2-22
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS
CHAPTER 2: PRODUCT DESCRIPTION
2
Current supv. pickup:
0.020 to 30.000 pu in steps of 0.001
Current supv. dropout:
97 to 98% of pickup
Current supv. accuracy:
0.1 to 2.0
×
CT rating:
±0.75% of reading or ±2% of rated (whichever is greater)
above 2
×
CT rating:
±2.5% of reading
BREAKER ARCING CURRENT
Principle:
accumulates breaker duty (I
2
t) and measures fault duration
Initiation:
programmable per phase from any FlexLogic operand
Compensation for auxiliary relays:
0 to 65.535 s in steps of 0.001
Alarm threshold:
0 to 50000 kA
2
-cycle in steps of 1
Fault duration accuracy:
0.25 of a power cycle
Availability:
1 per CT bank with a minimum of 2
BREAKER FLASHOVER
Operating quantity:
phase current, voltage, and voltage difference
Pickup level voltage:
0.004 to 1.500 pu in steps of 0.001
Dropout level voltage:
97 to 98% of pickup
Pickup level current:
0.020 to 1.500 pu in steps of 0.001
Dropout level current:
97 to 98% of pickup
Level accuracy:
±0.5% or ±0.1% of rated, whichever is greater
Pickup delay:
0 to 65.535 s in steps of 0.001
Timer accuracy:
±3% of operate time or ±42 ms, whichever is greater
Operate time:
<42 ms at 1.10
×
pickup at 60 Hz
BREAKER RESTRIKE
Principle:
detection of high-frequency overcurrent condition ¼ cycle after breaker opens
Availability:
one per digital signal processor (DSP)
Pickup level:
0.1 to 2.00 pu in steps of 0.01
Reset delay:
0.000 to 65.535 s in steps of 0.001
THERMAL OVERLOAD PROTECTION
Thermal overload curves:
IEC 255-8 curve
Base current:
0.20 to 3.00 pu in steps of 0.01
Overload (k) factor:
1.00 to 1.20 pu in steps of 0.05
Trip time constant:
0 to 1000 min. in steps of 1
Reset time constant:
0 to 1000 min. in steps of 1
Minimum reset time:
0 to 1000 min. in steps of 1
Timer accuracy (cold curve):
±100 ms or 2%, whichever is greater
Timer accuracy (hot curve):
±500 ms or 2%, whichever is greater for I
p
< 0.9 × k × I
b
and I / (k × I
b
) > 1.1
TRIP BUS (TRIP WITHOUT FLEXLOGIC)
Number of elements:
6
Number of inputs:
16
Operate time:
<2 ms at 60 Hz
Timer accuracy:
±3% or 10 ms, whichever is greater
2.5.2 User-programmable elements
FLEXLOGIC
Programming language:
Reverse Polish Notation with graphical visualization (keypad programmable)
Lines of code:
1024
Internal variables:
64
Supported operations:
NOT, XOR, OR (2 to 16 inputs), AND (2 to 16 inputs), NOR (2 to 16 inputs), NAND (2 to 16 inputs),
latch (reset-dominant), edge detectors, timers
Summary of Contents for b30
Page 10: ...x B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TABLE OF CONTENTS ...
Page 486: ...5 278 B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
Page 616: ...iv B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...
Page 632: ...xvi B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL INDEX ...
