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ABB Substation Automation
Products and Systems
2.
2.1.
2.1.1.
2.1.1.1.
2.1.1.2.
1MRS750886-MUM
User's Guide
Technical description
Functional description
Product functions
Schema of product functions
U12
DEFINITE- OR INVERSE-TIME OVERVOLTAGE
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
CIRCUIT-BREAKER FAILURE
PROTECTION
BINARY INPUT BI
REMOTE RESET, REMOTE SETTING CONTROL OR
BLOCKING INPUT FOR THE DIFFERENT PROTECTION
STAGES
SERIAL COMMUNICATION
Fig. 2.1.1.1.-1 Product functions
Overvoltage, undervoltage and positive-phase-sequence
Refer to sections:
• 2.1.3.2. Overvoltage unit
• 2.1.3.3. Undervoltage unit
• 2.1.3.4. Positive-phase-sequence protection
PO1
59
PO2
59
SO1
SO2
27
IRF
27
47
62 BF
OPTICAL
PC-INTERFACE
REU 513
13
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