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How to Perform a Test

AVTMST16 Rev 1 May 2016

25

Locating a Cable Fault (shielded MV power cable)

How to Test the Dielectric Strength of the Cable

A HIPOT/breakdown test is used to test the dielectric strength of a cable and, if
the test fails, to determine the breakdown voltage. For this purpose, a test
voltage of up to 16 kV is applied to the cable under test.

Proceed as follows to perform a HIPOT test:

Step Description

1

Select the

menu item from the main menu or from the

submenu (depends on the

system configuration).

2

Adjust the test voltage and select

to confirm the value.

3

Press the green illuminated “HV ON" button

.

4

Select

to start the test (only if

Measurement Start

option is set to

Manual

.

See section

“System Settings” on page 17).

Result:

The selected voltage is applied to the cable.

During the rise of the voltage the maximum current of the HVPS will be displayed till the
cable has been fully charged, at which time the current will drop down to the actual leakage
current level. The insulation resistance is displayed. This scenario is observed if the cable
has no insulation breakdown, otherwise the high voltage will be shut off when the flashover
/ breakdown occurs.

Depending on whether a breakdown takes place during the test, one of the following
results is presented in the display:

Breakdown
at…kV

A voltage breakdown took place at the indicted test voltage.

No Flash-over

The cable has successfully withstood the applied DC test voltage. If

required, repeat (

) the test with higher voltage (do not exceed the

maximum permissible voltage).

Cable not
chargeable

The cable could not be charged while the test voltage was applied. This
may be due to a short on the cable.

Low
resistance at
…kV

The HV source cannot charge the cable beyond the indicated voltage
value due to a very high leakage current level.

5

Select

to proceed with fault pre-location or

to return to the main menu.

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Содержание SMART THUMP ST16

Страница 1: ...ay 2016 User Manual Portable Fault Locating System SMART THUMP ST16 Read this entire manual before operating M Valley Forge Corporate Center 2621 Van Buren Avenue Norristown PA 19403 2329 U S A 610 676 8500 www megger com ...

Страница 2: ...M ...

Страница 3: ...Portable Fault Locating System SMART THUMP ST16 User Manual ...

Страница 4: ...efer to the warranty information below Specifications are subject to change without notice WARRANTY Products supplied by Megger are warranted against defects in material and workmanship for a period of one year following shipment Our liability is specifically limited to replacing or repairing at our option defective equipment Equipment returned for repair must be shipped prepaid and insured Contac...

Страница 5: ... 973 177 20 975 mesales megger com Kingdom of Saudi Arabia South Africa Sweden PO Box 1168 Khobar 31952 T 966 3889 4407 F 966 3889 4077 mesales megger com PO Box 22300 Glen Ashley 4022 Durban South Africa T 27 031 5646578 F 27 031 5637990 Megger Sweden AB Eldarvägen 4 Box 2970 SE 187 29 TÄBY SWEDEN T 46 8 510 195 00 F 46 8 510 195 95 Switzerland United Kingdom Dover Megger Schweiz AG Ob Haselweg 6...

Страница 6: ...M M ...

Страница 7: ...ption 5 Product Models 5 Features 6 Scope of Delivery 6 Available Accessories 7 Technical Data 7 Control Elements Indicators and Connectors 9 Power Supply 11 Battery Operation 11 AC Line Operation 12 3 SETTING UP THE SYSTEM 13 Connection Diagram 14 Connection Sequence 14 4 OPERATING INSTRUCTIONS 15 Power on the System 15 Basics of Operation 15 Operation with Rotary Knob 15 High Voltage Control 16 ...

Страница 8: ... directly buried 32 How to Pinpoint a Sheath Fault OR a Ground Fault in an Unshielded Low Voltage Cable both must be directly buried 34 6 CUSTOMIZE TDR FEATURES applicable to TDR and ARM Mode 37 Introduction 37 Customized TDR Features 38 Completing the Operation 41 7 ADVANCED SYSTEM SETTINGS 43 How to Edit the Cable List 43 Introduction 43 XML Structure of a Cable List File 43 How to Edit the Cabl...

