Newtons4th Ltd D000491 PPA Phase Conventions Owner’s Manual

Newtons4th Ltd D000491 PPA Phase Conventions

Product Information

The PPA (Power Analyzer) is a measurement device manufactured by Newtons4th Ltd. It is designed to display and analyze power-related  measurements. The PPA offers various features and options, including phase conventions, signs, and orientation. The measurement displayed on the PPA remains the same regardless of the selected option. However, the way it is presented to the user may change based on the selected convention. The option to select the convention can be found in the SYS menu available on all PPA ranges. It is labeled as “Phase convention”. Additionally, in the Power Analyzer menu, there are parameters to choose between negative leading and lagging for both the power factor sign and the VAr sign. The PPA Phase Conventions table below demonstrates how the same sinusoidal signal is represented in each of the quadrants for different convention options:

Note that in POWER mode, the phase of the impedance is opposite to the phase of the current. This is because the impedance is defined as voltage/current, which results in:Zphase = – Aphase Where Zphase is the phase of the impedance and Aphase is the phase of the current.

Product Usage Instructions

To select the phase convention on the PPA, follow these steps:

1. Access the SYS menu on the PPA.
2. Locate the option labeled “Phase convention”.
3. Select the desired convention from the available options.

For specific power factor sign and VAr sign configurations, navigate to the Power Analyzer menu and choose between negativeleading and lagging options. Refer to the PPA Phase Conventions table to understand how the selected convention affects the representation of the sinusoidal signal in each quadrant.

Orientation

Phase Conventions, Signs, and Orientation

• Measurements of phase can be expressed in one of three conventional formats:
  • 180° to + 180° (commonly used in circuit analysis)
  • 0° to – 360° (The default setting, commonly used in power applications)
  • 0° to + 360°
• The measurement displayed on the PPA is the same whichever option has been selected, it is only the way that it is presenter to the user that changes.
• The option to select the convention is found in the SYS menu on all the PPA ranges, labelled as Phase convention. Additionally, in the Power Analyzer menu, there are parameters to choose between negative leading and lagging for both the power factor sign and the VAr sign.
• In the table below the same sinusoidal signal is applied and the phase convention switched between the three options, the resultant display is depicted from left to right in each row.
• Note that the phase of the impedance is the opposite to the phase of the current in POWER mode. This is because the impedance is defined as voltage/current which, considering the magnitude and phase of Z (impedance), V (voltage) and A (current), gives:
  • Zmagnitude = Vmagnitude / Amagnitude
  • Zphase = Vphase – Aphase

As the phase is referred to the voltage:

• * Zphase = – Aphase

• Therefore, using the phase convention from -180° to +180°, an inductive load which has an impedance with positive phase would cause a current with negative phase.
• The table shows for the three convention options how the same sinusoidal signal is represented in each of the quadrants. This is displayed in columns two, three and four.
• The fifth column shows the polarity of the resistance when the PPA is set in Impedance mode compared to Power Analysis mode. In each convention 0° is taken to be at the 3 O’clock position.

DIMENSION

CONTACT

• Newtons4th Ltd
• office@newtons4th.com.
• www.newtons4th.com.
• PPA Phase Conventions D000491 Issue 1
• Newtons4th Ltd 1 Bede Island Road Leicester
• LE2 7EA UK
• Tel +44 (0)116 2301066

References

• Newtons4th Power Analyzers and Frequency Analyzers Newtons 4th | Power Analyzers and Frequency Analyzers

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