Related Manuals for AEMC instruments GroundFlex 6474
Summary of Contents for AEMC instruments GroundFlex 6474
- Page 1 User Manual ENGLISH GroundFlex Adapter ® Model 6474 ® GROUNDFLEX ADAPTER WITH AEMC ® INSTRUMENTS GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
- Page 2 Copyright © Chauvin Arnoux ® , Inc. d.b.a. AEMC ® Instruments. All rights reserved. No part of this documentation may be reproduced in any form or by any means (including electronic storage and retrieval or translation into any other language) without prior agreement and written consent from Chauvin Arnoux ®...
- Page 3 Statement of Compliance Chauvin Arnoux ® , Inc. d.b.a. AEMC ® Instruments certifies that this instrument has been calibrated using standards and instruments traceable to international standards. We guarantee that at the time of shipping your instrument has met its published specifications. NIST traceable calibration is only possible when the Model 6474 is connected to the Ground Tester Model 6472.
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Page 4: Table Of Contents
TABLE OF CONTENTS 1. INTRODUCTION ..............5 1.1. PRECAUTIONS FOR USE ............. 6 1.2. RECEIVING YOUR SHIPMENT ............ 6 1.3. ORDERING INFORMATION............7 1.3.1. Accessories ................7 1.3.2. Replacement Parts ..............7 ® 2. GROUNDFLEX ADAPTER ..........8 2.1. CONTROL FEATURES ..............8 ®... -
Page 5: Introduction
1. INTRODUCTION ® ® Thank you for purchasing an AEMC Instruments GroundFlex Adapter Model 6474. For the best results from your instrument and for your safety, you must read the enclosed operating instructions carefully and comply with the precautions for use. Only qualified and trained operators should use this product. -
Page 6: Precautions For Use
1.1. PRECAUTIONS FOR USE These safety warnings are provided to ensure the safety of personnel. Please read and comply with these precautions: This instrument is protected from accidental voltages of not more than 50V with respect to earth in measurement CAT IV. The guaranteed level of protection of this equipment may be compromised if used in a manner not specified by the manufacturer. -
Page 7: Ordering Information
1.3. ORDERING INFORMATION ® NOTE: The GroundFlex Adapter Model 6474 only operates in combination with the Ground Tester Model 6472 Kit - 500 ft. ® GroundFlex Field Kit (Model 6472 and 6474) ......Cat. #2136.03 Includes: (Ground Tester Model 6472 Kit-500 ft (Cat #2135.54)); Model 6472, (1) carrying bag, (2) 500 ft. -
Page 8: Groundflex ® Adapter
® 2. GROUNDFLEX ADAPTER 2.1. CONTROL FEATURES GroundFlex ® Sensor SENSOR TURNS 50V CAT IV To Model 6472 Overload SENSITIVITY INPUT 1-2-3 1-2-3-4 GroundFlex ® Adapter For Use with the MODEL 6474 Ground Tester Model 6472 ® Inputs 1 through 4 for GroundFlex sensors Connector for connection lead to the Ground Tester Model 6472 OVERLOAD indicator... -
Page 9: Groundflex Sensor
® 2.2. GROUNDFLEX SENSOR ® The GroundFlex sensors are placed around a conductor (tower leg or pole) and closed using a screw connector, which is part of the sensor. This closed loop is then used to make a contact-free measurement of the current flowing in the con- ductor (leg) it is wrapped around. -
Page 10: Calibration Of Groundflex
2.2.1. Calibration of GroundFlex ® Sensors Calibration is necessary for a new sensor, one that is no longer identified when a sensor has been replaced, or more than 2 lengths of extension cable is used. The calibration coefficients are then stored in the Model 6474. WARNING: Do not move or touch the GroundFlex ®... - Page 11 Set the switch of the 6472 to SET-UP. Set the SENSOR TURNS switch to 4. Set the SENSITIVITY switch to x1. Set the INPUT SELECTION switch to 1. SENSOR TURNS SENSITIVITY INPUT 1-2-3 1-2-3-4 Press the Hz/OPTIONS button 5 times. The device starts by comparing the current I injected by the device into the ®...
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Page 12: Measurements In Auto Mode
To start the calibration, press 2nd + START. ® The device calculates and stores a calibration coefficient for the GroundFlex sensor connected to channel 1. S x 1 AUTO This operation must be repeated for channels 2, 3 and 4; the INPUT SELECTION switch must be set to the corresponding position each time. - Page 13 NOTE: • The sensors have arrows to indicate a direction. • All sensors should face the same direction (clockwise or counter-clockwise around the tower legs) • All sensors should have the same number of wraps. • Sensors should encircle both leg AND ground system. To the Model 6472 6474 On the Model 6474, set the INPUT selection switch accordingly.
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Page 14: Making A Measurement (Resistance Of Legs)
2.3.2. Making a Measurement (Resistance of Legs) Place auxiliary electrodes H (Z) and S (Y) on opposite sides of the tower, as far away as possible (100-150 ft) and, if possible, perpendicular to the high- voltage line (depth is not important). This will eliminate interference with the measurement by stray voltages or currents induced under the high-voltage line. - Page 15 Overhead earth wire High-voltage lines 6472 ® 4 GroundFlex sensors connected with the same orientation 6474 ® WARNING: If the GroundFlex Adapter Model 6474 is connected to the earth tester, the earth potential connected to the terminals E (X) and ES (Xv) will also be present at the BNC connectors of the GroundFlex ®...
