Thytronic NC020 - MMI; Communication Interfaces; Local Port; Remote Port

TECHNICAL DATA
15
NC020 - Manual - 05 - 2022
3.4 MMI
Display 16x2 LCD backlight module
LEDs
• ON/fail 1 (green)
• Start 1 (yellow)
• Trip 1 (red)
• Trip I>, I>>, I>>> RMS and fundamental (red) 1 (red)
• Trip 46N, 50N 1 (red)
• Trip 59H 1 (red)
• 52b - Circuit Breaker position 1 (red)
• TD - state 1 (red)
Keyboard 8 keys
[1]
3.5 COMMUNICATION INTERFACES
— Local port
RS232
• Connection RJ10
• Baud rate 19200 bps
• Parity None
• Protocol ModBus®RTU
— Remote port
RS485
• Connection screw terminals
• Baud rate 1200...57600 bps
• Parity None
• Protocol ModBus®RTU
3.6 GENERAL SETTINGS
Relay rated frequency f
n
50, 60 Hz
Phase CT primary rated current I
np
[2]
1 A...5000 A
1...99 A (step 1 A)
100...5000 A (step 5 A)
Neutral CT primary rated current I
Nnp
[3]
1 A...5000 A
1...99 A (step 1 A)
100...5000 A (step 5 A)
3.7 PROTECTIVE ELEMENTS
— Discharge time - TD
tD Discharge time (t
D
) 6...6000 s (step1 s)
— Undercurrent - 37
[4]
I< Element
Definite time
37 First threshold definite time (
I <
def
) 0.1 I
n
I<
def
Operating time (t
I
<
def
) 0.100 s
I<< Element
Definite time
37 Second threshold definite time (
I <<
def
) 0.05...1.00 I
n
(step 0.01 I
n
)
I<<
def
Operating time (t
I
<<
def
) 0.03...600 s
0.03...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...600 s (step 1 s)
— Neutral unbalance overcurrent - 46N
[5]
Compensation:
[6]
Compensation current (I
NC MOD calib
) 0.01...0.50 I
Nn
(step 0.01 I
Nn
)
Compensation angle (I
NC PHI calib
) 0...359° (step 1°)
Nota 1 The “ O” and “ I” keys are enabled for CB opening and closing
Note 2 The rated current settings doesn’t concern the 50/51 protection elements; they must agree with nominal primary current for CT inputs for a
correct reading of the phase current primary values (Reading Direct).
Note 3 The nominal current settings doesn’t concern the 46N protection element; it must agree with nominal primary current of the CT inputs for a
correct reading of the unbalance neutral current primary values (Reading Direct).
Note 4 The 37 protection is based on RMS value measurement of three phase currents (the computed RMS value takes into account the contribution
of fundamental and harmonic up to twenty-third order). The first element is an internal element servicing the Timer Discharge (TD) function
Note 5 The 46N protection is based on I
NC
neutral compensated current I
NC
= I
N
- I
C
(I
N
= RMS value of fundamental component for neutral current,
I
C
= compensation setting for neutral current).
Note 6 Setting of the compensation parameters are available inside the Set \ IN Compensation menu.