CT & PT Transformers
CTs are used to measure high current levels, while PTs are used to measure high voltage levels, converting them to lower, standardized values suitable for metering and protection devices.
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CT & PT Transformers
TMR Transformers provides high-precision Current Transformers (CTs) and Potential Transformers (PTs) designed for accurate measurement and protection in power systems. CTs are used to measure high current levels, while PTs are used to measure high voltage levels, converting them to lower, standardized values suitable for metering and protection devices.
Key features & specifications
- Secondary Current Rating: Typically 1 A or 5 A
- Accuracy Class: 0.2, 0.5, 1.0, and protection classes
- Frequency: 50Hz / 60Hz
- Insulation: Oil-immersed or epoxy resin cast
- Potential Transformers (PTs): Primary Voltage Rating: Up to 220 kV
- Secondary Voltage Rating: Typically 100 V or 110 V
- Accuracy Class: 0.2, 0.5, 1.0
- Insulation: Oil-immersed or epoxy resin cast
- High accuracy for precise measurement and reliable protection.
- Robust construction to withstand harsh environmental conditions.
- Insulation options to suit various applications and installation environments.
- Customizable designs to meet specific customer requirements.
FAQs
Frequently asked questions
- What is a CT PT transformer?
- CT and PT are instrument transformers. A current transformer (CT) steps high current down to a standard low value such as 1 A or 5 A, and a potential (voltage) transformer (PT) steps high voltage down to a standard low value such as 110 V, so meters and protection relays can measure them safely.
- What is the difference between a CT and a PT?
- A CT measures current and is connected in series with the line, with its secondary reflecting the primary current; it should never be open-circuited while energised. A PT measures voltage and is connected in parallel across the line and must not be short-circuited. Both scale high values down to safe, standardised outputs.
- What are CT and PT transformers used for?
- They are used for metering and protection in power systems — feeding energy meters, ammeters, voltmeters and protective relays with accurate, isolated, low-level signals that represent the high currents and voltages on the primary side.
- What accuracy classes and ratings does TMR offer?
- TMR manufactures CTs and PTs with accuracy classes such as 0.2, 0.5 and 1.0 plus protection classes, secondary current ratings of 1 A or 5 A and PT secondaries of 100 V or 110 V, with oil-immersed or epoxy-resin-cast insulation and custom ratios to suit metering or protection duty.
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