Working principle

The working principle of the online monitoring device for power quality can be summarized as four core steps: perception, conversion, analysis, and transmission, forming a complete monitoring loop.

Data acquisition (perception): The device collects real-time raw voltage and current signals in the power grid through high-precision voltage and current transformers. These sensors are like the "ears" and "eyes" of the device, responsible for receiving initial analog signals and ensuring the safe isolation of the measurement system from the high-voltage power grid.

Signal processing (conversion): The collected analog signal is sent to the data acquisition module. Here, the analog signal is converted into a digital signal through a high-speed and high-precision analog-to-digital converter. High performance multi-core processors (such as DSP, ARM) then perform precise calculations and preliminary analysis on these digital signals, such as calculating the effective values of voltage and current, frequency, harmonics, and other basic parameters.

Data analysis and diagnosis (analysis): This is where the "brain" of the device is located. Embedded systems or built-in intelligent analysis software will deeply mine the processed data, determine whether various indicators exceed the standard according to international and domestic standards such as IEC 61000-4-30, identify the types of power quality problems (such as harmonic exceedance and voltage sag), and generate alarm events.

Data storage and transmission (transmission): The device has a built-in large capacity memory that can record historical data and waveforms for a long time. At the same time, through the communication module, the device supports multiple methods such as Ethernet, fiber optic, GPRS, etc., to upload data in real-time to the backend monitoring center or cloud platform, achieving remote monitoring and management.

Core function

Based on the precise workflow mentioned above, the online monitoring device for power quality plays an irreplaceable role in various aspects of the power system.

Real time monitoring and warning: The device can continuously monitor the power quality 24/7. Once parameters exceed the limit (such as high voltage or harmonic exceeding the standard), an immediate warning will be issued to remind operation and maintenance personnel to intervene in a timely manner, avoid the expansion of accidents, and transform traditional passive maintenance into active prevention.

Problem diagnosis and optimization: When equipment malfunctions or is damaged, the recorded data (such as voltage sag waveform at the time of the fault) is the "black box" for accident retrospective analysis, which can help accurately locate the cause of the fault. Meanwhile, long-term data records also provide scientific basis for optimization measures such as power grid renovation and reactive power compensation device configuration.

Compliance assessment and management: It provides objective data evidence for power suppliers and consumers to evaluate whether the power quality meets national standards or industry agreements. It is a key tool for resolving disputes between supply and demand parties and implementing regulatory requirements.

Supporting the development of new power systems: In distributed photovoltaic, wind power and other new energy grid connection points, as well as places sensitive to power quality such as electrified railways and data centers, this device is an important infrastructure to ensure their safe grid connection and stable operation.