NDDW-Ⅲ Large Ground Grid Ground Resistance Tester

Product Introduction

        Large Ground Grid Ground Resistance Tester is a high-precision testing instrument used in various field applications such as substations for measuring ground resistance and related parameters. The instrument features a compact size, light weight, portability, strong anti-interference capability, and high accuracy. It has an integrated structure with a built-in variable frequency power supply module, allowing continuous adjustable output power frequency. The frequency can be switched to 45Hz or 55Hz. Equipped with a high-speed processor core and advanced digital filtering technology, it effectively avoids interference from power frequency electric fields, fundamentally solving the challenge of accurate measurement under strong electric field interference.

        Extensive field tests and user feedback indicate that when performing ground grid tests in the harsh electromagnetic environment of operational substations, the Large Ground Grid Ground Resistance Tester provides accurate, stable, and repeatable measurement data, making it an ideal instrument for measuring characteristic parameters of large and medium-sized ground grids.

Product Features

☆、Fully Touch-Sensitive Large LCD Display

       Simple operation. The instrument is equipped with a high-end fully touch-sensitive LCD display and an oversized graphical interface, making each step clear and intuitive. Operators can use it without additional professional training. A light touch completes the entire measurement process, making it an ideal intelligent measuring device.

☆、Frequency Conversion Technology, Precise Measurement

       Strong anti-interference capability. The instrument's measurement output power is provided by an internal variable frequency power supply module, with frequencies switchable to 45Hz or 55Hz. Utilizing digital filtering technology, it effectively avoids various on-site power frequency interference signals, enabling high-precision, accurate, and reliable measurements.

☆、DSP High-Speed Processor

       Precise and fast. The instrument uses a professional DSP fast digital signal processor as its core, greatly enhancing computational processing capability while ensuring measurement accuracy.

☆、Intelligent Measurement and Control Throughout the Process

       Supported by a high-performance internal processing core, the instrument automatically and quickly completes a series of complex operations such as current output, voltage collection, and frequency conversion during the measurement process. It automatically judges the impedance of the current loop and automatically adjusts the output current value of the variable frequency power supply (rated output current 5A) without manual intervention, completing the test automatically. Measurement content includes ground grid impedance Z, pure resistance component R, and pure inductive reactance component X.

☆、Mass Data Storage

       The instrument is equipped with a calendar chip and large-capacity memory, storing test results in chronological order. Historical records can be viewed at any time and printed out.

☆、PC Data Processing

       Measured data can be exported via USB drive for viewing and management on a PC.

Technical Parameters

☆、Operating Conditions: -15℃~40℃ RH＜80%
☆、Anti-Interference Principle: Frequency Conversion Method
☆、Power Supply: AC 220V±10%  Generator allowed
☆、Measurement Output Current: 1A~5A adjustable
☆、Measurement Output Voltage: 0V~100V
☆、Test Power Frequency: 45, 50, 55, 60, 65Hz single frequency
                            45/55, 55/65    47.5Auto Frequency Conversion /52.5Hz

☆、Rated Output Power: 500W
☆、Resolution: Ground Impedance: 0.0001; Impedance Angle: 0.0001°
☆、Accuracy
      Ground Impedance: ±(1% reading +0.002)
      Impedance Angle: ±(1% reading +0.02°)
      Resistance Measurement Range: 0.001Ω~5kΩ
☆、Dimensions: 370×295×225
☆、Memory Capacity: 100 groups, supports USB data storage
☆、Unit Weight: 13kg