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Summary of Contents for Megger M-THUMP5-1000
- Page 1 M-THUMP5-1000-UG-EN-V01 May 2023 User Manual Portable Fault Locating System M-THUMP5-1000 Read this entire manual before operating. 400 Opportunity Way Phoenixville, PA 19460 U.S.A. 610-676-8500 www.megger.com...
- Page 3 Portable Fault Locating System M-THUMP5-1000 M9 version version...
- Page 4 Copyright© 2020 by 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.
- Page 5 F:+61 (0)2 9397 5911 F: 416 298 0848 Germany India Kingdom of Bahrain Megger Germany Megger (India) Pvt Limited P.O. Box 15777 Dr. Herbert Iann Str. 6 501 Crystal Paradise Mall Office 81, Building 298 96148 Baunach / Germany Off. Veera Desai Road...
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Page 7: Table Of Contents
Locating a Faulty Cable Segment (Sectionalizing) ..................Introduction ..............................How to Determine the Faulty Section ....................28 How to Verify Whether it is Actually a Bad Section ................30 Burning………………………………………………………………………………………… ………………..31 Determining the Breakdown Voltage of a faulted cable (proof testing) ........... 33 M-THUMP5-1000-UG-EN-V01 May 2023... - Page 8 How to Setup Customer-Specific TDR Features ..................58 How to Use EasyPROT Software to Plot DC HIPOT/Sheath Test Data ..........59 8 CARE and MAINTENANCE ......................... 60 Maintenance ................................Storage ..................................APPENDIX 1 ................................62 Overview of TDR Features ........................... M-THUMP5-1000-UG-EN-V01 May 2023...
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Page 9: Receiving Instructions
Service Representative or send to VFCustomerSupport@Megger.com. 2. Examine the equipment for damage received in transit. If damage is discovered, file a claim with the carrier at once and notify Megger, giving a detailed description of the damage. 3. Prior to operation, check for loosened hardware or damage incurred during transit. - Page 10 M-THUMP5-1000-UG-EN-V01 May 2023...
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Page 11: Safety
The user must consult the User Guide when this symbol marked on the instrument. PROTECTIVE EARTH TERMINAL NOTE: The notes contain important information and useful tips for using the system. Failure to observe them can render the measuring results useless. M-THUMP5-1000-UG-EN-V01... - Page 12 SAFETY M-THUMP5-1000-UG-EN-V01...
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Page 13: Working With The Product
Repair and Maintenance Repairs and service must only be done by Megger or Megger authorized service departments. Megger recommends having the equipment serviced and checked once per year at a Megger service location. -
Page 14: What To Do If Equipment Malfunctions
SAFETY allowed to operate Megger products in direct contact with humidity, water or near aggressive chemicals nor explosive gases and fumes. What to Do if Equipment Malfunctions The equipment shall only be used when working properly. If irregularities or malfunctions appear which cannot be solved consulting this manual, the equipment must immediately be put out of operation and marked as not functional. -
Page 15: Safety Advisory Note
(see also 1). 5. The resistance of the system grounding point of the power device to earth ground must be 5 Ohms or less when measured with an earth ground meter. M-THUMP5-1000-UG-EN-V01... - Page 16 SAFETY 6. If a 5 Ω or less condition cannot be attained, the operator must follow the specific work procedures and instructions, applicable to a “hot”/“energized”/“live” work site; in Europe EN 50110-1 is mandatory. M-THUMP5-1000-UG-EN-V01...
- Page 17 SAFETY M-THUMP5-1000-UG-EN-V01...
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Page 18: Technical Description
System Description Functional Description The M-THUMP5-1000 is a compact fault location system typically to be used for fault locating of LV and lower voltage MV power cables. It offers either a 120V or 230V AC power source to operate, which is connected in line with an internal isolation transformer to the AC shore power source. -
Page 19: Features
TECHNICAL DESCRIPTION Features The M-THUMP5-1000 system combines the following features and functions in a fully integrated, microcontroller and SW operated device: § Quick Steps, Expert Mode, and Manual TDR Mode, allowing to address 3 levels of user skill: Quick Steps and Expert Mode provide Automatic ARM fault Pre-location and Sectionalizing (latter requires optional SW, typically only for North American single phase MV circuit designs applicable). -
Page 20: Scope Of Delivery
TECHNICAL DESCRIPTION Scope of Delivery The scope of delivery of the M-THUMP5-1000 system comprises the following components: § HV output cable (hard wired) § Safety Ground cable (hard wired) § AC Power cord § Owner’s manual Available Accessories The following accessories* can be ordered from Megger, if required:... -
Page 21: Technical Data
TECHNICAL DESCRIPTION Technical Data M-THUMP5-1000-UG-EN-V01... - Page 22 506 x 794 x 356 mm / 20 x 32 x 15 in Weight 111lbs / 51kg, incl. 15ft / 3.5m HV cable and safety ground cable each Protection class (in accordance with IEC 61140) Protection rating IP53 (open lid) (in accordance with IEC 60529) M-THUMP5-1000-UG-EN-V01...
