Huazheng HZ-ZKD User manual

HZ-ZKD
Vacuum switch vacuum tester
User Manual
Huazheng Electric Manufacturing (Baoding) Co., Ltd

Dear use r:
Thank you for choosing HZ -ZKD Vac uum switch vac uu m tester.
We hope th at this ins trum ent can mak e your work easier and mo re
enjoyable, so th at you can get the fe el in g of office automation in the tes t
and ana ly si s work.
Before us in g the inst ru ment , ple ase read this manual, and operate and
maintain the instru ment ac cord in g to th e manual to pr olong its service li fe .
"Just a light press, the test wil l be complete d aut omat ically" is th e
operating chara ct eristi cs of this instru me nt .
If you are satisfie d with thi s instru ment, please tell you r colleagues;
if you ar e not sa tisfied with this in st ru ment, please ca ll [phone] to
tell you to serve you at all times-Baoding Huazheng Electric Manufac turi ng
Co. , Ltd., ou r co mp an y will def initel y make yo u satisfied !

Contents
I. Overview................................................................................................ 错误！未定义书签。
II.Key Function And Feature............................................................... 错误！未定义书签。
III. Major Technical Indicators.............................................................错误！未定义书签。
IV. Operational Approach..................................................................... 错误！未定义书签。
V. Precautions.............................................................................................错误！未定义书签。
VI. Maintenance..........................................................................................错误！未定义书签。
VII. Oil Cup Cleaning Method and Common Fault Clearances......... 错误！未定义书签。
IX. Packing List........................................................................................错误！未定义书签。

1
I、Safety rules and precautions
1. Please connect all test cables before starting up, such as printer cables;
2. Before measuring, please check whether the tube type is suitable for the vacuum tube
to be tested for accurate measurement.
3. When starting up, shutting down and measuring, do not touch the high voltage line
and magnetron current line to prevent electric shock.
4. During the use of the instrument, if abnormal noise is found from the coil, the short
circuit or poor contact of the test line should be considered, or the air is very humid, or
the surface of the vacuum circuit breaker is covered with dust.
5. Please do not use gasoline, banana water and other chemical agents to wipe the
machine, but a soft and dry cloth.
6. Please confirm whether the local power grid voltage matches the power supply
voltage of the machine.
AC 220±10% 50/60HZ
7. Please be careful not to use the machine under thunderstorm conditions.
8. Please do not damage the cables that come with the machine to ensure safe use.
9. When the instrument fails, non-professional and technical personnel of the company
are strictly prohibited from opening the instrument for maintenance.
10. It is strictly forbidden to disconnect the high voltage end directly or indirectly to the
ground.
II、Instrument introduction
The vacuum tester is an appraisal device for the vacuum of the vacuum interrupter. It
uses a single-chip computer as the main control unit, and the testing process is fully
automated. In principle, this instrument has changed the method of calibration for similar
products at home and abroad by current peak value, and uses ion charge for calibration.
In this way, the accuracy of the physical principle is higher, and the interference of the
pulse power

2
supply during the test is effectively suppressed, and the test is stable and reliable. The
instrument uses the secondary sampling method to deduct the leakage current due to
environmental factors, and considers the determination of the completely leaking
vacuum interrupter during the measurement process, and truly achieves the correctness
of the vacuum interrupter installed on the whole machine. Accurate measurement. At
present, there are 35 measurement standard curves of vacuum interrupter in this
instrument, covering most tube types at home and abroad. The instrument has excellent
quality, reliable performance, beautiful appearance and convenient use.
Performance characteristics：
1. Sampling technology based on ionizing charge
All vacuum testers use sampling technology based on ionized charges. Our company’s
experts discovered in the study of magnetron discharge: when the external excitation
power supply, the geometric size of the vacuum interrupter, and the materials used are
certain, the vacuum degree in the vacuum interrupter has a very accurate
correspondence with the amount of ionized charge. The peak value of ionization current
is only indirectly related to probability. Therefore, our company pioneered the sampling
technology based on ionization charge, which significantly improved the accuracy of
vacuum measurement in the vacuum interrupter.
2. High and low pressure tube type test
This machine additionally applies two gears (high voltage 30,000 and low voltage 2.5) to
the test voltage output, so it can effectively test various types of tubes with different high
and low voltages.
3. Built-in measurement curves of almost all vacuum interrupters at home and abroad
Due to the different geometrical dimensions and materials of the vacuum interrupter,
when the internal vacuum degree and the external excitation power supply are constant,
the amount of discharge charge is different, and there are considerable differences. For
accurate measurement, there must be a corresponding deduction curve from ionization
charge to vacuum degree for each vacuum interrupter. Through close cooperation with
major domestic vacuum interrupter manufacturers, our company’s experts have obtained

