Detail Motor Protection Relay SEPAM 1000+ M Series
Motors are the interface between electrical and mechanical equipment. They are connected to the machines they drive
and are therefore exposed to the same environment.
Motors may be subjected to internal mechanical stress due to their moving parts.
A single faulty motor can disrupt an entire production process. Modern motors have optimized characteristics which make them unsuitable for operation other than according to their rated characteristics. This means that they are relatively fragile electrical loads that need to be carefully protected.
There are asynchronous motors ( mainly squirrel-cage motors or wound-rotor motors) and synchronous motors ( motors with DC rotor excitation) .
Questions concerning synchronous motors are the same as those that concern asynchronous motors plus those that concern generators.