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info@upspowersupply.netDynamic and Static Test Methods for UPS
The UPS power test includes the static test and the dynamic test. The
static test is conducted under the empty load, 50% of the rated load and
100% of the rated load to test the different phase voltage, wire
voltage, empty load consumption, power factor, efficiency, output
voltage waveform, distortion and output voltage frequency of the input
and output terminal. The dynamic test is to test changes of the UPS
output voltage waveform under sudden changes of the load to test the
UPS’s dynamic characteristics and energy-feedback channel.
Waveform
Observe whether the waveform is normal under the empty load or full load. Check the distortion meter to measure the distortion of the output voltage waveform. Under the normal working conditions, the resistance load is connected, and the distortion meter is used to measure the distortion of the output voltage waveform. Under normal working conditions, the resistive load is adopted and the distortion meter is used to measure the relative content of the output voltage’s total harmonic, which should meet requirements of product specification, that is, to be smaller than 5%.
Steady test
As to the steady test, it is conducted when the system is normal, which is generally used to test the waveform, frequency and voltage. The frequency is usually measured with the oscilloscope to observe the output voltage frequency and with the power supply disturbance analyzer to measure the voltage frequency. Currently, the output voltage frequency of the UPS can generally meet the requirements. When the oscillator’s precision is inadequate or when the electric power frequency is unstable, the UPS output voltage frequency might change accordingly. The output frequency precision of the UPS is usually synchronous with the electric power, which can reach ±0.2%.
Efficiency
The UPS efficiency can be obtained via the UPS output power and input power. The UPS power is mainly decided by the inverter’s design. A majority of UPS power systems demonstrate a high efficiency under 50% to 100% of the load. When the load is lower than 50%, its efficiency will drop dramatically. The efficiency index provided by the manufacturer is based on the rated DC voltage and rated load. Users should choose the efficiency constituting a relationship curve with the output power and the DC voltage change is ±15%.
Output voltage
The output voltage of the UPS can be tested by the following methods:
1. When the input voltage is just 90% of the rated voltage, the output load is 100% or the input voltage is 110% of the rated voltage, and the output load is 0, its output voltage should be maintained within ±3% of the rated value.
2. When the input voltage is 90% or 110% of the rated voltage, one phase of the output voltage is in an empty load, and the other two phases are under 100% load, its output voltage should be maintained ±3% of the rated volume, and the phase difference should be controlled within 4°.
3. When the input DC voltage changes of the UPS power is ±15%, and the output load is 0~100%, the output voltage should be maintained within ±3% of the rated voltage. The index appears to have been overlapped with the above indexes, but is actually higher the indexes mentioned above. This is because when the input signals of the control system change within a large scope. There will be obvious nonlinear characteristics. To prevent the output voltage from exceeding the permissible scope, there is a higher circuit requirement.
Waveform
Observe whether the waveform is normal under the empty load or full load. Check the distortion meter to measure the distortion of the output voltage waveform. Under the normal working conditions, the resistance load is connected, and the distortion meter is used to measure the distortion of the output voltage waveform. Under normal working conditions, the resistive load is adopted and the distortion meter is used to measure the relative content of the output voltage’s total harmonic, which should meet requirements of product specification, that is, to be smaller than 5%.
Steady test
As to the steady test, it is conducted when the system is normal, which is generally used to test the waveform, frequency and voltage. The frequency is usually measured with the oscilloscope to observe the output voltage frequency and with the power supply disturbance analyzer to measure the voltage frequency. Currently, the output voltage frequency of the UPS can generally meet the requirements. When the oscillator’s precision is inadequate or when the electric power frequency is unstable, the UPS output voltage frequency might change accordingly. The output frequency precision of the UPS is usually synchronous with the electric power, which can reach ±0.2%.
Efficiency
The UPS efficiency can be obtained via the UPS output power and input power. The UPS power is mainly decided by the inverter’s design. A majority of UPS power systems demonstrate a high efficiency under 50% to 100% of the load. When the load is lower than 50%, its efficiency will drop dramatically. The efficiency index provided by the manufacturer is based on the rated DC voltage and rated load. Users should choose the efficiency constituting a relationship curve with the output power and the DC voltage change is ±15%.
Output voltage
The output voltage of the UPS can be tested by the following methods:
1. When the input voltage is just 90% of the rated voltage, the output load is 100% or the input voltage is 110% of the rated voltage, and the output load is 0, its output voltage should be maintained within ±3% of the rated value.
2. When the input voltage is 90% or 110% of the rated voltage, one phase of the output voltage is in an empty load, and the other two phases are under 100% load, its output voltage should be maintained ±3% of the rated volume, and the phase difference should be controlled within 4°.
3. When the input DC voltage changes of the UPS power is ±15%, and the output load is 0~100%, the output voltage should be maintained within ±3% of the rated voltage. The index appears to have been overlapped with the above indexes, but is actually higher the indexes mentioned above. This is because when the input signals of the control system change within a large scope. There will be obvious nonlinear characteristics. To prevent the output voltage from exceeding the permissible scope, there is a higher circuit requirement.
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