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Voltage Regulation

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Voltage Regulation ECE 441 * ECE 441 * Voltage Regulation (continued) Enl = no-load output voltage Measure with a voltmeter when no load is connected to the ... – PowerPoint PPT presentation

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Title: Voltage Regulation


1
Voltage Regulation
2
Voltage Regulation (continued)
  • Enl no-load output voltage
  • Measure with a voltmeter when no load is
    connected to the transformer
  • Vrated voltmeter reading at the output
    terminals when the transformer is
    supplying the rated apparent power
  • These voltages are all either High-side or
    Low-side voltages!

3
Voltage Regulation (continued)
  • Measurements are not always easy to make, so use
    the equivalent circuit.

4
When the breaker is open, no current flows in
Req,LS , jXeq,LS , or ZLOAD,LS , therefore Vout
VLS ELS Enl
5
With rated load on the secondary, ELS
ILSZeq,LS VLS ILS rated low-side current at a
specified power factor VLS rated low-side
voltage Zeq,LS equivalent impedance of the
transformer referred to the low-side
ELS no-load low-side voltage
6
Example 2.7
  • The equivalent low-side parameters of a 250kVA,
    4160 480V, 60 Hz transformer areReq,LS
    0.00920 O and Xeq,LS 0.0433 O. The transformer
    is operated in the step-down mode and is
    delivering rated current at rated voltage to a
    0.840 power-factor lagging load.
  • Determine

7
  • the no-load voltage
  • The actual input voltage on the high-side
  • The high-side current
  • The input impedance
  • The voltage regulation
  • The voltage regulation if the power factor of the
    load is 0.840 leading
  • Sketch the tip-to-tail phasor diagram of the
    secondary circuit for the 0.840 power factor
    lagging load. Show all voltage drops.

8
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9
Low-Side Output
10
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11
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12
The high-side current
The input impedance
13
The voltage regulation
14
Voltage Regulation if the power factor is 0.840
leading
Regulation is negative because of a voltage rise
in the transformer due to resonant effects.
15
The tip-to-tail phasor diagram for the 0.840
power factor lagging load.
16
Component Phasors
17
Tip-to-Tail Addition
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