DL/T 404-2007 Alternating-current metal-enclosed switchgear and controlgear for rated voltages above 3.6kV and up to and including 40.5kV (English Version)
1.1 Scope
This standard specifies technical requirements for factory-assembled alternating-current metal-enclosed switchgear and controlgear of rated voltage above 3.6kV and up to and including 40.5kV and of frequency 50Hz for indoor or outdoor installation. The enclosures may include fixed or removable components and may be filled with fluid (liquid or gas) to provide insulation.
Note 1: Although primarily dedicated to three-phase systems, this standard can also be applied to single-phase or two-phase systems.
This standard defines several types of metal-enclosed switchgear and controlgear which differ due to
——the consequences on network service continuity in case of maintenance on the switchgear and controlgear;
——the need and convenience of maintenance of the equipment.
Note 2: Safety of the equipment results from the design, application, adjustment and coordination of products, installations and operations.
For metal-enclosed switchgear and controlgear containing gas-filled compartments, the design pressure is limited to a maximum of 0.3MPa (relative pressure).
Note 3: Gas-filled compartments having a design pressure exceeding 0.3MPa (relative pressure) should be designed and tested in accordance with GB 7674.
Metal-enclosed switchgear and controlgear for special use, for example, in flammable atmospheres, in mines or on board ships, may be subject to additional technical requirements.
Components contained in metal-enclosed switchgear and controlgear are to be designed and tested in accordance with their various relevant standards. This standard supplements the standards for the individual components regarding their installation in switchgear and controlgear assemblies.
This standard does not preclude that other equipment may be included in the same enclosure. In such a case, any possible influence of that equipment on the switchgear and controlgear is to be taken into account.
Note 4: Switchgear and controlgear having an insulation enclosure are covered by IEC 60466.
Note 5: Metal-enclosed switchgear and controlgear for rated voltage above 40.5kV insulated by ambient air may be covered by this standard taking into account the insulation levels of DL/T 593.
Foreword I
1 General
1.1 Scope
1.2 Normative References
2 Normal and Special Service Conditions
3 Terms and Definitions
4 Ratings
4.1 Rated Voltage (Ur)
4.2 Rated Insulation Level
4.3 Rated Frequency (fr)
4.4 Rated Current and Temperature Rise
4.5 Rated Short-time Withstand Current (Ik)
4.6 Rated Peak Withstand Current (Ip)
4.7 Rated Duration of Short Circuit (tk)
4.8 Rated Supply Voltage of Closing and Opening Devices and of Auxiliary and Control Circuits (Ua)
4.9 Rated Supply Frequency of Closing and Opening Devices and of Auxiliary Circuits
4.10 Rated Pressure of Compressed Gas Supply of Controlled Pressure System
4.11 Rated Filling Level of Gas or Liquid for Insulation and/or Operation
5 Design and Construction
5.1 Requirements for Liquids in Switchgear and Controlgear
5.2 Requirements for Gases in Switchgear and Controlgear
5.3 Earthing
5.4 Auxiliary and Control Equipment
5.5 Power Operation
5.6 Stored Energy Operation
5.7 Independent Manual Operation
5.8 Operation of Releases
5.9 Low- and High-pressure Interlocking and Monitoring Device
5.10 Nameplates
5.11 Interlocking Devices
5.12 Position Indication
5.13 Degrees of Protection by Enclosure
5.14 Creepage Distances
5.15 Gas and Vacuum Tightness
5.16 Liquid Tightness
5.17 Flammability
5.18 Electromagnetic Compatibility (EMC)
5.19 X-ray Radiation
5.20 Corrosion
5.101 Internal Fault
5.102 Enclosure
5.103 Compartments
5.104 Removable Parts
5.105 Provisions for Dielectric Tests on Cables
5.106 Requirements for the Minimum Air Gap
6 Type Tests
6.1 General
6.2 Dielectric Tests
6.3 Radio Interference Voltage (r.i.v) Test
6.4 Measurement of the Resistance of Circuits
6.5 Temperature-rise Tests
6.6 Short-time Withstand Current and Peak Withstand Current Tests
6.7 Verification of the Protection
6.8 Tightness Tests
6.9 Electromagnetic Compatibility Tests (EMC)
6.10 Additional Tests on Auxiliary and Control Circuits
6.11 X-ray Test Procedure of Vacuum Cut-off Device
6.101 Verification of Making and Breaking Capacities
6.102 Mechanical Operation Tests
6.103 Pressure Withstand Test and Gaseous State Detection for Gas-filled Compartment
