Huazheng HZJD-2 User manual

HZJD-2
Insulating Oil Dielectric Loss And
Resistivity Tester
Huazheng Electric Manufacturing (Baoding) Co., Ltd

Dear user:
Thank you for choosing HZJD-2 Insulating Oil Dielectric Loss And Resistivity Tester.
We hope that this instrument will make your work more relaxed and enjoyable, and
make you feel office automation in your test and analysis work.
Before using the instrument, please read this manual, and operate and maintain the
instrument according to the manual to extend its service life.
"Just press lightly, the test will be completed automatically" is the operating
characteristic of this instrument.
If you are satisfied with this instrument, please tell your colleagues; if you are
dissatisfied with this instrument, please call [phone] and tell us-Baoding
Huazheng Electric Manufacturing Co., Ltd., our company will definitely satisfy you!
Contents

I.OVERVIEW .........................................................................................................................1
II.The main functions and features ..................................................................................1
III.MAJOR TECHNICAL INDICATORS ...........................................................................2
IV.USE CONDITIONS ....................................................................................................... 2
V.PANEL DESCRIPTION AND OPERATION MATTERS NEEDING ATTENTION .2
VI.OPERATION APPROACH ...............................................................................................5
Ⅶ.OIL CUP INTRODUTION ...............................................................................................10

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I.OVERVIEW
Insul ation Oil Di ss ip atio n Fac tor and Re si stivit y Measuring Sys tem DTL, is
designed and manufactured based on GB/T5654-2007 of《Liquid insulating material of relative
permittivity, dielectric loss factor and DC resistivity measurements》. It is used for measuring
dielectric dissipation factor and DC resistivity of insulating oil and other insulating liquids. The
instrument is characterized by integrated structure, and integrates test cell, temperature
controller, temperature sensor, dielectric loss test bridge, AC test power, standard capacitor,
high resistance meter, DC high voltage source and other major components. The instrument
adopts full digital technology and all of the intelligent automatic measurement, is equipped with
large colcor screen (800*480) LCD display, which each step has prompted the Chinese, the test
results can be automatically stored and printed output, so that the operator without professional
training will be able to use it proficiently.
II.The main functions and features
1. The test cell used of the three-electrode structure in line with the national standard
GB/T5654-2007, with electrode spacing 2mm, can eliminate the effects of the stray capacitance
and leakage on dielectric loss test results. The apparatus is equipped with the oil drainage
solenoid switch, and we can empty the test cell in case of not removing it and rinse it with the test
sample.
2. The instrument adopts the medium frequency induction heating, PID temperature control
algorithm. This heating method has the advantages of t non-contact between the test cell and the
heating body, even heating, fast speed, convenient control, strict control of the temperature within error
range of the preset temperature.
3. Internal standard capacitor is SF6 gas-filled three-electrode capacitance, and its capacitor
dielectric loss and electrical capacity is independent of ambient temperature, humidity and other effects,
so that the instrument accuracy can be ensured even after prolonged use.
4. AC test power supply using AC-DC-AC conversion, effectively avoid the fluctuations in mains
voltage and frequency on dielectric loss measurement accuracy effect. Even a generator, the instrument
can work properly.
5. Perfect protection function; When there is over voltage、over current or high-voltage
short circuit, instruments can quickly cut off pressure, and issues a warning message. When the
temperature of the sensor failure or not connected, the instrument will also issue a warning
message.
6. There is a temperature limiting relay in the medium frequency induction heating furnace.
When temperature above 120 degrees, the instrument frees the relay and stops heating.
7. More convenient the experimental parameter is set. Temperature setting range 0～
120℃, AC voltage setting range 500～2000V, DC voltage setting range 300V～500V.
8. Using of large-screen LCD display, with backlight and clear display. Friendly interface, simply
follow the Chinese menu prompt, enter the command, the instrument can be automatically tested. And

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automatically store and print test results.
9. Built-in real-time clock, the test date and time may be saved, displayed and printed with the test
results.
10. Calibration functions of cleaned dry cell. The measurement of dry cell’s capacitance and
dielectric loss factor can determine its cleaning and assembly conditions. The calibration data is
automatically saved and so that it facilitates the calculation of relative permittivity and DC resistivity.
III.MAJOR TECHNICAL INDICATORS
Voltage supply: AC 220V±10%
Power frequency：50Hz/60Hz ±1%
Measuring range：
Electric capacity 5pF～200pF
Relative Permittivity 1.000～30.000
Dielectric loss factor 0.00001～100
DC Resistivity 2.5MΩm～20TΩm
Measuring accuracy：
Electric capacity ± (1% of measured value+0.5pF)
Relative Permittivity ±1% of measured value
Dielectric dissipation factor± (1% of measured value+0.0001)
DC Resistivity ±10% of measured value
Resolution：
Electric capacity 0.01pF
Relative capacitivity 0.001
Dielectric dissipation factor0.00001
Measured temperature range：0～120℃
Temperature measurement error：±0.5℃
Test Voltage AC(RMS)：500～2000V Continuously adjustable, frequency 50Hz
Test Voltage DC：300V～500V Continuously adjustable
Power consumption：100W
External dimensions：500×360×420
Total weight：22Kg
IV.USE CONDITIONS
Ambient temperature：0℃～40℃
Relative humidity(RH)：<75%
V.PANEL DESCRIPTION AND OPERATION MATTERS
NEEDING ATTENTION
1. Panel description

