High Direct Current Measurement Methods - High Voltage Engineering

TL;DR

Different methods like resistive shunt, Hall effect generator, and magnetic link are used to measure DC, AC, and impulse currents for power system equipment testing.

Transcript

hello friends we are discussing methods of measurement of high current from this lecture we'll be covering the topic measurement of high current there are different currents classified as dc current ac current and impulse current these currents are to be measured for the purpose of some applications let us start with this methods of measurement of ... Read More

Key Insights

• ✋ Different high current measurement methods include resistive shunt, Hall effect generator, and magnetic link for DC, AC, and impulse currents.
• ✋ High current measurement is crucial for testing equipment withstandability during short circuits and other high current events.
• 😘 Resistive shunt with millivolt meter provides precise high current measurements with low resistance.
• 😒 Hall effect generator uses the Hall effect principle to measure high DC currents accurately.
• 🙊 Magnetic link is used for measuring impulse currents and peak magnitudes.
• 🙊 Magnetic links retain information about peak current values after current flow, aiding in measuring impulse currents.
• ✋ High current measurement methods vary in complexity and application suitability.

Questions & Answers

Q: Why is it essential to measure high currents in power systems?

High current measurement is crucial in power systems to test the withstandability of equipment during short circuits, lightning discharges, and switching transients, ensuring equipment safety and reliability.

Q: What are the methods used for measuring high DC currents?

Methods for high DC current measurement include resistive shunt with millivolt meter, Hall effect generator utilizing the Hall effect principle, and magnetic link for peak current magnitudes.

Q: How does a resistive shunt with millivolt meter work for measuring high currents?

A resistive shunt connected to a millivolt meter measures the voltage drop across a low resistance, providing a precise measurement of high DC currents with limited voltage drops.

Q: What advantages does a Hall effect generator offer for high current measurements?

The Hall effect generator uses the Hall effect principle to measure high DC currents accurately and is suitable for applications where direct current measurement is required.

Summary & Key Takeaways

• Various methods like resistive shunt, Hall effect generator, and magnetic link are used for measuring high DC, AC, and impulse currents.

• The necessity for measuring high currents arises from short circuits, lightning discharges, and switching transients that impact power system equipment.

• Each method, whether resistive shunt, Hall effect generator, or magnetic link, has its advantages and limitations for measuring high currents.