Huazheng HZYDP-30KV User manual

HZYDP-30KV
Ultra-low Frequency High-voltage
Generator
Huazheng Electric Manufacturing (Baoding) Co., Ltd

Dear use r:
Thank you for ch oo sin g HZYDP-30KV Ul tra-low Frequency High-voltag e
Gen erator.
We hope that this instrument can make your work easier and more
enjoyable, so that you can get th e feeling of offic e automation in the test
and ana ly si s work.
Before usin g the instru ment, ple as e read this manual, and oper ate and
maintain the instru ment accord in g to the manual to prolong its service life.
"Just a light press, the test will be com pleted automatically" is the
operating chara ct eristi cs of this instru me nt .
If you are sa tisfied with thi s instrume nt, please tel l your co lleagues;
if you are not sa tisfied wi th this in st rument, please ca ll [phone] to
tell yo u to serve you at all tim es -Baodi ng Hu az he ng Electric Manufac turi ng
Co. , Ltd., ou r co mpany will def in itely make you satisfied !

Foreword
I. Thank you for selecting the product 0 of our company! You can obtain comprehensive
technical support and services from our company.
II. This product manual is applicable to the FS-VLF-30/1.1 0.1Hz ultra-low frequency
high-voltage generator.
III. Before using this product, please read the product manual carefully and keep it
properly for future reference.
IV. This product is a high-voltage electrical equipment testing instrument. Please follow
the steps required by the product manual when using it, and strictly abide by the
relevant national regulations. If it is used improperly, it may damage equipment and
endanger personal safety!
V. In the process of reading this product manual or using the instrument, if you have any
doubts, please consult our company.

Contents
I. Overview .........................................................................................................................1
II. Advantages of 0.1 Hz Ultra-low Frequency Withstand Voltage Technology ................1
III. Product Features ..........................................................................................................2
IV. Technical Parameters of VLFS Series Products ......................................................... 3
V. Instrument Structure and Function Description ............................................................5
VI. Operating Instructions ................................................................................................. 6
VII. Withstand Voltage Test Methods of Power Cables ..................................................17
VIII. Withstand Voltage Test Methods of Synchronous Motor ........................................19
IX. Notes ..........................................................................................................................21
X. Enclosed Accessories .................................................................................................21
XI. Transportation and Storage .......................................................................................22
XII. Quality Assurance .....................................................................................................23

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I. Overview
The high-voltage withstand test of electrical equipment is one of the most important items
specified in the Preventive Test of Insulation. The withstand voltage test can be classified
into the AC withstand voltage test and the DC withstand voltage test. The AC withstand
voltage test can also be divided into power frequency, frequency conversion and 0.1Hz
ultra-low frequency test technologies. The 0.1Hz ultra-low frequency technology is the
latest technology and is the technology recommended by IEC (International
Electrotechnical Commission) at present. The new generation of VLFS series
microcomputer type 0.1 Hz ultra-low frequency high-voltage generators are core products
independently developed by FARSEE,they overcome many shortcomings of mechanical
domestic products, and its cost performance is much higher than the similar imported
products. It is particularly suitable for the withstand voltage test of electrical equipment
(e.g.: power cables, power capacitors, large- and medium-sized generators and motors,
etc.) with large insulation equivalent capacitance, and it meets the requirements of the
electric power industry standard General Technical Specification of Ultra-low Frequency
High-voltage Generator DL/T849.4-2004 newly issued by the country in 2004.
II. Advantages Of 0.1 Hz Ultra-low Frequency
Withstand Voltage Technology
The ultra-low frequency insulation withstand voltage test is actually an alternative method
of the power frequency withstand voltage test. When conducting power frequency
withstand voltage tests on test products such as large- and medium-sized generators,
motors, power cables, etc., as their insulating layers exhibit relatively large capacitance,
test transformers or resonance transformers with very large capacity are required. Such
huge equipment is not only cumbersome and expensive, but also very inconvenient to use.
In order to solve this conflict, the method of reducing the test frequency thereby reducing
the test power capacity is generally adopted in the world. Many years of theory and
practice at home and abroad have proved that replacing the power frequency withstand
voltage test with a 0.1 Hz ultra-low frequency withstand voltage test can not only have the
same equivalence, but also the size of equipment is greatly reduced, the weight is greatly
reduced, the capacity is about 1/500 of the power frequency theoretically, and it is simple
to operate. This is the main reason why developed countries generally adopt this method.
According to the actual situation of the power system in our country, the National
Development and Reform Commission has formulated the industry standard Ultra-low
Frequency (0.1 Hz) Withstand Voltage Test Method for XLPE Insulated Power Cable of

