GE Gerapid 2607 User Manual page 10

3.2.12 Current measurement system (Code 6)
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The SEL current measurement system consists of the
sensing c omponent (1) and signal-processing unit (2)
[Fig.17]. SEL sensor is integrated into a specially shaped
upper terminal of the breaker and is connected by a
shielded cable to the signal-processing unit. SEL control
unit is placed in the control- box [Fig. 18].
(1) SEL sensor
(2) SEL control
unit
Fig. 17 SEL current measurement system
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SEL may be used f or recording DC currents in selected
measurement ranges of 6 kA or 12 kA. Measurement of
rated current values and of the current rise may now be
made directly at the breaker.
•
The sensor includes Hall-probes and delivers a propor-
tional signal-output to the SEL control. The signal-
processing unit transforms input signal, into standard
output signals shown in the table below.
•
The outputs are insulated from the main voltage. The in-
sulation withstands voltages up to 4 kV RMS and up to
40 kV in peak.
•
Two versions are av ailable. Standard model (T35) for am-
bient temperature –5 °C...+35 °C and the model for higher
temperature (T55) – 5 °C...+55 °C.
•
More details can be f ound in separate instruction for SEL
usage.
Typ e SEL 06-1 06-2
Input - 6 kA...+6 kA
U [V] 1000 2000
Ne
T35 for ambient temper ature of the breaker
-5 ° C...+35 ° C / +23 ° F...+95 ° F
T55 for ambient temper ature of the breaker
-5 ° C...+55 ° C / +23 ° F...+131 ° F
I Relating to the rated c urrent of the breaker
Ne
Output
U [kV] 12 18
Ni
10
06-4 12-1 12-2 12-4
-12 kA...+12 kA
4000 1000 2000 4000
4...20 mA
-20...20 mA
-10...10 V
40 12 18 40
Design and specifications are subject to change without notice
3.2.13 Electronic control system
All the control PCBs are installed in control box [Fig. 18]. Start-
ing f rom the left, these are:
Fig. 18 Control box with control units
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(1) NEKO control unit [Fig. 19-1] (Code 12) – internal con-
trol unit with capacitor bank. Releases firing signal for ED
coil (-X2 :10/:11) and provides indic ation of the capacitors
charging (-X3 :6/:7). NEKO control unit also blocks the fir-
ing signal until C-bank is fully c harged (~15 sec).
•
NEKO unit requires a high quality firing signal. Be sure,
that voltage level is between 6 V...24 V DC and there
are no short spikes on signal (<3 ms). This might lead to
major defect of the NEKO control unit!
Fig. 19-1 NEKO control unit
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(2) Internal voltage converter (Code 8) - converts external
supply voltage (-X3 :4/:5) to the internal 24 V DC. Required
by controls (except for the drive supply).
Fig. 19-2 Voltage converter 110 V/24 V DC.
S47183e rev.03 2009-09-02