Thytronic NA20, Руководство пользователя, Страница: 18 / 208

TECHNICAL DATA
18 NA20 - Manual - 04 - 2022
‡ Thermal image - 49
Common configuration:
Initial thermal image
Dq
IN
( Dth
IN
) 0.0...1.0
Dq
B
(step 0.1
Dq
B
)
[1]
Reduction factor at inrush ( K
INR
) 1.0...3.0 (step 0.1)
Thermal time constant
t
( T ) 1...200 min (step 1 min)
DthIN activation time ( t
dthCLP
) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
DthAL1 Element
49 First alarm threshold ( Dth
AL1
) 0.3...1.0
Dq
B
(step 0.1
Dq
B
)
DthAL2 Element
49 Second alarm threshold ( Dth
AL2
) 0.5...1.2
Dq
B
(step 0.1
Dq
B
)
Dth> Element
49 Trip threshold ( Dth >) 1.100...1.300
Dq
B
(step 0.001
Dq
B
)
Pickup accuracy ± 1% with 0.1 I
n
, ± 1% with 1 I
n
Operate time accuracy 5% or ± 10 ms
‡ Phase overcurrent - 50/51
I> Element
I > Curve type ( I>
Curve
) DEFINITE
IEC/BS A, B, C, B-LI
ANSI/IEEE MI, VI, EI
RECTIFIER, I
2
t or EM
I
CLP
> Activation time ( t
CLP>
) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
I > Reset time delay ( t >
RES
) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
50/51 First threshold definite time ( I >
def
) 0.100...40.0 I
n
0.100...0.999 I
n
(step 0.001 I
n
)
1.00...9.99 I
n
(step 0.01 I
n
)
10.0...40.0 I
n
(step 0.1 I
n
)
I >
def
within CLP ( I
CLP>def
) 0.100...40.0 I
n
0.100...0.999 I
n
(step 0.001 I
n
)
1.00...9.99 I
n
(step 0.01 I
n
)
10.0...40.0 I
n
(step 0.1 I
n
)
I >
def
Operating time ( t >
def
) 0.04...200.00 s
0.04...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...200 s (step 1 s)
Inverse time
[2]
50/51 First threshold inverse time ( I >
inv
) 0.100...20.00 I
n
0.100...0.999 I
n
(step 0.001 I
n
)
1.00...20.00 I
n
(step 0.01 I
n
)
I >
inv
within CLP ( I
CLP>inv
) 0.100...20.00 I
n
0.100...0.999 I
n
(step 0.001 I
n
)
1.00...20.00 I
n
(step 0.01 I
n
)
I >
inv
Operating time ( t >
inv
) 0.02...60.0 s
0.02...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
Note 1
Dq
is the thermal image (p.u. of the basic over temperature corresponding to the basic current
I
B
).
Assuming that the secondary rated current of the line CT’s equals the rated current of the NA20 relay, as usually happens, the
I
B
value is the
ratio between the rated current of the protected element and the primary rated current of the CTs
Note 1 Standard Inverse Time (IEC 255-3/BS142 type A or SIT): t = 0.14 · t>
inv
/ [(I/I>
inv
)
0.02
- 1]
Very Inverse Time (IEC 255-3/BS142 type B or VIT): t = 13.5 · t>
inv
/ [(I/I>
inv
) - 1]
Extremely Inverse Time (IEC 255-3/BS142 type C or EIT): t = 80 · t>
inv
/ [(I/I>
inv
)
2
- 1]
Long time Inverse Time (IEC 255-3/BS B LI): t = 120 · t>
inv
/ [(I/I>
inv
) - 1]
Moderately Inverse (ANSI/IEEE type MI): t = t>
inv
· {0.01 / [(I/I>
inv
)
0.02
- 1] + 0.023}
Very Inverse (ANSI/IEEE type VI): t = t>
inv
· {3.922 / [(I/I>
inv
)
2
- 1] + 0.098}
Extremely Inverse (ANSI/IEEE type EI): t = t>
inv
· {5.64 / [(I/I>
inv
)
2
- 1] + 0.024}
I-squared-t (I
2
t = K): t = 16 · t>
inv
/ (I/I>
inv
)
2
Electromechanical (EM): t = 0.28 · t>
inv
/ [-0.236 · (I/I>
inv
)
-1
+ 0.339]
RECTIFIER (RI): t = 2351 · t>
inv
/ [(I/I>
inv
)
5.6
- 1]
t : operate time
I>
inv
: pickup value
t>
inv
: operate time setting
Asymptotic reference value: 1.1 I >
nv
Minimum operate time: 0.1 s
Equation is valid for 1.1 ≤ I/I>
inv
≤ 20
With I>
inv
pickup ≥ 2.5 I
n
, the upper limit is 50 I
n