Section 9
Voltage protection
9.1
Two step undervoltage protection UV2PTUV (27)
9.1.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Two step undervoltage protection
UV2PTUV
3U<
SYMBOL-R-2U-GREATER-THAN
V2 EN
27
9.1.2
Functionality
Undervoltages can occur in the power system during faults or abnormal conditions. Two
step undervoltage protection (UV2PTUV, 27) function can be used to open circuit
breakers to prepare for system restoration at power outages or as long-time delayed back-
up to primary protection.
UV2PTUV (27) has two voltage steps, each with inverse or definite time delay.
UV2PTUV (27) has a high reset ratio to allow settings close to system service voltage.
1MRK 511 365-UUS A
Section 9
Voltage protection
Phasor measurement unit RES670 2.1 ANSI
269
Technical manual
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