Страница 9: ... attempt to operate equipment Please contact Megger as soon as possible Please check your delivery against a your order b our advice note c the item delivered and d the parts list any shortages must be reported immediately Consultation with Megger The present system manual has been designed as an operating guide and for reference It is meant to answer your questions and solve your problems in as f...

Страница 10: ...M AVTMST16 Rev 1 May 2016 iv M ...

Страница 11: ...in this handbook Locally applying regulations have to be observed Warning and Caution Notices Warning and caution notices are used throughout this manual where applicable These notices appear in the format shown below and are defined as follows F WARNING Warning as used in this manual is defined as a condition or practice which could result in personal injury or loss of life G CAUTION Caution as u...

Страница 12: ... VDE 0104 EN 50191 DIN VDE 0105 EN 50110 and the German accident prevention regulations UVV define an electrician as someone whose knowledge experience and familiarity with the applicable regulations enables him to recognize potential hazards Repair and Maintenance Repairs and service must only be done by Megger or authorized service departments of Megger Megger recommends having the equipment ser...

Страница 13: ...ysical processes during operation of high voltage may endanger persons wearing a cardiac pacemaker when near these high voltage facilities Fire fighting in electrical installations According to regulations Carbon Dioxide CO2 is required to be used as extinguishing agent for fighting fire in electrical installations Carbon Dioxide is electrically non conductive and does not leave residues It is saf...

Страница 14: ...e corresponding EN 50191 as well as country specific regulations and standards must be observed The system generates a dangerous voltage of up to 16 kV during operation This is supplied via a HV cable to the test object The system may not be operated without supervision Safety installations may not be by passed nor deactivated All metallic parts in close proximity of the test equipment must be gro...

Страница 15: ...d 1500 J surge generator as well as DC for breakdown detection insulation resistance estimation and sheath testing and sheath locating sheath locating requires optional receiver ESG NT Product Models Typically the SMART THUMP is mounted on a hand truck and equipped with a lead acid battery inverter system The hand truck mounted version is also available as an AC unit only without battery inverter ...

Страница 16: ...wn detection and insulation resistance measurement Pinpointing of high resistance faults in surge mode Sheath test with automatic breakdown detection Sheath fault pinpointing requires optional receiver ESG NT Integrated safety circuit for user s safety F OHM safe grounding Optional external remotely operated safety device to shut off HV Operation from internal battery inverter or from an external ...

Страница 17: ... 8 to16 kV Source current 0 to 60 mA up to 8 kV 0 to 30 mA 8 16 kV Insulation measurement 20 kΩ 10 MΩ Surge energy 1500 J at the maximum surge voltage of the respective surge levels 8 kV 16 kV Power supply 110 V to 230 V 15 50 60 Hz Battery Internal lead acid gel type battery 12 V 74 Ah Operating time battery 90 min pinpointing Power consumption 700 W Display 640 x 480 pixel Transflective high Bri...

Страница 18: ...C to 70 C Dimensions W x H x D 690 x 1165 x 600 mm Weight 145 kg hand truck mounted incl battery inverter and 50ft 17m each of HV and Safety Ground cable Protection class in accordance with IEC 61140 I Protection rating in accordance with IEC 60529 IP53 ...

Страница 19: ...TECHNICAL DESCRIPTION AVTMST16 Rev 1 May 2016 9 Control Elements Indicators and Connectors The SMART THUMP has the following control elements indictors and connectors ...

Страница 20: ...itch HV ON button HV OFF button Rotary control knob ON OFF button USB port Charging status LED yellow charging green charging completed AC power connector Safety ground connection Jack for connecting external safety device See page 7 Available Accessories Terminals for external 12 V DC power supply ...

Страница 21: ... available no battery icon is shown on the screen As soon as the battery is discharged by more than 50 the battery icon in the upper right corner of the screen starts flashing not an active bar graph Battery capacity 50 Battery capacity 50 To protect the battery from a deep discharge the unit turns automatically off if the battery is discharged too low for safe operation Note To find out whether t...

