Metrotech 9800XT SFL2 Series Manuel utilisateur
9800XT™ SFL2
SERVICE CENTER, SALES AND TECHNICAL SUPPORT INFORMATION
Corporate Headquarters Metrotech Eastern U.S. Service Center Metrotech European Service Center
3251 Olcott Street 1824 Murfreesboro Road, Ste. 104 Seba KMT
Santa Clara, CA 95054 Nashville, TN 37217 Dr. Herbert Iann St. 6
800-446-3392 800-624-6210 96148 Baunach, Germany
408-734-1400 Direct 615-366-7323 Direct +49 9544 680
408-734-1415 Fax 615-360-9855 Fax +49 9544 2273 Fax
www.metrotech.com nashville@metrotech.com service@sebakmt.com
sales@metrotech.com
Warranty: One year. Specifications Subject to change without notice, ISO 9001:2000 Certified. Copyright 2008. All Rights Reserved. Rev 12/01/07
OPERATIONS MANUAL
Sheath Fault Locator
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ISO 9001 CERTIFIED
Metrotech has received ISO 9001 Quality Management System Certification.
Metrotech adheres to the quality standard guidelines of ISO 9001 and ensures
quality in its design/development, production, installation, and servicing
disciplines.
© Metrotech Corporation 2005-2008
Metrotech Corporation
3251 Olcott Street
Santa Clara, CA 95054
USA
Tel: 1.800.446.3392; 1.408.734.1400
Fax: 1.408.734.1415
Internet: www.metrotech.com
Revision C: 12/1/07
TABLE OF CONTENTS
List of Illustrations ………………………………………………………. .1
1 Introduction…….……..………………………….…………………………. 2
2 Safety Precautions………………………………………………………… ..3
3 9800XT SFL-2 Quick Start Guide for the Experienced User………. .4
4 9800XT SFL-2 Equipment………………………………………..….….. .10
4.1 Standard Equipment……………………………………….. .. .….….10
4.2 Optional Accessories…………………………………….. .. .…. . ….12
4.3 Technical Specifications…………………………………….. … …...13
4.4 Transmitter Controls and Indicators…………………………….……16
4.5 Transmitter Features………………………………………………….18
4.6 A-Frame Receiver Controls and Indicators…………………………..20
4.7 Additional A-Frame Receiver Features………………………………21
5 Principles of Operation…………………………………………………….22
5.1 Functional Theory…………………………………………………...22
5.1.1 Earth Voltage Gradient…………………. …………………………24
5.1.2 Equipotentials……………..………………………………………..24
5.1.3 Multiple Fault Patterns………………………………………..……26
5.1.4 Distortion Due to Adjacent Conductors……………………………26
6 Checkout Procedure……..…….. . ………………………. … .. .…. … ... 27
7 Operation…….…..…………………………………………………….…....29
7.1 Check the Batteries Prior to Going into the Field…… . . . . . . . . . …29
7.2 Ensure all conductors are de-energized.…………… . . . . . . .. .……29
7.3 Lift the Grounds………………. . . . .……………………………. ..29
7.4 Attach the Transmitter to the Conductor-Check Fault Resistance . . 29
7.5 Synchronize the A-Frame Receiver…. .…………………………….30
7.6 Confirm that a Fault Exists…………. . . . . .………………………..32
7.7 Trace the Cable with the 9800 Receiver…. . . . . . . .………………..32
7.8 Pinpoint the Fault…………….. …………………………. .……….32
7.9 Verify the Fault……………. . . .……. .. ..……………………….…32
8 Advanced Techniques…...….………………………………….…...……..33
8.1 Faults Under Inaccessible Surfaces…. . . . .………………………...33
8.1.1 Perpendicular Method………………………………………..……..33
8.1.2 Triangulation Method………….. .………………………… ………34
8.2 Faults Under Pavement…. ...……………………………… ……..35
8.3 Long Distance Tracing……. . . . . . .………… .. …… ……………35
8.4 High and Low Impedance Faults…. . . . . . . . . . . . . . ……………..36
8.5 Multiple Faults……. . . . . . . . .…………………………………. . .36
9 Maintenance…………………………………………………………… … ...37
9.1 Receiver Battery Replacement……… .. . . . . . . . . . . . . .. . ………37
9.2 Service Center………………………………… . . . . . . . . . .. .. ….38
Appendix ………………………………………………………………….. . ....39
Copyright…………………………………………………………………… ....40
Warranty……………………………………………………………….. .. … ...41
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LIST OF ILLUSTRATIONS
Figure 3-1: Fault Resistance Scale.. . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . . ..4
Figure 3-2: Clamping Black Lead to Ground Rod…..…….. ………………...5
Figure 3-3: Clamping Red Lead to Targeted Cable.………………………. ...5
Figure 3-4: Locating the Targeted Cable…………..………………. .… …… 5
Figure 3-5: Positioning of A-Frame Receiver for Synchronization………….6
Figure 3-6: Locating the Cable Fault with A-Frame Receiver…….………. .7
Figure 4-1: Standard Equipment and Accessories. . …… . . . . . . . . . . . . . . .. 11
Figure 4-2: Transmitter Controls Panel….……..…………… ……………….16
Figure 4-3: A-Frame Controls and Indicators. . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 5-1: Typical SFL-2 Transmitter Connection………………………… 23
Figure 5-2: Signal Pattern Around Fault and Ground Point……………..… 24
Figure 5-3: Multiple Fault Signal Patterns………………………………….. 26
Figure 6-1: Checkout Test Set-Up…………………………………….……… 27
Figure 7-1: Synchronizing the A-frame……………………………………….30
Figure 7-2: Fault Confirmation………………………………………………. 31
Figure 8-1: Perpendicular Method…………………………………………… 33
Figure 8-2: Triangulation Method…………………………………………… 34
Figure 8-3: Locating an Equipotential Circle……………………………….. 34
Figure 8-4: Fault Location Using Extension Cable for
Increased Sensitivity…………………………………………….. 35
Figure 9-1: Receiver Battery Replacement………………………………….. 37
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1INTRODUCTION
The Metrotech 9800SFL Sheath Fault Locator system is designed to detect and pinpoint
sheath and other conductor faults that are in direct contact with the earth.
