4 Protection Functions and Specifications
D02706R02.30
L-PRO 4000 User Manual
4-29
59N Zero
Sequence
Overvoltage
The relay provides Zero sequence overvoltage protection from line side PT.
The element operates on the residual voltage quantity 3V0. The element has
one DTL and one Inverse Time stage
The device 59N Inverse Time provides three IEC inverse time curve types,
three IEEE inverse time types of Zero sequence overvoltage protection and one
user defined curve .The equation and the parameters of device 59N are listed
below
Pickup
T (3V0) =TMS (B+ (A/ ((3V0/3V0
pickup
)
p
-1)))
Reset
T (3V0) =TMS (TR/ ((3V0/3V0
pickup
)
2
-1))
Pickup
1.0 to 138.0 V secondary
Pickup Delay
0.00 to 10.00 seconds
Auxiliary
Enable/Disable
Gate Switch
AND or OR
Pickup
1.0 to 138.0 V secondary
Pickup Delay
0.00 to 10.00 seconds
Table 4.11: 59 Overvoltage Settings
Table 4.12: IEC and IEEE Curves
NO
Curve Type
A
B
P
1
IEC Standard Inverse
0.14 (Fixed)
0.00 (Fixed)
0.02 (Fixed)
2
IEC Very Inverse
13.5 (Fixed)
0.00 (Fixed)
1.00 (Fixed)
3
IEC Extremely Inverse
80.00 (Fixed)
0.00 (Fixed)
2.00 (Fixed)
4
IEEE Moderately Inverse
0.0104 (Fixed)
0.0228 (Fixed)
0.02 (Fixed)
5
IEEE Very Inverse
3.880 (Fixed)
0.0963 (Fixed)
2.00 (Fixed)
6
IEEE Extremely Inverse
5.67 (Fixed)
0.0352 (Fixed)
2.00 (Fixed)
7
User-defined
0.0010 to
1000.0000
0.0000 to
10.0000
0.01 to 10.00
Summary of Contents for L-PRO 4000
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