lifespan in use condition in a short time. It can evaluate and shorten the time of development verification and mass production verification test, shorten the timely reliability evaluation and confirmation potential failure mode, design A test that reveals weaknesses.

그러나, 상기와 같이 가속수명시험을 하기 위한 과전류 계전기는 아직 정형화된 장치가 없으며, 기 사용되고 있는 과전류 계전기는 단순히 각 전자제품 및 그 부품의 시험하고는 있는 상태 즉, 정상상태와 전류 및 과부하 등을 램프로 표시하는 것으로, 전자제품 및 그 부품들의 전류, 오버타임, 쇼트 및 누설전류 등을 육안으로 확인할 수 없는 문제점을 내포하고 있다.However, the overcurrent relay for the accelerated life test as described above does not yet have a formalized device, and the overcurrent relay that is being used is simply a test state of each electronic product and its components, that is, the steady state, current and overload, etc. Displaying with a lamp includes a problem that the current, overtime, short and leakage current of electronic products and their parts cannot be visually checked.

상기와 같은 문제를 해소하기 위한 것으로, 본 발명은 각종 전자제품 및 그 부품들을 항온장치 내에 전원이 공급되도록 장착하고, 상기 시험하고자 하는 제품 및 부품들의 전류, 오버타임, 쇼트 및 누설전류 등을 설정하여 기 제품 및 부품들의 내구성을 시험하기 위한 다기능 과전류 계전기를 제공하는데 그 목적이 있다.In order to solve the above problems, the present invention is to install a variety of electronic products and their components so that the power supply in the thermostat, and set the current, over time, short and leakage current of the products and components to be tested The purpose is to provide a multifunctional overcurrent relay for testing the durability of the products and components.

도 1은 본 발명에 따른 캐패시터 내구성 시험용 다기능 과전류 계량기의 개략적인 구성도.1 is a schematic diagram of a multifunctional overcurrent meter for capacitor durability test according to the present invention.

도 2는 본 발명에 따른 캐패시터 내구성 시험용 다기능 과전류 계량기에서의 마이컴 내부 구성도.Figure 2 is a microcomputer internal configuration of the multifunction overcurrent meter for capacitor durability test according to the present invention.

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

10 : 누전차단기20 : 전자스위치10: leakage circuit breaker 20: electronic switch

30 : 전류계40 : 마이컴30: ammeter 40: microcomputer

50 : 출력단자60 : 단자대50: output terminal 60: terminal block

PS : 전원스위치RS : 리셋스위치PS: Power switch RS: Reset switch

R : 릴레이R: Relay

본 발명을 이루기 위한 수단으로, 상기 전원스위치로부터 입력된 전원을 각 구성요소들의 구동전원을 공급하는 단자대와; 상기 단자대에 연결되어 과부하 및 누전을 방지하는 퓨즈/누전차단기와; 상기 단자대로부터 공급된 전원에 의해 계전기 내의 전류 값을 측정하는 전류계와; 상기 전류 값을 토대로 캐패시터와 같은 전자부품의 내구성을 시험하기 위해 전류, 오버타임, 쇼트 및 누설전류의 가속조건을 설정하며, 상기 계전기의 작동에 따른 전류, 오버타임, 쇼트 및 누설전류 값을 표시하는 마이컴 및; 상기 캐패시터와 같은 전자부품을 연결하는 출력단자를 포함하는 것을 특징으로 한다.Means for achieving the present invention, the terminal block for supplying the drive power of the respective components to the power input from the power switch; A fuse / leakage circuit breaker connected to the terminal block to prevent an overload and a short circuit; An ammeter for measuring a current value in the relay by the power supplied from the terminal block; Based on the current value, acceleration conditions of current, overtime, short and leakage current are set to test the durability of an electronic component such as a capacitor, and current, overtime, short and leakage current values are displayed according to the operation of the relay. A microcomputer and; And an output terminal for connecting an electronic component such as the capacitor.