Страница 22: ...rs The progress of the charging process is indicated by the battery charging status LED During charging the LED lights yellow It turns to green when the battery is full and charging is finished NOTE Always charge the battery immediately after use Lead acid batteries must always be kept in a charged condition The battery life is longer with an almost fully charged battery rather than fully discharg...

Страница 23: ...f to the side of the cable path never on top of the cable path When setting up the testing system ensure that it does not impair the function of any other systems or components If other systems and components have to be modified in order to set up and operate the test system be sure to reverse these actions when the work is finished Always take the special requirements of these systems and compone...

Страница 24: ...vating the HV OFF function NOTE The closer and better the HV return is connected to the shield concentric of the cable to be tested the better the TDR trace readings will be Connect the HV lead to the phase conductor to be tested optional elbow adapter or vice grip See Available Accessories in Section 2 Connect the supplied power cord to the connector on the back of the unit and connect the other ...

Страница 25: ... for operation state and the main menu is displayed In this state the high voltage source is still switched off and the high voltage output is grounded via a discharge resistor Basics of Operation Operation with Rotary Knob Navigation within the menus is done using the rotary knob as follows Turning Selecting Clicking Confirming ENTER function SMART THUMP 16 1500 Test ...

Страница 26: ...ized hot and the green button goes dark The activation of high voltage requires that all conditions of the safety circuit are met See page 16 in Section Safety Circuit The high voltage can be switched off at any time during the course of the test by pushing the HV OFF button The test is then immediately aborted and the system is placed in the Ready for operation state The high voltage power supply...

Страница 27: ...disabled because of one or more of these conditions are not being met they must be eliminated and the message must be acknowledged before HV ON can be enabled User Modes The E TRAY system platform offers two operational modes to the operator which are fully customer configurable QUICK STEPS mode This mode is tailored for the everyday jobs where the basic settings may need no or just minor adjustme...

Страница 28: ...Meter Feet or Time If set to Time the actual runtime of the pulse is displayed and no conversion to length of cable is performed Rate Only available if Length is set to Meter or Feet Rate refers to how the propagation velocity of the TDR pulse is specified This can be done either relative to the speed of light of NVP or in absolute units in μs μsec microseconds 10 6 sec V 2 or NVP Only available i...

Страница 29: ...an be performed for up to 30 minutes and the data can be exported via USB stick and loaded on the EasyPROT software 3 Must be enabled to perform Sheath Tests Set up Start Marker Procedure to adjust the start marker position to the end of the actual length of the HV output cable typically on SMART THUMP at the end of the 50ft 17m HV out put cable The procedure is fully automatic and the operator is...

Страница 30: ...ty after which the system is automatically shut down Stored Traces Menu item to export or delete all traces which have been stored in the internal memory Exporting traces requires a USB flash drive plugged into the USB port The traces are written into the EtrayTraces folder which is automatically created The data can be viewed in any regular web browser by opening the index html file which is also...

Страница 31: ...ed by a sudden discharge of the charged capacitor at the fault location This reflection is negative With both traces lying on top of each other the fault location position where the two traces diverge from each other is identified and the transformers reflections provide the landmarks to identify the faulted cable segment It will be switched out by pulling the elbows to the left and right side of ...

Страница 32: ...ge is processed by the transformer identification software After a few seconds the reference trace which shows the distance to the cable end and in addition the approximate distance to each transformer is presented in the display This reference trace is also called live trace as it is permanently refreshed 2 Compare the indicated transformers with the actual plans of the cable system If necessary ...

Страница 33: ...ed in automatic mode See page 18 Result A capacitor discharge shot is initiated If a voltage breakdown takes place the red fault trace is shown in the display The red fault marker is automatically set to the position where both traces diverge from each other The fault is referenced to the 2 closest transformers which identify the cable section containing the fault NOTE If no trigger is received an...

