Product introduction
The transformer dc winding resistance tester is a specialized testing device used for measuring the dc resistance value of windings in power transformers, high-voltage transformers, distribution transformers, and other equipment.
The dc resistance tester factory can effectively detect manufacturing defects such as material selection, welding, loose connection parts, missing strands, and broken wires in inductive coils, as well as hidden dangers that exist after operation. This transformer dc winding resistance tester manufacturer has the characteristics of small volume, light weight, wide range, easy operation, large output current, good repeatability, and complete protection functions. Suitable for high-precision testing of transformer winding resistance, as well as for testing the resistance of transformers and other inductive loads.
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Testing Significance
(1) Check winding connection quality
If there is poor contact at winding solder joints or lead connections, it will result in abnormally high resistance values.
(2) Determine tap changer condition
Abnormal contact of tap changer contacts will cause irregular resistance changes between different tap positions.
(3) Detect winding faults
Issues such as inter-turn short circuits, broken wires, or conductor damage in the windings may cause test data to deviate from the normal range.
(4) Evaluate equipment operating condition
By comparing test data with historical records, the trend of internal condition changes in the transformer can be analyzed.
Product Characteristics
1、Display: 5.0 inch touch true color LCD, Chinese operation menu (English version can be customized).
2、Storage: 1000 test records can be stored.
3、Test mode: built-in large capacity lithium battery DC power supply, convenient for outdoor test needs.
4、Five current options: automatic.
5、High precision: accuracy 0.2% ± 2 characters.
6、Measurement range: 1u Ω~100k Ω Resolution: 0.1u Ω.
7、Printing: high-speed micro thermal printer, printing test results in real time.
8、File data management: After the instrument is connected to the computer with a USB cable, it can be used as a USB disk, and the user can copy the test record file directly from the dc winding resistance tester.
9、The parameter setting is more perfect. The number, material, test winding Test phase, winding temperature, converted temperature value, etc.
10、Automatic shutdown function: if the dc winding resistance tester does not operate within 3 minutes, it will automatically shut down.
11、Power display: after the transformer dc winding resistance tester is turned on, the current battery power will be displayed on the upper right corner of the screen.
12、Under power shutdown: when the battery is low, the instrument will prompt the user and automatically shut down to Protect the battery for long-term use.
Product Function
1. Wide Measurement Range: It offers five current options (automatic, 5A, 1A, 100mA, 1mA) with a measurement range from 1μΩ to 100kΩ and a resolution of 0.1μΩ.
2. High Accuracy: The measurement accuracy is 0.2% ±2 digits with a four-and-a-half digit display.
3. Advanced Measurement Technology: It adopts current source line-based compensation technology, overvoltage protection to resist electric potential impact, and a "four-end" measurement method to eliminate measurement errors caused by line resistance and contact resistance.
4. Built-in Battery and Portability: It features a built-in large-capacity lithium-ion rechargeable battery for both AC and DC operation, making it convenient for outdoor testing. The instrument weighs only 3kg with dimensions of 260×160×80mm.
5. Data Management: It has a 5.0-inch touch true-color LCD with Chinese operation menu (English version customizable), can store 1000 test records, and features a high-speed micro thermal printer for real-time printing. When connected to a computer via USB, it functions as a USB disk for direct file copying.
6. Comprehensive Parameter Setting: It allows setting of the number, material, test winding, test phase, winding temperature, and converted temperature value.
7. Automatic Functions: It includes automatic shutdown after 3 minutes of inactivity, battery power display, and low-battery protection with automatic shutdown.
Product Advantages
1. High Precision and Wide Range: With accuracy of 0.2% ±2 digits and a range from 1μΩ to 100kΩ, it can accurately measure both very low and high resistance values.
2. Advanced Error Elimination: The "four-end" measurement method and current source line-based compensation technology eliminate errors caused by line resistance and contact resistance, ensuring accurate results.
3. Portable and Field-Ready: The built-in lithium battery and lightweight design (3kg) make it ideal for outdoor and field testing without the need for AC power.
4. Efficient Data Management: The 1000-record storage capacity, real-time thermal printer, and USB disk functionality simplify data documentation and transfer.
5. User-Friendly Interface: The 5.0-inch touch true-color LCD with Chinese menu and comprehensive parameter settings make the instrument easy to operate.
