https://www.esquareautomation.com/
E Square Automation - Manufacturer of Control Panels & Rogowski Coils from Pune
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https://acrelelectric.en.made-in-china.com/product/afxpRZOcTnrm/China-Br-90-3PCS-Rogowski-Coils-1000A.html
Br-90 3PCS Rogowski Coils 1000A - Br-90 and Rogowski Coils
Br-90 3PCS Rogowski Coils 1000A, Find Details and Price about Br-90 Rogowski Coils from Br-90 3PCS Rogowski Coils 1000A - ACREL CO., LTD.
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https://cpes.vt.edu/library/viewnugget/762
Phase Current Sensor and Short Circuit Protection Based on PCB-Embedded Rogowski Coils Integrated...
This Nugget from Slavko Mocevic provides a brief look into their respective research.