METREL EurotestCOMBO MI 3125 User Manual

MI 3125 / BT EurotestCOMBO Appendix C
82
Keys:
UP / DOWN
Sets Z value.
TEST
Confirms Z value.
Function selectors
Exits back to main function menu.
The impedance limit values for different overcurrent protective devices depend on
nominal voltage and are calculated using the Z factor. Z factor 1.00 is used for nominal
voltage 230 V and Z factor 1.04 is used for nominal voltage 240 V.
Modifications of the chapter 4.2.8
The default setup is listed below:
Instrument setting
Default value
Z factor
1.00
RCD standards
AS/NZS 3017
Modifications of the chapter 5.5
Modified test parameters for fault loop impedance measurement
Fuse type
Selection of fuse type [---, FUSE, B, C, D]
Lim
High limit fault loop impedance value for selected fuse.
See Appendix A.2 for reference fuse data.
Figure 5.25: Examples of loop impedance measurement result
Displayed results:
Z fault loop impedance
Isc ........... prospective fault current,
Lim .......... high limit fault loop impedance value.
Prospective fault current I
PFC
is calculated from measured impedance as follows:
factorscalingZ
U
I
PEL
N
PFC
_


where:
Un Nominal U
L-PE
voltage (see table below),

METREL EurotestCOMBO MI 3125 Specifications

General

Brand	METREL
Model	EurotestCOMBO MI 3125
Category	Measuring Instruments
Language	English