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KR102319906B1 - Insulation Resistance Measuring System of Heating Cable - Google Patents

Insulation Resistance Measuring System of Heating Cable Download PDF

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Publication number
KR102319906B1
KR102319906B1 KR1020200154106A KR20200154106A KR102319906B1 KR 102319906 B1 KR102319906 B1 KR 102319906B1 KR 1020200154106 A KR1020200154106 A KR 1020200154106A KR 20200154106 A KR20200154106 A KR 20200154106A KR 102319906 B1 KR102319906 B1 KR 102319906B1
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South Korea
Prior art keywords
insulation resistance
information
heating cable
unit
voltage
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KR1020200154106A
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Korean (ko)
Inventor
정경모
정진욱
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정경모
정진욱
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Priority to KR1020200154106A priority Critical patent/KR102319906B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/02—Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
    • G01R13/0281—Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form using electro-optic elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The present invention relates to a heating cable insulation resistance measurement system, which is configured by connecting an insulation resistance measuring unit of a power supply kit of a heating cable and a power relay, when it is necessary to measure insulation resistance, disconnect a terminal of the power relay from a voltage/current measurement unit, connect it to the insulation resistance measurement unit, and measure the insulation resistance of the heating cable connected to the power relay. Therefore, maintenance is easy.

Description

히팅케이블 절연저항 측정 시스템{Insulation Resistance Measuring System of Heating Cable}Heating Cable Insulation Resistance Measuring System {Insulation Resistance Measuring System of Heating Cable}

본 발명은 히팅 케이블의 절연 저항 측정에 관한 것이다. 일반적으로 저유조, 식품보존조와 같은 대상물의 동파 방지와 적정온도 유지를 위하여 히팅 케이블을 설치하고 있으며 상기 히팅 케이블은 각각의 파워 연결 키트를 통하여 전원을 공급하도록 구성되고 있는 것이다.The present invention relates to the measurement of the insulation resistance of a heating cable. In general, heating cables are installed to prevent freezing of objects such as oil storage tanks and food storage tanks and to maintain proper temperature, and the heating cables are configured to supply power through each power connection kit.

본 발명과 관련된 종래기술은 대한민국 공개특허 제10-2015-0053052호(2015. 05. 15. 공개)에 게시되어 있는 것이다. 도 1은 상기 종래의 고출력 금속 저항선 히팅 케이블 구성도이다. 상기도 1에서 종래의 고출력 금속 저항선 히팅 케이블은 1) 적절한 전기저항을 갖는 합금도체가 권취된 보빈을 압출라인의 송출기 (Pay-off)에 장착하고 도 1과 같이 불소계 결정성 수지를 사용하여 1차 절연체를 압출성형한다. 이때 절연두께는 04 ㎜ 이상이 되도록 압출한다. 04 ㎜ 미만이면 절연효과가 저하된다. 2) 1차 절연 압츨된 선재 위에 폴리올레핀 수지로 도 1과 같이 2차 절연체를 압출성형한다. 이때 절연두께는 08 ㎜ 이상이 되도록 한다. 08 ㎜ 미만이면 절연효과가 저하된다. 3) 2차 절연 압출된 합금도체 두 가닥을 집합하여 그 위에 주석도금 구리도체로 편조한다. 4) 편조한 후 그 위에 적절히 처방된 고분자재료 컴파운드를 사용하여 외부 피복체를 압출성형하여 직렬형 히팅케이블을 제조한다. <실시예 1> 구리-니켈로 구성되어 정격저항이 028 Ω/m인 합금도체를 상기 제조방법을 통해 불소수지의 일종인 ETFE(Ethylene Tetrafluoroethylene)를 사용하여 1차 절연하고, 폴리에틸렌-에틸렌비닐 아세테이트 공중합체가 혼합된 폴리올레핀 수지로 구성된 복합재료를 사용하여 2차 절연하였다. 절연된 2개의 합금선을 집합하고, 주석도금 구리도체로 편조한 후 폴리올레핀계 난연 컴파운드를 사용하여 시스 압출하여 직렬형 히팅케이블을 완성하였다.The prior art related to the present invention is disclosed in Korean Patent Publication No. 10-2015-0053052 (published on May 15, 2015). 1 is a configuration diagram of the conventional high-output metal resistance wire heating cable. In Figure 1, the conventional high-power metal resistance wire heating cable is 1) a bobbin wound with an alloy conductor having an appropriate electrical resistance is mounted on the pay-off of the extrusion line, and a fluorine-based crystalline resin is used as shown in FIG. The car insulation is extruded. At this time, the insulation thickness is extruded to be 04 mm or more. If it is less than 04 mm, the insulating effect is lowered. 2) Primary insulation Extrusion molding of a secondary insulator as shown in FIG. 1 with polyolefin resin on the extruded wire rod. At this time, the insulation thickness should be 08 mm or more. If it is less than 08 mm, the insulating effect is lowered. 3) Secondary Insulation Assemble two extruded alloy conductors and braid them with tin-plated copper conductors. 4) After braiding, the outer sheath is extruded using an appropriately prescribed polymer material compound to manufacture a serial heating cable. <Example 1> An alloy conductor composed of copper-nickel and having a rated resistance of 028 Ω/m was first insulated using ETFE (Ethylene Tetrafluoroethylene), a type of fluororesin, through the above manufacturing method, and polyethylene-ethylene vinyl acetate Secondary insulation was performed using a composite material composed of a polyolefin resin mixed with a copolymer. Two insulated alloy wires were assembled, braided with tin-plated copper conductors, and sheath-extruded using a polyolefin-based flame-retardant compound to complete a serial heating cable.

