Areva MiCOM P921 - Page 26

P92x/EN GS/E11 Technical Guide
Getting Started
Page 12/18 MiCOM P921-P922-P923
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11.3 VT Ratios
The default ratios are equal to 1. If other ratios are required, please follow the
instructions below. From the default display, press 2 once, 6 once, 2 once and
press 6 once to access the « VT RATIO » menu.
Then, press 2 once and the following prompt will appear :
Main VT Primary
110.0 V
Change the setting by pressing either the 2 key or the 8 key. To validate the new
value, press the enter key 5.
Press 2 once and the following prompt will appear (if the voltage input range is
"57-130V") :
Main VT Sec’y
110.0 V
If the voltage input range is 220-480V, there is no need to specify the VT secondary
level.
Change the setting by pressing either the 2 key or the 8 key. To validate the new
value, press the enter key 5.
If the connection scheme includes a residual VT, the ratio of this VT must be set in this
menu. The prompts will be :
E/Gnd VT Primary
110.0 V
and
E/Gnd VT Sec'y
110.0 V
11.4 Connection mode
From the heading of the menu, press 8 once to go back to the default display.
From the default display, press 2 once, 6 once and 2 once to access to the menu
« CONFIGURATION », sub-menu « GENERAL ». Press 2 once.
The following connection schemes are supported :
3V
PN
= 3 phase-neutral VTs
3V
PN
+ V
R
= 3 phase-neutral VTs + residual VT
3V
PP
+ V
R
= 3 phase-phase VTs + residual VT
2V
PP
+ V
R
= 2 phase-phase VTs + residual VT
The default configuration is :
Connection
3V
PN