MC2-30T
Doc. N°
MO-0483-ING
Copyright 2016
Date
17.03.2022
Rev.
2
Pag. 40
of
70
17.10 - Function:
1Io>
(First Earth Fault Element 50N/51N)
Status
→
Enab.
Yes
[No / Yes]
Options
→
f(t)
Type - D
[D / A / B / C / I / VI / EI / MI / SI]
→
tBI
Off
[Off / 2tBO]
Oper.Levels
→
Is
1
On
(0.01
÷
4)
step 0.01 On
Timers
→
ts
5
s
(0.02
÷
100)
step
0.01 s
→
tBO
0.75
s
(0.05
÷
0.75)
step
0.01 s
On = Rated primary current of CTs or of the current Tore CT.
17.10.1 - Description of variables
Enab.
: Function enabling (No = Disable / Yes = Enable)
f(t)
: Operation characteristic (Time/Current curve):
(D)
= Independent definite time
(A)
= IEC Inverse Curve type A
(B)
= IEC Very Inverse Curve type B
(C)
= IEC Extremely Inverse Curve type C
(I)
= IEEE Inverse Curve
(VI)
= IEEE Very Inverse Curve
(EI)
= IEEE Extremely Inverse Curve
(MI)
= IEEE Moderate Inverse Curve
(SI)
= IEEE Short Inverse Curve
tBI
: Blocking Input reset time
Off
= Permanent block
2tBO
= Set 2xtBO.
Is
: Minimum operation level
ts
: Trip time delay
tBO
: Time to reset of the Blocking Output after expiring of the Trip time delay. “tBO” is
also the trip time delay of the Breaker Failure function.
17.11 - Function:
2Io>
(Second Earth Fault Element 50N/51N)
Status
→
Enab.
Yes
[No / Yes]
Options
→
tBI
Off
[Off / 2tBO]
Oper.Levels
→
Is
1
On
(0.01
÷
9.99)
step 0.01 On
Timers
→
ts
5
s
(0.02
÷
100)
step
0.01 s
→
tBO
0.75
s
(0.05
÷
0.75)
step
0.01 s
On = Rated primary current of CTs or of the current Tore CT.
17.11.1 - Description of variables
Enab.
: Function enabling (No = Disable / Yes = Enable)
tBI
: Blocking Input reset time
Off
= Permanent block
2tBO
= Set 2xtBO.
Is
: Minimum operation level
ts
: Trip time delay
tBO
: Time to reset of the Blocking Output after expiring of the Trip time delay. “tBO” is
also the trip time delay of the Breaker Failure function.