상기와 같이 제조된 종래의 히팅 케이블 관련 기술은 히팅 케이블이 고출력을 낼 수 있으나 사용 기간이 오래 지나면 절연 저항이 떨어져서 출력이 저하되고 또 교체하여야 하는데 주기적으로 절연 저항을 측정하는 방법을 제시하고 있지는 않은 것이다. 또한, 통상 종래의 히팅 케이블 절연 저항 측정은 히팅 케이블에 전원을 공급하는 전원 케이블을 분리하고 절연을 측정하므로 매 절연 저항 측정 시마다 전원 케이블을 분리하고 다시 연결하는 작업이 필요한 것이다.In the conventional heating cable-related technology manufactured as described above, the heating cable can produce high output, but after a long period of use, the insulation resistance drops and the output decreases and must be replaced. will be. In addition, since the conventional heating cable insulation resistance measurement separates the power cable for supplying power to the heating cable and measures the insulation, it is necessary to disconnect and reconnect the power cable every time insulation resistance is measured.

상기와 같은 종래 기술의 문제점을 해결하기 위한 본 발명 히팅케이블 절연저항 측정 시스템은 히팅 케이블의 전원 연결 키트의 절연저항 측정부와 파워 릴레이를 연결하여 구성하고 절연 저항 측정이 필요한 경우에 파워 릴레이의 단자를 전압/전류 측정부에서 분리하여 절연저항 측정부로 연결하고 파워 릴레이에 연결된 히팅 케이블의 절연 저항을 측정하도록 하는 것이다.The present invention heating cable insulation resistance measurement system for solving the problems of the prior art as described above is configured by connecting the insulation resistance measurement unit of the power connection kit of the heating cable and the power relay, and when insulation resistance measurement is required, the terminal of the power relay is to be separated from the voltage/current measuring part, connected to the insulation resistance measuring part, and to measure the insulation resistance of the heating cable connected to the power relay.