바람직하게는, 상기 마이컴에는 전류, 오버타임, 쇼트 및 누설전류 값을 각각 조절하는 조절밸브와; 상기 각 조절밸브에 의해 조절되는 전류, 오버타임, 쇼트, 누설전류 값 및 계전기의 작동상태를 표시하는 표시수단이 더 포함되도록 하고, 상기 캐패시터가 상기 마이컴의 조절밸브에 의해 기 설정된 전류, 오버타임, 쇼트 및 누설전류 값 이상의 값이 발생하게 되면 구동전원을 차단하기 위한 전자스위치가 더 포함되도록 하며, 상기 누전차단기 및 전자스위치가 과부하 및 누전 등에 의해 전원이 차단된 경우 상기 계전기를 초기화시키기 위한 리셋스위치를 더 포함하는 것을 특징으로 한다.Preferably, the microcomputer includes a control valve for regulating current, overtime, short and leakage current values; Display means for displaying the current, over time, short, leakage current value and the operating state of the relay controlled by each control valve is further included, wherein the capacitor is a current, over time preset by the control valve of the microcomputer In addition, when a value greater than the short and leakage current values is generated, an electronic switch for cutting off the driving power is further included.In addition, a reset for initializing the relay when the power circuit breaker and the electronic switch are cut off due to an overload or a short circuit It further comprises a switch.

이하, 본 발명의 바람직한 실시 예를 첨부된 도면을 참조하여 상세하게 살펴보면 다음과 같다.Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 캐패시터 내구성 시험용 다기능 과전류 계량기의 개략적인 구성도 이다.1 is a schematic configuration diagram of a multifunctional overcurrent meter for capacitor durability test according to the present invention.

도 2는 본 발명에 따른 캐패시터 내구성 시험용 다기능 과전류 계량기에서의 마이컴 내부 구성도 이다.2 is an internal configuration diagram of the microcomputer in the multifunctional overcurrent meter for capacitor durability test according to the present invention.

도 1 및 도 2에 도시된 바와 같이, 다기능 과전류 계전기는 외부 전원공급수단으로부터 전원을 공급받아 작동되고, 상기 계량기는 전원스위치(PS), 리셋스위치(RS), 단자대(60), 릴레이(R), 퓨즈/누전차단기(10), 전자스위치(20), 전류계(30), 마이컴(40) 및 출력단자(50)로 구성된다. 또한, 마이컴(40)에는 전류, 오버타임, 쇼트 및 누설전류 값을 각각 조절하는 조절밸브(41)와 상기 계량기의 작동에 따른 작동상태 및 각 조절밸브(41)에 의해 조절되는 전류, 오버타임, 쇼트, 누설전류 값을 표시하는 표시수단(42)이 더 포함된다.As shown in Figure 1 and 2, the multi-function overcurrent relay is operated by receiving power from an external power supply means, the meter is a power switch (PS), a reset switch (RS), a terminal block 60, a relay (R) ), A fuse / leakage circuit breaker 10, an electronic switch 20, an ammeter 30, a microcomputer 40, and an output terminal 50. In addition, the microcomputer 40 has a control valve 41 for adjusting the current, over time, short and leakage current values, and the operating state according to the operation of the meter and the current and over time controlled by each control valve 41. And display means 42 for displaying a short and a leakage current value.

