Power Automation and Protection Division
I.L. 40-201.9
REL 352 Version 1.00
5-1
5
1.
INTRODUCTION
REL 352 can be set through the front panel Man-Machine Interface (MMI) or through Remote
Communication Computer Software (WRELCOM Local Area Network).
This section will follow the sequence of settings displayed in the front panel display when the
relay system is in the settings mode. Reference will be made to current levels based on 5A sec-
ondary line ct’s.
!
CAUTION
For 1A secondary line ct’s multiply the current levels by 0.2.
For 50 Hz the timers are 20% longer unless stated on logic diagrams.
2.
RELAY SYSTEM SET UP
2.1
SOFTWARE VERSION (VERS)
Indicates the software version in the REL 352 (
read only).
2.2
System Frequency (FREQ)
Select either 60 or 50 Hz, depending on the power system frequency.
NOTE:
It is imperative that the proper selection of frequency is made prior to applica-
tion of power system currents and voltage.
2.3
Readout in Primary Values (RP)
A “YES” setting enables the REL 352 system to display all the monitored voltages and currents
in primary kAmperes and kVolts.
2.4
Current Transformer Type (CTYP)
This setting is used for load current monitoring, if the selection is to be displayed in primary kA-
mperes or secondary amperes.
For Example:
Enter CTYP = 5 if 1200/5 line ct’s are being used.
2.5
Current Transformer Ratio (CTR)
This setting is used for load current monitoring, if it is selected to be displayed in primary kAm-
peres. It has no effect on the protective relaying system.
Section 5. SETTING CALCULATIONS
