Case History # 16 

SIC 3621 - Electrical Generation/Portable Load Testing

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Problem:

A load bank tester for mobile generators is used to test the electrical output by creating different resistant loads and reading the generator output at different voltage settings. Traditional tester designs had their shortcomings, resulting in failure to withstand application conditions.

Solution:

To overcome the shortcomings of traditional designs, a new tester was developed with the following objectives:

• Replace open coil type heaters
• Lower cost
• Enable quick change of each heater
• Tighten tolerance on wattage, ±2-1/2 percent
• Stabilize at voltage and wattage in five minutes or less

The Watlow tubular element offered performance characteristics not possible with open resistance coil designs. Their comparisons included:

Features	Open Coil	Tubular
3-G Shock Test	Failed	Passed
Cost	Inexpensive	Competitive
Easy Change Out	Failed	Passed
Tight Tolerance On Wattage	Passed	Passed
Stabilize At Voltage and Wattage	Passed	Passed

Value Added:

Watlow provided a custom thermal solution and application expertise.
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