CYG PRS-7367 - Three phase inrush function OCR_INR

Protection Functions
PRS-7367 185
3.36.3 Application Scope
All close signals from different protection functions are routed through the close logic. The most
simplified application of the logic function is linking the close signal and ensuring that the signal is
long enough.
3.36.4 Settings
In the following table, i is the protection stage number, it can be set according to the requirements.
Name
Values
（Range）
Unit
Step
Default
Description
Close_ModeOutput
0 - 1
-
1
0
BO mode：
0: Steady
1: Lockout
Close_OnDelay
0 - 60.00
s
0.01
0
Output pulse time
Close_OffDelay
0 - 60.00
s
0.01
0.01
Output on delay time
3.37 Three phase inrush function OCR_INR
3.37.1 Overview
This relay provides three phase inrush for current protection.
3.37.1.1 Function Block
The function block of the protection is as below.
I3P
OCR_INR
Blk
H2Blk
H2BlkPhA
H2BlkPhB
H2BlkPhC
Figure 3.37-1 The overcurrent relay inrush function block
3.37.2 Protection Principle
The inrush detection function can be used to selectively block overcurrent and earth fault function
stages when the ratio of second harmonic component over the fundamental component exceeds
the set value.