Timer Characteristics - ABB RELION 620 Series Technical Manual

1MAC504801-IB E
4.2.1.5
620 series ANSI
Technical Manual
The Time multiplier setting is used for scaling the IDMT trip times.
The Minimum trip time setting parameter defines the minimum desired trip time for
IDMT. The setting is applicable only when the IDMT curves are used.
The Minimum trip time setting should be used with care because the
operation time is according to the IDMT curve, but always at least the
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 TRIPn 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 216: Timer characteristics supported by IDMT operate curve types
Operating curve type
(5) ANSI Def. Time
(15) IEC Def. Time
(17) Inv. Curve A
Table continues on next page
Section 4
Protection functions
section in this manual.
271