HVTest HTZZ-2A Manuale utente

Dear Client

Thank you for Purchasing our HTZZ-2A Transformer DC

Winding Resistance Tester. Please read the manual in detail prior

to first use, which will help you use the equipment skillfully.

Our aim is to improve and perfect the

company's products continually, so there may be

slight differences between your purchase equipment

and its instruction manual. You can find the changes

in the appendix. Sorry for the inconvenience. If you have further

questions, welcome to contact with our service department.

The input/output terminals and the test column

may bring voltage, when you plug/draw the test wire or

power outlet, they will cause electric spark. PLEASE

CAUTION RISK OF ELECTRICAL SHOCK!

Company Address:

T4，No. 41, High-tech 2 Road，East Lake High-tech Development Zone，

Wuhan

Sales Hotline: 86-27- 87457960

After Service Hotline:86-27- 87459656

Fax: 86-27- 87803129

E-mail: [email protected]

Website: www.hvtest.cc

SERIOUS COMMITMENT

All products of our company carry one year limited warranty

from the date of shipment. If any such product proves defective

during this warranty period we will maintain it for free. Meanwhile

we implement lifetime service. Except otherwise agreed by

contract.

SAFETY REQUIREMENTS

Please read the following safety precautions carefully to avoid

body injury and prevent the product or other relevant subassembly

to damage. In order to avoid possible danger, this product can only

be used within the prescribed scope.

Only qualified technician can carry out maintenance or repair

work.

--To avoid fire and personal injury:

Use Proper Power Cord

Only use the power wire supplied by the product or meet the

specification of this produce.

Connect and Disconnect Correctly

When the test wire is connected to the live terminal, please do

not connect or disconnect the test wire.

Grounding

The product is grounded through the power wire; besides, the

ground pole of the shell must be grounded. To prevent electric

shock, the grounding conductor must be connected to the ground.

Make sure the product has been grounded correctly before

connecting with the input/output port.

Pay Attention to the Ratings of All Terminals

To prevent the fire hazard or electric shock, please be care of

all ratings and labels/marks of this product. Before connecting,

please read the instruction manual to acquire information about the

ratings.

Do Not Operate without Covers

Do not operate this product when covers or panels removed.

Use Proper Fuse

Only use the fuse with type and rating specified for the product.

Avoid Touching Bare Circuit and Charged Metal

Do not touch the bare connection points and parts of energized

equipment.

Do Not Operate with Suspicious Failures

If you encounter operating failure, do not continue. Please

contact with our maintenance staff.

Do Not Operate in Wet/Damp Conditions.

Do Not Operate in Explosive Atmospheres.

Ensure Product Surfaces Clean and Dry.

－Security Terms

Warning: indicates that death or severe personal injury may

result if proper precautions are not taken

Caution: indicates that property damage may result if proper

precautions are not taken.

Contents

I. Overview................................................................................................. 6

II. Application............................................................................................. 7

III. Performance characteristics..............................................................7

IV. Specifications.......................................................................................8

V. Panel Layout....................................................................................... 10

VI. Working Principle.............................................................................. 10

VII. Operation Methods..........................................................................11

VIII. Problems and Solutions................................................................ 14

IX. Notes................................................................................................... 14

I. Overview

DC resistance measurement of transformer winding is an

essential test project during transformer transfer, repair and

changing tapping switch. Measuring DC resistance of transformer

winding, you can check out weld or connection quality of down-lead,

the winding inter-turn short circuit or open circuit, and whether

tap-changer is well contacted. In the previous it is generally to use

QJ44 double bridge to measure DC resistance, but the measuring

current for this type of bridge is mA level current. So measurement

will take a long time, and accuracy is lower. In order to change the

above situation, our company has developed this product.

This instrument is a high-precision regeneration product used

to replace DC single/double bridge. Equipped with advanced switch

power supply technology, the measurement speed of the

instrument is faster a hundred times than that of the bridge. Using

four and half bits LCD to display the measurement results and

three and half bits LCD to display ambient temperature or test

current value, it overcomes the shortcoming of other similar

products that it is difficult to read value from the LED display in the

sun and possesses automatic arc suppression function. The

instrument is characterized by fast test speed, high precision,

intuitive display, strong anti-interference ability, small size, low

power consumption, stable and reliable test data. Built-in

rechargeable battery pack (14.8V) and AC/DC dual-use, the

instrument is very convenient for on-site and field test.

The instrument meets DLT 845.3-2004 "resistance

measurement device general technical requirements- Part 3 DC

Resistance Tester" requirements.

II. Application

The instrument is an ideal device to measure different

inductive load DC resistance and of low-voltage switch contact

resistance, wire and cable resistance, welded joint resistance of

power transformers, large motors and instrument transformers.

III. Performance characteristics

1. Fast test: The maximum output charge current of the

instrument is up to 2A. When measuring it can effectively

compensate current inertial for large inductor and accelerate core

saturation, thereby reduced the charging time and increased test

speed. Its test speed is faster hundreds of times than the traditional

single instrument and double bridge.

2. High accuracy: The application of advanced four-terminal

measurement and constant current source technology to the

instrument makes the inductive load charging current hold a

relatively stable value. Base on that, and the instrument with stable

anti-sense capability and strong anti-interference characteristics

can ensure the accuracy of measurement. And the use of imported

high-quality components not only improves the measurement

accuracy, but also makes the instrument have good repeatability.

3. Wide measurement range: resistance measurement range

1μΩ ~ 20KΩ, wide range.

4. AC and DC power supply: Attached rechargeable battery,

the instrument can use AC and DC power supply. Portable design,

it is easy to carry and use.

IV. Specifications

1. Work Environment:

Temperature: 0℃～40℃

Relative Humidity: ≤85 %RH

2. Measurement Range:

The instrument has seven ranges as follows:

1μΩ～20mΩ;

20mΩ～200mΩ;

0.2Ω～2Ω;

2Ω～20Ω;

20Ω～200Ω;

200Ω～2kΩ

2kΩ～20kΩ

3. Measurement Accuracy：±(0.2%+2d)

4. Maximum Resolution: 1μΩ

5. Constant current source:

2A (1μΩ～20mΩ, 20 mΩ～200mΩ, 0.2Ω～2Ω);

200mA (2Ω～20Ω);

10mA (20Ω～200Ω);

1mA (200Ω～2kΩ)

100uA（2kΩ～20kΩ）

6. Working Voltage:

DC: 12V～16.8V

AC: 220V

7. Power Dissipation: ≤15W

8. Dimension: 365×330×180mm3

9. Weight：5kg (included test clamp and test lead)

V. Panel Layout

Picture 1 panel layout

1. resistance range select

2. resistance

3. Tem/current

4 .Tem sensor

5.Tem/current select

6. test line jack

7 .working status

8 .start/stop

9 .power switch

10 .power indicator

11. 220V plug

12. ground

VI. Working Principle

There is a constant current source in the instrument that can

supply DC current. When measuring resistance, constant current

be fed into the tested object from terminals I +, I-, then which will

yield voltage in the tested object, the value of that voltage retake to

Indice

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