UPS Sizing Calculations Course

Course Description:

This course is intended to prepare the target persons with the ability to perform Stationary UPS Sizing Calculations.

The targeted Persons:

Design engineers, new graduate engineers, under graduate engineering students.

Skills Development:

On completion of this course the target person will be able to:

• Know the different Classification of UPS,
• Know the different configurations, topologies & Distribution Architecture of UPS,
• Know the different components of a UPS,
• Know Transformer Arrangements in Practical UPS Systems,
• Know the Evaluation Criteria for Selecting an UPS
• make The UPS sizing calculations steps
• Make Rectifier/Charger Sizing Calculations
• Make Inverter sizing calculations & Static Switch Sizing
• make The Battery sizing calculations
• Select and size the UPS protective devices (CBs or Fuses) and cables
• Size a generator set for UPS system
• Make Battery Room Ventilation Calculations
• Determine Floor Space Requirements for a UPS

Course Outline:

Subject

Article

Applicable Standards for UPS Systems

What is a UPS?

Why do we need a UPS?

UPS Rating

Classification of UPS:

1-Voltage range,

2-No. of phases,

3- Mobility,

4- Technological design,

5- Physical Size/capacity,

6- Form factor/ configurations:

6.1- “N” System Configuration

6.2- “N+1” System Configuration, which includes:

• Isolated Redundant Configuration (N +1)
• Parallel Redundant Configuration (1+1)
• Parallel Redundant Configuration (N +1)
• Parallel Redundant Configuration (N +2) and so on

6.3- Parallel Redundant with Dual Bus Configuration (N+1 or 1+1)

6.4- Parallel Redundant with STS Configuration

• Parallel Redundant Configuration (1+1) + STS
• Parallel Redundant Configuration (N+1) + STS

6.5- System plus System 2(N+1), 2N+2, [(N+1) + (N+1)], and 2N

7- According to UPS Topology

7.1 Off-line or Standby UPS,

7.2 Line Interactive UPS,

7.3 Standby-Ferro UPS,

7.4 Online Double Conversion UPS,

7.5 The Delta Conversion On-Line UPS.

8- According to UPS Distribution Architecture

8.1 Centralized UPS Configuration,

8.2 Distributed (Decentralized) UPS Configuration,

8.2.1 Distributed UPS-Zonewise Configuration

8.3 Hybrid UPS Configuration.

Conventional (Monolithic) Vs Modular UPS System:

• Deploy UPSs in parallel,
• Deploy UPSs in Series,
• Use modular UPS products.

Three Basic Configurations Of Mains And Bypass For A UPS System:

• Single mains,
• Single mains without bypass,
• Dual mains.

9-According to Use of transformers with the UPS:

• Transformer based,
• Transformer less UPS,
• Transformer less UPS with external input/ output transformer.

Transformer Arrangements in Practical UPS Systems:

1-Transformer options for the “single mains” configuration

2-Transformer Options for the “Dual Mains” Configuration

3- Transformer options for “single mains without bypass”

Components of Online Double Conversion UPS:

1- Rectifier,

2- Inverter,

3- Energy Storage system:

3.1 Battery

Components of Online Double Conversion UPS– Part One

3.1.1 Battery Configurations

• Serial Strings,
• Parallel Strings.

3.1.2 Battery Size and Location

3.1.3 Battery Transition Boxes

3.1.4 Battery Monitoring

3.2 Energy Storage System – Flywheel

3.3 Energy Storage system – Super Capacitors

3.4 Hydrogen Fuel Cells

4- Static switch

Earthing Principles of UPS Systems

Evaluation Criteria for Selecting an UPS

Evaluation Criteria for Selecting an UPS-Part One

Example: Selecting an Uninterruptible Power Supply (UPS)

UPS System Ratings and Service Conditions

• First: from IEC 60146-4
• Second: according to American standards

The UPS sizing calculations steps

Stationary UPS Sizing Calculations – Part One

2- Rectifier/Charger Sizing Calculations

3- Inverter sizing calculations & Static Switch Sizing

4- The Battery sizing calculations

First: The Manufacturers’ methods, which include:

• Method#1:Watts per cell method
• Method#2:Watts per bank method
• Method#3:Ampere per cell method

Second: The IEEE methods of Battery Sizing Calculations which includes:

• Method#1: The IEEE 485 method,
• Method#2: The IEEE 1184 method.

- UPS Backup time calculation

- Selection and sizing of UPS protective devices (CBs or Fuses)

Selection of UPS Cables

Sizing of UPS Cables:

• UPS Input Cables,
• UPS Output Cables,
• Neutral Conductors,
• UPS to Battery Cables.

Sizing a generator set for UPS system

Battery Room Design Criteria

Ventilation Design Criteria

Battery Room Ventilation Calculations:

• NFPA method,
• British (metric) units method.

Requirement of Air Conditioner for UPS

Requirements for UPS Installation:

• Location,
• Ventilation,
• Floor loading capacity,
• Floor Space Requirements.

UPS Controls, Instruments, Alarms and Indicating Devices

UPS Testing Requirements