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Topic · Electrical and Electronic Engineering

Power Transformer Diagnostics and Insulation

Power Transformer Diagnostics and Insulation is a research topic within Electrical and Electronic Engineering. Science Explorer counts 23k research works in it since 1950. 10.0% of them reached the world's top 10% most cited for their field and year.

This cluster of papers focuses on the condition assessment and diagnosis of power transformers, with an emphasis on techniques such as dissolved gas analysis, frequency response analysis, and dielectric spectroscopy. The aging of insulation materials, use of vegetable oils, and asset management strategies are also key areas of research.

  • Dissolved Gas Analysis
  • Frequency Response Analysis
  • Insulation Condition Assessment
  • Transformer Fault Diagnosis
  • Dielectric Spectroscopy
  • Aging of Insulation
  • Power Transformer Asset Management
  • Oil Impregnated Paper
  • Vegetable Oils for Transformers
  • Diagnostic Techniques
Research works
23k
fractional, since 1950
In the world top 10%
2.2k
per year above
Top-10% rate
10.0%
share of its works in the world top 10%
Growth, 2018-21 → 2022-25
+20%
the tick is no change
Largest producer
China
56% of the 10 largest, 2022-now
Power Transformer Diagnostics and Insulation

Which countries lead Power Transformer Diagnostics and Insulation research?

By volume, China and India publish the most (2k and 497 works in 2022-now).

By volume, 2022-now

  1. 1 China 2k works
  2. 2 India 497 works
  3. 3 United States 290 works
  4. 4 Indonesia 123 works
  5. 5 ?? 118 works
  6. 6 Russia 117 works
  7. 7 Iran 110 works
  8. 8 Japan 108 works
  9. 9 Germany 105 works
  10. 10 Malaysia 95 works

How concentrated that is

The same countries as shares of everything the list above accounts for. A node where two countries do two thirds of the work and one spread evenly across twelve read alike as a ranking and not at all alike here.

China: 56.5%India: 13.9%United States: 8.1%Indonesia: 3.4%6 others listed: 18.2%56%largest
China2,026 · 56.5%India497 · 13.9%United States290 · 8.1%Indonesia123 · 3.4%6 others listed653 · 18.2%

Shares of the rows listed above, not of the whole node.

Which institutions lead Power Transformer Diagnostics and Insulation research?

By volume in 2022-now, Xi'an Jiaotong University publishes the most Power Transformer Diagnostics and Insulation research, followed by State Grid Corporation of China (China) and North China Electric Power University.

By volume, 2022-now

  1. 1 Xi'an Jiaotong UniversityChina 162 works
  2. 2 State Grid Corporation of China (China)China 146 works
  3. 3 North China Electric Power UniversityChina 135 works
  4. 4 China Southern Power Grid (China)China 111 works
  5. 5 Chongqing UniversityChina 99 works
  6. 6 Shanghai Electric (China)China 72 works
  7. 7 Electric Power Research InstituteUnited States 47 works
  8. 8 Tsinghua UniversityChina 37 works
  9. 9 Wuhan UniversityChina 36 works
  10. 10 Shandong UniversityChina 35 works

Who are the leading researchers in Power Transformer Diagnostics and Insulation?

The most-cited researchers publishing on Power Transformer Diagnostics and Insulation include Kenji Watanabe, Takashi Taniguchi and Frede Blaabjerg.

  1. 1 Kenji Watanabe Japan 237k citations
  2. 2 Takashi Taniguchi Japan 227k citations
  3. 3 Frede Blaabjerg Denmark 203k citations
  4. 4 Hua Zhang Singapore 196k citations
  5. 5 Qiang Zhang China 184k citations
  6. 6 Pulickel Madhavapanicker Ajayan United States 173k citations
  7. 7 N. Berger France 144k citations

Ranked by citations received across their whole record, among researchers with at least three works on this topic.

What are the most cited papers in Power Transformer Diagnostics and Insulation?

The most cited paper in Power Transformer Diagnostics and Insulation is "Generalized Formula for the Electric Tunnel Effect between Similar Electrodes Separated by a Thin Insulating Film" (John G. Simmons, 1963), with 4,170 citations. Next come "Anomalously increased effective thermal conductivities of ethylene glycol-based nanofluids containing copper nanoparticles" (4,041) and "Condition Monitoring and Fault Diagnosis of Electrical Motors—A Review" (2,385).

Most cited papers
#PaperReleasedCitations
1 Generalized Formula for the Electric Tunnel Effect between Similar Electrodes Separated by a Thin Insulating Film John G. Simmons · Journal of Applied Physics Jun 1963 4,170
2 Anomalously increased effective thermal conductivities of ethylene glycol-based nanofluids containing copper nanoparticles Jeffrey A. Eastman, Soo-Chang Choi, Shuai Li et al. · Applied Physics Letters 5 Feb 2001 4,041
3 Condition Monitoring and Fault Diagnosis of Electrical Motors—A Review S. Nandi, Hamid A. Toliyat, Xiaodong Li · IEEE Transactions on Energy Conversion Dec 2005 2,385
4 A Review on Nanofluids: Preparation, Stability Mechanisms, and Applications Wei Yu, Huaqing Xie · Journal of Nanomaterials Open access 28 Sep 2011 1,775
5 Space-Charge-Limited Currents in Solids Albert Rose · Physical Review 15 Mar 1955 1,767
All 100 most cited papers, with filters and sorting

Where is Power Transformer Diagnostics and Insulation research done?

