In the field of DC resistance testing for power transformers, transformers, and other equipment, measurement efficiency, data accuracy, and operational safety have always been the focus of technical personnel's attention. With the improvement of device intelligence, the new generation of DC resistance testers has achieved systematic optimization in power technology, control methods, and data management. This article focuses on the SXR-10P DC resistance tester, analyzing its technical architecture, core functions, and practical applications for reference by relevant technical personnel.

1、 Equipment positioning and technical characteristics

SXR-10P DC Resistance Tester is a specialized instrument designed for rapid measurement of DC resistance of transformers with voltage levels of 110kV and below. The device adopts a new power technology and has been comprehensively optimized in terms of volume, weight, output capability, and anti-interference performance. Using a high-speed microcontroller as the control core, it has a high degree of automation and supports automatic discharge and discharge alarm functions. The built-in lithium battery can meet the testing needs in an environment without mains power access on site.

2、 Core parameters and measurement capabilities

From the perspective of technical indicators, SXR-10P has the following characteristics:

Test current gear: Supports automatic selection of AUTO mode, as well as multiple gears of<20mA, 40mA, 200mA, 1A, 5A, 10A, covering measurement needs in different resistance ranges.

Measurement range and accuracy: The measurement range at 10A gear is 0.5m Ω~0.8 Ω, with an error limit of ± (0.2%+2 words); The measurement range is extended to 100 Ω~100k Ω in the<20mA gear, with an error limit of ± (0.5%+2 words). The minimum resolution is 0.1 μ Ω, which can meet the requirements of fine measurement.

Output voltage: up to 24V, facilitating the selection of larger test currents in high resistance situations and improving testing speed.

● Display system: Equipped with a seven inch high brightness touch color LCD screen, the display is clear under strong light, supports full touch screen operation, and the interface is switchable between Chinese and English.

3、 Intelligent control and human-computer interaction

The SXR-10P has achieved various intelligent designs in terms of control modes:

● Mobile APP remote control: It supports Android mobile phones or tablets to download special APP by following WeChat official account to realize the whole process remote control operation. Test data can be stored and uploaded for on-site data management and later reference.

Data storage and communication: Built in perpetual calendar clock and power down storage function, capable of storing 1000 sets of test data. Equipped with Bluetooth communication, RS232 communication, and USB interface, supporting computer communication and USB data export.

On site printing: Equipped with a panel type micro printer, it can print measurement results in Chinese, making it convenient to issue test records on site.

4、 Security protection and auxiliary functions

The device has been designed with consideration of various protection requirements for on-site abnormal situations:

● Back electromotive force impact protection: It has multiple protection functions such as back electromotive force impact, disconnection during testing, power outage, and power overheating, which can effectively suppress the impact of back electromotive force on the instrument and synchronously trigger sound and light alarms.

● Automatic discharge and alarm: After the test is completed, the discharge process is automatically executed, accompanied by discharge alarm prompts, reducing the risk of manual operation.

Intelligent power management: Through power management technology, the instrument operates at the minimum rate, reducing heat and energy consumption, and improving endurance and stability.

5、 Practical Function Design

● Temperature conversion function: Supports the conversion of resistance values of copper and aluminum materials at any temperature. Users can touch and input the winding temperature and conversion target temperature, improving the flexibility of on-site data analysis.

Test line configuration: Standard 10 meter test line, customizable length to meet the wiring needs of transformers of different sizes.

● Portability design: The host and cable box are designed separately, with a weight of 6kg for the host and 5kg for the cable box. The overall structure is compact, making it easy to carry and arrange on site.