Power Projects recently delivered a detailed Insulation Coordination Study for a 220/33 kV BESS project – ensuring lightning and switching surge protection aligned with IEC 60071 and CEA grid code.
This study was a key milestone in the project’s design phase, helping define protection levels for primary substation equipment and validating arrester ratings for surge protection.
Project Overview:
- Voltage Level: 220/33 kV
- Application: Grid-connected Battery Energy Storage System (BESS)
- Study Standards: IEC 60071-1, IEC 60071-2, CEA T&R Technical Standards
Scope of Work Included:
- Surge analysis for lightning and switching impulses
- Selection of protective level for equipment insulation (LIWL & SIWL)
- Arrester location and rating verification
- Overvoltage coordination for transformer and switchgear
- Modelling in PSCAD using EMTP-type simulations
Key Outcomes:
- Verified energy withstand margins for 220 kV and 33 kV terminals
- Recommended surge arresters ensured protection margins as per IEC 60071
- Voltage profile across insulation barriers validated under worst-case transient scenarios
- Coordination confirmed for fast front (lightning) and slow front (switching) surges
Insulation Coordination is critical for the longevity and reliability of high-voltage systems, especially for grid-scale energy storage and renewables.
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