The largest centres of Power Transformer Diagnostics and Insulation research in 2022-now are Beijing (China), Xi'an (China), Guangzhou (China) and Chongqing (China). Among places with at least 20 works in it, it is an unusually large share of all research in Xi'an, Saguenay and Palo Alto.

Largest cities, 2022-now

  1. 1 BeijingChina 385 works
  2. 2 Xi'anChina 180 works
  3. 3 GuangzhouChina 143 works
  4. 4 ChongqingChina 138 works
  5. 5 ShanghaiChina 135 works
  6. 6 WuhanChina 95 works
  7. 7 NanjingChina 69 works
  8. 8 ChengduChina 67 works
  9. 9 HarbinChina 63 works
  10. 10 TianjinChina 54 works

Where it is the local speciality

  1. Xi'an31.5 works96×
  2. SaguenayCA · 20.1 works62×
  3. Palo AltoUS · 47.0 works28×
  4. Beijing44.8 works23×
← less than its size predicts1×more →

Location quotient: how much more of its research is in Power Transformer Diagnostics and Insulation than the world average.

See Power Transformer Diagnostics and Insulation on the map

Where is the best place to study Power Transformer Diagnostics and Insulation?

Among universities, judged by research, Université du Québec à Chicoutimi, University of Johannesburg and Xi'an Jiaotong University score highest, combining excellence, specialisation, size, growth and international reach. Research strength is one signal when choosing where to study; it does not measure teaching.

0%20%40%mean 19.01%fractional works in this field (log) →share of work in the world top 10% →Université du Québec…University of Johann…Southwest UniversityXi'an Jiaotong Unive…
above the meannear itbelow it

One dot per university in the first ten of the table below, at the default weights. The upper left is the interesting corner: small places doing unusually strong work.

Excellenceshare of its work in the world top 10%, 2022-now and all time averaged
40%
Specialisationhow much of its work is in this field, counted up to 10× the world share
10%
Sizeits output in this field, on a log scale
30%
Growthoutput growth, counted from -20% to +20%
10%
Internationalshare of its work with a co-author abroad
10%
Each slider sets a weight; the share it gets of the score is beside it.
#UniversityScoreTop 10%SpecialisationWorksGrowth
1Université du Québec à ChicoutimiCanada 75.839.7%83.2×20 +70.7%
2University of JohannesburgSouth Africa 64.032.5%5.8×16 +139.9%
3Xi'an Jiaotong UniversityChina 62.612.0%21.4×162 +5.7%
4Southwest UniversityChina 59.022.8%7.2×17 +32.8%
5Chongqing UniversityChina 57.312.2%21.0×99 -1.7%
6North China Electric Power UniversityChina 56.25.4%46.7×135 +17.8%
7Guangxi UniversityChina 56.117.8%10.0×26 +18.9%
8Northeast Electric Power UniversityChina 50.224.4%17.1×10 +93.1%
9Wuhan UniversityChina 49.911.4%5.9×36 +17.1%
10Tsinghua UniversityChina 49.111.9%3.7×37 +14.9%

Universities only. The score blends excellence (40%), size (30%), specialisation (10%), growth (10%), international reach (10%), 2022-now; growth compares 2018-21 with 2022-25 and counts up to +20%, since a jump from a small base is mostly noise.

Every institution in Power Transformer Diagnostics and Insulation, country by country

Is Power Transformer Diagnostics and Insulation research growing?

Output in 2022-2025 was 20% higher than in 2018-2021, peaking in 2025. The fastest-growing topics are Power Transformer Diagnostics and Insulation.

still counting19801990200020102020
grewheldshrank

The same series as a ribbon: one cell per year, darker for more. The line above answers how much; this answers when.

Its share of all research

Growing output can still be a shrinking share: all of science grows. This is Power Transformer Diagnostics and Insulation as a percentage of every work published that year, 0.019% in 2024.

still counting0.020%0.040%0.060%Power Transformer Diagnostics and Insulation0.021% in 202519801990200020102020

Fractional works of Power Transformer Diagnostics and Insulation over all fractional works that year. How the balance of science has shifted.

How much of it reaches the world top 10%

Year by year.

still counting5%10%15%Power Transformer Diagnostics and Insulation9.8% in 2025200020102020

Of each year's works in it, the share that reached the world's 10% most cited for their field and year. A field is the world for its own topics, so there is no other line to hold it against.

Which topics inside it are moving

Growth and decline on one axis around a shared zero. Two lists side by side hide the thing that matters: whether the growth dwarfs the decline, or the other way round.

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