ABB Industrial IT enabled REX 521 - Application; Hardware versions

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Technical Reference Manual, General
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The REX 521 is designed for protection of incoming and outgoing feeders in
medium voltage distribution substations. Further, the relay can, for example, be
applied to back-up protection of power transformers and back-up for high voltage
line protection relays.
Several standard configurations are available for the protection relay. For more
information, refer to
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(see “References” on page 51).
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Transformers
• Current transformers 1/5 A 4441
• Current transformers 0.2/1 A 1 1 1
• Voltage transformers 100 V 1 4 1
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• Current sensor inputs 3
• Voltage sensor inputs 3
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CPU_SP (SPA/ IEC/MODBUS plastic)
CPU_SG (SPA/ IEC/MODBUS glass)
CPU_LP (SPA/ IEC/ LON/MODBUS plastic)
CPU_LG (SPA/ IEC/ LON/MODBUS glass)
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PS_87H (DItresh.=80 Vdc)
PS_87L (DItresh.=18 Vdc)
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2 x 16 character display
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