There are several types of sensors that can be used for measuring electric current, each with their own unique properties and applications. Some common types of current measuring sensors include:
- Hall Effect Sensors: These sensors use the principle of the Hall effect to measure the magnetic field produced by the current flowing through a conductor. Hall effect sensors can be used to measure both AC and DC currents.
- Current Transformers (CTs): CTs are electromagnetic devices that can be used to measure high currents. They consist of a primary winding and a secondary winding, and the current flowing through the primary winding induces a proportional current in the secondary winding. CTs are commonly used in power systems to measure current in high-voltage applications.
- Rogowski Coils: Rogowski coils are similar to CTs but are more flexible and easier to install. They are also more accurate at measuring rapidly changing waveforms.
- Shunt Resistor: A shunt resistor is a precision resistor that is placed in series with a circuit to measure the current flowing through it. The voltage drop across the resistor can be measured and used to calculate the current using Ohm’s Law.
- Open-Loop Sensors: These sensors measure the magnetic field produced by the current flowing through a conductor, similar to Hall effect sensors, but without a feedback loop to adjust for temperature or other factors. Open-loop sensors are typically less expensive than closed-loop sensors, but may be less accurate.
The choice of sensor will depend on the specific application requirements, such as the type and range of current to be measured, accuracy requirements, and environmental conditions.
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