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Basis—Time-current characteristic (TCC) curves for the S&C Vista Overcurrent Control 2.0 are shown in this publication. These curves are plotted for a system frequency of 60 Hz, and for a Vista or Vista SD CT ratio of 660:1. Except for the K-speed curve family, all TCC curves were developed using the following equation:
Where:
t is the minimum tripping time for Vista Coordination and Vista Speed curves, and the average tripping time for IEEE and IEC curves, in seconds;
A, B, C, and p coefficients are provided later for each time-current characteristic curve;
Irms is the nominal power frequency (fundamental) current in amperes, measured by the Vista Overcurrent Control 2.0;
Imin- p i ckup i s the min imum power f requency (fundamental) pickup current, in amperes, at which the TCC curve begins timing;
TM is the time multiplier (time dial); and,
TA is the time adder.
The K-speed curve family was developed using discrete data points. These data points can be found in the Time-Current Characteristic Curves section of sandc.com.
Vista Overcurrent Control 2.0 TCC curves are applicable to both 50- and 60-Hz systems. They are also applicable over the Vista or Vista SD switchgear’s entire operating temperature range of -40°F (-40°C) to +104°F (+40°C). No adjustments must be made to these curves for ambient temperature within this temperature range.
Tolerances—Tolerances for each TCC curve family are listed on the first page of each curve family. The interrupting time is 29 milliseconds. The total minimum clearing time—from initiation of the fault to total clearing—is 43 milliseconds.
Power-Up Current—With a CT ratio of 660:1, the S&C Vista Overcurrent Control 2.0 requires a minimum current level of 14 amperes in each phase or 42 amperes in a single phase to power up and trip.
With a CT ratio of 1320:1, the S&C Vista Overcurrent Control 2.0 requires a minimum current level of 28 amperes in each phase or 84 amperes in a single phase to power up and trip.
Application—The maximum continuous current-carrying capability of S&C Vista Underground Distribution Switchgear is 900 amperes, and the maximum continuous current-carrying capability of S&C Vista SD Underground Distribution Switchgear is 630 amperes. The S&C Vista Overcurrent Control 2.0 is capable of sensing current in the range of 14-25,000 amperes RMS.
Because the time-current characteristics in this docu-ment are electronically derived, they are not subject to change due to aging, transient overcurrents, or fault currents. It is, therefore, only necessary to reset the fault interrupters following a fault-clearing operation.
t(Irms) =A
+B•TM+TAIrms
Imin–pickup
p– C
October 22, 2018
© S&C Electric Company 2018, all rights reserved Information Bulletin 680-211
S&C Vista® Underground Distribution Switchgear and Vista® SD Underground Distribution SwitchgearOutdoor Distribution (15.5 kV through 38 kV)
Table of Contents
Section Page
Base TCC Curves
Vista Coordination Curves . . . . . . . . . . . . . . . . . 2Tap Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Main Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Vista Speed Curves . . . . . . . . . . . . . . . . . . . . . . . 36
E-Speed Curves . . . . . . . . . . . . . . . . . . . . . . . . . 37
K-Speed Curves . . . . . . . . . . . . . . . . . . . . . . . . . 56
T-Speed Curves . . . . . . . . . . . . . . . . . . . . . . . . . 72
IEEE Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
IEC Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Section Page
Time-Current Characteristic Curves
2 S&C Information Bulletin 680-211
Category Setting Current Above 30 A① Current at or Below 30 A①
Time Overcurrent Response Minimum Trip Time The greatest of minimum tripping curve or 8 ms
Maximum Trip Time Maximum trip time is the greatest of minimum tripping curve:
• -10% expressed in terms of primary current
• +20% expressed in terms of time
• +6 ms (60-Hz systems) or +10 ms (50-Hz systems)
• +16 ms (60-Hz systems) or +20 ms (50-Hz systems) for currents from 1-2 times the current corresponding to a 10-ms trip time
• +14 ms for currents greater than 2 times the current corresponding to a 10-ms trip time
