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Understanding UPS UPS

Time:2018-06-28        Read

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Due to the aging of the UPS system in a substation , a phase-to-phase short circuit occurred. The fault current caused a fire in the UPS power screen, further caused AC string DC, and the breakdown of the varistor in the measurement and control device led to multi-point grounding of the DC system, eventually leading to power loss in the background monitoring system and remote communication.

 

This was a more serious accident last September. Therefore , the importance of the UPS system is evident. Let's meet UPS in this issue.

 

1.The role of UPS

 

UPS in Chinese is " uninterruptible power supply ". It is an energy storage device, with rectifiers and inverters as the main components. It provides uninterruptible power supply with constant voltage and frequency for monitoring systems, automation instruments, remote communication systems and other equipment in substations.

 

The main role of the UPS system is twofold:

 

(1) As an AC power supply for important equipment, to prevent sudden power outages from affecting normal work and causing damage to the equipment;

 

(2) Eliminate "power pollution" such as surges, instantaneous high / low voltages, power line noise, and frequency offsets in mains power, improve power supply safety, and provide high-quality power supplies for computers and the like.

 

2. Classification of UPS

 

There are three main types of UPS systems: backup , interactive, and online .

 

(1) Backup type: It has functions such as automatic voltage stabilization and power failure protection. The conversion time is about 10ms. The AC power output by the inverter is a square wave. The structure is simple and the price is cheap.

 

(2) Interactive: with filtering function, strong ability to resist mains interference, conversion time is less than 4ms, inverter output is analog sine wave, and the price is lower than online;

 

(3) On-line: more complex structure, perfect performance, can continuously output pure sine wave AC power, can solve all power supply problems such as spikes, surges, frequency drifts; high price, usually used in key computers and network equipment, etc. In demanding environments.

3.Structure of UPS

 

The UPS system in the substation is generally composed of three parts: the main power UPS, the bypass voltage stabilization cabinet, and the output feeder cabinet (three in one can also be used at low power).


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