ABB RER620, Technical Manual

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Section 4
1MAC309294-MB F
Protection functions
210 RER620
Technical Manual
4.3.4 Positive sequence overvoltage protection 59PS
4.3.4.1 Identification
4.3.4.2 Function block
Figure 95: Function block
4.3.4.3 Functionality
The positive sequence voltage is constantly compared with the set value of positive
sequence voltage and starts when the measured sequence voltage exceeds the
Pickup
value . If the overvoltage lasts the Trip delay time, the function gives the trip signal.
4.3.4.4 Operation principle
The 59PS function constantly monitors the magnitude of the positive sequence voltage. If
and when the measured positive sequence voltage exceeds the
Pickup value voltage, the
PICKUP output gets activated. Should the overvoltage situation last the Trip delay time,
the function trips through TRIP output.
The function includes Relative hysteresis setting in order to avoid oscillations of the
PICKUP output when the measured positive sequence voltage value lies near the Pickup
value voltage.
The delay of the heavy duty output relay is included in preset operate times (depends on
the value of delay compensation).
The definite timer is allowed to run only if the input signal BLOCK is inactive. If the
BLOCK signal is activated, the timer will be reset. Moreover the PICKUP and TRIP
signals cannot be activated when the BLOCK signal is active.
When the output PICKUP is active, the percentage of delay time duration that has elapsed
can be monitored through output PICKUPDUR of that sequence. It is possible to tune all
the time delays provided in the function such that they provide delay equal to set delay
within acceptable tolerance. Initialization input DLY_COM is used to provide
compensation for delays caused in software and mechanical output relays. When
FR_TIMER is active delay time counts are frozen, hence activation of FR_TIMER will
have effect of increasing effective time delays by the time for which FR_TIMER is active.
Functional description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Positive sequence overvoltage protection PSPTOV U1> 59PS
V3P
BLOCK
FR_TIMER
BLK_PICKUP
BLK_TRIP
59PS
PICKUP
TRIP
PICKUPDUR