HT instruments EQUITEST5071 - Manual (Page 26)

EQUITEST 5071
EN - 24
6.4.3. "P-P" mode: measurement procedure and results
1. Select the P-P mode using the F1 key.
2. Insert the 3 Black, Green, Blue connectors of the separate cables into the relevant
instrument input terminals B1, B3, B4.
Fig. 9: Instrument connection for measuring Phase-Phase impedance
3. Insert the alligator clips onto the conductors of the three-phase system (see Fig. 9)
4. When possible, disconnect all loads connected downstreams of the measuring point
since the impedance of these users may alter test results
5. Press the START key. The instrument carries out the test.
CAUTION
 The following test entails the circulation of a maximum current of approx.
12A (400V) between phase and phase. This could cause the tripping of
possible magnetothermal protections with lower tripping currents. In this
case, carry out the measurement upstreams of the protections.
 When message "MEASURING…" is displayed, this indicates that the
instrument is carrying out the test. Never disconnect the instrument’s
leads during this phase.
At the end of the test,
the instrument gives out
a double sound to
indicate that test has
been correctly
performed and the
following screen
appears on the display.
LOOP 30.11.12 Value of Phase-Phase Line
impedance expressed in
Ohm
0.57

701A
FRQ=50.0HZ
VP-P=402V VP-PE=231V
P-P

Value of the assumed Phase-
Phase short-circuit current
calculated using the formula
reported below
Operating mode
FUNC Z2

Formula used for calculating the assumed short-circuit current:
PP
N
CC
Z
U
I

where U
N
= Phase-Phase voltage 127 if V
mis
 150
230 if 150V< V
mis
260
400 if V
mis
> 260
Z
PP
= measured Phase-Phase impedance
3. The results can be saved by pressing the SAVE key twice (see § 7.1).