NOVA AND NOVA PRO
Measurements
41
Figure 5-367: Example of line impedance measurement results
Notes:
Displayed results:
Z ...............
Line impedance,
I
SC.....................
Prospective short-circuit current,
❑
The specified accuracy of the test parameter is valid only if mains voltage is stable
during the measurement.
5.5.1
V%
Voltage drop test
The voltage drop function is a measurement of the line impedance (see chapter 5.5) and
result is compared to a reference result which has been taken before on some other point
of the installation (usually the entry point since this point has the lowest impedance). The
voltage drop in %, the impedance and the prospective short circuit current are shown.
The voltage drop in % is calculated as follows:
∆𝑈
=
(
𝑍
− 𝑍
𝑅𝐸𝐹
) ×
𝐼
𝑁
𝑈
𝑁
How to perform voltage drop measurement
Step 1
Select the
LINE IMPEDANCE
function with the function selector FCT key and
select Voltage drop with the
▲▼ and ◀▶navigation
keys. Then select desired
Type
,
Time
and
Curr
option values with the
▲▼
and
◀▶navigation
keys. The
following menu is displayed:
