PLC module 3BHB020720R0002 5SHY3545L0016 3BHB006943R0001 UNS0885A-Z,V1 IGCT MODULE In Stock
Faulty IGCTs can be found by the three LEDs mounted on the gate unit. The gate unit has to be switched on and must not receive a trigger signal. This means, before checking the LEDs, the fault must be reset.
IMPORTANT! Before resetting the alarm, "PCS6000 HMI" has to be checked for any additional trips or alarms. Any trips or alarms need to be noted down before resetting.
The yellow LED indicates the state of the internal voltage controller (20 VDC) and the green LED gives information about the state of the gate-cathode circuit of the IGCT. The red LED indicates a general malfunction.
features
· High snubberless turn-off rating
· Optimized for medium frequency
· High electromagnetic immunity
· Simple control interface with status feedback
· AC or DC supply voltage
· Option for series connection (contact factory)
The secret of the GCT The key to success was in the GTO itself. More precisely, the only thing wrong with it was an enormous control problem. A typical turn-off response is shown in Fig. 1. Because of the demand for high turn-off amplification, the GTO passes through a region during the transition from the conducting (thyristor) to the non-conducting (transistor) states when both anode voltage and cathode current are impressed (red background). As with a mechanical switch, however, a four-layer device can only assume one of two stable states - on and off. The transition tends to instability and has to be got through as quickly as possible and be supported by snubber
Characteristics of the IGCT
The characteristics targeted in the IGCT development programme were achieved in steps that closely resembled the approach adopted for the IGBT. The development goals were:
• Improved GTO switching characteristics for operation without dv/dt snubbering at high current density
• Reduced on-state and turn-off losses through minimization of the silicon thickness
• Reduced gate-drive requirements, especially during conduction
• Development of anti-parallel diodes capable of snubberless turn-off at high di/dt
• High-frequency operation for continuous and dynamic conditions
• Integration of main switches (GTO thyristor and diode) in one semiconductor package
For high-power applications some additional characteristics were necessary:
• Enhanced reliability per MVA by reducing the complexity and number of components
• Extension of the power range to several 100 MVA by means of cost-effective, reliable series and parallel connection
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