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L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS
CHAPTER 5: SETTINGS
5
I
n
is the measured overload RMS current at index n
E
n
is the accumulated energy at index n
E
n – 1
is the accumulated energy at index n – 1
The thermal overload protection element removes the
THERMAL PROT 1 OP
output operand when E < 0.05. In case of
emergency, the thermal memory and
THERMAL PROT 1 OP
output operand can be reset using
THERM PROT 1 RESET
setting.
All calculations are performed per phase. If the accumulated energy reaches value 1 in any phase, the thermal overload
protection element operates and only resets when energy is less than 0.05 in all three phases.
Table 5-37: Typical time constants
The figure shows the logic for the thermal overload protection element.
Figure 5-165: Thermal overload protection logic
5.7.10 Pilot schemes
5.7.10.1 Permissive overreaching transfer trip (POTT)
SETTINGS
CONTROL ELEMENTS
PILOT SCHEMES
POTT SCHEME
Protected equipment
Time constant
Minimum reset time
Capacitor bank
10 minutes
30 minutes
Overhead line
10 minutes
20 minutes
Air-core reactor
40 minutes
30 minutes
Busbar
60 minutes
20 minutes
Underground cable
20 to 60 minutes
60 minutes
POTT SCHEME
POTT SCHEME
FUNCTION: Disabled
Range: Disabled, Enabled
POTT PERMISSIVE
ECHO: Disabled
Range: Disabled, Enabled
POTT RX PICKUP
DELAY: 0.000 s
Range: 0.000 to 65.535 s in steps of 0.001
SETTINGS
Enabled = 1
Function
Off = 0
Block
AND
SETTING
IA RMS
Source
IB RMS
IC RMS
SETTINGS
IA > k × Ib
K Factor
IB > k × Ib
IC > k × Ic
Base Current
OR
AND
SETTING
Trip Time Constant
RUN
E > 0.1
SETTINGS
Reset Time Constant
RUN
E < 0.1
Minimum Reset Time
Reset E to 0
SETTING
Off = 0
Reset
Latch
S
R
Reset-dominant
FLEXLOGIC OPERAND
THERMAL PROT 1 OP
FLEXLOGIC OPERAND
THERMAL PROT 1 PKP
827013A1.CDR
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 ...