METREL A 1501 Manual de usuario

Flex current clamps

A 1501, A 1502 and A 1503

Instruction Manual

Version 1.1.1; Code No. 20 752 759

Distributor:

Producer:

METREL d.d.

Ljubljanska 77

SI-1354 Horjul

Tel.: +386 1 75 58 200

Fax: +386 1 75 49 226

E-mail: me[email protected]

http://www.metrel.si

Mark on your equipment certifies that it meets European Union requirements

for EMC, LVD, ROHS regulations

No part of this publication may be reproduced or utilized in any form or by any means

without permission in writing from METREL.

Flex current clamps A 1501, A 1502 and A 1503

Table of contents

1Introduction ............................................................................................................. 4

2Main features .......................................................................................................... 4

3Safety...................................................................................................................... 5

4Symbols .................................................................................................................. 5

5Typical applications................................................................................................. 6

5.1 Power Quality Measurement ............................................................................. 6

5.2 Energy and Power Measurement ...................................................................... 6

6Connecting and using clamps in the field................................................................. 6

6.1 Effective current measuring range..................................................................... 8

7Technical specifications........................................................................................... 9

7.1 A 1501 and A 1502............................................................................................ 9

7.1.1 Range 30A - Typical Characteristics.......................................................... 10

7.2 A 1503............................................................................................................. 11

7.2.1 Range 60A - Typical Characteristics.......................................................... 12

8Cleaning................................................................................................................ 13

9Service.................................................................................................................. 13

Flex current clamps A 1501, A 1502 and A 1503

1 Introduction

Flexible Current Clamps A 1501, A 1502 and A 1503 are based on Rogowski coil

principle and can measure alternating currents on low and medium power installations.

Unlike standard current transformers, this type of current sensor does not use magnetic

cores. The transformation principle is based on an air core. It presents virtually no load

to the system under test, has a low phase shift and excellent frequency response.

They consist of current sensor of different lengths and active electronic for multiple

current range, as shown on table below. User should select sensor length according to

the current conductor diameter where measurements will be performed.

Model

Flexible

sensor

length

Maximal

conductor

diameter

Nominal

current range

Effective

measurement range

A 1501

25 cm / 10 in

7 cm / 2,7 in

30 A

300 A

3000A

3 A … 45 A

15 A … 450 A

80 A … 4500 A

A 1502

48 cm / 19 in

14 cm / 5,5 in

A 1503

90 cm / 35 in

27 cm / 10,6 in

60 A

600 A

6000A

6 A …90 A

30 A …900 A

160 A …9000 A

Embedded electronic module provides automatic clamp recognition (for Metrel

instruments) and current range switching. Module is powered directly from attached

instrument, so clamp does not require additional power supply. The flexible sensor

permits measurements on conductors where standard clamp-on current transformers

cannot be used. It is particularly useful for installation in tight spaces, or around breaker

panels, cable bundles, wide or large bus bars and irregular shapes.

Additionally, clamps can’t be damaged by overloads; they are insensitive to DC current,

and measure only the AC component of the current.

2 Main features

Range setup from the instrument, no additional range setup needed

Power supply for electronic module is assured from the instrument

Waterproof sensor

Minimum angle shift to accomplish accurate power measurements

High accuracy

Total rejection of DC component

Friendly-use of the closing-opening system of the current sensor (even if wearing

gloves) due to its highly ergonomic design

Very light, flexible and fully adaptable to busbar trunking system and insulated

cables

Strengthened security, regardless the working environment industrial or services

Flex current clamps A 1501, A 1502 and A 1503

3 Safety

Read the operating instructions before use and follow all safety instructions.

If the test equipment is used in a manner that is not specified in this user manual,

the protection provided by the equipment might be impaired!

Adhere to local and national safety codes. Individual protective equipment must

be used to prevent shock and arc blast injury where hazardous live conductors

are exposed.

Before each use, inspect the Current Clamps and its latching system for any

damage. Pay particular attention to the insulation surrounding the flexible

measuring head. Look for cracks or missing portions of the clamp housing or

output cable insulation. Also look for loose or weakened components.

Do not use a clamp that is cracked, damaged, or has a defective cable.

Never use the clamp on a circuit with voltages higher than 1000 V CAT III or

600 V CAT IV.

De-energize the installation on which current will be measured or adopt safe

operating procedures during application and removal of the current clamp.

Use extreme caution when working around bare conductors or bus bars.

Do not use the Current Clamp to measure bare conductors carrying a voltage

from 30 V up to 1000 V unless you are wearing protective clothing suitable for

high-voltage work. Contact with the conductor could result in electric shock.

Always use appropriate equipment for personal protection.

Use caution when working with voltages above 60 V dc, 30 V ac rms or 42 V ac

peak. Such voltages pose a shock hazard.

4 Symbols

Symbol

Description

Important information. Refer to the manual.

Risk of Electric Shock.

Product is protected by Double/Reinforced insulation

Do not apply around or remove from HAZARDUS LIVE conductors.

Do not dispose of this product as unsorted municipal waste. Contact

Metrel or a qualified recycler for disposal.

Complies with the relevant European standards.

Flex current clamps A 1501, A 1502 and A 1503

5 Typical applications

5.1 Power Quality Measurement

Current clamps have linear response through wide frequency bandwidth (see Figure 7 and

Figure 11). 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 5 and Figure 9) and wide measurement range can cover most of

practical LV current measurements.