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35kV and Below. In 2004, the power industry standard General Technical Specification of
Ultra-low Frequency High-voltage Generator DL/T 849.4-2004 was issued, and this latest
test method is promoted in our country at present.
Although the DC withstand voltage test equipment has the advantages of small size, light
weight, low cost, etc., the DC withstand voltage test is also the most destructive to
insulation of the tested product. Therefore, the latest national regulations on preventive
test of electrical equipment have expressly stipulated that DC high voltage is no longer
used for conducting withstand voltage tests on electrical equipment, and the AC withstand
voltage tests are recommended.
The new generation of VFLS series 0.1 Hz ultra-low frequency high-voltage generator
researched and developed by FARSEE adopts the latest power electronic components
and the latest microcomputer technology, which further reduces the size and weight of
equipment, and with the fully automatic operation, it is more stable in performance, which
overcomes the shortcomings of short service life, high fault rate and large size for the first
generation of boosters. Through years of practice, a large number of user feedbacks
show that: The 0.1 Hz ultra-low frequency high-voltage technology of FARSEE Company
is in the lead in the country, and it is the most cost-effective!
Attached table: Comparison on Performance of Various Withstand Voltage Test
Equipment
Comparison
Content
Power
Frequency
Withstand
Voltage
Frequency
Conversion
Withstand
Voltage
0.1 Hz
Withstand
Voltage
DC Withstand
Voltage
Equivalence
Good
Good
Good
Poor
Insulation
destructiveness
Low
Low
Low
High
Operation safety
Relatively low
Relatively low
High
Relatively low
Test wiring
Complicated
Most complicated
Simplest
Complicated
Equipment size
Maximum
Relatively large
Small
Minimum
III. Product Features
☆Advanced technology: By adopting digital frequency conversion technology and
microcomputer control, the test procedures of boosting, voltage reduction, measurement,
protection, etc. are fully automated. The instrument has the electronic calendar function,

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and the time can still be maintained after powering down.
☆Convenient operation: Simple wiring, and fully automatic operation.
☆Comprehensive protection: Multi-protection (over-voltage protection, over-current
protection on high- and low-voltage side), rapid action (action time ≤ 20 ms), the
instrument is safe and reliable.
☆Safe and reliable: The controller and the high-voltage generator are in low-voltage
connection and under photoelectric control, which are safe and reliable to use.
☆By adopting high- and low-voltage closed-loop negative feedback control circuit, the
output has no capacitive rise effect.
☆Complete configuration: 8-inch industrial touch screen, manual storage, and manual
printing.
☆The instrument has the data communication function. It can be connected to a
computer through a USB port for uploading test data to the computer.
The instrument has the help documentation function, through which the directions for use,
wiring and notes of the instrument can be known without viewing the instruction book.
The instrument has the system setting function, through which the current time can be
modified.
Large test range: Multi-frequency selection of 0.1Hz, 0.05Hz and 0.02Hz, a large test
range.
Small size and light weight: Very conducive to outdoor operations.
IV. Technical Parameters Of VLFS Series Products
1. Technical parameters
ain parameters of series products are shown in Table 1
Model★M
Peak
Voltage
Measuring Range
Weight
Purpose
HZYDP-30KV
30kV
≤1.1μF @ 0.1Hz
Controller: 4kg
Booster: 25kg
Cables,
generators with
voltage of 10kV
and below
≤2.2μF @ 0.05Hz
≤5.5μF @ 0.02Hz
HZYDP-50KV
50kV
≤1.5μF @ 0.1Hz
Controller: 5kg
Booster: 35kg
Cables,
generators with
voltage of 20kV
and below
≤3.0μF @ 0.05Hz
≤7.5μF @ 0.02Hz
HZYDP-80KV
80kV
≤1.1μF @ 0.1Hz
Controller: 5kg
Cables,

