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Connection
Operation with coupling device AGH204S-4
AC systems with rectifi ers
The maximum DC voltage is the voltage permitted to occur in the AC part
of the system to PE, if the IRDH375 is coupled with AGH204S-4. This voltage
is dependent on the level of the nominal voltage, the type of rectifi cation
(6 pulse, 12 pulse,...), the type of inverter intermediate circuit (current...
or voltage..) and the inverter technology. The voltage of voltage-controlled
converters usually is equivalent to the phase-to-earth voltage of the AC supply
voltage multiplied by 1.414.
In the case of current-controlled intermediate circuits there may be higher DC
voltages.
The given voltage values for AC/DC systems are based on experience (factor
1.414 between DC voltage and AC voltage).
When an insulation fault occurs in the DC part of the system, e.g. in the
inverter intermediate circuit, the maximum voltage is DC 1840 V. From this, the
maximum AC voltage is calculated:
Umax = DC 1840 V / 1.414 = AC 1300 V
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