Import 5a Transformer Dc Windin — Buy in wholesale FOB from Supplier in China

The 5A Transformer DC Winding Resistance Tester from Wuhan GDMK Electric Co., Ltd is a portable microprocessor-controlled instrument for measuring direct current resistance of transformer windings and other inductive low-resistance components. It delivers a 5A test current with four-terminal (Kelvin) measurement to eliminate lead and contact resistance errors. The unit features a backlit Chinese liquid crystal display, overvoltage protection against potential transients, and an integrated panel printer for hardcopy results. Wuhan GDMK Electric is based in Jiangxia District, Wuhan, China, though manufacturing scope and certification details are not stated.

Transformer DC winding resistance measurement is mandated in power equipment test regulations as the second-ranked test item, applied after overhaul, minor repair, tap changer adjustment, fault investigation, and pre-commissioning preventive tests. The four-terminal measurement method separates current injection from voltage sensing, giving microhm-level resolution that two-wire methods cannot achieve. Typical measurement ranges for 5A instruments span from single-digit microhms to tens of ohms, covering distribution transformers through large power transformers. The current-source line-based compensation technology mentioned by the supplier improves stability and repeatability under inductive load conditions, where settling time can extend to minutes on large transformers.

This instrument targets electric power utilities, transformer maintenance contractors, industrial plant engineers, and high-voltage equipment service firms. Buyers should confirm with Wuhan GDMK Electric whether the 5A rating refers to maximum continuous output or pulsed capability, as thermal limitations affect sustained testing of high-inductance windings. The supplier lists multiple product name variations, suggesting OEM or white-label supply flexibility. Protocol support, communication interfaces for data export, and software compatibility are not specified and require direct inquiry.

Wuhan GDMK Electric Co., Ltd operates from Jiangxia District Economic Development Zone, Daqiao New District, Huangjiahu Avenue, Wuhan, postal code 430200, China. The supplier holds a harbor trust tier, representing basic platform verification without advanced audit or assessment. Response rate and average response time are both recorded at zero, indicating no historical engagement metrics are available through the platform channel.

The company's listing describes transformer test equipment with emphasis on DC resistance measurement, winding analysis, and microprocessor-controlled instrumentation. No information is provided about year of establishment, factory floor space, research and development staff count, annual production capacity, revenue figures, or specific quality management system certifications. The source description contains extensive product name variations and technical claims about measurement precision and speed, but lacks certificate numbers, calibration accreditation, or reference customer installations. Buyers should request business registration, ISO 9001 or equivalent certification, and calibration laboratory accreditation directly from Wuhan GDMK Electric.