ERGON ENERGY CORPORATION LIMITED
ACN 087 646 062
Noise Assessment for
Proposed Dartmouth Street
Zone Substation
August 2011
Prepared by: Brendon Sippel (Ergon Energy - Substation Design
Southern)
Approved by: Ben Hayes
DWG: 1021272-01
DWG: 1021272-01
Document History
Version
Date
1.0
August 2011
1.1
September 2011
Details
Author
Draft
B. Sippel
Approved by B. Hayes
B Sippel
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
Page 2 of 22
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Table of Contents
1
Executive Summary .............................................................................................5
2
Introduction ..........................................................................................................6
3
Noise Criteria .......................................................................................................7
4
3.1
Environmental Protection (Noise) Policy 2008......................................................... 7
3.2
ecoaccess Noise Guideline...................................................................................... 7
3.3
SCEMG Criteria........................................................................................................ 7
3.4
Australian Standard AS 1055.1-1997 ...................................................................... 7
3.5
Australian/New Zealand Standard AS/NZS 2107:2000 ........................................... 8
3.6
Component Noise Level Limit .................................................................................. 8
Ambient Noise Survey..........................................................................................9
4.1
Introduction............................................................................................................... 9
4.2
Noise Sensitive Receptors ....................................................................................... 9
4.3
Meteorological Conditions........................................................................................ 9
4.4
Measuring Equipment .............................................................................................. 9
4.5
Measurement Locations......................................................................................... 10
4.6
Ambient Sound Levels ........................................................................................... 10
4.7
Assessment Noise Level........................................................................................ 11
6
Substation Noise Sources ..................................................................................12
7
Noise Model .......................................................................................................14
7
Conclusions........................................................................................................19
Appendix A: Noise Logger Data.................................................................................20
Appendix B: Hervey Bay, Queensland Daily Weather Observations for 22nd of July to
29th of July 2011........................................................................................................22
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
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Table 1: Noise Criteria for New Plant / Facilities ....................................................................... 7
Table 2: AS2107:2000 Recommended Design Sound Level for Inside Residential Buildings . 8
Table 3: Attended Background Noise Measurements............................................................. 10
Table 4: Assessment Background Levels ............................................................................... 11
Table 5: Assessment Noise Levels ......................................................................................... 11
Table 6: Transformer Noise Test Results................................................................................ 12
Table 7: Air Conditioning Specifications.................................................................................. 13
Table 8: Fujitsu Air Conditioner Outdoor Unit Measured Sound Pressure Levels .................. 14
Table 9: Worst Case Sound Pressure Levels for different noise model arrangements .......... 16
Figure 1: Location of proposed Dartmouth Street Substation .................................................. 6
Figure 2: Noise sensitive receptors surrounding proposed...................................................... 9
Figure 3: Measurement Locations. ......................................................................................... 10
Figure 4: Graph of octave sound pressure levels for Fujitsu Air Conditioner......................... 15
Figure 5: Isometric View of Dartmouth St Noise model (indicative only). ............................... 16
Figure 6: Dartmouth St noise model with one fully loaded transformer (With TF noise wall). 17
Figure 7: Dartmouth St noise model with two half loaded transformers (With TF noise wall). 17
Figure 8: Dartmouth St noise model with one fully loaded transformer (With timber fence on
Western boundary). ................................................................................................................. 18
Figure 9: Dartmouth St noise model with two half loaded transformers (With timber fence on
Western boundary). ................................................................................................................. 18
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
Page 4 of 22
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1
Executive Summary
Ergon Energy proposes to construct a Z6-32 indoor zone substation at the corner of
Dartmouth Street and Boat Harbour Drive in Hervey Bay. An assessment in relation
to operational noise (not construction noise) has been undertaken including:
•
•
•
•
Establish appropriate noise criteria for the proposed Dartmouth Street
zone substation;
Determine the existing noise conditions;
Model proposed substation noise levels; and
Recommend mitigation measures.
It was determined that the most suitable criterion for assessment was with respect to
existing ambient levels: the component noise level from the proposed substation
should not exceed the existing background noise level. At worst this results in a total
noise level of background plus 3dBA therefore adhering to the SCEMG (supply
corporations environmental management group) Guideline C5. The component
noise level is adjusted by 5dBA for tonality as per AS 1055.1-1997. The
Environmental Protection (Noise) Policy 2008 and the AS/NZS 2107:2000 standard
(Acoustics – Recommended design sound levels and reverberation times for building
interiors) were also considered in the assessment.
A survey of ambient noise levels was conducted between the 22nd to the 29th of July
2011. The survey consisted of both attended and unattended noise measurements.
A Rating Background Level (RBL) of 31.9 dB(A) was determined for the night time
period, which equates to a substation component noise level of 26.9 dB(A) with
tonality correction.
Noise levels were modelled for property boundaries under different transformer
loading scenarios and with different noise mitigation techniques employed. From this
analysis it is recommended that either of the following is recommended:
Option 1: Noise wall along the southern, western and northern side of the
transformer area.
Option 2: Timber panelled fence along the western boundary of the substation yard.
As part of the public consultation process, it was decided that both a transformer
noise wall and timber panelled fence would be used for noise and visual abatement.
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
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2
Introduction
Ergon Energy proposes to construct a new 66/11kV zone substation at the corner of
Boat Harbour Drive and Dartmouth Street in Hervey Bay.
As part of the environmental impact assessment for this site a noise assessment is
required. The purpose of this report is to investigate the existing noise conditions
and noise receptors, determine relevant noise criteria, predict proposed substation
noise levels, and recommend potential noise mitigation measures if necessary.
North
Proposed Dartmouth St Zone Substation
Figure 1: Location of proposed Dartmouth Street Substation
The substation will be a Z6-32 indoor configuration and have provision for the
following:
•
•
•
•
•
Two 66kV to 11kV 32MVA transformers;
Four indoor 66kV feeder bays and gas insulated 66kV bus and switchgear;
Control building which also contains 11kV indoor switchboard and indoor
66kV gas insulated switchgear;
Provision for up to twelve outgoing 11kV distribution feeders; and
Provision for up to two 6MVAr capacitor banks.
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
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3
Noise Criteria
3.1
Environmental Protection (Noise) Policy 2008
The Queensland Environmental Protection (Noise) Policy 2008 applies to
Queensland’s acoustic environment. The policy specifies the acoustic quality
objective of achieving an ambient level of 50dBA* for dwelling (outdoors) and 30dBA
for dwelling (indoors – night-time) for health and wellbeing and in relation to the
ability to sleep.
3.2
ecoaccess Noise Guideline
The Environmental Protection Agency (EPA) ecoaccess Noise Guideline considers
the criteria of the Environmental Protection Act 1994 and tabulates noise limits for
planning purposes. A clause on the first page of this Guideline states that it is not
suitable for use where the frequency spectra of some noise sources are dominated
by frequency content below 200 Hz. Power transformers are dominated by
frequency content less than 200 Hz and therefore the ecoaccess Noise Guideline will
not be considered further in this report.
3.3
SCEMG Criteria
The Supply Corporations Environmental Management Group (SCEMG) includes
environmental representatives from the following organisations:
•
•
•
Energex;
Ergon Energy; and
Powerlink Queensland
The SCEMG has developed Guideline C5: Noise Management, and the noise criteria
as per this Guideline (Table 1) can be used in the assessment of substation noise.
Table 1: Noise Criteria for New Plant / Facilities
Time of Day
Maximum Noise Level for Steady State Noise
Noise Sensitive Place
Commercial Place
Industrial Place
0700 hrs – 2200 hrs
Background + 5 dB(A)
55 dB(A)
65 dB(A)
2200 hrs – 0700 hrs
Background + 3 dB(A)
55 dB(A)
65 dB(A)
3.4
Australian Standard AS 1055.1-1997
AS 1055.1-1997 (Acoustics – Description and measurement of environmental noise)
details procedures for measuring environmental noise. This standard states that if
tonal components are clearly audible the measured A-weighted sound pressure level
shall be adjusted by 5dB. As transformer noise has a clearly audible tonal
characteristic a +5dBA adjustment to the modelled noise level will apply.
*
LAeq,adj,1hr means the A-weighted sound pressure level of a continuous steady sound, adjusted for tonal character,
that within a 1 hour period has the same mean square sound pressure of a sound that varies with time.
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
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3.5
Australian/New Zealand Standard AS/NZS 2107:2000
The AS/NZS 2107:2000 standard (Acoustics – Recommended design sound levels
and reverberation times for building interiors) tabulates recommended ambient sound
values for building interiors. Table 2 shows the recommended design levels for
inside residential buildings.
Table 2: AS2107:2000 Recommended Design Sound Level for Inside
Residential Buildings
Recommended design sound level,
LAeq†, dBA
Satisfactory
Maximum
Houses in areas
with negligible
transportation
Houses and
apartments near
minor roads
Houses and
apartments near
major roads
3.6
Sleeping Areas
Living Areas
Sleeping Areas
Work Areas
Apartment common
areas (e.g. foyer, lift,
lobby)
Living Areas
Sleeping Areas
Work Areas
Apartment common
areas (e.g. foyer, lift,
lobby)
25
30
30
30
35
40
35
40
45
55
35
30
35
45
40
45
45
55
Component Noise Level Limit
The noise model only calculates noise level from the proposed development and not
existing background conditions. This modelled noise level is referred to as the
component noise level. It is recommended that the modelled component noise level
in this instance (increased by 5dBA for the tonality adjustment) not exceed the
existing night time background level. At worst this results in an overall increase of
3dBA above the background noise level therefore adhering to the SCEMG Guideline
C5.
†
LAeq is an A-weighted sound pressure level of a continuous steady sound that has the same mean square sound
pressure as a sound level that varies with time.
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
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4
Ambient Noise Survey
4.1
Introduction
A survey of ambient noise levels was conducted from the 22nd to the 29th of July
2011. The survey consisted of both attended and unattended noise measurements.
4.2
Noise Sensitive Receptors
Figure 2 shows the location of the residential premises located to the East and the
vacant land to the West and North of the Dartmouth St Substation site.
Dartmouth St
Substation
Major Road
residential
homes ~40m
Figure 2: Noise sensitive receptors surrounding proposed
Dartmouth St zone substation.
4.3
Meteorological Conditions
Daily weather observations for Hervey Bay during the time the noise measurements
were taken are shown in Appendix B.
4.4
Measuring Equipment
The following measuring equipment was used:
• Rion NL-32 Type 1 Sound Level Meter + windshield;
• Outdoor all weather logging kit; and
• Pulsar 106 Acoustic Calibrator
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
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4.5
Measurement Locations
Figure 3 shows attended and logger measurement locations.
were taken at a height of 1.2m with the windshield installed.
All measurements
Attended
Measurements
(Location 2)
Attended
Measurements
(Location 1)
Logger
(substation site)
Figure 3: Measurement Locations.
4.6
Ambient Sound Levels
The noise sources noted during attended measurements included:
• Constant road traffic noise along Boat Harbour Drive;
• birds;
• rustling leaves;
Table 3 shows attended background noise measurements and unattended noise
logger measurements are shown in Appendix A. Assessment Background Levels‡
(ABL) and Rating Background Levels§ (RBL) for Day, Evening, and Night time
periods, as determined from noise logger data, are shown in Table 4.
Table 3: Attended Background Noise Measurements
Location
1
2
Beginning
Time
Measuring
Time
29 July 2011
10:35
29 July 2011
10:28
0:05:00
0:05:00
Lmin (dBA)**
Lmax
(dBA)††
L90
(dBA)‡‡
64.1
76.8
51.3
59.6
76.4
50.8
‡
Assessment background level is the single figure representing each assessment period – day, evening, night.
Determined using ecoaccess guideline methodology.
§
Rating Background Level is the overall single figure background level representing each assessment period
(day/evening/night) over the whole monitoring period.
**
Lmin is the minimum time-weighted sound level encountered during the measurement period.
††
Lmax is the maximum time-weighted sound level encountered during the measurement period.
‡‡
L90 is the sound level that was exceeded for 90% for the measurement time.
