Power quality monitoring仪It is a device used in the power system to detect various power quality issues. It can effectively monitor parameters such as voltage, current, frequency, and power factor, thereby timely detecting and solving power quality problems. However, the comprehensiveness and accuracy of power quality monitoring instruments in the power system are issues of great concern to users. This article will discuss from a technical perspective and analyze how to achieve the comprehensiveness and accuracy of power quality monitoring instruments.

1、 Achieve comprehensive monitoring

The selection of monitoring points is a key factor affecting the comprehensiveness of monitoring, and monitoring points should be selected based on the actual situation and importance of the power system. For example, in AC substations, important points such as the high-voltage side, low-voltage side, and busbar of the main transformer should be selected; In the distribution network, key points such as capacitors, load centers, peak appliances, and grounding resistors should be selected. In addition, a corresponding monitoring point database should be established to achieve comprehensive monitoring.

The selection of monitoring parameters is another key factor affecting the comprehensiveness of monitoring. In addition to traditional parameters such as voltage, current, frequency, and power factor, other parameters should also be selected based on the actual situation of the power system. For example, in AC substations, parameters such as harmonics, transients, and transients should be selected; In the distribution network, parameters such as voltage imbalance, current imbalance, and voltage fluctuation should be selected.

The selection of monitoring time is also a key factor affecting the comprehensiveness of monitoring. The monitoring time should be selected according to the load changes and transient voltage fluctuations of the power system, and different monitoring time periods should be selected. The monitoring period should be long enough and cover important load change periods as much as possible. For example, in industrial areas, heavy loads should be selected during the day and night; In residential areas, morning and evening should be chosen.

2、 Achieve monitoring accuracy

The accuracy of monitoring instruments is a key factor affecting monitoring accuracy, and high precision and reliability monitoring instruments should be selected. In general, the accuracy of monitoring instruments should reach level 0.5 or higher, and they should be able to withstand high voltage and high current surges for a short period of time. The calibration and calibration system is a key factor in ensuring the accuracy of monitoring instruments. Before using monitoring instruments, strict calibration and calibration should be carried out. During use, regular recalibration and recalibration should be carried out to ensure the accuracy of monitoring data.

The processing and analysis of data is an important factor in ensuring the accuracy of monitoring. A comprehensive data processing and analysis system should be established to process and analyze monitoring data, identify the root causes and solutions of power quality problems. For some complex power quality issues, data analysis and processing methods such as artificial intelligence and machine learning should be used.

In summary, the comprehensiveness and accuracy of power quality monitoring instruments are key factors in ensuring the stable operation of the power system and improving energy utilization efficiency. It is necessary to select appropriate monitoring points and parameters, and establish corresponding databases; Only by selecting high-precision monitoring instruments, establishing a reasonable calibration and calibration system, and strengthening data processing and analysis can the comprehensiveness and accuracy of power quality monitoring instruments be achieved.