Thermal Principles of Thermorresistors

Thermoresistors consist of temperature sensors with operating principle based on a property that some components that can vary the electrical resistance with change of temperature. These sensors have a calibrated resistance that can vary linearly according to their temperature, allowing continuous monitoring of the motor heating process by a controller display, with a high degree of sensitivity and return accuracy. The two-wire configuration is often satisfactory in environments where the length of the sensor cable to the instrument does not exceed 3m for 20 AWG gauge.

In the configuration of three wires, the most used by industries, there is a compensation of the electrical resistance by the third wire. In the four-wire configuration, which requires a more precise assembly, there are two connections for each terminal of the bulb, two wires for voltage and two for current, thus obtaining a total balance of resistances, usually used in cases where High precision is required. This same sensor can also operate as an alarm for operations that occur above the common working temperature.

Transformers and Their Use

Transformers have an important role, but they have a high cost. In general, they are the most expensive equipment of a project, as well as their peculiarities of transportation, assembly, energization, operation and protection stages, so it is of the utmost importance that professionals Involved in any of these steps are properly trained.

Transformers are equipment used to transfer energy from one side of the circuit to the other through a magnetic flux common to both sides. With the exception of the autotransformer, where there is no electrical connection between the parts of the interconnected circuits through this equipment.

The transformer acme transformer 2017 is defined as a static equipment with two or more windings which, by electromagnetic induction converts an alternating voltage and current system into another system, generally being a different voltage and current system from the original system, maintaining the frequency.

The standard specifies that such conversion is intended for the transmission of electrical power and when operating as control equipment, its purpose is not to transform large amounts of energy, but to produce small variations of phase voltage or both.

The transformers are constructed in such a way that their conversion ratio can be induced under vacuum or even under load with the aid of motors.