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GB/T 16935.1-2008 English PDF (GBT16935.1-2008)

GB/T 16935.1-2008 English PDF (GBT16935.1-2008)

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GB/T 16935.1-2008: Insulation coordination for equipment within low-voltage systems -- Part 1: Principles, requirements and tests

GB/T 16935.1-2008
Insulation coordination for equipment within low-voltage systems. Part 1. Principles, requirements and tests ICS 29.120
National Standards of People's Republic of China
GB/T 16935.1-2008/IEC 60664-1..2007
Replacing GB/T 16935.1-1997
Low voltage system equipment with the insulation
Part 1. Principles, requirements and tests
(IEC 60664-1..2007, IDT)
2008-12-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released
Preface Ⅰ
1 Scope and purpose 1
2 Normative references 1
3 Terms and definitions 2
4 insulation with the basic principles of 7
5 Requirements and rules for sizing 13
6 Tests and measurements 19
Appendix A (Informative) Basic parameters of the tolerance characteristics of the gap 31 Appendix B (Informative) Different over-voltage control of the power supply system nominal voltage 36 Appendix C (Normative) Partial discharge test method 38
Appendix D (Informative) Partial discharge test method Supplementary information 42 Appendix E (informative) Table F. Creepage distance specified in Table 4 and Table A. 1 in the electrical gap comparison 44 Appendix F (Normative) Table 45
References 54
GB/T 16935.1-2008/IEC 60664-1..2007
GB/T 16935 "Insulation coordination of equipment in low-voltage systems" is expected to be divided into five parts. --- Part 1. Principles, requirements and tests;
--- Part 2. Application Guide;
--- Part 3. The use of coating, sealing and molding anti-fouling protection; --- Part 4. high frequency voltage stress considerations;
--- Part 5. Determination of clearances and creepage distances not exceeding 2mm. This section identical with IEC 60664-1..2007 "Insulation coordination with low-voltage system equipment Part 1. Principles, requirements and testing." This standard replaces standard. GB/T 16935.1-1997.
This section compared with GB/T 16935.1-1997, the main technical differences exist. --- Increased the Japanese grid single-phase system nominal voltage 100V or 100V ~.200V, relates to the rated impulse voltage, rationalization Voltage and different over-voltage control of the nominal voltage of the power supply system; --- In Table A 1 increased the tolerance of less than 0.01mm gap characteristics of the basic parameters; --- Added Table F 7 "Tolerance to steady-state voltage, temporary over-voltage or reproduction of peak voltage clearance"; --- Table F 4 Increases the minimum creepage distance relative to the rms value of 12500V to 63000V; --- Modify the original Figure 1 "Material Group Ⅰ to determine the size of creepage distances with voltage and pollution level", and as Appendix E Content, diagram title changed to "creepage distance specified in Table F.4 and Table A.1 electrical clearance comparison"; --- Modify the provisions relating to the creepage of the tendons, an increase of Figure 2 "determine the width and height of the ribs"; --- Modify Table F 5 (formerly titled "Test Voltages for Verification of Clearances at Sea Level") is replaced by "Verification of electrical work at different elevations Gap test voltage "), an increase of.200m above sea level, 500m at the test voltage value; --- Modify the original Chapter 4 (now Chapter 6) "Test and Measurement", the test, the purpose of the test and test equipment and possible alternative tests Described in more detail;
--- The original Appendix A, Appendix B, Appendix D is a normative appendix, now according to IEC into an informative appendix; --- Deleted and verify the clearance has nothing to do 2U + 1000V for 1min dielectric test; --- Table F 4 and the original 4.2 (now 6.2) to delete the pollution level 4. This part of the Appendix C and Appendix F normative appendix, Appendix A, Appendix B, Appendix D and Appendix E is an informative annex. This part is proposed by China Electrical Equipment Industry Association. This part of the National Standardization Technical Committee of low-voltage electrical (SAC/TC189) centralized. This section is responsible for drafting unit. Shanghai Electric Institute of Science (Group) Co., Ltd.. Participated in the drafting of this section. Hang Shen Holdings Group Co., Ltd., Zhejiang Delixi Electric Co., Ltd., Zhejiang Chint Electric shares Limited, Schneider Electric (China) Investment Co., Ltd.
