Protection Functions
PRS-7367 57
Do not set the multiplier setting 67G_Mult_Cur_Str higher than necessary. If the value is
too high, the function may not operate at all during an inrush followed by a fault, no
matter how severe the fault is.
The start value multiplication is normally done when the inrush detection function
(OCR_INR) is connected to the Ena_Mult input by Three phase inrush function
OCR_INR.
Where
：
67G_Cur_Str is the start value of 67G.
67G_VCE_Str is the voltage start value of 67G.
67G_Vol_Blk_Ena can enable voltage limit.
67G_Mult_Cur_Str is the multiplier for scaling the start value.
 Timer element
The functional module diagram is shown as below:
Figure 3.5-6 Functional module diagram
Once initiation logic is fulfilled and no 67G_Blk signal is activated, the 67G_Str signal is set.
The timer model is determined by IDMT curves for over quantity protection.
The operation signal is activated after the operation timer has reached the calculated value.
However, 67G_Min_Op_T defines the minimum desired operate time for IDMT. If a drop-off
situation happens, that is, a fault suddenly disappears before the operate delay is exceeded, the
operation will reset after the set value 67G_Reset_T is exceeded.
NOTICE!
The 67G_Min_Op_T setting should be used with great care because the operation time
is according to the IDMT curve, but always at least the value of the 67G_Min_Op_T
setting.
67G can be blocked from 67G_Blk, the binary input. Activation of 67G_Blk input deactivates all
outputs and resets internal timers.
The start signals from the function can be blocked from 67G_Blk_Str, the binary input.
The operate signals from the function can be blocked from 67G_Blk_Op, the binary input.
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