AS/NZS 60137:2020
Insulated bushings for alternating voltages above 1 000 V
Standard adopts IEC 60137:2017 with modifications for Australia and New Zealand, which specifies the characteristics and tests for insulated bushings. This Standard is applicable to bushings, as defined in Clause 3, intended for use in electrical apparatus, machinery, transformers, switchgear and installations for three-phase alternating current systems, having highest voltage for equipment above 1 000 V and power frequencies of 15 Hz up to and including 60 Hz. Subject to special agreement between purchaser and supplier, this standard may be applied, in part or as a whole to the following: (a) Bushings used in other than three-phase systems. (b) Bushings for high-voltage direct current systems. (c) Bushings for testing transformers. (d) Bushings for capacitors. Special requirements and tests for transformer bushings in this Standard apply also to reactor bushings. This Standard is applicable to bushings made and sold separately. Bushings which are a part of an apparatus and which cannot be tested according to this Standard should be tested with the apparatus of which they form part. This standard is an adoption with national modifications, and has been reproduced from, IEC 60137:2017 Insulated bushings for alternating voltages above 1000 V.
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AS/NZS 60137:2020 Insulated bushings for alternating voltages above 1000 V (IEC 60137:2017 (ED.7.0) MOD)
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Ratings
4.1 Rated highest voltage for equipment (Um)
4.2 Rated current (Ir)
4.3 Rated thermal short-time current (Ith)
4.4 Rated dynamic current (Id)
4.5 Minimum withstand values of cantilever load
4.6 Angle of mounting
4.7 Minimum nominal creepage distance
4.8 Temperature limits and temperature rise
4.9 Insulation levels
4.10 Test tap on transformer bushings
5 Operating conditions
5.1 Temporary overvoltages
5.2 Altitude
5.3 Temperature of ambient air and immersion media
5.4 Seismic conditions
5.5 Very fast transients (VFT)
5.6 Transformer insulating liquid
6 Ordering information and markings
6.1 Enumeration of characteristics
6.1.1 General
6.1.2 Application
6.1.3 Classification of bushings
6.1.4 Ratings
6.1.5 Operating conditions
6.1.6 Design
6.2 Markings
7 Test requirements
7.1 General requirements
7.2 Test classification
7.2.1 General
7.2.2 Type tests
7.2.3 Routine tests
7.2.4 Special tests
7.3 Condition of bushings during dielectric and thermal tests
8 Type tests
8.1 General
8.2 Dry or wet power-frequency voltage withstand test
8.2.1 Applicability
8.2.2 Test method and requirements
8.2.3 Acceptance
8.3 Long duration power-frequency voltage withstand test (ACLD)
8.3.1 Applicability
8.3.2 Test method and requirements
8.3.3 Acceptance
8.4 Dry lightning impulse voltage withstand test
8.4.1 Applicability
8.4.2 Test method and requirements
8.4.3 Acceptance
8.5 Dry or wet switching impulse voltage withstand test
8.5.1 Applicability
8.5.2 Test method and requirements
8.5.3 Acceptance
8.6 Thermal stability test
8.6.1 Applicability
8.6.2 Test method and requirements
8.6.3 Acceptance
8.7 Electromagnetic compatibility tests (EMC)
8.7.1 Emission test
8.7.2 Immunity test
8.8 Temperature rise test
8.8.1 Applicability
8.8.2 Test method and requirements
8.8.3 Acceptance
8.9 Verification of thermal short-time current withstand
8.9.1 Applicability
8.9.2 Verification method and requirements
8.9.3 Acceptance
8.10 Cantilever load withstand test
8.10.1 Applicability
8.10.2 Test method and requirements
8.10.3 Acceptance
8.11 Tightness test on liquid-filled, compound-filled and liquid-insulated bushings
8.11.1 Applicability
8.11.2 Test method and requirements
8.11.3 Acceptance
