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The most reliable method for determining the potential risk of personal injury is the step and touch voltage approach.
To measure step and touch voltage, an overhead line or cable is typically used to feed current into a remote grounding system to form a voltage dip. Touch voltages can then be measured on the fencing surrounding the respective substation or other potential contact danger areas. To date, these measurements have generally been made with precise or approximate line frequency. This made suppression of line frequency interference complex and costly, since the faults are not necessarily constant over time.
The innovative measuring system developed by OMICRON is capable of outputting very high power and generating signals outside the line frequency range. The results are accurate measured values. Potential faults can be found and eliminated extremely accurately as per CENELEC HD 637 S1 or IEEE 80-2000, IEEE 81-1983 and IEEE 81.2-1991, while any touch voltages that occur can also be accurately measured. In many cases, the cost of performing this measurement is significantly lower than measuring voltage dips.
Learn more about OMICRON's solutions in the area of Step & Touch Voltage Measurement
CPC 100 + CP CU1 - Multifunctional primary testing system
Multifunctional primary testing system CPC 100 + CP CU1
OMICRON’s variable-frequency CPC 100 is ideally suited to performing the most diverse measurements on power transformers, current and voltage transformers and many other systems.
With the CP CU1 coupling unit, test currents at different frequencies than the line frequency can be fed into overhead cables, grounding cables or also conventional testing cables. Using existing cables allows the costs associated with measurement to be significantly reduced. The step and touch voltage are measured with the battery-operated frequency-selectable Voltmeter CP AL1 at random locations in the system. Line frequency faults are suppressed efficiently by more than 60dB (factor 1000).