69 / 248
Protection of 400 H systems
(cont.)
Protection
(cont.)
Micrologic electronic trip units
Micrologic 2.2, 2.3 or 5.2, 5.3 with A or E measurement functions are suitable for
400 Hz. The use of electronics offers the advantage of greater operating stability
when the frequency varies. However the units are still sub
j
ect to temperature rise
caused by the frequency.
The practical consequences are:
limit settings to 0.9 In (see the Ir derating table below)
b
WKH ORQJ WLPH VKRUW WLPH DQG LQVWDQWDQHRXV SLFN XSV DUH QRW PRGL¿HG
b
(see pages
A-17 or A-19)
the accuracy of the displayed measurements is 2 % (class II).
b
7KHUPDO GHUDWLQJ PD[LPXP ,U VHWWLQJ
&LUFXLW EUHDNHU
0D[LPXP VHWWLQJ
FRHI¿FLHQW
0D[ ,U VHWWLQJ DW
+]
NSX100N
1
100
NSX250N
0.8
225
NSX400N
0.8
320
NSX630N
0.8
500
([DPSOH
An NSX250N, equipped with a Micrologic 2.2, Ir = 250 A at 50 Hz, must be limited to
use at Ir = 250 x 0.9 = 225 A.
,WV VKRUW WLPH SLFN XS ZLWK ¿[HG WLPH GHOD\ LV DGMXVWDEOH IURP WR ,U
WR $
The instantaneous pick-up remains at 3000 A.
PB103363
Micrologic 5 E trip unit.
2) DX[LOLDU\ FRQWDFWV LQ +] QHWZRUNV
(OHFWULFDO FKDUDFWHULVWLFV RI DX[LOLDU\ FRQWDFWV
Contacts
Standard
Low level
Utilisation cat. (IEC 60947-5-1)
AC12
AC15
CA12
CA15
Operational current
(A)
24 V
6
6
5
3
48 V
6
6
5
3
110 V
6
5
5
2.5
220/240 V
6
4
5
2
380/415 V
6
2
5
1.5
044314
OF auxiliary contact.
01 DQG 0; YROWDJH UHOHDVHV IRU &RPSDFW
16;
DW
+] DQG 9
For circuit breakers on 400 Hz systems, only 125 V DC MN or MX releases may be
XVHG 7KH UHOHDVH PXVW EH VXSSOLHG E\ WKH +] V\VWHP YLD D UHFWL¿HU EULGJH WR EH
selected from the table below) and an additional resistor with characteristics
depending on the system voltage.
U (V) 400 Hz
5HFWL¿HU
Additional resistor
220/240 V
Thomson 110 BHz or
4.2 k
8
-5 W
General Instrument W06 or
Semikron SKB at 1.2/1.3
380/420 V
Semikron SKB at 1.2/1.3
10.7 k
8
-10 W
Note:
RWKHU PRGHOV RI UHFWL¿HU EULGJHV PD\ EH XVHG LI WKHLU FKDUDFWHULVWLFV DUH DW OHDVW HTXLYDOHQW
to those stated above.
044313
MX or MN voltage release.
DB115579
U volt
R
a
400 H
z
a
MN/M
X
1
2
5
V
DC
Wiring diagram.
6'[ LQGLFDWLRQ FRQWDFWV
The SDx module may be used in 400 Hz systems for voltages from 24 to 440 V.
An SDx relay module installed inside the circuit breaker can be used to remote the
overload-trip signal.
This module receives the signal from the Micrologic electronic trip unit via an optical
link and makes it available on the terminal block. The signal is cleared when the
circuit breaker is closed.
These outputs can be reprogrammed to be assigned to other types of tripping or
alarm
(see page A-81)
.
PB103377
SDx remote indication relay module
with its terminal block.
A-53
559E1600.indd
version: 1.0