Load testing of uninterrupted power supply systems using regenerative loading by supplying percentage of a test power

摘要

To ensure high level of reliability, it is desirable to test an electrical device, such as an uninterruptible power supply (UPS) system, periodically with minimum possible energy usage and without compromising reliability. A regenerative load (RGL) unit is described which makes it possible to conduct a load test of a UPS system and supply a portion of the energy used for the load test from a generator in the RGL unit. An induction motor driven by an adjustable speed drive and coupled to an induction generator is used in the RGL unit to supply the load to the electrical device and supply a portion of the power used by the electrical device under test.