AS 2067/Amdt 1/2010-02-24
STANDARDS AUSTRALIA
Amendment No. 1
to
AS 2067—2008
Substations and high voltage installations exceeding 1 kV a.c.
CORRECTION
The 2008 edition of AS 2067 is amended as follows; the amendment(s) should be inserted in the appropriate
place(s).
SUMMARY: This Amendment applies to the Preface, Clauses 1.2, 1.3.4, 1.3.20, 1.3.30, 1.3.31, 1.3.44, 1.3.51,
1.3.62, 2.1.1, 2.2.4.1, 2.2.6, 3.1, 3.2, 3.3, 3.4, 4.1.1, 4.2.2, 4.2.3, 5.1.4, 5.2.7, 5.5.2.1, 6.7.3, 6.7.4, 6.7.8, 6.7.9,
6.7.13, 6.7.14, 7.3.2, Paragraph B2.1, Appendices C and E, Tables 3.1 and 3.2, 6.1, A1 and Figures 5.1, 5.2,
5.3, 6.7.
Published on 24 February 2010.
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Preface
In the fourth paragraph, replace ‘20007’ with ‘2007’.
Clause 1.2
In the title of IEC 61936, replace ‘1 V a.c’ with ‘1 kV a.c.’
Clause 1.3.4
Replace the heading ‘busbar’ with ‘Busbar’.
Clause 1.3.20
Add the word ‘and’ before ‘appliances’ at the end of the clause.
Clause 1.3.30
Replace the heading ‘High voltage’ with ‘High voltage (HV)’.
Clause 1.3.31
Replace the heading and clause with—
‘1.3.31 Highest voltage for installation (U m)
Highest r.m.s. value of phase-to-phase voltage for which the installation is designed in
respect of its insulation.’
Clause 1.3.44
Replace the heading ‘Low voltage’ with ‘Low voltage (LV)’.
Clause 1.3.51
Replace the heading ‘Nominal voltage of a system (U)’ with ‘Nominal voltage of a
system (U n )’.
Clause 1.3.62
In the first line, replace ‘in event of fault’ with ‘in the event of a fault’.
ISBN 978 0 7337 9412 4
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Clause 2.1.1
In the sixth paragraph, beginning ‘Unless the installation’ insert the word ‘solely’ after
‘operate’.
Clause 2.2.4.1
Delete the second NOTE and replace with—
‘2 Where a high voltage installation has on-site generation (co-generation), motors or parallel
operation with a transmission or distribution network, allowance shall be made for the
increased fault levels.’
Clause 2.2.6
Delete the last paragraph and replace with—
‘When the acceptable value is exceeded, the corona level may be controlled, for example,
by the installation of corona rings or the recessing of fasteners on fittings for high voltage
suspension insulator assemblies, busbar support assemblies, busbar connections and
equipment terminals.’
Clause 3.1
Delete the third paragraph and replace with—
‘For minimum phase-to-phase and phase-to-earth clearances required refer to Table 3.1 for
outdoor installations and Table 3.2 for indoor installations.’
Clause 3.2
1
Delete the first paragraph and replace with—
‘The insulation level shall be chosen according to the established highest voltage for
equipment U m and/or impulse withstand voltage.’
2
Delete the fourth paragraph and replace with the following:
‘In installations in which the configuration of the system, due to the adopted method
of neutral earthing or the protection by surge arresters, makes it appropriate to lower
the level of insulation, the lower alternative values of Table 3.1 and Table 3.2 may be
applied.’
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Clause 3.3
1
Delete the second paragraph and replace with—
‘If the minimum clearances in Table 3.1 and Table 3.2 are not maintained the ability
to withstand the test voltages of the chosen insulation level shall be established by
applying the appropriate dielectric tests in accordance with AS 1931.1 for the
withstand voltage values given in Table 3.1 and Table 3.2.’
2
Delete the third paragraph and replace with the following:
‘If the minimum clearances referenced in Table 3.1 and Table 3.2 are not maintained
in parts or areas of an installation, dielectric tests restricted to these parts or areas will
be required.’