Maximum trip time is the greatest of minimum tripping curve:
• -3 A expressed in terms of primary current ●
• +20% expressed in terms of time
• +6 ms (60-Hz systems) or +10 ms (50-Hz systems)
• +16 ms (60-Hz systems) or +20 ms (50-Hz systems) for currents from 1-2 times the current corresponding to a 10-ms trip time
• +14 ms for currents greater than 2 times the current corresponding to a 10-ms trip time
Timing starts if Primary current -10% is equal to or greater than the minimum trip current, or low-current cutoff if enabled
Primary current -3 A is equal to or greater than the minimum trip current, or low-current cutoff if enabled ●
Timing does not start if primary current is less than the minimum trip current or low-current cutoff, if enabled
Definite Time Minimum Trip Time 8-ms minimum trip
Maximum Trip Time The greatest of definite time setting times 1 .03, or setting plus +16 ms (60-Hz systems) or +20 ms (50-Hz systems)
Timing starts if Primary current -10% is equal to or greater than definite time current setting
Primary current -3 A is equal to or greater than the definite time current setting ●
Timing does not start if primary current is less than the minimum trip current or low-current cutoff, if enabled
Base TCC Curves—Vista Coordination Curves
Vista Coordination CurvesParameters for Vista Coordination curves generate the minimum tripping TCC curve. Tolerances for these curves are detailed in Table 1, and parameters for each TCC curve are shown below the corresponding graph.
Table 1. Vista Coordination Curve Tolerances
① With a CT ratio of 660:1, this value is 30 A . With a CT ratio of 1320:1, this value is 60 A .
● With a CT ratio of 660:1, tolerance is -3 A . With a CT ratio of 1320:1, tolerance is -6 A .
S&C Information Bulletin 680-211 3
Base TCC Curves—Vista Coordination Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
15-AmpereTapTCCCurve
15AMinimumTrip
15ATotalClear
Tap Curves
Curve Parameter
A B p C Min. Pickup (Amperes)
15-Ampere Tap 2 0 .007 1 .9 1 15
4 S&C Information Bulletin 680-211
Base TCC Curves—Vista Coordination Curves
Curve Parameter
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
20-AmpereTapTCCCurve
20AMinimumTrip
20ATotalClear
Tap Curves
A B p C Min. Pickup (Amperes)
20-Ampere Tap 2 0 .007 1 .9 1 20
S&C Information Bulletin 680-211 5
Base TCC Curves—Vista Coordination Curves
Tap Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
25-AmpereTapTCCCurve
25AMinimumTrip
25ATotalClear
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
25-Ampere Tap 2 0 .007 1 .9 1 25
6 S&C Information Bulletin 680-211
TCC Curve Parameter
Base TCC Curves—Vista Coordination Curves
Tap Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
30-AmpereTapTCCCurve
30AMinimumTrip
30ATotalClear
A B p C Min. Pickup (Amperes)
30-Ampere Tap 2 0 .007 1 .9 1 30
S&C Information Bulletin 680-211 7
TCC Curve Parameter
Base TCC Curves—Vista Coordination Curves
Tap Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
40-AmpereTapTCCCurve
40AMinimumTrip
40ATotalClear
A B p C Min. Pickup (Amperes)
40-Ampere Tap 2 0 .007 1 .9 1 40
8 S&C Information Bulletin 680-211
Base TCC Curves—Vista Coordination Curves
Tap Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
50-AmpereTapTCCCurve
50AMinimumTrip
50ATotalClear
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
50-Ampere Tap 2 0 .007 1 .9 1 50
S&C Information Bulletin 680-211 9
Base TCC Curves—Vista Coordination Curves
Tap Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
65-AmpereTapTCCCurve
65AMinimumTrip
65ATotalClear
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
65-Ampere Tap 2 0 .007 1 .9 1 65
10 S&C Information Bulletin 680-211
Base TCC Curves—Vista Coordination Curves
Tap Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
80-AmpereTapTCCCurve
80AMinimumTrip
80ATotalClear
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
80-Ampere Tap 2 0 .007 1 .9 1 80
S&C Information Bulletin 680-211 11
Base TCC Curves—Vista Coordination Curves
Tap Curves
TCC Curve Parameter
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
100-AmpereTapTCCCurve
100AMinimumTrip
100ATotalClear
A B p C Min. Pickup (Amperes)
100-Ampere Tap 2 0 .007 1 .9 1 100
12 S&C Information Bulletin 680-211
