Megger UHF PDD User Manual
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Megger UHF PDD User Manual

Megger UHF PDD User Manual

Uhf pd detector
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UHF PDD
UHF PD Detector
USER GUIDE
Issue:
A (01/2023) - EN
Article number:
85393
1

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Summary of Contents for Megger UHF PDD

  • Page 1 UHF PDD UHF PD Detector USER GUIDE Issue: A (01/2023) - EN Article number: 85393...

  • Page 3: Consultation With Megger

    E: team.dach@megger.com  Megger All rights reserved. No part of this handbook may be copied by photographic or other means unless Megger have before-hand declared their consent in writing. The content of this handbook is subject to change without notice. Megger cannot be made liable for technical or printing errors or shortcomings of this handbook.

  • Page 4: Terms Of Warranty

    During the period of warranty, Megger agree to repair faulty parts or replace them with new parts or parts as new (with the same usability and life as new parts) according to their choice.

  • Page 5: Table Of Contents

    Contents Contents Consultation with Megger ....................3 Terms of Warranty ......................4 Contents ........................... 5 General Notes ....................7 Technical description ..................9 System description ..................... 9 Technical data ....................11 Connections, controls and display ..............12 Start-up ......................13 Securing the power supply ................

  • Page 7: General Notes

    It is important to observe the generally applicable electrical regulations of the country in which the device will be installed and operated, as well as the current national accident from Megger prevention regulations and internal company directives (work, operating and safety regulations).
  • Page 8 In this case inform the operation person in charge who should inform the Megger service to resolve the problem. The instrument may only be operated when the malfunction is resolved.

  • Page 9: Technical Description

    Used in combination with the UHF coupler UHF C-1, likewise developed by Megger, the UHF PDD is especially suited for testing of live high voltage terminations, the failure of which is usually accompanied by the most devastating impacts on network operation.
  • Page 10 Technical description The product supplied comprises the following components: Included in delivery Quantity Component Description Item number UHF PDD Main device 1007234 (Standard) 1008524 (US version with deviating radio frequency) Charger 1007523 UHF DIPOL-230 UHF reference antenna for the 1008295...

  • Page 11: Technical Data

    Technical description Technical data The UHF PD Detector is defined by the following parameters: Parameter Value UHF frequency range 150 MHz to 1000 MHz RF frequency range 100 kHz to 70 MHz Measurement range -90 dBm … 20 dBm Resolution 1 dBm Accuracy ±1 dBm...

  • Page 12: Connections, Controls And Display

    Technical description Connections, controls and display The UHF PD Detector has the following connection, display and control elements: Control module Element Description Touchscreen Operating buttons USB socket for data export and firmware updates On/Off button (brief activation) Charging indicator light UHF useful signal input REF / RF / CAL This socket can be used for the following purposes:...

  • Page 13: Start-Up

    Always use only the supplied charger. • The ambient temperature should lie between 10 °C and 35 °C. • In the event of problems with the battery, contact your sales or service • partner at Megger. Do not open the device yourself.

  • Page 14: Connecting Antennas /Sensors

    Start-up Connecting antennas /sensors In principle, the most varied types of sensors and antennas can be connected to the Introduction device, providing they deliver a usable input signal. Besides UHF antennas and sensors, which deliver signals in the frequency range of 150 MHz to 1000 MHz (UHF mode), the detector is also suitable for the connection of TEV and HFCT sensors.
  • Page 15 Start-up In addition, it is possible to couple in a second "reference" signal in order to be able to compare the frequency spectrum of the useful signal with it. Connecting a suitable UHF reference antenna (for example, the included UHF dipole) to the input REF/RF/CAL is recommended.
  • Page 16 (see page 10). With the HFCT SC40 and the HFFCT 20, Megger also offers in its accessories range (see page 10) two HFCT sensors, which can be used outdoors, for measurement of partial discharges in cables and their components and that are designed to work perfectly with the device.
  • Page 17 Start-up HFCT and TEV sensors are connected to the output REF/RF/CAL The connection of a comparison or reference sensor is not possible in RF mode. Using TEV and HFCT The TEV and HFCT sensors can be used not only in the RF range, but also in the UHF range.

