Huazheng HZZGF-Z Series User manual

HZZGF-Z Series
Intelligent DC High Voltage
Generator
Huazheng Electric Manufacturing (Baoding) Co., Ltd

DC High Volta ge Gen erator
Ope ration Pre ca ut io ns ！
I.Before boosting: adju st the boost knob to "0 ", and then carry out the
boosting experi me nt .
II.At the end: the vol tage should be re duced to 0 first,, do not tur n off the
power, discharge the test object with a discharge rod, after the discharge
is com pl eted, tur n off the pow er to end th e experim en t.
III.Note: When dischar gi ng, the discharge rod cannot disch ar ge the
(microampere case), which will bur n the microampere. The test obj ec t
sho uld be disc ha rged dire ctly!
IV.W he n doing capacitive test (such as cable test), a current lim it ing
resistor must be insta ll ed at the output end of the press ure doubler.
V.When per forming th e bo osti ng experiment without the test ed product, the
outp ut screw at the to p of the doubler should be ti gh tened with an
in sulati ng ca p, and th e microammeter or hi gh -v oltage line can not be used
fo r the boosting experiment witho ut the tested product.

Contents
I.Scope of application.................................................................................................................. 1
II.Technical features..................................................................................................................... 1
III.Technical specifications and working methods..............................................................2
IV.Instructions for use..................................................................................................................2
V.Test wiring method......................................................................................................................10
VI.The use of discharge rod......................................................................................................... 12

1
I.Scope of application
HZZGF-Z series intelligent DC high-voltage generators are mainly used for
DC withstand voltage tests on high-voltage electrical equipment such as zinc
oxide arresters, power cables, transformers, circuit breakers, generators, etc. or
DC leakage current test.
Using AIPWM technology, the inaccurate linearity of PWM technology has
been adjusted, so that the accuracy of the instrument has been greatly improved.
And use AI technology to set overvoltage protection and overcurrent protection to
replace the problem that the digital dial switch can only set the voltage value, but
cannot set the current value and voltage drift, and add AI automatic zinc oxide
arrester measurement, cable segmentation Withstand voltage test, automatic
withstand voltage test function, and can directly print the test report and save the
test report, retain the manual mode, add the function of printing under any voltage
and current, and the function of segment timing. The instrument has added
perpetual calendar and time functions, and the experimental report has time and
date.
II.Technical features
Fully automatic MOA test, complete display of the process of pressure rise
and fall, pressure holding time.
Automatic cable segment withstand voltage test, complete display of the
boosting process and pressure holding time.
Automatic withstand voltage test, complete display of the process of lifting
and lowering, and the holding time.
Adopt AIPWM technology to adjust the inaccurate linearity of PWM, and the
precision has been greatly improved. Ripple coefficient≤0.2%.
With segment timing, and printing function under arbitrary voltage and
current.
The instrument has added perpetual calendar and time functions, and the
experimental report has time and date.

2
III.Technical specifications and working methods
1.Voltage output 0-120kV, accuracy ±1% ±1 word
2.Current output 0-2000uA, accuracy ±1% ±1 word
3.With automatic zinc oxide arrester test, cable segment withstand voltage,
automatic withstand voltage function
4.It has the function of manually adjusting the voltage output.
5.Working method: intermittent use: rated load 30 minutes, 1.1 times rated
voltage use: 10 minutes
6.Working environment: Temperature: -10℃～ +40℃
7.Relative humidity: no more than 85% when the room temperature is 25°C (no
condensation)
8.Altitude: below 1500 meters
IV.Instructions for use
（1）Panel Description
1.IF output
2.Optical fiber
3.Measurement grounding
4.Power
5.RS-232
6.Voltage regulation
7.Button
8.LCD Screen
9.Printer
10.Microammeter interface
11.Pressure multiplier
grounding interface
12.IF input of pressure
doubler

3
（2）Operation Instructions
Turn on the power switch, the screen displays the boot screen as shown in below:
·Startup screen
Then the function selection interface appears
Press the "Function" key in this interface to move the cursor to each test item. Then press
the "Start and Stop" button to enter the corresponding test item.
Enter "Query", you can view the stored test record data, a total of 255 records can be
stored
Enter the "Settings" date and time adjustment, you can adjust the date and time.
DC high voltage generator test：
1.Manual Test
In the function selection interface, select the manual test and press the start and stop key
to enter the manual test setting interface.
Intelligent DCHV Generator Welcome
Welcome
Manual Test
Auto Test
MOA Test
Cable Test
Setup Query

