WALT POWER delivered a 500kW resistive load bank to Thailand. The unit, model WGP-LB-500kW, was configured for 400V, 50Hz, three-phase operation, with a power factor of 1.0.
This 500kW load bank is designed to apply controlled electrical loads during generator testing. It supports both local operation and Windows PC-based monitoring and control, allowing operators to perform load tests and record test data.
500kW Resistive Load Bank Specifications
The load bank delivered to Thailand had the following specifications:
| Item | Specification |
|---|---|
| Model | WGP-LB-500kW |
| Maximum Load Capacity | 500kW |
| Rated Voltage | 400V |
| Frequency | 50Hz |
| Phase | Three Phase |
| Power Factor | 1.0 (Resistive) |
| Control System | Local Control / Windows PC |
| Load Steps | 10kW + 20kW + 20kW + 50kW + 100kW + 100kW + 200kW |
| Specified Operating Temperature | -10°C to +50°C |
| Warranty | 12 Months |
Load Steps and Generator Testing
One important feature of this 500kW resistive load bank is its seven load steps.
The individual steps are 10kW, 20kW, 20kW, 50kW, 100kW, 100kW, and 200kW, providing a combined maximum capacity of 500kW.
By selecting different combinations of load steps, operators can apply different levels of electrical load during a generator test.
For example, the load bank can be used to check generator performance under increasing load, observe voltage and frequency behavior, and verify operation at the required test points.
A resistive load bank applies an active power load at a power factor of 1.0. It does not independently simulate the reactive power demand of inductive equipment.
This distinction matters when selecting a load bank for generator testing. A 500kW resistive load bank is not the same as a 500kVA load bank rated at a power factor of 0.8.
For reference, a 625kVA generator rated at 0.8 power factor has a nominal active power rating of 500kW. However, the actual test arrangement must also account for the generator's rated voltage, frequency, available capacity, and the test objectives.
Local Control and Windows PC Monitoring
The load bank supplied for this project supports both local control and operation through a Windows PC.
With the PC-based control system, operators can monitor the load test, save test data, and print records for later review.
These functions are useful during generator commissioning, maintenance testing, and performance verification, particularly when test records need to be retained.
For diesel generators that operate for extended periods at low load, a properly planned resistive load test can also help bring the engine into a more suitable operating load range. This may help address operating conditions associated with wet stacking, although the appropriate load level and test duration must follow the engine manufacturer's recommendations.
Selecting a Resistive Load Bank for Your Project
When reviewing a load bank specification, I recommend looking beyond the maximum kW rating.
The load bank voltage, frequency, load-step configuration, control method, and intended test procedure should all match the equipment being tested.
At WALT POWER, we supply resistive load banks in different capacities for generator testing and other electrical load applications.
For more information, see our resistive load bank range
If you are sourcing a load bank for a project, please provide the required capacity, voltage, frequency, and control requirements so we can review a suitable configuration.
