GE B30 UR Series, Инструкция по эксплуатации

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5-150 B30 Bus Differential System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
In this scheme, the normal voltage level halts the differential element. An actual bus fault operates the undervoltage ele-
ment, thereby permitting the differential element to operate. This can be applied for bus configurations of up to five feeders
with the voltage signal available. If applied, use the undervoltage function to supervise the main differential output with an
AND gate in the FlexLogic equation before driving the output contact.
Using the drop-out undervoltage operand as the Block input to the differential element is not recommended. The differential
element includes the saturation detector that responds to certain time relationships between the differential and restraining
currents, and therefore, it must be operational all the time in order to function properly.
This element may be used to give a desired time-delay operating characteristic versus the applied fundamental voltage
(phase-to-ground or phase-to-phase for wye VT connection, or phase-to-phase for delta VT connection) or as a definite
time element. The element resets instantaneously if the applied voltage exceeds the dropout voltage. The delay setting
selects the minimum operating time of the phase undervoltage. The minimum voltage setting selects the operating voltage
below which the element is blocked (a setting of “0” will allow a dead source to be considered a fault condition).
Figure 5–63: PHASE UNDERVOLTAGE1 SCHEME LOGIC
PHASE UV1
FUNCTION:
PHASE UV1
BLOCK:
PHASE UV1 SOURCE:
PHASE UV1 MODE:
PHASE UV1
PICKUP:
PHASE UV1
CURVE:
PHASE UV1
DELAY:
PHASE UV1
MINIMUM VOLTAGE:
Disabled = 0
Off = 0
Source VT = Delta
Phase to Ground Phase to Phase
RUN
RUN
VCG or VCA PICKUP
VBG or VBC PICKUP
VAG or VAB Minimum
VBG or VBC Minimum
VCG or VCA Minimum
Source VT = Wye
VAG VAB
VBG VBC
VCG VCA
Enabled = 1
VAB
VBC
VCA
PHASE UV1 A PKP
PHASE UV1 B PKP
PHASE UV1 C PKP
PHASE UV1 PKP
PHASE UV1 A DPO
PHASE UV1 B DPO
PHASE UV1 C DPO
PHASE UV1 A OP
PHASE UV1 B OP
PHASE UV1 C OP
PHASE UV1 OP
AND
SETTING
SETTING
SETTING
SETTING
SETTING
SETTING
FLEXLOGIC OPERANDS
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
827039AB.CDR
AND
AND
AND
OR
OR
<
<
<
<
<
}
t
V
t
t
V
V
VAG or VAB PICKUP
<
RUN
PHASE UV1 DPO
FLEXLOGIC OPERAND
AND