2-20
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS
CHAPTER 2: PRODUCT DESCRIPTION
2
2.5.1 Protection elements
The operating times include the activation time of a trip rated form-A output contact unless otherwise indicated. FlexLogic
operands of a given element are 4 ms faster. Take this into account when using FlexLogic to interconnect with other
protection or control elements of the relay, building FlexLogic equations, or interfacing with other intelligent electronic
devices (IEDs) or power system devices via communications or different output contacts. If not specified, the operate times
given here are for a 60 Hz system at nominal system frequency. Operate times for a 50 Hz system are 1.2 times longer.
BUS DIFFERENTIAL (87B)
Pickup level:
0.050 to 6.000 pu in steps of 0.001
Low slope:
15 to 100% in steps of 1
High slope:
50 to 100% in steps of 1
Low breakpoint:
1.00 to 30.00 pu in steps of 0.01
High breakpoint:
1.00 to 30.00 pu in steps of 0.01
High set level:
0.10 to 99.99 pu in steps of 0.01
Dropout level:
97 to 98% of pickup
Level accuracy:
0.1 to 2.0
×
CT rating:
±0.5% of reading or ±1% of rated (whichever is greater) for six circuits or less in the zone
>2.0
×
CT rating
±1.5% of reading of the maximum circuit current
Operating time:
one power system cycle (typical)
Number of zones:
2
CT TROUBLE
Responding to:
Differential current
Pickup level:
0.020 to 2.000 pu in steps of 0.001
Pickup delay:
1.0 to 60.0 sec. in steps of 0.1
PHASE/NEUTRAL/GROUND TOC
Current:
Phasor or RMS
Pickup level:
0.020 to 30.000 pu in steps of 0.001
Dropout level:
97% to 98% of pickup
Level accuracy:
0.1 to 2.0
×
CT:
±0.5% of reading or ±0.4% of rated (whichever is greater)
> 2.0
×
CT:
±1.5% of reading > 2.0
×
CT rating
Curve shapes:
IEEE Moderately/Very/Extremely Inverse; IEC (and BS) A/B/C and Short Inverse; GE IAC Inverse,
Short/Very/ Extremely Inverse; I
2
t; FlexCurves™ (programmable); Definite Time (0.01 s base
curve)
Curve multiplier:
Time Dial = 0.00 to 600.00 in steps of 0.01
Reset type:
Instantaneous/Timed (per IEEE)
Curve timing accuracy at 1.03 to 20 x pickup:
±3.5% of operate time or ±½ cycle (whichever is greater) from pickup to operate
Voltage restraint:
Modifies pickup current for voltage in the range of 0.1 < V < 0.9 VT Nominal in a fixed linear rela-
tionship
PHASE/NEUTRAL/GROUND IOC
Current:
Phasor only
Pickup level:
0.020 to 30.000 pu in steps of 0.001
Dropout level:
97 to 98% of pickup
Level accuracy:
0.1 to 2.0
×
CT rating:
±0.5% of reading or ±0.4% of rated (whichever is greater)
> 2.0
×
CT rating:
±1.5% of reading
Overreach:
<2%
Pickup delay:
0.00 to 600.00 s in steps of 0.01
Reset delay:
0.00 to 600.00 s in steps of 0.01
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 ...