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CHAPTER 5: SETTINGS
GROUPED ELEMENTS
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
5-221
5
Figure 5-119: Neutral time overcurrent 1 logic
5.6.9.3 Neutral instantaneous overcurrent (ANSI 50N, IEC PIOC)
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
NEUTRAL CURRENT
NEUTRAL IOC1(4)
The neutral instantaneous overcurrent element can be used as an instantaneous function with no intentional delay or as a
definite time function. The element essentially responds to the magnitude of a neutral current fundamental frequency
phasor calculated from the phase currents. A positive-sequence restraint is applied for better performance. A small portion
(6.25%) of the positive-sequence current magnitude is subtracted from the zero-sequence current magnitude when
forming the operating quantity of the element as follows:
Eq. 5-18
The positive-sequence restraint allows for more sensitive settings by counterbalancing spurious zero-sequence currents
resulting from:
•
System unbalances under heavy load conditions
•
Transformation errors of current transformers (CTs) during double-line and three-phase faults
•
Switch-off transients during double-line and 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 how test currents are injected into the relay (single-phase injection:
; three-phase pure zero-sequence injection:
).
NEUTRAL IOC1
NEUTRAL IOC1
FUNCTION: Disabled
Range: Disabled, Enabled
NEUTRAL IOC1 SIGNAL
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
NEUTRAL IOC1
PICKUP: 1.000 pu
Range: 0.000 to 30.000 pu in steps of 0.001
NEUTRAL IOC1 PICKUP
DELAY: 0.00 s
Range: 0.00 to 600.00 s in steps of 0.01
NEUTRAL IOC1 RESET
DELAY: 0.00 s
Range: 0.00 to 600.00 s in steps of 0.01
NEUTRAL IOC1 BLOCK:
Off
Range: FlexLogic operand
NEUTRAL IOC1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
NEUTRAL IOC1
EVENTS: Disabled
Range: Disabled, Enabled
SETTING
NEUTRAL TOC1
FUNCTION:
Enabled = 1
SETTING
NEUTRAL TOC1
SOURCE:
IN
NEUTRAL TOC1
BLOCK:
Off = 0
NEUTRAL TOC1
CURVE:
NEUTRAL TOC1
TD MULTIPLIER:
NEUTRAL TOC 1
RESET:
SETTINGS
SETTING
IN
PICKUP
I
t
NEUTRAL TOC1
PICKUP:
RUN
827034A4.VSD
FLEXLOGIC OPERANDS
NEUTRAL TOC1 DPO
NEUTRAL TOC1 OP
NEUTRAL TOC1
INPUT:
AND
NEUTRAL TOC1 PKP
I
op
3
I_0
K
I_1
×
–
(
)
×
=
where K
1 16
⁄
=
I
op
0.9375 I
injected
×
=
I
op
3 I
injected
×
=
Содержание L60
Страница 130: ...4 30 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL LOGIC DIAGRAMS CHAPTER 4 INTERFACES 4 ...
Страница 464: ...5 334 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
Страница 498: ...7 10 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL TARGETS MENU CHAPTER 7 COMMANDS AND TARGETS 7 ...
Страница 570: ...10 14 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL DISPOSAL CHAPTER 10 MAINTENANCE 10 ...
Страница 582: ...A 12 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL FLEXANALOG ITEMS APPENDIX A FLEXANALOG OPERANDS A ...
Страница 588: ...C 4 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL REVISION HISTORY APPENDIX C MISCELLANEOUS C ...
Страница 592: ...iv L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...