ABB Relion 650 Series Applications Manual page 103

1MRK 505 287-UUS B
Operation : Disabled/Enabled .
UV2PTUV (27) measures selectively phase-to-ground voltages, or phase-to-phase voltage chosen
by the setting
This means operation for phase-to-ground voltage if:
<
V (%)
EQUATION1711 V1 EN-US
and operation for phase-to-phase voltage if:
Vpickup
EQUATION1991-ANSI V1 EN-US
Characteristic1 : This parameter gives the type of time delay to be used for step 1. The setting can
Definite time/Inverse Curve A/Inverse Curve B . The choice is highly dependent of the
be.
protection application.
OpModen : This parameter describes how many of the three measured voltages that should be
below the set level to give operation for step
of 3 or 3 out of 3 . It is sufficient that one phase voltage is low to give operation. If the function
shall be insensitive for single phase-to-ground faults
Pickupn : Set undervoltage operation value for step n ( n =step 1 and 2), given as % of the global
parameter
essential to consider the minimum voltage at non-faulted situations. This voltage is larger than
90% of nominal voltage.
tn : Time delay for step n ( n =step 1 and 2), given in s. This setting is highly dependent of the
protection application. In many applications the protection function does not directly trip where
there is short circuit or ground faults in the system. The time delay must be coordinated to the
short circuit protection.
t1Min : Minimum operating time for inverse time characteristic for step 1, given in s. When using
inverse time characteristic for the undervoltage function during very low voltages can give a short
operation time. This might lead to unselective trip. By setting
for other protections such unselective tripping can be avoided.
TD1 : Time multiplier for inverse time characteristic. This parameter is used for coordination
between different inverse time delayed undervoltage protections.
8.2 Two step overvoltage protection OV2PTOV (59)
Busbar protection REB650
Application manual
ConnType .
×
VBase kV ( )
3
< ×
(%) VBase(kV)
VBase . This setting is highly dependent of the protection application. Here it is
The function must be externally blocked when the protected object is
disconnected.
© Copyright 2013 ABB. All rights reserved
n ( n =step 1 and 2). The setting can be 1 out of 3 , 2 out
2 out of 3 can be chosen.
t1Min longer than the operation time
Section 8
Voltage protection
(Equation 18)
(Equation 19)
GUID-089477DD-5BC6-4DB5-BC0A-523005A57CA0 v1
97