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Table 1 Main Technical Parameters of VLFS Series Ultra-low Frequency High-voltage
Generator
★Power supply: 220V±10%, 50±5%Hz
Note: When a portable generator is used for supplying power, it is required
that output voltage and frequency of the generator shall be stable (generally it
is required that power shall be greater than 3 kW, the frequency shall be 50
Hz, and voltage shall be 220V±5%), otherwise some assistance measures
shall be used to stabilize output of the generator.
★Output voltage precision:
Degree of instability for peak value of output high voltage: ≤1%
Degree of instability for frequency of output voltage: ≤3%
Distortion rate of output voltage waveform: ＜5%
★The instrument has the function of not burning the booster and the mainframe
in case of power failure and sudden shutdown during the operation.
★Service environment: Temperature: －100C～＋400C, humidity: ≤85%RH
★Description of testing range:
1. The capacitance of the tested product shall not exceed the maximum rated
capacitance of the instrument, and the value is as shown in Table 1;
2. If the capacitance of the tested product is too low, the waveform would be affected.
If it is lower than 0.05µF, the instrument would not output normally, so that the
auxiliary device (optional) provided by the company can be adopted.
3. For capacitance estimation of common electrical equipment, see Table 2 and Table
Table 2 Single-phase to Ground Capacitance of Different Types of Generators
Turbo-generator
Hydro Generator
Generator capacity
(MW)
200
300
600
85
125-150
300
400
Single phase to
ground capacitance
(µF)
0.198
0.18-0.26
0.31-0.34
0.69
1.8-1.9
1.7-2.5
2.0-2.5
Table 3 Capacitance (µF/km) of XLPE Insulated Single-core Power Cable
Booster: 45kg
generators with
voltage of 35kV
and below
≤2.2μF @ 0.05Hz
≤5.5μF @ 0.02Hz

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V. Instrument Structure And Function Description
This instrument consists of two parts: i.e. the controller and the booster. The structures
and functions of the two parts are as follows:
1. Schematic diagram of controller panel
The layout for the components of the controller panel is as shown in Figure 1. The
functions of each component are as follows:
Figure 1 Schematic Diagram of Controller Panel
“Ground” - Grounding terminal: Connect to the earth when in use.
“Output” – Output multi-pin socket: Connect to the input multi-pin socket of the booster
when it is in use.
"Switch" - Power switch: With a built-in indicator light, it is illuminated when it is ON, and it
is put out when it is OFF.
"AC220V" - Power input socket, with a built-in fuse.
"Printer" - Print the test report.
“8-inch industrial control touch screen” –Menu operation, data setting and output
waveform.

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2. Schematic diagram of booster structure
Figure 2 Schematic Diagram of Booster Structure
3. Schematic diagram of display screen
Figure 3 Schematic Diagram of Display Screen
VI. Operating Instructions
1. Wiring method
Wiring instructions: Use two private wires and the grounding wire enclosed with the
product to connect as shown . Use the power cord to connect the power socket to
alternating current of 220V/50Hz.
2. Operating procedures
(1) Turn on, turn off and reset
After connecting all the lines according to the above method, you can turn on the power
switch. After the microcomputer is powered on and reset, the instrument automatically
Control input
High voltage output
floor

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enters the interface as shown in Figure 5. Turn off the power when the instrument is wired,
disconnected or temporarily not in use. The power socket shall be installed with a fuse. If
there is no display on the boot screen, check whether the fuse is blown first, and the fuse
shall be replaced according to the data provided in Table 1.
(2) Limit parameter setting
Figure 4 Main Operation Interface
Click the “System testing” menu on the main interface as shown in Figure 4 to enter the
parameter setting interface as shown in Figure 5.

