Extension of Instrument Ranges topics include: Shunts and multipliers, instrument transformers and its advantages, current transformers errors and design features, C.T. and P.T. differences, potential transformers error reduction and characteristics, advanced problems on indicating instruments, C.T and P.T. Extending the range of an instrument is a concept that measures higher current or voltage values than the instrument's rating. It's done by adding external resistance or impedance in series or parallel. Here are some ways to extend the range of instruments: Ammeter: To increase the... Show more Extension of Instrument Ranges topics include: Shunts and multipliers, instrument transformers and its advantages, current transformers errors and design features, C.T. and P.T. differences, potential transformers error reduction and characteristics, advanced problems on indicating instruments, C.T and P.T. Extending the range of an instrument is a concept that measures higher current or voltage values than the instrument's rating. It's done by adding external resistance or impedance in series or parallel. Here are some ways to extend the range of instruments: Ammeter: To increase the range of an ammeter, you can connect a small shunt resistance in parallel with it. This decreases the effective resistance and increases the current flow through the ammeter. Voltmeter: To increase the range of a voltmeter, you can connect a high series of multiplier resistance in series with it. The multiplier is a non-inductive high-value resistance that limits the voltage drop so that it does not exceed the value of full scale. This prevents the voltmeter from being damaged. Current transformers (CTs) and potential transformers (PTs) are both measuring devices that use magnetic circuitry to measure power supply. The main difference between the two is that CTs reduce high electrical currents to a lower value, while PTs reduce high voltage to a lower voltage. Show less
Extension of Instrument Ranges topics include: Shunts and multipliers, instrument transformers and its advantages, current transformers errors and design features, C.T. and P.T. differences, potential transformers error reduction and characteristics, advanced problems on indicating instruments, C.T and P.T.
Extending the range of an instrument is a concept that measures higher current or voltage values than the instrument's rating. It's done by adding external resistance or impedance in series or parallel.
Here are some ways to extend the range of instruments: Ammeter: To increase the range of an ammeter, you can connect a small shunt resistance in parallel with it. This decreases the effective resistance and increases the current flow through the ammeter. Voltmeter: To increase the range of a voltmeter, you can connect a high series of multiplier resistance in series with it. The multiplier is a non-inductive high-value resistance that limits the voltage drop so that it does not exceed the value of full scale. This prevents the voltmeter from being damaged.
Current transformers (CTs) and potential transformers (PTs) are both measuring devices that use magnetic circuitry to measure power supply. The main difference between the two is that CTs reduce high electrical currents to a lower value, while PTs reduce high voltage to a lower voltage.
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