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Clause 3.4
Delete the third paragraph and replace with—
‘The minimum clearances in air between phases or between conductors of the same phase
that are separable electrically from each other shall be at least 15% greater than the values
given in Column 6 of Table 3.1 (for voltages up to and including U m = 245 kV).’
Table 3.1
Delete Table 3.1 and replace with the following:
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TABLE 3.1
ROD TO STRUCTURE/PLATE GEOMETRY (VOLTAGE RANGE 1 AND VOLTAGE RANGE II)
1
2
Nominal
voltage
Highest
voltage
(see note 6)
(kV r.m.s)
Un
Up to 3.3
6.6
11
(kV r.m.s)
Um
Up to 3.6
7.2
12
22
24
33
36
66
110
72.5
123
132
145
220
245
275
300
330
362
500
550
3
Rated short
duration
power
frequency
withstand
voltage
(kV r.m.s)
10
20
28
28
50
50
70
70
140
185
230
230
275
360
395
460
380
450
450
520
620
680
NOTE: Refer to Notes following Table 3.2.
4
5
6
7
8
9
Rated
lightning
impulse
withstand
voltage
Rated
switching
impulse
withstand
voltage
Minimum
phase-toearth
clearance
Minimum
phase-tophase
clearance
Nonflashover
distance
Ground
safety
clearance
(kV peak)
(kV peak)
(mm)
(mm)
(mm)
N
65
100
130
175
240
310
350
420
695
990
1210
1210
1430
1800
2015
2225
2015
2545
2545
3075
3605
4345
(mm)
G
2440
40
60
75
(95)
125
(145)
170
(200)
325
450
550
550
650
850
950
1050
950
1050
1050
1175
1425
1550
750
850
850
950
1050
1175
60
90
120
(160)
220
(280)
320
(380)
630
900
1100
1100
1300
1700
1900
2100
1900
2400
2400
2900
3400
4100
70
105
140
185
255
325
370
440
725
1035
1265
1265
1495
1955
2185
2415
2185
2760
2760
3335
3910
4715
10
11
12
Safety clearances for operational
purposes and maintenance work
Vertical
Section
Horizontal
safety
work safety work safety
clearance
clearance
clearance
(N + G)
(N + 1900)
(N + 1340)
(mm)
(mm)
(mm)
S
H
V
2505
1965
1405
2540
2000
1440
2570
2030
1470
2615
2075
1515
2680
2140
1580
2750
2210
1650
2790
2250
1690
2860
2320
1760
3135
2595
2035
3430
2890
2330
3650
3110
2550
3650
3110
2550
3870
3330
2770
4240
3700
3140
4455
3915
3355
4665
4125
3565
4455
3915
3355
4985
4445
3885
4985
4445
3885
5515
4975
4415
6045
5505
4945
6785
6245
5685
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Table 3.2
Delete Table 3.2 and the following Notes and replace with the following:
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TABLE 3.2
CONDUCTOR TO STRUCTURE GEOMETRY, U m >245 kV (VOLTAGE RANGE II)
1
2
Nominal
voltage
Highest
voltage
(see note 6)
(kV r.m.s)
Un
275
(kV r.m.s)
Um
300
330
362
500
550
3
Rated short
duration
power
frequency
withstand
voltage
(kV r.m.s)
380
450
450
520
620
680
4
5
6
7
8
9
Rated
lightning
impulse
withstand
voltage
Rated
switching
impulse
withstand
voltage
Minimum
phase-toearth
clearance
Minimum
phase-tophase
clearance
Nonflashover
distance
Ground
safety
clearance
(kV peak)
(kV peak)
(mm)
(mm)
(mm)
N
1800
2015
2015
2330
2755
3285
(mm)
G
2440
950
1050
1050
1175
1425
1550
750
850
850
950
1050
1175
1700
1900
1900
2200
2600
3100
1955
2185
2185
2530
2990
3565
10
11
12
Safety clearances for operational
purposes and maintenance work
Vertical
Section
Horizontal
safety
work safety work safety
clearance
clearance
clearance
(N + G)
(N + 1900)
(N + 1340)
(mm)
(mm)
(mm)
S
H
V
4240
3700
3140
4455
3915
3355
4455
3915
3355
4770
4230
3670
5195
4655
4095
5725
5185
4625
NOTES TO TABLES 3.1 AND 3.2
1
The clearances in Table 3.1 and 3.2 are based on the climatic conditions described in Clause 2.4.
