If the meter is located at d and the point of delivery is at a Figure 12 the results shown below are the settings A, B, C, and D for the M If the meter is located at a and the point of delivery is at c Figure 6 the results shown below are the settings A, B, C, and D for the M Line 3 may remain blank NONE, by default. Then, in the pages following, several cases are described which illustrate how to calculate the settings A, B, C, and D for whatever orientation the meter will have relative to the point of delivery. Notice that the meter accepts settings in scientific notation e.
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Since the line segment ab is on the opposite side of the transformer relative to the meter, the coefficients Aab and Cab must take into consideration that the current passing through line segment ab is not the same as the current sensed by the dislay.
No password is needed to unprotect the sheet. Case 1 Case 3 Case 5 Add Transformer losses only. Case 4 Same as Case 2 No compensation necessary. Since the compensated line is on the opposite side of the transformer relative to the meter, the coefficients AL and CL must take into consideration that the current passing through line segment ab is not the same as the current sensed by the meter.
You may type anything you like for the Alphanumeric Label but the space is limited to a maximum of eight characters, so you may need to be a little creative e.
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The spread sheet may be downloaded from the public FTP Site. To subtract losses, be sure the settings are all negative. In order to see the uncompensated watts and VARs, you must first create and then enable a custom screen on the display.
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. Same as Case 1 Subtract Line cd losses only. Line losses for segment ab plus transformer losses, where the meter is on the same side of the transformer as the compensated line.
Resources to Familiarize yourself with the implementation of Loss Compensation on the M If the meter is located at d and the point of delivery is at a Figure 12 the results shown below are the settings A, B, C, and D for the M Just below the space for the injected values, there is a section indicating the predicted values for uncompensated total watts, uncompensated total VARs, uncompensated total VA, compensated total watts, and compensated total VARs.
By making the settings positive, the losses will be added to the uncompensated measurements in order to produce compensated measurements.
It’s a community-based project which helps to repair anything. Users who do not intend to use system losses should simply set E equal to zero. Since the meter is upstream from the point of delivery, all four settings must be negative in order for the losses to be eisplay from the uncompensated power.
If the meter is at b and the point of delivery is at c Figure 9 then multiply the results shown below by negative one before entering as the settings A, B, C, and D. On the previous page the four configuration settings use upper displqy italic letters A through D.
This is done regardless of whether the Page6 transformer is delta or wye connected. If the meter is located at a and the point of delivery is at c Figure 6 the results shown below are the settings A, B, C, and D for the M As such, E is not a physical property of any displaay line, transformer or the meter, so no further guidance on how best to calculate the coefficient E can be m60 here.
Notice that the meter accepts settings in scientific notation e.
There are also cells available where you can enter the signals that you plan to inject into the meter when commissioning the meter. These are generally the impedance characteristics of any lines, the test data for the transformer, the CT and VT ratios of the instrument transformers.
The test results and operating characteristics of the transformer shown in Table 1, below, are required in order to calculate the meter settings A, B, C, and D. The screen will look something like Figure A2.
MNtech M – Review Display Systems Ltd
Page11 If the meter is located at a and the point of delivery is at d Figure 13 the results shown above are still the settings A, B, C, and D for the M Obviously, the spread sheet will only prevent errors when properly used. Results for Case 1: But for the purposes of calculating the meter settings, power flowing in the direction indicated by the arrow in Figure 2 corresponds to a positive display on the M Configure the M, Part 2: A meter having model number MM3P, for example, has the M3 option code and can support loss compensation.
Use the process described in Case 1 to determine Aab and Cab. See note 2, below.