RIV-3

Radio Interference Voltage (RIV) Testing

• The RIV meter is an instrument for the measurement of Radio Influence Voltage according to NEMA 107-1987 and other relevant standards (ANSI 63-2-1996, VDE 876, DIN EN 55016-1-1). The instrument has a bandwidth of 9 kHz and a tunable center frequency of 10 kHz-10 MHz. Technically, the RIV meter is a selective µV-meter. However, the meter reading is weighted according to the CISPRE weighing curve, whereas the repetition rate has a strong impact on the reading. The RIV meter is an ideal instrument to replace outdated RIV measurement instruments in transformer testing labs.
• Some routine PD measurements are still done according to IEEE standards requiring the measurement of RIV. The RIV value is given
  in µV (interference voltage). A narrow band filter performs a quasi-integration of the PD pulses with a quasi-peak detection at the center frequency. This center frequency can be adjusted between 10 kHz and10 MHz.
• The calibration of the RIV measurement is done using an RIV calibrator, injecting a sine wave of typically 100 µV into the bushing. The multiplexer of the RIV meter is used to conveniently determine the correction factor according to NEMA 107-1987 and other standards. Here, the unit compares the voltage injected (loaded by the bushing’s impedance), with the voltage detected at the bushing tap to automatically determine the k-factor. This correction factor is then stored independently for each channel during calibration. The standard calibrator for RIV calibration, CAL3A, offers a selectable frequency
  range of 600-1350 kHz in steps of 50 kHz. The output voltage covers 10 µV to 10 mV in 1-2-5 steps.