6.104 Tests on Non-metallic Partitions and Shutters
6.105 Weatherproofing Test
6.106 Internal Arcing Test
7 Routine Tests
7.1 Dielectric Test on the Main Circuit
7.2 Tests on Auxiliary and Control Circuits
7.3 Measurement of the Resistance of the Main Circuit
7.4 Tightness Test
7.5 Design and Visual Checks
7.6 Tests on Mechanical Operation and Mechanical Characteristic
7.101 Partial Discharge Measurement
7.102 Pressure Tests of Gas-filled Compartments and Measurement of Gaseous State
7.103 Tests of Auxiliary Electrical, Pneumatic and Hydraulic Devices
7.104 Tests after Erection on Site
7.105 Measurement of Fluid Conditions after Filling on Site
8 Guide to the Selection of Metal-enclosed Switchgear and Controlgear for Service
8.1 Selection of Rated Values
8.2 Selection of Design and Construction
8.3 Internal Arc Classification
9 Information to be Given with Enquiries, Tenders and Orders
9.101 Information with Enquiries and Orders
9.102 Information with Tenders
10 Rules for Transport, Storage, Installation, Operation and Maintenance
10.1 Conditions during Transport, Storage and Installation
10.2 Installation
10.3 Operation
10.4 Maintenance
11 Safety
11.101 Procedure
11.102 Internal Arc Aspect
Annex A (Normative) Method for Testing the Metal-enclosed Switchgear and Controlgear under Conditions of Arcing due to an Internal Fault
Annex B (Normative) Partial Discharge Measurements
Annex C (Normative) Additional Requirements for Alternating-current Metal-enclosed Switchgear and Controlgear from 3.6kV to 40.5kV to Be Used in Severe Climatic Conditions
Annex D (Normative) Calculation Method of Cross Sectional Area of Bare Conductor in Accordance with Thermal Effect of Short-time Persistent Current
Annex E (Informative) Explanatory Notes
Bibliography
DL/T 404-2007 Alternating-current metal-enclosed switchgear and controlgear for rated voltages above 3.6kV and up to and including 40.5kV (English Version)
Standard No.
DL/T 404-2007
Status
superseded
Language
English
File Format
PDF
Word Count
34000 words
Price(USD)
680.0
Implemented on
2008-6-1
Delivery
via email in 1 business day
Detail of DL/T 404-2007
Standard No.
DL/T 404-2007
English Name
Alternating-current metal-enclosed switchgear and controlgear for rated voltages above 3.6kV and up to and including 40.5kV
1.1 Scope
This standard specifies technical requirements for factory-assembled alternating-current metal-enclosed switchgear and controlgear of rated voltage above 3.6kV and up to and including 40.5kV and of frequency 50Hz for indoor or outdoor installation. The enclosures may include fixed or removable components and may be filled with fluid (liquid or gas) to provide insulation.
Note 1: Although primarily dedicated to three-phase systems, this standard can also be applied to single-phase or two-phase systems.
This standard defines several types of metal-enclosed switchgear and controlgear which differ due to
——the consequences on network service continuity in case of maintenance on the switchgear and controlgear;
——the need and convenience of maintenance of the equipment.
Note 2: Safety of the equipment results from the design, application, adjustment and coordination of products, installations and operations.
For metal-enclosed switchgear and controlgear containing gas-filled compartments, the design pressure is limited to a maximum of 0.3MPa (relative pressure).
Note 3: Gas-filled compartments having a design pressure exceeding 0.3MPa (relative pressure) should be designed and tested in accordance with GB 7674.
Metal-enclosed switchgear and controlgear for special use, for example, in flammable atmospheres, in mines or on board ships, may be subject to additional technical requirements.
Components contained in metal-enclosed switchgear and controlgear are to be designed and tested in accordance with their various relevant standards. This standard supplements the standards for the individual components regarding their installation in switchgear and controlgear assemblies.
This standard does not preclude that other equipment may be included in the same enclosure. In such a case, any possible influence of that equipment on the switchgear and controlgear is to be taken into account.
Note 4: Switchgear and controlgear having an insulation enclosure are covered by IEC 60466.
Note 5: Metal-enclosed switchgear and controlgear for rated voltage above 40.5kV insulated by ambient air may be covered by this standard taking into account the insulation levels of DL/T 593.
