Single Phase Three Phase 20A Transformer DC Winding Resistance Tester| XHZ1320A

For the power system, the transformer is the core equipment, and its long-term reliable operation is critical to the stability and reliability of the entire system. DC resistance measurement is a mandatory test item for semi-finished products, finished product factory testing, installation, handover testing, and preventive testing by power utilities. It effectively detects manufacturing defects such as improper material selection, poor welding, loose connections, missing strands, and broken wires in transformer coils, as well as operational defects and hidden hazards.

To meet the demand for rapid DC resistance measurement, the XZH TEST XHZ1320A integrates magnetic assist testing, three-phase simultaneous measurement (Yn, Y, △), and automatic demagnetization into a single portable instrument. It is the ideal solution for measuring DC resistance in large power transformers. Featuring a 7-inch industrial-grade true-color touch display with jog dial control, a Chinese/English menu interface, and one-time wiring for complete DC resistance testing, the XHZ1320A delivers fast testing speed, high accuracy, and an ultra-wide measurement range — purpose-designed to support preventive maintenance programs and post-fault diagnostic workflows.

• Three-Phase Simultaneous Testing: Supports Yn, Y, and △ winding configurations with automatic three-phase unbalance rate calculation — reduces per-transformer testing time by over 60% compared to sequential single-phase methods, critical for fleet-scale preventive maintenance cycles.
• Magnetic Assist Technology: Pre-saturates the transformer core to dramatically shorten current stabilization time on large high-inductance windings, enabling rapid turn-around during scheduled maintenance windows.
• Built-In Demagnetization: Automatically removes residual core magnetism after DC testing — essential in maintenance workflows where the transformer must be returned to service immediately after testing to avoid inrush current incidents.
• Stability Verification: Calculates resistance change rates at 5S, 15S, and 30S intervals, providing objective data stability metrics to prevent erroneous readings and ensuring reliable trending across maintenance cycles.
• Field-Ready Protections: Anti-back EMF protection, wire break detection, and power failure data preservation safeguard both operators and test data in challenging field environments.
• Rapid On-Site Reporting: Built-in thermal printer generates immediate test reports; 200-record internal storage with USB mass transfer supports long-term maintenance history tracking.
• 7-Inch Touch + Jog Dial: High-resolution 1024×600 industrial display with combined touch and jog dial operation — minimizes gloves-off time in field conditions while providing intuitive menu navigation.