DOWEI

CONTENTS

FOREWORD 6

1      Scope 8

2      Normative references 9

3      Terms and definitions 9

4      Service conditions 12

4.1       Normal service condition s 12

4.2       Unusual service conditions 13

5      Quality requirements and tests 13

5.1        General 13

5.2       Test conditions 13

6      Classification of tests 13

6.1        General 13

6.2        Routine tests 13

6.3       Type tests 14

6.4       Acceptance tests 14

6.5       Endurance test (special test) 14

7      Capacitancemeasurement (routine test) 14

7.1        Measuring procedure 14

7.2       Capacitance tolerances 15

8      Measurement of the tangentof the loss angle (tan δ)of the capacitor (routine test) 15

8.1        Measuring procedure 15

8.2        Loss requirements 16

8.3        Losses in external fuses 16

9      Voltage test between terminals (routine test) 16

9.1        General 16

9.2       AC test 16

9.3        DC test 16

10    AC voltag e test between terminals and container (routine test) 16

11    Test of internal discharge device (routine test) 17

12    Sealing test (routine test) 17

13    Thermal stability test (type test) 17

13.1     General 17

13.2     Measuring procedure 17

14    Measurement of the tangent of the loss angle (tan  δ)of the capacitor at elevated                 

temperature (type test) 18

14.1     Measuring procedure 18

14.2     Requirements 18

15    Voltage tests between terminals and container (type tests) 19

15.1     AC voltage test between terminals and container 19

15.2     Lightning impulse test between terminals and container 19

16    Overvoltage test (type test) 20

16.1     General 20

16.2     Conditio ning of the sample before the test 20

16.3     Test procedure 20

16.4     Acceptance criteria 21

16.5     Validity of test 21

16.5.1       General 21

16.5.2       Element design 21

16.5.3       Test unit design 21

16.5.4       Waveform of overvoltage 21

17    Short-circuitdischarge test (type test) 22

18    Insulation levels 22

18.1     Standard insulation values 22

18.2     General requirements 23

18.2.1       General 23

18.2.2       Adjacent insulating components and equipment 23

18.2.3       Capacitors insulated from ground 23

18.2.4       Capacitors with neutral connected to ground 23

18.3     Test between terminals and container of capacitor units 24

18.4     Capacitors in single-phasesystems 24

19    Overloa ds – Maximum permissible voltage 27

19.1     Long duration voltages 27

19.2     Switching overvoltages 27

20    Overloads – Maximum permissible current 27

21    Safety requirements for discharge devices 28

22    Safety requirements for container connections 28

23    Safety requirements for protection of the environment 28

24    Other safety requirements 28

25    Markings of the capacitor unit 29

25.1     Rating plate 29

25.2     Standardized connection symbols 29

25.3     Warning plate 29

26    Markings of the capacitor bank 30

26.1     Instruction sheet or rating plate 30

26.2     Warning plate 30

27    Guide for installation and operation 30

27.1     General 30

27.2     Choice of the rated voltage 30

27.3     Operating temperature 31

27.3.1       General 31

27.3.2       Installation 31

27.3.3       High ambient air temperature 32

27.4     Special service conditions 32

27.5     Overvoltages 32

27.5.1       General 32

27.5.2       Restriking of switches 33

27.5.3       Lightning 33

27.5.4       Motor self-excitation 33

27.5.5       Star-deltastarting 33

27.5.6       Ca pacitor unit selection 33

27.6     Overload currents 33

27.6.1       Continuous overcurrents 33

27.6.2       Transient overcurrents 34

27.7     Switching and protective devices 34

27.7.1       Withstand requirements 34

27.7.2       Restrike-freecircuit-breakers 35

27.7.3       Relay settings 35

27.8     Choice of insulation levels 36

27.8.1       General 36

27.8.2       Altitudes exceeding 1 000 m 36

27.8.3       Influence of the capacitor itself 36

27.8.4       Overhead ground wires 38

27.9     Choice of creepage distances and air clearance 38

27.9.1       Creepage distance 38

27.9.2       Air clearances 39

27.10   Capacitors connected to systems with audio-frequency remote control 41

Annex A (normative)  Precautions to be taken to avoid pollution of the  environment by              

