4.1.9.9
Technical data
Table 170:
37 Technical data
Characteristic
Value
Operation accuracy
Depending on the frequency of the current
measured: f
n
±2 Hz
±1.5% of the set value or ±0.002 × I
n
Pickup time
Typically <55 ms
Reset time
<40 ms
Reset ratio
Typically 1.04
Retardation time
<35 ms
Trip time accuracy in definite time mode
mode ±1.0% of the set value or ±20 ms
4.2
Voltage protection
4.2.1
Three-phase overvoltage protection 59
4.2.1.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase overvoltage protection
PHPTOV
3U>
59
4.2.1.2
Function block
A070122 V2 EN
Figure 107:
Function block
4.2.1.3
Functionality
The three-phase overvoltage protection function 59 is applied on power system elements,
such as generators, transformers, motors and power lines, to protect the system from
excessive voltages that could damage the insulation and cause insulation breakdown. The
three-phase overvoltage function includes a settable value for the detection of overvoltage
either in a single phase, two phases or three phases.
Section 4
1MRS240050-IB C
Protection functions
222
REF615R
Technical Manual
Summary of Contents for RELION REF615R
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