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Power Supply Devices and Systems of Relay Protection

Publisher: CRC PRESS (Taylor & Francis Group)
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82.00 GBP


About the book

This book describes the arrangement, mode of action and problems of secondary power supplies of digital protective relays, stationary accumulator batteries, battery chargers, uninterruptible power supplies and auxiliary AC and DC power supply systems of substation and power plants. The book also reviews the issues of insulation monitoring in DC systems, the problems of monitoring the continuity of substation battery circuit, problems of voltage dips and how to address them as well as a number of other questions that arise in the course of the exploitation of auxiliary power systems and the on site needs of substations and power plants.  
  In addition, the book provides detailed descriptions of transistors, thyristors, optocouplers and relays and their principles of operation in order to facilitate understanding for power engineering specialists who work with the electronic equipment listed above, but are not specialists in the field of electronics.
  The book is meant for engineers and technicians who use AC and DC auxiliary power systems of power plants and substations, as well as relay protection systems. The book may be useful for teachers and students of corresponding disciplines at vocational schools and higher education institutions.

1. Basic Components of Digital Protective Relays
1.1 Semiconducting Materials and the p-n Junction
1.2 The Principle behind Transistors
1.3 Some Transistor Kinds
1.3 General Modes of the Bipolar Transistor
1.4 Transistor Devices in Switching Mode
1.5 Thyristors
1.6 Optocouplers
1.7 Electromagnetic Relays


2. Secondary Power Supply
2.1 Comparative characteristic of linear and swith-mode power supply
2.2 Problems with electrolytic capacitors 
2.2.1 Design Features of Aluminum Electrolytic Capacitors
2.2.2 Conclusions and Recommendations
References  for
Chapter 2 


3. Battery Chargers (BC)
3.1 Purpose and Modes of Operation of BC  
3.2 Arrangement and Principle of Operation of a Classical BC on  Thyristors  
3.3 BCs with a Function of Discharging the Battery  
3.4 BC with Two Rates of Output Voltage  
3.5 Principle of Action of BC with a High Frequency Link 
3.6 Ferroresonant-type BCs
3.7 Auto-Reclosing of a BC
3.8 A Problem of High Capacitance on BCs Output Ports
3.9  Arrangement of Alarm about Failure of Transformers in the Control Unit of a BC 
3.10 Problems of Electromagnetic Relays in BCs 
3.11  A Device to Monitoring  Proper Ventilator Functionality in Sites with Batteries 
References  for Chapter 3

4. Uninterruptable Power Supply (UPS) 
4.1 Diversity of Uninterruptable Power Supplies 

4.2 Static Switch4.3 Inverter

4.3 Inverter
4.4 Group Powering of UPS
4.5 A Problem of Energy Quality in Networks with UPS
4.6 Addition Problems of the UPS
4.7 Dynamic and Hybrid UPS

References  for Chapter 4

5. Lead-Acid Accumulator Batteries
5.1 Background

5.2 Principle of Lead-Acid Accumulator Operation
5.3 Effect of Electrodes Sulfation on Accumulator Performance
5.4 Classification of Lead-Acid Accumulators
5.5 Types of Lead-Acid Accumulator Batteries Plates
5.6 Types of Electrolyte
5.7 Dry-Charged Accumulator Batteries
5.8 What is Accumulator Battery’s Capacity
5.9 Selection of Accumulator Battery 
References  for
Chapter 5

6. Systems for Supervision Substation Battery Continuity
6. 1 Existing System for Supervision Substation Battery Continuity
6.2 Suggested Method for Supervision Substation Battery Continuity
6.3 Device for Supervision Battery Circuit Based on Nonlinear Shunt 

6.4 Using a Standard Shunt as Current Sensor 

6.5 Usage of the Hall-Effect Sensor in System for Supervision Battery Circuit  

6.6 The Newest Development and Prospects of Their Applications

6.7 Conclusion

References  for
Chapter 6

7. Backup of Substation DC Auxiliary Power Systems (DCAPS)
7.1 Characteristics of Backup Layout with Diodes 
7.2 DPR Protection Device
7.3 Automatic Reclosing Device for DCAPS  
References  for Chapter 7

8. Insulation Problems in Substation DC Auxiliary Power Supply
8.1 Faulty Actuation of a Relay Protection at Grounding of One of Poles of Auxiliary DC Power Supply 
8.2 Insulation Problems in Substation DCAPS
References  for Chapter 8

9. Voltage Disturbances in Auxiliary Power Supply
9.1 Electromagnetic Disturbances in the Power Network
9.1.1 Blackout
9.1.2 Noise 
9.1.3 Sag 
9.1.4 Spike 
9.1.5 Surge 
9.2 Voltage Sags in AC Network 
9.2.1 Voltage Sags in the Manufacturing Plants 0.4 kV Networks
9.2.2 Voltage Sags in 0.4 kV Auxiliary AC Networks 
9.3 Problematic Action of the Powerful Contactors as Changeover from Main to Reserved Auxiliary Power Supply on Substation 
9.3.1 Offered Solution for the Problem 
9.3.2 Conclusion 
9.4 Problems in Auxiliary DC Power Supply 
9.4.1 Problem of Power Supply of Relay Protection at
 Emergency Mode 
9.6  Voltage Dips in Auxiliary Power Supplies Substation Systems 
 References  for Chapter 9

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