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Page 23: Control Elements, Indicators And Connectors
“HV ON” button “HV OFF” button Rotary control knob “ON / OFF” button USB port AC power connector ⓫ Safety ground connection Jack for connecting external safety device (See page 10 'Available Accessories'). Fuse Holders for AC input power M-THUMP5-1000-UG-EN-V01... -
Page 24: Power Supply
250VAC and is at least 17 AWG (1mm2). Do not use inadequately rated power cords! The M-THUMP5-1000 is equipped with an internal isolation transformer to protect against poor grounding conditions on the 230V supply side. -
Page 25: Setting Up The System
§ Always operate the M-THUMP5-1000 system in a vertical position. Grounding and HV contacts both require a vertical orientation to ensure proper functioning as well as a “Fail Safe Position” in case of an AC or DC power failure or if the unit needs to be shut off. -
Page 26: Connection Diagram
TDR trace readings will be much better! Connect the HV lead to the phase conductor to be tested (optional elbow adapter or vice-grip. (See 'Available Accessories' in Section 2). M-THUMP5-1000-UG-EN-V01... - Page 27 Connect the supplied power cord to the connector on the back of the unit and connect the other end to single phase 230V AC power. Only after all necessary connections have been made, the ground connection to the cable under test shall be lifted. M-THUMP5-1000-UG-EN-V01...
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Page 28: Operating Instructions
“UNIT CONFIGURATION”, in this case the displayed icons represent types of operation (in this example PRELOCATION) and by clicking on them display the individual modes Select the „Prelocation“ Icon, click, then select the specific method like „BurnLocate“ Basics of Operation M-THUMP5-1000-UG-EN-V01 May 2023... -
Page 29: Operation With Rotary Knob
The red illumina- ted “HV OFF” button signals that the HV output is now energized (hot) and the green button goes dark. Additionally the HV symbol is displayed in the upper left- hand corner of the screen M-THUMP5-1000-UG-EN-V01... -
Page 30: Safety Circuit
“HV OFF” button . The test is then immediately 2aborted and the high voltage power supply is turned off and the entire test circuit including the M-THUMP5-1000 is discharged and grounded, which is indicated by the illumination of the light in the green push button. -
Page 31: System Settings
Expert Mode. The default password is “0000” (can be changed – see below but is not recommended). After activation of the EXPERT MODE, the system settings icon is displayed, by clicking the scroll down system set up menu is available: M-THUMP5-1000-UG-EN-V01... -
Page 32: Default Settings
(NVP), e.g., 0.53 corresponds to 53% of speed of light V/2 (half of the actual velocity of propagation) in m/μs. >> Trigger delay NOTE: All M-THUMP5-1000 Models feature automatic Multishot time (Trigger delay time not applicable) >> TDR - Mode... - Page 33 Expert mode and Manual TDR mode). automatic NOTE: The factory DEFAULT for the M-THUMP5-1000 Unit is set to Manual Voltage Selection in order to avoid an automatic 5kV HV build-up, which might be unexpected by the operator if not familiar with this feature.
- Page 34 Procedure to adjust the start marker "zero“ position to the end of the actual length Marker of the HV output cable, for portable M-THUMP5-1000 at the end of the typical 50 (applicable for ft (15 m) HV output cable; for vehicle mounted units typically optional cable reels...
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Page 35: System Configuration
The duration of the Burn-Arm Locate application is limited to either 1, 2 or 3 Time out minutes, after which time the fault trace is automatically captured. However, the user can independently of the automatic capture initiate a manual capture at any time within the selected time window. M-THUMP5-1000-UG-EN-V01... - Page 36 Menu to configure the features which are available during measurement, for either Customize TDR QUICK-STEPS mode or EXPERT mode See page 43; not available for Manual features TDR Operation, please see page 22 By leaving the EXPERT MODE through this menu item, the new settings are Return saved. M-THUMP5-1000-UG-EN-V01...
