ABB REX 521 Technical Reference Manual, Standard Configurations

Also see for REX 521: Operator's manual Technical Reference Manual, General Technical Reference Manual, General Operating guide Technical Reference Manual, Standard Configurations

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ABB REX 521 Technical Reference Manual, Standard Configurations Manual pdf 122 page image

1221MRS 751802-MUMProtection RelayTechnical Reference Manual, Standard ConfigurationsREX 521protection function trip signal can be connected or disconnected. When the three-stage overcurrent (3I> 3I>> and 3I>>>), two-stage earth-fault (Io> and Io>>)protection is selected the checksum for Trip 1 is 31.9.2.3.4. Indication and control connectionsAll the necessary settings for the indication and control signals of the circuit breakerand the disconnector for the incoming feeder can be set as described in the firstapplication example on page 104 onwards for the outgoing feeder (except for theearth-switch). The settings are made by means of the Relay Setting Tool or the localHMI. The settings can be found in:Main menu\Configuration\Input Signals\Main menu\Configuration\Input SWGRP\Main menu\Configuration\Output Signals\Main menu\Configuration\Output SWGRP\.9.2.4. ImplementationsIn the sections below a few implementation examples for the standard configurationB01 are presented.9.2.4.1. Blocking signal received from the outgoing feederThe start signals from the overcurrent protection of the outgoing feeder can beconnected in order to block the overcurrent protection stages on the incoming feeder.There are two input blocking signals, Blocking 1 and Blocking 2, which can havedifferent functions depending on the different protections.The Blocking 1 input signal is connected to the BS1 input and the Blocking 2 inputsignal is connected to the BS2 input of the overcurrent stages 3I>, 3I>> and 3I>>>.The BS1 in this application example will stop the DT or IDTM timer and the BS2will block the trip signal. Please refer to the CD-ROM Technical Descriptions ofFunctions (1MRS 750889-MCD) for more information.In this application example, the digital input DI9 is connected to the input signalBlocking 1 and then routed to the BS1 input of the overcurrent stage 3I>>>. TheBlocking 1 signal can be found in Main menu\Configuration\InputSignals\Blocking 1\ where the DI9 is selected. The checksum for theswitchgroup in Main menu\Configuration\Input SWGRP\Blocking 1\ should be 4 to block 3I>>>.9.2.4.2. Outgoing blocking signal to the overcurrent relay on the HV sideThe start signals from the overcurrent protection function can be routed to an outputrelay to provide a blocking signal. The overcurrent stages 3I>> and 3I>>> have alsoa separate BSOUT signal for blocking purpose.As mentioned above the start signal from the high-set overcurrent stage 3I>> can berouted to the high-set stage 3I>> of the HV relay. To use the start signal of aprotection function, the signal has to be routed viaMain menu\Configuration\Output SWGRP\Start 1 or \Start 2.When the start signal has been routed, the output relay has to be selected inMain menu\Configuration\Output Signals. In this example, the