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To multiply the per unit value with Phase CT secondary side current, it is possible to get the nominal
secondary current of transformer as Amperes. This current can be used when the unit is
commissioned and the directions of CTs are checked. See an example calculation below:
In case coarse residual current (I01) input is used for CT sum (Holmgren) input then it should be set to
phase current CT ratings 100/5A.
Figure. 5.2.1. - 53. Residual current I01 scaling to summing connection.
For the sensitive residual current (I02) measurement the CT primary and secondary currents are set
directly as rated currents 250/1A.
Figure. 5.2.1. - 54. Residual current I02 scaling to ring core CT input.
CT scaling example (application 2)
The connection of CTs to the IED measurement inputs and the ratings of the current transformers and
transformer nominal current are as in following gure.
AQ-T216
Instruction manual
Version: 2.00
© Arcteq Relays Ltd
48
Содержание AQ 200 Series
Страница 1: ...AQ T216 Transformer protection IED Instruction manual ...
Страница 243: ...Figure 7 1 162 AQ T216 variant with binary input modules AQ T216 Instruction manual Version 2 00 Arcteq Relays Ltd 242 ...
Страница 264: ...Figure 8 11 184 Panel cut out and spacing of the IED AQ T216 Instruction manual Version 2 00 263 Arcteq Relays Ltd ...
Страница 284: ...10 Ordering information AQ T216 Instruction manual Version 2 00 283 Arcteq Relays Ltd ...
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