Megger DET3 Series Bedienungsanleitung

NEW PRODUCT LAUNCH

Megger Limited PWS / Nov 06

DET4TC/R launch

Sales guide

The latest additions to the DET Earth testing range.

Providing a solution to every

earth testing challenge

Megger Limited PWS / Nov 06

DET4TC/R Launch

Table of Contents

PRODUCT FAMILY ....................................................................... 3

DET4TC/R Selection Chart........................................................... 3

NEW – Professional Earth Testing Kit........................................ 4

THIS PRODUCT IS USED FOR? .................................................. 5

WHY?............................................................................................. 5

THIS PRODUCT IS USED BY? ..................................................... 6

TECHNICAL OVERVIEW .............................................................. 7

Principle of Operation .................................................................. 8

FEATURES, ADVANTAGES AND BENEFITS ........................... 10

ORDERING INFORMATION........................................................ 11

COMPETITOR ANALYSIS .......................................................... 11

DET4TC/R Verses Fluke 1623 ...............................................................................12

DET4TC/R Verses Fluke 1625 ...............................................................................13

DET4TC/R verses Metrel M2124C.........................................................................14

Appendix A.................................................................................. 15

Application Guide .................................................................................15

The “ART” of earth electrode testing ............................................15

Just a little aside ..........................................................................................16

Megger gets down to earth with “ART”...............................................16

Don’t underestimate the power of “ART” ...........................................18

The problem with Spheres of Influence..............................................19

We all like “ART” but sometimes it’s misunderstood ....................21

Some resistance to ART ..........................................................................22

The Best Application of “ART” ...............................................................22

“STAKELESS” Earth Electrode Testing .....................................23

Incorrect use of Stakeless testing.........................................................25

The Best Application of “Stakeless” testing......................................26

Megger Limited PWS / Nov 06

DET4TC/R Launch

PRODUCT FAMILY

The new products are additions to the DET3 and 4 contractor series of earth testers,

launched about a year ago.

The instruments utilises the same rubber armoured, IP54 rated case as the DET3

and is supplied in a tough blow moulded case together with test leads and spikes.

The structure of the new instruments is as follows:

DET4TC 2, 3 & 4 pole earth testers with ART and Stakeless testing

capability

DET4TCR 2, 3 & 4 pole, rechargeable, earth testers with ART and

Stakeless testing capability.

DET4TC+Kit 2, 3 & 4 pole earth testers with ART and Stakeless testing,

complete with ICLAMP and VCLAMP.

DET4TCR+Kit 2, 3 & 4 pole, rechargeable, earth testers with ART and

Stakeless testing, complete with ICLAMP and VCLAMP.

The new DET4 range replaces the complete DET5/4 range, which has an intended

obsolescence date of 30th June 2007.

The complete contractor series of Earth testers can now be summarised by the

following chart:

DET4TC/R Selection Chart

Where does the name come from?

D E T 4T C R

Digital Earth Tester 4 Terminal Clamp Rechargeable

Feature Sub-feature DET3T

DET3TD DET3TC DET4TD DET4TC DET4TCR

Display Analog

✔

Digital

✔✔✔✔✔

Back light

✔✔

Earth Tests 2 Pole

✔✔✔✔✔✔

3 Pole (Fall of potential)

✔✔✔✔✔✔

4 Pole (Soil resistivity)

✔✔✔

Selective (ART) capability

✔✔✔

Stakeless (2 clamps)

✔✔

Earth Resistance Range 0.01 to 2kΩ

✔✔✔✔

0.01 to 20kΩ

✔✔

Earth Voltage Range 0-100V

✔✔✔✔✔✔

Earth Current Range 0.5mA to 19.9A

✔✔✔

Supply Alkaline batteries

✔✔✔✔✔

Rechargeable batteries

✔

Megger Limited PWS / Nov 06

DET4TC/R Launch

NEW – Professional Earth Testing Kit

To complement the launch of the new DET4TC/R a new Professional Earth Testing

Kit will be available shortly.

The new kit is innovative, high quality and comes supplied in a tough hard carry case

similar to the instrument carry case.

The kit consist of the following:

• Four twist in auger style test spikes

• Four test leads (2 x 50m, 2 x 30m)

o Supplied on four reels with test lead wind in while mounted on test

spike feature.

o Reels have innovative test lead brushing feature to clean while

winding in.

• Tape measure

Kit part number: 6320-245

Megger Limited PWS / Nov 06

DET4TC/R Launch

THIS PRODUCT (DET4TC/R) IS USED FOR?

This product is used for both soil resistivity testing (4 pole) and earth electrode (2 and

3 pole) testing. Methods such as ART allow earth electrodes to be tested without

disconnection. The addition of Stakeless testing will allow testing of electrode where

the use of test stakes is impractical.

WHY?

• Soil resistivity testing. (4 pole)

o Used to locate the best lowest resistance location for a new earth

system.

o Obtain earth resistance values required to design the earth system

o Geophysics – locating changes in geology

• Earth Electrode testing (2, 3 pole)

o Earth electrode / system resistance must be low and reliable. Why?

• To ensure enough current to flow in fault conditions to ensure

the circuits’ protective device trips out in time. Failure to trip or

trip too slowly can result in expensive damage to equipment,

fire or serious injury.

• Lightning strike protection.

• Improve equipment performance by reducing noise levels.

• Static electricity dissipation.

• Prevent dangerously high step or contact voltages present

during fault or high load conditions, another safety issue.

o Earth systems require testing both immediately after installation, and

at regular intervals thereafter as part of a maintenance program.

• ART – Attached Rod Technique

o This method is an additional feature used when performing the

standard 3 pole method when testing earth electrode resistance.

o The main problem associated with testing an electrode resistance is

the requirement to disconnect it. This is because the test current from

the instrument will flow, not just down the electrode being tested, but

also through any other parallel paths. E.g. other electrodes in the

system or back through the building earth.

• ART uses a clamp to measure only the current flowing down

the electrode being tested; the instrument then uses this

measurement to calculate the resistance of electrode.

Megger Limited PWS / Nov 06

DET4TC/R Launch

• Stakeless Test – Look no test spikes!

o Although the 3-pole method is the traditional method of test earth

electrode resistance, it relies on driving auxiliary test spikes into the

ground, which is not always practical. Imagine trying to drive spikes in

inner city concrete jungles, and locations such as cable cellars

beneath sub stations.

o Another ideal application for this test is measuring electrode

resistance on lightning protection system on buildings.

• The stakeless method utilises two clamps. One to induces

current into the circuit the other the measure the resulting

amount.

• The measurement taken is the resistance of a loop, including

that of the electrode under test.

• The reading will not directly compare to the 3-pole method due

to the additional elements in the reading. However the

readings will always be optimistic and should be repeatable,

ideal for monitoring the earth electrode condition over time.

• Stakeless measurements made in 4-pole mode allow all test

lead resistances to be ignored.

In summary, with the addition of ART and Stakeless testing, DET4TC/R is an

excellent replacement for the DET5/4. The DET4TC/R provides real additional

benefits to the customer in terms of ease of use and the ability to take measurements

in situations the DET5/4 cannot.

Provided with this sales guide in appendix A, is a applications note giving detailed

information on how to use ART and Stakeless testing. This will give valuable

assistance to customers, allowing them to fully understand and get the most from

these test methods.

Further, more detailed information on earth testing may be found on the Megger

Earth/ground micro site. http://www.megger.com/us/story/Index.php?ID=125

THIS PRODUCT IS USED BY?

• Electrical contractors,

• Utilities, Maintenance

• Railways

• Repair Organisations (Industrials),

• Telecoms and Datacoms installers.

• Specialist grounding/earthing companies and consultants.

• Petro-chemical companies

• Service providers

Megger Limited PWS / Nov 06

DET4TC/R Launch

TECHNICAL OVERVIEW

Megger Limited PWS / Nov 06

DET4TC/R Launch

DET4TCR

The instrument and display layout are identical with the exception of the 12V input for

battery charging.

Principle of Operation

The principal of operation is fully described in the User Guide, a copy of which has

been provided as part of the launch pack. However since the DET4TCR is replacing

the DET5/4, just the pertinent parts covering the additional ART and Stakeless

capabilities have been reproduced in this document.

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 resistance. This arrangement is shown in

Figure 7.

Megger Limited PWS / Nov 06

DET4TC/R Launch

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.

Principle of operation (two-clamp stakeless 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 stakeless 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 8

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

resistance of the other electrodes in parallel approaches zero, then the resistance

measured, approaches the value of the electrode under test.

Megger Limited PWS / Nov 06

DET4TC/R Launch

FEATURES, ADVANTAGES AND BENEFITS

DET4TC/R

F: Tough rubber armoured IP54 rated instrument case.

A: Case can withstand knocks, and the outdoor environments experienced when

earth testing.

B: Instrument will last a long time, and will be ready to test when required.

----------------------------------------

F: Supplied in tough blow moulded carry case.

A: Keeps instrument, test leads, spikes, and optional clamps together and

protected.

B: Helps prevent loss of accessories, also makes ideal ‘tray’ to put the

instrument on when testing. Saves having to lay the instrument directly onto

muddy ground.

