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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/high-voltage-equipment-patent-landscape-patent-landscape/ · Patsnap · data cut-off 2026-08-31 · downloaded from the live page
Patent Landscape · Power Electronics & Electrical EquipmentHigh-Voltage Equipment Patents: Who Leads and Where Filings Are Heading
- Concentrated at the top. the five most active filers account for 31.6% of all 1,422 records in scope, and the top ten hold 41.6% — filing is real but not locked up by a single entrant.
- Switching and protection dominate the claim space. H01H switches & relays (26.1%) and H02J power supply & grid systems (24.4%) are the two largest IPC subclasses, ahead of measurement and protective-circuit filings.
- Filing activity has cooled from its 2017 peak. filings ran from 62 in 2017 to 36 in 2021, then to 18 by 2024 — a 50% decline over that three-year span, though the most recent years are still filling in as publications catch up.
1,422
Published Records
32%
Top-5 Share of All Records
-50%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (36 records) with 2024 (18) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 1,422 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This landscape draws on 1,422 published records matching high-voltage equipment terms — switchgear, high-voltage apparatus — alongside functional claim language covering switching frequency, power stage design, current sensing, control circuits, thermal management and fault protection. The scope spans 2015 through the 2026 data cut-off, capturing both established switchgear and substation filings and newer entrants building sensing and control layers on top of that hardware.
Patent families, not raw document counts, are the fairer unit for judging how contested a claim area is, since families neutralise repeat continuation filings and multi-jurisdiction duplicates. The ranking and shares below use that family-level view throughout.
Filing activity and technology composition, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on High-Voltage Equipment Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The Numbers
Filing trends and technology composition
Two views matter here: how filing volume has moved year over year, and how claims split across IPC subclasses. Both are drawn directly from the 1,422 records in scope, with no extrapolation beyond what is published.
Filing trend, 2017–2026
Filings peaked in 2017 at 62 and declined to 18 by 2024, a 50% drop across that three-year stretch. Because publication typically lags filing by around 18 months, the 2025–2026 figures (down to 4 in 2026) are still incomplete and should not be read as a continued fall.
IPC subclass composition
H01H (switches & relays) and H02J (power supply & grid systems) each cover roughly a quarter of records, with G01R measurement and H02H protective circuits tied at 16.8%. Because records can carry multiple IPC codes, these shares sum to well over 100% of the 1,422-record base — that overlap itself signals how often sensing, protection and switching claims are bundled into a single filing.
Shares are the percentage of the 1,422 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on High-Voltage Equipment Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.
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Most-cited records and a representative filing
Representative Filing
US5652521A — Insulation monitoring system for insulated high voltage apparatus
BBA CANADA LIMITED
A non-ferrous current sensor continuously measures charging current magnitude in step-graded foil, paper and capacitive insulation systems used on high-voltage measurement and control apparatus, including instrument transformers and condenser bushings of power transformers and circuit breakers. An electronic circuit conditions the low-voltage measured signal to modulate a DC signal in a system current control loop, giving continuous remote monitoring and alarm functions. Remote power reaches the sensor and conversion circuitry through the same current loop, and the sensor detects changes in charging current through the insulation ground connection.Filed by BBA Canada Limited, granted 1997-07-29 — one of the earliest records in scope combining non-intrusive current sensing with a remote monitoring loop for high-voltage insulation.
Highest-cited records in scope
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7747356B2 | Integrated protection, monitoring, and control system | 258 |
| 2 | US20110014501A1 | Fail safe serviceable high voltage battery pack | 216 |
| 3 | US6909942B2 | Method for power distribution system components identification, characterization and rating | 182 |
| 4 | US6141192A | Arcing fault protection system for a switchgear enclosure | 177 |
| 5 | US6525504B1 | Method and device for controlling the magnetic flux in a rotating high voltage electric alternating current m… | 137 |
| 6 | US20150002977A1 | Mechatronic Circuit Breaker Device And Associated Tripping Method And Use Thereof In Interrupting A High Dire… | 124 |
| 7 | US5933308A | Arcing fault protection system for a switchgear enclosure | 121 |
| 8 | US6777627B1 | Remote control and racking device for medium-voltage circuit breakers | 102 |
| 9 | US6892115B2 | Method and apparatus for optimized centralized critical control architecture for switchgear and power equipme… | 101 |
| 10 | US6888086B2 | Solid dielectric encapsulated interrupter | 90 |
Citation counts reflect influence within the searched corpus and skew toward older filings — treat them as a signal of impact, not of current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on High-Voltage Equipment Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the data means for filing strategy
The composition and trend numbers point to a field where core switching and protection claims are heavily filed, while the growth is coming from where sensing and control electronics attach to that hardware.
Concentration
31.6% of 1,422 records
top 5 combined share
Leadership is real but not exclusive
The five most active filers hold 31.6% of all records in scope, rising to 41.6% across the top ten. That leaves a majority of filings spread across a long tail of single- and few-filing entrants, which is where freedom-to-operate work typically finds the most movement.
Based on the 100-company ranked list returned by the data endpoint.
Technology mix
26.1% H01H
switches & relays share
Switching and grid-power claims anchor the field
H01H switches & relays and H02J power supply & grid systems are the two largest IPC subclasses, each covering roughly a quarter of the 1,422 records. Measurement (G01R) and protective circuits (H02H) sit close behind at 16.8% each, showing that sensing and protection claims are consistently bundled alongside switching hardware.
Shares sum above 100% because records carry multiple IPC codes.
