ABB 615 series Technical Manual page 734

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Protection functions

Pickup value

Non tripping area

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Operating characteristics with the Pickup Value setting, Power angle (α)

being +45 and Directional mode "Forward"

Once activated, the Timer activates the PICKUP output. The time characteristics are

according to DT. When the operation timer has reached the value of Trip delay time, the

TRIP output is activated. If a drop-off situation happens, that is, the value of power drops

below Pickup value before the trip delay is exceeded, the timer reset state is activated. If

the reset timer reaches the value set by Reset delay time, the operate timer resets and the

PICKUP output is deactivated.

The Timer calculates the pickup duration value PICKUP_DUR, which indicates the

percentage ratio of the pickup situation and the set operating time (DT). 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 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 signal activation is preselected with the global

setting Blocking mode.

The Blocking mode setting has three blocking methods. In the "Freeze timers" mode, the

operate 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 TRIP output" mode, the function operates

normally but the TRIP output is not activated.

1MAC059074-MB A

615 series ANSI

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