4
At this time, press the function key to move the cursor to the corresponding parameter to
modify the value through "+" or "-" or "Start and Stop". After modifying the parameters,
move the cursor to "Start" and press "Start and Stop" to enter the test.
At this point, gently twist the voltage regulator knob to make the voltage rise slowly, and
observe the current size.。
When the boost is completed, press the "Start and Stop" button to turn off the high voltage
output, and the automatic discharge screen will be displayed.
Then enter the results interface
Manual
1sec
Prot U 010kV
Prot I 05500μA
Start Return
Testing Microammeter 0μA
Voltage 3.5V
Current 4μA
Time 4S

5
At this time, press the select key to "Save" to store the test results.
At this time, press the select key to "Print" to print the test results.
At this time, press the select key to "Exit" the instrument returns to the function selection
interface
2.Zinc oxide arrester test：
In the function selection interface, move the cursor to MOA TEST, press the "Start and
Stop" key,
Display the parameter setting interface of zinc oxide arrester.
At this time, press the "Function" key to move the cursor to the corresponding parameter
and modify the value with the "+" key or "-" key. After modifying the parameters, move the
cursor to the start test, and press the "Start and Stop" key to enter the test.
Manu
al
Voltage
Current
Time
Prot U
Prot I
Start Return

6
When the current rises to 1000uA, the instrument stops boosting, at this time the 1mA
current starts timing, and the default timing is 5 seconds. Or according to the set time to
complete. After the timing is over, the instrument starts to reduce the voltage. When the
voltage drops to 0.751mA, wait for 5 seconds.
Then quickly turn off the high pressure. Automatic discharge.
If the discharge voltage is very slow, it is recommended to use a discharge rod to
discharge manually. When the discharge is completed, the instrument displays the result
interface
At this time, press the select key to "Save" to store the test results.
At this time, press the select key to "Print" to print the test results.
At this time, press the select key to "Exit" the instrument returns to the function selection
interface
Boosting...
Print Save Exit

7
3.Cable segment withstand voltage test：
In the function selection interface, select Cable Test, press Start and Stop, and the Cable
Test setting page is displayed.
Select "Setup" to display detailed parameter settings.
At this time, press the function key to move the cursor to the corresponding parameter and
modify the value through the increase or decrease key or the start and stop keys. Set the
voltage and withstand voltage time, after modifying the parameters, click the "Start and
Stop " to exit to the parameter setting interface, move the cursor to the "start" test, and
press the “start and stop” button to enter the test.
Cable
1 sec
Setup
Speed 3.0
Start Return
Cable Test Parameter
S
S
S
S
S
S

8
When the voltage rises to the first stage voltage, start timing, when the timing ends, start
the second stage boost
The instrument will turn off the high pressure when the 6th stage of the boost timer is
completed. Automatic discharge.
If the discharge voltage is very slow, it is recommended to use a discharge rod to
discharge manually.
When the discharge is completed, the instrument displays the cable segment withstand
voltage test result interface. Press the up and down keys to turn pages
At this time, press the select key to "Save" to store the test results.
At this time, press the select key to "Print" to print the test results.
At this time, press the select key to "Exit" the instrument returns to the function selection
interface.
4.Auto Test
In the function selection interface, select the Auto Test, and press the Start and Stop keys
to enter the automatic boost test parameter setting interface.
1sec Boosting
Voltage
Current
Time

9
At this time, press the function key to move the cursor to the corresponding parameter and
modify the value through“+” or“-”and “Start and Stop” buttons. After modifying the
parameters, select Start, and press the "Start and Stop" key to enter the test.
When the voltage rises to the set voltage, the timer starts, and the instrument will turn off
the high voltage after the timer is over. Automatic discharge. The automatic discharge
screen is displayed. If the discharge voltage is very slow, it is recommended to use a
discharge rod to discharge manually.
When the discharge is completed, the instrument displays the automatic withstand voltage
test result interface.
Auto
1sec
Test V
Prot I
Boosting Speed
Holding Time
Start Return
Testing...
Voltage
Current
Time

10
At this time, press the select key to "Save" to store the test results.
At this time, press the select key to "Print" to print the test results.
At this time, press the select key to "Exit" the instrument returns to the function selection
interface.
V.Test wiring method
（1）Test cable
When testing the cable, it is strictly forbidden to connect the microammeter for testing.
Auto
Voltage
Current
Time
Print Save Exit

11
(2)Transformer
（3）MOA

12
(4)Test generator
VI.The use of discharge rod
1. The special discharge rod should not be in direct contact with high-voltage DC
discharge, and should be kept at a distance. When the tip of the discharge rod initially
produces corona discharge, and the voltage on the test object gradually drops by 20% of
the test voltage, then touch the discharge rod to the shell of the microammeter. discharge.
Finally, hang the ground wire of the grounding end of the discharge rod directly on the test
object.
2. Special attention is not allowed to directly discharge the ground wire on the shell of the
high-voltage microammeter, so as to avoid the damage of the high-voltage microammeter
caused by the strong impulse discharge current.