IEC 60076-25:2023适用于干式自然风冷电阻器，用于变压器和发电机的中性点接地，以通过金属电阻元件限制电力系统中的接地故障电流。 出于本文件的目的，电阻器可以是: 单独使用或与本文件未涵盖的其他电工产品组合使用，例如（但不限于）:降压单相变压器、开口三角形或之字形变压器（中性点不可用）和彼得森线圈电抗器（以增加对故障的有功功率贡献或减少正确保护操作的时间常数或两者兼而有之）； 一次性设计、制造和验证或完全标准化和批量制造。 可以使用术语“中性接地电阻”(NGR)和“中性接地电阻”(NER)。然而，出于本文件的目的并且为了避免与“中性点接地电抗器”(NER)的任何混淆，使用术语“中性点接地电阻器”(NGR)。 本文件规定: NGR的特点； NGR的服务条件要求； 确认满足这些条件的试验和试验方法； 与NGR标记相关的要求。 附录A提供了如何考虑电阻随温度变化的影响的指南。

IEC 60076-25:2023 applies to dry type natural air-cooled resistors, for neutral grounding of transformers and generators, in order to limit the earth fault current in power systems by means of metallic resistive elements.
For the purposes of this document, the resistor can be:

• used alone or in combination with other electrotechnical products not covered by this document, such as (but not limited to): a step-down single-phase transformer, an open triangle or zig-zag transformer (where the neutral point is not available) and a Petersen coil reactor (in order to increase active power contribution to the fault or reduce time constant for proper protection operation or both);
• designed, manufactured and verified on a one-off basis or fully standardized and manufactured in quantity.

Both terms "neutral grounding resistor" (NGR) and "neutral earthing resistor" (NER) can be used. However, for the purposes of this document and in order to avoid any confusion with "neutral earthing reactor" (NER), the term "neutral grounding resistor" (NGR) is used.
This document specifies:

• the characteristics of the NGR;
• the service conditions requirements for NGRs;
• the tests and test methods for confirming that these conditions have been met;
• the requirements relating to marking for NGRs.

Annex A provides guidance on how to consider the effect of resistance variation with temperature.