Neutral Overvoltage (59N); Definite Time (59Ndt) - Siemens 7SR224 Technical Manual

2.12.5 Neutral Overvoltage (59N)

Figure 2-16 Neutral Overvoltage
Voltage Inputs:
Current Inputs:
Disable: 27/59, 47, 60VTS
Map Pickup LED:
The voltage source for the Neutral Overvoltage 59N function can be set as either Vn , calculated from the applied
3 phase voltage inputs or Vx, the V

2.12.6 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 Vs DTL
(Volts) (sec)
E
Check correct indication, trip output, alarm contacts, waveform record.
©2010 Siemens Protection Devices Limited
37 50
49
(x2) BF
I
L1
(I )
A
37 50
49
(x2) BF
I
L2
(I )
B
37 50
49
(x2) BF
I
L3
(I )
C
46
46 60
NPS
BC CTS
(x2)
67/
64
50G
H
I
(x4)
4
(I /I )
G SEF
NOTE: The use of some
functions are mutually exclusive
27
V 27S
L1
59
(V ) 59S
A
(x4)
27
V 27S
L2
59
(V ) 59S
B
(x4)
27
V 27S
L3
59
(V ) 59S
C
(x4)
V 27
4
(V ) 59
X
V (V ), V (V ), V (V
L1 A L2 B L3
n/a apply zero current to stabilize other functions
59N-n - Self Reset
input. Apply test voltage to 1 phase input or V
4
P.U. Current
Volts
7SR224 Argus Commissioning & Maintenance Guide
7SR224
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
60
VTS
67/ 67/ 67/
51G 50S 51S
(x4) (x4) (x4)
Note:
Example shows
Voltage Config =
47 81 Van, Vbn, Vcn
(x2) (x4)
74
59N Batt
TCS
(x2) Test
(x3)
Cap.
79
Test
)
C
input to suit.
4
Operate Time
2 x Vs
NOTES
Chapter 6 Page 49 of 73