The main drafters of this section. Huang Jingye, Wu Qingyun, Li Hui.
Participate drafters of this section. He Guibing, Huang Rongrong, Ye Sufeng, Zhang Ping. This part of the standard replaces the previous editions are. GB/T 16935.1-1997. GB/T 16935.1-2008/IEC 60664-1..2007
Low voltage system equipment with the insulation
Part 1. Principles, requirements and tests
1 Scope and purpose
GB/T 16935 provisions of this part of the low-voltage system equipment insulation coordination, this section applies to altitude to.2000m, rated power Pressure to 1000V, rated frequency to 30kHz or DC to 1500V equipment.
According to the equipment performance standards, this part of the provisions of the equipment clearances, creepage distances and solid insulation requirements. This part of the package Including the insulation with the electrical test methods.
The minimum electrical clearance specified in this section does not apply to have ionized gas Department. Special requirements for this situation can be met by the corresponding product Standard Technical Committee to deal with their own products.
This section does not involve determining the following distances.
--- through the liquid insulation;
--- Pass gas other than air;
--- By compressed air.
Note 1. Insulation coordination of equipment within the low-voltage system of rated frequency above 30kHz according to IEC 60664-4. Note 2. The internal circuitry of the device may exhibit higher voltages. Note 3. The guidelines for determining the size above.2000m above sea level are shown in Table A. 2. This section is the basic electrical safety standards, designed to guide the technical committee responsible for product standards for its various equipment responsible for the development of The requirements, to achieve the purpose of insulation.
This section for each product standard technical committee to determine the equipment in the air gap, creepage distance and solid insulation provided the necessary Guidance information.
Manufacturers and product standards Technical Committee has the responsibility to apply the requirements of the basic safety standards, if necessary, standard equipment Cite these requirements.
If the relevant product standard does not specify the values of clearances, creepage distances and the requirements for solid insulation, or in the absence of standards Under this section applies.
2 Normative references
The following documents contain provisions which, through the reference in this part of GB/T 16935.1, become the provisions of this section. Any reference to date Documents, all subsequent Amendments (not including errata content) or revisions do not apply to this section, however, this section is encouraged to promote The parties to the agreement study whether the latest versions of these documents are available. For undated references, the latest version applies to this book section.
GB 156-2003 standard voltage (neqIEC 60038-1983)
GB/T 1408.1-2006 Insulating materials electrical strength test methods - Part 1. Test under power frequency (idt IEC 60243-1. 1998)
GB/T 2421-1999 Environmental testing for electric and electronic products Part 1. General (idt IEC 60068-1. 1988) GB/T 2423.2-2001 Environmental testing for electric and electronic products Part 2. Test methods Test B. High temperature (idt IEC 60068-2-2. 1974)
GB/T 2423.3-2006 Environmental testing for electric and electronic products Part 2. Test methods Test Cab. constant hot and humid test (Idt IEC 60068-2-78..2001)
GB/T 2423.22-2002 Basic environmental testing for electric and electronic products Part 2. Test methods Test N. Temperature change GB/T 16935.1-2008/IEC 60664-1..2007
(Idt IEC 60068-2-14. 1984)
GB/T 2900.5-2002 Electrotechnical terminology Insulating solids, liquids and gases (eqv IEC 60050 (212)..1990) GB/T 2900.57-2002 Electrotechnical terminology Generation, transmission and distribution operations (eqv IEC 60050 (604). 1987) GB/T 4207-2003 solid insulating materials in comparison with the damp conditions of the tracking index and resistance to tracking index (Idt IEC 60112. 1979)
GB/T 7354-2003 partial discharge measurement (idt IEC 60270..2000)
GB/T 11021-1989 Thermal insulation and classification of electrical insulation (eqv IEC 60085. 1984) GB/T 16499-1996 Guidelines for the preparation of electrical safety standards (IEC Guide 104. 1984) GB/T 17045-2006 Shock protection devices and equipment common part (idt IEC 61140..2001) GB/T 17627.1-1998 high voltage test techniques for low voltage electrical equipment - Part 1. Definitions and test requirements (eqv IEC 61180-1..1992)
GB/T 17627.2-1998 high voltage test techniques for low voltage electrical equipment Part II. Measurement systems and test equipment (Eqv IEC 61180-2..1994)