Tap Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
150-Ampere Tap 2 0 .007 1 .9 1 150
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
150-AmpereTapTCCCurve
150AMinimumTrip
150ATotalClear
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 13
Tap Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
200-Ampere Tap 2 0 .007 1 .9 1 200
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
200-AmpereTapTCCCurve
200AMinimumTrip
200ATotalClear
Base TCC Curves—Vista Coordination Curves
14 S&C Information Bulletin 680-211
Tap Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
250-Ampere Tap 2 0 .007 1 .9 1 250
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
250-AmpereTapTCCCurve
250AMinimumTrip
250ATotalClear
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 15
Tap Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
300-Ampere Tap 2 0 .007 1 .9 1 300
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
300-AmpereTapTCCCurve
300AMinimumTrip
300ATotalClear
Base TCC Curves—Vista Coordination Curves
16 S&C Information Bulletin 680-211
Tap Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
350-Ampere Tap 2 0 .007 1 .9 1 350
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
350-AmpereTapTCCCurve
350AMinimumTrip
350ATotalClear
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 17
Tap Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
400-Ampere Tap 2 0 .007 1 .9 1 400
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
400-AmpereTapTCCCurve
400AMinimumTrip
400ATotalClear
Base TCC Curves—Vista Coordination Curves
18 S&C Information Bulletin 680-211
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
25-Ampere Main 2 0 .045 2 1 25
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
25-AmpereMainTCCCurve
25AMainMinimumTrip
25AMainTotalClear
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 19
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
30-Ampere Main 2 0 .045 2 1 30
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
30-AmpereMainTCCCurve
30AMainMinimumTrip
30AMainTotalClear
Base TCC Curves—Vista Coordination Curves
20 S&C Information Bulletin 680-211
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
40-Ampere Main 2 0 .045 2 1 40
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
40-AmpereMainTCCCurve
40AMainMinimumTrip
40AMainTotalClear
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 21
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
50-Ampere Main 2 0 .045 2 1 50
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
50-AmpereMainTCCCurve
50AMainMinimumTrip
50AMainTotalClear
Base TCC Curves—Vista Coordination Curves
22 S&C Information Bulletin 680-211
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
65-Ampere Main 2 0 .045 2 1 65
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
65-AmpereMainTCCCurve
65AMainMinimumTrip
65AMainTotalClear
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 23
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
80-Ampere Main 2 0 .045 2 1 80
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
80-AmpereMainTCCCurve
80AMainMinimumTrip
80AMainTotalClear
Base TCC Curves—Vista Coordination Curves
24 S&C Information Bulletin 680-211
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
100-Ampere Main 2 0 .045 2 1 100
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
100-AmpereMainTCCCurve
100AMainMinimumTrip
100AMainTotalClear
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 25
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
150-Ampere Main 2 0 .045 2 1 150
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
150-AmpereMainTCCCurve
150AMainMinimumTrip
150AMainTotalClear
Base TCC Curves—Vista Coordination Curves
26 S&C Information Bulletin 680-211
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
200-Ampere Main 2 0 .045 2 1 200
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
200-AmpereMainTCCCurve
200AMainMinimumTrip
200AMainTotalClear
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 27
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
250-Ampere Main 2 0 .045 2 1 250
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
250-AmpereMainTCCCurve
250AMainMinimumTrip
250AMainTotalClear
