Main types of protection -Limitation of the maximum output voltage at the level of 220-230 V -Protection from short circuit under load -Protection from core-to-core fault and earth fault -Feeding cable breakdown alarm -Alarm of surface-leakage current excess in the electromagnet circuit (in case of electromagnet overheating) -Alarm of occurrence of interturn short circuits in the electromagnet -Alarm of excess of the maximum permissible current