캐패시터 등과 같은 전자제품 및 그 부품의 내구성 시험은 항온실에 상기 캐패시터를 전원이 공급되게 설치하고, 상기 계전기의 출력단자(50)에 캐패시터 등과 같은 각 전자제품 및 그 부품 등을 연결하며, 전원스위치(PS)를 눌러 외부의 전원공급수단으로부터 전원을 공급받아 계전기를 작동시켜 상기 계전기의 부하 즉, 캐패시터의 작동에 다른 전류 값 및 미세 누설전류 등을 먼저 확인하고, 상기 마이컴(40)의 조절밸브(41)를 통해 전류, 오버타임, 쇼트 및 누설전류 값보다 높게 설정하여 설정된 값보다 캐패시터의 내구성을 시험하게 되는 것이다.Durability test of electronic products such as capacitors and components thereof is such that the capacitors are supplied with power in a constant temperature room, and each electronic product such as capacitors and the like are connected to the output terminal 50 of the relay, and a power switch Press (PS) to operate the relay by receiving power from an external power supply means to check the current value and the fine leakage current, which are different from the load of the relay, that is, the capacitor, and then, the control valve of the microcomputer 40. By setting the value higher than the current, over time, short and leakage current value through (41) to test the durability of the capacitor than the set value.

즉, 계량기의 전원은 전원스위치(PS)의 접점이 온될 때 공급되며, 상기 전원스위치(PS)의 접점을 경유하여 공급된 전원은 단자대(60)에 입력되고, 상기 단자대(60)에 입력된 전원은 각 구성요소들의 구동전원으로 공급된다.That is, the power of the meter is supplied when the contact of the power switch (PS) is turned on, the power supplied via the contact of the power switch (PS) is input to the terminal block 60, the input to the terminal block 60 Power is supplied to the driving power of each component.

상기 각 구성요소들의 구동전원으로는 릴레이(R), 퓨즈/누전차단기(10), 전자스위치(20), 전류계(30), 마이컴(40) 및 출력단자(50)에 공급된다.The driving power of each of the components is supplied to the relay R, the fuse / leakage circuit breaker 10, the electronic switch 20, the ammeter 30, the microcomputer 40, and the output terminal 50.

상기 전류계(30)는 계량기 내의 전류 값을 측정하고, 측정된 값을 마이컴(40)에 입력되고, 상기 퓨즈/누전차단기(10)는 계량기로 과부하 및 누전 등이 발생하면 공급되는 전원을 차단하며, 또한 마이컴(40)에서도 캐패시터와 같은 전자부품이 기 설정된 전류, 오버타임, 쇼트 및 누설전류 값이 기 설정된 값이나 그 이상이 되면 전자스위치(20)의 접점을 제어하여 구동전원을 차단하도록 하여 이중 안전장치를 갖도록 구성하는 것이 바람직하다. 따라서, 캐패시터 등과 같은 전자제품 및 그 부품들의 고장판정기준 결정, 재료의 특성, 가속조건 등에 의한 가속수명시험을 통해 고정율과 평균수명을 산출하게 되는 것이다.The ammeter 30 measures a current value in the meter, inputs the measured value to the microcomputer 40, and the fuse / circuit breaker 10 cuts off the power supplied when an overload and a short circuit occur in the meter. In addition, in the microcomputer 40, when an electronic component such as a capacitor reaches a predetermined value or more than a preset current, overtime, short and leakage current value, it controls the contact of the electronic switch 20 to cut off the driving power. It is desirable to have a double safety device. Therefore, the fixed rate and the average life are calculated through the accelerated life test based on the failure determination criteria of the electronic products and their components such as capacitors, the characteristics of the materials, the acceleration conditions, and the like.

상기 리셋스위치(RS)는 누전차단기(10) 및 전자스위치(20)가 과부하 및 누전 등에 의해 전원이 차단된 경우 이를 초기화시키기 위한 것이다.The reset switch RS is for initializing the circuit breaker 10 and the electronic switch 20 when the power is cut off due to an overload or a short circuit.

상기 캐패시터 내구성 시험용 다기능 과전류 계전기의 작동상태를 살펴보면 다음과 같다.The operational state of the multifunction overcurrent relay for the capacitor durability test is as follows.

