Special test load box for UPSs (uninterruptable power supplies)

Abstract

The invention relates to the technical field of load test, in particular to a special test load box for UPSs (uninterruptable power supplies). The special test load box comprises three bridge rectifiers connected with R, S and T phases of a three-phase power supply respectively, wherein each bridge rectifier is connected with a power load part; each power load part comprises a resistive load part and a capacitive load part and is connected with lower computer PLC (programmable logic controller) through a contactor matrix, and the lower computer PLC is connected with a forced air cooling fan through a contactor. The special test load box for the UPSs further comprises an electrical parameter test module which is connected with the R, S and T phases of the three-phase power supply, and the electrical parameter test module and the lower computer PLC are connected with an upper computer test terminal through an RS485 communication interface. The special test load box can provide test for three UPSs independently simultaneously and can also provide test for three-phase UPSs, and provides a critical test link for ex-factory inspection.

Description

technical field [0001] The invention relates to the technical field of load testing, in particular to a special testing load box for UPS power supplies. Background technique [0002] As the test performance requirements of UPS power supply gradually increase, the requirements for UPS power supply test equipment also increase accordingly. However, the load test equipment for UPS power supply test is mixed, and many load boxes for UPS power supply test use pure resistance. . [0003] Yet the problem or shortcoming that prior art exists are as follows: [0004] 1. At present, many UPS power supply test equipment in the industry have a power factor of 1, which cannot meet the power factor test range of 0.6-1. [0005] 2. Part of the UPS power supply test is an AC test load, which cannot meet the RCD (resistance-capacitance-transistor) type non-linear test load stipulated in the national standard. [0006] 3. Some RCD loads are only controlled by a simple combination of resist...

AI Technical Summary

Problems solved by technology

[0004] 1. At present, many UPS power supply test equipment in the industry have a power factor of 1, which cannot meet the power factor test range of 0.6-1.

[0005] 2. Part of the UPS power supply test is an AC test load, which cannot meet the RCD (resistance-capacitance-transistor) type non-linear test load specified by the national standard

[0006] 3. Some RCD loads are only controlled by a simple combination of resistors and capacitors, without corresponding capacitor protection measures, resulting in a very low service life of the UPS test load

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