Phase failure is one of the main causes of combustion of three-phase motors. Working on two phases, the engine overheats and fails within minutes. Let's look at how to organize protection against single-phase mode.
What is the danger of single-phase mode
When one phase disappears, the current in the remaining ones increases sharply. The winding overheats, the insulation is destroyed, and the motor burns out. Conventional thermal protection does not always have time to react.
Protection devices
| Device | What it does |
|---|---|
| Phase control relay | Turns off when there is a phase break or imbalance |
| Thermal relay with protection from break | Responds to current imbalance |
| Voltage relay | Control of sags and imbalances |
The most reliable option for critical equipment is a phase control relay, which turns off the motor instantly when a phase disappears.
Where it is especially important
- Pumping stations and water utilities.
- Agricultural equipment with an unstable network.
- Equipment that operates without constant supervision.
Installing protection is inexpensive, and saves you from rewind of a burnt-out engine. If the motor has already suffered from a phase loss, repair will be required. diagnostics will help determine the cause.
Do you want to protect motors from phase failure in Tashkent? Elektromotors engineers will select and install protection - contact us.