바람직하게는, 먼저 온도 및 습도 등을 조절할 수 있도록 된 항온실(미 도시됨) 내에 캐패시터 등과 같은 전자제품 및 부품 등을 설치하고, 상기 전자제품 및 부품을 출력단자(50)에 연결한 다음 전원스위치(PS)를 눌러 다기능 과전류 계전기에 전원을 공급한다.Preferably, first, the electronics and components such as capacitors and the like are installed in a constant temperature room (not shown) that is capable of controlling temperature and humidity, and then connecting the electronics and components to the output terminal 50 and then power Press the switch (PS) to power the multifunction overcurrent relay.

상기 과전류 계전기에 전원이 공급된 상태에서 캐패시터의 정상 작동에 따라 얻어지는 전류, 오버타임, 쇼트 및 누설전류 값 등을 마이컴(40)의 조절밸브(41)를가속조건을 설정하고, 상기 캐패시터가 작동되는 과정에서 과도한 전류, 오버타임, 쇼트 및 누설전류 값이 상기 마이컴(40)의 표시수단(42)에 표시함으로서, 상기 캐패시터 등과 같은 각 전자제품 및 그 부품들의 고정율과 평균수명을 산출하게 되는 것이다.In the state where power is supplied to the overcurrent relay, the current, overtime, short and leakage current values obtained according to the normal operation of the capacitor are set to accelerate the control valve 41 of the microcomputer 40, and the capacitor is operated. Excessive current, over time, short and leakage current values are displayed on the display means 42 of the microcomputer 40 in the process of calculating the fixed rate and average life span of each electronic product such as the capacitor and its components. will be.

또한, 본 발명의 바람직한 실시 예에 대하여 도시하고 또한 설명하였으나, 본 발명은 상기한 실시 예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 본 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형 실시가 가능한 것은 물론이고, 그와 같은 변경은 기재된 청구범위 내에 있게 된다.In addition, although the preferred embodiments of the present invention have been illustrated and described, the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described embodiments without departing from the gist of the invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such modifications are intended to fall within the scope of the appended claims.

이상에서 살펴본 바와 같이, 본 발명은 다기능 과전류 계전기는 각종 전자제품 및 그 부품들을 전류, 오버타임, 쇼트 및 누설전류 값들을 임의의 값으로 조절하여 측정할 수 있으며, 상기 전류, 오버타임, 쇼트 및 누설전류를 각각 표시수단에 표시됨으로 육안으로 용이하게 확인할 수 있는 장점을 갖는다.As described above, in the present invention, the multifunction overcurrent relay may measure various electronic products and components thereof by adjusting current, overtime, short, and leakage current values to arbitrary values, and the current, overtime, short, and Leakage current is displayed on the display means, respectively, has the advantage that can be easily confirmed with the naked eye.

Claims (4)