Base TCC Curves—Vista Coordination Curves
28 S&C Information Bulletin 680-211
Main Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
300-AmpereMainTCCCurve
300AMainMinimumTrip
300AMainTotalClear
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
300-Ampere Main 2 0 .045 2 1 300
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 29
Main Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
350-AmpereMainTCCCurve
350AMainMinimumTrip
350AMainTotalClear
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
350-Ampere Main 2 0 .045 2 1 350
Base TCC Curves—Vista Coordination Curves
30 S&C Information Bulletin 680-211
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
400-Ampere Main 2 0 .045 2 1 400
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
400-AmpereMainTCCCurve
400AMainMinimumTrip
400AMainTotalClear
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 31
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
450-Ampere Main 2 0 .045 2 1 450
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
450-AmpereMainTCCCurve
450AMainMinimumTrip
450AMainTotalClear
Base TCC Curves—Vista Coordination Curves
32 S&C Information Bulletin 680-211
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
500-Ampere Main 2 0 .045 2 1 500
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
500-AmpereMainTCCCurve
500AMainMinimumTrip
500AMainTotalClear
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 33
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
600-Ampere Main 2 0 .045 2 1 600
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
600-AmpereMainTCCCurve
600AMainMinimumTrip
600AMainTotalClear
Base TCC Curves—Vista Coordination Curves
34 S&C Information Bulletin 680-211
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
700-Ampere Main 2 0 .045 2 1 700
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
700-AmpereMainTCCCurve
700AMainMinimumTrip
700AMainTotalClear
Base TCC Curves—Vista Coordination Curves
S&C Information Bulletin 680-211 35
Main Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
800-Ampere Main 2 0 .045 2 1 800
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Time,Seconds
Current,Amperes
800-AmpereMainTCCCurve
800AMainMinimumTrip
800AMainTotalClear
Base TCC Curves—Vista Coordination Curves
36 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
Vista Speed Curves
Parameters for Vista Speed curves generate the minimum tripping TCC curve. Tolerances for these curves are detailed in Table 2, and parameters for each TCC curve are shown below the corresponding graph, with the exception of K Speed curves, whose data points are found in the Time-Current Characteristic Curves section of sandc.com.
Category Setting Current Above 30 A① Current at or Below 30 A①
Time Overcurrent Response
Minimum Trip Time The greatest of minimum tripping curve or 8 ms
Maximum Trip Time
Maximum trip time is the greatest of minimum tripping curve:
• -10% expressed in terms of primary current
• +20% expressed in terms of time
• +10 ms (60-Hz systems) or +15 ms (50-Hz systems)
• +16 ms (60-Hz systems) or +20 ms (50-Hz systems) for currents from 1-2 times the current corresponding to a 10-ms trip time
• +14 ms for currents greater than 2 times the current corresponding to a 10-ms trip time
Maximum trip time is the greatest of minimum tripping curve:
• -3 A expressed in terms of primary current ●
• +20% expressed in terms of time
• +10 ms (60-Hz systems) or +15 ms (50-Hz systems)
• +16 ms (60-Hz systems) or +20 ms (50-Hz systems) for currents from 1-2 times the current corresponding to a 10-ms trip time
• +14 ms for currents greater than 2 times the current corresponding to a 10-ms trip time
Timing starts if
• Primary current -10% is equal to or greater than the minimum trip current, or low-current cutoff if enabled
• Primary current -3 A is equal to or greater than the minimum trip current or low-current cutoff if enabled ●
Timing does not start if primary current is less than the minimum trip current, or low-current cutoff if enabled
① With a CT ratio of 660:1, this value is 30 A . With a CT ratio of 1320:1, this value is 60 A .
● With a CT ratio of 660:1, tolerance is -3 A . With a CT ratio of 1320:1, tolerance is -6 A .