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Page 37: How To Perform A Test
§ Determine the distance to the end of the cable or an open point in the circuit (blue trace, live trace) § Determine the distance to the fault using the ARM method (red trace, frozen) § Determine the number of transformers up to the fault & one beyond it M-THUMP5-1000-UG-EN-V01 May 2023... -
Page 38: How To Determine The Faulty Section
(not required in automatic mode). Press the green illuminated “HV ON” button Select to charge the surge capacitor (only if measurement start option is set to manual. See page 21). Result: The capacitor is charged up to the selected voltage. M-THUMP5-1000-UG-EN-V01... - Page 39 By closing in the NO (normal open point) all customers will have power. If necessary, adjust the display settings, TDR settings and marker position through the menu in order to uniquely identify the affected section. See page M-THUMP5-1000-UG-EN-V01...
- Page 40 (cut conductor or “burnt in the clear” condition in Aluminum conductor cables), needs to be confirmed with TDR measurement, if true cable end is visible cable has no fault, if true end cannot be verified by TDR cable is faulted M-THUMP5-1000-UG-EN-V01...
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Page 41: Burning
(see last paragraph above). Step Description Perform Burn and follow the steps listed below Connect safety ground of M-Thump5-1000 to system ground Connect HV Return to metallic shield of MV cable Connect HV output cable to cable to be fault located... - Page 42 Fault Locating Medium Voltage Shielded Cables Step Description Select voltage range based on previous Hipot / Break- down Test (≥ 1.1kV, 70mA) M-THUMP5-1000-UG-EN-V01...
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Page 43: Determining The Breakdown Voltage Of A Faulted Cable (Proof Testing)
Depending on whether a breakdown takes place during the test, one of the following results is presented in the display: Breakdown A voltage breakdown took place at the indicted test voltage, meaning there at…kV was a flash-over at the fault M-THUMP5-1000-UG-EN-V01... - Page 44 (some voltage and high current) The voltage indication must not be interpreted as a flash-over voltage, it is merely the voltage that the HVPS can build given the high leakage current. Select to proceed with fault pre-location or to return to the main menu. M-THUMP5-1000-UG-EN-V01...
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Page 45: How To Pre-Locate The Fault
“frozen” or “saved” LV trace). The cable end must be confirmed either by acknowledging the automatically sugges- ted number or by adjusting it manually; it serves as reference for any other distance measurement, without doing so, no distance measurement can be displayed! M-THUMP5-1000-UG-EN-V01... - Page 46 END MARKER icon in the feature menu. After adjusting the end marker to identify the cable end manually, click again and acknowledge the manually identified cable end. The SW requires a defined cable end as a reference; otherwise, no distances can be shown. Select to start fault trace (fault pre-location). M-THUMP5-1000-UG-EN-V01...
- Page 47 3 times, if results are very close, it can be assumed that this is the true fault location. If results differ, go to CURRENT DECOUPLING ICE prelocating and try to deter- mine fault location, see next page M-THUMP5-1000-UG-EN-V01...
- Page 48 ARC and the TDR pulse, but a large number of TDR pulses in very short repetition (every 256nsec), creating a high probability that one of the TDR pulses will see the flashover-arc at the time of its highest current or very close to it. M-THUMP5-1000-UG-EN-V01...
- Page 49 Principally the Burn ARM Prelocation method can be used on LV- and MV cables, either in a phase to phase, phase to concentric neutral or phase to armor configura- tion. The 5kV capability of the M-Thump5-1000 allows its application to all types of LV cables and MV circuits up to 6.6kV.
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Page 50: Current Decoupling (Ice)
40 Current Decoupling (ICE) The M-THUMP5-1000 SMART THUMP features the current decoupling method (ICE, Surge Pulse) as an alternative method to pre-locate high resistance -flashing- faults in shielded MV cables. It has proven very useful on very long (>5 mi/ 8 km) and or PILC cable fault situations, where the standard ARM pre-locating method sometimes fails to provide a concise and unambiguous distance to fault reading. - Page 51 (if possible) by selecting the icon. If necessary, adjust the display settings, TDR settings and marker position through the menu in order to identify the fault distance as precisely as possible. M-THUMP5-1000-UG-EN-V01...
