Load tests

It is not always possible to load the unit at full power during the monthly test runs. The unit is often operated at partial power – the load may be even less than 50% of the nominal power. A low load level considerably increases carbonisation. When test runs are performed at low load levels, undercapacity of the cooling system, for example, may go undetected.

Load tests at least once per year

It is recommended that the emergency power unit be loaded at the nominal power at least once per year. Loading with the nominal power without a test load is often possible only if power supply from the emergency power unit to the grid is allowed. We use a load resistor, or loadbank, in our tests. The programme prepared in advance varies the unit load between 0 and 110%. We also conduct a performance test in connection with the load test to inspect the operating condition of the control devices of the emergency power unit. A report including graphs is compiled on all load tests.

Testing of UPS equipment

The purpose of the UPS equipment is to secure the load for a set period of time. The criticality of the load and the probability of a power outage are the basis for defining the battery capacity that determines the duration of UPS-supplied power.  Depending on how critical the load is, the accuracy of the battery capacity is verified in the receipt inspection, at the latest. The load resistors of our equipment ensure a steady and continuous resistive load for testing the battery power. The power of the load resistor can be adjusted at 1 kW intervals. The testing capacity of our equipment covers megawatts.  The rubber cables needed to perform the tests are available for rent directly from our warehouse, and, if needed, we conduct the tests as a turnkey service which includes a written report.

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