The rotating rectifier of the generator is usually a silicon rectifier circuit. If one or several rotating silicon components in the circuit are damaged, the damaged silicon components will lose unidirectional conductivity (conducting in both forward and reverse directions), causing the circuit to be in a short-circuit state. Once the rotating silicon element is short-circuited, the generator has no output voltage when the unit is running. If the fault is not found and eliminated in time, the armature winding of the AC exciter will be burned, and the generator will be forced to stop.
1. Cause of failure:
(1) The silicon rectifier diode of the rotary rectifier is damaged due to overvoltage or overcurrent.
(2) When the silicon rectifier element of the rotary rectifier is installed, the torque is too large, resulting in deformation of the tube shell and damage to the internal silicon chip.
(3) The load power factor is too low, so that the excitation current exceeds the rated current of the silicon rectifier element for a long time and damages it.
2. Processing method:
(1) Rotary silicon components should be used according to the current level specified in the drawings. If there is no drawing data at hand, you can rely on the standard specification silicon components according to the excitation current value of the main generator. At present, the common specifications of domestically produced rotating rectifiers are 16A, 25A, 40A, 70A and 200A.
(2) Reasonably rotate the voltage level of the silicon element. The reverse peak voltage of the rotating silicon element should be 10 to 15 times the excitation voltage.
(3) Tighten the nut of the rotating silicon element, the torque should be appropriate, and use a constant torque wrench to tighten the nut. The torque values for tightening the rotating silicon element nut are specified in the table below.
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