CT (Ratio, Polarity & Knee-Point) Testing

CT (Current Transformer) Testing evaluates critical parameters like ratio accuracy, polarity, and knee-point voltage to ensure precise measurement and protection in electrical systems. This testing guarantees CT reliability for metering and protective relays in substations, industrial plants, and utility networks.

Ratio Accuracy Testing

Verifies the CT’s transformation ratio for accurate current measurement.

Polarity Verification

Ensures correct phase alignment to avoid relay malfunctions and protection errors.

Knee-Point Voltage Testing

Determines the voltage at which the CT core saturates, critical for protection accuracy.

Compliance and Detailed Reporting

Conducts tests per IEC standards with comprehensive reports and maintenance recommendations.

End-to-End CT Testing Process

Comprehensive Testing for Current Transformer Accuracy

Preparation and Isolation

Safely isolate the CT from the system and set up test connections.

Step 01

Ratio and Polarity Measurement

Use specialized instruments to verify CT ratio and correct polarity.

Step 02

Knee-Point Voltage Test

Apply increasing voltage to determine the CT’s knee-point accurately.

Step 03

Data Analysis and Reporting

Analyze results for compliance and generate detailed test documentation with corrective actions.

Step 04

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