5-120
C70 Capacitor Bank Protection and Control System
GE Multilin
5.6 GROUPED ELEMENTS
5 SETTINGS
5
I2t CURVES:
The curves for the I
2
t are derived from the formulae:
,
(EQ 5.10)
where:
T
= Operate Time (sec.); TDM = Multiplier Setting;
I
= Input Current;
I
pickup
= Pickup Current Setting;
T
RESET
= Reset Time in sec. (assuming energy capacity is 100% and RESET: Timed)
FLEXCURVES™:
The custom FlexCurves™ are described in detail in the FlexCurves™ section of this chapter. The curve shapes for the
FlexCurves™ are derived from the formulae:
(EQ 5.11)
(EQ 5.12)
where:
T
= Operate Time (sec.), TDM = Multiplier setting
I
= Input Current,
I
pickup
= Pickup Current setting
T
RESET
= Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)
DEFINITE TIME CURVE:
The Definite Time curve shape operates as soon as the pickup level is exceeded for a specified period of time. The base
definite time curve delay is in seconds. The curve multiplier of 0.00 to 600.00 makes this delay adjustable from instanta-
neous to 600.00 seconds in steps of 10 ms.
(EQ 5.13)
(EQ 5.14)
where:
T
= Operate Time (sec.), TDM = Multiplier setting
I
= Input Current,
I
pickup
= Pickup Current setting
T
RESET
= Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)
RECLOSER CURVES:
The C70 uses the FlexCurve™ feature to facilitate programming of 41 recloser curves. Please refer to the FlexCurve™
section in this chapter for additional details.
Table 5–19: I
2
T CURVE TRIP TIMES
MULTIPLIER
(TDM)
CURRENT ( I / I
pickup
)
1.5
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
0.01
0.44
0.25
0.11
0.06
0.04
0.03
0.02
0.02
0.01
0.01
0.10
4.44
2.50
1.11
0.63
0.40
0.28
0.20
0.16
0.12
0.10
1.00
44.44
25.00
11.11
6.25
4.00
2.78
2.04
1.56
1.23
1.00
10.00
444.44
250.00
111.11
62.50
40.00
27.78
20.41
15.63
12.35
10.00
100.00
4444.4
2500.0
1111.1
625.00
400.00
277.78
204.08
156.25
123.46
100.00
600.00
26666.7
15000.0
6666.7
3750.0
2400.0
1666.7
1224.5
937.50
740.74
600.00
T
TDM
100
I
I
pickup
----------------
⎝
⎠
⎛
⎞
2
--------------------------
×
=
T
RESET
TDM
100
I
I
pickup
----------------
⎝
⎠
⎛
⎞
2
–
----------------------------
×
=
T
TDM
FlexCurve Time at
I
I
pickup
----------------
⎝
⎠
⎛
⎞
×
=
when
I
I
pickup
----------------
⎝
⎠
⎛
⎞
1.00
≥
T
RESET
TDM
FlexCurve Time at
I
I
pickup
----------------
⎝
⎠
⎛
⎞
×
when
I
I
pickup
----------------
⎝
⎠
⎛
⎞
0.98
≤
=
T
TDM in seconds, when
I
I
pickup
>
=
T
RESET
TDM in seconds
=
Summary of Contents for UR Series C70
Page 2: ......
Page 10: ...x C70 Capacitor Bank Protection and Control System GE Multilin TABLE OF CONTENTS ...
Page 344: ...5 220 C70 Capacitor Bank Protection and Control System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 586: ...D 10 C70 Capacitor Bank Protection and Control System GE Multilin D 1 OVERVIEW APPENDIXD D ...
