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PMI 2SX Series Скачать руководство пользователя страница 11

11 4.9 2SX-Series Scanner Options

recording is possible with the Power option. This allows the 2SX-Series Scanner
to compute and record real, reactive, and apparent power, as well as power
factor. Adding the Harmonics and Waveform Capture option gives the ability
to monitor voltage and current harmonics, as well as capture raw waveform
data. The Memory option doubles the available memory for longer recording
times. The Battery option lets the 2SX-Series Scanner continue recording during
an outage.

4.9.1 Current

The current option allows the 2SX-Series Scanner to measure and record the load
currents from the two single-phase legs. The currents are sampled just like the
voltage channels, 128 times per cycle. These samples are used to create one
cycle RMS values, and are recorded like the voltage channels. The 2SX-Series
Scanner with the current option contains two internal current transformers
to pick up the current signal– no external CTs or clamps are necessary. The
currents are measured through the lower two blades in the meter adapter
housing.

4.9.2 Power

The power option allows the 2SX-Series Scanner to compute and record the power
consumed by the loads on the service. Real power (watts), reactive power
(vars), apparent power (volt-amps), and power factor are computed for each
leg. These are computed using the voltages from line to neutral, and current
through each leg. The power option also includes extra memory so that all the
power quantities may be recorded without reducing the recording time. The
2SX-Series Scanner must have current measuring capability to compute power.

4.9.3 Harmonics and Waveform Capture

The Harmonics and Waveform Capture option give the 2SX-Series Scanner the
ability to measure and record voltage and current harmonics, as well as raw
waveform data. Stripcharts of selected voltage and current harmonics may be
recorded, up to the 31st, as well as daily profiles of total harmonic distortion. In
addition, raw voltage and current waveforms may be captured based on trigger
conditions set with Winscan. This option also includes extra memory so that
harmonic stripcharts may be recorded without lessening the total recording time.
The 2SX-Series Scanner must have the power option installed to measure
harmonics.

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Содержание 2SX Series

Страница 1: ...oltage range is 0 to 290 volts allowing the measurement and recording of severe voltage variations on 120VAC single phase lines Inside its lightweight rugged enclosure state of the art electronics mea...

Страница 2: ...ly remove the revenue meter before attempting to remove the Scanner from the meter socket The RJ 11 serial port is optically isolated from the 120VAC line However to insure user safety and prevent dam...

Страница 3: ...data files and documentation for Winscan and all Scanners in Adobe Acrobat format Acrobat reader and the latest firmware for all Voltage Scanners 3 2 Installing the PC software Winscan Insert the CD R...

Страница 4: ...tallation site using normal safety pre cautions Make whatever notations your procedures require about the status and identification of the meter at the time of removal Attach the ground clip exiting t...

Страница 5: ...Scanner when it is plugged in The 2SX Series Scanner can detect that it has been unplugged from a meter base and will not continue to record under battery power if it is removed from service as oppose...

Страница 6: ...nicate with Winscan running on a PC or laptop to receive its initialization and to download data Use the supplied S Series Scanner serial cable to connect the 2SX Series Scanner to a PC Plug the DB9 c...

Страница 7: ...indows 98 the infrared port on laptops is not compatible with the infrared port on the 2SX Series Scanner A serial cable must be used to communicate directly with a laptop 4 7 Using the LDU The LDU ha...

Страница 8: ...will show you the type of hookup wye or delta the recording interval and the threshold settings Press the BLUE key to go back Move to the DIA option using the arrow keys and press SET to select it The...

Страница 9: ...n menu Once the scanner is powered and the PDA is communicating with the scanner tap the PalmScan icon to reach the Main Menu consisting of 3 commands LDU Comm and Files 4 8 1 LDU This mode allows the...

Страница 10: ...K to initiate the transfer Depending on the size of the file the process could take several minutes The download is complete when the Main Menu appears Back at the office the PDA may be connected to t...

Страница 11: ...s in the meter adapter housing 4 9 2 Power The power option allows the 2SX Series Scanner to compute and record the power consumed by the loads on the service Real power watts reactive power vars appa...

Страница 12: ...uffix giving an iVS 2SP Adding Harmonics creates an iVS 2SX PH Memory adds an M and the Battery option adds a B to the model Thus a fully loaded 2SX Series Scanner would be an iVS 2SX PHMB Since the p...

