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
output is not deactivated
when blocking is activated. 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.
4.5.2.5
Timer characteristics
The operating curve types supported by 27 are:
Table 522:
Supported IDMT operate curve types
Operating curve type
(5) ANSI Def. Time
(15) IEC Def. Time
(21) Inv. Curve A
(22) Inv. Curve B
(23) Programmable
4.5.2.6
Application
27 is applied to power system elements, such as generators, transformers, motors and
power lines, to detect low voltage conditions. Low voltage conditions are caused by
abnormal operation or a fault in the power system. 27 can be used in combination with
overcurrent protections. Other applications are the detection of a no-voltage condition, for
example before the energization of a high voltage line, or an automatic breaker trip in case
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
623
Technical Manual
Содержание Relion 615 series
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