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The basic valve firing scheme .The valve control generates firing signals. Each thyristor level receives the signal directly from a separate fibre-optic cable. Thus each thyristor level is independent, sharing only a duplicated light source at the group potential.
The valve control unit also includes many monitoring and protective functions. The return pulse system coupled with short pulse firing scheme is used in present day valve control units. A separate light guide is used to send a return pulse whenever the voltage across a thyristor is sufficient and the power supply unit is charged. If at that time, firing pulse are demanded from the valve control, the light signals are sent to all thyristor control units simultaneously.
During normal operation, only one set of light pulses are generated in a cycle for each valve, However, during operation at low direct currents, many light pulse are generated due to discontinuous current.
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