Thytronic NC20, Manual, Page: 16 / 227

16
16 NC20 - Manual - 01 - 2015 TECHNICAL DATA
3.6 GENERAL SETTINGS
Relay nominal frequency ( f
n
) 50, 60 Hz
Relay phase nominal current ( I
n
) 1 A or 5 A
[1]
Phase CT primary nominal current ( I
np
) 1 A...10 kA
1...499 A (step 1 A)
500...4990 A (step 10 A)
5000...10000 A (step 100 A)
Relay unbalance neutral nominal current ( I
Nn
) 1 A o 5 A
[1]
Unbalance neutral CT primary nominal current ( I
Nnp
) 1 A...10 kA
1...499 A (step 1 A)
500...4990 A (step 10 A)
5000...10000 A (step 100 A)
Relay nominal voltage ( U
n
) 50...130 V (step 1 V)
Line VT primary nominal voltage ( U
np
) 50 V...500 kV
50...499 V (step 1 V)
500...4990 V (step 10 V)
5000...49900 V (step 100 V)
50000...500000 V (step 1000 V)
3.7 PROTECTIVE FUNCTIONS
Base current - IB
Base current ( I
B
) 0.10...2.50 I
n
(step 0.01 I
n
)
Discharge time - TD
tD Discharge operating time ( t
D
) 0.1...100.0 min (step 0.1 min)
Thermal protection with Pt100 probes - 26
[2]
ThAL1...8 Alarm:
Alarm threshold 26 PT1...PT8 ( Th
AL1...8
) 0...200 °C
Operating time ThAL1...8 (t Th
AL1...8
) 0....100 s
Th>1...8 Trip:
Trip threshold 26 PT1...PT8 ( Th>
1...8
) 0...200 °C
Operating time ThAL1...8 (t Th>
1...8
) 0....100 s
Undervoltage - 27
Common confi guration:
27 Operating logic ( Logic 27) AND/OR
U< Element
U < Curve type ( U <
Curve
) DEFINITE/INVERSE
[3]
Defi nite time
27 First threshold defi nite time (
U<
def
) 0.05...1.10 U
n
(step 0.01 U
n
)
U<
def
Operating time ( t
U
<
def
) 0.03...100.0 s
0.03...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Inverse time
27 First threshold inverse time (
U<
inv
) 0.05...1.10 U
n
(step 0.01 U
n
)
U<
inv
Operating time ( t
U
<
inv
) 0.10...100.0 s
0.10...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
U<<Element
Defi nite time
27 Second threshold defi nite time (
U<<
def
) 0.05...1.10 U
n
(step 0.01 U
n
)
U<<
def
Operating time ( t
U
<<
def
) 0.03...100.0 s
0.03...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Pickup time ≤ 0.03 s
Dropout ratio 1.03...1.05
Dropout time ≤ 0.05 s
Overshoot time 0.03 s
Pickup accuracy ± 0.3% with 0.1 U
n
/ E
n
, ± 0.1% with 1 U
n
/ E
n
Operate time accuracy 5% or ± 10 ms
Note 1 The nominal current settings doesn’t concern the protection elements; they must agree with hardware setting (dip-switch 1 A or 5 A) .
Note 2 The 26 element is available when the MPT module is connect on Thybus and enabled
Note 3 The mathematical formula for INVERSE curve is: t= 0.75 ∙
t
U
<
inv
/ [1 - ( U / U <
inv
)]
t = operating time (in seconds)
t
U
<
inv
= operatie time setting (in seconds)
U = input voltage
U<
inv
= threshold setting
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