Neutral Overvoltage (59N); Definite Time (59Ndt); Figure 2-17 Neutral Overvoltage - Siemens 7SR21 Manual

2.13.5 Neutral Overvoltage (59N)

I
L1
(I
A
I
L2
(I
B
I
L3
(I
C
I
4
(I
G
I
5
(I
SEF
V
L1
(V )
A
V
L2
(V )
B
V
L3
(V )
C
V
4
(V )
X
Voltage Inputs:
Current Inputs:
Disable:
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

2.13.6 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, and check operation
Apply 2x setting voltage if possible and record operating time
©2010 Siemens Protection Devices Limited
37 50
49
(x2) BF
)
37 50
49
(x2) BF
)
37 50
49
(x2) BF
)
46
46 60
NPS
BC CTS
(x2)
)
)
functions are mutually exclusive
27
59
(x4)
27
47
59
(x2)
(x4)
27
59
(x4)
27
59
Optional
79

Figure 2-17 Neutral Overvoltage

V (V ), V (V
L1 A L2 B
n/a apply zero current to stabilize other functions
27/59, 47, 60VTS
59N-n - Self Reset
input. Apply test voltage to 1 phase input or V
4
7SR21 & 7SR22 Argus Commissioning and Maintenance
67/ 67/
51V 50 51
(x4) (x4)
67/ 67/
51V 50 51
(x4) (x4)
67/ 67/
51V 50 51
(x4) (x4)
60 67/ 67/
60
CTS- 50N 51N
VTS
I (x4) (x4)
67/ 67/ 81
50G 51G HBL
(x4) (x4) 2G
67/ 67/
64
50S 51S
H
(x4) (x4)
NOTE: The use of some
Note:
Example shows
81
Voltage Config =
(x6)
Van, Vbn, Vcn
59N 74
(x2) TCS
), V (V )
L3 C
7SR22
81
51c
HBL
2
81
HBL 51c
2
81
HBL 51c
2
81
HBL
2N
37G
(x2)
37S
(x2)
input to suit.
4
Chapter 6 Page 53 of 69