삭제delete

상기와 같이 구성된 본 발명 히팅케이블 절연저항 측정 시스템은 히팅 케이블의 전원 공급 세트를 분리하지 아니하고 파워 릴레이의 전원 공급 단자를 차단하도록 함으로써 간단히 절연 저항을 측정할 수 있는 효과가 있는 것이다. 또한 절연 저항측정부에서 측정된 절연 저항 값을 디스플레이부로 표출하도록 할 수 있는 효과가 있는 것이다. 또한, 본 발명은 절연 저항을 측정하기 위하여 전원 세트를 분리할 필요가 없으므로 유지 보수가 용이한 효과가 있는 것이다.The present invention heating cable insulation resistance measuring system configured as described above has the effect of simply measuring the insulation resistance by blocking the power supply terminal of the power relay without disconnecting the power supply set of the heating cable. In addition, there is an effect that the insulation resistance value measured by the insulation resistance measuring unit can be displayed on the display unit. In addition, the present invention has the effect of easy maintenance because there is no need to separate the power supply set in order to measure the insulation resistance.

도 1은 종래의 고출력 금속 저항선 히팅 케이블 구성도,
도 2는 본 발명에 적용되는 절연저항 측정 시스템의 구성도,
도 3은 본 발명 전원 연결 키트에 구비된 절연저항 측정 시스템 구성도이다.1 is a configuration diagram of a conventional high-power metal resistance wire heating cable;
2 is a block diagram of an insulation resistance measurement system applied to the present invention;
Figure 3 is a configuration diagram of the insulation resistance measurement system provided in the power connection kit of the present invention.

상기와 같이 구성된 본 발명 히팅케이블 절연저항 측정 시스템을 도 2 내지 도 3을 기초로 하여 설명하면 다음과 같다.The present invention heating cable insulation resistance measuring system configured as described above will be described based on FIGS. 2 to 3 as follows.

도 2는 본 발명에 적용되는 절연저항 측정 시스템의 구성도이다. 상기도 2에서 본 발명에 적용되는 절연저항 측정 시스템은 절연저항 측정부에 전원을 공급하는 DC 500V 발생기(10)와, DC 500V 발생기에 연결되는 절연저항 측정부(20)와, 절연저항 측정부와 AC 220V를 공급받는 전압/전류 측정부에 선택적으로 연결되는 파워 릴레이(30)와, 파워 릴레이에 연결되는 히팅 케이블(200)로 구성된 것을 특징으로 하는 것이다. 상기에서 히팅 케이블(200)이 다수인 경우에는 각 히팅 케이블에 각각의 전원 연결 키트가 연결되는 구조이다.2 is a block diagram of an insulation resistance measuring system applied to the present invention. 2, the insulation resistance measurement system applied to the present invention includes a DC 500V generator 10 for supplying power to the insulation resistance measurement unit, an insulation resistance measurement unit 20 connected to the DC 500V generator, and an insulation resistance measurement unit It is characterized in that it is composed of a power relay 30 selectively connected to the voltage/current measuring unit supplied with AC 220V, and a heating cable 200 connected to the power relay. In the case in which the heating cable 200 is a plurality, each power connection kit is connected to each heating cable.

