ABB Relion 650 Series Applications Manual page 106

Section 8
Voltage protection
Characteristic1 : This parameter gives the type of time delay to be used. The setting can be.
Definite time/Inverse Curve A/Inverse Curve B/Inverse Curve C . The choice is highly dependent of
the protection application.
OpModen : This parameter describes how many of the three measured voltages that should be
above the set level to give operation for step n (n=step 1 and 2). The setting can be
of 3 or 3 out of 3 . In most applications it is sufficient that one phase voltage is high to give
operation. If the function shall be insensitive for single phase-to-ground faults
chosen, because the voltage will normally rise in the non-faulted phases at single phase-to-ground
faults.
Pickupn : Set overvoltage operating value for step n (n=step 1 and 2), given as % of the global
parameter
to consider the Maximum voltage at non-faulted situations. Normally this voltage is less than 110%
of nominal voltage.
tn : time delay for step n (n=step 1 and 2), given in s. The setting is highly dependent of the
protection application. In many applications the protection function has the task to prevent
damages to the protected object. The speed might be important for example in case of protection
of transformer that might be overexcited. The time delay must be co-ordinated with other
automated actions in the system.
t1Min : Minimum operating time for inverse time characteristic for step 1, given in s. For very high
voltages the overvoltage function, using inverse time characteristic, can give very short operation
time. This might lead to unselective trip. By setting
protections such unselective tripping can be avoided.
TD1 : Time multiplier for inverse time characteristic. This parameter is used for co-ordination
between different inverse time delayed undervoltage protections.
8.3 Two step residual overvoltage protection ROV2PTOV
(59N)
8.3.1 Identification
Function description
Two step residual overvoltage
protection
8.3.2 Application
Two step residual overvoltage protection ROV2PTOV (59N) is primarily used in high impedance
grounded distribution networks, mainly as a backup for the primary ground fault protection of the
feeders and the transformer. To increase the security for different ground fault related functions,
the residual overvoltage signal can be used as a release signal. The residual voltage can be
measured either at the transformer neutral or from a voltage transformer open delta connection.
100
VBase . The setting is highly dependent of the protection application. Here it is essential
IEC 61850
identification
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t1Min longer than the operation time for other
IEC 60617
identification
ROV2PTOV
3U0>
IEC10000168 V1 EN-US
1MRK 505 287-UUS B
1 out of 3, 2 out
3 out of 3 can be
ANSI/IEEE C37.2
device number
59N
Busbar protection REB650
Application manual
IP14546-1 v4
SEMOD54295-2 v4
M13809-3 v7