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Figure 5 Parameter Selection Interface
Click the frequency checkbox below frequency selection to select the output frequency.
★There are three options of: 0.1, 0.05 and 0.02 for frequency, which is measured in
Hz.
★Modification range of test time: 0-60 minutes. It specifies the length of the test time
in minutes.
★Set voltage: It ranges from 0 to the rated value, and it is measured in kV. It sets the
test voltage to be boosted. When the instrument rises to this set voltage limit value,
it will no longer boost, and it will maintain at this peak value to carry out
constant-amplitude sine wave output.
★The setting range of over-current protection value is from 0 to the rated value, and it
is measured in mA. It specifies the upper limit of current for the tested product.
When current exceeds this setting, the instrument automatically cuts off the output.
★The setting range of over-voltage protection value is from 0 to the rated value, and it
is measured in kV. It specifies the upper limit of voltage for the tested product.
When voltage exceeds this setting, the instrument automatically cuts off the output.
(Note: The above voltage, current and measured data displayed by the
instrument are all peak values.)
(3) Testing interface
Click the “OK” button, and the instrument enters the booster standby interface as shown in
Figure 7.
Figure 6

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Click the “Start” button: Enter the automatic testing interface (as shown in Figure 8).
Figure 7
(4) Auto boost
After clicking the “Start” button as shown in Figure 6, the instrument will carry out the
voltage stepping up test according to the following process under control of the
computer:
Self-inspection → Boosting → Constant-amplitude output → Shutdown
After passing the self-inspection, the instrument enters the boosting status
automatically, as shown in Figure 7, and the instrument will take a plurality cycles to
boost voltage to the set value. During the boosting process, if you want to pause, you
can click the “Stop/discharge” button as shown in Figure 8, and the instrument will shut
down. After voltage is boosted to the set value, the instrument starts timing
automatically. Click the “Stop/discharge” button, the instrument will stop outputting
high voltage, and it will discharge automatically for the tested product.
(5) Fine tuning of voltage
Voltage carries out fine increasing or fine decreasing automatically. When the voltage
value exceeds the set one, the instrument will carry out fine decreasing automatically
under control of the CPU so as to reach the set voltage value. When the voltage value
is lower than the set one, the instrument will carry out fine increasing automatically
under control of the CPU.
(6) Shutdown
The instrument provides two shutdown modes:
★Timing shutdown: When the timing reaches the set time, the instrument will

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automatically shut down.
★Manual shutdown: Click the "Stop/ discharge” button to shut down.
These two shutdown modes are normal shutdowns. The prompt interface as shown in
Figure 9 will appear after shutdown.
Generally, when current has no abnormality and the tested product has no discharge
phenomenon or over-current protection, it can be considered that it passes the test.
Figure 8 Interface of Passing the Test
★In addition, there are also two types of non-normal shutdowns: over-voltage protection
shutdown, and over-current protection shutdown.
After click the “Stop/discharge” button, the instrument will stop outputting automatically to
discharge automatically. When the loaded voltage value is as low as 0.6KV, the
mainframe returns to the page as shown in Figure 8, and click the “Save” button to save
the test data. Click the “Print report” button to print the tested data. Click the “Return”
button to skip to the interface as shown in Figure 9.

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Figure 9
(7) View historical data
Figure 10
Click the "Data View" button in the main menu to enter the Figure 11 interface to view the
stored data.

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Figure 11
Figure 12
It can save 50 groups of data. In the data, the testing time (year, month, date, hour, minute
and second), the test voltage value, the test current value, and the test duration are
recorded.
(8) Help documentation
Click the “Help documentation” button on the main page, the system enters the page as

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shown in Figure 13 to view help information.
Figure 13
Click each navigation button on the page to respectively enter different help interfaces, as
shown in the figures.

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(9) Version information
Click “Version information” on the main page, the system skips to the page as shown in
the figure, and the system version information is displayed.
(10) Click the “Data communication” button, the system click to the page as shown in the
figure. Communication can be carried out through the USB socket on the panel and the
computer to upload data in “Data view” to the computer.

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(11) System setting
Click the “System setting” button in the main menu, the system skips to the page as
shown in the figure to modify the current time.