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Aqua-Tronics EG 3000 Instruction Manual

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EG 3000
Earth Gradient
Cable Fault
Locator
EG 3000 T
Includes
Cable Locating
with Automatic
Impedance
Matching
EG 3000 | EG 3000T
INSTRUCTION MANUAL
To Locate All Unshielded Cable Faults and
Sheath-to-Ground Faults
Plus:
• Cable Tracing
-Direct
-Inductive
-Inductive Coupler
U.S. Patents #4,697,137
and #4,233,561

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Summary of Contents for Aqua-Tronics EG 3000

  • Page 1 EG 3000 | EG 3000T INSTRUCTION MANUAL EG 3000 Earth Gradient Cable Fault Locator EG 3000 T Includes Cable Locating with Automatic Impedance Matching To Locate All Unshielded Cable Faults and Sheath-to-Ground Faults Plus: • Cable Tracing -Direct -Inductive -Inductive Coupler U.S.

  • Page 3: Table Of Contents

    Description Of The EG 3000ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ...
  • Page 4 WHEN TO USE EARTH GRADIENT FAULT LOCATING Earth gradient techniques can only be used on "unshielded, insulated” cables and can only locate a "short" or "nonlinear" fault. sHoRt A short occurs when direct metallic contact has been made between two or more conductors, such as a phase-to-phase, phase-to-neutral, or phase-to-ground.

  • Page 5: Earth Gradient Fault Locating Processˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ

    10 to 20 feet past to verify that the operator has indeed gone past the fault. A reverse pulse on the indicator should be present. (See Figure 1) DESCRIPTION OF THE EG 3000 tRansMItteR The transmitter produces a negative square wave pulse into the faulted cable. This pulse will be approximately 1/2 second long, every 4 seconds.
  • Page 6 DesCRIPtIon of tHe eG 3000 (Continued) The fault resistance can change during the fault locating process. For example, soil can dry out and raise the fault resistance level because of the fault current present from the transmitter, or rain can moisten the soil and reduce the fault resistance level. Regardless of the conditions, the transmitter automatically tracks the fault resistance and apples only the voltage needed to keep the fault alive.

  • Page 7: Description Of The Eg 3000ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ

    DesCRIPtIon of tHe eG 3000 (Continued) The transmitter meter will pulse even though Note: The meter is not useful for the fault may not be breaking over. The measuring actual fault resistance. neutral ground rod will be seen through the...

  • Page 8: Connecting The Eg 3000 To The Faulted Cableˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ

    Do not move the ground probe while the transmitter is on. CONNECTING THE EG 3000 TO THE FAULTED CABLE 1. After the route of the cable to be worked is located and marked, isolate the cable at both ends.
  • Page 9 When the transmitter is operating and the transmitter meter indicates the fault is being flashed by pulsing up- scale, the EG 3000 Detector is walked down the route of the cable. The two probes can be used, or the operator can use a fixed distance between the probe rods by using the “A”...
  • Page 10 two probes farther apart, a greater difference of voltage can be found, allowing detection of a pulse that may go undetected if the two probes are close together. To set the Balance Control, turn the detector on with the probes in the ground and the cord plugged in to the detector.
  • Page 11 (See Figure 2) Figure 2 EG 3000 Red Coil Cord Black Probe = ( - ) on detector Red Probe = ( + ) on detector At “NULL”...
  • Page 12 ConneCtInG tHe DeteCtoR foR Use (Continued) Place one of the probes directly over the point marked as the fault (center). Move the other probe around all four sides of the center probe, keeping the probe being rotated an equal distance from the center probe at each of the four side locations.
  • Page 13 HELPFUL LOCATING TECHNIQUES A problem some people have experienced operating the EG 3000 detector occurs when they preset the sensitivity control to full gain, without testing lower settings first. The Aqua-Tronics detector is a very high gain amplifier that registers extremely small currents. Operating at full gain can slow the locating process, because stray currents can be seen that did not come from the fault.

  • Page 14: Features And Advantages Of The Eg 3000ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ11

    • The EG 3000 detector has as much gain as any detector on the market. • The EG 3000 transmitter can produce up to 3000 volts of signal if needed to flash over a high impedance faults up to 10 Mohm.

  • Page 15: Connecting The Transmitterfor Tracing The Rout Of The Cable ˍ ˍ ˍ ˍ ˍ12

    The EG 3000 does not do this. Most cable faults can be flashed at 300 volts. If 300 volts does not break down the fault, you know it is a high impedance fault and a little more voltage is needed.

  • Page 16: Locating By Null Method - A700 Receiver ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ

    NULL TRACING METHOD DefInItIon of a nUll A high signal reading is found on both sides of the conductor, and a loss of signal is found directly over the conductor. The sensitivity control setting will determine how sharp or broad the null will be.
  • Page 17 Now that two null points have been found, the route of the conductor can be walked by moving the receiver back and forth over the line being traced. NEVER SWING THE LOCATOR. The receiver should be moved back and forth over the line being traced with the bottom of the antenna area remaining approximately the same distance from the ground at all times.

  • Page 18: Locating By The Maximum Or Peak Method - A700 Receiver ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ15

    LOCATING BY THE MAXIMUM OR PEAK METHOD A-700 RECEIVER With the transmitter connected and operating, move out 5 or10 feet from the transmitter. Turn on the receiver and push the NULL/PEAK button to the PEAK position. Adjust the sensitivity control for a mid scale meter reading. Walk a half circle around the transmitter in the direction the meter indication starts to increase.

  • Page 19: Digi-7 Receiver Manual Modeˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ

    to find the conductor. As the receiver moves past the NULL point, the directional arrow will change, and a different tone will be heard. Each time the conductor is crossed, the directional arrow will change, and the sound being heard will also change. The numerical signal strength meter will read 'Absolute signal' and it will be at a maximum even though the receiver is in the NULL mode of operation.

  • Page 20: Tracing With The Inductive Couplerˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ ˍ17

    The Inductive Coupler is plugged into the EG 3000 T transmitter into the inductive output phone jack. The TONE TRACE TAP SELECTOR SWITCH should be set to TAP#1. This will set the impedance of the transmitter to the impedance of the Inductive Coupler for the best trace.
  • Page 21 DeteRMInInG DePtH On a right 45˚ triangle, two of the sides are equal. The receiver positioned at 45˚ and off to either side of the marked cable route can determine the cable depth. The receiver antenna decal has black arrows pointing down the antenna housing. When the receiver is positioned at a 45˚...
  • Page 22 The EG 3000 battery should be recharged after each use to ensure that the battery is ready to use on the next cable fault. The battery used in the EG 3000 is an 8Ah, 12-volt sealed lead-acid type and provides well over 8 hours of continuous use when fully charged.

This manual is also suitable for:

Eg 3000t

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