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7SR11 & 7SR12 Commissioning and Maintenance Guide
2.14.5 Neutral Overvoltage (59N)
I
L1
I
L2
I
L3
Voltage Inputs:
Current Inputs:
Disable:
Map Pickup LED:
The voltage source for the Neutral Overvoltage 59N function is Vn, calculated from the applied 3 phase voltage
inputs. To test, apply test voltage to one phase input.
2.14.6 Definite Time (59NDT)
If DTL setting is small, gradually increase single phase voltage until element operates.
If DTL is large apply 0.9x setting, check for no operation, apply 1.1x setting, check operation
Apply 2x setting voltage if possible and record operating time
Phase
Setting
(Volts)
E
Check correct indication, trip output, alarm contacts, waveform record.
2.14.7 Inverse Time (59NIT)
It will be advantageous to map the function being tested to temporarily drive the relevant Pickup output in the
Pickup Config sub-menu in the Output Config menu as this will allow the Pick-up led to operate for the function.
©2017 Siemens Protection Devices Limited
37
(x2)
(I
)
A
37
(x2)
(I
)
B
37
(x2)
(I
)
C
46
BC
I
(I
)
4
G
27
V
(V
)
59
L1
A
(x4)
27
V
(V
)
59
L2
B
(x4)
27
V
(V
)
59
L3
C
(x4)
Figure 2-17
V
(V
), V
(V
L1
A
L2
n/a apply zero current to stabilize other functions
27/59, 47, 60VTS
59N-n - Self Reset
Delay
P.U. Current
(sec)
(Volts)
67/
67/
50
49
51V
50
51
BF
(x4)
(x4)
67/
67/
50
49
51V
50
51
BF
(x4)
(x4)
67/
67/
50
49
51V
50
51
BF
(x4)
(x4)
46
67/
67/
60
60
NPS
50N
51N
CTS
VTS
(x2)
(x4)
(x4)
67/
67/
50BF
50
51
SEF
SEF
NOTE: The use of some
functions are mutually exclusive
47
81
59N
(x2)
(x4)
(x2)
Optional
79
Neutral Overvoltage
), V
(V
)
B
L3
C
Operate Time
@ 2 x Vs
7SR12
81
HBL
51c
2
81
HBL
51c
2
81
HBL
51c
2
64H
Note:
Example shows
Voltage Config =
Van, Vbn, Vcn
74
T/
CCS
Tolerance
Chapter 6 Page 50 of 72
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