Huazheng HZ-20AS User manual

HZ-20AS
Portable Lighting Arrester Tester
Huazheng Electric Manufacturing (Baoding) Co., Ltd

Dear use r:
Thank you for cho os in g HZ-2 0A SPorta bl e Light ing Arrester Tester.
We hope that this instrum ent can mak e your wo rk easier an d mo re
enjoyable, so that yo u can get th e feeli ng of office auto mati on in the test
and ana ly si s work.
Before using the in st rument, please read this manual, and operate and
maintain th e instrum en t according to the manual to prolong its service life.
"Just a lig ht press, the test will be completed automa tically" is the
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 are not satisfie d with this instrum ent, please call (03 12 ) 6775656 to
tell you to serve you at all times-Baoding Huaz he ng Electric Ma nu factur ing
Co. , Ltd., our company will def in itely make you sati sf ied !

Contents
I.Important......................................................................................................................................1
II.Overview.....................................................................................................................................2
III.Functions And Fearutres........................................................................................................ 2
IV.Technical Index.........................................................................................................................4
V.Measurement And Compensation Principle......................................................................... 5
VI.Functions Of Panel Aand Components............................................................................... 7
VII.Operating Instructions......................................................................................................... 10
VIII. Test Wiring...........................................................................................................................22
IX.After-sales Service................................................................................................................ 25
X.Packing List............................................................................................................................. 25

1
I.Important
1. If the instrument is not in use, please turn off the power in time!
2. The rechargeable battery, as consumable part, ought to be well maintained. The
effective capacity of rechargeable battery will fall gradually with time passing when the
instrument is in use, which shortens the effective time of use. In order to prolong the
service life of battery as long as possible, please pay attention to the following
maintenance measures:
2.1 When the instrument is out of service for a long period, please charge and
discharge the battery regularly at least once each month. Please use the
compatible charger provided by our company to charge the battery so as not to
damage the battery.
2.2 Insufficient-voltage use is strictly prohibited. The over discharge of the battery
power will seriously shorten its life, and even make the battery scrapped; when the
instrument prompts that power is low, you should stop using it as soon as possible
and charge the battery to avoid battery failure due to excessive discharge of
power.
2.3 Charging indicator: During charging,the indicator is red, and after charging, it is
green.
2.4 When charging, the charger should be inserted into the AC220V power supply, and
then the charging output plug will be inserted into the instrument for charging.
Otherwise, the charger may not work properly.
3. Before using, the instrument must be Reliable grounded.
4. Correct wiring according to different testing methods.
5. When using wireless test mode, the instrument host and voltage collector must use the
same wireless communication channel, otherwise, it will be impossible for wireless
communication.
6. When using the wireless test mode, voltage collector must correctly install the antenna,
otherwise, it is easy to burn the collector voltage wireless communication module; the
instrument host must also correctly install the antenna,or it will greatly shorten the

2
distance of wireless communication.
7. When using the wireless test mode, the distance between the host and the voltage
collector should be more than 1 meter. Otherwise, the wireless signal of the instrument
host can be saturated due to the over-strength of the wireless signal, thus the
instrument host will be unable to receive the radio signal sent by the voltage collector.
II.Overview
Zinc Oxide Arrester Comprehensive Tester is used to check the electrical
performances of the zinc oxide arrester (MOA).The instrument is suitable for on-site
inspection of zinc oxide arrester at all voltage levels, as well as the factory test and
acceptance test in the library when power is failed.By measuring the full current and
resistive current and other parameters,it can be found that it is possible to detect the
dangerous defects such as the internal insulation of the zinc oxide arrester and the aging
of the valve.
III.Functions And Fearutres
3.1 Being miniaturized and hand-held, small in size and light in weight, the instrument is
easy to carry and operate.
3.2 Using a high-performance and low-power ARM processor with DSP floating-point
processing units, the computing speed is faster, the operation accuracy is higher, and
the processing data is larger. Thus, the accuracy and stability of the test data can be
ensured.
3.3 High precision sampling filter circuit and digital filter technology can filter out the scene
interference signal.
3.4 The floating-point fast Fourier algorithm is adopted to realize high precision analysis of
the fundamental wave, harmonic voltage and current signal.
3.5 Using the industrial grade 5.6 inch 640 × 480 dot matrix high-brightness color LCD
screen, it displays clearly and provides friendly man-machine interface; For some

