Megger VLF CR-28 Operating Manual
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Megger VLF CR-28 Operating Manual

Megger VLF CR-28 Operating Manual

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Operating Manual
VLF Test System
VLF CR−28 kV
Subject No.: 128312950
Mess- und Ortungstechnik
Measuring and Locating Technologies
Elektrizitätsnetze
Power Networks
Kommunikationsnetze
Communication Networks
Rohrleitungsnetze
Water Networks
Leitungsortung
Line Locating
Date of issue: 05 (01/2010) - EN

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  • Page 1 Operating Manual VLF Test System VLF CR−28 kV Mess- und Ortungstechnik Measuring and Locating Technologies Elektrizitätsnetze Power Networks Kommunikationsnetze Communication Networks Rohrleitungsnetze Water Networks Leitungsortung Line Locating Subject No.: 128312950 Date of issue: 05 (01/2010) - EN...
  • Page 2 2005/49 man_vlf_cr_28kv_en_05-4.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 Megger. All warranty claims versus Megger are hereby limited to a period of 12 months from the date of delivery. Each component supplied by Megger within the context of warranty will also be covered by this warranty for the remaining period of time but for 90 days at least.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS GENERAL INTRODUCTION ..........1-8 Safety Precautions ................. 1-9 1.1.1 General Safety Precautions ..............1-10 1.1.2 Supplementary Guidelines ..............1-11 1.1.3 Danger Due To Returning Voltage From Space Charge ....... 1-11 1.1.4 General Rules for Dealing with High Voltage ......... 1-13 TECHNICAL DESCRIPTION ..........
  • Page 6 ADDITIONAL FUNCTIONS ..........6-32 Adjustment of Language ..............6-32 Viewing the System Information ............6-32 Viewing / Setting the System Parameters .......... 6-33 Entering / Changing the Administrator Password ......6-34 Returning to the start menu ..............6-35 Optional Features ............... 7-36 Detection of Breakdown and Short Circuit ........
  • Page 7 INDEX OF FIGURES Fig 1: Representation of the test voltage characteristics (Device option Plus) 2-17 Fig 2: voltage waveform during polarity inversion ..........2-17 Fig 3: Operating module, Front View ............... 2-18 Fig 4: Display of the Operating module............2-19 Fig 5: Connections at the right hand side of the VLF Test System ....

  • Page 8: 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! Megger 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

    - At least two persons must be present whenever a high-voltage installation is in operation. The second person shall be able to recognise any risk and, in case of emergency, immediately actuate the emergency-shutdown. 1.1.2 Supplementary Guidelines The following guidelines which can not be directly derived from the instructions should be added to the above mentioned regulations.
  • Page 12 Attention! The HV module of the VLF Test System 28 kV contains electrical energy storage devices also. These devices are discharged in the same way like the test object by the internal discharging unit of the test device. To avoid the re-charging by space charges the HV module has to be immediately equipped by means of the provided shorting device (Fig 8) after disconnection of the both components HV module and Operating module.

  • Page 13: General Rules For Dealing With High Voltage

    1.1.4 General Rules for Dealing with High Voltage Dealing with high voltage and related equipment requires utmost care. This applies in particular to cases of non-stationary (mobile) operation, i.e. such instances where there is no special room which is permanently furnished with the appropriate safety equip- ment to provide for safety from the start.

  • Page 14: Technical Description

    TECHNICAL DESCRIPTION Technical Specification 2.1.1 VLF Test System 28 kV Output voltage, DC 2 ... 28 kV Output current source 12 mA Range of indication, Leakage current measurement 0 ... 12 mA Resolution of indication 10 µA Output voltage, VLF 2 ...

  • Page 15: Description Of The Vlf Test System

    Accessory equipment Mains connecting cable 2.5 m Earth connecting cable HV connecting cable Phase clip Terminal clip for earth connection Protection cover for operating module Instruction manual Equipment case OWTS connection cable (optional) Optional equipment Detection of breakdown Leakage current measurement Logging Printout (Protocol printing) OWTS mode...
  • Page 16 Subsequently, V1 initiates the desired inversion process through inductor L1. The test object changes its polarity from minus to plus. Depending on the capacitance of the connected test object, the ring-around time during polarity inversion is between 2 and 10 msec. Owing to the losses which occur in both the polarity inversion coil L1 and V1 during polarity inversion, the positive voltage is decreased by these losses.

  • Page 17: Fig 1: Representation Of The Test Voltage Characteristics (Device Option Plus)

    Fig 1 represents the generated characteristics of the test voltage in the case of the device option Basis. 25 kV 25 kV 20 s 22 kV 22 kV - 20 28 kV = 3 x U Nachladung Fig 1: Representation of the test voltage characteristics (Device option Plus) time Fig 2: voltage waveform during polarity inversion...

