Product Introduction
The transformer DC winding resistance test is a key test method for evaluating the conductive performance of windings. It applies a constant DC current and measures the voltage drop, and calculates the winding resistance value in combination with Ohm's law to determine whether the winding material uniformity, turn-to-turn contact quality, and conductor cross-sectional area meet the design requirements. This test uses a high-precision DC power supply and a digital bridge, which can effectively detect defects such as broken winding strands, poor soldering, or turn-to-turn short circuits.
Product Features
High-precision Measurement
The transformer DC winding resistance tester uses advanced digital sampling technology and has a built-in precision resistance measurement module with a resolution of 0.1μΩ. It can accurately analyze resistance values regardless of their value.
Efficient And Fast Measurement
The transformer DC winding resistance tester can be completed in seconds. For example, it only takes 3 seconds to measure the winding resistance of a 1000kVA transformer.
Wide Range Of Environmental Adaptability
The transformer DC winding resistance test set has an operating temperature range of -10℃ to 45℃ and is suitable for altitudes of ≤2000 meters. It can operate stably in complex environments such as severe cold, heat, high humidity, and high altitude.
Technical Parameters
|
type |
Integrated portable |
| Test current |
1mA 10mA 1A 5A 10A |
| Measuring range |
1mA：10Ω~20KΩ |
|
10mA：1Ω~2KΩ |
|
|
1A：10mΩ~20Ω |
|
|
5A：1mΩ~4Ω |
|
|
10A：1mΩ~2Ω |
|
|
Measurement accuracy |
± (0.2% full scale ± 2 words) |
|
Data storage |
255 of them |
|
Display |
liquid crystal display |
|
Maximum resolution |
0.1μΩ |
|
Power supply |
AC 220V±22V,50Hz±2 Hz |
|
Maximum power consumption |
300W |
|
Work environment |
Environmental temperature: 0 ° C to 40 ° C Relative humidity: ≤ 80% |
|
Volume |
400x200x280mm3 |
|
Weight |
9kg |
Nickname: DC Winding Resistance Tester, Resistance Meter, Three-circuit Transformer DC Resistance Tester
Core application scenarios
1, Power system testing and maintenance
Transformer winding test: By measuring the DC resistance of the winding, determine whether there are problems such as inter turn short circuits and poor contacts.
High voltage switch contact resistance detection: Detect the contact resistance of circuit breakers and isolating switches to ensure conductivity.
Grounding grid resistance measurement: Measuring the resistance value of the grounding grid in large substations, the tester can quickly locate corrosion or fracture faults.
2, Industrial equipment and manufacturing applications
In industrial production, transformer DC winding resistance testers are used for quality control and fault diagnosis:
Motor and generator testing: Measure the resistance of the stator and rotor windings. A deviation of more than 5% may indicate insulation aging.
Cable and wire quality inspection: The conductor resistance needs to be tested before leaving the factory.
Reliability assessment of welding points: Abnormal resistance at the welding points of automotive or aviation components may reflect virtual welding problems.
3, New Energy and Research Fields
Battery system testing: The individual resistance difference of the power battery module should be controlled within ± 10% to avoid imbalance between charging and discharging.
Superconducting material research: The tester can detect the critical resistance of superconductors (close to 0 Ω) to verify material properties.
Photovoltaic module connection inspection: Excessive series resistance of solar panels can lead to a decrease in power generation efficiency, and regular monitoring is required.
4, Other special scenarios
Rail transit: Resistance measurement of high-speed rail traction motor windings is a key item for daily maintenance.
Laboratory calibration: used to calibrate standard resistors.
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FAQ
Q1: Can the transformer DC winding resistance tester be used near live equipment?
A1: Not allowed. The transformer DC winding resistance 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 transformer DC winding resistance 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 transformer DC winding resistance test set 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: What is the main purpose of a DC resistance tester for measuring?
A4: The DC resistance tester is mainly used to measure the direct current resistance of conductive circuits in electrical equipment, such as switch contacts, wire connections, transformer windings, etc.
Q5: Why is DC resistance testing so important?
A5: DC resistance test is an important means to determine whether the equipment has good contact and whether the conductivity meets the standard. Abnormal resistance values may indicate poor contact, material aging, and other issues, which in turn can affect the safety of equipment operation.
Q6: What environmental factors should be noted when using a transformer DC winding resistance tester?
A6: Environmental temperature is an important factor affecting the resistance value. Before testing, it is necessary to understand the temperature requirements of the tested equipment and conduct the test at an appropriate temperature.
Q7: What is the measurement principle of the DC winding resistance tester?
A7: Most transformer DC winding resistance testers use a four wire measurement method, which measures voltage drop by applying a constant current and calculates resistance using Ohm's law to reduce interference from test lines and contact resistance.
Q8: How to ensure the accuracy of DC resistance testing?
A8: To ensure accuracy, it is necessary to select appropriate instruments, operate them in a standardized manner, connect the test lines correctly, and analyze them in combination with the historical data and standards of the equipment. Regular calibration of instruments is also crucial.
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