Content course on sizing and design of DC power systems for telecommunications and critical systems (Version 1)

In this post, we present you the table of contents of the course content. Upon purchasing the course, you will be entitled to 10 free consultations via email.

This service will be available for the following 6 months after your purchase. You can address anything from learning doubts to clarifications for any project you are working on.

All correspondence will be answered within 12 hours of receiving it. The responses will be personalized, and you will receive a confirmation email once the message has been read.

Upon making your purchase, you will receive the contact details and ways to get in touch with our experts.

The goal of the energydcac team is to ensure your complete satisfaction. All you will need are a calculator, note-taking materials, and a strong willingness to learn.

We also welcome your suggestions and advice for improving this material. Feel free to provide any feedback, as it will be well-received.

To acquire this material, click here. Don’t miss out on our offer – act quickly to take advantage of it!

Below, we present the entire range of topics covered in this document.

Course Content

INDEX

INTRODUCTION.. 1

GLOSSARY. 2

GENERALITIES OF THIS COURSE. 5

About the scope. 5

Figure 1. AC and DC power system diagram for telecommunications and critical systems. 5

Consolidation of knowledge. 6

CHAPTER 1: GENERAL DESIGN CRITERIA FOR POWER SYSTEMS IN TELECOMMUNICATIONS AND CRITICAL SYSTEMS  8

1.1        Rectifier equipment. 8

1.1.1         Electrical 8

1.1.2 Environmental 8

1.1.3 General 8

1.2 Batteries. 8

1.2.1 Eléctrical 8

1.2.2 Environmental 9

1.2.3 Chemicals. 9

1.2        Inverter. 9

1.3.1 Eléctrical 9

1.3.2 General 9

1.4 UPS (Uninterruptible Power Supply). 9

1.4.1 Eléctrical 10

1.4.2         General 10

1.4.3         Direct calculations. 10

CHAPTER 2: THE POWER DISTRIBUTION PANEL. 11

2.1 Specifications to be provided to the distribution panel supplier. 14

2.2 Self-assessment. 15

CHAPTER 3: AC AND DC PROTECTIONS. 17

3.1. Calculation of protection capacity. 18

3.1.1. For the case of telecommunication equipment loads. 18

3.1.2. For the case of battery banks. 24

3.1.3. For the case of AC power supply. 24

3.2 Self-assessment. 24

CHAPTER 4: SELECTION OF ELECTRICAL CONDUCTORS AND CABLES. 25

4.1. Verification based on DC cable ampacity. 25

4.1.1. Verification by ampacity for battery banks. 25

4.1.2. Verification by ampacity for loads. 26

4.2. Verification by voltage drop of the DC cabling. 27

4.2.1. Voltage drop verification for batteries. 28

4.2.2. Verification of voltage drop for loads. 28

4.3. Special Case: What happens when the conductor gauge exceeds the capacity of the protection?  33

4.4 Electrical conduits. 34

4.5. Example of Application. 36

4.6.- Self-assessment. 38

CHAPTER 5: AC – DC RECTIFIER SELECTION.. 39

5.1. Calculation of the number of rectifiers. 40

5.1.1 Data to be known. 40

5.1.2 Calculating the number of rectifiers. 41

5.1.3 Applying the redundancy criterion. 42

5.2 Practical application example. 42

5.3 Self-assessment. 44

CHAPTER 6: BATTERY SELECTION.. 45

6.1 Types of industrial battery banks currently used in telephony. 45

6.1.1 Industrial open, flooded, or vented batteries. 45

6.1.2 Sealed or valve-vegulated industrial batteries. 47

6.2 Procedure for battery bank selection. 48

6.2.1 For open-cell batteries: electrolyte density or specific gravity. 49

6.2.2 Backup charge current (IC). 49

6.2.3 Reserve. 49

6.2.4 Definition of autonomy time (TA). 50

6.2.5 Selection of cut-off voltage. 50

6.2.6 Preselection of the battery bank considering autonomy and maximum electrical load. 51

6.2.7 Battery bank capacity correction factor for temperature. 54

6.2.8 Battery bank capacity correction factor for aging. 55

6.2.9 Battery bank configuration. 56

6.2.10 Determine if more than one battery bank is required. 57

6.2.11 Selection of battery bank technology (flooded or sealed valve-regulated batteries). 59

6.2.12 Selection of DC protection for the battery bank. 61

6.2.13 Battery bank conductor selection. 62

6.2.14 Calculation of the battery bank recharge current, which the distribution panel must supply in its charger function. 62

6.2.15 Verification of the distribution panel’s capacity to supply the recharge current for the batteries  62

6.2.16 Grounding or earthing of a battery bank. 65

6.3 Practical example of backup system calculation with batteries. 67

6.3.1 For open-cell batteries: electrolyte density. 67

6.3.2 Backup charge current (IC). 67

6.3.3 Reserve. 67

6.3.4 Definition of autonomy time (TA). 67

6.3.5 Cut-off voltage selection. 68

6.3.6 Pre-selection of the battery bank considering maximum electrical load and autonomy. 68

6.3.7 Battery bank capacity correction factor for temperature. 70

6.3.8 Battery bank capacity correction factor for aging. 71

6.3.9 Battery bank configuration. 72

6.3.10 Determine if more than one battery bank is required. 72

6.3.11 Battery bank technology selection (open-cell or valve-regulated batteries). 73

6.3.12 Selection of DC protection for the battery bank. 73

6.3.13 Battery bank conductor selection. 73

6.3.14 Calculation of the battery bank recharge current. 76

6.3.15 Verification of the power panel’s capacity to supply the recharging current for the batteries  76

6.3.16 Battery bank grounding connection. 77

6.4 Self-assessment. 78

CHAPTER 7: INTEGRATED EXAMPLE OF DESIGN AND ENGINEERING CALCULATIONS FOR A COMPLETE DC POWER SYSTEM… 80

7.1 Requirements and characteristics. 80

7.2 Protection selection. 81

7.3 Selection of the conductor for each equipment’s power circuit. 82

7.3.1 Ampacity preselection. 82

7.3.2 Preselection by voltage drop. 83

7.3.3 Conductors selected per circuit. 84

7.3.4 Conduits or ducts. 85

7.4 Calculating the number of rectifiers. 85

7.5 Calculation of the DC backup battery system.. 86

7.5.1 Electrolyte density. 86

7.5.2 Charging current to backup (IC). 86

7.5.3 Reserve percentage. 87

7.5.4 Definition of autonomy time (TA). 87

7.5.5 Selection of cut-off voltage. 87

7.5.6 Preselection of the battery bank considering maximum autonomy and electrical load. 87

7.5.7 Battery bank capacity correction factor for temperature. 87

7.5.8 Battery bank capacity correction factor for aging. 88

7.5.9 Battery bank configuration. 88

7.5.10 Determine if more than one battery bank is required. 88

7.5.11 Selection of DC protection for the battery bank. 88

7.5.12 Selection of battery bank conductors. 89

7.5.13 Calculation of battery bank charging current. 90

7.5.14 Capacity check of the power panel to supply battery charging current. 90

7.5.15 Grounding connection of the battery bank. 91