METREL A 1588 Manuel utilisateur

Multi range AC crrent clamps

(0.5A / 5A / 50A)

A 1588

Instruction manual

Version 1.0, Code no. 20 752 829

Distributor:

Manufacturer:

METREL d.d.

Ljubljanska cesta 77

1354 Horjul

Slovenia

web site: http://www.metrel.si

e-mail: [email protected]

Mark on your equipment certifies that this equipment meets the requirements of the EU

(European Union) concerning safety and electromagnetic compatibility regulations.

No part of this publication may be reproduced or utilized in any form or by any means without

permission in writing from METREL.

A 1588 Multi range AC current clamps

Table of contents

DESCRIPTION OF CURRENT CLAMPS........................................................................5

CURRENT CLAMPS OPERATION.................................................................................6

OPERATION INSTRUCTIONS..............................................................................................6

SUBSTITUTE ELECTRIC MODEL FOR CURRENT CLAMPS.....................................................7

TYPICAL APPLICATIONS..............................................................................................7

POWER QUALITY MEASUREMENT.....................................................................................7

POWER MEASUREMENT ..................................................................................................8

LEAKAGE CURRENT MEASUREMENT.................................................................................8

Measurement Of Leakage Current By Direct Method.............................................................8

Measurement Of Differential Current And/or Current Difference .........................................8

Determining Problems In Lighting And Grounding Systems..................................................8

MAINTENANCE..............................................................................................................9

INSPECTION ...................................................................................................................9

CLEANING......................................................................................................................9

SERVICE AND CALIBRATION.............................................................................................9

TECHNICAL SPECIFICATIONS.....................................................................................9

GENERAL.......................................................................................................................9

ACCURACY AND PHASE ERROR.....................................................................................10

TYPICAL PERFORMANCE CHARACTERISTICS ...................................................................10

ELECTROMAGNETIC COMPATIBILITY (EMC) ....................................................................11

A 1588 Multi range AC current clamps

Symbols and Warnings

To ensure a high level of operator's safety during using of A 1588 Multi range AC current

clamps the following warnings has to be considered:



Do not use the current clamp if any damage is noticed!



Consider all generally known precautions in order to avoid risk of electric shock

while dealing with electric installations!



Do not extend hands over safety barrier to prevent of electric shock! Only

handles are allowed to be touched during measurement!



Symbol on the current clamp indicates the possibility of a hazardous live

condition if the operator ignores the required safety measures.



If the current clamps are used in a manner not specified in this User manual, the

provided protection can be impaired!



Only a competent, authorized person is allowed to carry out service intervention!



Do not connect clamp output elsewhere than to Metrel PQ series of measuring

instruments (Energy Master MI 2883, Master Q4 MI 2885 and Power Master MI 2892)!

Symbol on the current clamp indicates the possibility to use the current clamp on

non-insulated conductors.

Current clamps are protected by double insulation.

A 1588 Multi range AC current clamps

Description of current clamps

The A 1588 multi range current clamps are designed for measuring alternating currents on low

and medium power installations: 50 mA ÷ 50 A.

They have electronic module, and can be connected only to Metrel PowerQ series of measuring

instruments:

Energy Master (MI 2883)

Master Q4 (MI 2885)

Power Master (MI 2892)

Clamps have three current ranges 0.5A, 5A and 50A, which are selected directly by the

connected instrument. Embedded electronic module is powered directly from the connected

instrument and does not need any additional power supply.

The current transducer is housed in a plastic case that maintains double insulation as defined in

Main parts of the current clamps are shown on figure bellow:

1. handles,

2. safety barrier,

3. conductor opening,

4. clamps jaw,

5. cable connection with

connector.

Figure 1: Multi range AC current clamps

A 1588 Multi range AC current clamps

Current clamps operation

Operation Instructions

Figure 2: Current clamps A 1588 - connection to the measuring instrument

Step 1

Connect A 1588 current clamps output connector to the appropriate (Metrel Power series)

measuring instrument’s current input terminal.(See figure 2)

Do not connect clamp output elsewhere than to Metrel PQ series of measuring

instruments (Energy Master MI 2883, Master Q4 MI 2885 and Power Master MI 2892)!

Step 2

Switch on the measuring instrument. Set Smart clamps and range on instrument’s measuring

setup. (For further information see Instruction manual of measuring instrument.)

Step 3

Clamp the probe around the current-carrying conductor(s) to be measured. Make sure that

probe jaws are tightly closed around the conductor(s).

Do not extend hands over safety barrier to prevent of electric shock! Only handles

are allowed to be touched during measurement!

Do not use the current clamp if any damage is noticed!

Consider all generally known precautions in order to avoid risk of electric shock

while dealing with electric installations!

Step 4

A 1588 Multi range AC current clamps

Make measurement. (For further information see Instruction manual of measuring instrument.)

Step 5

Disconnect clamps from the conductor(s).Use all safety measures as described in step 3.

Substitute Electric Model For Current Clamps

Equivalent circuit diagram for current clamp measurement:

Im Is

1 : N2I

Rangeselection:

- 500mA

- 5 A

- 50A

GND

U(I)

Instrument

Connector

Figure 3: Current clamps A 1588 - block diagram

Symbols on circuit diagrams have following meaning:

Measured (AC) current, primary current

Measured current, current transformer secondary current

Number of secondary turns (N2 = 1000)

U(I)

Output voltage as function of current U = k * Im. Factor k depends on

selected current range as shown in table bellow:

Range (A)

k (V/A)

0,5

0,2

0,01

Typical applications

Power Quality Measurement

A 1588 current clamps have linear response through wide frequency bandwidth (see Figure 8).

