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GE UR Series Instruction Manual Page 186

Line differential relay.
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5.5 GROUPED ELEMENTS
b) NEGATIVE SEQUENCE IOC1 / IOC2 (NEGATIVE SEQUENCE INSTANTANEOUS O/C: ANSI 50_2)
Ø
PATH: SETTINGS
GROUPED ELEMENTS
NEG SEQ IOC1
The Negative Sequence Instantaneous Overcurrent element may be used as an instantaneous function with no intentional
delay or as a Definite Time function. The element responds to the negative-sequence current fundamental frequency pha-
5
sor magnitude (calculated from the phase currents) and applies a "positive-sequence" restraint for better performance: a
small portion (12.5%) of the positive-sequence current magnitude is subtracted from the negative-sequence current magni-
tude when forming the operating quantity:
I
I_2
K I_1
=
op
The positive-sequence restraint allows for more sensitive settings by counterbalancing spurious negative-sequence cur-
rents resulting from:
system unbalances under heavy load conditions
transformation errors of current transformers (CTs) during three-phase faults
fault inception and switch-off transients during three-phase faults
The positive-sequence restraint must be considered when testing for pickup accuracy and response time (multiple of
pickup). The operating quantity depends on the way the test currents are injected into the relay (single phase injection:
I
0.2917 I
=
op
injected
SETTING
NEG SEQ IOC1 FUNCTION:
Disabled=0
Enabled=1
SETTING
NEG SEQ IOC1 BLOCK:
Off=0
SETTING
NEG SEQ IOC1 SOURCE:
I_2
5-102
Ö
SETTING GROUP 1(8)
NEG SEQ IOC1
FUNCTION: Disabled
NEG SEQ IOC1 SIGNAL
MESSAGE
SOURCE: SRC 1
NEG SEQ IOC1
MESSAGE
PICKUP: 1.000 pu
NEG SEQ IOC1 PICKUP
MESSAGE
DELAY:
NEG SEQ IOC1 RESET
MESSAGE
DELAY:
NEG SEQ IOC1 BLOCK:
MESSAGE
Off
NEG SEQ IOC1
MESSAGE
TARGET: Self-reset
NEG SEQ IOC1
MESSAGE
EVENTS: Disabled
, where K = 1/8.
; three phase injection, opposite rotation:
SETTING
NEG SEQ IOC1 PICKUP:
RUN
AND
I
_2 - K _1
I
PICKUP
Figure 5–49: NEGATIVE SEQUENCE IOC1 SCHEME LOGIC
L90 Line Differential Relay
ÖØ
NEGATIVE SEQUENCE CURRENT
Range: Disabled, Enabled
Range: SRC 1, SRC 2,..., SRC 6
Range: 0.000 to 30.000 pu in steps of 0.001
Range: 0.00 to 600.00 s in steps of 0.01
0.00 s
Range: 0.00 to 600.00 s in steps of 0.01
0.00 s
Range: FlexLogic™ operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
I
I
=
).
op
injected
SETTING
NEG SEQ IOC1
PICKUP DELAY:
NEG SEQ IOC1
RESET DELAY:
t
PKP
t
5 SETTINGS
ÖØ
NEG SEQ OC1
FLEXLOGIC OPERANDS
NEG SEQ IOC1 PKP
NEG SEQ IOC1 DPO
NEG SEQ IOC1 OP
RST
GE Power Management
827058A5.CDR

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L90

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