2
The phase-to-earth clearances given in Column 6 of Table 3.1 are for unfavourable configurations of live and earthed parts, i.e. the ‘rod-structure’ arrangement, and may be
used for determining clearances to earth from live parts of any configuration.
3
The phase-to-earth clearances given in Column 6 of Table 3.2 for U m >245 kV r.m.s. are for ‘conductor-structure’ configurations normally employed at the higher voltages.
(For background information on electrode configurations, refer to CIGRE Technical Brochure 72-1992, Guidelines for the evaluation of dielectric strength of external
insulation, and to AS 1824.2.)
4
The higher values shown in parentheses in Column 4 are included to cover those distribution installations that may be exposed to higher than normal overvoltages or where a
higher level of safety or withstand is required. For other installations the lower values are preferred.
5
The values shown in parentheses in Column 6 correspond to the rated lightning impulse withstand voltages shown in parentheses in Column 4.
6
For U m <36 kV r.m.s., it may be desirable to increase the phase-to-earth and phase-to-phase clearances where the presence of birds or vermin could cause a hazard or for
constructional or other reasons.
7
The non-flashover distances given in Column 8 include a margin of 10% up to an air clearance of 1300 mm in Column 6 and 6% for 1400 mm and above to allow for variations
in construction dimensions. This margin may be deleted when the conditions for carrying out the work are adequate to ensure that the minimum phase-to-earth air clearance is
observed in all cases.
8
If considered desirable, the section safety clearance given in Column 10 may be increased to 3000 mm as a minimum for air clearances up to 380 mm, in Column 6.
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Clause 4.1.1
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Clause 4.2.2
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Clause 4.2.3
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Clause 5.1.4
Delete Item (a) and replace with—
‘(a)
Safe physical arrangement when properly assembled, installed and connected to
supply.’
Delete the second paragraph and replace with—
‘The main selection criteria for transformers are given in Section 2 and Section 6.
Delete the heading and replace with—
‘4.2.3 Gas-insulated metal-enclosed equipment (GIE), metal-enclosed switchgear,
insulation-enclosed switchgear and other prefabricated type-tested switchgear and
fusegear assemblies’
Delete the entire clause and replace with—
‘Transport routes, their load capacity, height and width shall be adequate for movements of
anticipated transport units and shall be agreed upon between the supplier and the user.
Within high voltage installations, the passage of vehicles or other mobile equipment
beneath or in proximity to live parts (without protective measures) is permitted in
accordance with regulatory requirements where they exist. Where no regulatory
requirements exist the following conditions shall be met whilst vehicles are in transit (see
Figures 5.1, 5.2 and 5.3 and refer to Clause 3.3 and Tables 3.1 and 3.2 for safety
clearances):
(a)
Where vehicles which personnel do not sit or stand upon or within, whilst the vehicle
is in transit are used for transporting equipment clearance T = N + 100 (minimum
500 mm) shall apply between the vehicle, and its load and any live part.
Section safety clearance (S) shall be provided between the operator’s walkway and
any live part at all times. (Refer to Figure 5.1)
(b)
Where personnel must remain within the cab of the vehicle whilst it is in transit
clearance T = N + 100 (minimum 500 mm) shall apply between the vehicle, with open
doors, and its load, to live parts, at all times. (Refer Figure 5.2).
Personnel may remain in vehicles or mobile equipment only if there are adequate
protective measures on the vehicle or mobile equipment, for example the cab roof, to
ensure that the danger zone defined above cannot be infringed.
