A "ring wave" is the waveform resulting from a transient event in a resonant circuit. If there is enough energy stored in capacitive and inductive circuit elements to overcome the energy lost in the circuit resistance, a transient will cause the circuit will oscillate in an exponentially decaying sine wave, not unlike the ringing of a bell.
Comment: Nowadays with the widespread use of Variable Speed Drives (VSD), Variable Frequency Drives (VFDs), etc. that are using fast switching devices, e.g. Insulated Gate Bipolar Transistor (IGBTs) or Integrated Gate Commutated Thyristors (IGCTs), ringing phenomena occurs. It introduces high frequency oscillations and travelling waves in cables that tend to reflect and build up voltage.
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