6. Reliable Protection: Overvoltage protection, automatic shutdown, and low-battery protection ensure safe and reliable operation.
제품 매개변수
기술적인 매개변수
| 유형 | integrated portable |
| Overall dimension | Length 260mm x width 160mm x height 80mm |
| 악기 무게 | 3kg |
| 내장 배터리 | DC lithium-ion rechargeable battery for both AC and DC |
| Charger input | AC220V (50±1) Hz output: DC29.4V |
| 주변 온도 | -10 ° C to 45 ° C |
| 상대습도 | ≤85% RH No condensation |
| 고도 | ≤2000m |
| Instrument power | The maximum output power of this instrument is 100W (5A current level test opening voltage 20V) |
범위 및 정확도
| item | detail | 매개변수 |
| 현재의 | 5A | Automatic、5A、1A、100mA、1mA |
| 표시하다 | Four and a half | |
| Test range | 5A | 1μΩ~4Ω |
| 1A | 20mΩ~20Ω | |
| 100mA | 200mΩ~200Ω | |
| ≤1mA | 20Ω~100kΩ | |
| 정확성 | 0.2% ±2 digits | |
Application Scenarios
1. Transformer Manufacturing: Used for factory acceptance testing to detect manufacturing defects such as material selection issues, welding problems, loose connections, missing strands, and broken wires.
2. Substation Commissioning: Essential for testing and verifying transformer windings during the commissioning of new substations or after major installation work.
3. Routine Maintenance and Preventive Testing: Used by utilities for periodic testing to detect early signs of winding degradation, connection problems, or tap changer issues.
4. Fault Diagnosis: Deployed after a transformer experiences a short-circuit fault to assess winding condition and determine if the transformer can be safely returned to service.
5. On-Site Field Testing: The built-in battery and compact design make it suitable for field testing in substations and remote locations.
6. Testing of Other Inductive Loads: Suitable for testing the resistance of transformers and other inductive loads, including motors and generators.
FAQ about Transformer DC Winding Resistance Tester
Q:What is a Transformer DC Winding Resistance Tester?
A:Transformer DC Winding Resistance Tester is a specialized instrument used to measure the DC resistance of transformer windings. It helps evaluate the condition of winding connections, conductors, solder joints, and tap changer contacts, making it useful for transformer manufacturing, commissioning, maintenance, and troubleshooting.
Q:Why is it necessary to perform dc winding resistance testing on transformers?
A:Winding DC resistance is an important parameter reflecting the condition of the internal conductive circuit of a transformer. Through testing, issues such as poor lead connections, cold solder joints, broken conductor strands, and abnormal tap changer contact can be promptly identified, preventing equipment overheating, efficiency loss, or even operational failures caused by increased contact resistance, thereby improving the safety and reliability of transformer operation.
Q:What types of transformers are suitable for use with a dc winding resistance tester?
A:The dc winding resistance tester supplier is suitable for various types of equipment, including power transformers, distribution transformers, oil-immersed transformers, dry-type transformers, rectifier transformers, traction transformers, and special transformers. It can also be used for dc resistance testing of inductive devices such as reactors and motor windings, meeting diverse testing needs in the power, industrial, and manufacturing sectors.
Q:What testing equipment is the transformer dc winding resistance tester typically used in conjunction with?
A:In comprehensive transformer testing, the dc winding resistance tester factory is typically used together with transformer turns ratio testers, insulation resistance testers, dielectric loss testers, winding deformation testers, insulating oil breakdown voltage testers, and partial discharge detection equipment. Together, they complete factory testing, acceptance testing, condition-based maintenance, and fault diagnosis, providing a comprehensive and accurate basis for evaluating the operating condition of transformers.
The UHV-5A Transformer DC Winding Resistance Tester is manufactured and supplied by Wuhan UHV Power Technology Co., Ltd., a professional manufacturer and supplier of high-voltage testing equipment. The UHV-5A is designed for accurate and reliable measurement of transformer DC winding resistance, offering a measurement range of 1μΩ to 100kΩ and high measurement accuracy. As the manufacturer and supplier, Wuhan UHV Power Technology Co., Ltd. provides professional technical support and product services. Please contact us for the latest price and a customized quotation.
