Resistance potential divider

RESISTANCE POTENTIAL DIVIDER IS A METHOD TO MEASURE HIGH DC VOLTAGE.

1. RESISTANCE POTENTIAL DIVIDER HIGH VOLTAGE AND CURRENT MEASUREMENT Presented by, SIRSHAK MAHAPATRA Reg.no.-120101eer001 1/11/2016 1 cutm,paralakhemundi

2. MEASUREMENT OF HIGH AC VOLTAGES Series impedance voltmeter Potential Transformers (CVT) Electrostatic Voltmeters Potential Dividers Sphere gaps 1/11/2016 2 cutm,paralakhemund i

3. MEASUREMENT OF HIGH DC VOLTAGES Series Resistance micro ammeter Resistance potential divider Generating Voltmeters Sphere Gaps 1/11/2016 3 cutm,paralakhemundi

4. Resistance potential divider Need To avoid high loading of R, Another resistor is added. When high precision is needed. Simplicity of construction Less space requirements. Less weight and easy portability. 1/11/2016 4 cutm,paralakhemundi

5. Resistance potential divider Circuit diagram 1/11/2016 5 cutm,paralakhemundi

6. Construction R1 R2 connected in series Sudden change in volt., such as switching operation, flashover of the test objects, source short circuits, damage may occur to the divider element due to stray capacitance and ground capacitance across the elements. These are can be avoided by volt. Controlling capacitors across the elements. Due to volt. Divider arrangement the influence of temp. and voltage can be eliminated. Corona free termination is done to avoid unnecessary discharges at high voltage ends. At 100kv accuracy is up to-0.05%, and in 300kv, 500kv accuracy is 0.1%,0.5% respectively. 1/11/2016 6 cutm,paralakhemundi

7. Operation DC voltages are measured using resistance voltage divider R2 <<< R1 High DC voltage applied. Drop across R1 Measure the voltage directly across R2 But if the volt. Exceeds 1000kv,problems arises like heat due to power dissipation, leakage current, change in resistance due to temp. variation. 1/11/2016 7 cutm,paralakhemundi

8. Circuit diagram 1/11/2016 cutm,paralakhemundi 8

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