1MAC050144-MB C
Section 4
Protection functions
615 series ANSI
237
Technical Manual
4.2.2.10
Technical data
Table 236: 27 Technical data
4.2.3
Residual overvoltage protection 59G/59N
4.2.3.1
Identification
4.2.3.2
Function block
Figure 111:
Function block
4.2.3.3
Functionality
The residual overvoltage protection 59G is used in distribution networks where the ground
overvoltage can reach non-acceptable levels in, for example, high impedance grounding.
The function picks up when the ground voltage exceeds the set limit. 59G operates with
the definite time (DT) characteristic.
The function contains a blocking functionality. It is possible to block function outputs, the
definite timer or the function itself, if desired.
Characteristic
Value
Pickup accuracy
Depending on the frequency of the voltage
measured: fn ±2Hz
±1.5% of the set value or ±0.002 x V
n
Pickup time
12
1.
Pickup value
= 1.0 x V
n
, Voltage before fault = 1.1 x V
n
, f
n
= 60 Hz, undervoltage in one phase-to-phase with
nominal frequency injected from random phase angle, results based on statistical distribution of 1000
measurements
2. Includes the delay of the signal output contact
Minimum
Typical
Maximum
V
Fault
= 0.9 x set
Pickup
value
62 ms
64 ms
66 ms
Reset time
< 40 ms
Reset ratio
Depends on the set
Relative hysteresis
Retardation time
< 35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Operate time accuracy in inverse time mode
±5.0% of the theoretical value or ±20 ms
3
3. Minimum
Pickup value
= 0.50,
Pickup value
multiples in range of 0.90 to 0.20
Suppression of harmonics
DFT: -50 dB at f = n x f
n
, where n = 2, 3, 4, 5,…
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Residual overvoltage protection
ROVPTOV
Uo>
59G
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