Table of Contents

Overview

With the widespread application of power electronic equipment, non-linear loads keep growing, which leads to continuously rising harmonic content in power grids. Harmonic pollution poses hidden dangers to the safe, stable and economical operation of power systems and severely impacts the surrounding electrical environment: it consumes the reactive power reserve of the grid, raises transmission line losses, causes extra heat loss and shortened service life of motors, brings errors to electric energy metering, and triggers maloperation or refusal of sensitive automatic control & protection devices, reducing overall system reliability.

Our newly developed power quality online monitoring device can monitor and analyze fundamental waves as well as the 2nd to 25th harmonics of voltage and current on busbars and power lines in real time. It uploads collected data to the background monitoring system via RS485 or RS232 communication ports to meet all power quality monitoring demands.

This device is applicable to power supply systems of power plants, substations, petroleum, coal, steel, metallurgy, chemical plants and other large industrial enterprises with voltage levels ranging from 380V up to 220kV.

Functions & Features

Equipped with advanced industrial-grade CPU, featuring fast computing speed, stable running performance and strong anti-interference capability.
Adopts automatic frequency locking technology to ensure accurate analysis results even when grid frequency fluctuates.
Calculation based on Fast Fourier Transform (FFT), enabling rapid and precise daily monitoring of fundamental components, 2nd~25th harmonic voltage/current and total harmonic distortion rate on power lines.
User-friendly Chinese display interface with simple, intuitive operation.
Able to store up to 60 over-limit event records.

Main Technical Specifications

Environmental Conditions

Item	Specification
Installation Location	Indoor, well-ventilated space
Ambient Temperature	-10℃ ~ +50℃
Relative Humidity	≤90%, no condensation on surface
Atmospheric Pressure	80 ~ 110 kPa
Altitude	Less than 2000 m
Surrounding Environment	Free of conductive dust, corrosive gas and mould that damage metals or insulation materials

Electrical Technical Parameters

Item	Detailed Parameter
Working Power Supply	AC/DC 220V; customized supply available upon order request Power consumption ≤ 20W
Voltage Measuring Range	5 ~ 450V PT loop power consumption: 0.5VA per phase
Current Measuring Range	0.06A ~ 6A CT loop power consumption: 0.5VA per phase
Communication Interface	Optional RS232 / RS485 (confirm when placing order) Baud rate: 600 ~ 19200 bps
Communication Protocols	Serial Port 1: Private internal protocol Serial Port 2: IEC 60870-5-103 / Modbus protocol

Rear Panel Layout Instructions of the Monitoring Device

Terminals N and L: Working power supply input, supports AC/DC 220V input.
Terminals UA, UB, UC, UN: Voltage measurement inputs, measuring range: 0~400V.
Terminals IA, IB, IC: Current measurement inputs (0~6A); the marked terminal stands for the polarity input end of current.
RS232/485: Primary communication interface (Refer to Figure 4.2).
BJ and BJCOM: Passive alarm interface (normally open relay contacts).
RS232/485 (2): IRIG-B time synchronization interface.

Installation Steps for Single Channel Power Quality Monitor

Drill an opening on the fixed power distribution cabinet.
Take out the device and the mounting buckles.
Insert the instrument into the mounting opening from the front side (See Figure 8.1).
Fasten the screws of mounting buckles to secure the instrument firmly.

Installation Steps for Single Channel Power Quality Monitor

Cutout Dimension

FAQ – Single Channel Power Quality Monitor

Q1: What is a Single Channel Power Quality Monitor used for?

A1: It is designed for real-time online monitoring of single-circuit power grid parameters, including voltage, current, 2nd–25th harmonics, total harmonic distortion and power anomalies, ensuring safe and stable operation of distribution systems.

Q2: What voltage and current range does this monitor support?

A2: The device supports voltage input from 5V to 450V and current input from 0.06A to 6A, suitable for most low and medium voltage power distribution scenarios from 380V up to 220kV systems.

Q3: What harmonic analysis function does it provide?

A3: It adopts FFT algorithm to accurately analyze fundamental wave and 2nd to 25th harmonic voltage and current, and calculates THD in real time for daily power quality evaluation.

Q4: What communication interfaces and protocols are available?

A4: It provides optional RS232 or RS485 interface, supporting Modbus and IEC103 protocols. It realizes remote data upload, background monitoring and system data integration.

Reviews

There are no reviews yet.

Be the first to review “HF-PQ-201 Single Channel Power Quality Monitor”