----------------------------------------

F: Supplied with calibration certificate, test leads and spike kit.

A: Nothing more to buy to start testing.

B: Saves time having to source separate leads and spikes. No waiting for

calibration to be carried out. No hidden costs. Convenient.

----------------------------------------

F: Back light

A: Easy to read in low light environments

B: Easier to operate when not having to use a torch to be able to read the

display.

----------------------------------------

F: ‘Attached Rod Technique’ capability, ART.

A: With the addition of an ICLAMP the instrument is able to take 3 or 4 pole

measurements of earth electrodes without disconnecting them.

B: Saves both time and aggravation having to undo rusted connections. No need

to shut down supply to ensure safety.

----------------------------------------

F: ‘Stakeless’ testing capability.

A: No need to drive test spikes in ground to perform measurement.

B: Allows testing in areas when driving test spike is impossible. E.g. Sub station

cable cellars, or when testing lightning protection in concreted locations.

----------------------------------------

F: One button operation with automatic noise check and automatic P and C

spike resistance check.

A: Easy to operate.

B: Little time required learning operation, and time saved not having to spend

considerable time troubleshooting poor connections etc.

----------------------------------------

F: User selectable output voltage – 25V or 50V

A: 25V required for testing agricultural environments

B: The ability to test in agricultural locations as per IEC61557-5. 25V will not

harm livestock.

----------------------------------------

F: 40V Pk to Pk Noise rejection

A: Able to make accurate measurements with up to 40V peak to peak (ground

voltage) between the potential terminals.

B: Can be used in most locations with ground noise such as sub-stations, near

transformers etc.

Dieses Handbuch passt für folgende Modelle

Inhaltsverzeichnis

Andere Megger Prüfgeräte Handbücher

Megger

Megger DET4 Series Bedienungsanleitung

Megger

Megger SVERKER 900 Bedienungsanleitung

Megger

Megger BMM500 Series Bedienungsanleitung

Megger

Megger MFT1711 Bedienungsanleitung

Megger

Megger T22/13B Bedienungsanleitung

Megger

Megger MTR105 Bedienungsanleitung

Megger

Megger VLF Sinus 62 kV Bedienungsanleitung

Megger

Megger MPRT 8415 Bedienungsanleitung

Megger

Megger VLF Sinus 62 Bedienungsanleitung

Megger

Megger HPG AC Series Bedienungsanleitung

Megger

Megger PAT100 Series Bedienungsanleitung

Megger

Megger BM5200 Bedienungsanleitung

Megger

Megger S1-1054 Bedienungsanleitung

Megger

Megger BT 500-IS-1 Bedienungsanleitung

Megger

Megger MTO210 Bedienungsanleitung

Megger

Megger SR-98 Bedienungsanleitung

Megger

Megger 220015 Series Bedienungsanleitung

Megger

Megger TRS1 Bedienungsanleitung

Megger

Megger MIT400/2 Series Bedienungsanleitung

Megger

Megger SVERKER 900 Bedienungsanleitung

Megger

Megger TRS1PLUS Bedienungsanleitung

Megger

Megger OTS80PB Bedienungsanleitung

Megger

Megger PAT400 Series Bedienungsanleitung

Megger

Megger Centrix Evolution Bedienungsanleitung

Beliebte Prüfgeräte Handbücher anderer Marken

SMART

SMART KANAAD SBT XTREME 3G Series Bedienungsanleitung

Agilent Technologies

Agilent Technologies BERT Serial Bedienungsanleitung

Agilent Technologies

Agilent Technologies N3280A Bedienungsanleitung

Lifeloc

Lifeloc R.A.D.A.R. Bedienungsanleitung

Fluke

Fluke T5-600 Bedienungs- und Montageanleitung

Mercury

Mercury TSL01 Bedienungsanleitung

MAHA

MAHA MBT Series Bedienungsanleitung

Fuji Electric

Fuji Electric P-61 Bedienungsanleitung

ETC

ETC SealerAtor Bedienungsanleitung

Skyfine

Skyfine ETHYWAY V2 Bedienungsanleitung

Appion

Appion G5 Twin Bedienungsanleitung

PCB Piezotronics

PCB Piezotronics 8159-0112A Bedienungsanleitung

BW Technologies

BW Technologies MicroDock II Bedienungsanleitung

Sun Nuclear

Sun Nuclear 1027 Bedienungsanleitung

Biomark

Biomark HPR LITE READER Bedienungsanleitung

Hioki

Hioki 3169-20 Bedienungsanleitung

Ashcroft

Ashcroft ATE-100 Bedienungsanleitung

Rohde & Schwarz

Rohde & Schwarz RTA4000 Bedienungsanleitung