polychlorinated biphenyls 42

Annex B (normative)  Additional definitions, requirements and  tests for power filter                    

capacitors 43

Annex C (normative)  Test requirements and application guide for  external fuses and                

units to be externally fused 45

C.1       General 45

C.2       Terms and definitions 45

C.3       Performance requirements 45

C.4       Tests 45

C.4.1         Tests on fuses 45

C.4.2        Type tests on capacitor containers 45

C.5       Guide for coordination of fuse protection 46

C.5.1         General 46

C.5.2         Protection sequence 46

C.6       Choice of fuses 46

C.6.1         General 46

C.6.2        Non current-limitingfuses 47

C.6.3        C urrent-limitingfuses 47

C.7       Information needed by the user of the fuses 47

Annex D (informative)  Formulae for capacitors and i nstallations 48

D.1      Computation of the output of three-phasecapacitors from three single-phase             

capacitance measurements 48

D.2       Resonant frequency 48

D.3       Voltage increase 48

D.4       Inrush transient current 49

D.4.1        Switching in of single capacitor bank 49

D.4.2        Switching on of a bank in parallel with energized bank(s) 49

D.5       Discharge resistance in single-phase unit 49

D.6       Discharge time to 10 % of rated voltage 49

Annex E (informative)  Capacitor bank fusing and unit arrangement 51

E.1       General 51

E.2       Internally fused capacitor bank 51

E.3       Externally fused capacitor bank 51

E.4       Fuseless capacitor bank 51

Bibliography 54

Figure 1 – Time and amplitude limits for an overvoltage period 22

Figure 2 – Bank isolated from ground 37

Figure 3 – Bank isolated from ground  (containers connected to ground) 37

Figure 4 – Bank connected to ground 38

Figure 5 – Air clearance versus AC withstand 41

Figure E.1 – Typical connections between capacitor units 52

Figure E.2 – Typical connections between elements within a capacitor unit 53

Table 1 – Letter symbols for upper limit of temperature range 12

Table 2 – Ambient air temperature for the thermal stability test 18

Table 3 – Standard insulation levels for range I (1 kV < U m <245 kV) 25

Table 4 – Standard insulation levels for range II (U m > 245 kV) 26

Table 5 – Admissible voltage levels in servi ce 27

Table 6 – Insulation requirements 36

Table 7 – Specific creepage distances 38

Table 8 – Correlation between standard lightning impulse withstand  voltages and minimum air clearances (Table A.1 from IEC 60071-2:1996) 40

SHUNT CAPACITORS FOR AC POWER SYSTEMS

HAVING A RATED VOLTAGE ABOVE 1 000 V –

Part 1: General

1    Scope

This part of IEC 60871 is applicable to  both capacitor units and capacitor banks intended to be used, particularly, for power-factor correction of a .c . power systems having a rated voltage above 1 000 V and frequencies of 15 Hz to 60 Hz .

This  part  of  IEC 60871  also  applies  to  capacitors  intended  for  use  in  power  filter  circuits . Additional definitions, requirements and tests for filter capacitors are given in Annex B.

Additional requirements for capacitors protected by internal fuses as well as requirements for the internal fuses are given in IEC 60871-4.

Requirements for capacitors to be protected by external fuses, as well as requirements for the same, are given in Annex C.

This standard does not apply to capacitors of the self-healing metallized dielectric type. The following capacitors are excluded from this part of IEC 60871:

–    capacitors  for  inductive  heat-generating  plants  operating  at  frequencies  between  40 Hz and 24 000 Hz (IEC 60110-1);

–    series capacitors for power systems (see the IEC 60143 series);

–    capacitors for motor applications and the like (see the IEC 60252 series);

–    coupling capacitors and capacitor dividers (IEC 60358);

–    shunt capacitors for a .c . power systems having rated voltage up to and including  1 000 V (see the IEC 60831 and IEC 60931 series);

–    small  a .c .  capacitors  to  be  used  for  fluorescent  and  discharge  lamps  (IEC 61048  and IEC 61049);

–    capacitors to be used in power electronic circuits (IEC 61071);

–    capacitors for microwave ovens (IEC 61270-1);

–    capacitors for suppression of radio interference;

–    capacitors intended for use with a .c . voltage superimposed on d.c . voltage .