3
important operation and parameter settings, it displays the tips and help instructions;
the top of the screen status bar can display each peripheral working status and test
status information.
3.6 The electrical parameters of the three phase zinc oxide arrester can be measured at
the same time, and the interphase interference can be compensated automatically. It
can also be measured in single phase to support the PT secondary voltage of phase
B as the reference voltage. The compensation angle can be automatically calculated
when the measured phase and the reference voltage phase are different.
3.7 Provide both wired and wireless test methods, and wireless test mode operation is
more simple and flexible which can greatly reduce the work intensity of the field test
personnel.
3.8 The unique sensor board replaces the PT secondary voltage measurement
technology, making the measurement safer and faster.
3.9 Voltage collector integrated local display (128 × 64 dot matrix OLED LCD screen) and
phase sequence checking function can display three-phase full voltage, voltage
fundamental wave, three, five and seven times harmonic RMS, system frequency
values and three-phase voltage phase difference. It is easy for field testers to quickly
check the connection between the voltage collector and PT secondary voltage output
terminal and the parameters of the three-phase voltage.
3.10 The voltage collector adopts double digital isolation technology, which is more
securer and reliable.
3.11 AC and DC: built-in lithium battery power supply or 220V AC charger power
supplyself-adaptively.
3.12 With the built-in high-capacity rechargeable lithium battery inside the host and the
voltage collector, the instrument can continuously work for 8 hours after a complete
charge.
3.13 Intelligent battery management: the remaining power display, low power alarm, long
idle reminder and backlight automatic regulation.
3.14 Built-in real-time clock can display the current time and date,and automatically record

4
the test date and time.
3.15 The test data storage is divided into native storage and U Disk storage. The native
storage can store 100 test data, and those date can be transferred into the U disk. U
disk storage can save the test data and waveform pictures, with the test data in TXT
format and the waveform picture in BMP format,which can be edited and printed
directly on the computer.
3.16 The selected externalthermalprinter can print test data and the saved test record,
and the printed content can be selected so as to save the paper.
IV.Technical Index
4.1 Reference Voltage Measurement
4.1.1 Reference voltage input range: 25V～250V RMS,50Hz/60Hz
4.1.2 accuracy of reference voltage measurement: ± (reading × 5% + 0.2V)
4.1.3 accuracy of voltage harmonic measurement: ± (reading × 10%)
4.1.4 reference voltage channel input resistance: ≥1500kΩ
4.2 Current Measurement
4.2.1Whole current measurement range: 0 ～20mA RMS,50Hz/60Hz
4.2.2 Accuracy: ± (reading × 5% + 5uA)
4.2.3 fundamental wave measurement accuracy of resistive current: ± (reading × 5% +
5uA)
4.2.4 Current harmonics measurement accuracy: ± (reading × 10% + 10uA)
4.2.5 Current channel input resistance: ≤ 2Ω
4.3 Electric-field Intensity Measurement
4.3.1 input range of electric field strength: 30kV/m～300kV/m
4.3.2 accuracy of electric field intensity measurement:± (reading × 10%)
4.3.3 accuracy of electric field harmonic measurement: ± (reading × 10%)
4.4 Service Conditions And Shape

5
4.4.1 power supply：built-in lithium battery or external charger, charger input 100-240VAC
50Hz/60Hz,output DC8.4V 2A
4.4.2 Charging time: 4 hours
4.4.3 Battery life: host:8h, Voltage Collector: 8h
4.4.4 size of the host: 246mm (length) × 156mm (width) ×62mm (height)
4.4.5 weight of the host：1.0kg (excluding cables)
4.4.6 size of the voltage collector : 115mm (length) × 120mm (width) × 65mm (height)
4.4.7 voltage collector : 0.6kg (excluding cables)
4.4.8 service temperature: -10℃～50℃
4.4.9 relative humidity: ＜90%，No condensation
V.Measurement And Compensation Principle
5.1 Measuring Principle
The instrument adopts the projection method shown
in Figure 1 to calculate the resistive current of the
fundamental wave and each harmonic wave.
Figure 1:
U1 Reference voltage of fundamental wave
Ix1p Full current peak of fundamental wave
Ir1p Resistive current peak of fundamental wave
Fig.1 projection
Ic1p Capacitive current peak of fundamental wave
Φ The angle of fundamental full current advanced
fundamental reference voltage
The formula:
Ir1p = Ix1p·CosΦ
Ic1p = Ix1p·SinΦ
The full current of zinc oxide arrester contains high harmonics both generated by the