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
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Table 4: Assessment Background Levels
Date
Day ABL (dBA)
(7am-6pm)
Evening ABL (dBA)
(6pm-10pm)
Night ABL (dBA)
(10pm-7am)
22 July 2011
61.20
55.15
43.40
23 July 2011
58.27
50.84
35.15
24 July 2011
57.58
47.00
34.65
25 July 2011
59.73
46.70
29.90
26 July 2011
59.90
50.30
31.40
27 July 2011
60.03
49.65
30.35
28 July 2011
61.13
50.30
31.25
29 July 2011
61.35
-
32.35
Rating Background
Level (RBL)
60.0
50.3
31.9
4.7
Assessment Noise Level
The LAmax,adj,T§§ and the component noise level*** are shown in Table 5. The night time
value of 31.9 dB(A) is the target value as this represents the most stringent case.
The substation component noise level goal is 26.9dBA after tonality correction is
applied. The LAmax,adj,T includes noise from both the proposed substation plant and
the existing environment.
Table 5: Assessment Noise Levels
Time Period
LAmax,adj,T (dBA)
Component Noise Level (dBA)
Day
63.0
60.0
Evening
53.3
50.3
Night
34.9
31.9
Substation Goal
(tonality correction
applied)
§§
***
26.9
LAmax,adj,T: Maximum noise level from existing environment plus proposed substation noise adjusted for tonality.
Component Noise Level: Noise contributed from proposed substation in the absence of all other noise sources.
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
Page 11 of 22
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6
Substation Noise Sources
The significant noise sources at the proposed Dartmouth St substation include the
two 32MVA 66/11kV power transformers and the eleven air conditioning units for the
control building – three for the 11kV switchgear room, three for the 66kV switchgear
room and five for the control room. The reactors for the capacitor banks may also
generate noise however the capacitor cans and reactors will be fully enclosed in an
outdoor canopy so any noise contribution will be negligible. As the 66kV and 11kV
busbars and switchgear are indoors, any noise associated with their operation will be
negligible.
Table 6 shows results from a test report of a typical 66/11kV 32MVA transformer
from Wilson Transformers. Results are given for various loading, cooling type and
applied voltage scenarios.
Table 6: Transformer Noise Test Results
Load
(MVA)
Applied
Voltage (%)
19
100
32
100
19
110
32
110
Cooling Type
LwA (A-weighted Sound
Power Level) dBA
ONAN (oil pump off,
fan off)
ODAF (oil pump on,
fan on)
ONAN (oil pump off,
fan off)
ODAF (oil pump on,
fan on)
64.6
72.2
69.9
73.4
It is assumed that the air conditioners installed at Dartmouth St zone substation will
be similar to recent Z6-32 indoor installations. The recently constructed Berserker
zone substation has a similar control building arrangement to the proposed
Dartmouth St substation. At Berserker, there are eleven air conditioners installed.
The details of these units, in particular the outdoor unit noise levels, are shown in
table 7.
Not all of the air conditioning units will run all of the time. The switchgear room air
conditioning units are only used by personnel whilst on site for comfort cooling /
heating. The control room air conditioning is required to maintain the control room at
a stable temperature for the correct operation of control and protection gear. For the
purpose of modelling the substation noise component, four air conditioning units on
the control room will be modelled.
Author: Brendon Sippel – Substation Design Southern
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Noise Assessment for
Proposed Dartmouth St Zone
Substation
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Table 7: Air Conditioning Specifications†††
Model
Heating
Capacity
(kW)
Quantity
Installed at
Substation
FAQ100 /
RZQ100
10.0kW
11.2kW
Sound
Power
Level
(dBA)
65
FHQ125 /
RZQ125
12.5kW
14.0kW
66
3
FHQ125 /
RZQ125
12.5kW
14.0kW
66
3
†††
Cooling
Capacity
(kW)
5
Purpose
control
room air
conditioning
11kV
switchgear
room air
conditioning
66kV
switchgear
room air
conditioning
Air conditioning information obtained from Daiken product brochures – refer www.daiken.co.uk
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
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7
Noise Model
Due to load risk management one fully loaded transformer or two half loaded
transformers represent the worst case situations for substation operation. Therefore
these configurations will be modelled. Transformer noise sources are placed at a
height of 1.88m in the model to accurately represent 2/3 of the tank height (2.82m)
testing height as specified in the test report from Wilson Transformers. The noise
source was setup in such a way to assign an appropriate weighting of sound to
octave frequencies to ensure that the sound power level produced by the noise
source within the model matches the transformer under test.
