CAES Protection & Safety Patent Snapshot 2026
The patent corpus for CAES protection and safety is nascent, comprising just 3 patent families, all filed in China and concentrated entirely in two co-filing institutions. Activity emerged only from 2022 onward, signalling a field at the earliest formation stage with no established international competition.
Two Chinese institutions hold all filings in this nascent field
Huazhong University of Science and Technology and State Grid Hubei Electric Power Research Institute each appear across all 3 patent records in scope, making the evidence snapshot maximally concentrated. No other applicant is ranked in the top 100.
The top five filers account for 100% of the ranked applicants visible in this query’ combined total — an unusually complete concentration that reflects the field’s very early stage rather than deliberate strategic enclosure.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | HUAZHONG UNIV OF SCI & TECH | 3 | |
| 2 | State Grid Hubei Electric Power Research Institute | 3 |
The shared leadership position of an academic institution and a grid operator suggests that CAES protection research is currently driven by a tightly coupled academic-industry partnership rather than commercial product developers.
Because patent applications typically publish 18–24 months after filing, activity in 2024–2026 is likely under-counted in the current dataset; the true recent filing rate may be higher than the trend line suggests. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filings emerged in 2022 and remain sporadic; protective circuits dominate the technology mix
The two charts below capture when activity appeared and which IPC branches it clusters around, providing context for where technical attention has and has not been directed.
Annual filing trend
No filings appear before 2022; two records were filed in 2022 and one in 2024, with all other years at zero. Given publication lag, the 2024 data point and beyond should be treated as a floor, not a ceiling. The pattern is best read as an emerging field with irregular early-stage output rather than any meaningful trend.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H02H (protective circuit arrangements) covers all 3 patent records, confirming it as the defining technical route. G01R (electric and magnetic measurement), G06F (digital data processing), and H02J (power supply and grid systems) each appear once, indicating these are secondary or supporting branches rather than independent focus areas.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
基于波形相似度的压缩空气储能电站主变压器零序差动保护方法
本发明提供一种基于波形相似度的压缩空气储能电站主变压器零序差动保护方法，包括：基于零模涌流和近似环流的波形相似度提出零模涌流识别判据，基于变压器三相的饱和系数提出内部故障识别判据，并综合零模涌流识别判据和内部故障识别判据实现对零序差动保护的正确闭锁，使得在和应涌流及空投于内部故障情况下变压器均能正确动作。通过本发明，能够在压缩空气储能电站主变压器和应作用下空投、空投于内部故障等复杂情况下，有效解决变压器零序差动保护误动的问题，同时具备简捷可靠、易操作、适用性强等特点。 (excerpt from the patent abstract)
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
Assignee snapshot from the current evidence set
The applicants below are visible in this query result. Because the evidence set is relatively small, read this section as a directional snapshot rather than a full competitive ranking.
Huazhong University of Science and Technology
Holds 3 patent records, all co-filed with State Grid Hubei Electric Power Research Institute. Technology focus sits squarely in H02H 1 and H02H 7 (protective circuit arrangements), with one record extending into G01R 19 (electric and magnetic measurement). Momentum is classified as a new entrant, consistent with the university’s first appearance in this topic in 2022.
patent records: 3State Grid Hubei Electric Power Research Institute
Also holds 3 patent records with an identical technology profile — H02H 1 and H02H 7 as primary branches and G01R 19 as a secondary branch. As the grid-operator partner in the joint filings, this institute represents the operational and deployment perspective within the collaboration. Momentum is also classified as a new entrant.
patent records: 3Frequently asked questions
The current evidence covers 3 patent families in scope. This is a very small corpus, indicating the field is at an early formation stage with limited prior art to navigate.
Huazhong University of Science and Technology and State Grid Hubei Electric Power Research Institute each appear across all 3 patent records. They are co-applicants on the same filings rather than independent competitors.
H02H (protective circuit arrangements) is the visible branch, covering all 3 patent records. G01R (electric and magnetic measurement), G06F (digital data processing), and H02J (power supply and grid systems) each appear in 1 record as secondary branches.
No. All 3 patent records in the current dataset are filed in China only. There is no visible international family extension into other jurisdictions, leaving non-Chinese markets without existing protective circuit IP in this specific topic.
The first filings in the dataset appear in 2022, with 2 records that year and 1 in 2024. All years before 2022 show zero activity, confirming this is a very recently emerged research area.
The only collaboration on record is a single dyadic partnership between State Grid Hubei Electric Power Research Institute and Huazhong University of Science and Technology, who have co-filed 3 patent records together. No other collaborative relationships are present in the evidence.
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Disclaimer. This page is generated from PatSnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
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