5-106
B90 Low Impedance Bus Differential System
GE Multilin
5.5 GROUPED ELEMENTS
5 SETTINGS
5
5.5.5 VOLTAGE ELEMENTS
a) MAIN MENU
PATH: SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
VOLTAGE ELEMENTS
b) UNDERVOLTAGE
(ANSI 27)
PATH: SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
VOLTAGE ELEMENTS
UNDERVOLTAGE 1(12)
The undervoltage element supervises (low-voltage check) current based main protection (that is, differential, breaker fail-
ure, end fault, and time overcurrent backup protection). The B90 accepts phase-to-ground or phase-to-phase voltage input
configurations. If the intention is to operate all three phases for any one phase voltage collapse, appropriate FlexLogic™
operand exchanges must occur between the B90s using fiber optic communications (direct inputs and outputs).
The undervoltage element also accepts the neutral voltage (3V0) from an open-corner delta VT arrangement. In this case,
the FlexLogic™ output is inverted to accomplish the 3V0 overvoltage functionality.
Application of the Undervoltage element is beneficial during CT trouble conditions. A low-voltage check prevents malopera-
tion of the main protection until the CT trouble element (differential current alarm) operates. The CT Trouble element is
user-configurable to block selected protection functions indefinitely. Voltage supervision alone does not guarantee security
because a CT trouble may be followed by an external fault causing a low-voltage condition.
Voltage pickup is set in per-unit values. The nominal voltage as entered in the
SYSTEM SETUP
AC INPUTS
VOLTAGE
BANK ##
VT ## SECONDARY
setting corresponds to 1 pu. The minimum voltage setting (
UNDERVOLTAGE 1 MIN VOLTAGE
)
specifies the minimum voltage required for element operation. This setting discriminates between undervoltage conditions
for energized and de-energized circuits. If the element is used for low-voltage supervision, set this value to zero.
VOLTAGE ELEMENTS
UNDERVOLTAGE 1
See below.
MESSAGE
UNDERVOLTAGE 2
See below.
MESSAGE
UNDERVOLTAGE 12
See below.
UNDERVOLTAGE 1
UNDERVOLTAGE 1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
UNDERVOLTAGE 1
VT: F5
Range: Available voltage channels
MESSAGE
UNDERVOLTAGE 1
PICKUP: 0.800 pu
Range: 0.000 to 3.000 pu in steps of 0.001
MESSAGE
UNDERVOLTAGE 1 MIN
VOLTAGE: 0.000 pu
Range: 0.000 to 1.000 pu in steps of 0.001
MESSAGE
UNDERVOLTAGE 1 PKP
DELAY: 0.000 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
UNDERVOLTAGE 1 RST
DELAY: 0.000 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
UNDERVOLTAGE 1 BLK:
Off
Range: FlexLogic™ operand
MESSAGE
UNDERVOLTAGE 1
TARGET: Self-Reset
Range: Self-Reset, Latched, Disabled
MESSAGE
UNDERVOLTAGE 1
EVENTS: Disabled
Range: Enabled, Disabled
Содержание B90 UR Series
Страница 28: ...1 20 B90 Low Impedance Bus Differential System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Страница 114: ...4 28 B90 Low Impedance Bus Differential System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Страница 272: ...6 14 B90 Low Impedance Bus Differential System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Страница 316: ...A 4 B90 Low Impedance Bus Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Страница 406: ...B 90 B90 Low Impedance Bus Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Страница 436: ...C 30 B90 Low Impedance Bus Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Страница 446: ...D 10 B90 Low Impedance Bus Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...