Added considerations for secondary systems, digital control systems, and smart grid automation components within substation environments. Fundamental Design and Structural Requirements
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Ensuring installations function under intended conditions. iec 6193612021 link
The 2021 edition also integrates to harmonise design and erection procedures for HV power installations across all countries.
In many countries (EU via harmonized standards, Australia, Brazil, etc.), compliance with IEC 61936 is required by law for grid operators, industrial plant owners, and renewable energy farms to ensure . In many countries (EU via harmonized standards, Australia,
| | Amendment Requirement | | ---------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Normative References | EN 50522 (Earthing of power installations >1 kV AC) is explicitly added for CENELEC application. | | Definitions | A note is added pointing to EN 50110‑1/EN 50110‑2 for an additional definition of the danger zone (DL). | | Fundamental Requirements | Notes added referencing: Directive 2013/35/EU (electromagnetic field limits), EN 50160 (voltage characteristics), and EN 50341 / EN 50423 (overhead line and cable considerations). | | Safety Measures | Adds cross‑reference to EU Regulation No 517/2014 on fluorinated greenhouse gases where applicable. | | Earthing & Touch Voltages | - For CENELEC, the IEEE 80 curve (Annex C) is informative only; the permissible touch‑voltage curve in Figure 12 is the required reference (explicitly enforced in countries such as Austria and Germany). - Annex D (earthing design flow chart) and Annex C are informative. | | Safe Working Procedures | Notes added to Annex F referencing the EN 50110 series for danger/vicinity zone regulations. | | National Provisions | - Annex ZA (normative) : Lists special national conditions (e.g., minimum fence heights, barrier heights, cable burial depths, minimum clearances for specific countries). - Annex ZB (informative) : Lists A‑deviations where national law or regulation supersedes the EN. |
IEC 61936-1:2021 works in concert with several other critical standards: | | Fundamental Requirements | Notes added referencing:
: Overhead lines between separate installations, electrified railways, mining equipment, and medical equipment. IEC 61936-1:2021 CMV
IEC 61936-1:2021 works in close conjunction with IEC 61936-2 for earthing. The standard reinforces the requirement for Earth Potential Rise (EPR) calculations. It specifies that earthing systems must limit touch and step voltages to safe levels, explicitly accounting for fault currents from modern inverter-based resources (like solar and wind farms), which can have different fault characteristics than traditional rotating machines.
