• Raptor HV is required by using its voltage output in the 1000 V range and the measurement capabilities of the Raptor Master unit
• The function requires the use of the optional Step & Touch accessories kit
• Step & Touch Voltage characteristics of the protective earthing installations in substations and other electrical facilities

For measuring the step & touch voltage characteristics of the protective earthing installations in substations and other electrical facilities, the Raptor HV is required by using its voltage output in the 1000 V range and the measurement capabilities of the Raptor Master unit. This Function requires the use of the optional Step & Touch accessories kit.

The measurement is performed between two ground points at a distance of 1 m as shown on Fig. The 25 kg measuring probes/electrodes simulates the feet. The voltage between the probes is measured by a voltmeter with an internal resistance of 1 kΩ that simulates the body resistance.

The measurement is performed between an earthed accessible metal part and ground as shown on Fig.

The voltage between the probes is measured by a voltmeter with an internal resistance of 1kΩ that simulates the body resistance.

This function use the timer as countdown timer (default 20 sec), and have three phases which take place automatically without user intervention (each phase consume a third of the timer):

• Phase 1. The Raptor‐HV injects 0VAC and obtain step & touch voltage generated by currents outside the Raptor, "Vo".
• Phase 2. The Raptor‐HV inject voltage configured in setting, in phase with the line, and get the step & touch voltage generated by the same and those currents outside the Raptor "V +".
• Phase 3: The Raptor‐HV inject voltage configured in setting, in opposite phase to the line, and get the step & touch voltage generated by the same and those currents outside the Raptor "V ‐ ".

Finally, it is calculated the Vst & tch, at the configured Isc (shortcircuit current of the grid under test), which is selected in the settings.

NOTE: This paper is not intended as a user manual, but a summary of main functions included by default in the Raptor System for purchase evaluation. At the time of using the equipment, always consult the appropriate user manual, especially regarding safety precautions and dangers actions which must be carefully observed.