도 3은 본 발명 전원 연결 키트에 구비된 절연저항 측정 시스템 구성도이다. 상기도 3에서 본 발명 전원 연결 키트에 구비된 절연저항 측정 시스템에서 (a)는 전원 연결 키트와 상기 전원 연결 키트에 연결되는 히팅 케이블의 구성을 나타내고 (b)는 전원 연결 키트의 상세 구성도로서 본 발명 전원 연결 키트에 구비된 절연저항 측정 시스템은 히팅 케이블(200)과, 상기 히팅 케이블에 연결되는 전원 연결 키트(100)로 구성되고, 상기 전원 연결 키트(100)는 DC 500V를 생성하고 DC 500V를 절연 저항 측정부에 공급하는 DC 500V 발생기(10)와, 상기 DC 500V 생성기로부터 전원을 공급받으며 파워 릴레이의 접점을 연결하여 히팅 케이블의 절연 저항을 측정하고 측정된 절연저항 정보를 MPU로 전송하는 절연저항 측정부(20)와, 접점을 절연저항 측정부로 연결하거나 AC 220V를 공급받는 전압/전류 측정부로 선택적으로 연결될 수 있는 파워 릴레이(30)와, 파워 릴레이와 접점을 연결하며 AC 220V를 공급받아서 히팅 케이블의 전압 및 전류를 측정하고 측정된 전압 및 전류 정보를 MPU로 전송하는 전압/전류 측정부(40)와, AC 220V를 공급받으며 주변 전자기기로부터 유입되는 Noise 및 저주파 주파수 노이즈를 필터링 하기 위한 Noise 필터(50)와, Noise 필터를 통하여 AC 220를 공급받으며, MPU의 제어에 따라서 절연 저항 정보, 전압 및 전류 정보를 분전함(LCP)로 전송하는 PLC 모듈(60) 또는 LoRa 모듈(70)과, 절연저항 측정부(20)로부터 절연저항 정보를 수신하여 저장하고, 전압/전류 측정부(40)로부터 전압 및 전류 정보를 수신하여 저장하며, 온도 센서부로부터 수신된 온도 정보를 저장하고, 분전함(LCP, 300)의 데이터 전송 요청에 따라서 절연저항 정보 또는 전압 및 전류 정보 또는 온도 정보를 PLC 모듈 또는 LoRa 모듈를 통하여 분전함으로 전송하도록 제어하고, 키부의 사용자 입력 정보를 디스플레이부로 표출하도록 제어하는 MPU(80)와, MPU의 제어에 따라서 절연 저항 정보, 전압 및 전류 정보, 키부의 입력 정보, 온도 정보를 표출하는 디스플레이부(90)와, 사용자가 원하는 정보를 입력하여 디스플레이부로 표출하도록 하는 키부(95)와, 히팅 케이블의 온도를 센싱하여 MPU로 전송하여 저장하도록 하는 온도 센서부(99)로 구성된 것을 특징으로 하는 것이다. 또한 상기에서 분전함(LCP, 300)은 마스터로서 구동하는 것으로 데이터 송수신부, 수신된 정보를 표출하는 디스플레이부 및 데이터 송수신부와 디스플레이부를 제어하는 컨트롤러가 구성된 것을 특징으로 하는 것이다.Figure 3 is a configuration diagram of the insulation resistance measurement system provided in the power connection kit of the present invention. In Fig. 3, in the insulation resistance measurement system provided in the power connection kit of the present invention, (a) shows the configuration of the power connection kit and the heating cable connected to the power connection kit, and (b) is a detailed configuration diagram of the power connection kit. The insulation resistance measurement system provided in the power connection kit of the present invention is composed of a heating cable 200 and a power connection kit 100 connected to the heating cable, and the power connection kit 100 generates DC 500V and DC A DC 500V generator 10 that supplies 500V to the insulation resistance measuring unit, receives power from the DC 500V generator and connects the contacts of the power relay to measure the insulation resistance of the heating cable and transmit the measured insulation resistance information to the MPU Insulation resistance measuring unit 20, which can be connected to the insulation resistance measuring unit or selectively connected to the voltage/current measuring unit receiving AC 220V, and connecting the power relay and the contact to AC 220V A voltage/current measuring unit 40 that receives the supply, measures the voltage and current of the heating cable, and transmits the measured voltage and current information to the MPU, and receives AC 220V and filters noise and low-frequency noise from surrounding electronic devices PLC module 60 or LoRa module 70 that receives AC 220 through the Noise filter 50 for ), and receives and stores insulation resistance information from the insulation resistance measurement unit 20, receives and stores voltage and current information from the voltage/current measurement unit 40, and stores the temperature information received from the temperature sensor unit, and , control to transmit insulation resistance information or voltage and current information or temperature information to the distribution box through the PLC module or LoRa module according to the data transmission request of the distribution box (LCP, 300), and control to display the user input information of the key unit to the display unit MPU 80 and insulation resistance information according to the control of the MPU , voltage and current information, the input information of the key unit, the display unit 90 for expressing the temperature information, and the key unit 95 for inputting the user's desired information to be expressed on the display unit, and sensing the temperature of the heating cable to the MPU It is characterized in that it is composed of a temperature sensor unit 99 to transmit and store. In addition, the distribution box (LCP, 300) is driven as a master in the above, it is characterized in that the data transceiver, a display unit for expressing the received information, and a controller for controlling the data transmission and reception unit and the display unit are configured.

