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Protection Devices andSystems forHigh-Voltage Applications

Vladimir Gurevich

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VIII ontents

4 Low -Voltage Switching Devices for High-Voltage Pow er Supply 654.1 Soft-Start Thy ristor Co ntactor 654.2 Soft-Start Co ntactor on IG B T Trans istors 674.3 Power-Co mbined Device 694.4 Hybrid Pow er Relay VI4.5 Hybrid Switch, Based on Anti-Parallel

Conne cted Thyristors (SA PT ) 834.6 Tem perature Influence on SA PT Operation 934.7 Hybrid Reed-T ransistor Sw itching Device for D C Circuits 102

5 Ap plications for Pow er Eng ineering 1115.1 Ne w Relay Protection Tech nology 1115.2 Hybrid Ove r-Current Protection Relay Qu asitron Series 1135.3 Are Prote ction De vice for Sw itchbo ard 6 - 24 kV 1215.4 Au tom atic Re set Short Circuit Indicator for 6 - 24 kV Bu s B ars 1235.5 High -Voltage Thresho ld Current Transduce r 1255.6 Single-Phase Groun d Faults Protection 1315.7 Groun d Circuit Fault Indicator for Und erground HV Cable

Network 1345.8 Cu rrent Transform ers Protec tion from Seco ndary Circuit

Disconnection 1395.9 Protection Aga inst Ferroresonan ce in Voltage Transformers 1425.10 HV Indicators for Switchgears and Sw itchboards 1455.11 High-Sp eed Voltage Unb alance Relay 152

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ontents IX

Appendix C: Environmental Tests of RG-relays for MIL-STD-202Requirements 211AppendixD:Components Recommended for Use in HV ProtectionDevices 215Dl Reed Switches 216

D2 Solid State Modules 221D3 High-Voltage Thyristors 232D4 High-Voltage High Power Transistors 236D5 Low-Voltage Electromagnetic Relays 242D6 Connectors 265D7 HV Cables and Cable Assemblies 269D8 Capacitors DC/AC 273Appendix E:Insulation Materials for Production of RG-relays 279Appendix F: Engineering Equations for Calcuiations of MagneticConductivity in Magnetic Circuits and Electrical Fieldsfor Some Forms of Electrodes 285Index 291