GB/T 16935.4-2011 English PDF (GBT16935.4-2011)

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GB/T 16935.4-2011: Insulation coordination for equipment within low-voltage systems -- Part 4: Consideration of high-frequency voltage stress
GB/T 16935.4-2011
Insulation coordination for equipment within low-voltage systems. Part 4. Consideration of high-frequency voltage stress
ICS 29.120
K30
National Standards of People's Republic of China
Low voltage system equipment with the insulation
Part 4. high frequency voltage stress considerations
(IEC 60664-4..2005, IDT)
Posted on December 30,.2011
2012-05-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Directory
Preface Ⅰ
Introduction Ⅱ
1 range 1
2 Normative references 1
3 Terms and definitions 2
4 clearance 2
5 creepage distance 5
6 solid insulation 7
7 high-frequency test 9
8 non-sinusoidal voltage 11
Appendix A (Informative) Insulation characteristics of clearances at high frequency voltage 13
Appendix B (Informative) Insulation characteristics of creepage distance at high frequency voltage 18
Appendix C (Informative) Insulation characteristics of solid insulation under high frequency voltage 21
Appendix D (Normative) Insulation test at high frequency voltage 27
Appendix E (Informative) Insulation characteristics of non-sinusoidal high frequency voltage 38
Appendix F (Informative) Insulation Size Determination Block Diagram 43
References 45
Foreword
GB/T 16935 "Insulation coordination of equipment in low-voltage systems" is divided into the following four sections.
--- Part 1. Principles, requirements and tests;
--- 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 GB/T 16935 Part 4.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This section uses the translation method is equivalent to using IEC 60664-4..2005 "Insulation coordination of equipment within low-voltage systems Part 4. High-frequency voltage
Stress considerations. "
This section should GB/T 16935.1-2008 "Insulation coordination with low-voltage system equipment Part 1. Principles, requirements and testing"
(IEC 60664-1..2007, IDT) and GB/T 16935.5-2008 "Insulation coordination of equipment in low-voltage systems - Part 5. Not to exceed
2mm clearance and creepage distance determination method "(IEC 60664-5..2007, IDT) with the use.
This part is proposed by China Electrical Equipment Industry Association.
This part of the National Low Voltage Equipment Insulation Coordination Technical Committee (SAC/TC417) centralized.
This section is drafted. Shanghai Electric Apparatus Research Institute.
The main drafters of this section. Zhang Jianbing, leather bag, Wu Qingyun.
introduction
Low-voltage equipment can also produce higher voltage stress. Low-voltage device voltage frequency is usually 50/60Hz, but in some cases
Under, the low pressure system may have the higher voltage frequency (400Hz) or the lower frequency (162/3Hz) and the direct current voltage. A more special one
The situation is a high-power RF transmitter. The development of such devices has led to earlier research on the insulation resistance of devices under radio frequency conditions
However, the accompanying problems of high frequency voltage stress have not been given enough attention.
Currently, high frequency operating voltages in excess of 30 kHz are being applied to low voltage equipment more and more frequently, with high levels for the megahertz
The application of frequency voltage will also be gradually expanded. These high frequency voltages are often not sinusoidal. To miniature the electrical components and get the design high
Effective, you need to reduce the size of the insulation to a very small range, resulting in high voltage stress on the solid insulation.
At the same time of increasing the voltage frequency, the degradation effect of partial discharge on the performance of insulating material is also more obvious, and the two are roughly proportional.
Thus, the effect of partial discharge on the insulation size at high voltage frequencies is much more significant than at commercial frequencies.
As the voltage and frequency of higher and smaller and smaller insulation size, and this situation will be further intensified in the future, in order to ensure operator safety
Full and equipment reliability, the voltage stress formed by the high frequency voltage up to 100MHz should be considered in the insulation coordination of low voltage equipment
Among the issues.
This section provides an overview of some of the most important data on high frequency insulation stress and explains the effects of high frequency insulation stress on insulation materials and
The size of the impact, the provisions of the clearance, creepage distance and solid insulation data. This section also gives the test of high frequency stress
method.
Low voltage system equipment with the insulation
Part 4. high frequency voltage stress considerations
1 Scope
GB/T 16935 provisions of this part of the electrical equipment performance standards for the electrical equipment clearance, creepage distance and solid insulation
Request. This section contains the electrical test method of insulation coordination.
The provisions of this section the value of the minimum clearance does not apply to the presence of ionized gas situation, the special requirements for the case will be phase
Technical Committee regulations.
This section applies to low-voltage equipment to withstand high-frequency voltage stress of the basic insulation, additional insulation and reinforced insulation. Insulation in this section
The dimensional data applies directly to the basic insulation; for reinforced insulation, the additional requirements given in IEC 60664-1 apply; This section applies to base
Clearances, creepage distances, and solids at any type of periodic voltage at wave frequencies in the 30 kHz to 10 MHz range
Determination of insulation size.
This section should be used in conjunction with IEC 60664-1 or IEC 60664-5. Through the use of the above three criteria can be made
The voltage frequency limits of IEC 60664-1 and IEC 60664-5 are raised above 30kHz.
This section also applies to IEC 60664-3 and type 1 protection when the voltage frequency exceeds 30kHz. For type 2 protection
Still under consideration.
Note 1. Size data in the frequency range over 10 MHz is under consideration.
Note 2. This section did not consider the main circuit of high-frequency radiation. In the normal use of equipment, it is generally believed that the radiation emitted to the main circuit of the high-frequency voltage formed
The interference is insignificant compared with the insulation stress, so it can not be considered.
This section applies to the application of altitude not exceeding.2000m environment, the rated voltage does not exceed the exchange of 1000V electrical equipment.
This section does not apply to the following situations.
--- In a liquid environment;
--- In addition to air outside the gas environment;
--- In compressed air.
Note 3. There may be higher voltages in the internal circuits of electrical equipment.
NOTE 4 The requirements for applications above.2000 m above sea level may be given in Table A.2 of IEC 60664-1 Annex A.
This section aims to provide guidance to the technical committee responsible for various electrical equipment standards to coordinate the requirements of each equipment so that
In the provisions of the air gap, creepage and solid insulation can achieve the purpose of insulation.