Impulse voltage

generation of high impulse voltage has explained

1. Impulse voltage measurements Contents General Potential Dividers Resistance potential dividers for very low impulse voltage and fast rising pulses Potential dividers for high voltage Impulse Measurements Capacitance voltage divider Field control voltage divider Mixed R-C potential divider Peak reading voltmeter Conclusion and Reference 1 Prepared By S ARUN M.Tech Impulse voltage measurements

2. GENERAL POTENTIAL DIVIDERS Z 1 Z 2 either resistor or capacitor . It can also be a combination of both. Different errors in measurements Residual inductance Stray capacitance Impedance errors Parasitic oscillations due to lead and cable inductance and capacitance for hv terminal to ground 2 Prepared By S ARUN M.Tech Impulse voltage measurements

3. Resistance potential dividers for very low impulse voltage and fast rising pulses 3 Prepared By S ARUN M.Tech Impulse voltage measurements

4. Potential dividers for high voltage Impulse Measurements 4 Prepared By S ARUN M.Tech Impulse voltage measurements

5. Capacitive voltage dividers Pure capacitive dividers Capacitance ratio is independent of the frequency C1 is formed between h.v terminal of the source and that of test object or other point of measurement CRO located within the shielded screen surrounding capacitance C2 Loading of the source is negligible Voltage ratio of the divider will be affected 5 Prepared By S ARUN M.Tech Impulse voltage measurements

6. Capacitance voltage divider with distributed network 6 Prepared By S ARUN M.Tech Impulse voltage measurements

7. Field controlled voltage dividers Enforce a uniform field R1 – non-linear resistance Parallel resistance R2 together with lead inductance and shunt capacitance causes oscillations Loading effect is reduced Response time less Overshoot reduced by damping resistors 7 Prepared By S ARUN M.Tech Impulse voltage measurements

8. Mixed R-C potential Dividers RC is connected parallel or series 2MV and above Upto 5MV L-Peaking 8 Prepared By S ARUN M.Tech Impulse voltage measurements

9. Peak Reading Voltmeter for impulse voltages 9 Prepared By S ARUN M.Tech Impulse voltage measurements

10. Description Consists of only rectifiers Diode D conducts for positive voltage When voltage impulse appears across the low voltage arm of the potential divider, Cm charged to the peak value of the pulse High impedance voltmeter Capacitor –to prevent the build up of DC voltage 10 Prepared By S ARUN M.Tech Impulse voltage measurements

11. Conclusion F rom these conclude how to measure high impulse voltage measurement technique in high voltage engineering. Reference “ High voltage engineering ” by M S Naidu and V Kamaraju, Tata McGraw Hill Education, 5 th edition. 11 Prepared By S ARUN M.Tech Impulse voltage measurements