1MAC050144-MB C
Section 4
Protection functions
615 series ANSI
223
Technical Manual
4.1.13.7
Monitored data
Table 220: 37 Monitored data
4.2
Voltage protection
4.2.1
Three-phase overvoltage protection 59
4.2.1.1
Identification
4.2.1.2
Function block
Figure 105:
Function block
4.2.1.3
Functionality
The three-phase overvoltage protection 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.
59 includes both definite time (DT) and inverse definite minimum time (IDMT)
characteristics for the delay of the trip.
The function contains a blocking functionality. It is possible to block function outputs,
timer or the function itself, if desired.
4.2.1.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are Enable and Disable.
The operation of the three-phase overvoltage protection can be described by using a
module diagram. All the modules in the diagram are explained in the next sections.
Name
Type
Values (Range)
Unit
Description
PICKUP_DUR
FLOAT32
0.00...100.00
%
Ratio of start time / operate time
37
Enum
1 = on
2 = blocked
3 = test
4 = test/blocked
5 = off
Status
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase overvoltage protection
PHPTOV
3U>
59
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