Megger MFT1735 Bruksanvisning
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The word ‘Megger’ is a registered trademark
MFT1735
User guide addendum
Megger Limited
Archcliffe Road
Dover, Kent CT17 9EN
England
T +44 (0)1 304 502101
F +44 (0)1 304 207342
Megger
4271 Bronze Way,
Dallas, TX 75237-1019
USA
T +1 800 723 2861
T +1 214 333 3201
F +1 214 331 7399
Megger
Z.A. Du Buisson de la Couldre
23 rue Eugène Henaff 78190
Trappes, France
T +33 (0) 1 30.16.08.90
F +33 (0) 1 34.61.23.77
Other technical sales offices
Toronto Canada, Sydney Australia, Mumbai india, Madrid Spain and the Kingdom of Bahrain.
Megger products are distributed in 146 countries worldwide.
This instrument is manufactured in the United Kingdom.
The company reserves the right to change the specification or design without prior notice.
Megger is a registered trademark
Part No. 2005-290
MFT1735_ad_en_V04
www.megger.com
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Operation of the MFT1735 is identical to the MFT1730 except for the following
section on Earth Testing.
For Safety Warnings refer to the printed Quick Start Guide.
For all other operating instructions, refer to the MFT1730 sections within the
full User Guide on the included CD.
F.3 Principle of operation (two-clamp stake-less resistance
measurement)
In this example, the electrode under test is connected to a network of other electrodes. It is either
impractical or unsafe to disconnect an individual electrode for testing. Also, there might be insufficient space
to perform a classic three-terminal resistance measurement. The stake-less test method using both VCLAMP
and ICLAMP can be used to obtain a measurement for the electrode under test.
A defined test voltage is injected into the system using the VCLAMP, inducing a current, I, to flow and be
measured by the ICLAMP. The model shown in Figure 7 can be simplified to the resistance of the electrode
under test, Rx and the resistance of the other electrodes in parallel, i.e. R1 || R2 || … || Rn.
Therefore, the current induced by the test voltage is I=V/[Rx+(R1 || R2 || … || Rn)]. It follows that as the resist-
ance of the other electrodes in parallel approaches zero, then the resistance measured, approaches the value
of the electrode under test.
Schematic for two-clamp stake-less resistance measurement
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9. Earth resistance measurement
The Megger MFT1735 offers a unique solution to the measurement of earth or ground electrode (rod)
supporting 2 and 3 wire measurements:
The MFT1735 can use an optional current clamp (ICLAMP) to measure electrode (rod) resistance without dis-
connection, leaving the installation earthing system intact (Attached Rod Technique, ART). Additionally, the
MFT1735 can drive an optional voltage-inducing clamp (VCLAMP) which, in conjunction with the ICLAMP,
can be used to make stake-less measurements of the earthing system.
For the principles of Earth resistance testing go to Appendix F
9.1 Connection terminals
The terminal references used on the MFT are:
The terminal colours correspond to the Earth test lead set, not the standard test leads
shipped with the MFT1700.
MFT1735 Connection panel
9.2 Touch voltage limit
Adjust the touch voltage limit to 25V or 50V depending on location.
(Refer to section 10 in the MFT1730 User Guide)
F.2 Principle of operation (three-terminal resistance
measurement using ART)
The classic three-terminal test method has a disadvantage, namely that the electrode under test must be
disconnected from the system it is supposed to protect in the event of a power system fault. The reason for
this is that the injected test current will take all possible routes to ground and not all of it will necessarily
flow through the electrode under test. In this case, the instrument will make a reading of the entire earthing
network, not just the individual electrode.
By using a current transducer (the Megger ICLAMP) to measure the current flowing through the electrode
under test as a fraction of the total test current injected, the instrument can determine the individual resist-
ance. This arrangement is shown below:
Schematic for three-terminal resistance measurement using
In this configuration, the injected test current I splits along two paths into I1 (flowing into the connected
earthing system) and I2 (flowing into the electrode under test, i.e. I=I1+I2. The resistance of the electrode
under test is calculated as R=V/I2 or R=V/(I-I1). The current transducer (ICLAMP) measures I2 and feeds this
value back to the instrument.
Produktspecifikationer
| Varumärke: | Megger |
| Kategori: | mätning |
| Modell: | MFT1735 |
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