Public power supply points for important substationsPower quality monitoringdeviceMain technical indicators: power supply frequency, voltage deviation, three-phase voltage imbalance, negative sequence current, active power, grid harmonics, and power factor. Control content: The power supply frequency control has been undertaken by the power dispatch center, and power quality control mainly refers to issuing alarms or control commands when indicators such as voltage deviation, three-phase voltage imbalance, and grid harmonics exceed the limit.

The continuous monitoring task is mainly carried out by theAC Power Quality MonitorComplete.Mainly suitable for testing methods that require mastery of power supply quality without the need for continuous testing or without the conditions for continuous testing. Quality inspection of power supply at public points of residential, commercial, and small factory power supply systems. According to the importance level, it is generally sufficient to conduct a monthly or quarterly inspection, and the patrol inspection task is mainly composed ofPortable power quality analyzerOr complete with a handheld harmonic analyzer.

Voltage fluctuations and flicker indicators do not require continuous online monitoring. If the load changes little within the power supply range, it is generally sufficient to conduct a test once every six months or a year. The measurement of voltage fluctuations and flicker can be carried out by a flicker meter or portablePower quality analyzerComplete.Applicable to the detection method before and after the interference source equipment is connected to the power grid (or changes in capacity), to determine the background status of the power quality indicators of the power grid, and to verify the actual amount of interference or the effectiveness of technical measures.

This monitoring task is generally completed by a portable power quality analyzer. While completing power quality detection and monitoring, the selection of power quality monitoring points will directly affect the detection and monitoring results. The setting of power quality monitoring points should cover the main network and all power supply voltage levels, and be evenly distributed within the power grid. Meet the requirements for adjusting and controlling power quality indicators.

Meet the requirements of special users and users who have signed contracts with power quality indicators. The specific settings of various detection methods and detection points should be determined based on the characteristics of different indicators of power quality, and in accordance with relevant national standards and rules, combined with the actual situation of the power grid.