Generator Hunting and Surging

Generator hunting and surging randomly or erratically.

This can occur when the generator is under load and has been running perfectly normally then suddenly your generator struggles.

You’ll first become aware of this , because you’ll hear the engine struggling or hunting randomly.

Check the control panel for frequency.

You may find that on the control panel you can see the frequency drop and rise erratically whilst you’re watching.

There many causes but here are the most obvious with how to fix the issues:

Fuel blockage or restriction – Check Filters and Fuel quality

Fuel pump – intermittent fault – Check for leaks or lack of fuel

Machinery loads have suddenly started up and caused a wild spike load beyond the range of your generator- Your Generator is struggling to cope

Motor drives down stream are going ON & OFF erratically causing generator overload

The load on the generator isn’t balanced and has increased recently then dropped and back again etc.etc. by operatives without your knowledge. Check site foreman

Old Motor drives without electronic governor starting up hitting the generator with a large power spike beyond the power range of the generator

Severely imbalanced load across phases, load increases and drops rapidly-
For example
Phase 1 Zero
Phase 2 100%
Phase 3 10%
Check the load balancing and ensure all the loads are equally balanced across the 3 phases and you’re not OVERLOADING the generator either continuously or spike loads of short duration

NO functioning AVR on the generator – Basic Alternator/Governor
Check and if one hasn’t been fitted then do so retrospectively.

AVR failure or intermittent AVR failure
The AVR is a small device that sits on the alternator monitoring the power output. You may never even notice it.
The Automatic Voltage Regulator (AVR) is there to maintain constant voltage and power line conditioning to the equipment load under a wide variety of conditions, especially when the load on the generator could vary widely. The AVR smooth’s out the constant power output of the generator.

Contact your generator supplier who can send out an engineer with a laptop to log into your control panel. Once inside the software , he can determine whether this is the AVR fault or not, fuel issue or it’s your site load is the issue. Whatever you do NOT operator the generator whilst it is struggling

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Power Continuity can assist – Call us on 0845 055 8455

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