IG-267-EN versión 01; 07/04/2017
50
Sensors General Instructions
ekor.rpa
6.1.2. Vector sum/zero-sequence wiring
The transformers described above can be connected in
two ways, depending on whether a zero-sequence toroidal
current transformer is used or not.
Figure 6.3. Detection of earth current by vector sum Figure 6.4. Detection of earth current with zero-sequence transformer
Zero-sequence current toroidal transformers
Ratio
300/1 A 1000/1 A
Metering range
Extd. 130 % Extd. 130 %
Protection
5P10 5P10
Metering
Class 3 Class 3
Burden
0.2 VA 0.2 VA
Thermal current
31.5 kA – 3 s 31.5 kA – 3 s
Dynamic current
2.6 I
th
2.6 I
th
Frequency
50 – 60 Hz 50 – 60 Hz
Insulation
0.72/3 kV 0.72/3 kV
External dimensions
330 x 105 mm 330 x 105 mm
Internal dimensions
272 x 50 mm 272 x 50 mm
Height
41 mm 41 mm
Weight
0.98 kg 0.98 kg
Polarity
S1 – blue, S2 – brown S1–blue, S2–brown
Encapsulated
Self-extinguishing polyurethane Self-extinguishing polyurethane
Thermal class
B (130 °C) B (130 °C)
Reference standard
IEC 60044-1 IEC 60044-1
Table 6.3. Zero-sequence current transformers
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