Contents of DL/T 404-2007
Foreword I
1 General
1.1 Scope
1.2 Normative References
2 Normal and Special Service Conditions
3 Terms and Definitions
4 Ratings
4.1 Rated Voltage (Ur)
4.2 Rated Insulation Level
4.3 Rated Frequency (fr)
4.4 Rated Current and Temperature Rise
4.5 Rated Short-time Withstand Current (Ik)
4.6 Rated Peak Withstand Current (Ip)
4.7 Rated Duration of Short Circuit (tk)
4.8 Rated Supply Voltage of Closing and Opening Devices and of Auxiliary and Control Circuits (Ua)
4.9 Rated Supply Frequency of Closing and Opening Devices and of Auxiliary Circuits
4.10 Rated Pressure of Compressed Gas Supply of Controlled Pressure System
4.11 Rated Filling Level of Gas or Liquid for Insulation and/or Operation
5 Design and Construction
5.1 Requirements for Liquids in Switchgear and Controlgear
5.2 Requirements for Gases in Switchgear and Controlgear
5.3 Earthing
5.4 Auxiliary and Control Equipment
5.5 Power Operation
5.6 Stored Energy Operation
5.7 Independent Manual Operation
5.8 Operation of Releases
5.9 Low- and High-pressure Interlocking and Monitoring Device
5.10 Nameplates
5.11 Interlocking Devices
5.12 Position Indication
5.13 Degrees of Protection by Enclosure
5.14 Creepage Distances
5.15 Gas and Vacuum Tightness
5.16 Liquid Tightness
5.17 Flammability
5.18 Electromagnetic Compatibility (EMC)
5.19 X-ray Radiation
5.20 Corrosion
5.101 Internal Fault
5.102 Enclosure
5.103 Compartments
5.104 Removable Parts
5.105 Provisions for Dielectric Tests on Cables
5.106 Requirements for the Minimum Air Gap
6 Type Tests
6.1 General
6.2 Dielectric Tests
6.3 Radio Interference Voltage (r.i.v) Test
6.4 Measurement of the Resistance of Circuits
6.5 Temperature-rise Tests
6.6 Short-time Withstand Current and Peak Withstand Current Tests
6.7 Verification of the Protection
6.8 Tightness Tests
6.9 Electromagnetic Compatibility Tests (EMC)
6.10 Additional Tests on Auxiliary and Control Circuits
6.11 X-ray Test Procedure of Vacuum Cut-off Device
6.101 Verification of Making and Breaking Capacities
6.102 Mechanical Operation Tests
6.103 Pressure Withstand Test and Gaseous State Detection for Gas-filled Compartment
6.104 Tests on Non-metallic Partitions and Shutters
6.105 Weatherproofing Test
6.106 Internal Arcing Test
7 Routine Tests
7.1 Dielectric Test on the Main Circuit
7.2 Tests on Auxiliary and Control Circuits
7.3 Measurement of the Resistance of the Main Circuit
7.4 Tightness Test
7.5 Design and Visual Checks
7.6 Tests on Mechanical Operation and Mechanical Characteristic
7.101 Partial Discharge Measurement
7.102 Pressure Tests of Gas-filled Compartments and Measurement of Gaseous State
7.103 Tests of Auxiliary Electrical, Pneumatic and Hydraulic Devices
7.104 Tests after Erection on Site
7.105 Measurement of Fluid Conditions after Filling on Site
8 Guide to the Selection of Metal-enclosed Switchgear and Controlgear for Service
8.1 Selection of Rated Values
8.2 Selection of Design and Construction
8.3 Internal Arc Classification
9 Information to be Given with Enquiries, Tenders and Orders
9.101 Information with Enquiries and Orders
9.102 Information with Tenders
10 Rules for Transport, Storage, Installation, Operation and Maintenance
10.1 Conditions during Transport, Storage and Installation
10.2 Installation
10.3 Operation
10.4 Maintenance
11 Safety
11.101 Procedure
11.102 Internal Arc Aspect
Annex A (Normative) Method for Testing the Metal-enclosed Switchgear and Controlgear under Conditions of Arcing due to an Internal Fault
Annex B (Normative) Partial Discharge Measurements
Annex C (Normative) Additional Requirements for Alternating-current Metal-enclosed Switchgear and Controlgear from 3.6kV to 40.5kV to Be Used in Severe Climatic Conditions
Annex D (Normative) Calculation Method of Cross Sectional Area of Bare Conductor in Accordance with Thermal Effect of Short-time Persistent Current
Annex E (Informative) Explanatory Notes
Bibliography
