SR 4 GENERATORSYSTEMS OPERATIONRADIO FREQUENCY INTERFERENCE (RFI)SUPPRESSIONWhen controlled rectifier (CR9) "turns on", it is veryrapid (approximately three microseconds). This causesa shock load on the stator (L6). AC voltage shocks tillcause harmonics (frequency multiplications) at radiofrequencies. For many applications, these harmonicswill cause electronic equipment to operate very badly.The action of suppression capacitor (C2) and SCRreactor (L2) gives a reduction of the shock load on stator(L6). As said earlier, suppression capacitor (C2) gets acharge during the time (T0) is positive and (T8) isnegative and controlled rectifier (CR9) is not "turned on".When a gate signal is sent to controlled rectifier (CR9)the first surge of current is caused by the voltage chargeon (C2). The current increase time is made longer bySCR reactor (L2). Suppression reactor (L1) and RFIsuppression capacitors (C1) and (C3) cause a reductionof interference with radio frequencies. Damping Resistor(R5) is connected in parallel with suppression reactor(L1) to prevent any voltage oscillations that start in (L1).RFI suppression capacitor (C1) is connected fromneutral to (T8) on phase 2 of stator (L6). Suppressioncapacitor (C3) is connected from neutral to generatorframe ground. To get the maximum effect from the RFIsuppression capacitors, the generator frame must beconnected to an earth or building (station) ground.GENERATOR REGULATOR ASSEMBLYC1,3 RFI Suppression capacitorsC2 Suppression capacitorCR9 Controlled rectifierL1 Suppression reactorL2 SCR ReactorR5 Damping resistor40
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