CYG PRS-7367 User Manual

Protection Functions
200 PRS-7367
3.41.3 Application Scope
In the ungrounded system of 110K and above voltage level, the gap current is generated after the
overvoltage of the neutral point of the transformer breaks down the gap. In this case, the gap
protection needs to be put in.
3.41.4 Settings
No
Name
Values(Range)
Unit
Step
Default
Description
1
GAPi_Ena
0~1
-
1
0
The Stage i GAP Enable/Disable
2
GAPi_Alm_Ena
0~1
-
1
0
The Stage i GAP Alarm
Enable/Disable
3
GAPi_Cur_Str
0.04-20.00In
A
0.01In
In
The Stage i GAP Start current
value
4
GAPi_Mul_Cur
0.8 - 10.0
-
0.1
1
The Stage i GAP Multiplier current
start value
5
GAPi_Vol_Str
10~100
V
0.01
10
The Stage i GAP Start voltage
value
6
GAPi_Op_T
0.040-60.000
s
0.001
0.040
The Stage i GAP operation time
delay
7
GAPi_Reset_T
0.000 -60.000
s
0.001
0.02
The Stage i GAP Reset time delay
3.42 Restricted Earth Fault Protection 64REF
3.42.1 Overview
In electrical power industry, power transformer is the one of the most precious and main important
primary equipment. For this main point of view, the protection of power transformer is very
important task (internal fault or external fault). The operation of power transformer is totally
dependent on windings. So, the protection of power transformer winding is great task and the main
purpose of Restricted Earth Fault Protection (64REF) is to monitored the power transformer
internal fault likes winding fault.
The operating calculation criteria of Restricted Earth Fault Protection (64REF) is based on
differential current and restrained current.
 The vector difference of neutral current is known as differential current
 Lines current is known as residual current
When the internal fault is happening in the winding of power transformer and the total earth fault
current is equal to the deference of current. To increase the high operated accuracy of Restricted
Earth Fault Protection (64REF) is dependently operate only fault current without any interference
of load current.
Notice!
For the connection point of view of transformer delta connected winding must be earthed with
earthing transformer and its electronically nominated between winding connection and current
transformer.

CYG PRS-7367 Specifications

General

Brand	CYG
Model	PRS-7367
Category	Control Unit
Language	English