Generator AVR (voltage regulator) is a sealed electronic device that regulates the rectified output power of the exciter armature by controlling the low-power exciter magnetic field, so as to control the host magnetic field current and stabilize the output voltage requirements of the brushless generator, with low frequency and no input signal protection device. And with parallel compensation function, in line with customer demand for capacity expansion, therefore, it is very important to maintain a good AVR (voltage regulator).
AVR (automatic voltage regulator) damage mainly due to the following circumstances.
1, AVR circuit by rectifier main circuit, voltage detection circuit, comparative control circuit composed of three parts; exclude the possibility of damage caused by the quality of the original electrical components themselves, in the whole AVR circuit, the main circuit and comparative control circuit operating frequency change is the largest; where the main circuit of the rectifier bridge and comparative circuit transistor change more frequently, its damage ratio accounted for the whole AVR Damage rate of more than 90% of the whole AVR;
2, in view of the AVR on the imported generator is a non-disassembly parts, damage to be replaced by a new one, so we mainly analyze the causes of damage to the AVR on the diesel generator, as far as possible to avoid damage to the AVR is the most important, as long as the use of appropriate, can improve the service life of the AVR. The more stable the generator voltage, the smaller the frequency of change in the AVR; the smaller the switching action of the transistor in the comparison circuit, the smaller the chance of damage to the AVR;
3, the output load is relatively stable, the smaller the frequency of change in the AVR, the smaller the switching action of the transistor in the comparison circuit, the smaller the chance of damage to the AVR; the more stable the speed of the diesel engine, the smaller the oscillation impact of the changing current on the AVR; regular “wandering” and overload, the three-phase load is too large a difference is the main cause of AVR damage; choose with E, F, C fuel system Generator set with E, F, C fuel system, because the frequency change is small, the use of the generator AVR will be more reliable.