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Fig.1 Operating Panel
Fig.2 Top panel
Full touch display
USB Interface
Printer
Test probe

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Fig.3 Back panel
2. Instrument operating instructions and matters needing attention
⑴The instrument must be reliable grounding, power entrance lead into AC220V power.
⑵Open tank cover, and take out the test cell, we should shut the tank cover, when heating and testing
the dielectric loss.
⑶The cover is protective and when you open it, will interrupt the heating and high pressure.
⑷During the test, there is high pressure and high temperature. Do not contact the test cell, cable and
socket when the power is electrify and testing.
(5)If it appears dead stop faults phenomenon while testing, turn the system back on, and restart the
instrument.
Use the appropriate power supply cables.
Only use the product-specific power supply line in accordance with the product specification. Be right to
disconnect and connect.
The instrument must be adequately grounded.
In addition to the power line grounding conductor grounding, product shell’s grounding columns must be
grounded
In order to prevent electric shock, the grounding conductor must be connected with the ground.
Before connecting with the input or output terminals of the product, make sure that the product is
properly grounded.
Note that rating value of all terminals.
To prevent fire or electric shock hazard, please note that all rating values and markings in the product.
Before connecting this product, please read the product manual in order to further understand the
information about rating values.
Use the appropriate protective tube.
Use only the protective tube in accordance with provisions of this product type and rating.
Do not operate when there is any suspicion of failure. If you suspect this product is damaged, please
contact our repair staff to check, and do not continue the boot operation.

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Align the locating slot when the internal electrode into the external electrode.
Do not operate in humid environments.
Do not operate in explosive environments.
Keep the surface clean and dry.
Special notice: This instrument has high voltage output, improper use can compromise personal
safety, prior to the use of this instrument, be sure to read the instruction manual carefully!
VI.OPERATION APPROACH
1、Place the cleaned test cell in the groove, and connect the test cable as shown in Fig.2.
2、Start the instrument.
Turn on the power switch, and the LCD displays the main menu as shown in Fig.4.
Fig.4
3、Test Conditions
Enter “Test Conditions” parameter settings screen as shown in Fig.5.

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Fig.5
①Parameter range：Temperature：0~125℃
AC Voltage：500~2000V
DC Voltage：0~500V
②Method for setting parameters
Tap the display position and enter the parameters you want to set.
Tap the [Return] key, the instrument saves the set parameters and returns to the main menu.The
power-on instrument retains the last set parameters and does not need to be reset.
③Automatic print
Tap [Automatic Print] to turn automatic print on or off.If automatic printing is turned on, the printer
automatically prints the test results after each test is completed.
④time setting
The system clock can be corrected by tapping the time.
4、Dry Cell Calibration
Before entering the calibration, make sure that the test oil cup in the cup position is an oil-free empty oil
cup,and connect the test cable and temperature probe cable.Tap the [Dry cell calibration] button to enter
the calibration screen as shown in Fig.6,tap the [Start] button to perform the empty cup calibration test.

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Fig.6
①Since the temperature has no significant effect on the capacitance and dielectric loss factor of the
air-filled electrode cup, a lower test temperature can be set. It is recommended to set the temperature
to 10℃above room temperature.Tap the [Return] button to return to the main menu.
②Calibration result----After the empty cup calibration measurement is completed, the calibration result is
displayed in the screen of Fig. 7.At this time, tap the [Save] button to save the calibration result, and tap
the [Return] button to return to the main menu.
Fig.7
5、Automatic measurement

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Before entering the automatic measurement, make sure that the oil cup is filled with oil and that the test
cable is connected.Tap [Test] on the main interface to enter the automatic measurement screen, as
shown in Fig.8.
Fig.8
As shown in the above picture, there are 2 options.Tap the [dielectric loss factor dielectric constant]
button to turn the dielectric loss factor test on/off.Tap the [DC Resistivity] button to turn the DC resistivity
test on/off.After selecting it, tap the [Test] button, the instrument will automatically complete the selected
test item, and the experiment can be suspended or canceled during the test.
①Dielectric loss factor dielectric constant screen is shown in figure 9-1:
Fig.9-1

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②DC resistivity screen is shown in Figure 9-2:
Fig.9-2
③Test Results----After the test is over, the test results are displayed in the screen shown in Figure 10.If
the automatic print item is selected earlier, the printer automatically prints the test result.If there is no
automatic print item selected, tap the [Print] button and the printer will print the displayed test result.Tap
the [Return] button to return to the main menu.
Fig.10
6、Datascan
In the main interface, tap the [Datascan] button to enter the datascan screen as shown in Figure 11.