The octave frequency breakdown information of air conditioner noise is not easily
obtained from manufacturers therefore a similar unit to those shown in table 7 was
measured to determine operational noise. Measurements were taken using the Rion
NL-32 sound level meter with the NX-22RT processing card installed to determine
octave band levels. The results of these measurements are shown in Table 8 and
Figure 4. The modelling of air conditioners in the Dartmouth St substation model
places noise sources at the approximate height they will be placed on the control
building exterior and uses scaled octave noise data from the measured Fujitsu unit
(Table 8) to achieve the sound power level specified from Daiken in table 7.
Table 8: Fujitsu Air Conditioner‡‡‡ Outdoor Unit Measured Sound Pressure
Levels
Frequency
(Hz)
All-pass
16
31.5
63
125
250
500
1000
2000
4000
8000
‡‡‡
§§§
Sound Pressure Level (dBA)
Measuring
Location 1
Measuring
Location 2
Measuring
Location 3
Measuring
Location 4
Measuring
Location 5
Measuring
Location 6
59.8
11.5
33.5
46.9
50.9
49.8
53.4
54.0
49.8
48.0
41.6
60.1
28.8
39.7
46.1
50.7
49.8
53.5
54.9
50.5
46.5
39.9
62.3
32.6
44.1
50.2
51.3
51.1
56.8
56.7
53.1
48.7
41.3
60.1
17.6
32.6
43.8
50.1
50.6
54.2
54.7
51.4
46.8
40.0
56.9
15.9
28.5
37.3
45.8
48.0
49.7
50.8
48.6
46.7
44.5
56.9
13.8
28.8
41.0
46.9
48.7
49.0
51.1
47.3
45.6
42.3
Average
Sound
Pressure
§§§
Level
60.0
26.6
38.3
46.0
49.7
49.8
53.5
54.2
50.5
47.2
41.9
Fujitsu air conditioner model no. A0T36LMADL 10kW heating and cooling capacity, LwA = 65dBA.
Average sound pressure level for each octave band was calculated using formula 3 from IEEE C57.136-2000.
Author: Brendon Sippel – Substation Design Southern
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Noise Assessment for
Proposed Dartmouth St Zone
Substation
Page 14 of 22
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70
60
50
40
30
20
10
8kHz
4kHz
2kHz
1kHz
500Hz
250Hz
125Hz
63Hz
31.5Hz
16Hz
0
AP
Avg. Sound Power Level (dBA)
Average Sound Pressure Levels for Outdoor Unit of 10kW
Fujitsu Air Conditioner
Centre Frequency
Figure 4: Graph of octave sound pressure levels for Fujitsu Air Conditioner.
Important points to note from the model development process include:
• DataKustik CadnaA V3.72.127 is the noise modelling software used ;
• worst case meteorological conditions were used in the model, for instance a
wind direction that promotes the highest sound pressure level at the closest
sensitive receptor was used;
• calculation standard is set to ISO9613;
• ground attenuation is set to ‘spectral, all sources’ to apply ground attenuation
calculations for all sources, even those have an emission spectrum
frequency;
• meteorological option is set to CONCAWE;
• ground absorption coefficient used for substation crushed rock is 0.1; and
• sound pressure level calculation height is 1.5m;
• vegetation buffers are not included in the model.
An Isometric view of the noise model is shown in Figure 5. The noise sensitive
property boundary is the eastern boundary (close to Dartmouth street residents). The
Northern and Western boundaries both front onto vacant land that could potentially
be developed in the future. A vegetation buffer will exist around the substation site
which will provide visual enhancement to the site. Depending on the make up of the
vegetation buffer, the vegetation may have some noise reduction effect. The
vegetation buffer has not been considered in the noise model so that a worst case
situation can be modelled.