(c)
Where mobile equipment can be moved whilst being stood or sat upon, the greater of
the following clearances shall be applied (Refer Figure 5.3):
(i)
Section safety clearance (S) is applied from any part of the vehicle or mobile
plant where a person would normally sit or stand to live parts.
(ii)
Clearance X = N + 1900 is applied horizontally from the extremities of the
vehicle when against the kerb line or side of the access way to live parts and
exposed conductors.
Procedures will be required to ensure safe passage of vehicles and mobile plant.
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Figure 5.1
Delete the caption and replace with—
FIGURE 5.1 MINIMUM APPROACH DISTANCE FOR TRANSPORT IN TRANSIT—
TYPICAL INDOOR INSTALLATION WHERE THE VEHICLES CANNOT BE STOOD OR SAT
UPON OR SAT WITHIN WHILST IN TRANSIT
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Figure 5.2
Delete the caption and replace with—
FIGURE 5.2 MINIMUM APPROACH DISTANCE FOR TRANSPORT IN TRANSIT—
TYPICAL OUTDOOR INSTALLATION WHERE PERSONNEL MUST REMAIN WITHIN THE
CAB WHILST IN TRANSIT
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Figure 5.3
Delete the figure and caption and replace with—
X
S
X
S
X
N
N FIGURE 5.3 MINIMUM APPROACH DISTANCE FOR TRANSPORT IN TRANSIT—
TYPICAL OUTDOOR INSTALLATION WHERE THE VEHICLES CAN BE STOOD OR SAT
UPON WHILST IN TRANSIT
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Clause 5.2.7
Delete the second paragraph and replace with—
‘Where bare conductors approach buildings that are located within closed electrical
operating areas, the following clearances shall be maintained, after allowing for the
maximum sag/swing in the case of stranded conductors:’
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Clause 5.5.2.1
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Table 6.1
Delete the last paragraph and replace with—
‘Pipelines and other equipment, if allowed in substations, shall be designed so that the
electrical installation is not affected, even in the event of damage to the pipe or other
equipment.’
Delete the column headings and replace with—
Transformer type
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Clause 6.7.3
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Clause 6.7.4
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Clause 6.7.8
Liquid volume
Clearance G 1 to other
transformers or fire
resistant surfaces
Clearance G 2 to
combustible building
surface
Delete Item (c) and replace with—
‘(c)
Other plant and equipment such as cables, batteries, drainage pipes may catch fire and
spread the fire.’
Delete the second sentence of the fifth paragraph and replace with—
‘Transformers insulated with either non-combustible or combustible liquids should have a
blast wall between them for additional protection if the separation distance specified in
Clause 6.7.2 is not met or determined in accordance with Clause 6.7.13.’
Delete the text and replace with—
‘Distribution kiosk/padmount cubicles and walled high voltage installations (those with no
roof and with a single leaf masonry wall) and rating not exceeding 1000 kVA may be
installed not closer than 3 m from a Building Codes of Australia Class 1 or Class 10
building in low density residential areas, without extra protective measures, as shown in
Appendix C, Figure C1.
NOTE: This reduced distance of 3 m will be reviewed for the next edition of this Standard.’
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Clause 6.7.9
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Clause 6.7.13
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Clause 6.7.14
1
In the fifth paragraph, replace ‘--/120/30’ with ‘--/120/120’.
2
In the eighth paragraph, replace ‘self-enclosing dampers’ with ‘self-closing dampers’.
Delete the last sentence beginning ‘See also’.
Delete the first paragraph (but not the list) and replace with—
‘Typical high voltage installation arrangements to satisfy the minimum fire protection
requirements of this Standard, the Building Code of Australia and AS 1940 are provided in
Appendix C. The examples in Appendix C are for distribution substations having
transformers with less than 1000 L of oil per transformer. The following is to be noted:’
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Figure 6.7
Delete the figure and replace with—
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Clause 7.3.2
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Appendix A
Delete the text and replace with—
‘For supplies belonging to the essential group, such as the supplies to a computerized
control system, liable to process incorrect signals after a transient loss of power, the
provision of a suitable UPS (uninterruptible power supply) or automatic changeover to a
fully rated back-up supply is recommended.’