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Page 16: Other Measurements
To display the measurement parameters, press DISPLAY several times. The device displays the following parameters: and its frequency, I , R-Act (R ), U-Act (U and its frequency, S-ES PASS S-ES and its frequency), I-Act (I and its frequency). To measure the resistances of electrodes H (Z) and S (Y), or if the resistance of the electrodes is too high, start the measurement by a long press (approx 2 sec) of the START/STOP button (you will hear a 2nd beep). - Page 17 In the sweep mode, the measurements can be made at frequencies up to 5kHz. On a single tower, frequencies in the order of 5kHz do not always entail inductive effects, but the "current loops" formed by the adjacent towers and the return chan- nel through the ground may result in inductances that can be detected only at high frequencies.
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Page 18: Tower Testing Measurement
2.5. TOWER TESTING MEASUREMENT Connect the green Current (E) and black Voltage (ES) test leads to the ground- ing system to be tested using separate cables. Connection points should be ® side by side and above the GroundFlex (Rogowski) coil when testing tower leg resistance and/or impedance. - Page 19 NOTE: The resistance for the H and S electrodes to earth should each be below 1 kΩ to ensure good test results Figure 3 For the most accurate measurements, roll the cable completely out to elimi- nate any inductance problems in locations with high overhead energy from the HV line.
- Page 20 First check (see Figures 5, 6, 7, and 8): Figure 5 Figure 6 Press the DISPLAY button until U-Act. and US-ES or UH-E is shown. U-Act. refers to live actual voltage. U S-ES equals measured voltage between S and ES. Disturbance voltage measurements on the S Probe and the H Auxiliary electrode will run continuously as long as a test has not been initiated with the START button.
- Page 21 Next, press the DISPLAY button until RPASS appears. A leakage current I- SEL, when induced in the pylon, produces a voltage drop US-ES (potential difference to Earth) on the earth-resistance of the pylon. Once the I-SEL and US-ES values are known, the 6472 can calculate RPASS (passive earth re- sistance).
- Page 22 Third check (See Figure 10): Start a measurement with a long press on the 6472 START button in the 4-pole switch position. This will initiate the test using 32 Volts and will provide the full complement of test results including auxilary rod (H and S) resistance. The measurement will be conducted at 128 Hz.
- Page 23 Figure 11 2nd measurement (See Figure 12): ® GroundFlex sensor measurement into static wire (overhead ground conductor) Make sure the device is in SWEEP Mode. Move the current injection wire E (green) so it feeds through the GroundFlex ® sensors on the tower leg and connects next to the potential connection. Do not move the ES (black) potential connection.
- Page 24 The overhead ground conductor (OGC) connects the grounding systems of all towers in parallel at low frequencies, but at higher frequencies the inductance of the OGC starts to separate them such that the effective impedence of an individual tower can effectively be measured. Measure the resistance/impedance in 10 % increments between E and H.
- Page 25 Glossary E Terminal: is a green colored terminal and is the current injector terminal. It is also known as the X terminal ES Terminal: is a black colored terminal and is the voltage measurement terminal. It is also known as the Xv terminal. S Terminal: is a blue colored terminal and is the voltage return terminal.
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Page 26: Specifications
3. SPECIFICATIONS 3.1. ELECTRICAL Measuring Method: Voltage/Current measurement with a rectangular AC signal Short Circuit Current: > 200 mA Noise Suppression: > 80 dB at frequencies differing by 20 % or more from the test frequency Max. Overload: 250 Vrms Max. - Page 27 The operating error of AC resistance measurements can be less than that specified for voltage or current because frequency characteristics of the voltage channel are matched to those of the current channel. For test frequencies between 41 and 5087 Hz, between 1 and 4 turns of the ®...
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Page 28: Mechanical
3.2. MECHANICAL Dimensions: (10.7 x 9.76 x 5.12) in (272, 248 x 130) mm Weight: 7 lbs (3.2 kg) approx Case Material: ULV0 Polypropylene Terminals: 4 mm recessed banana jacks Case Protection: EN 60529 - IP53 (cover closed) Drop Test: Per EN 61010-1 Vibration Test: Per EN 61557-1 3.3. -
Page 29: Maintenance
4. MAINTENANCE NOTE: Please make sure that you have read and fully understand the Precautions for Use section on page 6 • To avoid electrical shock, do not attempt to perform any servicing unless you are qualified to do so. •... -
Page 30: Technical And Sales Assistance
4.3. TECHNICAL AND SALES ASSISTANCE If you are experiencing any technical problems, or require any assistance with the proper operation or application of your instrument, please call, mail, fax, or e-mail our technical support team: 4.4. LIMITED WARRANTY The instrument is warrantied to the owner for a period of two years from the date of original purchase against defects in manufacture, unless the instrument was registered within 30 days of the purchase date (see warranty note below). -
Page 31: Warranty Repairs
4.4.1. Warranty Repairs What you must do to return an Instrument for Warranty Repair: First, request a Customer Service Authorization Number (CSA#) by phone or by fax from our Service Department (see address below), then return the instrument along with the signed CSA Form. Please write the CSA# on the outside of the shipping container.
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