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Figure 399: Block diagram of HIZ
HIZ is based on algorithms that use ground current signatures which are considered non-
stationary, temporally volatile and of various burst duration. All harmonic and non-
harmonic components within the available data window can play a vital role in the high-
impedance fault detection. A major challenge is to develop a data model that
acknowledges that high-impedance faults could take place at any time within the
observation window of the signal and could be delayed randomly and attenuated
substantially. The model is motivated by extensive research, actual experimental
observations in the laboratory, field testing and what traditionally represents an accurate
depiction of a non-stationary signal with a time-dependent spectrum.
GUID-61D297F5-783F-4CF2-BD16-18CE537C9E95-ANSI V1 EN
Figure 400: Validation of HIZ on gravel
GUID-B9AC5923-6A67-431B-A785-171FD132E1A6-ANSI V1 EN
Figure 401: Validation of HIZ on
concrete
1MAC059074-MB A Section 5
Protection related functions
615 series ANSI 791
Technical Manual
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