상기 전원스위치(PS)로부터 입력된 전원을 각 구성요소들의 구동전원을 공급하는 단자대(60)와;A terminal block 60 for supplying driving power for each component of the power input from the power switch PS; 상기 단자대(60)에 연결되어 과부하 및 누전을 방지하는 퓨즈/누전차단기(10)와;A fuse / leakage circuit breaker 10 connected to the terminal block 60 to prevent an overload and a short circuit; 상기 단자대(60)로부터 공급된 전원에 의해 계전기 내의 전류 값을 측정하는 전류계(30)와;An ammeter (30) for measuring a current value in the relay by the power supplied from the terminal block (60); 상기 전류 값을 토대로 캐패시터와 같은 전자부품의 내구성을 시험하기 위해 전류, 오버타임, 쇼트 및 누설전류의 가속조건을 설정하며, 상기 계전기의 작동에 따른 전류, 오버타임, 쇼트 및 누설전류 값을 표시하는 마이컴(40) 및;Based on the current value, acceleration conditions of current, overtime, short and leakage current are set to test the durability of an electronic component such as a capacitor, and current, overtime, short and leakage current values are displayed according to the operation of the relay. Microcomputer 40 and; 상기 캐패시터와 같은 전자부품을 연결하는 출력단자(50)를 포함하는 것을 특징으로 하는 캐패시터 내구성 시험용 다기능 과전류 계전기.Multifunction overcurrent relay for a capacitor durability test, characterized in that it comprises an output terminal (50) for connecting the electronic components, such as the capacitor. 제 1항에 있어서, 상기 마이컴(40)에는 전류, 오버타임, 쇼트 및 누설전류 값을 각각 조절하는 조절밸브(41)와;The microcomputer 40 of claim 1, further comprising: a control valve 41 for adjusting a current, an overtime, a short, and a leakage current value; 상기 각 조절밸브(41)에 의해 조절되는 전류, 오버타임, 쇼트, 누설전류 값 및 계전기의 작동상태를 표시하는 표시수단(42)이 더 포함된 것을 특징으로 하는 캐패시터 내구성 시험용 다기능 과전류 계전기.Multifunction overcurrent relay for capacitor durability test, characterized in that it further comprises a display means for displaying the current, over time, short, leakage current value and the operating state of the relay controlled by the control valve (41). 제 1항 및 제 2항에 있어서, 상기 캐패시터가 상기 마이컴(40)의 조절밸브(41)에 의해 기 설정된 전류, 오버타임, 쇼트 및 누설전류 값 이상의 값이 발생하게 되면 구동전원을 차단하기 위한 전자스위치(20)가 더 포함된 것을 특징으로 하는 캐패시터 내구성 시험용 다기능 과전류 계전기.The method of claim 1 or 2, wherein the capacitor is configured to shut off the driving power when a value greater than or equal to a preset current, overtime, short, and leakage current value is generated by the control valve 41 of the microcomputer 40. Multifunction overcurrent relay for capacitor durability test, characterized in that it further comprises an electronic switch (20). 제 1항 또는 제 3항에 있어서, 상기 누전차단기(10) 및 전자스위치(20)가 과부하 및 누전 등에 의해 전원이 차단된 경우 상기 계전기를 초기화시키기 위한 리셋스위치(RS)를 더 포함하는 것을 특징으로 하는 캐패시터 내구성 시험용 다기능 과전류 계전기.According to claim 1 or 3, wherein the circuit breaker 10 and the electronic switch 20 further comprises a reset switch (RS) for initializing the relay when the power is cut off due to overload and short circuit, etc. Multifunction overcurrent relay for capacitor durability testing.
KR1020020036218A 2002-06-27 2002-06-27 Multi-functional over-current relay for durability test of capacitor KR20040001124A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825147A (en) * 1988-09-14 1989-04-25 Sencore, Inc. Capacitance measuring method and apparatus
JPH07320993A (en) * 1994-05-20 1995-12-08 Marcon Electron Co Ltd Capacitor testing method
JPH08196082A (en) * 1995-01-12 1996-07-30 Toshiba Transport Eng Kk Service life decision unit for filter capacitor in power converter
KR970048226A (en) * 1995-12-29 1997-07-29 김태구 Durability Tester
JPH1194891A (en) * 1997-09-17 1999-04-09 Nissin Electric Co Ltd Capacitor insulation degradation diagnostic device
JPH11231008A (en) * 1998-02-16 1999-08-27 Omron Corp Capacitor life diagnostic device and apparatus with built-in capacitor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4825147A (en) * 1988-09-14 1989-04-25 Sencore, Inc. Capacitance measuring method and apparatus
JPH07320993A (en) * 1994-05-20 1995-12-08 Marcon Electron Co Ltd Capacitor testing method
JPH08196082A (en) * 1995-01-12 1996-07-30 Toshiba Transport Eng Kk Service life decision unit for filter capacitor in power converter
KR970048226A (en) * 1995-12-29 1997-07-29 김태구 Durability Tester
JPH1194891A (en) * 1997-09-17 1999-04-09 Nissin Electric Co Ltd Capacitor insulation degradation diagnostic device
JPH11231008A (en) * 1998-02-16 1999-08-27 Omron Corp Capacitor life diagnostic device and apparatus with built-in capacitor

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