Huazheng HZ-3220S User manual

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HZ-3220S
Transformer DC Resistance
Tester
User Manual
Huazheng Electric Manufacturing (Baoding) Co., Ltd

Dear use r:
Thank you for cho os in g HZ-3 22 0S Transformer DC Re si st ance Tester.
We hope that this instrum ent can mak e your wo rk easier an d mo re
enjoyable, so that you ca n get the fe el in g of office automation in the test
and ana ly si s work.
Before using the instrument, please read this man ua l, an d operate and
maintain the instru ment ac cord in g to th e man ua l to pr ol ong its servi ce life .
"Just a lig ht press, the test wi ll be compl eted automati cally" is th e
operating chara ct eristi cs of this instrum en t.
If you ar e sat isfied wi th th is instrum en t, please tell you r colleagues;
if you ar e not satisfie d with this instrum ent, please call (03 12 ) 6775656 to
tell you to serve you at all times- Baoding Hu azheng Electric Manufactur ing
Co. , Ltd., our company will def in itely make you sati sf ied !

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Contents
I.Overview.......................................................................................................................................... 1
II.Precautions.....................................................................................................................................1
III.Performance characteristics.......................................................................................................2
IV.Main technical indicators............................................................................................................ 2
V、Instructions..................................................................................................................................2
VI、Test and wiring method............................................................................................................7
VII、Precautions............................................................................................................................... 9
VIII、After-sales service.................................................................................................................. 9

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I.Overview
The DC resistance of transformers is a must-test item for semi-finished products and
finished products factory test, installation, handover test and preventive test of the power
department in the manufacture of transformers. It can effectively discover the material
selection, welding, loose connection of the transformer coil, missing strands, broken wires,
etc. Defects and hidden dangers after operation. In order to meet the needs of rapid
measurement of transformer DC resistance, the instrument adopts new power supply
technology, which has the characteristics of small size, light weight, and large output
current. The whole machine is controlled by a single-chip microcomputer, which
automatically completes the functions of self-inspection, data processing, and display, and
has automatic discharge and discharge indication functions. The instrument has high test
accuracy and simple operation, which can realize the rapid measurement of transformer
direct resistance.
The HZ-3220S DC resistance tester is specially designed for temperature rise
measurement of three-core five-column large transformers. The charging and
measurement speed is fast, and it can meet the time requirements of the transformer
temperature rise test. Dual-channel measurement, real-time sampling, print output, Make
the temperature rise test no longer a problem.
II.Precautions
1. Be sure to read this manual carefully before using this instrument.
2. The operator of the instrument should have common sense in the use of general
electrical equipment or instruments.
3. The use of this instrument should be avoided in places such as rain, corrosive gas,
excessive dust, high temperature, and direct sunlight.
4. The meter should avoid severe vibration.
5. The maintenance, care and adjustment of the instrument should be carried out by
professionals.
6. After the test, be sure to wait for the discharge alarm to stop before turning off the
power and remove the test line.

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7. When measuring the no-load voltage-regulating transformer, switch the gears after the
discharge indication alarm sound stops.
8. During the test, it is forbidden to move the test clip and power supply line.
III.Performance characteristics
1. The instrument has large output current and high voltage.
2. Dual-channel measurement, measuring two resistance values at the same time.
3. It has a complete protection circuit and strong reliability.
4. Horizontal structure, convenient for on-site operation of transformer factory.
5. With sound discharge alarm and clear discharge indication, reduce misoperation.
IV.Main technical indicators
1.Output current：<15mA、1A、2.5A、5A、10A、20A、15mA+1A、15mA+2.5A、15mA+5A、
15mA+10A
2.Range：200μΩ～2Ω （20A）
400μΩ～4Ω （10A）
800μΩ～8Ω （5A）
2mΩ～16Ω （2.5A）
4mΩ～40Ω （1A）
10Ω～20kΩ （<15mA）
3.Accuracy：±(0.2%+2 words)
4.Resolution：0.1μΩ
5.Working temperature：0～40℃
6.Environmental humidity: ≤90%RH, no condensation
7.Power supply：AC220V±10%，50HZ±1HZ
8.Dimensions：440mm*240mm*390mm
9.Net weight：15KG
V、Instructions
1.The front panel of the instrument is shown in Figure 1.

