An alternator of a generating set can be protected in five different ways:
  1. THERMAL PROTECTION
    The TP protects the alternator against overload
  2. THERMAL-MAGNETIC PROTECTION
    The TMP protects the alternator against overload and short circuit.
    In case of overload the TMP shall switch off after a determined period of time. This period of time depends on the kind of overload: the higher the overload, the shorter the time needed by the TMP to switch off. In case of short circuit, the TMP should switch off immediately.
  3. EARTH LEAKAGE PROTECTION
    The ELP automatically interrupts the circuit when an earth leakage failure occurs between (a) phase(s) and the earth which exceeds 30, respectively 100 or 300mA, depending on the type of earth leakage switch used.
    The ELP protects persons against electric shocks in case of indirect contact. Moreover, the ELP also serves as a protection against short circuit. An earth pin is required in most cases !
  4. INSULATION PROTECTION
    An insulation protection relay is used to measure and guard the insulation (resistance) between a not earthed AC- mains and a free chosen earth (= the frame or the mass of the generating set). In this way the user is protected against undesired contact with the AC- mains.
    When an insulation default occurs the tension of the alternator can be interrupted, the engine can be stopped or an alarm can be activated. An earth pin is not required here!
  5. TEMPERATURE PROTECTION
    A temparature switch on the windings of the alternator will open and cut the power to the sockets in case that the winding temparature becomes to high.
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