Moving Coil Instrument Working Principle A moving coil meter is a very commonly used form of an analog instrument because of its sensitivity, accuracy, and linear scale, although it only responds to d.c. signals. The simple view of the construction of the moving coil instrument is shown in the figure. It consists of a powerful […]
The moving iron instruments or MI instruments are quite cheap in cost, simple in construction and very accurate at fixed power supply frequency. These instruments can be used on AC as well as DC. Therefore, these are widely used in laboratories and on switching panels. These instruments are used either as ammeters or voltmeters only.
Repulsion & Attraction Type Moving Iron Instruments Read More »
In order to ensure proper operation of indicating instruments, the following three torques are required: Deflecting Torque | Controlling Torque | Damping Torque One important requirement in indicating instruments is the arrangement for producing operating or deflecting torque (Td) when the instrument is connected in the circuit to measure the given electrical quantity. This is achieved
Deflecting Torque | Controlling Torque | Damping Torque Read More »
The no load test and the blocked rotor test are two main induction motor tests, which are performed on induction motor to know the different losses, power factor and efficiency of the induction motor. No Load Test of Induction Motor The no load test of 3 phase induction motor is performed on induction motor when