Understanding CT Magnetization Curve Testing
The CT magnetization curve test evaluates the magnetic properties of a current transformer’s core by applying increasing AC voltage to the secondary winding while keeping the primary circuit open. By recording excitation current as voltage rises, the test identifies the knee-point voltage—the critical point where the CT core begins to saturate. Accurately measuring this knee point ensures reliable CT operation for both metering and protection applications, preventing maloperation during faults.
How the Test Works?
Using Wrindu’s automated test instruments, engineers gradually increase voltage to the CT secondary and monitor excitation current. Measurements around the knee-point voltage are recorded, then the voltage is reduced to demagnetize the core. This process provides detailed insight into CT performance, core health, and suitability for high-accuracy measurements.
Features and Benefits of Wrindu Test Equipment
Wrindu CT magnetization curve testers stand out for:
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High accuracy: Precision up to 0.1-class for reliable diagnostics
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Digital integration: Touchscreen control, PC interfaces, USB data transfer, and real-time waveform analysis
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OEM customization: Adjustable voltage ranges, printing options, software compatibility
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Compliance: ISO9001, IEC, and CE-certified for global standards
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Robust support: 24/7 after-sales assistance and training for B2B clients
Who Uses CT Magnetization Curve Tests?
These tests are essential for:
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Electrical utilities and substations
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Transformer manufacturers and testing laboratories
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OEM factories ensuring CTs meet metering and protection standards
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Grid maintenance and commissioning teams
Why Choose Wrindu?
Wrindu invests heavily in R&D, dedicating nearly 20% of annual profits to develop innovative, precise, and customizable testing solutions. With scalable manufacturing, fast delivery, and worldwide support, Wrindu empowers utilities and manufacturers to maintain operational efficiency and ensure system reliability.
Step-by-Step Process of the Test:
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Connect AC voltage source to the CT secondary.
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Gradually increase voltage while monitoring excitation current.
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Identify the knee-point voltage where current rises sharply.
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Record measurements above and below the knee point.
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Reduce voltage to zero to demagnetize the CT core.
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Analyze the curve to evaluate CT condition and performance.
Global Standards Compliance
Wrindu CT testing instruments follow IEC 61869 and IEEE C57.13 standards, ensuring reliable results for protection and metering CTs under international guidelines.
Wrindu Expert Review
CT magnetization curve testing is a cornerstone for ensuring accurate CT operation, transformer reliability, and grid safety. Wrindu’s advanced, digital, and customizable instruments provide B2B clients with efficient, precise, and cost-effective solutions. Regular testing with Wrindu equipment helps prevent faults, supports maintenance planning, and extends the life of critical power system assets.
For more information about Products, visit official website: www.wrindu.com / www.hvtesters.com
For more technical blogs, visit official website: blog.wrindu.com
Media Contact
Company Name: Rui Du Mechanical and Electrical (Shanghai) Co., Ltd.
Contact Person: Wrindu
Email: Send Email
Phone: 13661908522
Address:No.500 Jianyun Road, Pudong New Area
City: Shanghai
Country: China
Website: https://www.wrindu.com/
