NDDW-IV 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 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 harsh electromagnetic environments such as 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

☆、Full Touch Large LCD Display

   Simple operation. The instrument is equipped with a high-end full-touch LCD screen and an oversized graphical interface, making every 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 measurement device.

☆、Frequency Conversion Technology, Precise Measurement

   Strong anti-interference capability. The instrument's built-in variable frequency power supply module provides output power, with frequencies switchable to 45Hz or 55Hz. Combined with digital filtering technology, it effectively avoids on-site power frequency interference, ensuring high-precision, accurate, and reliable measurements.

☆、DSP High-Speed Processor

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

☆、Full Process Intelligent Measurement and Control

   Supported by a high-performance processing core, the instrument automatically and quickly completes complex operations such as current output, voltage acquisition, and frequency conversion during the measurement process. It automatically judges the impedance of the current loop and adjusts the output current value of the variable frequency power supply accordingly (rated output current is 5A), completing tests without manual intervention. Measurement includes the ground grid's ground 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 review 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~400V

☆、Test Power Frequency: 45, 50, 55, 60, 65Hz

   Single Frequency 45/55, 55/65, 47.5/52.5Hz automatic dual frequency

☆、Rated Output Power: 2000W

☆、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: 370×295×358 mm

☆、Memory Capacity: 100 groups, supports USB data storage

☆、Unit Weight: 22 kg