Ammeter Shunt | Construction & Calculation

Ammeter Shunt is used for the measurement of heavy current using an Ammeter. Ammeter Shunt is basically a low resistance connected in parallel with the moving coil so that most of the current is bypassed by the Shunt and hence only a small current flows through the moving coil. Why do we need Ammeter Shunt … Read more

Islanding Operation in Electrical Grid

Frequency and Voltage are two important parameters which decide the healthiness of the electrical grid at a particular instant of time. Frequency fluctuations occur in the electrical grid when there is a mismatch between the amount of power generation and amount of power demand. Both under frequency and over frequency operation is harmful to the … Read more

Telemetry Systems

In modern measurement systems, the various components comprising the system are usually located at the distance from each other. It is, therefore, becomes necessary to transmit the data and information between them through some form of communication channel. Telemetry may be defined as measurement at a distance. Telemetry is indicating, recording, integrating a quantity at … Read more

Advantages of Instrument Transformers

Voltmeters and Ammeters are used to measure the voltage and current in the circuits. Using instrument transformers, ranges of these devices to measure can be increased. A current transformer is basically a step-down transformer; hence it steps down the current. When used in conjunction with the low range ammeter, a current transformer (CT) increases the range … Read more

Moving Coil Instruments Advantages & Disadvantages

The operation of moving coil meters depends on the electromagnetic effect of the current (a force is exerted on the current carrying conductor when placed in a magnetic field). Moving coil instruments are of two types Permanent magnet type Dynamometer type Permanent magnet type moving coil instruments can be used only in dc circuits whereas … Read more