Unit UT279 Manuel utilisateur

110401112106X

Contents

Safety Information ................................................................................................. 1

I. Introduction............................................................................................... 2

II. Electrical Symbols .................................................................................... 3

III. Technical Specifications ........................................................................... 4

IV. External Structure..................................................................................... 6

V. Operating Instructions .............................................................................. 7

1ˊPower On/Off ............................................................................................ 7

2ˊData Measurement ................................................................................... 7

3ˊClock Setting............................................................................................. 8

4ˊData Storage............................................................................................. 8

5ˊData Viewing............................................................................................. 8

6ˊTested Object Numbering ......................................................................... 8

7ˊData Deletion ............................................................................................ 8

8ˊTouchscreen Calibration ........................................................................... 9

9ˊPower-off Time Setting.............................................................................. 9

10ˊAlarming Setting ..................................................................................... 9

11ˊCurrent Waveform Testing..................................................................... 10

12ˊMonitoring in Real Time ........................................................................ 11

13ˊData Downloading ................................................................................ 12

VI. Battery Replacement.............................................................................. 12

VII. Packing List............................................................................................ 13

Safety Information

Thank you for buying this product, for better use of it, please be sure of the

followings:

Read the user manual carefully.

Follow all operating precautions in the user manual.

Pay special attention to safety use in any case.

Note the labels, texts and symbols at the tester.

If the battery power is low, the tester will keep rebooting, please replace

battery.

Do not test circuit with voltage over 600V.

It is forbidden to use without rear cover and battery cover closed well.

In case that the case or test lead cracks and then cause exposed metal

during use, please stop use immediately.

Please do not place and keep the tester in places with high

temperature/humidity, dews and direct sunlight for an extended period of time.

Maintain and clean the tester and current clamp in a regular basis, do not

wipe them with corrosives and coarse materials.

Avoid the iron core of current clamp from deforming, deformed iron core will

affect testing accuracy.

Please note the battery polarity when replacing battery, and remove the

battery if not used for a long time.

Use, disassembly and repair must be performed by authorized eligible

personnel.

If danger may occurs due to the tester, please stop using the tester and seal

it, then send it to authorized qualified agency for maintenance.

The symbols “ ” at the tester and user manual represent danger warning,

indicating user must perform safe operation according to the warnings.

The symbol “ ” in the user manual represents warning of super danger,

indicating user must perform safe operation according to the warnings.

I. Introduction

UT279 Transformer Grounding Current Tester is designed and manufactured to

perform on-line test on the grounding current and the leakage current of

transformer iron core in power system on site, the tester is designed with current

clamp, monitoring software, communication line, etc. The transformer is an

important electrical equipment in the power system, if the transformer is

malfunctioned, that will cause severe consequence to the power system. The

transformer iron core under normal operation is grounded in the way of single point,

if grounded in the way of two or multiple points, current loop will occur between the

iron core and the ground, the maximum current in the loop can reach several tens

of amperes, which will cause partial area of the iron core to be overheated or even

burnt. The tester can find out potential fault in transformer, which makes it an ideal

tool to ensure safe operation and daily maintenance of transformer. The tester is

capable of resisting interference, applicable in environment with strong magnetic

field near transformer, mainly used for leakage current test performed on the “clamp”

(a device to fix the iron core of electrical equipment) and electrical equipment such

as transformer, electric reactor and others in transformer station and power

generating plant. The tester also applies to current test and leakage current test of

circuits or equipment in electric power, communication, meteorology, railway, oil

field, architecture, metrology, scientific research and teaching institute, industrial

and mining enterprises, and other fields.

The tester is designed with high-speed microprocessor and 3.5-inch color touch-

screen LCD, enabling smart touch operation and easy use, it can display the value

and waveform of measured current in real time. With FFT, digital filtering and other

technologies employed, the tester makes measured data more accurate. UT279

has multiple functions such as alarming threshold setting and warning indication,

data & time and “Setting”, auto power off, setting of numbering of tested object, it

is able to save 200 sets of data and waveforms, the stored data can be imported

to computer via the USB interface of the tester.

As the iron core of current clamp is made with permalloy and magnetic shielding

technology, it is not susceptible to influence and interference from external

magnetic field, ensuring continuous measurement of high accuracy, stability and

reliability. The internal diameter of the clamp jaw is 80mm×80mm, which allows it

to clamp cable or grounding wire of  80mm below, or 96mm×4mm grounding wire

of flat steel. The clamp jaw features portable design and realizes non-contact, safe

and rapid measurement without the circuit under test disconnected.

The monitoring software has multiple functions such as on-line monitoring in real

time, data viewing, data storage, data printing, dynamic display, waveform

indication, alarming threshold setting, alarm indication, and more.

II. Electrical Symbols

Super dangerous! The user must stringently

observe the safety

regulations, otherwise it may pose a risk of shock and cause personal

injury and death.

Danger! The user must stringently observe the safety regulations,

otherwise it may pose a risk of shock and cause personal injury and

death.

Warning! The user must stringently observe the safety regulations,

otherwise it can cause personal injury or damage to equipment.

Double insulated

Alternating current (AC)

Direct current (DC)

III. Technical Specifications

Function Grounding current test, AC leakage current on-line test, AC

current on-line test.

