VR2250
Page 4 of 131
14.
TECHNICAL SPECIFICATIONS ...............................................................................................................100
14.1.
Technical Features .................................................................................................................................................. 100
14.1.1.
Safety Test functions .....................................................................................................................................................100
14.1.2.
ANALYSER and AUX functions .....................................................................................................................................102
14.2.
Standards ................................................................................................................................................................ 103
14.2.1.
General ..........................................................................................................................................................................103
14.2.2.
Safety Test .....................................................................................................................................................................103
14.2.3.
ANALYSER………………………………………………………………………………………………………………………..110
14.2.4.
AUX ...............................................................................................................................................................................103
14.3.
General Specifications ............................................................................................................................................ 104
14.3.1.
Mechanical Data ............................................................................................................................................................104
14.3.2.
Power supply .................................................................................................................................................................104
14.3.3.
Display ...........................................................................................................................................................................104
14.3.4.
Memory ..........................................................................................................................................................................104
14.4.
ENVIRONMENT ...................................................................................................................................................... 104
14.5.
ACCESSORIES ...................................................................................................................................................... 105
15.
SERVICE ...................................................................................................................................................106
15.1.
WARRANTY CONDITIONS .................................................................................................................................... 106
15.2.
SERVICE ................................................................................................................................................................. 106
16.
PRACTICAL REPORTS FOR ELECTRICAL TESTS ...............................................................................107
16.1.
Continuity Test On Protective Conductors ............................................................................................................. 107
16.2.
Insulation Resistance Measurement of the Electrical Installations (250Vdc, 500Vdc, 1000Vdc) ......................... 108
16.3.
Check of the Circuit Separation .............................................................................................................................. 112
16.4.
Earth Resistance Measurement in TT Systems ..................................................................................................... 115
16.5.
Working Test of RCDs (Rcd, Rcd/Dc, Rcd S, Rcd/Dc S) ....................................................................................... 116
16.6.
Test of RCD Tripping Time (Rcd, Rcd/Dc) ............................................................................................................. 117
16.7.
Measurement of Short-Circuit Fault Impedance (Z
pn
, Z
pp
) ...................................................................................... 118
16.8.
Fault Loop Impedance Measurement (Phase – Earth) .......................................................................................... 118
16.9.
Earth Resistivity Measurement ............................................................................................................................... 119
16.10.
Voltage Anomalies (Voltage S and Surge) .................................................................................................... 121
16.11.
Voltage and current Harmonics ...................................................................................................................... 121
16.11.1.
Theory ..................................................................................................................................................................121
16.11.2.
Limit values for harmonics ...................................................................................................................................123
16.11.3.
Presence of harmonics: causes ...........................................................................................................................123
16.11.4.
Presence of harmonics: consequences ...............................................................................................................124
16.12.
Power and Power Factor definition ................................................................................................................ 124
16.12.1.
Conventions on powers and power factors ..........................................................................................................126
16.12.2.
3 Phase 3 Wire System .......................................................................................................................................127
16.13.
Measuring Method: outlines ........................................................................................................................... 128
16.13.1.
Integration periods ...............................................................................................................................................128
16.13.2.
Power factor calculations .....................................................................................................................................128
17.
APPENDIX 1 – MESSAGES DISPLAYED ................................................................................................129
18.
APPENDIX 2 – RECORDABLE PARAMETERS: SYMBOLS ...................................................................130