Страница 13: ...re important distur bances Although it is often possible to use regulatory limits or other known standards to set thresholds this can be a chicken and the egg type problem sometimes you need to know s...

Страница 14: ...aph you can see power quality events such as single cycle voltage sags and current surges as well as long term voltage trends With the graph an entire recording session can be examined at a glance 5 2...

Страница 15: ...power and power factor With the harmonics option the 2SX Series Scanner can record stripcharts of harmonic magnitudes Typically only a few stripcharts are needed at one time All the Stripcharts share...

Страница 16: ...left to record for days since it would only hold the last few hours of Stripchart data The best use in this case is to set the Stripchart to one second then cycle the load such as the elevator for a w...

Страница 17: ...seful to see if harmonics are present The total recording time is shown by Winscan as Stripcharts are enabled and disabled during the Scanner setup Another method to increase Stripchart memory is to r...

Страница 18: ...to reflect average line conditions the more loads included in the recording the better the average Monitoring a single small load such as a small office building would not create a very good profile o...

Страница 19: ...of the time Where the Daily Profiles give average current power factor etc for distribution profiling the histograms show what values are the most common the mode in statistical terms 5 4 1 What s Rec...

Страница 20: ...ng at the nearby bins you know how many cycles the voltage was near those extremes For example if all the bins below 110 volts are zero then you immediately know that there was not even a single cycle...

Страница 21: ...minute then the Stripchart voltage averages will match the Minute Histogram counts Like the Cycle Histograms there are no settings for the Minute Histogram All available Minute Histograms in a Scanner...

Страница 22: ...n compute power 5 6 1 What s Recorded Each cycle the real reactive and apparent power values are computed and added to the running totals for the recording session These values include the effects of...

Страница 23: ...or 480 volts If the difference between the standard voltage and either the maximum or minimum voltage was more than the threshold a Significant Change is recorded In addition the voltage either the ma...

Страница 24: ...cant Change if the sag is greater than the threshold If this happens the sag voltage becomes the standard which will trigger another Significant Change if the voltage returns its previous level The Si...

Страница 25: ...nominal voltage selected by the Abnormal Voltage record type during the two minute count down The Event Change Nominal voltage is specified by the user and is not picked by the Scanner The second para...

Страница 26: ...ettings are separate for each channel Another channel may trigger its own Event Change while other channels have running Events resulting in overlapping Events 5 8 2 What s Recorded When an Event Chan...

Страница 27: ...report Usually Event Change is not the first report to analyze in a Scanner recording due to its complexity Check the voltage Stripchart for min or max voltages out of tolerance or the Significant Cha...

Страница 28: ...fferent for various Scanners but every Scanner with Event Change can record hundreds and most over one thousand records 5 9 Power Outage The Power Outage report lists the date and time of all outages...

Страница 29: ...arge enough Flicker is computed once per second based on the previous second s one cycle max min and one second average RMS voltage levels The thresholds are given as a percentage If the max min or av...

Страница 30: ...the low threshold exceedence is indicated by a green LED on the front panel and the high threshold exceedence by a red LED When the trigger occurs the event is timestamped to the nearest second There...

Страница 31: ...eshold actually creates two trip points one above the nominal and one below For example consider a setup where the nominal is 120 volts the low threshold is 6 and the high 12 The low trip points becom...

Страница 32: ...be set as small as one second or as large as 255 seconds 5 12 Loose Neutral The Loose Neutral report shows whether the typical symptoms of a loose neutral have occurred This report is intended for si...

Страница 33: ...required 12 volts specified by the range value of twice the nominal 240 volts If these voltages persist for 5 seconds in a row then a Loose Neutral record will be triggered If one voltage leg changes...

Страница 34: ...an the size of four hours of Stripchart data at one minute intervals 5 13 1 Trigger Logic Waveform Capture uses a single threshold for triggering This threshold is a percentage At the end of each 60Hz...

Страница 35: ...urbance can be seen in the Waveform Capture report The peak voltage length of the sag or swell and the coupling from phase to phase are easily seen in the graph Sometimes there are clues regarding the...

Страница 36: ...he higher the level of current harmonics Frequently the neutral current looks much less sinusoidal than the line currents due to the fact that some harmonics don t cancel out in a three phase system e...

Страница 37: ...g from any breach of warranty Equipment Return If any PMI product requires repair or is defective call PMI at 800 296 4120 before shipping the unit to PMI If the problem cannot be resolved over the ph...

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