Four performance parameters of UPS power quality

The technical parameters of UPS power supply are important indicators of the quality of UPS and are the main basis for selection. For the UPS power supply to be able to supply the load device with clean and uninterrupted power supply, it is necessary to have a detailed understanding of its performance parameters.

The main technical parameters are as follows:

1.input parameters

Input voltage range, according to the situation of China's power grid is not high, should choose a wider range of UPS, the current UPS range designed with Silicon Controlled Rectifier(SCR)  is -15%, +10%, if this value will increase the UPS failure rate The UPS shall have an automatic protection function for three-phase input phase sequence error and three-phase phase loss input.

2.the output parameters

The static stability of the output voltage is ±1% for medium and large UPS; the transient voltage fluctuation value of output voltage is less than ±5% for medium and large UPS; the adjustable range of output voltage.

3.Rated operating parameters

Rated output power; rated maximum output, input current; rated output input frequency, China is standard 50 Hz; nominal input and output voltage, according to the way of incoming and outgoing lines.

4.other parameters

The average time between failures is 20 to 400,000 hours (large UPS power supply), 15 to 220,000 hours (medium UPS power supply); parallel capacity, UPS uninterruptible power supply is required to have direct parallel output capability, and each UPS output current is The flow imbalance is 2% to 5%, and the value should be as small as possible; it should have remote monitoring, fault alarm, and operation status recording function; it should have lightning protection against surge suppression and anti-static discharge function.