ABB RELION REF615R Technical Manual page 232

Section 4
Protection functions
4.2.1.5
226
value of the Minimum trip time setting. For more information, see the
IDMT curves for overvoltage protection
The Timer calculates the pickup duration value PICKUP_DUR, which indicates the
percentage ratio of the pickup situation and the set trip time. The value is available in the
Monitored data view.
Blocking logic
There are three operation modes in the blocking function. The operation modes are
controlled by the BLOCK input and the global setting in Configuration/System/Blocking
mode which selects the blocking mode. The BLOCK input can be controlled by a binary
input, a horizontal communication input or an internal signal of the protection relay's
program. The influence of the BLOCK input signal activation is preselected with the global
Blocking mode setting.
The Blocking mode setting has three blocking methods. In the "Freeze timers" mode, the
operation timer is frozen to the prevailing value, but the TRIP is blocked and the Timers
are reset. In the "Block all" mode, the whole function is blocked and the timers are reset.
In the "Block TRIP output" mode, the function operates normally but the TRIP output is
not activated.
The "Freeze timers" mode of blocking has no effect during the inverse
reset mode.
Timer characteristics
The operating curve types supported by 59 are:
Table 172: Timer characteristics supported by IDMT operate curve types
Operating curve type
(5) ANSI Def. Time
(15) IEC Def. Time
(17) Inv. Curve A
(18) Inv. Curve B
(19) Inv. Curve C
(20) Programmable
1MRS240050-IB C
section in this manual.
REF615R
Technical Manual