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
Page 15 of 22
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Boat Harbour
Drive
Transformer
Noise wall
Noise Receiver
Transformers
Air Conditioner
Units
Control
Building
Dartmouth St
Figure 5: Isometric View of Dartmouth St Noise model (indicative only).
The model indicated that with no noise mitigation options in place, the component
noise level from the substation would be greater than the noise target level of
26.9dB(A) along the western property boundary.
The addition of a timber panelled fence on the western boundary of the substation
site reduces noise levels to an acceptable level.
Alternatively, a 4m high noise wall along the southern, western and northern side of
the transformer area also reduces the noise level to the west and north of the
substation to an acceptable level.
In all cases, the noise level along Dartmouth St near the existing residents is below
target levels. Table 9 outlines the expected noise levels at the sensitive areas with
various mitigation options in place.
Table 9: Worst Case Sound Pressure Levels for different noise model
arrangements
Model Arrangement
No Mitigation
4m high TF noise wall
Timber fence on all
boundaries
Timber fence on western
boundary
Highest Sound Pressure
Level dBA and (location) at
sensitive Property
Boundary for 1 Fully
Loaded Transformer
22.8 (Eastern Residents)
31.4 (Western Boundary)
22.9 (Eastern Residents)
25.4 (Western Boundary)
19.4 (Eastern Residents)
25.9 (Western Boundary)
22.8 (Eastern Residents)
26.5 (Western Boundary)
Highest Sound Pressure
Level dBA and (location) at
sensitive Property
Boundary for 2 half Loaded
Transformers
18.8 (Eastern Residents)
30.1 (Western Boundary)
20.8 (Eastern Residents)
25.2 (Western Boundary)
16.0 (Eastern Residents)
24.3 (Western Boundary)
18.8 (Eastern Residents)
25.7 (Western Boundary)
Note: Cells highlighted red indicate that the noise goal (26.9dBA) is not met and cells highlighted green indicate that
noise level is satisfactory.
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
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Wind Speed = 10m/s
Direction = W
Figure 6: Dartmouth St noise model with one fully loaded transformer (With TF
noise wall).
Wind Speed = 10m/s
Direction = W
Figure 7: Dartmouth St noise model with two half loaded transformers (With TF
noise wall).
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
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Wind Speed = 10m/s
Direction = W
Figure 8: Dartmouth St noise model with one fully loaded transformer (With
timber fence on Western boundary).
Wind Speed = 10m/s
Direction = W
Figure 9: Dartmouth St noise model with two half loaded transformers (With
timber fence on Western boundary).
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
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7
Conclusions
From the measurements and modelling conducted the following conclusions can be
drawn:
•
•
•
•
•
•
•
The required maximum component noise level, allowing for a 5dBA tonality
correction, from the proposed substation is 26.9dBA;
With no noise mitigation, the target component noise level from the substation
is not met at the western property boundary. The noise level on all other
property boundaries are within acceptable levels.
The installation of timber panelled fences along the western side of the
substation boundary will reduce the component noise level to a satisfactory
level at the western property boundary;
The installation of a transformer noise wall also reduces the component noise
level to a satisfactory level at the western property boundary.
Recommend either of the following noise mitigation techniques:
o Timber panelled fence along the western side of the substation yard.
o Noise wall along southern, western and northern side of transformer
area.
The Environmental Protection (Noise) Policy 2008, acoustic quality ambient
level of 30 dBA LAeq,adj,1hr is predicted to be achieved;
The noise level inside residential buildings is predicted not to increase due to
the substation development therefore there are no substation noise issues
under AS/NZS 2107:2000 (Recommended design sound levels and
reverberation times for building interiors).
During public consultation, both a timber panelled fence and transformer noise walls
were promised for both noise mitigation and to improve the visual aspects of the
substation. This resulted in the concept design including both the timber fence and
the transformer noise wall where only one is required for noise mitigation.
