Figure. 5.2.2 - 14. Connections.
The following table presents the initial data of the connection.
Table. 5.2.2 - 23. Initial data.
PPha
hase v
se volta
oltage V
ge VTT
- VT primary: 20 000 V
- VT secondary: 100 V
ZZer
ero sequence v
o sequence volta
oltage V
ge VTT
- U4 VT primary: 20 000 V
- U4 VT secondary: 100 V
- the zero sequence voltage is connected similarly to line-to-neutral voltages (+U0).
- in case wiring is incorrect, all polarities can be individually switched by 180 degrees in the relay.
If the protection is voltage-based, the supervised voltage can be based either on line-to-line voltages or
on line-to-earth voltages. This selection is defined in the "Measured magnitude" of each protection
stage menu separately (
Protection
→
Voltage
→
[protection stage menu]
→
INFO; see the image
below). The number of available protection functions depends on the relay type.
Figure. 5.2.2 - 15. Selecting the measured magnitude.
A
AQ
Q-M255
-M255
Instruction manual
Version: 2.06
32
© Arcteq Relays Ltd
IM00020
Summary of Contents for AQ-M255
Page 1: ...AQ M255 Motor protection IED Instruction manual...
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