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4.2.6.7 Protection
The GRT100 can have 8 setting groups for protection according to the change of power system
operation, one of which is assigned to be active. To set protection, do the following:
• Press 6 (= Protection) on the "Setting (change)" screen to display the "Protection" screen.
/2 Protection
1=Change active group
2=Change setting
3=Copy group
Changing the active group
•
Press 1 (= Change active group) to display the "Change active group" screen.
/3 Change active group(Active group= *)
1=Group1 2=Group2 3=Group3 4=Group4
5=Group5 6=Group6 7=Group7 8=Group8
Current No.= * Select No. =
• Enter the selected number and press the
ENTER
key.
Changing the settings
Almost all the setting items have default values that are set when the product GRT100 was
shipped. For the default values, see Appendix D and H. To change the settings, do the following:
• Press 2 (= Change setting) to display the "Change setting" screen.
/3 Change setting (Active group= *)
1=Group1 2=Group2 3=Group3 4=Group4
5=Group5 6=Group6 7=Group7 8=Group8
• Press the group number to change the settings and display the "Protection" screen.
/4 Protection (Grou
p
*)
1=Tran p r
2=Tri
p
aramete
sfo
rmer
Settings are required for transformer parameter and protection functions.
Setting the transformer parameters
Enter the VT&CT ratio as follows:
• Press 1 (= Transformer parameter) on the "Protection" screen to display the "Transformer
parameter" screen.
/5 Tran parameter (Group *)
1=VT & CT ratio
sformer
• Press 1 (VT&CT ratio) to display the "VT&CT ratio" screen.