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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
1Prepared By S ARUN M.Tech Impulse voltage measurements
GENERAL POTENTIAL DIVIDERS
• Z1 Z2 either resistor or
capacitor . It can also be a
combination of both.
• Different errors in
measurements
1. Residual inductance
2. Stray capacitance
3. Impedance errors
4. Parasitic oscillations due
to lead and cable
inductance and
capacitance for hv
terminal to ground
2Prepared By S ARUN M.Tech Impulse voltage measurements
Resistance potential dividers for
very low impulse voltage and fast rising
pulses
3Prepared By S ARUN M.Tech Impulse voltage measurements
Potential dividers for high
voltage Impulse Measurements
4Prepared By S ARUN M.Tech Impulse voltage measurements
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
5Prepared By S ARUN M.Tech Impulse voltage measurements
Capacitance voltage divider
with distributed network
6Prepared By S ARUN M.Tech Impulse voltage measurements
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
7Prepared By S ARUN M.Tech Impulse voltage measurements
Mixed R-C potential Dividers
• RC is connected parallel
or series
• 2MV and above
• Upto 5MV
• L-Peaking
8Prepared By S ARUN M.Tech Impulse voltage measurements
Peak Reading Voltmeter for
impulse voltages
9Prepared By S ARUN M.Tech Impulse voltage measurements
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
10Prepared By S ARUN M.Tech Impulse voltage measurements
• Conclusion
From 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, 5th
edition.
11Prepared By S ARUN M.Tech Impulse voltage measurements

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Impulse voltage

  • 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 1Prepared By S ARUN M.Tech Impulse voltage measurements
  • 2. GENERAL POTENTIAL DIVIDERS • Z1 Z2 either resistor or capacitor . It can also be a combination of both. • Different errors in measurements 1. Residual inductance 2. Stray capacitance 3. Impedance errors 4. Parasitic oscillations due to lead and cable inductance and capacitance for hv terminal to ground 2Prepared By S ARUN M.Tech Impulse voltage measurements
  • 3. Resistance potential dividers for very low impulse voltage and fast rising pulses 3Prepared By S ARUN M.Tech Impulse voltage measurements
  • 4. Potential dividers for high voltage Impulse Measurements 4Prepared 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 5Prepared By S ARUN M.Tech Impulse voltage measurements
  • 6. Capacitance voltage divider with distributed network 6Prepared 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 7Prepared 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 8Prepared By S ARUN M.Tech Impulse voltage measurements
  • 9. Peak Reading Voltmeter for impulse voltages 9Prepared 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 10Prepared By S ARUN M.Tech Impulse voltage measurements
  • 11. • Conclusion From 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, 5th edition. 11Prepared By S ARUN M.Tech Impulse voltage measurements