Table 2. Vista Speed Curve Tolerances
S&C Information Bulletin 680-211 37
TCC Curve Parameter
Base TCC Curves—Vista Speed Curves
A B p C Min. Pickup (Amperes)
7E 5 .5 0 2 1 14
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
7-Ampere E-Speed TCC Curve
7E Minimum Trip
7E Total Clear
38 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
10E 5 .5 0 2 1 20
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
10-Ampere E-Speed TCC Curve
10E Minimum Trip
10E Total Clear
Base TCC Curves—Vista Speed Curves
S&C Information Bulletin 680-211 39
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
13E 5 .5 0 2 1 26
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
13-Ampere E-Speed TCC Curve
13E Minimum Trip
13E Total Clear
40 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
E Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
15E 5 .5 0 2 1 30
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
15-Ampere E-Speed TCC Curve
15E Minimum Trip
15E Total Clear
Base TCC Curves—Vista Speed Curves
S&C Information Bulletin 680-211 41
TCC Curve Parameter
E Speed Curves
A B p C Min. Pickup (Amperes)
20E 5 .5 0 2 1 40
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
20-Ampere E-Speed TCC Curve
20E Minimum Trip
20E Total Clear
42 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
TCC Curve Parameter
E Speed Curves
A B p C Min. Pickup (Amperes)
25E 4 .9 0 1 .85 0 .8 50
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
25-Ampere E-Speed TCC Curve
25E Minimum Trip
25E Total Clear
S&C Information Bulletin 680-211 43
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
30E 4 .7 0 1 .9 1 60
Vista Speed Curves
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
30-Ampere E-Speed TCC Curve
30E Minimum Trip
30E Total Clear
44 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
E Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
40E 5 .5 0 2 1 80
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
40-Ampere E-Speed TCC Curve
40E Minimum Trip
40E Total Clear
Base TCC Curves—Vista Speed Curves
S&C Information Bulletin 680-211 45
E Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
50E 5 .5 0 2 1 10
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
50-Ampere E-Speed TCC Curve
50E Minimum Trip
50E Total Clear
46 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
65E 5 .5 0 2 1 130
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
65-Ampere E-Speed TCC Curve
65E Minimum Trip
65E Total Clear
Base TCC Curves—Vista Speed Curves
S&C Information Bulletin 680-211 47
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
80E 5 .5 0 2 1 160
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
80-Ampere E-Speed TCC Curve
80E Minimum Trip
80E Total Clear
Base TCC Curves—Vista Speed Curves
48 S&C Information Bulletin 680-211
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
100E 5 .5 0 2 1 200
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
100-Ampere E-Speed TCC Curve
100E Minimum Trip
100E Total Clear
Base TCC Curves—Vista Speed Curves
S&C Information Bulletin 680-211 49
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
125E 4 0 2 1 292
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
125-Ampere E-Speed TCC Curve
125E Minimum Trip
125E Total Clear
50 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
150E 4 0 2 1 362
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
150-Ampere E-Speed TCC Curve
150E Minimum Trip
150E Total Clear
Base TCC Curves—Vista Speed Curves
S&C Information Bulletin 680-211 51
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
175E 4 0 2 1 422
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
175-Ampere E-Speed TCC Curve
175E Minimum Trip
175E Total Clear
Base TCC Curves—Vista Speed Curves
52 S&C Information Bulletin 680-211
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
200E 4 0 2 1 483
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
200-Ampere E-Speed TCC Curve
200E Minimum Trip
200E Total Clear
Base TCC Curves—Vista Speed Curves
S&C Information Bulletin 680-211 53
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
250E 4 0 2 1 583
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
250-Ampere E-Speed TCC Curve
250E Minimum Trip
250E Total Clear
Base TCC Curves—Vista Speed Curves
54 S&C Information Bulletin 680-211
A B p C Min. Pickup (Amperes)
300E 4 0 2 1 689
TCC Curve Parameter
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
300-Ampere E-Speed TCC Curve
300E Minimum Trip
300E Total Clear
Base TCC Curves—Vista Speed Curves
S&C Information Bulletin 680-211 55
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
400E 4 0 2 1 901
E Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
400-Ampere E-Speed TCC Curve
400E Minimum Trip
400E Total Clear
56 S&C Information Bulletin 680-211
K Speed Curves
Min. Pickup (Amperes)
8K 15 .60
TCC Curve Parameter
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
8-Ampere K-Speed TCC Curve
8K Minimum Trip
8K Total Clear
K Speed Curves
S&C Information Bulletin 680-211 57
Min. Pickup (Amperes)
10K 20 .40
TCC Curve Parameter
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
10-Ampere K-Speed TCC Curve
10K Minimum Trip
10K Total Clear
K Speed Curves
58 S&C Information Bulletin 680-211
TCC Curve Parameter
Min. Pickup (Amperes)
12K 27 .31
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
12-Ampere K-Speed TCC Curve
12K Minimum Trip
12K Total Clear
K Speed Curves
S&C Information Bulletin 680-211 59
TCC Curve Parameter
Min. Pickup (Amperes)
15K 32 .90
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
15-Ampere K-Speed TCC Curve
15K Minimum Trip
15K Total Clear
K Speed Curves
60 S&C Information Bulletin 680-211
TCC Curve Parameter
Min. Pickup (Amperes)
20K 42 .45
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
20-Ampere K-Speed TCC Curve
20K Minimum Trip
20K Total Clear
K Speed Curves
S&C Information Bulletin 680-211 61
TCC Curve Parameter
Min. Pickup (Amperes)
25K 49 .60
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
25-Ampere K-Speed TCC Curve
25K Minimum Trip
25K Total Clear
K Speed Curves
62 S&C Information Bulletin 680-211
TCC Curve Parameter
Min. Pickup (Amperes)
30K 59 .92
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
30-Ampere K-Speed TCC Curve
30K Minimum Trip
30K Total Clear
K Speed Curves
S&C Information Bulletin 680-211 63
TCC Curve Parameter
Min. Pickup (Amperes)
40K 79 .59
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
40-Ampere K-Speed TCC Curve
40K Minimum Trip
40K Total Clear
K Speed Curves
64 S&C Information Bulletin 680-211
TCC Curve Parameter
Min. Pickup (Amperes)
50K 98
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
50-Ampere K-Speed TCC Curve
50K Minimum Trip
50K Total Clear
K Speed Curves
S&C Information Bulletin 680-211 65
TCC Curve Parameter
Min. Pickup (Amperes)
65K 128 .37
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
65-Ampere K-Speed TCC Curve
65K Minimum Trip
65K Total Clear
K Speed Curves
66 S&C Information Bulletin 680-211
TCC Curve Parameter
Min. Pickup (Amperes)
80K 159 .32
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
80-Ampere K-Speed TCC Curve
80K Minimum Trip
80K Total Clear
K Speed Curves
S&C Information Bulletin 680-211 67
TCC Curve Parameter
Min. Pickup (Amperes)
100K 195 .18
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
100-Ampere K-Speed TCC Curve
100K Minimum Trip
100K Total Clear
K Speed Curves
68 S&C Information Bulletin 680-211
TCC Curve Parameter
Min. Pickup (Amperes)
125K 274 .55
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
125-Ampere K-Speed TCC Curve
125K Minimum Trip
125K Total Clear
K Speed Curves
S&C Information Bulletin 680-211 69
TCC Curve Parameter
Min. Pickup (Amperes)
150K 329 .65
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
150-Ampere K-Speed TCC Curve
150K Minimum Trip
150K Total Clear
K Speed Curves
70 S&C Information Bulletin 680-211
TCC Curve Parameter
Min. Pickup (Amperes)
175K 401 .85
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
175-Ampere K-Speed TCC Curve
175K Minimum Trip
175K Total Clear
K Speed Curves
S&C Information Bulletin 680-211 71
TCC Curve Parameter
Min. Pickup (Amperes)
200K 479 .75
Base TCC Curves—Vista Speed Curves
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
200-Ampere K-Speed TCC Curve
200K Minimum Trip
200K Total Clear
72 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
8T 11 .2160 0 2 1 15 .71
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
8-Ampere T-Speed TCC Curve
8T Minimum Trip
8T Total Clear
S&C Information Bulletin 680-211 73
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
10T 12 .6625 0 2 1 20 .20
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
10-Ampere T-Speed TCC Curve
10T Minimum Trip
10T Total Clear
74 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
12T 12 .0794 0 2 1 27 .04
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
12-Ampere T-Speed TCC Curve
12T Minimum Trip
12T Total Clear
S&C Information Bulletin 680-211 75
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
15T 13 .2151 0 2 1 33 .76
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
15-Ampere T-Speed TCC Curve
15T Minimum Trip
15T Total Clear
76 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
20T 13 .4962 0 2 1 42 .5
