Functionality
32 USER MANUAL FPC 200 - 3/2017
2.3 Voltage based protections
Phase to phase overvoltage protection - ANSI code 59
Phase to phase overvoltage protection is one of the basic functions of FPC 200 numerical relays. It protects the feeder or
other elements of the power system from overvoltage. It comprises of time-delayed characteristics.
2.3.1.1 Functionality
Overvoltage protection is used as time delayed
protection. It picks up when voltage in one, two or three
phases exceeds the set threshold. The function can be
enabled or disabled through corresponding menu. The
settings of this function are applied to each of the three
phases to produce pickup and per each phase and
common trip signal.
Several overvoltage protection instances with different
settings can run independently at the same time.
The selection of pickup value, pickup delay as well as
drop-out ratio and drop-out delay helps the user to fine
tune the protection according to the project
specifications.
59 Overvoltage
Enabled:
Yes
Pickup value: 1.2Un
A
Trip delay: 0.4s
1A 1B 2A 2B 3A 3B
A
CONTROL SETTINGS
Pickup delay:
0.4s
Figure 2.25: Overvoltage protection setting as seen on HMI.
2.3.1.2 Measurements
The value of each phase to phase voltages is calculated
through measured phase voltages of measurement
voltage transformers. The input voltage is compared to
rated pickup voltage.
2.3.1.3 Delays
Function includes following delays explained in Chapter
2.1:
Pickup delay
Trip delay
Drop-out delay
2.3.1.4 Block settings
Pickup of any instance separately of protection can be
individually blocked by any user defined signal [2.6.5.].
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