The Timer calculates the start duration value START_DUR, which indicates the
percentage ratio of the start situation and the set operation 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
OPERATE
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 OPERATE output" mode, the function
operates normally but the
OPERATE
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 PHPTUV are:
Table 277:
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
PHPTUV 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. PHPTUV 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 of a blackout. PHPTUV is also used to initiate voltage
correction measures, such as insertion of shunt capacitor banks, to compensate for a
reactive load and thereby to increase the voltage.
Section 4
1MRS757454 D
Protection functions
264
611 series
Technical Manual
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