8.12 Internal pressure test on gas-filled, gas-insulated and gas-impregnated bushings
8.12.1 Applicability
8.12.2 Test method and requirements
8.12.3 Acceptance
8.13 External pressure test on partly or completely gas-immersed bushings
8.13.1 Applicability
8.13.2 Test method and requirements
8.13.3 Acceptance
8.14 Verification of dimensions
8.14.1 Applicability
8.14.2 Acceptance
9 Routine tests
9.1 General
9.2 Measurement of dielectric dissipation factor (tan δ ) and capacitance at ambient temperature
9.2.1 Applicability
9.2.2 Test method and requirements
9.2.3 Acceptance
9.3 Dry lightning impulse voltage withstand test
9.3.1 Applicability
9.3.2 Test method and requirements
9.3.3 Acceptance
9.4 Dry power-frequency voltage withstand test
9.4.1 Applicability
9.4.2 Test method and requirements
9.4.3 Acceptance
9.5 Measurement of partial discharge quantity
9.5.1 Applicability
9.5.2 Test method and requirements
9.5.3 Acceptance
9.6 Tests of tap insulation
9.6.1 Applicability and test requirements
9.6.2 Acceptance
9.7 Internal pressure test on gas-filled, gas-insulated and gas-impregnated bushings
9.7.1 Applicability
9.7.2 Test method and requirements
9.7.3 Acceptance
9.8 Tightness test on liquid-filled, compound-filled and liquid-insulated bushings
9.8.1 Applicability
9.8.2 Test method and requirements
9.8.3 Acceptance
9.9 Tightness test on gas-filled, gas-insulated and gas-impregnated bushings
9.9.1 Applicability
9.9.2 Test method and requirements
9.9.3 Acceptance
9.10 Tightness test at the flange or other fixing device
9.10.1 Applicability
9.10.2 Test method and requirements
9.10.3 Acceptance
9.11 Visual inspection and dimensional check
9.11.1 Applicability
9.11.2 Acceptance
10 Requirements and tests for non-capacitance graded bushings of rated highest voltages for equipment up to and including 52 kV
10.1 General
10.2 Temperature requirements
10.3 Level of immersion medium
10.4 Markings
10.5 Test requirements
10.5.1 General
10.5.2 Type tests
10.5.3 Routine tests
11 Recommendations for transport, storage, erection, operation and maintenance
11.1 General
11.2 Conditions during transport, storage and installation
11.3 Installation
11.4 Unpacking and lifting
11.5 Assembly
11.5.1 General
11.5.2 Mounting
11.5.3 Connections
11.5.4 Final installation inspection
11.6 Operation
11.7 Maintenance
11.7.1 General
11.7.2 Recommendation for the manufacturer
11.7.3 Recommendations for the user
11.7.4 Failure report
12 Safety
12.1 General
12.2 Electrical aspects
12.3 Mechanical aspects
12.4 Thermal aspects
13 Environmental aspects
Annex A (informative) Determination of the hottest spot in bushings with conductors embedded in the insulation material
Bibliography
Figures
Figure 1 – Factor m on the co-ordination switching impulse withstand voltage
Figure 2 – Marking plate for bushings for rated highest voltage for equipment (Um) greater than 100 kV
Figure 3 – Marking plate for bushings for rated highest voltage for equipment (Um) equal to or less than 100 kV, except for bushings for which Figure 4 is applicable
Figure 4 – Marking plate for bushings for rated highest voltage for equipment (Um) equal to or less than 52 kV made of ceramic, glass or inorganic materials, resin or combined insulation (see 10.3)
Figure 5 – Voltage profile for long duration test
Tables
Table 1 – Minimum values of cantilever withstand load (see 4.5 and 8.10)
Table 2 – Maximum values of temperature and temperature rise above ambient air (see 4.8)
Table 3 – Insulation levels for highest voltage for equipment (Um) (see 4.9, 8.2, 8.4, 8.5, 9.3 and 9.4)
Table 4 – Temperature of ambient air and immersion media
Table 5 – Applicability of type tests (see 7.2.2, excluding bushings according to Clause 10)
Table 6 – Applicability of routine tests (see 7.2.3, excluding bushings according to Clause 10)
