The main goal of this article is to give an introductory idea of download tests for non-technical readers. So, let's start from the basics and take a tour without going into too many technical terms. However, it is expected that the reader will have taken courses in their middle or high schools that make them familiar with some basic terminology of electrical sciences, or have gained a lot of knowledge through practical or professional experiences.
In clear words, a diesel generator load test is a sequential procedure that shows how a diesel generator performs when exposed to a low, medium, and high load ratio of its rated power. To test this, the DG Group is gradually undergoing multiple loads from a loading bank in a test facility, so that its response to the full range of its capacity can be studied.
For obvious reasons, the critical part of the response graph is the range of 50% to 90% of the rated capacity. Since most of the use will be in this range, we should focus a lot on this range and if the generator performance is good then one can reasonably sure that it will perform well in the lower ranges as well. You should remember the fact that for generators that have never been exposed to at least 30% of their rated capacity, it is recommended to perform a pregnancy test as a mandatory procedure that must be followed.
For starters, the load represents only electrical resistance in the form of drained equipment, cables and batteries that derive energy from a power source such as a diesel generator. In a modern pregnancy test facility, real situations are simulated by spreading variable loads that cover the entire range, but with a gradual transition and not sudden changes in a controlled pregnancy.
Various parameters such as transmission responses, engine torque, vibration, temperature, pressure, fuel use, amount of fuel remaining, time at which the generator successfully operates at the peak, and most importantly, that the delivered horsepower is recorded and monitored by different sensors .
The computer software automatically creates graphs between several standard variables and compares the response with the ideal response graph to determine the graphical deviation of the diesel generator used from the ideal variable. In this way, test engineers gauge the actual performance of the generator and work to reduce technical errors when performing maintenance before starting the diesel generator used for resale.
Often times, pregnancy test reports are presented to customers who buy used diesel generators, along with a certificate for that. The standard is to include the following vital points in the report: KW load, alternating voltage, hertz, oil pressure, voltage rate, voltage test, additional notes and comments.