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
Page 19 of 22
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
11:44:12 PM
9:14:12 PM
6:44:12 PM
4:14:12 PM
1:44:12 PM
11:14:12 AM
8:44:12 AM
6:14:12 AM
3:44:12 AM
1:14:12 AM
10:44:12 PM
8:14:12 PM
5:44:12 PM
3:14:12 PM
12:44:12 PM
10:14:12 AM
7:44:12 AM
5:14:12 AM
2:44:12 AM
12:14:12 AM
Sound Pressure Level dB(A)
10:44:12 PM
8:44:12 PM
6:44:12 PM
4:44:12 PM
2:44:12 PM
12:44:12 PM
10:44:12 AM
8:44:12 AM
6:44:12 AM
4:44:12 AM
2:44:12 AM
12:44:12 AM
10:44:12 PM
8:44:12 PM
6:44:12 PM
4:44:12 PM
2:44:12 PM
12:44:12 PM
10:44:12 AM
Sound Pressure Level dB(A)
DWG: 1021272-01
Appendix A: Noise Logger Data
Noise Logger Data 22 and 23 July 2011
80
70
60
50
LAE
40
LA10
30
20
LA90
10
0
Time
Noise Logger Data 24 and 25 July 2011
80
70
60
50
LAE
40
LA10
30
LA90
20
10
0
Time
Page 20 of 22
Author: Brendon Sippel – Substation Design Southern
Version 1.0
Noise Assessment for
Proposed Dartmouth St Zone
Substation
9:29:12 AM
7:44:12 AM
5:59:12 AM
4:14:12 AM
2:29:12 AM
12:44:12 AM
10:59:12 PM
9:14:12 PM
7:29:12 PM
5:44:12 PM
3:59:12 PM
2:14:12 PM
12:29:12 PM
10:44:12 AM
8:59:12 AM
7:14:12 AM
5:29:12 AM
3:44:12 AM
1:59:12 AM
12:14:12 AM
Sound Pressure Level dB(A)
11:44:12 PM
9:14:12 PM
6:44:12 PM
4:14:12 PM
1:44:12 PM
11:14:12 AM
8:44:12 AM
6:14:12 AM
3:44:12 AM
1:14:12 AM
10:44:12 PM
8:14:12 PM
5:44:12 PM
3:14:12 PM
12:44:12 PM
10:14:12 AM
7:44:12 AM
5:14:12 AM
2:44:12 AM
12:14:12 AM
Sound Pressure Level dB(A)
DWG: 1021272-01
Noise Logger Data 26 and 27 July 2011
80
70
60
50
40
LAE
LA10
30
LA90
20
10
0
Time
Noise Logger Data 28 and 29 July 2011
80
70
60
50
LAE
40
LA10
30
LA90
20
10
0
Time
Page 21 of 22
Appendix B: Hervey Bay, Queensland Daily Weather Observations for 22nd of July to 29th of
July 2011.****
Date
22
23
24
25
26
27
28
29
****
Day
Fr
Sa
Su
Mo
Tu
We
Th
Fr
Temps
Min Max
Rain
°C
°C
mm
8.4
8.8
7.9
6.9
5.1
5.7
10
11
21.9
21.2
21.5
21.5
22.6
22.4
20.9
21.4
0
0
0
0
0
0
0
0
Evap
mm
Sun
Max wind gust
Dir
Spd Time
hours
SW
SSE
SSW
N
N
E
ESE
SSE
Temp
RH
km/h
local
°C
%
30
35
24
26
22
20
35
39
8:49
11:13
10:05
12:49
15:39
12:02
15:08
15:15
15.1
15.5
14.1
14.3
14.4
14.7
16
16.4
54
63
65
80
77
77
67
97
9:00 AM
Cld
Dir
th
8
SW
SSW
SSW
SSW
SSW
SSW
S
SSW
Spd
MSLP
Temp
RH
km/h
hPa
°C
%
19
19
13
7
6
7
17
15
1013
1015
1019
1022
1024
1025
1026
1025
21.3
19.6
20.5
20.3
21.1
21.3
19.6
20
45
51
37
50
40
47
40
100
Weather data from Australian Government – Bureau of Meteorology (http://www.bom.gov.au/climate/dwo/201107/html/IDCJDW4056.201107.shtml)
3:00 PM
Cld Dir
th
8
SE
SE
SE
NNE
N
NE
SE
SSE
Spd
MSLP
km/h
hPa
13
19
13
15
15
11
20
22
1010
1013
1016
1019
1021
1022
1023
1022