Section 5
1MAC050144-MB C
Protection related functions
400
615 series ANSI
Technical Manual
Figure 198:
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.
Figure 199: Validation of HIZ on gravel
Figure 200: Validation of HIZ on concrete
Figure 201: Validation of HIZ on sand
Figure 202: Validation of HIZ on grass
Содержание 615 Series ANSI
Страница 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
Страница 2: ......
Страница 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Страница 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Страница 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
Страница 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
Страница 712: ......