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What is UPS? Why use UPS? All the knowledge about UPS power supply is here(Part 2 - 8)
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What is UPS? Why use UPS? All the knowledge about UPS power supply is here(Part 2 - 8)

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  • Time of issue:2021-09-30
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(Summary description)UPS quality selection and configuration selection: UPS quality selection. UPS calculation and configuration. And battery calculation and configuration.

What is UPS? Why use UPS? All the knowledge about UPS power supply is here(Part 2 - 8)

  • Author:
  • Origin:
  • Time of issue:2021-09-30
  • Views:

(Summary description)UPS quality selection and configuration selection: UPS quality selection. UPS calculation and configuration. And battery calculation and configuration.

Information

UPS quality selection and configuration selection

 

1. UPS quality selection

 

UPS whole machine index-output.

 

Output voltage standard and accuracy (220/380VAC±1%).

 

Output frequency standard and accuracy (50HZ±0.01%).

 

Output power factor (0.7-1).

 

Output overload/short-circuit resistance capability (125% rated current, 10min150% rated current, 60s).

 

Three-phase unbalanced capability (100% unbalanced load, voltage unbalance <±5%).

 

Dynamic response (100% load, transient voltage fluctuation <5%, recovery time: ≤20ms).

 

Efficiency (90-94%).

 

Noise (50-75db).

 

Environmental indicators (temperature 0~40℃), humidity, altitude <1000 meters).

 

UPS whole machine index-efficiency calculation

 

UPS components efficiency: SCR rectifier 99%; IGBT rectifier 98%, IGBT inverter efficiency 96%, transformer efficiency 98%, filter 99%.

 

The efficiency of traditional UPS: SCR rectifier (99%) × IGBT inverter (96%) × output TX (98%) = 93%.

 

The efficiency of 12-pulse traditional UPS: input phase shift TX (98%) × dual SCR rectifier (98%) × IGBT inverter (96%) × output TX (98%) = 90%.

 

New UPS efficiency calculation: IGBT rectification (98%) × IGBT inverter (96%) = 94%.

 

UPS-battery management:
 

Charging protection (overvoltage and overcurrent charging protection, temperature compensation).
Discharge protection (setting and adjustment of shutdown cut-off voltage, automatic tripping).
Intelligent battery management (detection and alarm).

 

Backup time calculation and display: rated load backup time T, 75% rated load 1.6T, 50% rated load 2.5T, 33% rated load 4T.

 

Charging capacity and charging time: 10%~25% of full capacity charging capacity

 

Charging time calculation: T = AH/I charging × (charging efficiency 80%)

 

2. UPS configuration and selection

 

UPS classification and selection: working mode: backup, interactive, online.

 

Capacity: low power (1~10kVA); medium power (20~60kVA); high power (80~1000kVA).

 

Applicable environment: commercial, industrial, power plant, vehicle or ship.

 

Output transformer: high frequency machine, industrial frequency machine.

 

Power distribution part: cables and switches.

 

Capacity and model selection: user load, redundancy.

 

Load kind: IT type, inductive load, use environment-harmonics, transformer.

 

Computer room power distribution design: wire-in method, model cost and competitive advantage. User load; UPS output redundancy (70~80%) load crest factor (3:1) cannot exceed inverter overload capacity, load apparent power (KVA) cannot exceed UPS rated power * power factor conversion factor three-phase Load imbalance is less than 30%.

 

Harsh electrical and physical environment: power supply line voltage/frequency fluctuation, surge impact, peak sinking, high frequency interference, unstable environmental temperature and humidity, dust, corrosion, etc.

 

Structure: Input and output dual isolation, steel case, high IP protection level.

 

Applicable fields: steel, chemical industry, electric power, automobile, papermaking, coal, petroleum, tunnel.

 

Load type: heavy-duty machinery, production line equipment, DCS system, etc. UPS working loss, ventilation volume, full load loss of air-conditioning configuration (KW) = kVACos×(6~7.5%) cooling capacity of air-conditioning.

 

UPS Capacity(kVA) 40 80 100 160 200 300 400 600 800
Ventilation(a³/h) 2200 2400 2590 3500 3700 3900 4400 7500 9300

 

Conversion of output power-altitude: derate 1% for every 100 meters increase in altitude (typical UPS working altitude: 1000 meters)

 

Altitude Height(m) 1000 1500 2000 2300 3000
UPS output power conversion rate 1 0.85 0.79 0.75 0.69


3. Battery calculation and configuration

 

Accurate calculation: constant power calculation method.

 

The cut-off voltage is determined: 1.67V/cell<30 minutes of discharge; 30~60 minutes of 1.75V/cell discharge.

 

1.83V/cell>discharge for 60 minutes. Calculate the constant power data of each Cell battery, and select the battery specifications that meet the calculation results according to the manufacturer's constant power discharge data sheet.

 

Power distribution part: cables and switches

 

Input switch capacity and cable specifications:

 

Three-phase electrician rapid calculation method: input current (A) = 1.8XKVA, switching coefficient X1.2.

Single-phase electrician rapid calculation method: input current (A) = 5XKVA, switching coefficient X1.2.

 

Output switch capacity and cable specifications:

 

Three-phase electrician rapid calculation method: output current (A) = 1.5XKVA, switching coefficient X1.2.

 

Single-phase electrician rapid calculation method: output current (A) = 4XKVA, switching coefficient X1.2.

 

Battery switch capacity and cable specifications: discharge current (A) = kVACos/U battery voltage switch coefficient X1.2.

 

Cable length and voltage drop: such as 70mm, and the line resistance is 0.26Ώ/km.

 

Specifications of neutral wire and ground wire: neutral wire = 1 to 1.5 times the phase wire, and ground wire = phase wire

 

Power distribution part: cable and switch specifications

 

Cable rated current simple calculation method

 

Cable Specifications(mm2) 1/1.5/2.5 4/6 10/16 25/35/50 70/95/120 150/185 240 300
Nominal Current(A) X8 X6 X4 X2 X2.5 X2 X1.5 X1.2

 

Air switch specifications: R10, R16, R20, R25, R32, R40, R50, R63, R80, R100, R125, R160, R200, R250, R320, R400, R630, R800, R1250.

 

isolation transformer

  

High-frequency machine is equipped with 380V/380V output isolation transformer: capacity KVA=UPSKVA

 

Choose △/Y0 type isolation transformer, output neutral point is grounded, Y/Y type transformer bypass reverse irrigation will cause the danger of excessive DC voltage.

 

UPS is equipped with a 380V/220V output isolation transformer: the output capacity loss is 20-30%, and there is interference feedback to the inverter. Choose a transformer with high efficiency and low interference.

 

Bypass isolation transformer: to achieve electrical isolation of the neutral line.

 

 

What is UPS? Why use UPS? All the knowledge about UPS power supply is here(Part 1 - 8)- UPS types, functions and principles
What is UPS? Why use UPS? All the knowledge about UPS power supply is here(Part 3 - 8)- UPS basic maintenance
What is UPS? Why use UPS? All the knowledge about UPS power supply is here(Part 4 - 8)- 10 basic problems of UPS power supply

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