Resources to Familiarize yourself with the implementation of Loss Compensation on the M When performing commissioning testing, it is helpful to be able to look at both the compensated and the uncompensated values of watts and VARs at the same time in order to compare those measurements with the predicted values when the volts, amps and phase angle injected into the meter are manipulated, usually with a relay test set. Configure the M, Part 2: Line losses only, segment ab. If the meter is located at c and the point of delivery is at a Figure 7 the results shown below are the settings A, B, C, and D for the M Add Line ab, Line cd, and Transformer losses.
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Since the line segment cd is on the opposite side of the transformer relative to the meter, the coefficients Acd and Ccd must take into consideration that the current passing through line segment cd is not the same as the current sensed by the meter. Case 1 Case 3 Case 5 Add Transformer losses only.
Case 4 Same as Case 2 No compensation necessary. Line losses for segment ab plus transformer losses plus line losses for segment cd.
If expressed in kW, multiply by to get units of watts. The screen will look something like Figure A2. This is illustrated in Figure 10, below. See note 4, below. Displqy reactivity of a line reactance per unit of length is generally a published characteristic of the line, but may also be measured.
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This is illustrated in Figure 11, below. If you make any changes on this page, be sure to Apply the changes and Reset the meter when prompted. This is done regardless of whether the Page6 transformer is delta or wye connected.
Same as Case 3 settings negative Case 5 settings negative Figure 3. Return to this page in the webserver interface after the completion of the test and uncheck the box next to the custom screen if you prefer not to see uncompensated watts and VARs in the display scrolling sequence during normal operation. By making diisplay settings positive, the losses will be added to the uncompensated measurements in order to produce compensated measurements.
Loss Compensation Settings on the M The sign of the settings A, B, C, D, and E determines whether losses will be added to or subtracted from the uncompensated measurements in order to determine the compensated power and energy.
Location of the Meter a Point of Delivery a b No compensation necessary. All information specifically related to Loss Compensation, including a copy of cisplay application note, a spread sheet to help calculate the meter settings and firmware v3.
If the meter is at a and the point of delivery is at displau Figure 5 then multiply the results shown below by negative one before entering as the settings A, B, C, and D on the M Results for Case 1: Enable a local display of uncompensated Watts and VARs for the purpose of testing.
There are a couple possible sources of error to watch out for, however. Since the meter is downstream from the point of delivery, all four settings must be positive in order for the losses to be added from the uncompensated power.
Calculate the settings required to configure an M650 so
You may type anything you like for the Alphanumeric Label but the space is limited to a maximum of eight characters, risplay you may need to be a little creative e. Since the meter is upstream from the point didplay delivery, all four settings must be negative in order for the losses to be subtracted from the uncompensated power.
Be sure the signs of the settings are all negative, so the losses will be subtracted from the uncompensated measurements in order to produce compensated measurements. The spread sheet may be downloaded from the public FTP Site. The meter will take a few seconds to reboot.
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Use the diagram in Figure disp,ay and the table in Figure 3 in this application note to decide how the M meter will be oriented relative to the point of delivery, observing the direction of power flow intended to display as positive on the meter. Direction of power flow. A spread sheet see Figure A1, below, file name: A meter having model number MM3P, for example, has the M3 option code and dixplay support loss compensation. Then under Loss Compensation, enter the settings you calculated.
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Line losses only, segment ab. The results given in the spread sheet are the five settings to be entered in the M configuration. This is accomplished simply by multiplying line impedance by the square of the turns ratio of the power transformer: