Product Introduction
The DC resistance test of transformer windings is a critical inspection item following transformer commissioning, major overhauls, and tap changer adjustments. Traditional measurement methods, such as the bridge method and the voltage drop method, are often time-consuming and labor-intensive when measuring the DC resistance of transformer windings and high-power inductive equipment. To address this limitation, shorten testing time, and reduce the workload of operators, our company has developed a DC Resistance Fast Tester (hereinafter referred to as the DC Resistance Tester).
Utilizing advanced power technology, this instrument features stable performance, rapid measurement, compact design, user-friendly operation, high accuracy, and excellent data repeatability. It serves as an ideal solution for measuring the DC resistance of transformer windings and high-power inductive devices.
תכונות מוצר
1. Compact in size and lightweight.
2. Full Chinese menu operation, easy and convenient to operate.
3. Fast measurement speed, accurate and stable data.
4. Equipped with automatic discharge and discharge indication functions to reduce misoperation and ensure the safety of equipment and personnel.
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פרמטרים טכניים
| Project | Project | Notes |
| זרם בדיקה | 1mA 10mA 1A 5A 10A | |
| טווח מדידה | 1mA：10Ω~20KΩ | |
| 10mA：1Ω~2KΩ | ||
| 1A：10mΩ~20Ω | ||
| 5A：1mΩ~4Ω | ||
| 10A：1mΩ~2Ω | ||
| דיוק מדידה | ± (0.2% full-scale ± 2 words) | |
| אחסון נתונים | 255 of them | |
| לְהַצִיג | liquid crystal display | The resistance is displayed as 4 1/2 bits |
| Maximum resolution | 0.1mΩ | |
| ספק כוח | AC 220V±22V,50Hz±2 Hz | Insurance pipe 5A |
| Maximum power consumption | 300W | When the test current is 10A |
| סביבת עבודה | Environmental temperature:0°～40° Relative humidity:≤80% | |
| כרך | 400x200x280mm3 | |
| מִשׁקָל | 9 ק"ג | Without accessories |
Functional Features
1. Quick testing: The instrument adopts a high-speed microprocessor, which has fast measurement speed and can quickly and accurately obtain the DC resistance value of the measured resistance.
2. High precision: The instrument adopts high-precision measurement circuits and digital signal processing technology, with high measurement accuracy and minimal error.
3. Easy to operate: The instrument has an intuitive LCD display and operation interface, making it easy to learn and use without the need for professional training.
4. Automatic storage: The instrument has a built-in memory that can automatically store test results, making it convenient for users to view and print test reports at any time.
5. Multiple measurement modes: The instrument supports multiple testing modes such as single piece testing and group testing, which are suitable for the needs of different occasions.
6. Protection function: The instrument has overvoltage, overcurrent and other protection functions, which can effectively protect the safety of the testing equipment.
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Application Scenarios
1、 Power system and transformer testing
The DC resistance tester is the core tool for transformer factory inspection, installation, commissioning, and regular maintenance in the power system. By measuring the DC resistance of the winding, it is possible to determine whether there are issues such as inter turn short circuits, poor contacts, or welding defects.
2、 Industrial manufacturing and motor maintenance
On the production line of motors and generators, DC resistance testers are used to evaluate the quality of windings. In the automotive manufacturing industry, testers are also used to detect the internal connection resistance of battery packs, ensuring the reliability of electric vehicle power systems.
3、 Cable fault diagnosis and new energy field
1. Cable detection: By measuring the DC resistance of cable conductors, breakpoints or high resistance faults can be located, especially suitable for long-distance power cables.
2. Photovoltaic and energy storage systems: The measurement of series resistance of solar panels and internal resistance of energy storage cells directly affects system efficiency, and the tester can quickly identify degraded units.
4、 Research experiments and quality control
In the laboratory, DC resistance testers are used for studying material conductivity, such as measuring the critical resistance of superconducting materials. In the aerospace field, resistance stability testing of aircraft cables can prevent signal transmission abnormalities caused by temperature changes.
Frequently Asked Questions (FAQ)
Q1: Can the DC resistance rapid tester be used near live equipment?
A1: Not allowed. The DC resistance rapid tester can only be connected for measurement after confirming that the tested equipment is completely powered off, tested, and grounded.
Q2: How long does the battery life of the DC resistance rapid tester last?
A2: It can work continuously for about 4 to 6 hours when fully charged. It is recommended to prepare backup batteries on site or use an external power adapter.
Q3: Is the measurement result of the DC resistance rapid tester greatly affected by temperature?
A3: It has an impact. It is recommended to use within the ambient temperature range of 5 ℃ to 40 ℃, as there may be deviations in measurement data at extreme temperatures.
Q4: Under what circumstances should special attention be paid to the abnormal increase of DC resistance?
A4: When the device experiences contact oxidation, poor contact, loose connectors, reduced wire cross-sectional area, etc., the DC resistance will abnormally increase.
Q5: What are the advantages of the equipment of Wuhan UHV Power Technology Co., Ltd?
A5: The equipment of Wuhan UHV Power Technology Co., Ltd. has significant advantages in measurement speed, accuracy, anti-interference ability, and user experience.
