Micom P721, Техническое руководство

Страница: 56 / 334

P72x/EN FT/C21 User Guide
Page 16/38 MiCOM P721/P723
E/Gnd CT sec
1
A
Choose the rated secondary current of the earth CT.
Setting value: 1 or 5.
2.4.1.2 Submenu Configuration with Phase selected (P723 only)
Phases Text
L1, L2, L3
Choose a label (displayed with the associated
measurement value) for the 3 phases.
Possible choices are “L1, L2, L3”, “A, B, C” or “R, S, T”.
The values are modified after entering the password.
Stabiliz Resist. L1
30
Ω
This stabilizing resistor L1 (A or R) value is displayed
only if the analogue input mode is the Voltage mode.
It is used to set the resistor value of the P79x resistor
inserted in the outside input circuit of the protection
(phase L1).
Setting choice: 30
Ω
to 4000
Ω
, accuracy 0.1
Ω
.
The value is settable digit by digit, using or keys
to change the value, and or key to modify an other
digit.
Stabiliz Resist. L2
30
Ω
As above for phase L2 (or B or S).
Stabiliz Resist. L3
30
Ω
As above for phase L2 (or C or T).
Line CT Primary
1000
A
Choose the rated primary current of the CT.
Setting range: from 1 to 9999 – step 1.0000
Line CT sec
1
A
Choose the rated secondary current of the CT.
Setting value: 1 or 5.
2.4.2 Submenus LED 5 to 8
The LED 5 to LED 8 configuration submenu is used to assignate to a LED a protection
function (the LED lights up when the protection function is active).
The following table lists the protection functions that can be assigned to the LEDs (5 to 8) for
each model of relay.
Function P721 P723 Information
[87] Diff X Phase differential protection threshold
[87N] Diff X X Earth differential protection threshold
[87] tDiff X Time delayed phase differential protection
threshold
[87N] tDiff X X Time delayed earth differential protection
threshold
[87CZ] Check zone X Check Zone status
[95] Sup X Phase high impedance differential threshold
(buswire supervision)
[95N] Sup X Earth high impedance differential threshold
(buswire supervision)
[95] tSup X Time delayed phase high impedance differential
threshold (buswire supervision)
[95N] tSup X X Time delayed earth high impedance differential
threshold (buswire supervision)