Some common reasons are :
1). Load applied to generator exceeds capacity, typically would cause machine to slow down, drop frequency and voltage typically cause exhaust black stacking and depending on the overload and protection settings could cause machine to stall.
2). AVR Voltage gain set too low to respond to load being applied.
3). If AVR feedback is from generator bus VT and voltage dips too far, all excitation could be lost and would typically result in an undervoltage and overcurrent trip.
4). Speed control gain set too low to respond to load being applied.
5). Mechanical issue such as failing turbo unable to provide enough air of high enough pressure while taking on load which will cause machine to slow down and in some cases stall on high load application with sufficient reduction in speed voltage will also lower as well as frequency. In this condition you'd probably also see exhaust black stacking.
6). Mechanical issue such as fuel injection clogged or fuel filters clogged causing the machine to be under fuelled to handle load application and may cause machine to slow down, which in turn would drop Hertz and Volts.
7). There's a whole truck load full of other reasons why this could happen.
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Comments
Ashok
zekariyas
Evone
Stephen
I have this Sdom's Generator 440 kva that the stator winding breasted, after rewinding the voltage cant go up to 415v ,voltage now is 339v and the main rotor winding also heat. I need your help.
vijay
Guest
Low power single phase alternators often have simple excitation systems that use the output of the alternator to provide the field current, and are incapable of supplying high inrush current loads.
Small generators like this draw their excitation power from the output of the generator, have no AVR, nor any Boost capability; i.e., their voltage falls as the load increases. The size and type of load makes a huge difference in the generator's ability to maintain the voltage in an acceptable range when equipped with a simple excitation system that operates open loop.
Where did the excitation power come from, the generator terminals, or a dedicated extra winding in the stator? If it comes from the output terminals, then the "voltage regulator" is usually a LM part number whose job it is to limit the voltage to the field under no/light load, but it can do nothing to support the terminal voltage as it falls due to large inductive loads being applied.
A separately derived excitation source will indeed attempt to raise the excitation level to the current limits of the field/stator winding, but such sophistication is usually not found in consumer level single phase generators due to the cost factor.
Guest
Chandrshikar
I have a three phase connection for my duplex house and hence the ACCL was badly burnt due to sudden surge from Electricity pole. Hence as the cost of the ACCL was high I replaced with a manual Changeover switch. But the output is not controlled and as it is direct from the generator, due to fluctuations in the Generator output My appliances are blowing out one by one due to uneven voltage. Five LED tubelights, microwave was burnt though not switched on, and many other appliances are burning out. Hence I have now disconnected the Generator supply to my house.
Any suggestions how to control Generator output fluctuations as it is directly from generator to my house.
My email Id is cbagare@gmail.com
Please provide cost effective solution.
Thanks in advance.