6
non-linearity of the zinc oxide arrester and by the bus voltage harmonic.Compared with Irp,
Ir1p is more stable and real, so Ir1p is suggested to be the resistance current index. Both
Φ and Ir1p can directly measure the performance of zinc oxide arrester.
5.2 Interphase Interference And Automatic Compensation
Principles
Fig.2 Interphase Interference
When the three phases test the zinc oxide arrester arranged in-line at the same
scene , as shown in Figure 2, due to the existence of stray capacitance, the current phase
of A and C offset to B phase, and the general offset angle is 2°～4° or so, which will make
phase A φ decrease, resistive current increase, phase C φ increase, and resistive current
decrease or even become negative. This phenomenon is called interphase interference.
The method to solve this problem is to adopt automatic compensation algorithm,
which is the built-in "automatic edge repair" function. Assuming that the phase difference
of Ia and Ic is 120°when there is no interference, and the interference of B to phase A and
C is the same, and then measure Φca--the angle of Ic advanced Ia, phase A
compensation Φ A = 0 (Φ ca - 120 °) / 2, phase C compensation Φ0c= -（Φca -120°）/2.
This method actually averages the resistance of phase A and C, and it is greatly likely to
cover up the existing problems. Therefore,it is recommended to assess the original data

7
without automatic compensation, (namely the compensation angle is 0°), and assess the
trend of change.
VI.Functions Of Panel Aand Components
6.1 Host Panel Diagram And Interface Board Diagram
Host panel diagram and interface board diagram are shown in figure 3.
6.1.1 Current input:
Phase A, B and C are three input channels, when measured in single phase,
currents of phase A, B, and C are channeled from A.
6.1.2 Reference signal input:
For cable test mode, compatible communication cableis used to connect voltage
collector; and for induction test mode, it is used to connect the sensor plate and
input the electric field signal.
Phase C
Reference
ON/OFF
Antenna
signal Current Phase B
Current Phase A Current

8
Fig.3 Host panel diagram and interface board diagram
1：Current input；1：
RS485A；
2：Earth；
2：RS485B；
3：NC.
3：Inductive voltage input；
4: Earth.
5.1.3 LCD screen:
Industrial grade 640 * 480 dot matrix high brightness color LCD screen, displaying
operation menu, test data, waveform and so on.
5.1.4 Keys:
Used for operating the instrument. "↑ ↓" refers to"up and down", used to move or
modify the data; "← →" refers to the "left and right", used to move or modify the
data; "ENTER" is used to confirm the current operation; and "CANCEL" is used to
give up the current operation.
5.1.5 Antenna:
When using the wireless test mode, please install the compatible antenna on the
antenna seat so as to receive the wireless signal well. The wireless
communication distance will be greatly shortened if not installing the antenna.
5.1.6 USB interface:
Used to connect the externalU disk. Please use FAT or FAT32 format U disk to
store test data. In the storage process, it is strictly prohibited to dial out the U disk.
5.1.7 RS232 interface:
This interface is an external printer interface for connecting external printer. It can
print test results, and the printed content can be selected. There is no need to print
the unconcerned data so as to save printing paper.
5.1.8 DC IN:
Instrument charger interface, please use the compatible charger of the instrument.
5.1.9 Switch:
Instrument power switch, please switch off the instrument power supply when it is
1 2
3
1
23
4

9
not in use in order to save battery power.
6.2 Front And Rear Panels Of The Voltage Collector
The front and rear panels of the voltage collector are shown in Figures 4 and 5.
6.2.1 Communication interface:
For wired test mode, compatible communication cable is used to connect
instrument host reference signal input.
6.2.2 Antenna:
When using the wireless test mode, please install the compatible antenna on the
antenna seat so that the voltage collector can transmit the wireless signal
effectively.Without installing an antenna, the wireless communication
distance will be greatly shortened, and the internal wireless module may be
burned if the using time is too long.
Voltage Collector
Fig.4 front panel of voltage collector Fig. 5 rear panel of voltage collector
6.2.3 Keys:
Used for operating instruments. "↑ ↓" refers to "up and down",used to move or
modify the data; "→" refers to "right",used to move or confirm the operation; and
long press "→" will enter the setup menu interface.
6.2.4 LCD screen:
Industrial grade 128 × 64 dot matrix OLED LCD screen, display the operation
menu and test data.
6.2.5 Send indicator:
The data indicator flashes once when the voltage collector sends date through
wireless or wired way.
6.2.6 Charging port:

10
Instrument charger interface, please use compatible charger for the instrument.
6.2.7 Switch:
Power switch of voltage collector, please switch off the power supply when it is not
in use in order to save battery power.
6.2.8 Voltage input:
Reference voltage input is divided into phase A (yellow line),phase B (green
line),phase C (red line) and neutral point or ground line (black line). Choose the
reference phase for the single phase, and both phase A, B, C, AB, and CB are
input from phase A (yellow line) and black line.
Note: If the PT secondary side is phase Bearthed, phase A (yellow line) is
connected to PT secondary side phase A, the black wire is grounded, and the
reference phase of the instrument host selects "A-B"; or phase A (yellow line)
is connected to PT secondary side phase C, black line is grounded, and the
reference phase of the instrument host selects "C-B".
The input line is connected in series with 120mA self-healing insurance.
1.
Phase A voltage input;
2. Phase B voltage input;
3. Phase C voltage input;
4. Earthed
5. NC
6.2.9 Grounding Pole:
During the test, the instrument must be earthed reliably. Connect the ground wire
before connecting other test wires. After the test, the ground wire is removed to
ensure personal safety.
VII.Operating Instructions
Before testing, the instrument host and voltage collector shell should be reliable
earthed (the host is grounded by the black clamp of the current test wire), and correctly
1
234
5

