Power quality monitoringIt evaluates power quality by monitoring the power system's power quality indicators, such as voltage, current, frequency, power, etc., and identifies and solves power quality issues. However, in practical applications, due to various factors,Power quality monitoring deviceOften subjected to various interferences, this not only reduces its monitoring effect, but also affects the quality of power supply, so it is necessary to eliminate the interference.

Common power quality disturbances can be divided into two categories: one is electromagnetic interference caused by external factors such as lightning, television, radio, etc.; the other is interference caused by internal factors such as changes in the system's own equipment, equipment failures, etc. The following will specifically introduce methods for eliminating interference.

1、 Elimination of external interference

1. Shielding off electromagnetic fields: The shell of the power quality monitoring device can use metal shielding or electromagnetic shielding technology to reduce electromagnetic interference.

2. Adding a choke: When the power quality monitoring device is connected to the power line, a choke is added in front of the power line to filter out electromagnetic interference on the power line.

3. Add a distribution board: Separate the power line, signal line, and ground wire to reduce mutual interference between various lines.

4. Stay away from interference sources: Power quality monitoring devices should be kept away from electronic devices such as televisions and computers to avoid interference from high-frequency signals.

2、 Elimination of internal interference

1. Optimize system parameters: By optimizing system parameters, minimize the interference caused by internal factors such as changes and faults in system equipment.

2. Choose the appropriate wiring method: When installing power quality monitoring devices, choose the appropriate wiring method to reduce interference caused by the wiring method.

3. Improve instrument resolution: Improve the resolution of power quality monitoring devices and reduce the impact of interference signals on measurement results.

4. Calibration instrument: Regularly calibrate the power quality monitoring device to ensure its accuracy and stability.

In summary, eliminating interference from power quality monitoring devices requires two aspects: eliminating external and internal interference, adopting appropriate methods to ensure the accuracy of the monitoring device, and improving monitoring effectiveness.