5SHX10H6004 3BHB003230R0101 5SXE05-0152 High Voltage Variable Frequency Control Board

5SHX10H6004 3BHB003230R0101 5SXE05-0152 High Voltage Variable Frequency Control Board

Snubber Circuit and Optical Triggering:

• Each device level incorporates a relatively large RCD (Resistor-Capacitor-Diode) snubber circuit to ensure the capability to switch off 3700A under all circumstances.
• The trigger signal for the switch is optical, and it is split in the light distribution box to simultaneously trigger all three IGCT driver units.
• Each driver unit has an optical status output for monitoring the trigger function and detecting device failures, such as gate-cathode shortage.

Stack Assembly:

• All components, except the power supply and light distribution box, are assembled in one stack.
• The stack is built-up in a glass-fiber epoxy clamping system, providing flexibility in mounting positions within the modulator.
• The clamping force on the devices is 40kN, ensured by a bellville spring pressure pack.
• Ni-plated copper blocks between the devices serve as spacers, snubber support, and contribute to cooling.

Cooling and Power Loss:

• Due to the low pulse repetition rate of 2 Hz, power losses under normal operation are below 100W per device.
• Cooling is achieved by air convection.

Weight and Dimensions:

• The total weight of the switch, excluding the light distribution box and power supply, is approximately 50 kg.
• Overall dimensions are 360 x 625 x 470 mm.

Assembly Details (Figure 5 and Figure 6):

• Figure 5 displays the dimensional drawing of the switch assembly.
• Figure 6 illustrates inductive couplings with input transformers (blue) for powering the driver units.
• The high voltage cable (white) is sloped through the input transformers and connected to the current source power supply.
• In case of auxiliary power failure at the closed-loop current source power supply, the power supply can still charge the driver units for a switch-off.

These details emphasize the robust design of the switch, addressing cooling, weight considerations, and ensuring reliability through features like snubber circuits and optical triggering. The modular assembly in a glass-fiber epoxy clamping system allows for versatility in installation within the modulator.