Unit UT255A Manual de usuario

P/N:110401103626

Contents

TITLE PAGE

Warning 3

I. Introduction 6

II. Electrical Symbols 8

III. Model Comparison 9

IV.Technical Specifications 10

V. Meter Description 14

VI. Display Mode 16

1. LCD Display 16

2. Special Icon Description 17

3. Display Examples 18

VII. Operating Instructions 21

1. Measuring Instruction 21

(1) Power On/Off 21

(2) General Measurement 22

2 3

TITLE PAGE

(3) PEAK Measurement 28

(4) Data Hold 29

(5) Data Save 29

(6) Data Access 30

(7) Data Delete 30

*(8) Data Transmission 30

2. Receiving Instructions 31

(1) Power On/Off 31

(2) Data Receive 32

(3) Data Hold 32

(4) Data Save 32

(5) Data Access 33

(6) Data Delete 33

VIII. Battery Replacement 34

IX. Packing List 36

Warnings

Thank you for purchasing UNIT series high voltage clamp ammeter.

In order to use the product properly, please follow instructions below:

-----Read this manual carefully and the operator is required to fully

understand the manual and operate skillfully before beginning

on-site tests.

-----Strictly observe safety rules and notes mentioned in this manual.

4 5

6 7

I. Introduction

High voltage clamp ammeter stands out from traditional concept and is

especially designed for on-line measurement on current, leakage current of

high-voltage lines and determining working status of zinc oxide arrester. It is

supported by latest CT and screening technologies and made up of exclusively

high-voltage tester and high-voltage insulation rods. UT255B, in particular can

offer wireless data transmission function and be equipped with wireless

receiver that allows it to straightly receive data within 20 meters. The meter is

also used as kinds of low-voltage leakage current clamp tester and

amperemeter that are capable of accuracy up to 0.01mA .You had better to

use wireless transmission model when focusing on measuring extremely

small flow of leakage current or current and at the same time offered with

timely data display.The design to integrate both clamp jaw and guide zone

ensures this kind of meter to enjoy high accuracy, reliability and stability all

the year around, and it is offered with insulation rods with outstanding

With the insulation rod, the meter can measure leakage current in high-

voltage lines below 60kV and on-line current, and identify if zinc oxide

arrester is moisture-affected or not. There are also other functions provided

for the meter: peak value hold, data hold, data save and wireless data

transmission. Given the condition that high-voltage clamp can be easily

connected or disconnected to measured lines with the help of insulation rods,

so the meter can be widely used in transformer station, power plant, mining,

inspection center, electrician maintenance and repairing center for conducting

leakage current testing and outdoor electrical operation.

This kind of meter is also used as high/low-voltage current transformer

ratio tester and zinc oxide arrester meter, that is to say it can respectively

measure two times of loop current of current transformer and then calculate

features such as moisture proof, high temperature resistance, anti-strike and

bending, high insulation, extendibility ,ect.

8 9

the ratio or reduced ratio. One thing to mention is: under general circumstances,

considering the leakage current should be lower than 500uA for a running

arrester, the meter can tell us the working status of the arrester. If checked

out with leakage current higher than 500uA, the arrester may have been

contaminated, moisture-affected or experienced aging, because the higher

flow of leakage current it is, the more severe phenomena above are.

II. Electrical Symbols

Extreme danger! To avoid personal injury or accidents in case of

electric shock, observe safety rules strictly.

Danger! To avoid personal injury or accidents in case of electric

shock, please follow safety notes.

Warning! Confirm to the safety instructions, otherwise it may cause

personal injury or damage to the meter.

Alternating Current AC

Direct Current DC

UT255A 10uA 600A 10uA 33mm

III. Model Comparison

Model Range Resolution Jaw Size Notes

General Type

Special, with

wireless

transmission

function

UT255B 10uA 600A 10uA 33mm

under general circumstances

10 11

IV. Technical Specifications

To measure high-and low-voltage AC leakage current

and on-line current; indirectly obtain ratio of current

transformer

DC6V Alkaline dry battery 1.5V AAA 4

Clamp-type CT, integral mode

UT255B 433MHz wireless transfer up to about 20

meters

4- digit LCD display, backlight, suitable on dark sites

47mm 28.5mm

Functions

Power

Measuring Mode

*Transmission mode

Display Mode

LCD Size

Dimensions

High-voltage tester (wide high thick): 68mm

245mm 40mm

UT255B Receiver (wide high thick): 75mm

170mm 30mm

33mm

2 times per second

AC 0.01mA 600.0A 50/60Hz auto

10uA

0.01mA 600A automatically switch

Jaw Opening

Sampling Rate

Measuring Range

Resolution

Function Switchover

0.01mA 100.0A: 1% 5dgt

100.0A 200.0A: 2% 5dgt

200.0A 600A: 3% 5dgt

Accuracy

23 5

80%RH

Max.99sets, MEM icon displays during storing,

FULL icon shows if fully save

Automatically hold peak values, Press PEAK button

under general measuring mode to start, indicated by

peak light, repress to switch off

Data Save

PEAK Hold

To measure line voltage below 60kV operate with

insulation rod

Press HOLD button to hold data under general

measuring mode, indicated by HOLD icon, then

repress to cancel the operation.

Line Voltage

Data Hold

Out of-range display: indicated by OL A icon

Dynamic display of no- - icon when receiving no

signal

15 minutes later after power on, to conserve power

energy

Indicated by MR icon able to scroll up or down

to read out data

Low battery icon displays with voltage lower

than 4.8V, please timely change the battery

Data Access

Overload Display

* Display for no signal

Auto Power Off

Battery Voltage

Tester 335g battery included ; total weight

2.5Kg insulation rod and battery included

Weight

Storage

Temperature/ Humidity

Operating

Temperature /Humidity -20 40 ; 80%Rh

-20 60 ; 70%Rh

No 315MHz, 433MHz shared frequency interference

32mm, 1m per piece 5PCS

*Interference

Insulation Rod

Insulation strength between fifth insulation rod and

tester housing: AC 100kV/rms; between tester

housing and iron core: AC1000V/rms

Leakage resistance type

Insulation Strength

Structure

12 13

14 15

V. Meter Description

1. Clamp Jaw (Guide zone included)

2. UT255A Tester

3. LCD Display

4. PEAK Measuring Indication

5. PEAK Button

6. POWER Button

7. HOLD Button

* 8. UT255B Receiver

9. Insulation Rod connection Terminal

*10. POWER Indication

*11. UT255B tester

12. Insulation Rod (5 Pcs)

16 17

VI. Display Mode

1. LCD display

. AC icon

. Low battery icon

. Data Save Display

. Data Access Display

. 2-digit serial numbers

for data save

. Unit Icon

. Data hold Display

. Decimal Point

. 4-digit LCD Display

. Low battery displays with voltage lower than 4.8V, please change

batteries timely.

. OL A icon indicates measured current is out of limit.

. MEM icon displays during data save process.

. FULL icon flashes when maximum value of 99sets are achieved,

indicating no save operation any more.

. MR icon displays together with saved data serial numbers during data

research.

. End is to indicate exiting the process.

. dEL indicates during data delete process.

* . no- - dynamically indicates no signal is received; it is likely the tester

is not under testing mode, or being adjusted for right receiving place and

distance.

2. Special Icon Description

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