  • Page 18: Description Of Components Of The Vlf Test System 28 Kv

    Description of components of the VLF Test System 28 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 Key "HV Off"...

  • Page 19: Display Of The Operating Module

    2.3.2 Display of the Operating module Fig 4: Display of the Operating module 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; number 2) takes place according to following pattern: •...

  • Page 20: Vlf Test System As A Whole

    2.3.3 VLF Test System as a whole VLF Test System Operating 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 2-20 2005/49 man_vlf_cr_28kv_en_05-4.doc...

  • Page 21: Fig 6: Connectors On The Rear Of The Vlf Test System

    Hochspannung Fig 6: Connectors on the rear of the VLF Test System Test voltage output OWTS connector 2-21 2005/49 man_vlf_cr_28kv_en_05-4.doc...

  • Page 22: Protection Covers Of The Modules

    2.3.4 Protection covers of the modules Test System Fig 7: Protection cover of the Operating module (optional available also for HV-module) 2-22 2005/49 man_vlf_cr_28kv_en_05-4.doc...

  • Page 23: 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 24: 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 25 The VLF Test System 28 kV generates during the test process a dangerous test voltage up to 28 kV The test voltage is fed via the HV connecting cable in the test object. Protect the test object against unintentional contact of persons to active parts by means of protective devices (handrails, chains, bars, etc.) which guarantee that no one can get into the zone of danger.

  • Page 26: 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 discon- nected from it.

  • Page 27: 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 28: Fig 11: Selection Of The Test Voltage

    Now the user is able to choose the operation mode out of VLF and DC– mode by turn- ing the knob / push-button (Fig 3, item 6). The selection has to be confirmed by a singu- lar pressure on the knob / push-button (Fig 3, item 6). Now it is possible to select the test voltage level: VLF mode * 10kV...

  • Page 29: Sheath Fault Location (Sfl)

    Sheath Fault Location (SFL) 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 30 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 31 VLF mode 20kV F1:Print 15min F2:Setup Test time over Fig 16: 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 32: 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 33: 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 34: 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 35: 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 36: 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 37: 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 38 • Printout "Extended": - All information listed under “Standard” - Maximum test voltage, test voltage increase, step increment, rest pe- riod 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 39: 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 40: 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 41: 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 volt- age, leakage current) and the test result.
  • Page 42 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 43: 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 44: 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 45: Re-Setting The System Settings / Deleting The Print Templates

    Re-Setting the System Settings / Deleting the Print Tem- plates 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 tem- plates. After administrator rights have been gained as described in section 6.4, the “Memory”...

  • Page 46: 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 47: 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 48: 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 49: 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 50: 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 51 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 52 Code Operational message Description Input Set print mode In Setup: Prompting to rotary knob + OK make entry 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 set-...

  • Page 53: 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 54 Code Operational message Description Input 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 55: 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 56 Code Operational Description Input message State mismatch The slave is unable to Software trouble - must carry out the requested not occur during opera- transition of condition. tion Unknown master The software version of Insert Master Flash with the master is not com- appropriate software ver- patible with the software sion...
  • Page 57 Code Operational Description Input message HVon line error In the slave the so-called Check control line of re- HV contactor (module: lay K2 as well as hard- K2) is reported switched ware signal KISON on spite of being module locked Jumper changed Jumper coding of module Undo changes or make...

  • Page 58: Fig 15: Cable Test

    Code Operational Description Input message HV polarity + Polarity monitor in slave Check operation of HV reports wrong (positive) thyristors (ring-around polarity at HV measuring may have not taken divider. place) HV polarity - Polarity monitor in slave Check operation of HV reports wrong (negative) thyristors (ring-around polarity at HV measuring...
  • Page 59 Code Operational Description Input message Memory written Non-volatile device set- This is a receipt message tings have been reset to after "Reload setup" or their default values at the "Delete texts". time of delivery. Bad card param. Erroneous parameters Call parameters up to found on the system card display (also in Setup) have been reset to de-...
  • Page 60 Code Operational Description Input message No print data No data are availabe for Record protocol, data will built-in protocol printing. be available till next "HVon". Printer error The built-in protocol Check protocol printer printer is not ready for and its linkage as well as operation.
  • Page 61 The system cannot be Only for service: calibrated in the active Choose DC mode operation mode. Mainten. Maintenance is required Please make an ap- Required due to the high amount of pointment with your operating hours. nearest Megger serice station. 8-61 2005/49 man_vlf_cr_28kv_en_05-4.doc...
  • Page 63 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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