Technical Description; Functional Description; Product Functions; Schema Of Product Functions - ABB REU 523 Technical Reference Manual

REU 523
4.
4.1.
4.1.1.
4.1.1.1.
4.1.1.2.
10
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual

Technical Description

Functional description

Product functions

Schema of product functions

U12
efinite- or inverse-time overvoltage
D
protection, low-set stage
U23
Definite- or inverse-time overvoltage
protection, high-set stage
U31
Definite- or inverse-time undervoltage
protection, low-set stage
Definite- or inverse-time undervoltage
protection, high-set stage
Definite- or inverse-time positive-phase-
sequence protection stage
Circuit-breaker failure protection
Remote reset, remote setting control or blocking input
Binary input BI
for the different protection stages
Serial communication
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Overvoltage, undervoltage and positive-phase-sequence

Refer to sections:
• 4.1.3.2. Overvoltage unit
• 4.1.3.3. Undervoltage unit
• 4.1.3.4. Positive-phase-sequence protection
PO1
59
PO2
59
SO1
SO2
27
IRF
27
47
62 BF
Optical
pc-interface
1MRS 750942-MUM
ABB Automation