Momentum
-50% (2021→2024)
three-year filing change
Volume has come down from its 2017 peak
Filings fell from 36 in 2021 to 18 in 2024, a 50% decline over that span, continuing a longer retreat from the 2017 peak of 62. The 2025 and 2026 figures are too fresh to read as a trend given the roughly 18-month publication lag.
2024 is the most recent year treated as complete for growth comparisons.
Citation signal
258 citations
top-cited record
Influence skews toward older protection and monitoring art
The most-cited record in scope, on integrated protection, monitoring and control, carries 258 citations — well ahead of the next-ranked filings on battery pack safety and arc-fault protection. High citation counts here reflect age and foundational status within the corpus rather than current commercial weight.
Citation counts favour older records in any searched corpus.
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Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to high-voltage equipment patent landscape, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on High-Voltage Equipment Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Who's Filing
The assignee landscape
A ranked field of 100 companies covers the 1,422 records in scope. Filing is led by a handful of established equipment makers, with a long tail of single-digit filers behind them — a pattern that rewards checking the tail as closely as the leaders when scoping freedom-to-operate.
Leader
202 records
leading assignee volume
One filer sits well ahead of the field
The top-ranked assignee holds 202 records, more than four times the fifth-place total of 44. That gap suggests a company that has built a broad portfolio across switchgear, protection and sensing rather than concentrating on a single sub-branch.
Counted at the patent-family level across the ranked list.
Mid-field
44 records
fifth-place volume
A cluster forms behind the leader
Fifth place sits at 44 records and tenth place at 24 — a steep but gradual drop-off rather than a cliff. That shape points to several established electrical-equipment makers filing steadily rather than one or two firms racing ahead.
Top 10 combined reach 41.6% of the 1,422 records in scope.
Recent activity
1 filing
latest-year filing by a top assignee
Momentum has thinned even among leaders
Several previously active assignees show zero filings in the latest tracked year, and one shows a -100% year-on-year change. Given the publication lag, this understates true recent activity, but it still signals that few leaders are visibly accelerating right now.
Momentum figures reflect the most recent tracked year, which is still incomplete.
Recent-year filing momentum
| Assignee | Recent year | YoY |
|---|---|---|
| Eaton Intelligent Power Limited | 1 | — |
| Solar Technology Limited | 0 | — |
| General Electric Company | 0 | — |
| Schneider Electric Industries SAS | 0 | -100% |
| Tavrida Electric Holding | 0 | — |
| Shimadzu Corporation | 0 | — |
| Toshiba Corporation | 0 | — |
| ABB Research Ltd | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on High-Voltage Equipment Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The numbers above show where claim density sits today. Turning that into a filing or freedom-to-operate decision means going deeper on specific branches and specific blocking claims.
Map the under-claimed branches
Thermal management and digital fault-arc detection show thinner filing density than the core switching classes. Running a targeted search across those branches inside Eureka surfaces the exact prior art density before drafting new claims.
Explore white space in EurekaCheck blocking claims before filing
The most-cited records in this field, including the integrated protection and monitoring patent, define claim boundaries that any new control or sensing filing has to work around. A claim-chart pass against those records is worth doing early.
Run a claim comparison in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on High-Voltage Equipment Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on high-voltage equipment patents
One assignee leads the ranked field with 202 records, well ahead of the fifth-place holder at 44. The top five combined hold 31.6% of all 1,422 records in scope, and the top ten hold 41.6%, so while there is a clear leader, the majority of filings are spread across a long tail of smaller and single-filing entrants. Checking that tail matters as much as watching the leader when assessing competitive risk in a specific sub-branch.
Filing peaked in 2017 at 62 records and has declined since, falling from 36 in 2021 to 18 in 2024 — a 50% drop over that three-year span. The 2025 and 2026 figures look lower still, but publication typically lags filing by around 18 months, so those most recent years are understated and should not be read as continued decline yet. The safest read is that filing activity has cooled meaningfully from its 2017 peak through 2024.
Switches and relays (IPC class H01H) and power supply and grid systems (H02J) are the two largest categories, each covering roughly a quarter of the 1,422 records in scope. Measurement circuits (G01R) and protective circuit arrangements (H02H) follow closely at 16.8% each, and photovoltaic integration (H02S) and semiconductor devices (H01L) make up smaller but still substantial shares. Because many filings carry multiple IPC codes, these categories overlap rather than partition the field, which reflects how often switching, sensing and protection claims are bundled together.
US5652521A claims an insulation monitoring system that uses a non-ferrous current sensor to continuously measure charging current in step-graded foil, paper and capacitive insulation systems on high-voltage apparatus such as instrument transformers and condenser bushings. Its core mechanism modulates a DC signal in a current control loop so the same loop carries both the monitoring signal and remote power to the sensor. Anyone building continuous, non-intrusive insulation monitoring on similar apparatus should check this claim scope, since it predates many later sensing approaches and was assigned to BBA Canada Limited in 1997.
Relative to the dense H01H and H02J filing classes, sub-areas such as thermal management for switchgear enclosures, non-intrusive current-loop sensing, and protective circuits integrated with photovoltaic systems show thinner claim density in this dataset. That does not mean those areas are unclaimed outright, but the concentration of filings sits elsewhere, in core switching and grid-power hardware. A targeted prior-art search on these narrower branches is the practical next step before drafting new claims there.
Answers are grounded in the same dataset. Derived from a Patsnap search on High-Voltage Equipment Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company's registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.