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Discharge Judgments (When Incorporating Model ST9000)
5.4
Discharge Judgments (When Incorporating
Model ST9000)
Noise manifesting at a fixed level in the overall waveform among the high-frequency components
manifesting in the test waveform is eliminated, and only the amount of the partial discharge
components manifesting locally are sampled and judged.
Discharge judgments are enabled only when the Model ST9000 Discharge Detection Upgrade
(optional when shipped from factory) has been incorporated.
IMPORTANT
Discharge detection upgrade eliminates simple noise such as flutter and Laplacian operations that are
difficult to separate using primary and secondary differential operations using filtering. This way, you can
detect the partial discharge components with high precision.
Discharge judgment algorithm (when judgments are AUTO)
Test waveform HPF and standardization
processing
Compensation processing
Judgment processing
• The high-frequency discharge components of the test waveform
are sampled by separating them from the vibration waveform
components.
• Standardization using the standard deviation of the high-frequency
components
(In order to enable size comparison of the regular noise
components)
The compensated standardization waveform is used to judge
whether or not the max. deviation value has exceeded the
threshold value (
σ
value).
Compensating the distortion part of the test waveform
Gray waveform: Discharge amount graph
(Parts where the discharge amount exceeds
the threshold value are displayed in red)
Test waveform
Discharge waveform
Green dotted line: Discharge judgment
threshold value bar
IMPORTANT
The Discharge Detection Upgrade calculates the internal coefficient, etc., used for judgments during voltage
calibration. Consequently, make sure to set the discharge judgment method before implementing voltage
calibration.
If voltage calibration is not implemented, the discharge amount is not calculated even if the judgment setting
is other than OFF.
Содержание ST4030
Страница 2: ......
Страница 14: ...6 Usage Notes ...
Страница 32: ...24 Inspecting before Measurement and Verifying Operations ...
Страница 42: ...34 Table Copying ...
Страница 108: ...100 Setting Dielectric Break down Judgment Conditions ...
Страница 132: ...124 Terminal Open Error Setting ...
Страница 198: ...190 Editing Files and Folders ...
Страница 214: ...206 Interface Specifications ...
Страница 237: ...229 Dimensions Diagram 15 4 Dimensions Diagram Unit mm 215 1 348 3 178 0 5 285 6 0 5 200 1 13 40 3 1 15 3 1 15 Appendix ...
Страница 248: ...240 Precautions when Processing Test Leads ...
Страница 252: ...244 Index ...
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