Table 7 – Correction of test voltages (see 7.3)
Table 8 – Maximum values of tan δ and tan δ increase (see 9.2)
Table 9 – Maximum values of partial discharge quantity (see 8.3 and 9.5)
Table 10 – Applicability of type tests for bushings according to Clause 10 (see 10.5.1)
Table 11 – Applicability of routine tests for bushings according to Clause 10 (see 10.5.3)
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AS/NZS 60137:2020 Insulated bushings for alternating voltages above 1000 V (IEC 60137:2017 (ED.7.0) MOD)
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Ratings
4.1 Rated highest voltage for equipment (Um)
4.2 Rated current (Ir)
4.3 Rated thermal short-time current (Ith)
4.4 Rated dynamic current (Id)
4.5 Minimum withstand values of cantilever load
4.6 Angle of mounting
4.7 Minimum nominal creepage distance
4.8 Temperature limits and temperature rise
4.9 Insulation levels
4.10 Test tap on transformer bushings
5 Operating conditions
5.1 Temporary overvoltages
5.2 Altitude
5.3 Temperature of ambient air and immersion media
5.4 Seismic conditions
5.5 Very fast transients (VFT)
5.6 Transformer insulating liquid
6 Ordering information and markings
6.1 Enumeration of characteristics
6.1.1 General
6.1.2 Application
6.1.3 Classification of bushings
6.1.4 Ratings
6.1.5 Operating conditions
6.1.6 Design
6.2 Markings
7 Test requirements
7.1 General requirements
7.2 Test classification
7.2.1 General
7.2.2 Type tests
7.2.3 Routine tests
7.2.4 Special tests
7.3 Condition of bushings during dielectric and thermal tests
8 Type tests
8.1 General
8.2 Dry or wet power-frequency voltage withstand test
8.2.1 Applicability
8.2.2 Test method and requirements
8.2.3 Acceptance
8.3 Long duration power-frequency voltage withstand test (ACLD)
8.3.1 Applicability
8.3.2 Test method and requirements
8.3.3 Acceptance
8.4 Dry lightning impulse voltage withstand test
8.4.1 Applicability
8.4.2 Test method and requirements
8.4.3 Acceptance
8.5 Dry or wet switching impulse voltage withstand test
8.5.1 Applicability
8.5.2 Test method and requirements
8.5.3 Acceptance
8.6 Thermal stability test
8.6.1 Applicability
8.6.2 Test method and requirements
8.6.3 Acceptance
8.7 Electromagnetic compatibility tests (EMC)
8.7.1 Emission test
8.7.2 Immunity test
8.8 Temperature rise test
8.8.1 Applicability
8.8.2 Test method and requirements
8.8.3 Acceptance
8.9 Verification of thermal short-time current withstand
8.9.1 Applicability
8.9.2 Verification method and requirements
8.9.3 Acceptance
8.10 Cantilever load withstand test
8.10.1 Applicability
8.10.2 Test method and requirements
8.10.3 Acceptance
8.11 Tightness test on liquid-filled, compound-filled and liquid-insulated bushings
8.11.1 Applicability
8.11.2 Test method and requirements
8.11.3 Acceptance
8.12 Internal pressure test on gas-filled, gas-insulated and gas-impregnated bushings
8.12.1 Applicability
8.12.2 Test method and requirements
8.12.3 Acceptance
8.13 External pressure test on partly or completely gas-immersed bushings
8.13.1 Applicability
8.13.2 Test method and requirements
8.13.3 Acceptance
8.14 Verification of dimensions
8.14.1 Applicability
8.14.2 Acceptance
9 Routine tests
9.1 General
9.2 Measurement of dielectric dissipation factor (tan δ ) and capacitance at ambient temperature
9.2.1 Applicability
9.2.2 Test method and requirements
9.2.3 Acceptance
9.3 Dry lightning impulse voltage withstand test
9.3.1 Applicability
9.3.2 Test method and requirements
9.3.3 Acceptance
9.4 Dry power-frequency voltage withstand test
9.4.1 Applicability
9.4.2 Test method and requirements
9.4.3 Acceptance
9.5 Measurement of partial discharge quantity
9.5.1 Applicability
9.5.2 Test method and requirements
9.5.3 Acceptance