10 : DC 500V 발생기, 20 : 절연저항 측정부,
30 : 파워 릴레이, 40 : 전압/전류 측정부,
50 : Noise 필터, 60 : PLC 모듈,
70 : LoRa 모듈, 80 : MPU,
90 : 디스플레이부, 95 : 키부,
99 : 온도 센서부, 100 : 전원 연결 키트,
200 : 히팅 케이블10: DC 500V generator, 20: insulation resistance measuring part,
30: power relay, 40: voltage/current measuring unit,
50: Noise filter, 60: PLC module,
70: LoRa module, 80: MPU,
90: display unit, 95: key unit,
99: temperature sensor unit, 100: power connection kit,
200: heating cable

Claims (3)

히팅 케이블에 연결되는 전원 연결 키트로 구성된 히팅 케이블 전원 공급 세트의 파워릴레이를 포함하는 히팅 케이블의 절연 저항 측정 시스템에 있어서,
상기 파워릴레이를 포함하는 히팅 케이블의 절연 저항 측정 시스템은,
히팅 케이블(200)과;
히팅 케이블에 연결되는 것으로 DC 500V를 생성하고 DC 500V를 절연 저항 측정부에 공급하는 DC 500V 발생기(10)와, 상기 DC 500V 생성기로부터 전원을 공급받으며 파워 릴레이의 접점을 연결하여 히팅 케이블의 절연 저항을 측정하고 측정된 절연저항 정보를 MPU로 전송하는 절연저항 측정부(20)와, 접점을 절연저항 측정부로 연결하거나 AC 220V를 공급받는 전압/전류 측정부로 선택적으로 연결될 수 있는 파워 릴레이(30)와, 파워 릴레이와 접점을 연결하며 AC 220V를 공급받아서 히팅 케이블의 전압 및 전류를 측정하고 측정된 전압 및 전류 정보를 MPU로 전송하는 전압/전류 측정부(40)와, AC 220V를 공급받으며 주변 전자기기로부터 유입되는 Noise 및 저주파 주파수 노이즈를 필터링 하기 위한 Noise 필터(50)와, Noise 필터를 통하여 AC 220를 공급받으며, MPU의 제어에 따라서 절연 저항 정보, 전압 및 전류 정보를 분전함(LCP)로 전송하는 PLC 모듈(60) 또는 LoRa 모듈(70)과, 절연저항 측정부(20)로부터 절연저항 정보를 수신하여 저장하고, 전압/전류 측정부(40)로부터 전압 및 전류 정보를 수신하여 저장하며, 온도 센서부로부터 수신된 온도 정보를 저장하고, 분전함(LCP, 300)의 데이터 전송 요청에 따라서 절연저항 정보 또는 전압 및 전류 정보 또는 온도 정보를 PLC 모듈 또는 LoRa 모듈를 통하여 분전함으로 전송하도록 제어하고, 키부의 사용자 입력 정보를 디스플레이부로 표출하도록 제어하는 MPU(80)와, MPU의 제어에 따라서 절연 저항 정보, 전압 및 전류 정보, 키부의 입력 정보, 온도 정보를 표출하는 디스플레이부(90)와, 사용자가 원하는 정보를 입력하여 디스플레이부로 표출하도록 하는 키부(95)와, 히팅 케이블의 온도를 센싱하여 MPU로 전송하여 저장하도록 하는 온도 센서부(99)로 이루어진 전원 연결 키트;
및 마스터로서 구동하고, 전원 연결 키트와 통신하여 절연저항 정보, 전압 및 전류 정보를 수신하는 분전함(LCP)로 구성된 것으로 상기 분전함(LCP)은, 데이터 송수신부와 수신된 정보를 표출하는 디스플레이부 및 데이터 송수신부와 디스플레이부를 제어하는 컨트롤러가 구성된 것을 특징으로 하는 파워릴레이를 포함하는 히팅 케이블의 절연 저항 측정 시스템.