1
Delete Table A1 and replace with the following:
TABLE A1
TYPICAL TOUCH VOLTAGE LIMITS
Time (msec)
10
20
50
100
150
200
300
400
500
700
1000
2000
5000
10000
Touch voltages
C1
C2
355
351
339
319
297
270
205
137
93
67
56
49
45
43
808
790
742
676
619
563
436
306
214
136
109
94
85
82
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2
Delete the text after Table A1 and replace with—
‘The values for the two curves C1 and C2 used in Figure A2 are shown in Table A1.
Formulae by which the specified voltage limits may be calculated are as follows:
C1 Special locations—High public contact likelihood with negligible additional
series impedance
Vt =
a + ct + et 2 + gt 3 + it 4 + kt 5
1+ bt + dt 2 + ft 3 + ht 4 + jt 5
where
t
=
clearing time in milliseconds
a
=
358.8444
b
=
−3.8399e-03
c
=
−1.7939
d
=
3.7036e-06
e
=
3.4832e-03
f
=
1.4786e-08
g
=
−2.6211e-06
h
=
−4.8406e-11
i
=
−4.4354e-10
j
=
5.2568e-14
k
=
2.1260e-12
C2 Normal locations—Normal public contact likelihood with typical mix of
additional series impedance
Vt =
a + ct + et 2 + gt 3 + it 4
1+ bt + dt 2 + ft 3 + ht 4
where
t
=
clearing time in milliseconds
a
=
828.10
b
=
8.0916e-04
c
=
−1.3631
d
=
−6.2782e-06
e
=
6.2308e-04
f
=
1.5372e-08
g
=
1.5046e-06
h
=
1.3723e-11
i
=
1.0909e-09’
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Paragraph B2.1
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Appendix C
Delete Item (b) and replace with—
‘(b) has combined HV and LV (common) earthing; and’
Delete the entire Appendix and replace with the following:
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APPENDIX C
FIRE RISK ZONES FOR DISTRIBUTION SUBSTATIONS
(Informative)
For all figures below, the fire protection requirements of the Building Code of Australia
apply together with (if combustible liquid-containing electrical equipment is employed) the
Appendix H requirements of AS 1940—2004. The examples are for distribution substations
having transformers with less than 1000 l of oil per transformer.
FIGURE C1 NON-FIRE-RATED KIOSK-TYPE SUBSTATION IN A LOW DENSITY
RESIDENTIAL AREA
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FIGURE C2 NON-FIRE-RATED SUBSTATION IN AN AREA INCORPORATING HV
EQUIPMENT WITH COMBUSTIBLE LIQUID DIELECTRIC
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FIGURE C3 NON-FIRE-RATED SUBSTATION IN AN AREA INCORPORATING DRYTYPE HV EQUIPMENT (SWITCHGEAR AND/OR TRANSFORMERS) OR HV EQUIPMENT
WITH NON-COMBUSTIBLE DIELECTRIC
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FIGURE C4 ADJACENT NON-FIRE-RATED SUBSTATION IN AN AREA
INCORPORATING HV EQUIPMENT WITH COMBUSTIBLE DIELECTRIC
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FIGURE C5 ATTACHED OR ADJACENT SUBSTATION WITH FIRE-RATED WALLS AND
ROOF AND NON-FIRE-RATED DOORS AND VENTS
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FIGURE C6 INDOOR SUBSTATION WITH PUBLIC ACCESS ABOVE
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FIGURE C7 OPEN TOP SUBSTATION WITH FIRE-RATED WALLS AND NON-FIRERATED DOORS
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FIGURE C8 NON-FIRE-RATED SUBSTATION IN A COMMERCIAL/INDUSTRIAL AREA
INCORPORATING HV EQUIPMENT WITH COMBUSTIBLE LIQUID DIELECTRIC AND
FIRE-RATED BLAST WALL
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Appendix E
Delete the entire Appendix.
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