9.6 Tests of tap insulation
9.6.1 Applicability and test requirements
9.6.2 Acceptance
9.7 Internal pressure test on gas-filled, gas-insulated and gas-impregnated bushings
9.7.1 Applicability
9.7.2 Test method and requirements
9.7.3 Acceptance
9.8 Tightness test on liquid-filled, compound-filled and liquid-insulated bushings
9.8.1 Applicability
9.8.2 Test method and requirements
9.8.3 Acceptance
9.9 Tightness test on gas-filled, gas-insulated and gas-impregnated bushings
9.9.1 Applicability
9.9.2 Test method and requirements
9.9.3 Acceptance
9.10 Tightness test at the flange or other fixing device
9.10.1 Applicability
9.10.2 Test method and requirements
9.10.3 Acceptance
9.11 Visual inspection and dimensional check
9.11.1 Applicability
9.11.2 Acceptance
10 Requirements and tests for non-capacitance graded bushings of rated highest voltages for equipment up to and including 52 kV
10.1 General
10.2 Temperature requirements
10.3 Level of immersion medium
10.4 Markings
10.5 Test requirements
10.5.1 General
10.5.2 Type tests
10.5.3 Routine tests
11 Recommendations for transport, storage, erection, operation and maintenance
11.1 General
11.2 Conditions during transport, storage and installation
11.3 Installation
11.4 Unpacking and lifting
11.5 Assembly
11.5.1 General
11.5.2 Mounting
11.5.3 Connections
11.5.4 Final installation inspection
11.6 Operation
11.7 Maintenance
11.7.1 General
11.7.2 Recommendation for the manufacturer
11.7.3 Recommendations for the user
11.7.4 Failure report
12 Safety
12.1 General
12.2 Electrical aspects
12.3 Mechanical aspects
12.4 Thermal aspects
13 Environmental aspects
Annex A (informative) Determination of the hottest spot in bushings with conductors embedded in the insulation material
Bibliography
Figures
Figure 1 – Factor m on the co-ordination switching impulse withstand voltage
Figure 2 – Marking plate for bushings for rated highest voltage for equipment (Um) greater than 100 kV
Figure 3 – Marking plate for bushings for rated highest voltage for equipment (Um) equal to or less than 100 kV, except for bushings for which Figure 4 is applicable
Figure 4 – Marking plate for bushings for rated highest voltage for equipment (Um) equal to or less than 52 kV made of ceramic, glass or inorganic materials, resin or combined insulation (see 10.3)
Figure 5 – Voltage profile for long duration test
Tables
Table 1 – Minimum values of cantilever withstand load (see 4.5 and 8.10)
Table 2 – Maximum values of temperature and temperature rise above ambient air (see 4.8)
Table 3 – Insulation levels for highest voltage for equipment (Um) (see 4.9, 8.2, 8.4, 8.5, 9.3 and 9.4)
Table 4 – Temperature of ambient air and immersion media
Table 5 – Applicability of type tests (see 7.2.2, excluding bushings according to Clause 10)
Table 6 – Applicability of routine tests (see 7.2.3, excluding bushings according to Clause 10)
Table 7 – Correction of test voltages (see 7.3)
Table 8 – Maximum values of tan δ and tan δ increase (see 9.2)
Table 9 – Maximum values of partial discharge quantity (see 8.3 and 9.5)
Table 10 – Applicability of type tests for bushings according to Clause 10 (see 10.5.1)
Table 11 – Applicability of routine tests for bushings according to Clause 10 (see 10.5.3)
Previous versions
AS/NZS 60137:2020
Online Library subscription pricing
The cost of your subscription will depend on which standards you want to access, and how many people in your organisation need to be able to access the Online Library subscription at the same time (concurrent users). During your subscription period, we are also able to make any necessary changes and ensure you are aware of any pricing changes that result. For a quote, contact our Online Library team by emailing onlinelibrary@standards.govt.nz.