  • Page 18: Ensuring Network Synchronisation

    Start-up Ensuring network synchronisation Thanks to the comprehensive accessories, the network synchronisation required for reliable analysis of the charge pulses in the time-based display can be ensured in various ways. For the most reliable and therefore preferred method, the supplied network synchronisation sensor UHF MS5060 must be plugged into a network socket within wireless range of the detector (≤...

  • Page 19: Connecting Headphones

    Start-up It can also be attached in the shielded area of a cable end with the aid of the supplied hook and loop fasteners. Since in this case, synchronisation of the sensor to the magnetic field of the cable is to be preferred, in the software the setting ES5060 (H) must be selected accordingly.

  • Page 20: Principles Of Operation

    Principles of operation Principles of operation Operation Basic operation Operation is performed either using the operating buttons or via the touchscreen. While with touchscreen operation the desired functions are triggered with the brief press of a fingertip, the button operation is laid out as follows: Select required menu item •...

  • Page 21: First Steps

    Principles of operation First steps Switching on Only a few seconds after the detector is switched on with a brief press of the button the main menu appears. UHF partial discharge detector Spectrum Time Domain Level Select sensor type To ensure that the detector is working in the correct mode, the button should always be used first directly after switching on in order to select the connected sensor type.
  • Page 22 Principles of operation Creating a new In order to easily assign the saved measured data to the individual measurement measured data procedures / equipment at a later time point in the office, the button can be used at directory any time to create a new subdirectory in the internal memory. Immediately after the button is pressed, the on-screen keyboard is opened, with which the desired directory name can be entered.

  • Page 23: Performing Measurements

    Performing measurements Performing measurements Analysing the frequency spectrum In the spectrum analysis, the intensity of the recorded UHF signal (in dBm) in the Introduction frequency range is shown. Each measurement should always be started with this mode in order to obtain information on the base noise level and to identify ambient disturbances and conspicuous frequencies.
  • Page 24 Performing measurements marked frequency is displayed as Freq1 in the header and is then automatically preset when entering the Time domain operating mode. Ant: UHF Time: 20ms Band: 5MHz Freq1: 523MHz Using long taps at another position, up to 3 more markers (Freq2 ... Freq4) can be placed.
  • Page 25 Performing measurements The comparison of temporally offset recorded curves also makes it possible, for example, to compare the three phases of a cable system (see picture below). On the basis of such a comparison, it is usually even easier to determine which peaks in the spectrum are due to interference from the environment and which actually indicate partial discharges in one of the measurement objects.
  • Page 26 Performing measurements Icon Description Selection of the displayed curves. These buttons can be used to show or hide the following curves: (Ref) Signal maximum at the UHF or reference input. Maximum The points of this curve are derived from the highest values recorded during the respective signal recording period.
  • Page 27 Performing measurements The button can in addition be used to perform the following advanced settings: Parameter Description Pulse This menu item can be used to switch on the internal pulse generator for generator the purpose of a functional test (see page 37). Preamplifier Activates / deactivates the preamplifier (30 dB) at the start of the signal path.

  • Page 28: Analysing The Time-Resolved Signal

    Performing measurements Analysing the time-resolved signal This mode allows evaluation of a signal within a time range. Here, precisely those Introduction frequency windows must be considered in which the frequency spectrum was previously identified as conspicuous. In this mode, only the respective useful signal is displayed which means that even while measuring in the UHF range, the signal at the REF/RF/CAL input is not taken into account.
  • Page 29 Performing measurements The operating mode can be started from the main menu via the menu item Time Starting the operating Domain. mode If an abnormal frequency is identified during the analysis of the frequency spectrum and was marked (see page 23), it is preselected directly after entering the measurement screen.
  • Page 30 Performing measurements If it can be reliably ensured that the voltage used for the synchronisation is in phase with the measured object voltage, the period of a sine wave produced in the diagram reflects the actual progression of the mains voltage period. The illustrated phase position of the measured pulses thus corresponds to the actual phase position.
  • Page 31 Performing measurements By touching the symbol, the diagram can at any time be completely wiped clean and a new recording started. However, this button is only available if the parameter Persistency is set to Infinite (see following pages) and no automatic overwriting of the image points takes place.
  • Page 32 Performing measurements The button can in addition be used to perform the following advanced settings: Parameter Description Bandwidth Resolution bandwidth of the measurement filter (1, 5 or 20 MHz). Preamplifier Activates / deactivates the preamplifier (30 dB) at the start of the signal path.
  • Page 33 Performing measurements Parameter Description Resolution This menu item can be used to adjust the resolution of the diagram – i.e. the number of pixels displayed vertically and horizontally. In particular, in direct sunlight in outdoor use, it may be useful to reduce the resolution, since the wider image points are easier to read under these conditions.

