5A Large-Scale Earth Grid Ground Resistance Tester

The large-scale grounding grid resistance tester is a high-precision testing instrument used in substations and other field applications to test grounding resistance and related parameters. This instrument features high power, comprehensive functions, portability, strong anti-interference performance, and high accuracy. The instrument has an integrated structure with a built-in frequency converter module, allowing for continuous frequency adjustment of the output power. The frequency can be changed to 45.0 Hz , 50.0 Hz , 55.0 Hz, 47.5Hz / 52.5Hz , 45.0 Hz /55.0 Hz, 60.0 Hz, 65.0 Hz, 57.5Hz/62.5Hz, 55.0 Hz/65.0 Hz . It incorporates a high-speed processor core and employs advanced digital filtering technology to effectively avoid interference from power frequency electric fields, fundamentally solving the problem of accurate measurement under strong electric field interference. Extensive field testing and user feedback have shown that when conducting grounding grid testing in the harsh electromagnetic environment of operating substations, the large-scale grounding grid resistance tester provides accurate, stable, and repeatable measurement data, making it an ideal instrument for measuring the characteristic parameters of large and medium-sized grounding grids.

Extra Large LCD English Display
The instrument is equipped with a 7-inch large-screen touch-screen color display, featuring a super-large, fully touch-operated interface. Operation is simple and each process is clearly explained, requiring no additional professional training for operators. A single click completes the entire measurement process, making it an ideal intelligent dielectric loss measurement device.

Massive Data Storage
The instrument is equipped with a calendar chip and a large-capacity memory, which can store 100 sets of data. It can save the test results in chronological order, view the historical records at any time, and print them out.

Variable Frequency Technology, Precise Measurement
It has strong anti-interference capabilities. The instrument's measurement output power is provided by its built-in frequency conversion power module, which can switch between multiple frequencies. It also adopts digital filtering technology to effectively avoid various power frequency interference signals on site, enabling the instrument to achieve high-precision, accurate and reliable measurements.

High-speed Processor Chip
Precise and fast, the instrument uses a professional high-speed digital signal processor as its processing core, which greatly improves the instrument's computing power while ensuring the accuracy of the measurement data.

Intelligent Measurement And Control Throughout The Entire Process
Powered by its high-performance internal processing core, the instrument rapidly and automatically completes a series of complex calculations throughout the measurement process, including current output, voltage acquisition, and frequency conversion. The instrument can automatically determine the impedance of the current loop and adjust the output current value of the power supply accordingly (the maximum output current is the option-set current), completing the test task automatically without human intervention. The instrument measures the grounding impedance, pure resistive component, and pure inductive reactance component of the grounding grid.

PC Data Processing
The data measured by the instrument can be exported via USB flash drive, and then viewed and managed on a PC.

Multiple Frequency Options
During instrument testing, the appropriate frequency setting can be selected according to different requirements to conduct the test.

Supports Bluetooth Data Query
The instrument is equipped with a Bluetooth module, which supports Bluetooth data transmission and the protocol complies with the State Grid's "Technical Specifications for Data and Communication of Digital Testing Instruments for Electrical Equipment".

• Grounding impedance, continuity, and step/contact voltage testing for substations, power plants, and transmission lines in the power industry .
• Safety inspection and acceptance of grounding systems in industrial and mining enterprises , petroleum and chemical plants.
• Performance testing of grounding devices for communication and infrastructure base stations, airports, railways, and military facilities.
• On-site testing enables precise measurement of grounding grid parameters under strong electromagnetic interference environments and fault diagnosis of aging grounding grids.
• Project acceptance includes completion testing of grounding projects for new construction/renovation and expansion, and on-site measurement of soil resistivity.