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Fig.11
The instrument screen displays the total number of pages and the current number of pages, up to 100
pages.Tap the [PgUp] and [PgDn] buttons to page up and down.Tap the [Delete] button to delete the
data of the currently displayed page.Tap the [Print] button to print the current page data. Tap the clear
button in the upper left corner to clear all test records, and tap the [Return] button to return to the main
menu.
Ⅶ.OIL CUP INTRODUTION
1、Oil cup structure

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Fig.12 Oil cup exploded view

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Fig.13 Oil cup assembly drawing
2、oil cup technical standards
The test cell used of three-electrode structure in line with the national standard of
GB/T5654-2007, with electrode gap spacing 2mm, can eliminate the effects of stray capacitance
and reducing leakage on the dielectric loss test results.
(1)1Distance between high voltage and low voltage 2mm
(2) Dry cell capacitance 60±5PF
(3) Maximum test voltage (power frequency) 2000V
(4) Dry cell dielectric loss tan δ＜1×10-4
(5) Liquid capacity about 40ml
(6) Electrode materialStainless steel
(7) Volume 70mm (D) × 120mm (H)
3、Loading and taking out the test cell
⑴Loading the test cell：Put the oil cup into the instrument furnace smoothly, ensure that the bottom
contact of the oil cup is good, and then connect the test line, the test probe is inserted into the test
sample cup.
⑵Taking out the test cell：After the test line is removed, the oil cup can be taken out..
4、Dismantling and assembling the test cell’s electrode
The inner electrode can be removed directly from the oil cup
Attention：Inner electrode is very precision components, when you take out and load it, actions must be
slow and steady. Do not collide between the internal and external electrode in case of damaging the
surface and causing the entire test cell scrapped.
5、Loading oil sample
Remove the inner electrode, pour the oil sample 40mL into the oil cup, and take care not to entrap

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bubbles in the oil as much as possible.
The inner electrode is then loaded into the oil cup and needs to be stationary for more than 15 minutes
so that the bubbles can be completely discharged before testing.
Try.
6、Cleaning the test cell
This step is important for the cleaning of the oil cup before measurement. Because insulating oil has
a very sensitive reaction to very small pollution. The following methodological elements must therefore
be strictly followed.
Method 1:
(1) Complete removal of oil cup electrodes;
(2) Wash with neutral soap or detergent. Abrasive particles and friction actions should not damage the
electrode surface;
(3) Wash the electrodes several times with clean water;
(4) Soak parts with anhydrous alcohol;
(5) After the electrode is cleaned, the surfaces of the electrode components are cleaned with silk fabrics,
and care is taken to place the parts in a clean container without contamination of the surface with dust
and moisture;
(6) Place the parts in an oven around 100 °C and dry them.
Method 2:
(1) Take the electrode cup apart(see the diagram of the oil cup).
(2) Thoroughly cleaning all parts of the oil cup with chemically pure petroleum ether and benzene.
(3) Wash the oil cup again with acetone, and then rinse it with neutral detergent.
Use 5 % sodium phosphate distilled water solution to boil for 5 minutes, and then wash with distilled
water several times.
Wash all parts several times with distilled water.
(6) Dry the parts in an oven with a temperature of 105 to 110 °C for 60 to 90 minutes.
(7) After the parts are washed, they are assembled when the temperature drops to room temperature.
Method 3: Ultrasonic cleaning method
(1) Open the oil cup.
(2) Wash all parts with solvent.
(3) Using soapy water to oscillate all parts for 20 minutes in an ultrasonic cleaner; Remove parts, with
tap water and distilled water cleaning; We're oscillating with distilled water for 20 minutes.
Method 4: Solvent cleaning method
(1) Open the oil cup.
(2) Rinse all parts with a solvent and replace the secondary solvent.
(3) Wash all parts with acetone first and then with tap water. Then wash with distilled water.
(4) Dry the parts in an oven with a temperature of 105 to 110 °C for 60 to 90 minutes.
When testing a group of similar liquid samples but not used, we can use the same test cell which doesn't
need intermediate washing, as long as the last test sample has better performance than the specified
value of the measuring,. If the performance of the tested sample is inferior to the measuring sample, the

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test cell must be cleaned before you make the next test.