低压系统内设备的绝缘配合.第4部分:高频电压应力的考虑

[中文适用范围]： IEC 60664 的这一部分涉及低压设备内承受高频电压应力的基本绝缘、附加绝缘和加强绝缘。尺寸值直接适用于基本绝缘；对于加强绝缘，根据第 1 部分适用附加要求。它适用于基频高于 30 kHz 且高达 10 MHz 的任何类型周期性电压所施加的电气间隙、爬电距离和固体绝缘的尺寸标注。 IEC 60664 的这一部分只能与 IEC 60664-1 或 IEC 60664-5 一起使用（在本标准中称为第 1 部分或第 5 部分）。通过将第 1 部分或第 5 部分与本部分一起使用，第 1 部分或第 5 部分的频率限制扩展到高于 30 kHz 的频率。本部分也适用于频率大于 30 kHz 和类型 1 保护的第 3 部分。对于类型 2 保护，该问题正在考虑中。注 1：10 MHz 以上频率的尺寸值正在考虑中。注 2：本标准不考虑对电源的高频发射。在设备的正常使用中，假设发射到电源的高频电压的干扰相对于绝缘应力可以忽略不计。因此没有必要考虑它。它适用于海拔不超过2 000 m、额定电压不超过交流1 000 V的设备。它根据设备的性能标准规定了电气间隙、爬电距离和固体绝缘的要求。它包括有关绝缘协调的电气测试方法。本部分规定的最小间隙不适用于出现电离气体的地方。相关技术委员会可酌情规定此类情况的特殊要求。本部分不涉及距离 - 通过液体绝缘， - 通过空气以外的气体， - 通过压缩空气。注3：设备内部电路可能存在较高电压。注4：海拔超过2 000 m的要求可从第1部分附录A的表A.2中得出。本标准的目的是指导负责不同设备的技术委员会合理化其要求，从而实现绝缘协调当指定设备的空气间隙、爬电距离和固体绝缘时。 [外文原描述]： IEC 60664-4:2005 Deals with basic, supplementary and reinforced insulation subjected to high-frequency voltage stress within low-voltage equipment. The dimensioning values directly apply for basic insulation; for reinforced insulation additional requirements apply according to Part 1. It is applicable for the dimensioning of clearances, creepage distances and solid insulation stressed by any type of periodic voltages with a fundamental frequency above 30 kHz and up to 10 MHz. This part of IEC 60664 can only be used together with IEC 60664-1 or with IEC 60664-5 (in this standard called Part 1 or Part 5). By using Part 1 or Part 5 together with this part the frequency limit of Part 1 or Part 5 is extended to frequencies higher than 30 kHz. This part also applies to Part 3 for frequencies greater than 30 kHz and protection of type 1. For type 2 protection this question is under consideration. Applies to equipment for use up to 2 000 m above sea level having a rated voltage up to a.c. 1 000 V. Specifies the requirements for clearances, creepage distances and solid insulation for equipment based upon their performance criteria. lt includes methods of electric testing with respect to insulation coordination. The minimum clearances specified in this part do not apply where ionized gases occur. Special requirements for such situations may be specified at the discretion of the relevant technical committee. This part does not deal with distances - through liquid insulation, - through gases other than air, - through compressed air. The object of this standard is to guide technical committees responsible for different equipment in order to rationalise their requirements so that insulation coordination is achieved when specifying clearances in air, creepage distances and solid insulation for equipment. The major changes made during the revision of IEC 60664-4 were the following: - inclusion of more recent information about the withstand characteristics of insulation at high-frequency voltage stress (see Annexes A, B and C); - inclusion of requirements for the dimensioning of clearances at high-frequency voltage stress (see Clause 4); - inclusion of requirements for the dimensioning of creepage distances at high-frequency voltage stress (see Clause 5); - inclusion of requirements for the dimensioning of solid insulation at high-frequency voltage stress (see Clause 6); - inclusion of diagrams to provide guidance on dimensioning with respect to high-frequency voltage stress (see Annex F); specification of tests with respect to high-frequency voltage stress (see Clause 7); - inclusion of test circuits for high-frequency voltage withstand testing and partial discharge testing (see Annex D.1 and D.2.1); - inclusion of design criteria for partial discharge test circuits at high-frequency voltage (see Annex D.2.2); - inclusion of criteria for dealing with non sinusoidal voltage stress (see Clause 8 and Annex E).