Megger VLF CR-40 Operating Manual
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Megger VLF CR-40 Operating Manual

Megger VLF CR-40 Operating Manual

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Operating Manual
VLF Test System
VLF CR−40 / 60 kV
Issue: 3 (01/2010) – EN
128312953

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Summary of Contents for Megger VLF CR-40

  • Page 1 Operating Manual VLF Test System VLF CR−40 / 60 kV Issue: 3 (01/2010) – EN 128312953...
  • Page 2 man_vlf_cr_40_60_standalone_en_03-4.doc...
  • Page 3 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 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

    TABLE OF CONTENTS GENERAL INTRODUCTION ............. 8 Safety Precautions ..................9 1.1.1 General Safety Precautions ..............10 1.1.2 Supplementary Guidelines ................ 11 1.1.3 Danger Due To Returning Voltage From Space Charge ......12 1.1.4 General Rules for Dealing with High Voltage ..........13 TECHNICAL DESCRIPTION ..........
  • Page 6 Starting the Test / Location ..............5-34 ADDITIONAL FUNCTIONS ..........6-37 Adjustment of Language ..............6-37 Viewing the System Information ............6-37 Viewing / Setting the System Parameters .......... 6-38 Entering / Changing the Administrator Password ......6-39 Returning to the start menu ..............6-40 Optional Features ...............
  • Page 7 Index Of Figures Fig 1: Representation of the test voltage characteristics (Device option Plus) ....19 Fig 2: voltage waveform during polarity inversion ............19 Fig 3: Operating module, Front View ................20 Fig 4: Display of the Operating module (View of the standard operating mode) ... 21 Fig 5: Connections at the right hand side of the VLF Test System .......

  • Page 8: General Introduction

    GENERAL INTRODUCTION The VLF Test System shall be used for the stated field of application in cable diagnosis only. Any other application is strictly forbidden! Hagenuk KMT cannot be made liable for any damage to persons or matter caused by using the system for some other application.

  • Page 9: Safety Precautions

    Safety Precautions Each person involved in the assembly, maintenance, and repair of this system is required to have read this manual carefully. At the time of supply, this system and its supplementary equipment are in line with the state of the art in safety control. Due to the operating procedures there may be parts and places of the system and its peripherals, however, which cannot be protected properly without unreasonably interfering with their function and control.

  • Page 10: General Safety Precautions

    ELECTROTECHNICAL INSTRUCTIONS The system and all its peripherals shall be connected according to instructions. All relevant standards such DIN and VDE respectively, have to be met. Any repair or maintenance operation may be carried out only after all circuit have been shut down (are in a dead state) and only by an electrical expert according to UVV.

  • Page 11: Supplementary Guidelines

    Fuses It is absolutely inadmissible to patch or bridge a fuse or to use a patched fuse. When replacing a fuse: Always use a fuse of identical or lower current rating and characteristic (slow, fast, superfast action). Never unscrew or pull out a fuse while it is under load. It is inadmissible to use a fuse for switching a circuit.

  • Page 12: Danger Due To Returning Voltage From Space Charge

    1.1.3 Danger Due To Returning Voltage From Space Charge - Remove earth connection and short circuit only when the object under test is going to be put into operation again. - As a basic principle capacitors and cables which are out of operation must be earthed and shorted! Attention! The test object has to be connected to earth and shorted after terminating...

  • Page 13: General Rules For Dealing With High Voltage

    How to Deal With Connectors and Cable Accessories Connect every electrical removable appliances only by the connectors (plug, socket) intended for this purpose. Do not use any adapter or plug which matches a socket for some other voltage. Use appropriate lock washers and spring washer to make every cable connecting terminal safe against becoming detached.

  • Page 14: Technical Description

    TECHNICAL DESCRIPTION Technical Specification 2.1.1 VLF Test System 40 kV Output voltage, DC 3 - 40 kV Output current source 7 mA Range of indication, Leakage current measurement 0 - 7 mA Resolution of indication 10 µA Output voltage, VLF 0 - 40 kV Frequency 0,1 Hz...

