DC Resistance Tester

Testing the DC resistance of a transformer is a mandatory procedure during the ex-factory inspection of semi-finished and final products, as well as during installation, acceptance testing, and preventive maintenance conducted by the electric power department. This test effectively identifies manufacturing defects such as improper material selection for transformer coils, poor welding, loose connections, missing strands, and broken wires, as well as potential issues that may arise after operation.

To meet the demand for rapid measurement of transformer DC resistance, our company has developed a new generation of DC resistance testers based on our technological expertise. This instrument incorporates advanced power technology and is characterized by its compact size, lightweight design, and high output current. The device is controlled by a microcontroller, which enables automatic self-inspection, data processing, and display functions. It also features automatic discharge and audible alarm indications. The tester offers high accuracy, ease of operation, and the ability to quickly measure transformer DC resistance.

Transformer DC resistance testing is essential during various stages of transformer manufacturing and maintenance, including factory testing of semi-finished and finished products, installation, overhaul, tap changer replacement, handover testing, and preventive maintenance in the power sector. This test helps evaluate the welding quality of winding joints, detect short circuits between turns, and verify the functionality of the voltage tap changer contacts. It also checks the alignment of the actual tap changer position with the indicated position, the integrity of lead wires, and the condition of multi-strand wires, including the detection of any breaks in the strands.The tester is controlled by a high-speed microprocessor, ensuring high automation with functions such as automatic discharge and discharge alarms. The instrument provides high test accuracy, is easy to operate, and allows for rapid measurement of transformer DC resistance, making it an indispensable tool for transformer testing.

To meet the fast measurement requirements of DC resistance in transformers, we developed the HZ-3110B DC Resistance Tester. The instrument features advanced technology, compact size, lightweight design, high output current, and other notable characteristics.

The device is controlled by a microcontroller, offering a high degree of automation and automatic discharge functions. It is a high-precision testing instrument that allows for simple and direct fast transformer measurements.

To meet the fast measurement requirements for DC resistance in transformers, we developed the HZ-3110 DC Resistance Tester. The instrument features advanced technology, a compact size, lightweight design, high output current, and other notable characteristics.The device is controlled by a microcontroller, offering a high degree of automation and automatic discharge functions. It is a high-precision testing instrument that allows for simple and direct measurement of transformer DC resistance.

To meet the needs for rapid DC resistance measurement of transformers, our company has developed the HZ-3120A DC Resistance Tester. The instrument incorporates advanced power supply technology and features a compact design, lightweight construction, high output current, excellent repeatability, strong anti-interference capabilities, and comprehensive protection functions. The entire system is controlled by a high-speed microcontroller, offering a high degree of automation along with automatic discharge and discharge alarm functions.

To meet the need for rapid measurement of transformer DC resistance, our company developed the HZ-3140A DC Resistance Tester. The instrument features advanced power supply technology, with characteristics including a compact size, lightweight design, high output current, excellent repeatability, strong anti-interference capability, and comprehensive protection functions.The entire system is controlled by a high-speed microcontroller, offering a high degree of automation along with automatic discharge and discharge alarm functions. The instrument provides high-accuracy testing, is easy to operate, and enables the rapid measurement of transformer DC resistance.

The Winding Resistance Tester is an essential tool in the electrical industry, used to measure the resistance of winding coils in transformers, motors, and generators. Its high precision, user-friendly interface, wide measurement range, and temperature compensation features make it crucial for preventive maintenance, quality control, and field testing. By ensuring accurate measurements, this device helps identify potential electrical faults, enhancing the reliability and efficiency of electrical systems. Companies like Huazheng Electric emphasize the importance of such testing equipment in maintaining high operational standards.

Accurate measurement of winding resistance is vital for ensuring the proper functioning and reliability of electrical equipment. This tool helps detect potential issues such as poor connections, short circuits, and other faults that could lead to costly downtime or equipment failure.

The Portable DC Winding Resistance Tester is an innovative product with a compact design, hand-held operation, and enhanced portability for easy carrying.This instrument is not only suitable for measuring transformers, mutual inductors, reactors, and other inductive test products, but also for testing copper bars, conductors, switch contacts, and other resistive components. The tester offers fast testing speed and high accuracy.

To meet the requirement for rapid DC resistance measurement of transformers, our company has developed a three-channel DC resistance tester specifically designed for YN-connected windings. The tester offers several advanced features, including simultaneous energization of all three phases, independent current and voltage sampling, and the ability to simultaneously measure and display the three-phase resistance values and the three-phase unbalance rate. This significantly reduces the test time required for measuring the DC resistance of transformers and addresses the issue of long test durations for each tapped winding of electric power transformers. The tester requires only one-third of the time compared to traditional methods.

The instrument can simultaneously measure the three-phase winding DC resistances of a transformer. For on-load tap-changing transformers, there is no need for discharging, and the tapping can be adjusted directly using the instrument. The measurement time is reduced to one-third of the time required by traditional single-phase methods, greatly shortening the overall testing time. The entire instrument is controlled by a microcontroller (SCM), which automatically performs functions such as self-checking, data processing, and display. Additionally, the instrument features automatic discharging and an audible discharge alarm. With advantages such as stable test data, high accuracy, fast operation, and excellent repeatability, this instrument is the ideal choice for on-site measurement of transformer DC resistance.

To meet the need for rapid measurement of transformer DC resistance, our company has developed a large-scale power transformer DC resistance tester that integrates Three-Phase simultaneous testing, Magnetic Augment Function, and Degauss Function into a single unit. This tester features simultaneous three-phase power-on, independent current and voltage sampling, and the ability to simultaneously measure and display three-phase resistance and the three-phase unbalance rate. These capabilities significantly reduce the testing time for transformer DC resistance and address the issue of long measurement times typically required for the DC resistance of each tap winding in power transformers.