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Figure 1
(1) Switch: This switch is the power switch. Press I to turn on, and O to turn off.
(2) Display: 800×480 dot matrix liquid crystal display, display menu and measurement
results.
(3) Printer: Print test results.
2.The rear panel of the instrument is shown in Figure 2.
Figure 2
（1） ： The grounding pole is used for the grounding of the instrument shell
and is a protective ground.
（2）Power supply: 220V alternating current input port, power supply to the whole
machine, power supply specification AC220V±10%，50Hz。
（3）I1+、I1-：large current output terminals.
（4）I2+、I2-：<15mA current output terminal
（5）V１+、V１-：Channel 1 voltage input terminals.
（6）V２+、V２-：Channel 2 voltage input terminal, <15mA voltage input terminal
A、Turn on the power switch, the boot interface is as follows：

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Test product information Press the button to input the information and then press
the input to complete.
1. Current level Press the two buttons and to select the current between
current <15mA, 1A, 2.5A, 5A, 10A, 20A, 15mA+1A, 15mA+2.5A, 15mA+5A, 15mA+10A.
Among them, 15mA+1A, 15mA+2.5A, 15mA+5A, 15mA+10A are used on the high voltage
side of the transformer. When the low voltage side is measured at the same time, the high
voltage side uses 15mA and the low voltage side uses the high current gear.
Channel selection Press the two buttons and B to select between channel 1,
channel 2, dual channel,
Press the two buttons and to select the high voltage phase.
Press the two buttons and to select the low voltage phase.
The temperature rise time can be selected between 15s, 30s, 45s, 60s by pressing the
two buttons and B.
The converted temperature is 20.0 (Cu), 75.0 (Cu), 90.0 (Cu), 115.0 (Cu), 120.0 (Cu),
145.0 (Cu), 20.0 (Al), 75.0 (Al) by pressing the two buttons and , 90.0 (Al),
115.0 (Al), 120.0 (Al), 145.0 (Al) to choose between,
Winding temperature press to enter the temperature and press confirm,

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Tap position press to input tap position and press confirm
B、Click the "Start Test" button to enter the test, the interface displays as follows：
C、Test result, the display interface is as shown in the figure below：
Press the "Local Storage" button for data storage,
Press the "U disk copy" button to store in U disk,
Press the "Print Data" button to print the test results,
Press the "Exit Test" button to exit the test and return to the boot interface.
D、

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When selecting the temperature rise time for measurement, after selecting the time, press
Start Test to enter the following interface,
First press the "Start Timer" button according to the prompt, and then press the "Start Test
Current" button according to the prompt. Enter the measurement interface
E、Press the "Data Query" button to enter the interface as shown in the figure below
Press the "U disk copy" button to store in U disk,
Press the "Back to Homepage" button to exit the data query interface and return to the
boot interface.
Press the "Print Data" button to print the current group data
Press 、the two buttons to query the previous and next data
Press the "Memory Management" button to enter the interface as shown below

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Press the "Delete this group" button to delete the current group of data
Press "Delete All" button to delete all stored data
Press the "Cancel Delete" button to return to the data query interface
F. When the temperature rise measurement is selected, the test results are automatically
printed according to the selected temperature rise time.
VI、Test and wiring method
The connection between the machine and the test product: connect the test product to the
test terminal of the machine through a dedicated cable, and the connection is firm, and the
ground wire is connected.
a、The wiring method of single-channel measurement is shown in the figure below.
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V2+
I2+
a b c
Single channel measurement wiring diagram
V1+
I1-
V1-
I1+
V2+
I2-
O
C
B
A

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b、The wiring method of dual-channel measurement is shown in the figure below
I2+ I2-
a b c
Dual-channel measurement of high-voltage RAO, low-voltage Rac wiring diagram
c、Refer to the figure below for the wiring of the magnetic assist method (applicable to
Y(N)-d-11 connection group).
I2+ I2-
a b c
Wiring method for measuring low voltage Rac and high voltage RAO
I1-
V1+
V1-
I1+
V2-
V2+
O
C
B
A
I1-
V1+
V1-
I1+
V2+
V2-
O
C
B
A

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VII、Precautions
1.You must wait for the discharge to end and the alarm sound stops before removing the
wire, otherwise it is dangerous.
2. When measuring the no-load tapping transformer, the discharge must be reset before
tapping, and the tapping point can only be switched after the alarm stops.
3. Refer to the test range when selecting the current, and must not use over range or
under range. When using over-range, the instrument is always in the "charging" state
because the current cannot reach the set value.
4. Pay attention to the range when using the magnetic method. Because the high-voltage
coils are connected in parallel and in series, 1.5 times the resistance of the high-voltage
coil is added to the entire test loop, which should be included when selecting the range. If
the output current cannot reach the set value or the output current is unstable if the range
is exceeded.
5. When the short contacts of the three wires of the magnetic assist method are removed
after the discharge is completed, there may be residual current, and may spark and
discharge when removed, which is a normal phenomenon.
VIII、After-sales service
The instrument will be repaired free of charge for product quality problems belonging
to the company within one year from the date of purchase, and lifetime warranty and
technical services will be provided. If you find any abnormalities or malfunctions in the
instrument, please contact the company in time to arrange the most convenient solution
for you and provide you with the fastest on-site service.