  • Page 15: Vlf Test System 60 Kv

    Supply voltage 230 V ±10 %, 50 ... 60 Hz Option 120 V ±10 %, 60 Hz Power consumption 500 VA at maximum Operating temperature range -25 °C ... +55 °C Operating humidity 30 °C, 93 % rel. humidity Storage temperature range -40 °C ...

  • Page 16: Accessory Equipment

    Discharging unit integrated, 1,5 µF in 2 s Supply voltage 230 V ±10 %, 50 ... 60 Hz Option 120 V ±10 %, 60 Hz Power consumption 300 VA at maximum Operating temperature range -25 °C ... +55 °C Operating humidity 30 °C, 93 % rel.

  • Page 17: Description Of The Vlf Test System

    Description of the VLF Test System Based on comprehensive scientific research, relevant DIN and VDE standards which we recommend to your attention, and more than 10 years of practical experience on more than 300 VLF Test Systems, we can today take it for granted that the 0.1 Hz VLF method for testing cables with plastics insulation outclasses any other test method using DC voltage or power-frequency AC voltage as used so far.
  • Page 18 Every cycle starts with a charging phase in which the test object as well as the back-up capacitor switched in parallel are charged from a DC source until the desired test voltage is reached. After a period of 5 seconds, the voltage source will be disconnected from the system by S1(S2) and via R1(R2) discharged.
  • Page 19 36 kV = 3 x U 36 kV = 3 x U 33 kV 33 kV 20 s 33 kV 36 kV = 3 x U Residual charging Fig 1: Representation of the test voltage characteristics (Device option Plus) time Fig 2: voltage waveform during polarity inversion man_vlf_cr_40_60_standalone_en_03-4.doc...

  • Page 20: Description Of Components Of The Vlf Test System 40 / 60 Kv

    Description of components of the VLF Test System 40 / 60 kV 2.3.1 Operating module 11 10 9 Fig 3: Operating module, Front View Key "Emergency Off" Analogue indication instrument test voltage (kV) Display Menu key F1 Menu key F2 Knob / push-button Intake slot for the System Card Protocol printer...

  • Page 21: Display Of The Operating Module

    2.3.2 Display of the Operating module VLF-Test 10kV 0.0kV 5min 0.00mA Prepared. HVOn? Fig 4: Display of the Operating module (View of the standard operating mode) Representation of parameters with value and content resp. Representation of residual time and/or measuring values Representation of operator guidance / status display The representation of the residual time / measuring values (Fig 4;...

  • Page 22: Vlf Test System As A Whole

    2.3.3 VLF Test System as a whole VLF Test System 40 kV VLF Test System 60 kV Operating module Operating module HV module HV module Fig 5: Connections at the right hand side of the VLF Test System Mains input with F1, F2 Terminal clip for earth connection of the Operating module Terminal clip for earth connection HV module man_vlf_cr_40_60_standalone_en_03-4.doc...

  • Page 23: Fig 6: Connectors On The Rear Of The Vlf Test System

    Fig 6: Connectors on the rear of the VLF Test System Test voltage output Terminal clip for signal ground man_vlf_cr_40_60_standalone_en_03-4.doc...

  • Page 24: Protection Covers Of The Modules

    2.3.4 Protection covers of the modules Test System Fig 7: Protection cover of the Operating module Fig 8: Shorting device / Protection cover of the HV module man_vlf_cr_40_60_standalone_en_03-4.doc...

  • Page 25: Transportation Protection Bottom From The Operating Module

    2.3.5 Transportation protection bottom from the Operating module Verriegelt Verriegelt Locked Locked TRANSPORTBODEN, NUR FÜR BEDIENMODUL VERWENDEN USE TRANSPORT PROTECTION BOTTOM FOR CONTROL UNIT ONLY Entriegelt Entriegelt Unlocked Unlocked Fig 9: Transportation protection bottom from the Operating module man_vlf_cr_40_60_standalone_en_03-4.doc...
  • Page 26 man_vlf_cr_40_60_standalone_en_03-4.doc...

