NanpingNDZ300B Power Quality Online Monitoring Device

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NanpingPartial Discharge-Free Detection and Live On-Line Monitoring Series

Phone: 0512-66101666

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Product Description

Main Functions and Features

Safe and reliable

The voltage input employs a high‑voltage isolation module, while the current input utilizes a high‑precision current transducer, ensuring safe isolation between the input signal and the measurement system. This significantly enhances the instrument’s immunity to electromagnetic interference.

Easy to use

It features a Chinese-language interface and simple button-based operation, making it easy for users to operate.

High precision

Meets the requirements of Class A instruments under national standards. It employs reference algorithms for harmonics, three-phase unbalance, flicker, and voltage fluctuations, with no approximations.

The computation employs a high-precision A/D converter (16 bits), with simultaneous sampling at a rate of 12.8 kHz.

Powerful software features

Employing a DSP+ARM+CPLD core architecture, the instrument delivers high processing speeds and robust software functionality, making it well-suited for complex testing applications.

Performing data processing tasks has significantly enhanced testing efficiency and quality.

Communication interface (RS-485, Ethernet port)

Many test parameters

System frequency, power grid harmonics, three-phase voltage unbalance, voltage fluctuations and flicker, voltage deviation, fundamental voltage RMS value

Value and true RMS, fundamental current RMS and true RMS, fundamental active power, active power, fundamental apparent power, 2–63

Subharmonics, true power factor, and all other parameters specified in the five major national standards for power quality.

Large-capacity storage

The device features 512 MB of built-in memory and stores data in 5-minute intervals, with a single channel capable of retaining one year’s worth of historical data.

The benchmark algorithm provides exact calculations for harmonics, three-phase unbalance, flicker, and voltage fluctuations, without any approximations. It employs a high‑precision 16‑bit A/D converter with simultaneous sampling at a rate of 25.6 kHz, meeting the requirements of Class A instruments as specified in national standards.

Technical indicators

Frequency measurement

Measurement range: 45–65 Hz, nominal frequency 50 Hz; measurement conditions: the fundamental component of the signal shall be no less than 80% of full scale.

Measurement error: ≤0.01 Hz

Input voltage range: AC 10–120 V or AC 10–400 V

Input current range: 5 A / 1 A

Fundamental voltage and current amplitudes: The permissible error for fundamental voltage is ≤0.5% of full scale; the permissible error for fundamental current is ≤1% of full scale.

Measurement error of the phase difference between fundamental voltage and current: ≤0.5°

Harmonic voltage distortion measurement error: ≤0.1%

Harmonic current distortion measurement error: ≤0.2%

Three-phase voltage unbalance error: ≤ 0.2 %

Three-phase current unbalance: ≤1%;

Voltage deviation error: ≤0.2%

Voltage variation error: ≤0.2%

Power error: ≤0.5%

Flicker error: ≤5%

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