标准摘要
[中文适用范围]： IEC61557 的这一部分规定了对绝缘监测装置 (IMD) 的要求，该装置永久监测未接地 IT 交流系统的对地绝缘电阻、标称电压高达 1000V 交流电连接直流电路的 IT 交流系统以及未接地的 IT 交流系统。 IT 直流系统的电压高达 1 500V dc，与测量方法无关。注 1“IEC 60364-4-41 及其他文献中描述了 IT 系统。应注意其他标准中选择的设备的附加数据。注 2”各种标准规定了 IT 系统中绝缘监控设备的使用。在这种情况下，设备的目的是发出绝缘电阻降至最低限值以下的信号。注 3——符合 IEC61557 本部分的绝缘监测装置也可用于断电电气系统。 [外文原描述]： This part of IEC 61557 specifies the requirements for insulation monitoring devices (IMD) which permanently monitor the insulation resistance to earth of unearthed IT a.c. systems, for IT a.c. systems with galvanically connected d.c. circuits having nominal voltages up to 1 000 V a.c., as well as of unearthed IT d.c. systems with voltages up to 1 500 V d.c. independent from the method of measuring. This second edition cancels and replaces the first edition published in 1997. This edition constitutes a technical revision. The following changes were made with respect to the previous edition: a) definitions complemented; b) revision of some requirements; c) addition of information on operating instructions; d) sections "type tests" and "routine tests" complemented; e) modification of Table 1; f) addition of Annexes A and B. The contents of the corrigendum of May 2007 have been included in this copy.
英文名称Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 8: Insulation monitoring devices for IT systems