ABB REU 523 - Technical Description

10
1MRS 750942-MUM
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
REU 523
4. Technical description
4.1. Functional description
4.1.1. Product functions
4.1.1.1. Schema of product functions
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4.1.1.2. Overvoltage, undervoltage and positive-phase-sequence
Refer to sections:
• 4.1.4.2.“Overvoltage unit”
• 4.1.4.3. “Undervoltage unit”
• 4.1.4.4. “Positive-phase-sequence protection”
59
U12
U23
U31
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47
27
59
27
PO1
PO2
SO1
SO2
IRF
62 BF
D efinite- or inverse-time overvoltage
protection, low-set stage
Definite- or inverse-time undervoltage
protection, low-set stage
Definite- or inverse-time undervoltage
protection, high-set stage
Serial communication
Remote reset, remote setting control or blocking input
for the different protection stages
Circuit-breaker failure protection
Definite- or inverse-time positive-phase-
sequence protection stage
Definite- or inverse-time overvoltage
protection, high-set stage
Optical
pc-interface
Binary input BI