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Page 52: How To Pinpoint A High Resistance (Flash-Over) Fault
„belted“ MV cable, between 2 phase conductors of a LV cable or between the phase conductor and earth ground or armor of a LV cable. The M-Thump5-1000 serves as surge pulse generator to continuously feed high voltage pulses into the defective cable, producing a flashover (arcing) at the fault position (high resistance fault). -
Page 53: Detecting A Sheath Fault In A Shielded Medium Voltage Cable
Consequently, the HV return lead must be connected directly to the system ground or separately driven ground rod (the safety ground of the M-Thump5-1000 must be bonded to the same ground point! M-THUMP5-1000-UG-EN-V01... - Page 54 … kV resistance fault (some voltage and high current) The voltage indication must not be interpreted as a flash-over voltage, it is merely the voltage that the HVPS can build given the high leakage current. M-THUMP5-1000-UG-EN-V01...
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Page 55: How To Pinpoint A Sheath Fault In A Shielded Medium Voltage Cable
The test method is based on the step voltage method (earth gradient method) and is performed with the M-Thump5-1000 as a HV pulse generator (limited to a max. voltage of 5 kV, see below). An additional receiver is required to read the strength and polarity of the earth gradient voltage (e.g.,... - Page 56 Fault Locating Medium Voltage Shielded Cables Step Description Pinpoint the sheath fault with an earth fault locator like the Megger ESG-NT. For detailed instructions, please refer to the user manual for the earth fault locator. Select to stop pulsing. M-THUMP5-1000-UG-EN-V01...
- Page 57 Below a link is attached, which provides access to an article on the methodology and field experience of LV fault locating 2023 - Transmission & Distribution Issue 1 2023 (zmags.com) M-THUMP5-1000-UG-EN-V01 May 2023...
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Page 58: Cables
5. If no flashover, the application of BURN-ARM Reflection can provide fault distance 6. For both 4. and 5. use surge / thump to pinpoint Phases 1-3, N=Neutral, AR= Armor (in this case armor was bonded to ground) Imedance change 29m M-THUMP5-1000-UG-EN-V01... -
Page 59: Introduction
(see page 22). During the live operation of the TDR the user can always override any default value by choosing his or her own value, the changed value will be returned to the default setting after the next re-boot. M-THUMP5-1000-UG-EN-V01... -
Page 60: Menu Item Description
Allows the manual adjustment of the blue end marker. At first, a coarse adjustment is made and confirmed by pressing the rotary Adjust the End knob once - subsequently, the position can be fine-tuned. Marker M-THUMP5-1000-UG-EN-V01... - Page 61 Displays the selected trace on the screen. The screen view can then be adjusted using any function which does not require the trace to be updated. By selecting , the loaded trace is closed, and the last recorded trace is displayed again. M-THUMP5-1000-UG-EN-V01...
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Page 62: Completing The Operation
Do not undo and or remove grounding and shorting measures until the time when the test object is put into operation again. M-THUMP5-1000-UG-EN-V01... -
Page 63: Advanced System Settings
<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> </cable> </cablelist> While the bolded parts must not be changed, there can be an arbitrary number of <cable> elements placed one after another each presenting a cable type. M-THUMP5-1000-UG-EN-V01 May 2023... -
Page 64: Step Action
Save the new cable list in the CableLists folder of the USB drive. Import the new cable list into the unit. See page 24. Set the new cable list as default cable list. See page 24. How to Setup Customer-Specific TDR Features M-THUMP5-1000-UG-EN-V01... -
Page 65: How To Use Easyprot Software To Plot Dc Hipot/Sheath Test Data
ADVANCED SYSTEM SETTINGS Thanks to the high level of configurability of the M-Thump5-1000, the TDR features for both, "EXPERT MODE" and "QUICK STEPS MODE", (see page 20) are individually customer configurable. In order to create your own customer-specific settings, proceed as follows:... - Page 66 ADVANCED SYSTEM SETTINGS The M-THUMP5-1000 allows recording and graphing of DC test data, either DC HIPOT test data or Sheath test 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.
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Page 67: Care And Maintenance
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 the unit at a full state-of-charge. Apply topping charge every six months. M-THUMP5-1000-UG-EN-V01 May 2023... - Page 68 MAINTENANCE M-THUMP5-1000-UG-EN-V01...
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Page 69: Overview Of Tdr Features
Expert: enabled Save trace (option to save the current QUICK STEPS: enabled trace) Expert: enabled Save Fulltrace to USB (service only) Zoom In/Out (option to zoom the trace QUICK STEPS: enabled in and out) Expert: enabled M-THUMP5-1000-UG-EN-V01 May 2023...
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