IEC 60050 (151)..2001 International Electrotechnical Vocabulary (IEV) Chapter 151 Electrical and magnetic devices IEC 60050 (826)..2004 International Electrotechnical Vocabulary (IEV) Chapter 826. Electrical installations IEC 60085..2004 Electrical insulation - Thermal classification
Surge arresters - Part 1. Gap valve surge arresters for ac systems
IEC 60112..2003 Solid insulating materials compared to the tracking under the dawning index and tracking resistance index method IEC 60216 (all parts) Electrical Insulation Materials Heat Resistance
IEC 60364-4-44..2001 Electrical installations of buildings - Part 4-44. Safety protection Voltage disturbances and protection against electromagnetic interference Amendment 1 (2003)
IEC 60664-4..2005 Insulation coordination of equipment in low voltage systems - Part 4. Considerations for high frequency voltage stress IEC 60664-5..2007 Insulation coordination of equipment in low-voltage systems - Part 5. Clearances and creepage distances up to 2 mm Determination of distance 1)
IEC Guide 104..1997 Preparation of Safety Publications and Applications of Basic Safety and Professional Safety Publications 3 Terms and definitions
1) The new version of IEC 60664-5 (2nd edition) quoted by IEC 60664-1..2007 at the time of publication has not yet been published and is now published in July.2007. This section uses the following definition.
The interdependence of the insulation properties of electrical equipment is considered in the context of the expected micro-environment and other effects. Note. According to the characteristics specified in 3.5 to 3.7 to represent the expected voltage stress. 3.2
The shortest distance between two conductive parts in the air.
The shortest distance between two conductive parts along the solid insulating material surface. (IEV151-15-50)
Solid insulating material inserted between two conductive parts.
GB/T 16935.1-2008/IEC 60664-1..2007
The maximum rms value of ac voltage or d.c. voltage that may be generated at any given insulation across the equipment at rated voltage. Note 1. Does not consider the transient phenomenon.
Note 2. Both open and normal operation should be considered.
The maximum peak value at which the voltage waveform is periodically shifted due to the AC voltage distortion or due to the AC component superimposed on the DC voltage Voltage.
Note. Random overvoltages (eg due to over-voltage due to occasional operation) are not considered to reproduce the peak voltage. 3.7
Any voltage that peaks above the corresponding peak of the maximum steady-state voltage during normal operation. 3.7.1
Power overvoltage that lasts for a relatively long time (corresponding to instantaneous overvoltage). 3.7.2
Oscillatory or non-oscillating, usually high-damping short duration overvoltages of only a few milliseconds or less. (IEV604-03-13)
Instantaneous overvoltage that occurs at any point in the system due to a specific on-off operation or fault continuity. 3.7.4
Due to a specific lightning discharge, transient overvoltages occur anywhere in the system. 3.7.5
For the function of the appliance, a conscious application of overvoltage. 3.8
The voltage applied to the sample under the specified test conditions does not cause breakdown and/or flashover of the sample. (IEV212-01-31)
Under specified conditions, does not cause insulation breakdown, with a certain shape and polarity of the peak value of the impact voltage. 3.8.2
Under specified conditions, does not cause insulation breakdown of the maximum RMS voltage. 3.8.3
Under specified conditions, does not cause the breakdown voltage of the highest peak voltage. GB/T 16935.1-2008/IEC 60664-1..2007
Under specified conditions, does not cause insulation breakdown of the maximum transient over-voltage value. 3.9
The manufacturer's specified voltage level for components, appliances or equipment, which is related to characteristics such as operation (including operation) and performance. Note. The equipment may have more than one rated voltage or may have a rated voltage range. 3.9.1
The manufacturer's tolerance voltage rating of the equipment or its components to characterize the (long-term) resistance of their insulation. Note. The rated insulation voltage is not necessarily equal to the rated voltage of the equipment. The rated voltage is mainly related to the operation of equipment. 3.9.2
The manufacturer's specified impulse withstand voltage values for the equipment or parts thereof to characterize the insulation's ability to withstand transient overvoltages. 3.9.3
The manufacturer specifies the equipment or its components to reproduce the peak withstand voltage value to characterize the insulation withstand voltage ability.