In the heating cable insulation resistance measurement system comprising a power relay of the heating cable power supply set consisting of a power connection kit connected to the heating cable,
Insulation resistance measurement system of a heating cable including the power relay,
a heating cable 200;
A DC 500V generator 10 that generates DC 500V and supplies DC 500V to the insulation resistance measurement unit by being connected to a heating cable, receives power from the DC 500V generator, and connects the contacts of a power relay to connect the insulation resistance of the heating cable Insulation resistance measuring unit 20 that measures and transmits the measured insulation resistance information to the MPU, and a power relay 30 that can be selectively connected to a voltage/current measuring unit receiving AC 220V or connecting a contact to an insulation resistance measuring unit A voltage/current measuring unit 40 that connects the contact with the power relay and receives AC 220V to measure the voltage and current of the heating cable and transmits the measured voltage and current information to the MPU, and receives AC 220V around the Noise filter 50 for filtering noise and low-frequency noise coming from electronic devices, AC 220 is supplied through the noise filter, and insulation resistance information, voltage and current information are distributed (LCP) according to the control of the MPU. Receives and stores insulation resistance information from the transmitting PLC module 60 or LoRa module 70 and the insulation resistance measurement unit 20, and receives and stores voltage and current information from the voltage/current measurement unit 40 , to store the temperature information received from the temperature sensor unit, and to transmit insulation resistance information or voltage and current information or temperature information to the distribution box through a PLC module or LoRa module according to the data transmission request of the distribution box (LCP, 300). MPU 80 for controlling to express the user input information of the key unit to the display unit, and the display unit 90 for expressing insulation resistance information, voltage and current information, input information of the key unit, temperature information according to the control of the MPU, and the user A power connection kit consisting of a key unit 95 for inputting desired information and expressing it on the display unit, and a temperature sensor unit 99 for sensing the temperature of the heating cable and transmitting it to the MPU for storage;
and a distribution box (LCP) that operates as a master and communicates with the power connection kit to receive insulation resistance information, voltage and current information, and the distribution box (LCP) includes a data transmission/reception unit and a display unit for expressing the received information and Insulation resistance measurement system of a heating cable including a power relay, characterized in that the controller for controlling the data transmission and reception unit and the display unit is configured.






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KR1020200154106A 2020-11-17 2020-11-17 Insulation Resistance Measuring System of Heating Cable KR102319906B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114325108A (en) * 2021-12-18 2022-04-12 上海马勒热系统有限公司 Method for detecting insulating property of high-voltage heater of automobile air conditioner

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030003603A (en) * 2001-07-03 2003-01-10 이동영 Apparatus of a global Assessment of Cables Insulation and Method for globally Assessmenting as the same
KR101934726B1 (en) * 2018-03-27 2019-01-03 한국남동발전주식회사 Heating cable Smart control and monitoring device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030003603A (en) * 2001-07-03 2003-01-10 이동영 Apparatus of a global Assessment of Cables Insulation and Method for globally Assessmenting as the same
KR101934726B1 (en) * 2018-03-27 2019-01-03 한국남동발전주식회사 Heating cable Smart control and monitoring device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114325108A (en) * 2021-12-18 2022-04-12 上海马勒热系统有限公司 Method for detecting insulating property of high-voltage heater of automobile air conditioner
CN114325108B (en) * 2021-12-18 2024-03-08 上海马勒热系统有限公司 Method for detecting insulation performance of high-voltage heater of automobile air conditioner

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