IEC 60252-2 : 2010/2013 AC motor capacitors - Part 2 Motor start capacitors (Full) | Cộng đồng Kỹ thuật cơ điện Việt Nam EBOOKBKMT

IEC 60252-2:2010 applies to motor start capacitors intended for connection to windings of asynchronous motors supplied from a single-phase system having the frequency of the mains. Covers impregnated or unimpregnated metallized motor start capacitors having a dielectric of paper or plastic film, or a combination of both and electrolytic motor start capacitors with non-solid electrolyte, with rated voltages up to and including 660 V. The main changes with respect to the previous edition are:

- definition of segmented film capacitors;

- clearer definition of the purpose of d.c. conditioning in destruction test.

CONTENTS:

FOREWORD ...........................................................................................................................4

1 Scope ...............................................................................................................................6

2 Normative references .......................................................................................................6

3 Terms and definitions .......................................................................................................7

4 Service conditions .......................................................................................................... 10

4.1 Normal service conditions ..................................................................................... 10

4.2 Preferred tolerances on capacitance ..................................................................... 11

5 Self-healing motor start capacitors ................................................................................. 11

5.1 Quality requirements and tests .............................................................................. 11

5.1.1 Test requirements...................................................................................... 11

5.1.2 Nature of tests ........................................................................................... 11

5.1.3 Type tests ................................................................................................. 11

5.1.4 Routine tests ............................................................................................. 14

5.1.5 Tangent of the loss-angle measurement .................................................... 14

5.1.6 Visual examination .................................................................................... 14

5.1.7 Voltage test between the terminals ............................................................ 14

5.1.8 Voltage test between terminals and case ................................................... 14

5.1.9 Capacitance measurement ........................................................................ 15

5.1.10 Check of dimensions ................................................................................. 15

5.1.11 Mechanical tests ........................................................................................ 15

5.1.12 Sealing test ............................................................................................... 17

5.1.13 Endurance test .......................................................................................... 17

5.1.14 Damp heat test .......................................................................................... 19

5.1.15 Self-healing test ........................................................................................ 19

5.1.16 Destruction test ......................................................................................... 20

5.1.17 Resistance to heat, fire and tracking .......................................................... 24

5.2 Overloads .............................................................................................................. 25

5.2.1 Maximum permissible voltage .................................................................... 25

5.2.2 Maximum permissible current .................................................................... 25

5.2.3 Maximum permissible reactive output ........................................................ 25

5.3 Safety requirements .............................................................................................. 25

5.3.1 Creepage distances and clearances .......................................................... 25

5.3.2 Terminals and connecting cables ............................................................... 26

5.3.3 Earth connections ...................................................................................... 26

5.3.4 Discharge devices ..................................................................................... 27

5.3.5 Pollution .................................................................................................... 27

5.4 Marking ................................................................................................................. 27

6 Electrolytic motor start capacitors ................................................................................... 28

6.1 Quality requirements and tests .............................................................................. 28

6.1.1 Test requirements...................................................................................... 28

6.1.2 Nature of tests ........................................................................................... 28

6.1.3 Type tests ................................................................................................. 29

6.1.4 Routine tests ............................................................................................. 31

6.1.5 Visual examination .................................................................................... 31

6.1.6 Voltage test between the terminals ............................................................ 31

6.1.7 Voltage test between terminals and case ................................................... 31

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60252-2 IEC:2010+A1:2013 – 3 –

6.1.8 Capacitance and power factor measurement ............................................. 32

6.1.9 Check of dimensions ................................................................................ 33

6.1.10 Mechanical tests ...................................................................................... 33

6.1.11 Sealing test.............................................................................................. 35

6.1.12 Endurance test ......................................................................................... 35

6.1.13 Damp heat test ........................................................................................ 37

6.1.14 Pressure relief test ................................................................................... 37

6.1.15 Resistance to heat, fire and tracking ......................................................... 38

6.2 Overloads ............................................................................................................ 38

6.2.1 Maximum permissible voltage ................................................................... 38

6.2.2 Maximum permissible current ................................................................... 38

6.2.3 Maximum permissible reactive output ....................................................... 39

6.3 Safety requirements ............................................................................................. 39

6.3.1 Creepage distances and clearances ......................................................... 39

6.3.2 Terminals and connecting cables .............................................................. 39

6.3.3 Earth connections .................................................................................... 39

6.3.4 Discharge devices .................................................................................... 40

6.3.5 Pollution .................................................................................................. 40

6.4 Marking ............................................................................................................... 40

7 Guidance for installation and operation ......................................................................... 41

7.1 General ............................................................................................................... 41

7.2 Choice of rated voltage ........................................................................................ 41

7.2.1 Measurement of working voltage .............................................................. 41

7.2.2 Influence of capacitance........................................................................... 42

7.3 Checking capacitor temperature ........................................................................... 42

7.3.1 Choice of maximum permissible capacitor operating temperature .............. 42

7.3.2 Choice of minimum permissible capacitor operating temperature ............... 42

7.4 Checking transients ............................................................................................. 42

7.5 Storage of electrolytic capacitors ......................................................................... 43

Annex A (normative) Test voltage....................................................................................... 44

Figure 1 – Destruction test .................................................................................................. 20

Figure 2 – Test apparatus for d.c. conditioning .................................................................... 21

Figure 3 – Test apparatus for a.c. destruction test ............................................................... 21

Figure 4 – Arrangement to produce the variable inductor Lin Figure 3 ................................. 22

Figure 5 – Test apparatus for simlutaneous DC and AC ....................................................... 22

Figure 6 – Test circuit for measurement of capacitance and power factor ............................. 32

Table 1 – Type test schedule .............................................................................................. 13

Table 2 – Test voltages .......................................................................................................14

Table 3 – Torque ................................................................................................................ 16

Table 4 – Minimum creepage distances and clearances ....................................................... 27

Table 5 – Type test schedule .............................................................................................. 30

Table 6 – Test voltages .......................................................................................................31

Table 7 – Torque ................................................................................................................ 34

Table 8 – Minimum creepage distances and clearances ..

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