The main causes of damage of automatic voltage regulator (AVR)
AVR circuit is composed of rectifier main circuit, voltage detection
circuit and comparison and control circuit; excluding the possibility
that the damage is caused by the quality problems of the electric
components, the working frequency of the main circuit and comparison and
control circuit changes most among the whole AVR circuit. And the
rectifier bridge in the main circuit and the transistor in the
comparison circuit change even more frequently, and their damage
proportion accounts for more than 90% of the whole AVR damage rate. AVR
is non-dismantle components, and if it is damaged, it needs to be
replaced. Therefore, we mainly analyze the reason that causes the damage
of AVR in the generator and to avoid AVR damage as much as possible is
the most important.
The service life of AVR can be increased if it is used properly.
(1)If the voltage of the engine is more stable, the change in AVR is
less frequent; if the switch motion of transistor in comparison circuit
is gentler, the AVR damage probability rate is less;
(2) If the output load is relatively stable, the change in AVR is less
frequent, and if the switch motion of transistor in comparison circuit
is gentler, the AVR damage probability rate is less;
(3)If the rotational speed of the engine is more stable, the oscillatory surge that currency variance causes to AVR is less;
(4)Frequent “idle running”, overload running and great difference of load are the main causes of AVR damage.