Phase loss detection of three-phase power is an important power monitoring task aimed at timely detecting the absence of a phase in the three-phase power supply, in order to avoid equipment damage and ensure the normal operation of the power system.

Common methods for detecting three-phase power phase loss include:

1. Voltage detection method: By measuring the voltage value of each phase of three-phase electricity, if the voltage of one phase is significantly lower than the normal range, it can be judged as a phase loss.

2. Current detection method: Monitor the magnitude and balance of three-phase currents. When one phase current is zero or much lower than the other two phases, there may be a phase loss.

3. Phase detection method: Analyze the phase relationship of three-phase electricity. If the phase is abnormal, it may indicate a possible phase loss phenomenon.

In practical applications, specialized phase loss detection equipment or integrated phase loss detection functions are usually used in power control systems. These devices and functions can promptly issue alerts and notify relevant personnel for handling, in order to reduce losses and risks caused by phase loss.