3
data on the relationship between ionization charge and vacuum degree of almost all
vacuum interrupters at home and abroad, and send their characteristic parameters to
this series through mathematical processing. product. Therefore, this series of products
have built-in measurement curves of almost all vacuum interrupters at home and abroad,
which is unique among similar products at home and abroad.
4. Treatment of leakage current
When a negative ion current is applied to the moving contact of the vacuum interrupter in
the breaking state, the static contact end will have a leakage current of several
microamps, even if it is the same type of vacuum. The interrupter also has large
individual differences. Especially for the vacuum interrupter installed on the complete
machine, because of the leakage of the surrounding insulating supports, the sum of
these leakages has greater instability and unpredictability. And the value is equivalent to
the ionization current of the vacuum interrupter of the order of 10E-4Pa. We adopt the
method of secondary starting high voltage, deducting the leakage current, and guarantee
the vacuum measurement accuracy of the vacuum interrupter whether installed on the
whole machine or to be installed.
5. Identify the completely leaking vacuum interrupter
In this machine, it is judged whether the vacuum interrupter is completely leaking by
means of high pressure breakdown.
6. Complete input protection circuit
When the vacuum degree of the vacuum interrupter is very low, the vacuum interrupter
will be broken down by high voltage during the measurement, and the instant high
voltage is directly applied to the negative ion current sampling circuit, making it bear a
very strong electrical shock. The sampling circuit adds a complete protection circuit.
Even if the instrument is the first time because the high voltage at the input terminal is
directly applied to the negative ion current sampling terminal, the microcomputer
protection device will immediately start to control and enter the protection state without
causing serious damage to the circuit.
7. Data recording
Built-in micro-printer can print out the measured data at any time.

4
III、Test principle
Using the different leakage currents of the ion current under different vacuum conditions
to test and identify the advantages and disadvantages of the vacuum isolation chamber.
The two contacts of the arc extinguishing chamber are separated by a certain distance,
and the moving contact applies a high voltage pulse to the static contact to apply a
negative ion current. Because the leakage current is very weak, it is susceptible to
different interference from the outside world to reduce accuracy. Therefore, the
excitation coil must be wound outside the arc extinguishing chamber, and a large current
is passed to the coil to generate a pulsed magnetic field synchronized with the high
voltage in the arc extinguishing chamber to accelerate the ion current and enlarge the
sampling rate proportionally. In this way, under the action of the pulsed magnetic field,
the electrons in the arc extinguishing chamber move in a spiral motion and collide with
residual gas molecules to ionize. The ion current generated is approximately
proportional to the residual gas density, that is, the degree of vacuum. For vacuum tubes
with different diameters, under the same vacuum conditions, the magnitude of the ion
current is also different. Through experiments, the corresponding relationship curves of
vacuum degree and ion current of various tube types can be calibrated. When the ion
current is measured, the corresponding internal proportional parameters are called and
accurately calculated to obtain an accurate and true vacuum value. That is to say, the
vacuum degree of the tube is obtained by querying the ion current-vacuum curve of the
tube, and this process is automatically completed by the computer.
IV、The main technical parameters
1. Measured vacuum bubble: voltage level above 6KV-35KV
2. Measuring range: 10-5-10-1Pa
3. Measurement error: ±10% in 10-4-10-1Pa
4. Measurement resolution: 10-5 Pa
5. The leaking arc extinguishing chamber will undergo electrical breakdown during the
measurement, and the machine is in a protected state.
6. Allowable ambient temperature: -20℃-50℃, if the test is below 0℃, please power on

