Week 16
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The document discusses high voltage measurement techniques including using a voltage divider rule to measure high voltages. It explains that for direct current, electric lines of force are static but for alternating current, charge density is a periodic function of time. It also covers energy storage in capacitors using the equation that energy density equals one half the permittivity of free space multiplied by the electric field strength squared. Safety clearances for high voltage equipment are discussed including the air gap and spark point height above ground or other objects.
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![Voltage divider rule
V2= HV [R2/ (R1+R2)]](https://image.slidesharecdn.com/week-16-210928094639/85/Week-16-3-320.jpg)
Week 16
- 2. Ohmic that obeys ohm’s law
- 3. Voltage divider rule V2= HV [R2/ (R1+R2)]
- 4. For DC Electric lines of force By induction process For HVAC, the sigma (charge density) is function of time but for HVDC, sigma is function of charge
- 5. Periodic function After applying derivative Product rule of derivative
- 6. i=C dVc/dt Freq of sync motor
- 10. Energy storage in capacitor or simply work done in raising the potential of capacitor to V volts As, C= Ɛ A/d So, W= 1/2 (ƐA/d) V2 = 1/2 (Ɛ A/d) (E.d)2 =1/2 Ɛ Ad E2 = 1/2 V Ɛ E2 Energy Density W/V = 1/2 Ɛ E2
- 13. Air Gap known distance Apply Voltage here to be measure
- 17. A = height of Spark point from ground B = clearance from the nearest body/object