Substation Grounding Grid Design Patents: Who Files, and Where the Field Is Still Open
Filing nearly tripled in three years: documented filings rose from 10 in 2021 to 28 in 2024, a +180% increase, before publication lag starts to understate the most recent years. Documented filings moved from 5 in 2017 to a peak of 45 in 2025, with the strongest sustained growth between 2021 (10) and 2024 (28), a +180% rise over that span. 2026 figures are partial and will understate final volume once publication lag closes.
- 1STATE GRID CORPORATION OF CHINA27
- 2FLUKE CORP16
- 3ISENSPRO NV14
- 4STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER CO12
- 5EAST CHINA ELECTRIC POWER TEST & RES INST10
See the full substation grounding grid design analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on grounding grid design patents
How many patents cover substation grounding grid design?
This dataset identifies 260 published records in scope between 2015 and the 2026 cut-off, searched against grounding grid, earthing system and ground potential rise terms combined with step/touch voltage, soil resistivity, conductor sizing, corrosion and impedance measurement terms. That figure covers a specific technical scope rather than every patent that touches substation earthing generally, so a broader or narrower search string would return a different count. Treat 260 as the size of this defined field, not as an absolute total for the entire domain.
Who are the leading patent filers in grounding grid technology?
Filing is concentrated at the top: the leading assignee holds 27 records, and the top 5 assignees combined account for 30.4% of all 260 records in scope, with the top 10 reaching 46.5%. That still leaves more than half the field held by a long tail of single- or low-filing entrants, many of them regional Chinese power companies and research institutes. Cumulative rank and recent-year activity diverge in this dataset, so checking a filer's latest-year filings alongside its total count gives a more current picture than the ranking alone.
Is patent filing in this field growing or slowing down?
Filing grew sharply through 2024: documented filings rose from 10 in 2021 to 28 in 2024, a +180% increase over that span, and the peak year so far is 2025 at 45. Figures for 2025 and 2026 should not be read as a slowdown, because publication lags filing by roughly 18 months and recent-year counts are still filling in as more applications publish. The honest read is that the field was accelerating through the last fully-settled year, 2024, with more recent years still incomplete.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Substation Grounding Grid Design covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.