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
20-Ampere T-Speed TCC Curve
20T Minimum Trip
20T Total Clear
S&C Information Bulletin 680-211 77
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
25T 13 .974 0 2 1 53 .92
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
25-Ampere T-Speed TCC Curve
25T Minimum Trip
25T Total Clear
78 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
30T 13 .1706 0 2 1 70 .4
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
30-Ampere T-Speed TCC Curve
30T Minimum Trip
30T Total Clear
S&C Information Bulletin 680-211 79
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
40T 13 .5054 0 2 1 89 .2
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
40-Ampere T-Speed TCC Curve
40T Minimum Trip
40T Total Clear
80 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
50T 13 .31 0 2 1 113 .3
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
50-Ampere T-Speed TCC Curve
50T Minimum Trip
50T Total Clear
S&C Information Bulletin 680-211 81
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
65T 13 .3188 0 2 1 142 .7
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
65-Ampere T-Speed TCC Curve
65T Minimum Trip
65T Total Clear
82 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
80T 13 .7059 0 2 1 176 .4
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
80-Ampere T-Speed TCC Curve
80T Minimum Trip
80T Total Clear
S&C Information Bulletin 680-211 83
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
100T 15 .0494 0 2 1 214 .8
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
100-Ampere T-Speed TCC Curve
100T Minimum Trip
100T Total Clear
84 S&C Information Bulletin 680-211
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
140T 14 .75 0 2 1 300
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
140-Ampere T-Speed TCC Curve
140T Minimum Trip
140T Total Clear
S&C Information Bulletin 680-211 85
Base TCC Curves—Vista Speed Curves
T Speed Curves
TCC Curve Parameter
A B p C Min. Pickup (Amperes)
200T 14 .75 0 2 1 480
0.01
0.1
1
10
100
1000
10 100 1000 10000 100000
Tim
e, S
econ
ds
Current, Amperes
200-Ampere T-Speed TCC Curve
200T Minimum Trip
200T Total Clear
86 S&C Information Bulletin 680-211
Base TCC Curves—IEEE Curves
IEEE CurvesParameters for IEEE curves generate the average tripping TCC curve. Tolerances for these curves are detailed in Table 3, and parameters for each TCC curve are shown below the corresponding graph.
Table 3. IEEE Curve Tolerances
Category Setting Current Above 30 A① Current at or Below 30 A①
Time Overcurrent②
Minimum Trip Time
The lowest of average tripping curve:• +5% expressed in terms of
current• The greatest of -10% expressed
in terms of time -1 cycle or 8 ms
The lowest of average tripping curve:• +1 .5 A expressed in terms of
current ●• The greatest of -10% expressed
in terms of time -1 cycle or 8 ms
Maximum Trip Time
The greatest of:• -5% expressed in terms of
primary current• +10% expressed in terms of time
+1 cycle
The greatest of:• -1 .5 A expressed in terms of
primary current ●• +10% expressed in terms of time
+1 cycle
Timing starts if
Primary current -5% is equal or greater than the minimum trip current, or low-current cutoff if enabled
Primary current -1 .5 A is equal or greater than the minimum trip current, or low-current cutoff if enabled ●
Timing does not start ifPrimary current +5% is less than the minimum trip current, or low-current cutoff if enabled
Primary current +1 .5 A is less than the minimum trip current, or low-current cutoff if enabled ●
Definite Time③
Minimum Trip Time The greatest of definite time setting -1 .5 cycles or 8 ms
Maximum Trip Time The greatest of definite time setting times 1 .03 or +1 .5 cycles
Timing starts ifPrimary current -5% is equal to or greater than the definite time current setting
Primary current -1 .5 A is equal to or greater than the definite time current setting ●
Timing does not start if Primary current +5% is less than the definite time current setting
Primary current +1 .5 A is less than the definite time current setting ●
① With a CT ratio of 660:1, this value is 30 A . With a CT ratio of 1320:1, this value is 60 A .
② Tolerances apply for currents at or below 25 multiples of pickup, for faults not exceeding the maximum current rating . Above 25 multiples of pickup, the curves are approximated by a definite minimum time equal to the time on each curve at 25 multiples of pickup .
③ Tolerances also apply for Definite Time with Time Overcurrent disabled .
● With a CT ratio of 660:1, tolerance is +/- 1 .5 A . With a CT ratio of 1320:1, tolerance is +/- 3 A .
