ABB 615 series Technical Manual page 797

Hide thumbs Also See for 615 series:

Table of Contents

1MAC059074-MB A

615 series ANSI

Technical Manual

GUID-82695BC5-1E26-4AF4-97D9-252671CF972F V1 EN

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

Validation of HIZ on gravel

Protection related functions

GUID-B9AC5923-6A67-431B-A785-171FD132E1A6-ANSI V1 EN

Validation of HIZ on

Chapters

Table of Contents