Страница 34: ...m current of the HVPS will be displayed till the cable has been fully charged at which time the current will drop down to the actual leakage current level The insulation resistance is displayed This scenario is observed if the cable has no insulation breakdown otherwise the high voltage will be shut off when the flashover breakdown occurs Depending on whether or not a breakdown takes place during ...

Страница 35: ...t of the HVPS will be displayed till the cable has been fully charged at which time the current will drop down to the actual leakage current level The insulation resistance is displayed This scenario is observed if the cable has no insulation breakdown otherwise the high voltage will be shut off when the flashover breakdown occurs Depending on whether a breakdown takes place during the test one of...

Страница 36: ... 1 Select the menu item from the main menu or from the submenu depends on the system configuration Result A LV pulse is fed into the cable The reflection image with the determined distance to the cable end is presented in the display This reference trace is also called live trace as it is permanently refreshed blue color a black color trace indicates a frozen or saved LV trace Note The software pr...

Страница 37: ...tivating the END MARKER icon in the feature menu After adjustment to identify the cable end manually click again and acknowledge the manually identified cable end 2 Select to start the fault pre location 3 If required the surge voltage can be adjusted through the menu item Otherwise the maximum surge voltage is automatically used if default AUTOMATIC VOLTAGE CONTROL 4 Press the green illuminated H...

Страница 38: ...f no trigger is received no fault trace red is shown Repeat the procedure with a higher surge voltage if possible by selecting the menu item If the blue trace TDR trace and the red trace are either 100 matching or following each other very closely the trigger has been activated however no breakdown flashover was detected increase voltage or possibly good cable 7 If necessary adjust the display set...

Страница 39: ...includes length of HV output cable deduct this length to get the distance to the fault going forward from the connection point e g transformer switchgear etc Proceed as follows to pre locate the cable fault Step Description 1 Select the menu item from the main menu or from the submenu depends on the system configuration 2 Adjust the surge voltage and select to confirm the value 3 Press the green i...

Страница 40: ...dentify the fault distance as precisely as possible See page 38 7 Go into the simple options menu in order to measure out the distance Use the cursor to select one peak first Drop a marker at the cursor position and move the cursor to the next peak The distance between the cursor and the marker is given on the screen 8 Select to return to the main menu ...

Страница 41: ... sound where it is not the loudest sound but the first after receiving the magnetic signal The latter one is more accurate and can be used in all high resistance fault situations e g Megger Digiphone Plus and even for locating faults in conduit Proceed as follows to pinpoint the fault Step Description 1 Select the menu item from the main menu or from the submenu depends on the system configuration...

Страница 42: ...ound or a separately driven ground rod Fault locating on unshielded direct buried low voltage cables must be carried out in the sheath fault locating mode in order to ensure that the maximum voltage is limited to 5kV in this case the HV out put cable is connected to the center conductor and the HV return to a driven ground rod The insulation of any high or medium voltage shielded power cable is pr...

Страница 43: ...ble has no insulation breakdown otherwise the high voltage will be shut off when the flashover breakdown occurs Depending on whether a breakdown takes place during the test one of the following results is presented in the display Breakdown at kV A voltage breakdown took place at the indicted test voltage No Flash over The cable jacket has successfully withstood the applied DC test voltage You can ...

Страница 44: ...r ESG NT in order to pinpoint the sheath fault When approaching the fault position the step voltage increases quickly and decreases to a zero reading directly over the fault and then will swing to a strong voltage of the opposite polarity Proceed as follows to pinpoint the sheath fault Step Description 1 Select the menu item from the submenu 2 Confirm the following two notices with 3 Adjust the su...

Страница 45: ...sed voltage signal into the cable This process is then repeated until the process is manually stopped If required you can adjust the pulse voltage by selecting the menu item 6 Pinpoint the sheath fault with an earth fault locator like the Megger ESG NT For detailed instructions please refer to the user manual of the earth fault locator 7 Select to stop pulsing ...

Страница 46: ...M AVTMST16 Rev 1 May 2016 36 M ...

