MI 3152(H)
Eurotest
XC (2,5 kV)
Tests and measurements
102
Start the measurement using
or
button.
Save results (optional).
Figure 7.43: Examples of high precision Line impedance measurement result
Measurement results / sub-results
Z
Line impedance
Ipsc
Standard prospective short-circuit current
Imax
Maximal prospective short-circuit current
Imin
Minimal prospective short-circuit current
Imax2p
Maximal two-phases prospective short-circuit current
Imin2p
Minimal two-phases prospective short-circuit current
Imax3p
Maximal three-phases prospective short-circuit current
Imin3p
Minimal three-phases prospective short-circuit current
R
Resistance of line impedance
XL
Reactance of line impedance
Uln
Voltage L-N or L-L
Freq
Frequency
Standard prospective short-circuit current I
PSC
is calculated as follows:
𝐼
𝑃𝑆𝐶
=
230 𝑉
𝑍
where
𝑈
𝐿−𝑁
= 230 𝑉 ± 10 %
𝐼
𝑃𝑆𝐶
=
400 𝑉
𝑍
where
𝑈
𝐿−𝐿
= 400 𝑉 ± 10 %
The prospective short-circuit currents I
Min
, I
Min2p
, I
Min3p
and I
Max
, I
Max2p
, I
Max3p
are calculated as
follows:
𝐼
𝑀𝑖𝑛
=
𝐶
𝑚𝑖𝑛
𝑈
𝑁(𝐿−𝑁)
𝑍
(𝐿−𝑁)ℎ𝑜𝑡
where
𝑍
(𝐿−𝑁)ℎ𝑜𝑡
= √(1.5 × 𝑅
(𝐿−𝑁)
)
2
+ 𝑋
(𝐿−𝑁)
2
𝐶
𝑚𝑖𝑛
= {
0.95; 𝑈
𝑁(𝐿−𝑁)
= 230 𝑉 ± 10 %
1.00; 𝑜𝑡ℎ𝑒𝑟𝑤𝑖𝑠𝑒
𝐼
𝑀𝑎𝑥
=
𝐶
𝑚𝑎𝑥
𝑈
𝑁(𝐿−𝑁)
𝑍
(𝐿−𝑁)
where
𝑍
(𝐿−𝑁)
= √𝑅
(𝐿−𝑁)
2
+ 𝑋
(𝐿−𝑁)
2
𝐶
𝑚𝑎𝑥
= {
1.05; 𝑈
𝑁(𝐿−𝑁)
= 230 𝑉 ± 10 %
1.10; 𝑜𝑡ℎ𝑒𝑟𝑤𝑖𝑠𝑒
