Preventive Maintenance of Substation
Remaining service life estimation services for high voltage distribution panels
High humidity insulation characteristics are measured and the service life of the panel is evaluated.
Device overview
A high humidity space is created on-site and the surface insulation characteristics in that space are measured.
Remaining service life estimation for insulators
Measurement target
Support insulator for aging high voltage distribution panels
Organic insulating materials such as in high-voltage circuit breakers
Vacuum circuit breaker (VCB) interphase barrier
Manual motor controller (MMC) busbar support
On-site measurement method
Remaining service life estimation method
＜Initial setting＞
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ρ0：
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Initial value of surface resistivity
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ρn：
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Lower limit of usage of surface resistivity
(Partial discharge occurred at operating voltage)
＜On-site measurement＞
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t1：
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Elapsed years at time of measurement
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ρ1a：
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Surface resistivity before cleaning
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ρ2a：
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Surface resistivity after cleaning
＜Approximate curve of deterioration progress＞
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Without cleaning:
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ρa(t)=ρ0/tα
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With cleaning:
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ρb(t)=ρ1b/(t－t1)α
Flow of diagnosis
1.＜Preliminary survey and preparation＞
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Nameplate items (rated voltage, year of manufacture)
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Measurement location, Target selection
2.＜On-site Measurement＞
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1.
Sensor mounting (20 minutes)
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2.
Data acquisition (30 minutes)
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3.
Device removal (10 minutes)
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Note
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Procedures 1 to 3 are performed for each of the required number of units to be measured.
3.＜Diagnosis report＞
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Remaining service life with and without cleaning
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Calculation of the remaining service life years with a variable cleaning cycle
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Proposal of maintenance and update plans
Important notes about using these services
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Contact our company's representative to discuss the selection of the insulation to be measured.
(There is a possibility that sensors cannot be mounted because the target object needs to be stationary for the measurement.) -
Notify us of the assumed upper limit of the humidity in the environment where the power distribution panel is installed.
(The local surface resistance is measured according to the assumed upper limit of humidity.) -
Deterioration cause factors cannot be determined only from the results of this test.
(Each degree of influence of contamination and base deterioration can be evaluated. Inquire separately about the cause of the deterioration.)
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