The vv wiring method is suitable for systems where the neutral point is not grounded or grounded via the arc suppression coil. It has the advantage of saving one single-phase voltage transformer and reducing the grounding current in the system to avoid overvoltage. Two transformers are connected to the phase voltages Uab and Ubc, respectively. However, the primary winding cannot be grounded. For safety reasons, the secondary winding of phase B is grounded. This type of wiring can only obtain the line voltage and the phase voltage relative to the neutral point of the system, and the relative ground voltage cannot be obtained.
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