5
the machine for 20 minutes before using it.
7. Air humidity: <85%RH
8. Input power: AC220V±10% 50/60HZ
9. Dimensions: 350mm×320mm×225mm
V、Vacuum tester panel and external wiring diagram
Panel introduction:
1. Ion current output terminal: used to output the ion current required for testing.
(Leakage current sampling terminal)
2. Magnetron current output terminal: used to output the magnetron current required for
the test to accelerate the electron flow to reduce the influence of various external factors
on the measurement accuracy.
3. High voltage output terminal: used to output the high voltage required for testing. (Low
voltage 25,000 volts, high voltage 30,000 volts) For details, see 3.3.5 operating
instructions.
4. External power supply: Provide the working voltage required by the instrument.
AC220V±10% 50/60HZ
5. Power switch: the main switch to control the instrument.
6. Tube type: used to select the tube type corresponding to the test.

6
7. Vacuum degree display: used to display the true value of the detected vacuum degree.
(The reading is taken by scientific notation)
8. Pa (vacuum) light: used to indicate the current reading type and unit
9. A (current) light: used to indicate the current reading type and unit. For details, see
3.3.4 Operating Instructions.
10. High-voltage selector switch: used to select the high-voltage level required for
measurement. The tube type to be tested is the high-end selected above 10KV. Choose
low gear below 10KV.
11. Magnetron voltage: used to indicate the voltage of the magnetron coil.
12. Key: the selection key is used to select the tube type, and the light of the selection
key is on to be effective; after the tube type is selected, the light of the selection key is
off to be selected.
Up and down keys: used to scroll up and down to select the desired tube type.
Print key: After the measurement is over, print out the measured data. The print button
light is on and effective.
Check key: If there is no alternative parameter, you can use the check key. This can
directly produce ionization current. Generally speaking, the ionization current (A) is
about two orders of magnitude smaller than the vacuum degree (Pa).
Measurement key: After the tube type is selected, the measurement key light is on to
indicate the start of measurement.
Reset button: used to reset the whole machine after measurement. Press【Reset key】,
the instrument returns to the initial state. If selected during measurement
If the selection is wrong, you can press [Reset Key] at any time to re-select.
13. Printer: used to print test data. The S/L key is the paper feed and eject key; the POW
is the power indicator. After the printing paper is used up, press the buckles on both
sides of the upper cover, open the upper cover, take out the paper roll, and load new
paper.
14. Connect to the earth: used to connect with the earth to reduce the influence of static
electricity.

7
VI、Instructions
1.Wiring instructions
Keep the two contacts of the isolation room in a separate state, then wind the
magnetron coil, and then insert the two plugs of the magnetron coil into the two red and
black plugs of the magnetron current output. In addition, the high-voltage wire and the
ion wire are respectively connected to the two contacts of the vacuum bubble (moving
and contacts are not separated).
2.Button description
All the keys on the panel, if the small indicator light on them is on, it means the
keys are valid, otherwise, they are invalid. If the key is valid, press the key again, the
indicator light is off, and the key is in an invalid state.
3.Test procedure method
(1) Boot
After checking that the wiring is correct, it can be turned on. Press the power switch key
on the panel of the instrument to the “on” position, and the word “P” appears in the first
digit of the digital display. After verification (step 3.2) is normal, the instrument is
operating normally, and it can be started after 5 minutes of warm-up. measuring.
(2) Instrument inspection
Perform this function to calibrate the instrument and self-check function. Press [Select
key], [Check key], [Measuring key] in sequence to make it valid. Use the up and down
keys to adjust the inspection parameters (tube type display)
①Select parameter 1～3 to check the sampling amplifier：
When adjusted to 1, the displayed value is between 0.000---9.000×10-6；
When adjusted to 2, the displayed value is between 0.000---9.000×10-5；
When it is adjusted to 3, the displayed value is between 0.000---9.000×10-4；
②Select parameter 4, charge control check:
When it is adjusted to 4, the charging circuit is turned on, and finally the capacitor
voltage is controlled at 350V.
③Select parameter 5 and check the display:
At this time, the display lights up one by one, and the six digits are consistent, not many