S&C Information Bulletin 680-211 87
Base TCC Curves—IEEE Curves
IEEE Curves
TCC Curve Parameter
A B p C
IEEE Moderately Inverse (U1) 0 .0104 0 .0226 0 .02 1
IEEE Inverse (U2) 5 .95 0 .18 2 1
IEEE Very Inverse (U3) 3 .88 0 .0963 2 1
IEEE Extremely Inverse (U4) 5 .67 0 .0352 2 1
IEEE Short-Time Inverse (U5) 0 .00342 0 .00262 0 .02 1
0.01
0.1
1
10
100
1 10 100 1000
Time,Seconds
Current,Multiples ofPickup
IEEEAverageTrippingTCCCurves
U1AverageTrip
U2AverageTrip
U3AverageTrip
U4AverageTrip
U5AverageTrip
88 S&C Information Bulletin 680-211
Base TCC Curves—IEC Curves
IEC Curves
Table 4. IEC Curve Tolerances
Category Setting Current Above 30 A① Current at or Below 30 A①
Time Overcurrent②
Minimum Trip Time
The lowest of average tripping curve:• +5% expressed in terms of
current• The greatest of -10% expressed
in terms of time -1 cycle or 8 ms
The lowest of average tripping curve:• +1 .5 A expressed in terms of
current ●• -10% expressed in terms of time
-1 cycle or 8 ms
Maximum Trip Time
The greatest of:• -5% expressed in terms of
primary current• +10% expressed in terms of time
+1 cycle
The greatest of:• -1 .5 A expressed in terms of
primary current ●• +10% expressed in terms of time
+1 cycle
Timing starts if
Primary current -5% is equal or greater than the minimum trip current, or low-current cutoff if enabled
Primary current -1 .5 A is equal or greater than the minimum trip current, or low-current cutoff if enabled ●
Timing does not start ifPrimary current +5% is less than the minimum trip current, or low-current cutoff if enabled
Primary current +1 .5 A is less than the minimum trip current, or low-current cutoff if enabled ●
Definite Time③
Minimum Trip Time The greatest of definite time setting -1 .5 cycles or 8 ms
Maximum Trip Time The greatest of definite time setting times 1 .03 or +1 .5 cycles
Timing starts ifPrimary current -5% is equal to or greater than the definite time current setting
Primary current +1 .5 A is equal to or greater than the definite time current setting ●
Timing does not start if Primary current +5% is less than the definite time current setting
Primary current +1 .5 A is less than the definite time current setting ●
① With a CT ratio of 660:1, this value is 30 A . With a CT ratio of 1320:1, this value is 60 A .
② Tolerances apply for currents at or below 25 multiples of pickup, for faults not exceeding the maximum current rating . Above 25 multiples of pickup, the curves are approximated by a definite minimum time equal to the time on each curve at 25 multiples of pickup .
③ Tolerances also apply for Definite Time with Time Overcurrent disabled .
● With a CT ratio of 660:1, tolerance is +/-1 .5 A . With a CT ratio of 1320:1, tolerance is +/-3 A .
Parameters for IEC curves generate the average tripping TCC curve. Tolerances for these curves are detailed in Table 4, and parameters for each TCC curve are shown below the corresponding graph.
S&C Information Bulletin 680-211 89
0.1
1
10
100
1000
1 10 100 1000
Time,Seconds
Current,Multiples ofPickup
IECAverageTrippingTCCCurves
C1AverageTrip
C2AverageTrip
C3AverageTrip
C4AverageTrip
C5AverageTrip
Base TCC Curves—IEC Curves
IEC Curves
TCC Curve Parameter
A B p C
IEC Standard Inverse (C1) 0 .14 0 0 .02 1
IEC Very Inverse (C2) 13 .5 0 1 1
IEC Extremely Inverse (C3) 80 0 2 1
IEC Long-Time Inverse (C4) 120 0 1 1
IEC Short-Time Inverse (C5) 0 .05 0 0 .04 1
![ANALYSIS PERFORMANCE CHARACTERISTICS OF CENTRIFUGAL … · the characteristic curves of centrifugal pumps is shown [Haidary 2013]. Figure 1.Typical characteristic curves of centrifugal](https://img.pdfslide.net/doc/110x75/5e73ddf1c4757f2d5d52ef61/analysis-performance-characteristics-of-centrifugal-the-characteristic-curves-of.jpg)