Accessories such as insulators , switches , instrument transformers , external fuses , etc . are in

accordance with the relevant IEC standards .

The object of this part of IEC 60871 is as follows:

a)   to formulate uniform  rules regarding the  performance and rating of units and  banks, and the testing of units ;

b)   to formulate specific safety rules;

c)   to provide a guide for installation and operation .

2    Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application . For dated references, only the edition cited applies . For undated   references,    the    latest   edition    of   the    referenced    document   (including    any amendments) applies .

IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements IEC 60071-1:2006, Insulation co-ordination – Part 1: Definitions, principles and rules

IEC 60549, High-voltage fuses for the external protection of shunt capacitors

IEC 60815 (all parts), Selection and dimensioning of high-voltage insulators intended for use in polluted conditions

IEC 60871-4:1996,  Shunt  capacitors  for  AC  power  systems  having  a  rated  voltage  above 1000 V – Part 4: Internal fuses

Table 4 – Standard insulation levels for range II (Um > 245 kV)

Bibliography

IEC 60038:2009, IEC standard voltages

IEC 60050-151:2001 ,  International  Electrotechnical   Vocabulary  –  Part   151:  Electrical  and magnetic devices

IEC 60050-436:1990 ,   International   Electrotechnical    Vocabulary   –   Chapter   436:    Power capacitors

IEC 60071-2:1996 , Insulation co-ordination – Part 2: Application guide IEC 60099 (all parts) , Surge arresters

IEC 60110-1 , Power capacitors for induction heating installations – Part 1: General IEC 60143 (all parts) , Series capacitors for power systems

IEC 60252 (all parts) , AC motor capacitors

IEC 60273 ,  Characteristic  of  indoor  and  outdoor  post  insulators  for  systems  with  nominal voltages greater than 1 000 V

IEC 60358 , Coupling capacitors and capacitor dividers

IEC/TS  60815-2 ,  Selection  and  dimensioning  of high-voltage  insulators  intended  for use  in polluted conditions – Part 2: Ceramic and glass insulators for a.c. systems

IEC/TS  60815-3 ,  Selection  and  dimensioning  of high-voltage  insulators  intended  for use  in polluted conditions – Part 3: Polymer insulators for a.c. systems

IEC 60831 (all parts), Shunt power capacitors of the self-healing type for a.c. systems having a rated voltage up to and including 1 000 V

IEC/TS  60871-2 ,  Shunt  capacitors  for  a.c.  power  systems  having  a  rated  voltage  above 1 000 V – Part 2: Endurance testing

IEC 60871-3 , Shunt capacitors for a.c. power systems having a rated voltage above  1 000 V – Part 3: Protection of shunt capacitors and shunt capacitor banks

IEC 60931  (all  parts),  Shunt power capacitors  of the  non-self-healing  type  for a.c.  systems having a rated voltage up to and including 1000 V

IEC/TR 60996 ,   Method  for  verifying   accuracy  of  tan   delta   measurements   applicable   to capacitors

IEC 61048 ,  Auxiliaries   for  lamps  –   Capacitors   for  use   in  tubular  fluorescent  and   other discharge lamp circuits - General and safety requirements

IEC 61049 ,  Capacitors  for  use  in   tubular  fluorescent  and  other  discharge  lamp   circuits. Performance requirements

IEC 61071, Capacitors for power electronics

IEC 61270-1, Capacitors for microwave ovens – Part 1: General

IEC 61642,  Industrial a.c. networks  affected by harmonics – Application  of filters  and shunt capacitors

IEEE 18, IEEE Standard for Shunt Power Capacitors

IEEE 1036, Guide for Application of Shunt Power Capacitors