5.2 Energy and Power Measurement

Current clamps have small phase shift (see Figure 8 and Figure 12) over wide frequency range.

Therefore they are well suited for:

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

Power factor measurements

Power/Energy efficiency

6 Connecting and using clamps in the field

1. Wrap the flexible measuring head around the conductor to be tested and close

coupling

Figure 1: Flex clamps connection

Flex current clamps A 1501, A 1502 and A 1503

It is very important that the conductor is in the centre and perpendicular to the

current censor as much as possible, in order to minimise position

measurement error.

Minimise influence of adjacent current-carrying conductors, and measure at

the point where they are far away from each other.

Make sure that the arrow marked on the clamp coupling points toward the

correct orientation for correct phase.

Keep the clamp coupling more than 2.5 cm (1 in) away from conductor.

2. Connect Flexible Current Clamps to the desired input on the measuring instrument

Figure 2: 3-phase 4-wire system

3. Select Phase and Neutral clamps to Smart Clamp in Connection setup menu on

your instrument.

4. Select appropriate Current clamp range.

5. Observe the current value and waveform on the instrument’s display. If desired,

select the lower range on the measurement instrument.

Flex current clamps A 1501, A 1502 and A 1503

6.1 Effective current measuring range

Technical specification of current clamp present many different errors which are

influenced by various parameters (position, temperature). Most of them can be

minimised in controlled laboratory use. However in the field ideal measurement

condition can hardly be met. Therefore we recommend selecting clamp measuring

range according to the Effective measurement range, shown in table below.

Effective measurement range is range where measurement error is less than 5 % of

measured value (reading), and includes all relevant errors (residual noise, clamp

accuracy, position sensitivity and instrument accuracy).

Effective measuring range

3A 30A300A 3000A 30000A

3000A range Error > 5% Pure sin

wave

Effective measuring range Pure sin

wave

15A600A

Effective measuring range Puresin

wave60A

300A range

30A range

6000A

Error > 5%

80A

Error > 5%

45A

450A

4500A

Figure 3: A 1501 and A 1502 effective measuring range (error is <5% of m.v.)

Effective measuring range

6A 60A600A 6000A 60000A

6000A range Error > 5% Pure sin

wave

Effective measuring range Pure sin

wave

30A1200A

Effective measuring range Puresin

wave120A

600A range

60A range

12kA

Error > 5%

160A

Error > 5%

90A

900A

9000A

Figure 4: A 1503 effective measuring range (error is <5% of m.v.)

Flex current clamps A 1501, A 1502 and A 1503

7 Technical specifications

7.1 A 1501 and A 1502

FEATURES

DESCRIPTION

NOTES

Length of the sensor

A 1501 –25 cm / 10 in

A 1502 –48 cm / 25 in

Max. conductor diameter

A 1501 –7 cm / 2,7 in

A 1502 –14 cm / 5,5 in

Nominal current range

30 A / 300 A / 3000 A ac rms,

with current crest factor 3

Effective measuring range

30A range: 3 A …45 A

300A range: 15 A …450 A

3000A range: 80 A …4500 A

3,5

Maximal current

60 A / 600 A / 6000 A of pure sinus current

Bandwidth

10 Hz …8 kHz

Accuracy

±1.2 % of reading

2,3

Position sensitivity

±1 % of nominal current range

Temperature dependency

+/-0.01 % of reading / ºC

Residual current (noise)

30A range: 0.12 A

300A range: 0.3 A

3000A range: 3 A

Phase error

<0.2°@ 50 Hz

<3°@1.5 kHz

External magnetic field

rejection in reference to

adjacent conductor

Min. 40 dB ( < 1% of adjacent conductor current)

Electrical Safety

Double insulation

EN 61010 –CAT III / 1000 V up to 3000 m

Pollution degree

Working and storage

temperature range:

Flexible current sensor: -20 …85 ºC

Other clamp parts: -20 …70 ºC

Humidity

95 % RH (0 C …40 C), non-condensing

Weight of flexible sensor

A 1501 –< 150 g

A 1502 –< 170 g

Water and dust proofing

IP 65

1. Limits of bandwidth corresponding to a relative gain > - 3 dB

2. Reference conditions:

Frequency 50/60 Hz;

conductor is in the centre and perpendicular to the current clamps;

temperature 23 ºC;

Clamps connected to MI 2892 Power Master;

Laboratory environment.

3.   󰇡

 󰇢





4. Adjacent conductor ≥ 20 cm from current clamps.

5. With accuracy: ±5 % of reading from the MI 2892 Power Master in real

conditions (with position, residual current, and intrinsic errors included)

Flex current clamps A 1501, A 1502 and A 1503

7.1.1 Range 30A - Typical Characteristics

Figure 5: RMS Accuracy (50 Hz)

Figure 6: Phase error (50 Hz)

Figure 7: Frequency Accuracy (30Arms)

Figure 8: Phase error (30Arms)

0,00

0,20

0,40

0,60

0,80

1,00

1,20

1,40

0,1 1 10

Accuracy (% of m.v.)

RMS Current (A)

0,00

0,02

0,04

0,06

0,08

0,10

0,12

0,10 1,00 10,00

Phase error (degrees)

RMS Current [A]

-3,00

-2,50

-2,00

-1,50

-1,00

-0,50

0,00

0,50

20 200 2000

Accuracy (% of m.v.)

Frequency (Hz)

10 100 1000

Phase error (degrees)

Frequency (Hz)

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