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The SHDFR_PQ (Online Power Quality Monitoring Device) is a high-precision device specifically for monitoring power quality online. It has such functions as high-precision monitoring of power quality steady state indices, recording of transient power quality events, real-time measurement and monitoring of the power and quantity of electricity, recording of power quality events, pass-rate statistics, comprehensive analysis of monitoring data for power quality problems, report statistics and output. With these powerful functions, the device meets the requirements of various likely power quality monitoring scenarios.

? Modeling according to the IEC 61850 standard: Modeled on the latest IEC 61850 standards, it is interoperable with other smart devices and can be integrated with other intelligent systems to achieve data sharing.
? Flexible and extensible communication ports: Its communication ports support communication protocols commonly used for power systems such as IEC 61850 8-1/103/104, while the protocols are extensible.
? High precision: Its high-performance and professional algorithm ensure that the measurement precision for data collection and monitoring criteria are higher than the level-A equipment requirement of the national standard.
? High-order harmonic monitoring capability: Supporting harmonic and inter-harmonic monitoring, with measurement precision higher than the level-A equipment requirement of the national standard.
? High-precision time mark for sampling point:
Each sampling point has an absolute time mark, with a deviation of ＜1us; it supports multiple time synchronization methods such as PPS (pulse per second) and IRIG-B.
? Internationally accepted data formats: It supports internationally accepted power quality data formats and PQDIF.
? Ability of super-long data recording: Compression technology is adopted so that data can be saved for up to half a year.
? Convenient data retrieval function: User can view historical data of any period of time by inputting the time interval.
? Multi-channel connection flexibly configured: The number of channels connecting to the device can be flexibly selected according to user needs; the device supports the analog connection of 96 channels at most.
? Extensible platform with open functions: The same device can, according to user needs, flexibly select a single power quality function device or a device integrating power quality, fault recording, and other functions.

Main Purposes

The SHDFR_PQ can be widely applied in power transmission and distribution networks, traditional power plants, electrified railways, new energy enterprises such as wind power companies, and major industrial and mining enterprises. As it is a fixed device, it can be customized as a device with a single monitoring point (a set of voltage and a set of current) or a product with multiple monitoring channels to meet monitoring requirements in various scenarios.

Main Functions

At important power transmission points and sensitive load points, the SHDFR_PQ can be set to achieve online monitoring for various power quality indices.

一、Steady State Function

? Frequency monitoring

? Voltage monitoring

? Harmonic/inter-harmonic monitoring

? Power monitoring

? Three-phase imbalance factor monitoring

? Voltage fluctuation monitoring

? Flickering monitoring

? Steady state event recording

? Pass-rate statistics

? Comprehensive analysis and statistics of monitoring data

二、Transient Function

? Transient voltage rise recording

? Transient voltage drop recording

? Short-time voltage interruption recording

? Transient state event recording

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