Power supply

DC 9V alkaline dry battery (LR6 1.5V×6)

Testing mode

Clamp-shaped CT

Jaw size 80mm×80mm (The jaw can clamp  80mm lead, or

96mm×4mm grounding wire of flat steel)

Current range

AC 0.00mA~100A

Resolution

AC 0.00mA~0.99mA; resolution: 0.01mA

AC 1.0mA~99.0mA; resolution: 0.1mA

AC 100mA~999mA; resolution: 1mA

AC 1.0A~100.0A; resolution: 0.1A

Accuracy

±(0.5%+5dgt)

23°C±3°C, 70%RH, test lead is centered within the clamp

jaw.

Frequency

range

10HZ~1000HZ

Display mode

3.5-inch color touch-screen LCD (320dots × 240dots)

Operating

mode

Smart touch and button control

Tester

dimension

198mm×100mm×45mm

Current clamp

dimension

194mm×145mm×40mm

Weight

Tester: 450g (battery included); current clamp: 780g

LCD size

Display area: 71mm×53mm

Electromagne

tic

interference

When the current clamp induces electric field of 100A at a

distance of 10mm, induced current of 10mA will be generated.

Sampling rate

Once per second

Data storage 200 sets of data (Data will not be lost when battery is replaced

or power is down)

Date and

clock

Date and clock displays, clock setting

Tested object

numbering

Setting of numbering of test points

Auto power

off

The tester will power off automatically after it is started up after

5 minutes by default.

Touchscreen

calibration

The tester has function of touchscreen calibration.

USB interface The tester has a USB interface, via which the stored data in

tester can be imported to computer.

Alarming

setting

Alarming threshold range: 10mA~99.99A

Alarming

indication

The LCD flashes and the buzzer sounds when the tested

value exceed the alarming threshold.

Voltage of

tested circuit

AC 600V

Overrange

indication

“OL” is displayed

Battery

voltage

When battery voltage drops to 7.2V±0.1V

, the low battery

symbol will be displayed, indicating battery replacement. The

measured data is accurate under low battery condition.

Rated current

180mA at most

Lead length

2 meters

Operating

temperature &

humidity

-10°C~40°C; 80%rh

Storage

temperature &

humidity

-10°C~60°C; 70%rh

Insulation

strength

AC 2kV/rms (between screw and casing)

IEC1010-1, IEC1010-2-032, Pollution Class 2, CAT 600V,

IEC61326 (EMC standard)

IV. External Structure

1. Connector for current clamp 2. USB interface

3. 3.5-inch color touch-screen LCD 4. Tester

5. ĹĻĸĺ button and MEM button 6. POWER button

7. Coil tap 8. Coil tap

9. Shielded layer 10. Audio plug

11. Output lead 12. Current clamp

13. Trigger

V. Operating Instructions

1ˊPower On/Off

When POWER is pressed, the tester will be turned on and the LCD will display the

menu. If blank screen occurs and the LCD keeps flashing after the tester is turned

on, that indicates the battery power may be low, please press POWER to turn off

the tester and then replace the battery. The time of powering off the tester

automatically can be set, the time range is 000 to 999(min), if the time is set at

“000”, the tester will not power off automatically. The tester will power off

automatically after it is turned on for 5 minutes by default.

2ˊData Measurement

In function menu page, press ĸĺ to move the cursor to “Data Measurement” icon,

and press MEM or tap “Data Measurement” icon to enter data measurement page,

then press ĹĻ to move the cursor to “Return” icon, next, press MEM or tap “Return”

icon to return to function menu pate.

Menu Data measurement

3ˊClock Setting

In function menu page, press ĸĺ to move the cursor to “Clock Setting” icon, and

press MEM or tap “Clock Setting” icon to enter clock setting page, press ĸĺ or

tap “” icon to move the cursor to year, month, day, hour, minute, press ĹĻ or

tap “” icon to adjust date and time. Press ĹĻ to move the cursor to “Return” icon,

then press MEM or tap “Return” icon to return to function menu page.

4ˊData Storage

In data measurement page, when pressing ĸor tapping “Data Storage” icon, the

tester will enter data storage status and the LCD will display “NO.XXXHD”, the

tester stores the current, waveform, time, tested object numbering to the memory,

“NO.XXX” represents the number of groups of stored data, press ĸagain or tap

other icons to exit.

5ˊData Viewing

In function menu page, press ĸĺ to move the cursor to “Data Viewing”, then

press MEM or tap “Data Viewing” icon to enter data viewing page, press ĹĻ to

scroll through data. Press ĹĻ to move the cursor to “Return” icon, then press MEM

or tap “Return” icon to return to function menu page.

6ˊTested Object Numbering

In function menu page, Press ĸĺ to move the cursor to “Tested Object

Numbering” icon, then press MEM or tap “Tested Object Numbering” icon to

enter the page of tested object numbering, press ĸĺ or tap “” icon to move

the cursor, press ĹĻ or tap “” icon to change the numbering of tested object, press

ĹĻ to move the cursor to “Return” icon, then press MEM or tap “Return” icon to

return to function menu page.

7ˊData Deletion

In function menu page, press ĸĺ to move the cursor to “Data Deletion” icon, then

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