Current transformer selection guideline

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• AQ-200 Current transformer selection

  Introduction Current transformer selection is important part of complete protection system design. Current transformer must be able to measure currents according to the application needs in all situations. Specifying current transformers is sometimes ...

• Technical difference between AQ-200 IED residual current channels Io1 and Io2

  Every AQ-200 series IED equipped with current transformer module has two residual current channels Io1 and Io2. All protection and control functions that use residual current require the user to choose which of these two residual current channels is ...

• AQ 2xx Relay Output Guideline

  RELAY OUTPUTS IN GENERAL Generally, protection relay outputs can be used for many different things. Most important usage for outputs in protection relay is clearly controlling the circuit breaker opening and closing coils. This can be done either ...

• 3-phase, 3-wire ARON input connection example

  This chapter presents a connection example of an application with protection current transformers for just two phases. Connection is suitable for both motor –and feeder protection applications. ARON input connection can measure load symmetrically ...

• Setting thermal capacity manually when testing line/machine/transformer thermal overload protection

  When testing thermal overload protection functions resetting the thermal capacity it often needed so that the test can be repeated multiple times without having to wait for the thermal cap to got down. This can be done with parameter Cold reset theta ...