ABB RELION REX640 Technical Manual page 486

Protection and control

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Protection functions

Figure 275: Example of INTRPTEF operation in "Intermittent EF" mode in the faulty

feeder, Peak counter limit=3

The timer calculates the start duration value START_DUR which indicates the

percentage ratio of the start situation and the set operating time. The value is

available in the monitored data view.

If the function is used in the directional mode and an opposite direction transient

is detected, the BLK_EF output is activated for the fixed delay time of 25 ms. If the

START output is activated when the BLK_EF output is active, the BLK_EF output is

deactivated.

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

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

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

Blocking mode .

1MRS759142 F

Technical Manual