WAGO-I/O-SYSTEM 750 XTR
Appendix 303
750-495/040-00x 3-Phase Power Measurement Module 690 V
Manual
Version 1.2.0
12.4.1 Calculation of the NoLoad Limit for User-Defined
Rogowski Coils
The NoLoad limit is calculated from the product of the full-scale RMS values for
current and voltage.
For all versions of the 750-495 I/O module, the full-scale RMS value of the
voltage is 505.228 V
RMS
.
The full-scale RMS value is calculated from the peak value for current, which
follows from the user-defined settings for mutual inductance M and internal
resistance R
RC
.
Calculation of the NoLoad limit for power (W, VA, VAR):
𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑃𝑃𝑁𝑁
𝑁𝑁𝑃𝑃𝑃𝑃𝑃𝑃𝐶𝐶
= 505.228
𝑉𝑉
𝑅𝑅𝑀𝑀𝑅𝑅
×
0.5
𝑉𝑉
8 ×
𝜋𝜋
×
𝑓𝑓
𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁𝑁
×
𝑀𝑀
𝑅𝑅𝑅𝑅
×
22
𝑘𝑘Ω
22
𝑘𝑘Ω
+
𝑅𝑅
𝑅𝑅𝑅𝑅
×
1
√
2
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