What type of sensors are commonly used in motor protection systems?

Motor protection systems rely heavily on monitoring electrical parameters to ensure that a motor operates efficiently and safely. Current sensors, voltage sensors, and temperature sensors play a crucial role in this context.

Current sensors are employed to measure the electrical current flowing through the motor. This information is vital for detecting overload conditions, which, if left unmitigated, can lead to motor failure or damage. By monitoring the current, protective devices can trip the motor in case of excessive loads.

Voltage sensors monitor the electrical voltage supplied to the motor. These sensors help in identifying issues such as undervoltage or overvoltage situations, which can also cause damage to motor windings or lead to inefficient operation.

Temperature sensors are integral to ensuring that the motor does not overheat. Excessive heat can result from prolonged overload conditions or inadequate cooling, leading to insulation breakdown and short circuits. Monitoring temperature helps in implementing protective measures before damage occurs.

While the other options contain sensors that can be useful in specific applications, the combination of current, voltage, and temperature sensors is essential in providing a protective mechanism that directly addresses the typical operational risks faced by motors.