The main purpose of testing UPS is to identify whether the actual technical indicators of UPS can meet the usage requirements. UPS testing generally includes two types: dynamic testing and steady-state testing. Steady state testing is conducted under no-load, 50% rated load, and 100% rated load conditions to test the phase voltage, line voltage, no-load loss, power factor, efficiency, output voltage waveform, distortion, and frequency of the input and output terminals. Dynamic testing generally tests the changes in the output voltage waveform of APC UPS during sudden load changes (usually selecting loads from 0% to 100% and from 100% to 0%) to verify the dynamic characteristics and energy feedback path of Emerson UPS.
APC UPS power supply is a new type of power supply that we use in our work. At the beginning of use, we may not have a better grasp of the skills involved. We simply follow the requirements and do not know how to maximize its efficiency. These are some additional knowledge that we need to know after we have a good understanding of it. Below, we will introduce them in detail.
In depth analysis of UPS uninterruptible power supply testing techniques
The testing of APC UPS power supply is usually divided into dynamic testing and steady-state testing. Dynamic testing is generally used to test the changes in the output voltage waveform of APC UPS during sudden load changes, in order to verify the dynamic characteristics and energy feedback path of the UPS. Steady state testing is conducted under no-load, 50% rated load, and 100% rated load conditions to test the phase voltage, line voltage, no-load loss, power factor, efficiency, output voltage waveform, distortion, and frequency of the input and output terminals. Below, Huayite will take you to analyze four UPS power testing techniques in depth:
1. Observe the waveform, select no-load and full load conditions, observe whether the voltage waveform is normal, and measure the distortion of the output voltage waveform. The total harmonic of the output voltage measured by a distortion meter is generally less than 5%.
2. APC UPS output voltage
When the input DC voltage of the APC UPS power inverter changes by plus or minus 15% and the output load changes by 0-100%, its output voltage value should be maintained within the range of plus or minus 3% of the rated voltage value. This indicator appears to be repetitive with the previously mentioned indicators, but in reality it requires higher standards than the previous indicators;When the input voltage is 90% of the rated voltage, and the output load is 100% or the input voltage is 110% of the rated voltage, and the output load is 0, the output voltage should be maintained within the range of plus or minus 3% of the rated value.
When the input voltage is 90% or 110% of the rated voltage, and one phase of the output voltage is unloaded and the other two phases are 100% loaded, the output voltage should be maintained within a range of plus or minus 3% of the rated value, and the phase difference should be maintained within a range of 4 degrees.
The efficiency of APC UPS is relatively high for most APC UPS only when the load is between 50% and 100%. When the load is below 50%, the efficiency drops sharply. The efficiency indicators provided by manufacturers are mostly under rated DC voltage and rated load conditions. It is best for users to choose the relationship curve between efficiency and output power, as well as the efficiency when the DC voltage changes by plus or minus 15%.