  • Page 27: Description Of The Test Method

    DESCRIPTION OF THE TEST METHOD Because of the space charges formed in the dielectric of the cable, DC test methods prove to be dangerous when applied to PE and VPE cables and should therefore never be used on such types of cables. VLF testing is an alternative test method.

  • Page 28: Setting-Up Operation

    SETTING-UP OPERATION Safety Precautions Before starting any operation, always observe the 5 rules of safety: • Disconnect the test object • Protect it against reclosure • Check the absence of voltage • Connect it to earth and short-circuit it • Cover all neighbouring parts carrying voltage or seal them off by a barrier In order to prevent any damage to persons and/or installations that might directly be caused by the operation of the VLF Test System alone or in combination with other systems or instruments, always observe the following safety precautions:...
  • Page 29 Disconnect the test object to ensure that no dangerous voltage can get to unprotected places or unprotected technical equipment. Whenever the VLF Test System is operated, a second person must be present within viewing and hearing distance who can recognise possible hazards and press the Emergency Off key.

  • Page 30: Electrical Connection Of The Vlf Test System

    Electrical Connection of the VLF Test System 4.2.1 General Rules for Making Connections Always keep in mind that you are required to comply with all relevant safety precautions for high voltage and power systems when you bring the system into service! In particular, make sure that the test object is connected to earth and shorted and the cable testing apparatus is switched off when it is connected to the test object or disconnected from it.

  • Page 31: Connecting The Test Object

    4.2.3 Connecting the Test Object Plug the connector of the high-voltage connecting cable into the HV module (see Fig below) and fix it by turning the latch. Plug the connector of the signal ground into the corresponding terminal (see Fig 6, item 2). After that, connect the test cable to the earthed test object.

  • Page 32: Execution Of Tests

    EXECUTION OF TESTS VLF / DC Test For high voltage tests by using the VLF Test System to be carried out, all electrical connections must have been established as described in sections before. Now the test system can be put into operation. After activation of the "Mains On" pushbutton (Fig 3, item 12) the system can be operated using the knob / push-button (Fig 3, item 6) and the display (Fig 3, item 3).

  • Page 33: Fig 13: Selection Of The Test Voltage

    Now the user is able to choose the operation mode out of VLF, DC– and DC+ (only available on systems with two voltage sources) by turning the knob / push-button (Fig 3, item 6). The selection has to be confirmed by a singular pressure on the knob / push- button (Fig 3, item 6).

  • Page 34: Sheath Fault Location

    Sheath Fault Location Following a failed sheath test with DC voltage fault location based on the step voltage method can be immediately performed at the cable under test with the VLF test system serving as voltage source. The test current coming from the pulsed DC source is flowing into the ground at the point of fault and results in a maximum step voltage at the fault.
  • Page 35 It depends on the following conditions whether or not HV can be switched on using the respective pushbutton (Fig 3, item 10): the key "Emergency Off" (Fig 3; item 1) is not activated, the key-operated switch "Interlock" (Fig 3; item 11) is activated, both the Operating and the HV module are assembled in proper form.

  • Page 36: Fig 18: Start Menu After The Test Has Been Finished

    VLF mode 20kV F1:Print 15min F2:Setup Test time over Fig 18: Start menu after the test has been finished In addition, the voltage source is / can be switched off • by activating the “Emergency Off” switch (Fig 3; item 1), •...

  • Page 37: Additional Functions

    ADDITIONAL FUNCTIONS Adjustment of Language By pressing the F2 key (Fig 3, item 5) and turning the knob / push-button (Fig 3, item 6) the "User setup" menu can be accessed. Here the language on the display and in the protocol printing of the VLF Test System can be adjusted.

  • Page 38: Viewing / Setting The System Parameters

    Viewing / Setting the System Parameters Certain test parameters are permanently stored as system parameters and secured against unauthorized changes. As a standard user you can only view these parameters. In order to adjust these parameters you have to gain administrator rights by entering the administrator password first (see section 6.4).