The 9800SFL offers these unique features:
♦ Fault level measurement at the Transmitter
♦ Simultaneous fault finding and line tracing.
♦ Signal strength LCD on the A-Frame for judging proximity to
faults, comparing multiple faults, and detecting pinholes and
“trees” in power cable.
♦ Detection of low and high resistance faults.
♦ Automatic battery checking and low battery warning
♦ Non-polarized A-Frame.
♦ Single-handed operation. No need to carry locator receiver as well
as A-frame.
Operation of the unit is completely automatic; there are no operator adjustments required.
Both the Transmitter and Receiver are water resistant and built to withstand the rigors of
field use.
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2 SAFETY PRECAUTIONS
1 Metrotech Utility Line and Sheath Fault Locators are intended for use by utility
and contractor professionals. Safety hazards for underground utility access
areas include electrical shock, explosive gases, and toxic fumes as well as
potential influence on communications and control systems such as traffic control
and railroad crossings.
2 Familiarize yourself with all required safety practices of the local utility company,
or other owner of the plant before entering an access area or connecting a
Metrotech transmitter.
3 Before connecting transmitter directly to any conductor, make sure that the
line is de-energized and out of service. Never make a direct connection to a
live power cable.
4 If you use the Metroclamp on energized electrical or control lines follow
appropriate safety procedures to avoid the risk of injury.
5 Pay special attention when using a locator in high traffic areas.
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3 9800XT SFL-2 SHEATH FAULT LOCATOR QUICK START
FOR THE EXPERIENCED USER
1 Check Batteries Prior to Departing for the Field
Check the batteries in the Transmitter, Receiver, and A-Frame.
Replace/recharge if necessary. Turn the instruments off.
2 Ensure all conductors are de-energized
3 Lift Grounds
Lift Grounds (of all conductors in the circuit) at both ends of the faulted cable
section.
WARNING
When the Transmitter is set to “SFL”, the external OUTPUT JACKS produce
High Voltage. Do not touch these jacks, electrical shock will result!
4 Attach Transmitter to Conductor – Check Fault Resistance
1 Turn Transmitter “OFF.”
2 Plug Black and Red leads into the Transmitter.
3 Stretch Black-lead 180 degrees away from conductor.
4 Push grounding rod into earth and clamp black lead to grounding rod.
Establish the best ground possible. See figure 3-2
5 Clamp Red lead to target conductor sheath. See Figure 3-3
6 Turn Transmitter power knob to “SFL” position.
Check fault resistance scale: See Figure 3-1
0-100k ohms – Severe Fault
100k – 500k ohms – Medium Fault
1 Megohm and above – Light Faults
Note: Read the number below the oscillating
bar to check the quality of the targeted
cable. The fault resistance on
Figure 3-1 is 10K ohms (Severe Fault).
Figure 3-1: Fault Resistance Scale
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Figure 3-2: Clamping Black Lead to Ground Rod
Figure 3-3: Clamping Red Lead to Conductor
5 Use the 9800XT Line Locator Receiver to Trace the Cable
Trace and mark the cable as you proceed towards the fault.
Figure 3-4: Locating the Targeted Cable
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5 Synchronize the A-Frame Receiver and establish reference value of fault
(A-Frame receiver has a one-color band above each spike (Black or White)
1 Hold the A-Frame Receiver so the spike with the black band is about 2 steps
away from the ground rod and the spike with the white band is in-line with the
targeted cable. The A-frame receiver must be placed as shown in figure 3-5
for synchronization and for unit to operate correctly. Push the A-Frame spikes
into the ground. Switch the Receiver “ON” wait until arrow flashes.
Figure 3-5: Positioning of A-Frame Receiver for Synchronization
2 Monitor bar-graph LCD display for arrow direction. If the arrow points
away from the ground rod, there is a fault.
3 If the arrow points towards the ground rod, there is no fault, and
grounds and connections need to be rechecked
4 The number of bars on the LCD indicates the potential gradient
associated with the fault at the synchronization location.
5 The number of bars will decrease when you move away from the
synchronization location and will increase when you get closer to the
targeted fault. See Figure 3-6.
Ce manuel convient aux modèles suivants
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