Steady State and Dynamic Test Methods of UPS Power Supply

UPS power supply test generally includes steady-state test and dynamic test. Steady state test is to test each phase voltage, line voltage, no-load loss, power factor, efficiency, output voltage waveform, distortion and frequency of output voltage at input and output terminals under no-load, 50% rated load and 100% rated load conditions. Dynamic test is generally to test the change of UPS output voltage waveform when the load changes suddenly (generally select the load from 0-100% and from 100% - 0), so as to test the dynamic characteristics and energy feedback path of ups.

1 waveform

Generally, under no-load and full load conditions, observe whether the waveform is normal, and measure the distortion of the output voltage waveform with a distortion meter. Under normal working conditions, connect resistance load and measure the relative content of total harmonic of output voltage with distortion meter, which shall meet the requirements of product regulations, generally less than 5%.

2 steady state test

The so-called steady-state test refers to the test when the equipment enters the "system normal" state. Generally, the waveform, frequency and voltage can be measured. Generally, the frequency can be observed by oscilloscope and measured by "power disturbance analyzer". At present, the output voltage and frequency of UPS can generally meet the requirements. However, when the frequency circuit of UPS power supply and local oscillator are not accurate enough, it is also possible that the frequency of UPS output voltage will change when the mains frequency is unstable. The accuracy of UPS output frequency can generally reach plus or minus 0.2% when synchronized with the mains power.

3 efficiency

The efficiency of UPS can be obtained by measuring the output power and input power of ups. The efficiency of UPS mainly depends on the design of inverter. Most ups have relatively high efficiency only when the load is 50% - 100%. When the load is lower than 50%, its efficiency will drop sharply. The efficiency indicators provided by manufacturers are mostly the efficiency under the rated DC voltage and rated load. It is best for users to select the relationship curve between efficiency and output power and the efficiency when the DC voltage changes by plus or minus 15%.

4 output voltage

The output voltage of UPS can be tested and judged by the following methods:

A. 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 shall be kept within the range of plus or minus 3% of the rated value.

B. When the input voltage is 90% or 110% of the rated voltage, one phase of the output voltage is no-load, and the other two phases are 100% load, the output voltage shall be kept within the range of plus or minus 3% of the rated value, and the phase difference shall be kept within 4 degrees.

C. When the input DC voltage of UPS inverter changes by plus or minus 15% and the output load changes by 0-100%, its output voltage value shall be kept within plus or minus 3% of the rated voltage value. On the surface, this indicator repeats the previous indicators, but in fact, it is more demanding than the previous indicators. This is because when the input signal of the control system changes in a large range, it shows obvious nonlinear characteristics. In order to make the output voltage not exceed the allowable range, the circuit requirements are higher.

Steady State and Dynamic Test Methods of UPS Power Supply 1

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