  • Page 39: Entering / Changing The Administrator Password

    Entering / Changing the Administrator Password By pressing the F2 key (Fig 3, item 5) and turning the knob / push-button (Fig 3, item 6) the "Password" menu can be accessed. When entering this menu, you have to enter the administrator password in order to gain the administrator rights enabling you to adjust the test parameters accessible via the “Parameters”...

  • Page 40: Returning To The Start Menu

    After the password has been entered and accepted, it can be changed. In order to change the password, you have to access the “Passw. Set” menu right after you gained administrator rights. The new password has to be entered the same way as the current password has been entered (see previous page).

  • Page 41: Optional Features

    Optional Features Detection of Breakdown and Short Circuit For systems equipped with the optional breakdown and short circuit detection, the test voltage will be immediately switched off in any case of a breakdown in the cable under test. The status message "Cable break down" is indicated on the display. The level of the break down voltage is indicated on the display.

  • Page 42: Internal Protocol Printout

    Internal Protocol Printout If the VLF Test System is equipped with an internal protocol printer (Fig 3, item 8), data logged during a cable test can be printed out on this printer. By pressing the F2 key (Fig 3, item 5) and turning the knob / push-button (Fig 3, item 6) the "Protocol"...
  • Page 43 • Printout "Extended": - All information listed under “Standard” - Maximum test voltage, test voltage increase, step increment, rest peri- od of the ramp (ramp pause) - Settings for logging and printing - User profile, service / administrator mode (if applicable) - Measured data (time, test voltage, current) of the charging period •...

  • Page 44: Using A Systemcard

    Using a SystemCard 7.4.1 Purpose of a SystemCard If the VLF Test System has been equipped with the logging option, the measured data can be written to a so-called SystemCard which has the dimensions of a conventional credit card. The SystemCard can be used to store and transfer logged data (see section 7.4.3) and to hand over predefined test parameters to the system (see section 7.4.2).

  • Page 45: Preparing A Systemcard

    7.4.2 Preparing a SystemCard Using a SystemCard appropriately parametrized under WinkisVLF will enable you to make volatile (only for the cable test under way) or permanent changes to your device settings. Depending on how the card has been parametrized, either all or only certain test parameters are affected.

  • Page 46: Logging To Systemcard

    7.4.3 Logging to SystemCard By activating the logging function, measuring data logged during a cable test can be written to a SystemCard. These data may consist of system information, system / test settings, information about the course of the cable test, the measured data (test voltage, leakage current) and the test result.
  • Page 47 Depending on the logging mode, the following data is written to the SystemCard: • Protocol “Off”: If the protocol mode is set to “Off”, no measured data is written to the SystemCard. • Protocol "Standard": - System type and version - Test settings relevant for analysis - Date / time of test start - Result of the test and remaining test time...

  • Page 48: Operating The Test System With A Systemcard

    7.4.4 Operating the Test System with a SystemCard In order to use a SystemCard for parametrizing the test system or storing the logged data, the card has to be plugged into the respective slot (Fig 3; item 7) of the control unit prior to the start of the cable test (while the start menu is visible).

  • Page 49: Function User Setup / User Level

    Function User Setup / User Level By pressing the F2 key (Fig 3, item 5) and turning the knob / push-button (Fig 3, item 6) the menu "User Setup" can be accessed. After administrator rights have been gained as described in section 6.4, the “User Setup”...

  • Page 50: Re-Setting The System Settings / Deleting The Print Templates

    Re-Setting the System Settings / Deleting the Print Templates The user interface of the VLF Test System allows you to reset the non-volatile system settings back to the default factory settings and to delete permanently stored print templates. After administrator rights have been gained as described in section 6.4, the “Memory” menu can be accessed via the “Setup”...

  • Page 51: Adjustment Of The System Timer

    Adjustment of the System Timer If the test system is equipped with at least one of the system options “Logging” or “Protocol printout”, the system contains a battery-operated and crystal-controlled clock (see section 8.2). After activating of the Menu key F2 (Fig 3, item 5) and by turning the knob / push-button (Fig 3, item 6) the menu "Date / Time"...

