High Speed DC Circuit Breaker - G E Power Controls
High Speed DC Circuit Breaker - G E Power Controls
High Speed DC Circuit Breaker - G E Power Controls
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Position’s indicator<br />
Drive’s rod<br />
Fig. 13 Position indicator<br />
Knob<br />
Side protection<br />
Control cover box<br />
Closing drive<br />
Fig. 16 Solenoid closing drive and control box<br />
• In addition, the switch-in mechanism is electrically<br />
blocked for approximately 8sec. or 14sec. after activation<br />
(see Table 2a “Activating magnet”). This prevents<br />
premature activation following a short circuit.<br />
Fig. 14 OCT indicator<br />
3.2.12 Current measurement system (code nr: 6)<br />
• The SEL current measurement system consists of the<br />
sensing component (1) and signal-processing unit (2)<br />
[Fig.17]. SEL sensor is integrated into a specially shaped<br />
upper terminal of the breaker and is connected by a<br />
shielded cable to the signal-processing unit. SEL control<br />
unit is placed in the control-box [Fig. 18].<br />
Fig. 15 Arc chute indicator<br />
3.2.11 Solenoid closing drive (code nr: 3)<br />
• For normal closing operations, the breaker is fitted with<br />
a high power solenoid coil. The drive is mounted at the<br />
front of the breaker and is equipped with a grounded<br />
casing.<br />
• Closing drive is supplied independently from other controls<br />
(-X2 :1/:2), and directly from power source. Voltage<br />
level shall be defined at the order. Rated power depends<br />
of breaker type is between 1,8kW and 2,6kW.<br />
• CLOSING command is enable by potential free contact<br />
at (-X2 :4/:5) the signal durations shall be ~300ms.<br />
• The closing drive system always includes a self-interrupt<br />
control circuit (SU unit). This circuit enables a short activation<br />
with a time of ~150ms. SU unit switches power to<br />
the solenoid and automatically switched it off after<br />
~400ms.<br />
• SU unit prevents also repeated drive activation (antipumping),<br />
during continuous operation, due to an existing<br />
short circuit.<br />
(1) SEL sensor<br />
(2) SEL control<br />
unit<br />
Fig. 17 SEL current measurement system<br />
• SEL may be used for recording <strong>DC</strong> currents in selected<br />
measurement ranges of 6kA or 12kA. Measurement of<br />
rated current values and of the current rise may now be<br />
made directly at the breaker.<br />
10 Design and specifications are subject to change without notice S47183-e 01/2008
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