Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

What is a Strain GaugeA strain gauge is a resistor used to measure strain on an object. When an external force is applied on an object, due to which there is a deformation occurs in the shape of the object. This deformation in the shape is both compressive or tensile is called strain, and it is measured by the strain gauge. When an object deforms within the limit of elasticity, either it becomes narrower and longer or it become shorter and broadens. As a result of it, there is a change in resist

What is an Oscillator TransducerAn oscillator transducer is a type of transducer that can be used to measure force, pressure, or displacement by converting it a voltage, which can then be measured by a voltmeter. Oscillator transducer are mostly used as secondary transducers, with their output calibrated in terms of their input quantity. Oscillatory transducer consists of following parts Mechanical linkage Oscillator Frequency modulator Force summing memberMechanical linkage: This is used to lin

Inductive transducers work on the principle of inductance change due to any appreciable change in the quantity to be measured i.e. measured. For example, LVDT, a kind of inductive transducers, measures displacement in terms of voltage difference between its two secondary voltages. Secondary voltages are nothing but the result of induction due to the flux change in the secondary coil with the displacement of the iron bar. Anyway, LVDT is discussed here briefly to explain the principle of inductiv

What is a Temperature Transducer?A Temperature Transducer is a device that converts the thermal quantity into any physical quantity such as mechanical energy, pressure and electrical signals etc. For example, in a thermocouple the electrical potential difference is produced due to temperature difference across its terminals. So, thermocouple is an temperature transducer.Main Features of Temperature Transducers The input to them are always the thermal quantities They generally converts the therma

Definition of LVDTThe term LVDT stands for the Linear Variable Differential Transformer. It is the most widely used inductive transducer that converts the linear motion into the electrical signal.The output across secondary of this transformer is the differential thus it is called so. It is very accurate inductive transducer as compared to other inductive transducers.Construction of LVDTMain Features of Construction The transformer consists of a primary winding P and two secondary windings S1and

What is Piezoelectric TransducerA piezoelectric transducer (also known as a piezoelectric sensor) is a device that uses the piezoelectric effect to measure changes in acceleration, pressure, strain, temperature or force by converting this energy into an electrical charge.A transducer can be anything that converts one form of energy to another. The piezoelectric material is one kind of transducers. When we squeeze this piezoelectric material or apply any force or pressure, the transducer converts

Principle of Tan Delta TestA pure insulator when is connected across line and earth, it behaves as a capacitor. In an ideal insulator, as the insulating material which acts as dielectric too, is 100 % pure, the electric current passing through the insulator, only have capacitive component. There is no resistive component of the current, flowing from line to earth through insulator as in ideal insulating material, there is zero percent impurity.In a pure capacitor, the capacitive electric current

Polarization Index Test (PI Value Test) along with Insulation Resistance Test (IR Value Test) is conducted on HV electrical machine to determine service condition of the insulation. IP test is conducted especially to determine the dryness and cleanliness of the insulation.In insulation resistance test, a high DC voltage is applied across the insulator. This applied voltage is then divided by current through the electrical insulator to obtain resistive value of the insulator. Since, as per Ohm’s

What is a Transducer?An electrical transducer is a device which is capable of converting physical quanties into a proportional electrical quantity such as voltage or electric current. Hence it converts any quantity to be measured into a usable electrical signal. This physical quantity which is to be measured can be pressure, level, temperature, displacement etc. The output which is obtained from the transducer is in the electrical form and is equivalent to the measured quantity. For example, a t

A potentiometer is an instrument which measures unknown voltage by balancing it with a known voltage. The known source may be DC or AC. The working phenomenon of DC potentiometer and AC potentiometer is same. But there is one major difference between their measurements, DC potentiometer only measures the magnitude of the unknown voltage. Whereas an AC potentiometer measures both the magnitude and phase of unknown voltage by comparing it with a known reference. There are two types of AC potentiom