Therefore they are well suited for:

Power Quality auditing,

EN 50160 or troubleshooting. Particularly for:

Current distortion measurement

Inrush measurement

Functional testing of appliances, machines, etc.

High precision (see Figure 6) and wide measurement range can cover most of practical LV

current measurements.

A 1588 Multi range AC current clamps

Power Measurement

A 1588 current clamps have small phase shift (see Figure 7 and Figure 9) over wide frequency

range. Therefore they are well suited for:

Power and energy measurements (active, reactive, apparent)

Power factor measurements

Power/Energy efficiency

Leakage Current Measurement

Measurement Of Leakage Current By Direct Method

This method is used when measuring the current through one (embraced) conductor.

Figure 4: Leakage current measurement –direct method

Measurement Of Differential Current And/or Current Difference

The differential method sums the current passing through two or more active (embraced)

conductors. If no current is leaking to earth,, the sum of the currents passing through active

conductors must be exactly zero regardless of the load currents. If a leakage current is flowing

to earth, it must be equal to the difference in current between the conductors contained in the

current clamp (although, if alternative earth paths exist, this may not be equal to the current

passing through the PE conductor).

Note

Note that the direction of currents in the conductors must be considered if the differential

method is used.

Figure 5: Leakage current measurement –differential method

Determining Problems In Lighting And Grounding Systems.

Faults in electrical installations and equipment can cause additional continuous or short-

lasting leakage currents. Typical faults that can cause increased leakage currents are:

A 1588 Multi range AC current clamps

Deterioration of insulation (because of pollution, moisture, corrosion). This is causing

a gradual increase of the resistive leakage current.

Faults in electronic equipment.

If the neutral and PE wiring are connected together anywhere in the installation this

can result in an improper current distribution through the neutral and PE conductors.

Note

Metrel Application note: Measuring of leakage current contain many practical aspects and

examples of leakage current measurement.

Maintenance

Inspection

To maintain operator safety and ensure reliability of the current clamp it is good practice to

inspect it on a regular basis. Check that the enclosure and optional connection are without

defects such as scratches or breaks.

Jaw surface must be clean. Pollution on jaw surfaces reduces the current clamp sensitivity.

Cleaning

Use a soft cloth moistened with soapy water or alcohol to clean non-metallic surface of the

current clamps and leave them to dry totally before using it.

Do not use liquids based on petrol or hydrocarbons!

Do not spill cleaning liquid over the current clamps!

To clean jaw cut surfaces use slightly oiled soft cloth.

Service And Calibration

It is essential that your clamp is regularly calibrated in order to guarantee the technical

specification listed in this User manual. We recommend 2-year calibration interval. Metrel

encloses an original calibration certificate with every new instrument and clamp.

For recalibration and repairs under or out of warranty time please contact your distributor for

further information.

Only a competent, authorized person is allowed to carry out service intervention!

Technical Specifications

General

Safety specification

Over voltage category: 600 V CAT II,

Pollution degree: 2

Double insulation

Environment conditions

Working temperature: -10 0C ÷ 50 0C

Storage temperature: -20 0C ÷ 70 0C

Humidity: 0 % ÷ 85 %,

Linearly decreasing for T > 35 0C

Altitude: 2000 m

Applied standards

Mechanical data

Jaw opening: 40 mm

Maximum conductor sizes:

Cable: < 50 mm

Bar: 1 bar 50 mm x 5 mm,

4 bars 30 mm x 5 mm

Housing flammability: UL94 –V-1

Dimension: 177 mm x 53 mm x 23 mm

Weight: ~160 g

A 1588 Multi range AC current clamps

Safety: EN/IEC 61010-1

EN/IEC 61010-2-32

EMC: EN/IEC 61326-1

Accuracy And Phase Error

Reference conditions:

Temperature: 23 0C 1 0C

Humidity: 60 %

Current range

Nominal current (INom)

0.5 A

5 A

50 A

Peak current

1.5 APEAK

15 APEAK

150 APEAK

Crest factor @ Nominal current

3,0

Accuracy

Current range*

50 mA ÷1 A

0.5 A ÷10 A

5 A ÷100 A

RMS Current Accuracy

0.5 % of m.v.

Frequency range

40 Hz ÷ 700 Hz (<0.50phase error)

700 Hz ÷ 2500 Hz (<30phase error)

Continuity of measurements

100 A continuous

120 A (40 min / 20 min intermitted)

Load impedance

< 1 kΩ

Working voltage

600 Vrms

Influence of neighbour conductor:

< 1 mA/A at 50 Hz

Influence of conductor position:

< 0.3 % at f < 400 Hz

*Accuracy for 0÷10% range is 0.1% · INom

m.v. –measured value

Typical Performance Characteristics

-2,00

-1,50

-1,00

-0,50

0,00

0,50

0,0 2,0 4,0 6,0 8,0 10,0 12,0

Current (A)

Accuracy (%)

Figure 6: Accuracy vs. current (for 5A range)

0,00

0,20

0,40

0,60

0,80

1,00

1,20

1,40

0 5 10 15

Current (A)

Phase Error (°)

Figure 7: Phase error vs. current (for 5A range)

Table des matières

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