Timer Characteristics - ABB RED615 Technical Manual

Section 4
Protection functions
4.5.2.5
4.5.2.6
478
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 functionality. The operation modes
are controlled by the BLOCK input and the global setting 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 IED 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. 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.

Timer characteristics

The operating curve types supported by PHPTUV are:
Table 393: 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
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.
1YHT530004D05 D
615 series
Technical Manual