Страница 47: ...ns are placed along the bottom of the screen Extended options are available from a scroll down sub menu NOTE The selection of available features depends on the system configuration and the active user mode All TDR features are configurable by the customer to best fit his requirements in both Quick Steps mode and Expert Mode In general the majority of features listed will be made available when wor...

Страница 48: ...nual adjustment of the velocity of propagation While changing the velocity the distance values X axis scaling are immediately refreshed and adapted This menu option is only effective if the Rate parameter is set to Meter or Feet See page 18 You may either manually adjust the value or automatically adopt the value by identifying selecting a cable from the cable list See page 19 Set Move Cursor Chan...

Страница 49: ...sed every time the marker is placed on a new position Save Current Trace Saves the current screen view to the internal memory Export Recall or Delete Stored Traces Enables you to export recall and delete stored data from internal memory By selecting All traces you can delete or export all traces which are currently stored in the internal memory In case you want to select a specific trace you need ...

Страница 50: ...arrow pulses lead to short ranges but at very high resolution Wide pulses which provide lower resolution have to be used when measuring on long cables With an adjustment of the pulse width the fault trace if present is erased and a new live trace is immediately recorded Change transformer sensitivity Only applicable in combination with the sectionalizing software Allows manual adjustment of the tr...

Страница 51: ... disconnected from the test object in accordance with the safety instructions below F WARNING Follow the five safety rules described on page 3 Even if proper disconnection and discharging has taken place system components which have been under voltage must only be touched if they have been visibly shorted and grounded before hand Do not undo and or remove grounding and shorting measures until the ...

Страница 52: ...M AVTMST16 Rev 1 May 2016 42 M ...

Страница 53: ...ws the XML structure of a cable list xml version 1 0 encoding utf 8 cablelist name Default version 1 tabledef column attrName TYPE TYPE column column attrName MILS MILS column column attrName KV KV column column attrName GAUGE GAUGE column tabledef cable attr name TYPE EPR attr attr name MILS 220 attr attr name KV 15 attr attr name GAUGE 4 0 attr velocity value 286 value unit feet µs unit velocity...

Страница 54: ...e lists requires basic knowledge of the Extensible Markup Language XML standards By altering the structure of the XML file during edit the cable list would be rendered unreadable and useless Proceed as follows to adapt the list to your needs Step Action 1 Export the standard cable list to a USB flash drive see page 19 2 Open the XML document using a text editor with XML syntax highlighting e g Not...

Страница 55: ...CK STEPS mode If you want to change the options of the EXPERT MODE select the QUICK STEPS menu item select the Expert menu item 6 Select the option you want to activate deactivate An overview table of all options can be found in appendix 1 7 Select one of the available options by rotating the rotary knob Disabled The option is not available in the selected user mode Simple The option is available ...

Страница 56: ...M AVTMST16 Rev 1 May 2016 46 ...

Страница 57: ...est data Before switching the ST16 on insert USB drive into front panel Then start the unit and conduct the particular test After the test is finished operator will be asked if he or she wants to export data By clicking yes a csv data set is written to the USB drive It can be downloaded on to a laptop which has the EasyPROT software installed The EasyPROT software is available as an option for all...

Страница 58: ...M AVTMST16 Rev 1 May 2016 48 M ...

Страница 59: ...s must be tested according to all applying standards international national and company own Keep connectors and connections clean Storage If not in use the system should be stored in a dust free and dry environment Humidity condensation by itself or in combination with dust can reduce critical distances within the equipment which are necessary to maintain safe high voltage performance Always store...

Страница 60: ...M AVTMST16 Rev 1 May 2016 50 M ...

Страница 61: ...AVTMST16 Rev 1 May 2016 51 Appendix 1 Overview of TDR Features See next page for complete chart ...

Страница 62: ... service purposes only Search for Xfmr option to start a transformer search QUICK STEPS disabled Expert simple Gain option to adjust the gain setting QUICK STEPS disabled Expert simple Put Trace on hold option to put live trace on hold QUICK STEPS disabled Expert simple Adjust End Marker option to adjust the end marker QUICK STEPS disabled Expert simple Adjust Start Marker option to adjust the sta...

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