GB/Z 16935.2-2013 Insulation coordination for equipment within low-voltage systems—Part 2-1:Application guide—Explanation of the application of the IEC 60664 series, dimensioning example and dielectric testing
Insulation coordination for equipment within low-voltage systems—Part 2-1:Application guide—Explanation of the application of the IEC 60664 series, dimensioning example and dielectric testing
This part serves as an application guide specifying dimensioning requirements in accordance with GB/T 16935 series.
The significant items for consideration are as follows:
a) nominal system voltage(s) or rated insulation voltage(s);
b) overvoltage category of the products (OV cat.);
c) any type of overvoltages;
d) frequency of the voltage;
e) characteristics of the solid insulating material;
f) pollution degree and humidity levels.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 16895.10-2010 Low-voltage Electrical Installations - Part 4-44: Protection for Safety - Protection against Voltage Disturbances and Electromagnetic Disturbances (IEC 60364-4-44:2007, IDT)
GB/T 16935.1-2008 Insulation Coordination for Equipment within Low-voltage Systems - Part 1: Principles Requirements and Tests (IEC 60664-1:2007, IDT)
GB/T 16935.3-2005 Insulation Coordination for Equipment within Low-voltage Systems - Part 3: Use of Coating, Potting or Moulding for Protection against Pollution (IEC 60664-3:2003, IDT)
GB/T 16935.4-2011 Insulation Coordination for Equipment within Low-voltage Systems - Part 4: Consideration of High-frequency Voltage Stress (IEC 60664-4:2005, IDT)
GB/T 16935.5-2008 Insulation Coordination for Equipment within Low-voltage Systems - Part 5: Comprehensive Method for Determining Clearances and Creepage Distances Equal to or Less than 2mm (IEC 60664-5:2007, IDT)
GB/T 17045-2008 Protection Against Electric Shock - Common Aspects for Installation and Equipment (IEC 61140:2001, IDT)
IEC 60085:2007 Electrical Insulation - Thermal Evaluation and Designation
IEC 60112:2003 Method for the Determination of the Proof and the Comparative Tracking Indices of solid Insulating Materials
Amendment 1 (2009)
IEC 60216 (All Parts) Electrical Insulating Material - Property of Thermal Endurance
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
Note: All definitions can be found in the various parts of the GB/T 16935 series, as indicated below.
3.1
approximately homogeneous field
for frequencies exceeding 30kHz the field is considered to be approximately homogeneous when the radius of curvature of the conductive parts is equal or greater than 20% of the clearance
[GB/T 16935.4-2011, 3.1]
3.2
base material
insulating material upon which a conductive pattern may be formed
