BSI PD IEC/TS 60871-3:2015
$142.49
Shunt capacitors for AC power systems having a rated voltage above 1 000 V – Protection of shunt capacitors and shunt capacitor banks
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 30 |
This part of IEC 60871 , which is a technical specification, gives guidance on the protection of shunt capacitors and shunt capacitor banks. it applies to capacitors according to IEC 60871‑1 .
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | CONTENTS |
| 7 | FOREWORD |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions 4 Internal fuses 4.1 General |
| 10 | 4.2 Fuse characteristics 4.2.1 Rated current 4.2.2 Rated discharge capability 4.2.3 Disconnecting capability 4.2.4 Voltage withstand capability after operation 4.3 Influence of capacitor element configuration on capacitor life 4.3.1 Capacitor with all elements connected in parallel 4.3.2 Capacitor with elements connected in series and parallel 5 External fuses 5.1 General |
| 11 | 5.2 Fuse characteristics 5.2.1 Rated current 5.2.2 Rated voltage 5.2.3 Time-current characteristics |
| 12 | 5.2.4 Discharge capability 5.3 Fuse types 5.3.1 General 5.3.2 Expulsion fuses Figures Figure 1 – Fuse types |
| 13 | 5.3.3 Current-limiting fuses 5.3.4 Combination current-limiting/expulsion fuses 5.4 Influence of capacitor bank configuration on fuse selection 5.4.1 Single series section grounded star and delta banks 5.4.2 Single series section ungrounded star banks 5.4.3 Multiple series section banks 5.5 Coordination with case rupture curves |
| 14 | 6 Unbalance detection 6.1 Operation 6.2 Types of unbalance protection 6.2.1 Neutral current (Figure 3) 6.2.2 Neutral voltage (Figure 4) |
| 15 | 6.2.3 Current unbalance between neutrals (Figure 5) 6.2.4 Phase voltage unbalance (Figure 6) 6.2.5 Voltage difference (Figure 7) 6.2.6 Current unbalance in bridge connection (Figure 8) 6.3 Current and voltage transformers 6.3.1 Current transformers |
| 16 | 6.3.2 Voltage transformers 6.4 Relays and protection settings 6.5 Sensitivity |
| 17 | 6.6 Initial unbalance 7 Overload current 7.1 Operation 7.2 Protective arrangement 7.3 Current transformers 7.4 Relays |
| 18 | 7.5 Protective settings 8 Over and undervoltage 8.1 Operation 8.2 Overvoltage protection 8.3 Undervoltage protection 8.4 Reclosing |
| 19 | 9 Other protection 9.1 Surge arresters 9.1.1 General 9.1.2 Operation 9.1.3 Lightning transients 9.1.4 Switching transients 9.1.5 Temporary overvoltages 9.1.6 Rated voltage |
| 20 | 9.1.7 Energy absorption 9.2 Damping devices 9.2.1 Capacitor switching 9.2.2 Inrush currents |
| 21 | 9.2.3 Voltage transients 9.2.4 Ratings 9.3 Synchronized switching 9.3.1 Operation 9.3.2 Breaker contacts delay 10 Safety 10.1 Discharging devices 10.1.1 General |
| 22 | 10.1.2 Internal resistors 10.1.3 External discharge devices 10.1.4 Discharging after disconnection 10.2 Dead metallic parts |
| 23 | Figure 2 – Typical case rupture curves for approximately 30 000 cm³ case volume Figure 4 – Star connection with voltage transformer between neutral and ground Figure 3 – Star connection with the neutral grounded through a current transformer |
| 24 | Figure 6 – Double-star connection with ungrounded neutral Figure 5 – Star connection with ungrounded neutral and voltage transformers connected in an open delta Figure 8 – Bridge connection Figure 7 – Star connection with grounded neutraland voltage transformers connected indifferential measurement Figure 9 – Line overcurrent relays for capacitor bank, grounded |
| 25 | Figure 10 – Line overcurrent relays for capacitor bank, ungrounded Table 1 – Melting currents for type-K (fast) fuse links, in amperes |
| 26 | Table 2 – Melting currents for type-T (slow) fuse links, in amperes |
| 27 | Bibliography |
