# Voltage Regulation - PowerPoint PPT Presentation

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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)
• 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
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
• Determine

7
• 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
• 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