8
strokes and fewer strokes. After checking, press 【Reset key】.
Select parameter 6, start high voltage:
At this time, the high voltage indicator light is on, high voltage is generated, and the last
four digits of the display show the high voltage value in ten thousand volts. When doing
this inspection, pay attention to the location of the high-voltage line to avoid danger.
④Select parameter 7, internal data storage check:
The computer in the instrument performs a strict inspection on the internal data memory,
and the display shows the address of the unit being inspected. If an error occurs, the
computer stops the inspection, and the value of the display is the error address. The unit
number is 8000H-9FFFH. When it is close to 9FFFH, press the up and down keys to exit
the check when the check is over, otherwise, repeat the check.
（3）Tube type selection
①When measuring, first confirm the vacuum bubble tube type. Refer to Appendix 1 or
Appendix 2 in the manual. Enter the curve number corresponding to the vacuum bubble
tube type into the tube type of the instrument display window.
②If the tube type to be measured is not indicated in the manual, the diameter (outer
diameter) of the vacuum bubble can be measured on site and the corresponding curve
number can be found. It should be noted that the dimensions are as close as possible
when measuring, and the wiring method is the same.
③Enable [Select key], and then use ↑ key ↓ key to adjust the tube type parameters and
call up the required curve number (see Chapter 2 Instrument Introduction/Performance
Features/Section 3 for details)
④If there are no alternative parameters, the [calibration key] can be enabled, so that the
ionization current can be directly given. Generally speaking, the ionization current (A) is
about two orders of magnitude smaller than the vacuum (Pa).
⑤The tube type under test is to select the high position of the selector switch above
10KV, and the low position of the selector switch below 10KV.（4）Test
①After the tube type is determined, press the [select key] to exit the selection, and press
the [measurement key]. The instrument then automatically completes all measurement,
calculation, display and other whole processes. If the print key is pressed at this time,

9
the measurement result will be printed.
②The measurement steps performed by the computer in the instrument are as follows:
Start the high voltage → measure the leakage current → turn off the high voltage → turn
on the charging switch → the voltage reaches the specified value → start the magnetron
current, measure the leakage current + ionization current, → deduct the leakage current
→ convert the current into a vacuum value → display. If the [calibration key] is valid, the
current value will be displayed.
4.About test results
(1) After the test shows that the current value is zero, you should check whether the
surface of the arc extinguishing chamber is clean, because the surface is dirty, which
may cause the leakage current to change value greater than the ionization current value.
In this way, the measured value after subtracting the leakage current is less than zero
and the instrument judges If this happens, wipe the surface of the arc extinguishing
chamber and do the test again. Generally speaking, the vacuum degree obtained in this
way is higher.
(2) Based on the first measured value, the vacuum degree obtained by continuous
multiple measurements will gradually increase, which is higher than the actual vacuum
value of the interrupter. If multiple measurements must be taken, the time interval
between each measurement is about one week.
VII、Packaging list
No.
Name
Qty
1
Magnetron current
output line
1
2
Negative ion wire
1
3
Ground wire
1
4
Fixed strap
1
5
printer paper
2
6
power cable
1