UHV-10C Transformer DC Winding Resistance Tester

Product Introduction

DC resistance of transformer is a must-test item of semi-finished product, finished product factory test, installation, handover test and preventive test of power department in transformer manufacturing, which can effectively find manufacturing defects such as material selection, welding, loose connection parts, missing strands, broken wires and other hidden dangers after operation.

The transformer DC resistance tester is an innovative product with a built-in large-capacity lithium battery, which is small in size and easy to carry. The product is not only suitable for the measurement of inductive test products such as transformers, transformers, reactors, but also suitable for the measurement of resistive test products such as copper bars, wires, switch contacts, etc. The instrument test speed is fast and the accuracy is high.

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제품 특징

1. Dual Power Supply
Lithium battery or 220V AC adaptive input. Single charge supports 500+ transformer DC resistance tests.

2. Intelligent 10A Output
selectable currents (≤10A/25V) with auto-ranging for rapid testing.

3. Wide Range & High Accuracy
500μΩ – 50kΩ ±0.2% full-scale.

4. Resistance-Temperature Conversion
Built-in RT calculation for direct temperature analysis.

5. Comprehensive Safety Protections
Back-EMF / Open-circuit / Power-loss / Over-temperature protection with alarms.

6. Sunlight-Readable Display
5.6" industrial-grade color LCD (1000-nit brightness).

7. Printer-Ready
Supports external printers for instant reports.

8. Flexible Data Storage
Local memory + USB export capabilities.

Application Scenarios

1、 Power system maintenance and testing

1. Transformer winding test: By measuring the DC resistance of the transformer winding, determine whether there are problems such as inter turn short circuits and poor contacts.

2. Grounding grid resistance detection: Evaluate the conductivity of the grounding system of the substation or transmission tower to ensure lightning protection safety.

3. Circuit breaker contact resistance test: High voltage circuit breaker contact resistance can cause heating damage, and DC resistance tester can accurately measure micro ohm resistance.

2、 Industrial equipment and manufacturing applications

1. Maintenance of motors and generators: Check the resistance of stator/rotor windings to prevent efficiency degradation caused by insulation aging.

2. Quality inspection of cable production line: Conduct a full inspection of the cable conductor resistance before leaving the factory to ensure compliance with cross-sectional area and conductivity requirements.

3. Welding process evaluation: Measure the resistance of the welding point to determine the reliability of the connection, especially widely used in automotive manufacturing.

3、 Research and Special Fields

1. Material research: Used in the laboratory to measure the electrical resistivity of metals, composite materials, etc.

2. New energy equipment testing: such as measuring the series resistance of photovoltaic modules, which directly affects power generation efficiency.

3. Rail transit: High speed rail contact wire resistance monitoring to ensure power supply stability.

Advantages

1. High precision: The DC resistance tester adopts advanced measurement technology and manufacturing processes, such as the four wire method, which can effectively eliminate line resistance interference and improve measurement accuracy.

2. Quick measurement: The instrument is equipped with a programmable constant current source inside, which uses a larger current for testing, improving its anti sensing and anti-interference capabilities and greatly reducing testing time.

3. Automation and Intelligence: The DC resistance tester has the characteristics of automation and intelligence, such as automatic identification of equipment types, automatic selection of suitable testing methods, automatic completion of data recording and processing, etc., which improves measurement efficiency and accuracy.

4. Multifunctionality: In addition to basic measurement functions, it also has multiple functions such as calculation, printing, data storage, and export, realizing one machine for multiple purposes and meeting different testing needs.

5. Portability: The instrument is compact in size and lightweight, making it easy to carry to the site for testing, especially suitable for use in substations, transmission lines, and other places.

6. Stable and reliable: The DC resistance tester has stable and reliable performance, complete protection circuit, and can effectively ensure the efficiency and stability of measurement.

7. Wide measurement range: capable of measuring a wide range of resistance, ranging from micro ohms to thousands of ohms, suitable for testing various electrical equipment.

Frequently Asked Questions (FAQ)

Q1: What is the typical measurement range of a DC resistance tester? A1: The measurement range of the DC resistance tester is very wide, and according to different models, it can measure resistance from micro ohms to megaohms.

Q2: Why is it necessary to discharge before measurement? A2: The tested equipment may carry residual charges. Discharging before testing can avoid danger to the instrument and personnel, while ensuring the accuracy of the measurement data.

Q3: What is the difference between a DC resistance rapid tester and an AC resistance tester? A3: The DC resistance tester is mainly used to measure the DC resistance of conductive circuits, while the AC resistance tester is used to measure the impedance in AC circuits. The measurement principles and application scenarios of the two are different.

Q4: What should I do if there is an abnormality in the measurement results? A4: If the measurement result is abnormal, first check whether the connecting wire is firm, whether the measuring point is clean, and whether there is obvious damage to the equipment. If necessary, contact professional technicians or Wuhan UHV Power Technology Co., Ltd. for consultation.

Q5: How to improve the accuracy of DC resistance measurement? A5: Choosing high-precision testing instruments, standardizing operating procedures, paying attention to the impact of temperature changes, and ensuring good contact of measurement points are all key to improving measurement accuracy.