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NOISE ASSESSMENT FOR SUBSTATION PREVENTIVE MAINTENANCE AND OIL CABLE
MAINTENANCE
Hisham GhunaimOccupational Health and Safety
Specialist
Photo of Speaker/Author
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Content
• Introduction
• METHODS AND DATA COLLECTION
• RESULTS AND DISCUSSION
• Recommendations and Noise Control
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Introduction
• Substation Preventive Maintenance activities:
• Switching Operations at Jabriya-Z 400 kV Substation
• SF6 Gas handling SLWT- A 132 kV Substation
• Oil Cable Maintenance activities:
• Oil Flushing at Salwa B 132 kV substation and
University A 132 kV substation
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Introduction
• Substation Preventive Maintenance Health risk,
affected people & noise exposure sources:
• Employees exposed to breaker maintenance
& spring charging operation activities
(switching operations)
• Employees exposed to SF6 gas handling
machine
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Introduction
• Employees exposed to SF6 gas handling machine
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Introduction
• Oil Cable Maintenance:
• Employees exposed to degasifying unit that
include degasifying unit pump & vacuum
Vacuum
Pump
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METHODS AND DATA COLLECTION
𝐋𝑬𝑷,8 = 10 𝑳𝒐𝒈10
σ𝒊=1𝒏 ቀ𝒕𝒊 × 100.1 (𝑳𝑨𝒆𝒒,𝑻)𝐢
8
L𝐸𝑃,8 is the equivalent sound exposure level in 8 hours;
i is a discrete activity of a worker exposed to a sound level;
ti is the duration in hours of i;
(𝑳𝑨𝒆𝒒, 𝑻)𝐢 is the equivalent continuous A-weighted sound pressure level that represents
the sound the person is exposed to during period i
n is the total number of discrete activities in the worker’s total workday
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METHODS AND DATA COLLECTION
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RESULTS AND DISCUSSIONSwitching Operations
Sound Level Meter Dosimeter
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Data Source Lc peak LAeqRecording time (h)
Actual Duration
(h)
Daily Exposure (Lep,d)
Sound Level Meter
125.9 82.6 0.165 0.5 -
Dosimeter 123.3 74.8 1.38 6 73
RESULTS AND DISCUSSIONSwitching Operations
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RESULTS AND DISCUSSIONSF6 Gas Machine Handling
Sound Level Meter Dosimeter
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RESULTS AND DISCUSSIONSF6 Gas Machine Handling
Data Source Lc peak LAeqRecording time (h)
Actual Duration (h)
Daily Exposure (Lep,d)
Sound Level Meter
106.7 81.4 0.15 5 79
Dosimeter 116.8 81.9 1.27 5 80
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RESULTS AND DISCUSSIONOil Cable Maintenance
University A Salwa B
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RESULTS AND DISCUSSIONOil Cable Maintenance
Location LAeqRecording time (h)
Actual Duration (h)
Daily Exposure (Lep,d)
University A 73.9 0.91 5 72
Salwa B 78.6 2.28 5 76
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Recommendations and Noise Control
Oil Cable Maintenance
• Vibration damping of pumps used in trucks (i.e. degasifying units) to
reduce vibration levels & consequently result with significant noise
reductions.
• Opening both doors instead of one (see Figure 3) in the truck during
operation would significantly reduce the noise level reflection.
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Recommendations and Noise Control
Common Controls
• Conduct noise awareness and NIHL training sessions for all working groups with exposure
to identified potential health risks.
• Use of adequate hazard warning signs in high- risk exposure zones.
• Provision and use of suitable hearing protection equipment appropriate to the exposure
level with sufficient attenuation ratings.
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Recommendations and Noise Control
Preventive Maintenance
• Minimize personnel exposure at peak operational times by either introducing job
rotations or restriction of access in hazard vicinity zones.
• Regular maintenance of gas handling machines and improving the vibration damping of
pumps.
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Acknowledgements
The author sincerely acknowledges Kuwait ABB Engineering
Technologies Co., represented by Eng. Kareem Gabry (the Country
HSE manager), for all the support and the expertise provided during
the execution of this work. The author would also like to thank Eng.
Adel Younis for the constructive feedback.
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Thanks and Questions