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:
• 4.1.4.2."Overvoltage unit"
• 4.1.4.3. "Undervoltage unit"
• 4.1.4.4. "Positive-phase-sequence protection"
PO1
59
PO2
59
SO1
SO2
27
IRF
27
47
62 BF
Optical
pc-interface
1MRS 750942-MUM