CT/PT Analysis

What is CT and PT test?

CT/PT analysis refers to the testing and analysis of Current Transformers (CTs) and Potential Transformers (PTs), which are essential components in power systems for measuring current and voltage, respectively. These transformers are used to step down high currents and voltages to levels that can be safely and accurately measured by instruments and protective relays.

Here's a brief overview of CT/PT analysis:

Current Transformers (CTs):

CTs are used to measure current in power systems. They provide a reduced current proportional to the actual current flowing in the conductor.

Testing and Analysis:

1. Ratio Test: This test determines the accuracy of the CT by comparing the ratio of the primary and secondary currents. It ensures that the CT accurately reflects the primary current in the secondary circuit.
   
   
2. Polarity Test: This test determines the direction of the current flow in the primary winding concerning the secondary winding. Correct polarity is crucial for the proper functioning of protective relays.
   
   
3. Saturation Test: CTs can saturate at high currents, leading to inaccurate readings. This test ensures that the CT operates within its linear range under normal operating conditions.

Potential Transformers (PTs):

PTs are used to step down high voltages to a level suitable for measurement and protection equipment.

Testing and Analysis:

1. Ratio Test:
   Similar to CTs, the ratio test for PTs ensures that the voltage transformation ratio is accurate.
   
   
2. Polarity Test:
   Like CTs, PTs also have polarity, and the correct orientation is vital for accurate measurements.
   
   
3. Dielectric Test:
   This test checks the insulation properties of the PT to ensure it can withstand the high voltages in the system without breakdown.

Composite Tests:

1. Burden Test:
   This test determines the load that the CT or PT presents to the circuit. It ensures that the burden is within specified limits.
   
   
2. Accuracy Class Test:
   CTs and PTs are assigned accuracy classes, and this test verifies whether the transformer meets the accuracy requirements for a given application.

CT/PT analysis is crucial for maintaining the accuracy and reliability of power system measurements and protective relaying. Regular testing helps identify any issues with these transformers, ensuring they operate correctly under various conditions. Properly functioning CTs and PTs are essential for the overall reliability and safety of power systems.

Contact us today to learn more and schedule your CT/PT Analysis service.

You can get any of the following:
📞 01977-426642
📧 info@iconic.com.bd
🌐 www.iconic.com.bd

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