
FUNCTION CHARACTERISTICS
32
NA20 - Manual - 04 - 2022
Use of measured values
f
i
L1,
i
L2
,
i
L3
I
L1,
I
L2
,
I
L3
I
L1-
2n
d,
I
L2
-2
nd
,
I
L3
-2
nd
I
L1-
3r
d,
I
L3
-3
rd
,
I
L3
-3
rd
I
L1-
4t
h,
I
L2
-4
th
,
I
L3
-4
th
I
L1-
5t
h,
I
L2
-5
th
,
I
L3
-5
th
i
E
I
E
I
E-
3rd
I
1
I
2
Temperature (PT1....PT8)
B
in
ar
y in
pu
ts
IN
1,
IN
2.
..IN
x
Start (ST
ART) Relays K1...K6
Trip (TRIP) Relè K1...K6...K10
Start (ST
ART) LEDs L1...L5
Trip (TRIP) LEDs L1...L5
Selective block input
BLIN1
Selective block output BLOUT1
Cold Load Pickup (CLP)
Second harmonic restraint
Logic block - BLOCK1
Breaker failure (BF)
PROTECTION
Thermal with Pt100 probes (26)
Undercurrent
(37)
Negative sequence overcurrent (46)
Negative sequence-positive current ratio
Thermal image
(49)
Phase overcurrent
(50/51)
Residual overcurrent (50N/51N)
Breaker failure (BF)
CONTROL and MONITORING
CT Monitoring (74CT)
Trip Circuit Supervision (TCS)
Second harmonic restraint (2NDH-REST)
Logic block (BLOCK1)
Selective block (BLOCK2)
Diagnostic
Element states
Binary input states
Selective block
state (Block2)
Output relay states
MEASURES
Frequency
Phase currents
Residual current
Positive sequence current
Negative sequence current
Harmonic currents
Thermal image
Temperature (Pt100 on MPT module)
EVENT RECORDER
Event 0
Event 1
Event ...
Event 299
FAULT RECORDER
Fault 0
Fault 1
Fault ...
Fault 19
OSCILLOGRAPHY
Record 1
Record 2
Record ...
Содержание NA20
Страница 207: ...APPENDIX 207 NA20 Manual 04 2022...