Dranetz HDPQ SP Now Has Power From the Phase

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HDPQ SP models are contained in an IP65 (weather/hardened) enclosure

Edison, New Jersey, November 14, 2017 – Power from the phase has now been added to the Dranetz Technologies IP65 rated Dranetz HDPQ SP power monitoring instruments. The Dranetz HDPQ Visa SP, Guide SP, Xplorer SP, and Xplorer 400 SP instruments are intended for use in harsh, outdoor and remote environments, or for applications where a LCD display is undesirable.

“Having the ability to power the Dranetz HDPQ SP instruments from the circuit being measured is a great convenience to users, and it also enhances their safety, said Ross Ignall, Dranetz Director of Product Management. “With the new, built in, 600V AC/DC power supply, users no longer have to locate a separate 120/230V power source for the instrument; they now have the choice to either power the instrument from the circuit being measured or from a separate power source.”

Dranetz HDPQ users can now choose between a traditional portable instrument with a local 7” color touch LCD display or a SP version that can be powered from the phase, and is housed in an IP65 enclosure without a local LCD display. The HDPQ portable (with 7” display) and SP (IP65 enclosure without display) versions of each model have exactly the same measurement and strong remote communications capabilities.

The Dranetz HDPQ Family of Power Quality, Demand & Energy instruments not only offer the industry’s best measurement capabilities, but also have the most powerful communications capabilities in the industry making it ideal for commissioning, engineering, and troubleshooting applications. The powerful communications available in the Dranetz HDPQ line enhances the end users productivity and safety by allowing users to control the instrument and download data remotely. Users no longer have to subject themselves to hazardous environments and can now manage power surveys remotely from the safety and comfort of an office or other more convenient location.

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Investigating “Blinky” Lights

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The HDPQ family of products have a number of trigger mechanisms for capturing different types of power quality phenomena.   Most users are familiar with settings for sags and swells, but those typical limits usually don’t capture the “blinky lights” problems.   While the Pst (perceptibility short term) parameter will indicate whether the voltage supply is likely to produce light flicker when the Pst is close or above 1, it doesn’t help determine where it comes from or what the source is since it is a ten-minute journal value.  The graph below illustrates such.

The voltage and current plots show that it is an increase in current over 100A that results in the voltage decreasing by 5-8V every 15 minutes. The rms variation limit for sags is set to 90% of the nominal 120V or 108V, so no sag was reported.   In above example, the red dotted line is that sag limit.  Yet the residents complained of “blinky lights” while the Pst does increase to 0.8 each time, not over 1.  

The rms deviation transient trigger is one method to capture such as an event.  However, there is a parameter that is included in the IEC and IEEE standards that was defined just for such disturbances.   It is the RVC or Rapid Voltage Change.    It looks for a sudden change in the voltage from one steady state value, waits for stability in any continued variations until stable at another steady state voltage value for 1 second or more.    The delta change limit is typically set to 2-3%.  Since the variation shown in the data above was 4-7%, this mechanism was ideal for capturing and reporting each time that it happened.  An example at 22:189:54 is shown below.   The rms deviations and wave shape triggers also captured the event, but they also triggered on other disturbances that weren’t part of the investigation, which produced extra data to sort through

#39 10/03/2017 22:02:05.297 AV Misc at 0.8 Deg
#40 10/03/2017 22:02:05.297 BV  Misc at -179.1 Deg
#41 10/03/2017 22:02:05.306 AVRmsDev  Normal To High
#42 10/03/2017 22:02:05.306 BVRmsDev  Normal To High
#44 10/03/2017 22:02:05.323 AVRmsDev  High To Normal
#45 10/03/2017 22:02:05.323 BVRmsDev  High To Normal
#48 10/03/2017 22:18:54.874 AV  Misc at 0.7 Deg
#49 10/03/2017 22:18:54.874 BV  Misc at -179.0 Deg
#50 10/03/2017 22:18:54.874 AVRmsDev  Normal To High
#51 10/03/2017 22:18:54.874 BVRmsDev  Normal To High
#52 10/03/2017 22:18:54.883 A Delta V RVC  Rapid Voltage Change 0.175 Sec.
#53 10/03/2017 22:18:54.883 B Delta V RVC  Rapid Voltage Change 0.259 Sec.

The right tool for the right job has always been a wise adage.  Setting the right tool up with the right limits on the right parameters to help solve the customer’s problems is an extension of that idea that can help get the answer quickly and clearly.   By the way, the answer here was a common answer for such problems.   The HVAC unit was causing the blinky lights.

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• 4 QUADRANT MEASUREMENT - Measurement of energy import and energy export

• MULTIFUNCTIONAL - Multifunctional meters with up to 33 measured quantities (e.g. reactive power,
  
  apparent power, power factor, THD, frequency and more)

• INTERFACES - Flexible communications and remote read-outs: LON, M-Bus, Modbus RTU, Modbus TCP, or BACnet

• POWER MONITORING - Value priced power monitoring measures voltage and current THD, as well as neutral THD

• SMARTCOLLECT Software - Use SMARTCOLLECT software to manage multiple ENERGYMID and other meters to collect data remotely, automatically generate reports, as well as perform other analysis functions

ENERGYMID Product Page

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For more information, please contact us at sales@dranetz.com

Dranetz Power Quality Seminar - Chicago, June 7, 2017

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No-Cost Educational Seminars from Dranetz 

Dranetz Technologies provides no-cost educational seminars at select cities in the continental US throughout the year. This incredible value is open to anyone interested in learning about power quality, and only requires registration to reserve your seat. All power quality seminars are 1/2 day and run from 8:00 a.m. to 12:00 noon, and a continental breakfast is included from 7:30 a.m. to 8.00 a.m.

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June 7, 2017

Holiday Inn Chicago West – Itasca

860 W. Irving Park Road
Itasca, IL 60143
(630) 777-2340

Continental Breakfast Included 7:30 a.m. – 8:00 a.m.

Online Registration

Dranetz Power Quality Seminar Agenda

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June 14, 2017

Hilton Garden Inn/Redstone Arsenal

301 Blvd. South Sw.
Huntsville, AL  35802
(256) 881-4170

Online Registration

Dranetz Power Quality Seminar Agenda

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June 22, 2017

Hyatt Place Boston/Braintree

50 Forbes Road
Braintree, MA 02184
(781) 848-0600

Online Registration

Dranetz Power Quality Seminar Agenda