Before a diesel generator set is delivered, its operating condition and electrical performance need to be checked to ensure that the completed unit meets the specified requirements.

At GENLITEC POWER, generator sets are inspected and tested before delivery. The specific test items and conditions may vary according to the generator model, configuration, customer requirements, and applicable standards.

Why Generator Testing Matters

Factory testing provides an opportunity to verify the generator set before shipment rather than waiting until the equipment reaches the installation site.

The pre-delivery process can help verify:

○ Starting and operating performance

○ Voltage and frequency stability

○ Performance under different load conditions

○ Controller, alarm, and protection functions

○ Overall condition of the completed generator set

Visual and General Inspection

Before performance testing, the completed generator set is checked to confirm that the major components and connections are in proper condition.

Typical inspection items include:

○ Generator set appearance and assembly

○ Electrical connections and wiring

○ Control panel and instruments

○ Engine and alternator installation

○ Fuel, coolant, and lubrication systems

○ Signs of leakage, loose connections, or abnormal conditions

Engine and Generator Set Start-Up Test

The generator set is started and operated to verify that the engine, alternator, controller, and associated systems work together normally.

During operation, technicians can observe:

○ Starting performance

○ Engine operating condition

○ Abnormal noise or vibration

○ Operating temperature and lubrication pressure

○ Controller indications and operating parameters

Voltage and Frequency Test

Voltage and frequency are monitored during generator operation to verify that the electrical output remains within the specified operating range.

For three-phase generator sets, the test may include checking the rated voltage, frequency, current, and output power at different operating points.

The results are recorded as part of the generator's test documentation.

Load Performance Test

A load test places the generator under controlled electrical loads so its output can be evaluated under operating conditions.

Depending on the generator and test requirements, load testing may include:

○ No-load operation

○ Partial-load operation

○ Rated-load operation

○ Overload testing when specified

During the test, parameters such as voltage, frequency, current, and active power can be recorded at each load level.

This provides a practical check of generator performance rather than relying only on theoretical specifications.

Protection and Alarm Tests

Generator protection functions are also checked according to the controller configuration and generator requirements.

Typical functions may include:

○ Overspeed protection

○ High and low voltage protection

○ High coolant temperature protection

○ Low lubricating oil pressure protection

○ Emergency stop function

○ Controller alarms and shutdown functions

Final Inspection Before Shipment

After testing is completed, the generator set is checked again before shipment. The final inspection confirms the overall condition of the unit and the completion of the required testing and documentation.

The final review may include:

○ Generator set condition

○ Control panel and electrical connections

○ Accessories and required components

○ Test records and technical documentation

○ Preparation for shipment

Example: GENLITEC Pre-Delivery Load Test Report

The following is an example of a GENLITEC POWER pre-delivery load test report. It is provided to illustrate how test results can be documented for an individual generator set. Test items and conditions may vary according to the generator model, configuration, customer requirements, and applicable standards.

Generator Set: GPC350S5

Prime Rating: 350 kVA / 280 kW

Voltage: 415 V

Frequency: 50 Hz

Phase: Three-phase

In this example, the generator was tested through a sequence of increasing and decreasing load levels, from no load to 110% load and back to no load. At 100% load, the unit delivered 279.8 kW at 415.6 V and 50.03 Hz, closely corresponding to its 280 kW prime rating.

The report also records the 110% load test, where the generator reached 299.4 kW, 520.67 A, 415.0 V, and 50.06 Hz.

Function and alarm tests recorded in this example were all marked OK, including:

○ Hertz and voltage control

○ Coolant temperature

○ Lubricating oil pressure

○ Overspeed protection

○ Emergency stop

○ High and low voltage protection

Test Documentation and Traceability

A generator test report should identify the equipment being tested and record the relevant test information. This provides a clear reference for the completed generator set.

○ Genset model and serial number

○ Engine model and serial number

○ Alternator model and serial number

○ Controller model

○ Test measurements and results

○ Test engineer and test date

Conclusion

Pre-delivery testing is an important part of GENLITEC POWER's generator manufacturing and quality control process. It allows the completed generator set to be checked under operating conditions before shipment.

From general inspection and start-up to electrical performance, load testing, protection functions, and final documentation, the testing process helps verify that the generator is ready for delivery according to its specified requirements.

Contact GENLITEC POWER for reliable diesel generator sets and professional power solutions.