Manufacturer's temporary tolerance to equipment or its components overvoltages to characterize the short-term withstand voltage capability of their insulation. 3.10
Use numbers to describe transient overvoltage conditions.
Note 1. Overvoltage category I, II, III and IV, see
Note 2. The term "overvoltage category" is synonymous with "shock-tolerant category" used in 443 of IEC 60364-4-44. 3.11
Any combination of foreign substances (solids, liquids, or gases) that reduce the electrical strength and surface resistivity of insulation. 3.12
Surroundings that may affect the performance of the device or system.
Note. such as pressure, temperature, humidity, pollution, radiation and vibration. (IEV151-16-03, modified)
Equipment installation or use of the room or other places of the environment. 3.12.2
In particular, it will affect the environment near the insulation that determines the size of the creepage distance. 3.13
Digital representation of the micro-environment by the expected degree of pollution. Note. Pollution levels are indicated by 1, 2, 3 and 4, see 4.6.2.
GB/T 16935.1-2008/IEC 60664-1..2007
For example, the radius of each ball between two balls is greater than the electric field (uniform electric field) with a substantially constant voltage gradient across the electrodes Electric field from the distance.
Note. Uniform electric field conditions are referred to as Case B.
The voltage gradient between the electrodes is not substantially constant (non-uniform electric field). Note. The worst-case non-uniform electric field conditions for the tip-to-planar electrode structure with regard to voltage tolerance are referred to as Case A. It can be made by one A spot electrode with a radius of 30 μm and a plane electrode of 1 m × 1 m. 3.16
Expected within the electrical system transient over-voltage is limited to the required level conditions. 3.17
Electrical products used to separate conductive parts with different potentials. (IEV212-01-05)
The conductive parts are only suitable for the insulation required for the specific function of the equipment. 3.17.2
Set on hazardous live parts to provide basic protection of the insulation. Note. This concept does not apply to insulation specifically for functional purposes. (IEV826-12-14)
In addition to the basic insulation used for fault protection, separate insulation is additionally provided. (IEV826-12-15)
Insulation consisting of both basic and additional insulation.
Set on hazardous live parts, providing insulation equal to the degree of electrical shock protection of double insulation. Note. Reinforced insulation may have multiple layers, and these levels can not be tested individually with or without basic insulation. (IEV826-12-17)
Part of the bridge insulation discharge at both ends.
GB/T 16935.1-2008/IEC 60664-1..2007
The charge that can be measured at the test terminal.
Note 1. Apparent charge is less than the partial discharge.
Note 2. The apparent charge requirement requires a short circuit condition at the test terminal (see D.2). 3.18.2
The amount of apparent charge as a limit under this section.
Note. The maximum pulse should be calculated.
The apparent number of pulses per second that is greater than the measured level. Note. In the context of this section, pulse repetition rate is not allowed to estimate the discharge. 3.18.4
When the test voltage rises higher than the lower limit of the discharge did not occur, while the apparent charge is greater than the specified minimum discharge test voltage peak. Note. For the exchange test, available RMS.
When the test voltage drops below the upper limit of discharge, and the apparent charge is less than the specified minimum discharge test voltage peak. Note. For the exchange test, available RMS.
Test voltage peak value used in Test procedure in which the apparent charge is less than the specified discharge capacity. Note. For the exchange test, available RMS.
In accordance with established procedures, technical operations to determine one or more characteristic values for a given product, process or service. (ISO /IEC Guide 2..1996, 13.1) 2)
NOTE - The characteristics or properties of an entity are measured or classified by applying a set of environmental and operating conditions and/or testing to an entity. (IEV151-16-13)
A test of one or more appliances manufactured according to a design to demonstrate that the design complies with certain specifications. 3.19.2
Each appliance is manufactured and/or post-manufactured to determine if it meets certain criteria. 2) References in square brackets refer to references.
GB/T 16935.1-2008/IEC 60664-1..2007
A number of electrical appliances randomly selected from a number of tests carried out. 3.20
When the discharge is completely bridged, insulation fails under electrical stress, causing the voltage drop across the electrodes to approach zero. 3.20.1
Electrical breakdown in gas or liquid media.
Electrical breakdown along a solid insulating surface in a gas or liquid medium. 3.20.3
Electrical breakdown through solid insulation.
4 insulation with the basic principles
4.1 Overview
Insulation c...

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