Hi friends, in this article, I am discussing the dynamometer type wattmeter working principle and related information, if you are interested in it then you at the right place. These are basically moving coil instruments. But in these instruments, the operating field is produced by the fixed coil instead of a permanent magnet. The instruments …
There is no fundamental difference in the operating principles of ammeters and voltmeters. Both are current operated devices (except electrostatic type voltmeters) i.e. deflecting torque is produced when current flows through their operating coils. In an ammeter, the deflecting torque is produced by the current to be measured or by a definite fraction of it whereas …
Hi friends, in this article, I am going to discuss about moving coil instrument working principle and other related information. You will appreciate my effort, I hope so. The simple view of construction of moving coil instrument is shown in the figure. It consists of a powerful permanent shoe magnet. A light rectangular coil …
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. …
In order to ensure proper operation of indicating instruments, the following three torques are required: Deflecting torque. Controlling torque. Damping torque. What is deflecting 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 …
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 …