  • Page 34: Analysing The Level

    Performing measurements Analysing the level In this operating mode, the signal progression for a certain frequency window can be Introduction recorded and displayed over a longer period of up to 40 seconds, which allows a trend observation of the discharge level to be made and aids in identification of sporadically occurring partial discharges.
  • Page 35 Performing measurements The most important measurement and display characteristics can be directly influenced Adapting measurement during measuring with the aid of the following buttons: and display parameters Icon Description Frequency at which the input signal is measured. You can either enter a frequency value or use the quick-selection buttons to switch between the frequencies marked in Spectrum mode (Marker1 ...

  • Page 36: Adapting Device Settings

    Adapting device settings Adapting device settings The menu item takes you from the main menu to the device settings, where you can make the following adjustments: Setting Description Copy data to USB For the purpose of archiving and further processing (see page 40), activating this button enables you to copy all measured data sets in the internal memory onto an inserted USB stick.

  • Page 37: Functional Tests

    Amplitude: -80 to -20 dB • Result: The spectrum should now display the pulse of the generator and look similar to the following screenshot: If the display deviates greatly, it is recommended to send the detector into a Megger service centre for calibration.

  • Page 38: Functional Test Of An Installed Uhf Coupler

    Functional tests Functional test of an installed UHF coupler The internal pulse generator can also be used to check the frequency transfer characteristics of an installed UHF coupler. To this end, the signal of the pulse generator must be coupled into the measurement object via the socket REF/RFF/CAL and the measuring signal output of the UHF coupler connected with the socket UHF .

  • Page 39: Using The Demo Box

    Using the demo box Using the demo box The optionally available demo box simulates partial discharges in the UHF frequency range and is ideal for demonstrating the function of the detector or practising with the device. Particularly clear results can be achieved if the demo box is connected in conjunction with the external synchronisation sensor UHF MS5060 to the same power strip and the output of the demo box is connected directly to the UHF input of the detector.

  • Page 40: Processing And Archiving Of Measured Data

    Processing and archiving of measured data Processing and archiving of measured data In an export, the measured data are stored in a chronological folder structure and grouped by day. Each of these folders contain an index.html file, through which all measurements of the respective day can be quickly and easily displayed as an overview in the browser.

  • Page 41: Maintenance, Care And Transport

    Maintenance, care and transport Maintenance, care and transport Repair and maintenance work may only be performed by Megger or authorised service Repair and partners and only using genuine replacement parts. Megger also offers its customers maintenance on-site service. Please contact your service centre as needed.

  • Page 42: Troubleshooting

    Troubleshooting Troubleshooting If problems occur, these can, under certain circumstances, be diagnosed and solved Independent fault using the following table: clearance Problem / error message Possible cause / remedy The software crashes and the Perform a hard reset by pressing the buttons software no longer reacts to user simultaneously on the front actions.
  • Page 43 Tento symbol indikuje, že výrobek nesoucí takovéto označení nelze likvidovat společně s běžným domovním odpadem. Jelikož se jedná o produkt obchodovaný mezi podnikatelskými subjekty (B2B), nelze jej likvidovat ani ve veřejných sběrných dvorech. Pokud se potřebujete tohoto výrobku zbavit, obraťte se na organizaci specializující se na likvidaci starých elektrických spotřebičů...

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