Over voltage, over current, under voltage, short circuit, etc.These 4 are explained in detail under the chant, no points, well intentioned people to help the next busy bar!
Therefore, the use of electrical equipment, household appliances, must have more than three insurance, and over-current, over-voltage, undervoltage, short-circuit protection measures to protect electricity equipment and personal safety.
The current and voltage exceeds the rated value is over-current and over-voltage, then by the protection circuit and the device executes power protection, undervoltage refers to the voltage is lower than the electric equipment ratings, this will make the equipment does not work properly, even can not work, the loss increases, the damage of equipment. Short circuit refers to the damage of the insulation of the electrical equipment, or the formation of circuits directly between the lines, phases and phases, resulting in a dramatic increase in the instantaneous current and the burning of power facilities.
All electrical equipment are marked with the rated voltage and rated current of these devices, devices, coils, usually by electricity conversion function equipment can withstand the safety value exceeds the safety value, the equipment will be damaged, causing accidents, so the electric equipment are equipped with protective measures, such as air, switch on the device thermal protection.