  • Page 52: Maintenance And Troubleshooting

    Maintenance and Troubleshooting How to Exchange the Paper Roll or Ink Ribbon of the Printer The optional built-in printer is housed in a robust metal case with removable front cover. To exchange the paper roll or the ink-ribbon cartridge, first remove the front cover from the printer.

  • Page 53: Replacing The Battery Of The System Clock

    How to exchange the paper roll The container can hold paper rolls with up to 50 mm diameter. First follow step 2 and remove the ribbon cartridge. Remove the spindle from the core of the empty roll and insert it into the core of the new paper roll. If necessary, cut the front edge of the paper strip in a straight line.

  • Page 54: Connecting Cables, Hv Couplings

    Connecting Cables, HV Couplings Maintenance and troubleshooting include regularly checking the connecting cables such as earth cables, mains cables and test cables for being in good repair. In addition to that we recommend that the HV couplings at the Operating module and HV module should be checked with respect to mechanical integrity and cleanness.

  • Page 55: Operational Messages About State Of System

    8.4.2 Operational Messages about State of System The following operational messages inform the operator about the current state of the system. You need not confirm any of them. The system, however, expects the operator to make one of the entries listed in the table. Code Operational message Description...
  • Page 56 Code Operational message Description Input Card is faulty ! Content of system card none pull out is faulty. card ! Really this card ? System is waiting for confirmation of card. Reading card... System is reading data none from the system card. Checking...
  • Page 57 Code Operational message Description Input Set user language In Setup: Prompting to rotary knob + OK make entry Set user level In Setup: Prompting to rotary knob + OK make entry F1= set! else OK In Setup: query for F1: set or OK setting the clock (abortion)

  • Page 58: Operational Messages About Switching Conditions

    8.4.3 Operational Messages about Switching Conditions The following operational messages inform the user about the switching conditions prior to "HVon" and about the cause of shut-down after "HVoff". These messages need to be confirmed by the operator with "OK" unless they disappear on their own accord after having set a switching condition.
  • Page 59 Code Operational Description Input message Breakdown in cable High voltage has been Possible result of a switched off by system cable test after breakdown in cable. Cannot be charged High voltage has been Possible result of a switched off by system cable test due to breakdown of voltage.

  • Page 60: Error Messages And Warnings

    8.4.4 Error Messages and Warnings With the exception of operating errors, every error, once it has occurred, is reported by way of a two-digit error code. Each of these messages needs to be confirmed by the operator with "OK", further procedures are determined by the system. Code Operational Description...
  • Page 61 Code Operational Description Input message Unknown master The software version of Insert Master Flash with master appropriate software compatible with version software version of the slave. Slave timeout Communication between LON Bus / wiring / power master slave supply interrupted (master does not respond any more).
  • Page 62 Code Operational Description Input message Jumper changed Jumper coding of module Undo changes or make "Control node VLF…" changes only when has been changed during system is switched off operation. Module coupling The connection between Restore connection, the modules of the sys- check hardware signal tem has been interrupted.
  • Page 63 Code Operational Description Input message VOLTAGE Danger! Voltage monitor Eliminate possible FOUND in reports residual voltage residual voltage at HV measuring divider. manually. Check discharge switches and voltage monitoring. Overvoltage Voltage monitor in slave Check voltage control of reports overvoltage at HV HV sources, check measuring divider.
  • Page 64 Code Operational Description Input message Setup is faulty System of conditions on Software trouble - must master inhibits start of HV not occur during opera- operation if user level is tion inappropriate. Access denied Entered password is To administrator, wrong and will be customer service und rejected.
  • Page 65 Code Operational Description Input message Check sum error Some check-sum error Data are stored on card has occurred when in an EEPROM. Life time reading from the system expired? card. Unlocked system Only in test lab: Only in test lab: Automatic configuration Enable configuration interlock is blocked.
  • Page 66 The system cannot be Only for service: calibrated in the active Choose DC mode operation mode. Mainten. Maintenance is required Please make an Required due to the high amount of appointment with your operating hours. nearest Megger service station. 8-66 man_vlf_cr_40_60_standalone_en_03-4.doc...
  • Page 67 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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Vlf cr-60

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