Why should the generator set be tested by the load group?

The load group test uses a special device (load group) to generate artificial load on the generator by making the engine reach the correct operating temperature and pressure.

We need to consider the expected function of the diesel generator.When the main power supply fails, the diesel generator needs to be able to start immediately in order to prevent potential catastrophic function and data loss in the business.Because diesel generators may be rarely used in nature, it is necessary to ensure that the generators can start without failure even if they are dormant for a long time.

This is especially important if the generator may need to carry heavy loads frequently.According to experience, if the generator does not bear more than 30% of its rated kW load, a load group test should be carried out.

Load group testing is necessary to prevent problems that may lead to slow or loss of generator function.The most common of these is wet stacking.This happens when diesel generators operate infrequently or only bear light loads.Over time, deposits of soot and unburned fuel begin to accumulate in the exhaust system, resulting in wet accumulation.This will lead to abnormal operation of the diesel generator, and even damage the internal work of the generator.Load group tests can burn off these fuel and soot deposits and reduce the risk of wet accumulation.

In order to be most effective, load group tests should be conducted once a year.When it is implemented on a regular basis, generator owners can enjoy the following benefits:

1. The function of diesel generator can be verified without routine start-up.

2. Problems that may affect performance can be identified earlier so as to prevent productivity loss and significantly save maintenance costs.

3. There is no carbon (soot) deposit in the generator, and the risk of wet accumulation is reduced.

4. The engine cooling system will run well undr the required load.

5. Provide more reliable performance metrics than simply starting it. Just because the generator can start normally doesn't mean it can handle the load.

6. Generators will support them when they are really needed.

7. The load group test is designed to make generator users feel at ease and therefore check all factors that are critical to efficient and reliable operation and the life of diesel generators.

The factors to check include：

• Oil pressure.

• Hertz.

• Kilowatt load.

• Ac voltage.

• Rated current.

• Voltage test

So now that we've discussed the importance and benefits of load group testing and what to check in the process, let's take a look at how it works.No matter what electrical equipment supplies power to the load group, it should be provided with appropriately rated cables.These enable it to be placed up to 20 meters from the diesel generator terminal or distribution unit (PDU).

The load group uses heavy heating elements and fans for cooling, so heat dissipation and noise reduction should be taken into account when testing.Make sure the tests are in place, without sensitive alarms, sprinkler systems and, of course, nearby staff.

Measurements are made during discharge to determine battery life and overall system performance.The load group test will also identify any problems with generators and uninterruptible power supplies in real time and indicate the measures to be taken to solve the problems.