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| Portable load banks | High voltage load banks | Battery Testing | DC7000 load bank for diesel loco testing | Generator load banks |
Cressall manufactures load banks ranging from small portable loads for testing petrol generators to multi-megawatt high voltage loads for large diesel generators and gas turbines at up to 13.8kV. Regular load testing, along with correct battery maintenance, is the best way of ensuring the reliability of standby power systems.
Such tests are usually carried out against a temporary load bank brought to site for the purpose and removed afterwards, or a fixed dummy load installed with the generator.
Examples from Cressall’s range of load banks include the AC100, our largest ‘standard’ three-phase load bank, designed for on-site testing of three-phase generating sets of up to 100kW rating, and the DC600, seen here testing a the battery racks in a telephone exchange. The AC6 is popular with contractors and hire shops whose large fleets of generators need testing each time they are sent out or returned from hire.
Battery-backed uninterruptible power supplies (UPS) frequently form part of a standby power installation to provide power continuity while standby diesel generating sets are started. UPS batteries are a high-value asset and direct demonstration of their capacity in the form of a battery discharge test is a frequent requirement. Cressall offers a complete range of portable DC load banks for this purpose, with capacities of up to 480V DC and 600A.
Rail operators of large diesel-electric locomotives use 3MW load banks in their maintenance workshops for proving the power capability of the diesel engine — DC generator assemblies after they have been maintained or rebuilt. This requires a load such as the Cressall DC7000: this is our latest design for this application, operating at up to 2kV and 8000A with fully automatic load selection and recording of test results.
Most aircraft power supplies are 400Hz or 28V DC. Cressall manufactures load banks for proving such systems, including the DC800, which can simulate an aircraft engine start.
Cressall Resistors Ltd, Evington Valley Road, Leicester, LE5 5LZ U.K. Tel: (+44) (0)116 273 3633