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400
Series
EN - 3
13.7.
Fault loop impedance measurement ............................................................................... 78
13.7.1.
Purpose of the test ................................................................................................................. 78
13.7.2.
Installation parts to be checked ............................................................................................. 78
13.7.3.
Allowable values .................................................................................................................... 78
13.8.
Earth resistance measurementin TT systems ................................................................. 79
13.8.1.
Purpose of the test ................................................................................................................. 79
13.8.2.
Installation parts to be checked ............................................................................................. 79
13.8.3.
Allowable values .................................................................................................................... 79
13.9.
Voltage and current Harmonics ....................................................................................... 80
13.9.1.
Theory .................................................................................................................................... 80
13.9.2.
Limit values for harmonics ..................................................................................................... 80
13.9.3.
Presence of harmonics: causes ............................................................................................. 81
13.9.4.
Presence of harmonics: consequences ................................................................................. 82
13.10.
Power and Power Factor definition ................................................................................. 82
13.10.1.
Note ........................................................................................................................................ 83
13.10.2.
Conventions on powers and power factors ........................................................................... 83
Содержание 400 Series
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