20A Low Resistance Ohmmeter for Transformer
High Accuracy Automatic Digital Winding Resistance Meter
This Portable Lithium Battery Transformer DC Resistance Tester is a field-oriented testing instrument designed for measuring DC resistance of medium and low voltage transformer windings (10kV-35kV). Ideal for routine maintenance, emergency fault diagnosis, and handover inspection in substations, power distribution stations, and industrial workshops, it integrates high-capacity lithium battery and constant current source technology, enabling cable-free operation in field environments without external power supply.
Key Features
Ultra-High Measurement Accuracy: Resistance accuracy up to ±0.05% FS, meeting testing requirements for high-end power transformers and precision inductive equipment
Multi-Current & Wide Range: 10 automatic switching ranges with maximum test current DC 20A, suitable for transformers of all voltage levels and capacities
Automatic Calibration & Zeroing: Built-in standard resistance calibration module supports automatic zero and full-range calibration for long-term measurement stability
Professional Data Analysis: Automatically calculates unbalance rate, supports historical data trend analysis and standard value comparison for fault diagnosis
Rich Communication Interfaces: RS485, Ethernet and USB 3.0 connectivity, supporting PC software connection and remote centralized control
Technical Specifications
| Measurement Items |
DC resistance, phase resistance, interphase resistance, unbalance rate |
| Measurement Range |
0.0001Ω~5000Ω (10 automatic ranges) |
| Measurement Accuracy |
±0.05% FS (1mΩ~5000Ω) |
| Test Current |
DC 0.1A/1A/5A/10A/20A (programmable) |
| Working Power Supply |
AC 220V ±5% 50Hz ±1% (power purification required) |
| Data Storage/Export |
2000 groups / PDF/Excel/Word export |
| Communication Interfaces |
RS485, Ethernet, USB 3.0 |
| Working Environment |
0℃~+40℃; Humidity ≤80% RH (no condensation) |
| Protection Grade |
IP20 |
| Net Weight |
19kg |
About Sansion Power Electric
Established in 2005, Sansion Power Electric has over 20 years of experience in R&D, manufacturing, and marketing of power electrical testing products. Our solutions are widely used in power electric, railroad, energy conservation, environment protection, water conservancy, petrochemical industry, aerospace, and other fields.
Our facility includes R&D department, instruments manufacturing workshop, HV workshop, sample exhibition room, HV testing laboratory, quality control department, and employs over 80 staff including 20 technical engineers. We maintain IS09001 quality system certification and all products strictly conform to international IEC and Chinese state standards.
Frequently Asked Questions
Is your company a sales company or a manufacturer?
Sansion Power Electric Co., Ltd. is an industrial and trade enterprise with its own factory, self-produced and self-sold. Founded in 2005, we have twenty years of production experience with reliable production lines, test rooms, and R&D centers.
Whether the goods are in stock, whether they can be customized, and how long the delivery time is?
After ordering, we can customize products according to special customer requirements using the latest technology. Delivery time is typically within 10 working days under normal circumstances.
Is the quality guaranteed?
We use imported components extensively and conduct three quality inspections before shipment. Export products are uniformly packed in non-fumigation wooden boxes to ensure quality.
What are the after-sales terms?
We offer free consulting service, one year warranty, and utilize various methods including email communication, video calls, and technical support to resolve any after-sales problems promptly.
What are the cooperative countries or regions?
Our products have been successfully exported to the United States, France, Brazil, Australia, Spain, Portugal, Oman, Russia, the Netherlands, Indonesia, Bangladesh, Saudi Arabia, Chile, Colombia, Panama, Malaysia, and other countries and regions.
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