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

1. RESISTANCE POTENTIAL DIVIDER
HIGH VOLTAGE AND CURRENT MEASUREMENT
Presented by,
SIRSHAK
MAHAPATRA2/15/2016
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2. MEASUREMENT OF HIGH AC VOLTAGES
1. Series impedance voltmeter
2. Potential Transformers (CVT)
3. Electrostatic Voltmeters
4. Potential Dividers
5. Sphere gaps
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3. MEASUREMENT OF HIGH DC VOLTAGES
1. Series Resistance micro ammeter
2. Resistance potential divider
3. Generating Voltmeters
4. Sphere Gaps
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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.
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5. RESISTANCE POTENTIAL DIVIDER
CIRCUIT DIAGRAM
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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.
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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.
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8. CIRCUIT DIAGRAM
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10. 2/15/2016
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