11
connect wires according to different test ways.Please refer to the "7 test wiring" for wiring
instructions under various test modes. When using the wireless test mode, the voltage
collector should be placed in a higher position (e.g. on the PT terminal box), which can
prolong the wireless communication distance.
7.1 Intelligent Power Management
When the instrument is not in operation for a long time, it will automatically reduce the
brightness of the backlight of the LCD screen to save the power, and display the prompt
window to prompt the user to turn off the power of the instrument by voice. The instrument
has the function of low-power prompting. When the instrument is low in power, the
charger can be plugged in for charging, and the instrument can be operated normally
during charging.
7.2 External Printer Instructions
The external printer is connected to the instrument host with the compatible
connection wire. The green indicator on the external printer interface is the power
indicator, and the yellow one is the data indicator. After the external printer is connected
successfully,the green indicator light on the RS232 interface of the instrument host is on,
and the top status bar of the screen displays the icon of the printer.
The keys and indicator lights of printer are integrated. When the printer is powered on,
normally the indicator light keeps on, while the indicator light flasheswhen the paper is out.
Press the key once, and the printer willfeed paper. When there is pink edge on the printed
paper, it indicates that the paper is about to run out, please feed the printing paper in time.
Self-check of the printer: Press and hold the key when the device is turned off, and
connect the instrument to the power to print out the
self-check bar.
Feed the printing paper: Pull out the revolving wrench, open the cover, load the paper and
pull out a length of paper (a little bit more than the tearing
paper knife). The paper must put in order, and the direction of
the paper is the liquid side (smooth surface) up. Close the

12
paper cover, after the print head axle pressed paper straight,
push the print head axle hard back as while as reset the
rotary wrench, and push the rotary wrench into the reset.
7.3 Host Operating Instructions
Turn on the power switch of the instrument host and enter the boot screen after the
instrument is initialized (see figure 6), on which it will display the device model, software
version number and hardware version number; then the instrument will automatically
enter the main menu.
Fig .6 Boot Screen Fig. 7 Main menu
7.3.1 Main Menu
The "main menu" screen is shown in figure 7. The top status bar shows the current
date, time, the insert status of the U disk, the connection status of the external printer, the
test mode (and corresponding additional information), and the battery power of the
instrument host. The bottom displays software version number, hardware version number
and device number. The middle is the model name of the instrument and the optional
function menu.
Press the up and down keys to select the corresponding function menu; press the
"ENTER" key to enter the selected function menu; "system parameter setting" menu is for
debugging in the factory, and it is not open to users.
● Wireless test mode, which shows the battery power of the voltage collector and

13
the received wireless signal strength. When the power is low, the battery symbol
flickers. When the wireless signal is not received, the wireless signal strength shows
"?", and the alarm will be issued the sound like “di.. di ..di ..” during the test.
● Wired test mode, which displays the status of voltage collector battery and wired
connection. When the power is low, the battery symbol flickers. Connection success
shows up and down arrow mark, and connection failure displays "?",and the alarm will
be issued the sound like “di.. di ..di ..” during the test.
● Induction test mode, which does not display related status of voltage collector .
● This icon indicates that the U disk has been inserted and initialized successfully.
● This icon indicates that the external printer is successfully connected.
7.3.2 Test Parameter Setting
Select "start live test" on the "main menu" screen and press "ENTER" key to enter
"test parameter settings" screen, as shown in figure 8.
Press the up and down key to select the setting items,and press "ENTER" or right key
to enter the specific numerical setting. When the cursor is in the specific numerical
position, press the up and down key to adjust the value, and press "ENTER" key or left
key to return to the project selection.
The prompt window on the right shows the operating instructions and important tips
for the corresponding settings.
Fig.8 Test parameter setting

14
●Test ID : Set the current test number.
●Device ID: The number of the device being tested, which cannot be set.
●Test Mode: The test mode can be wired, wireless and induction. When choosing
wireless test mode, the number at the right of the word "wireless"
indicates the channel value used by the current wireless module.
●Reference: Reference phase.It can be set as ABC, A, B, C, A-B and C-B; when
selecting the induction test mode, it is fixed to phase B.
The ABC represents the simultaneous use of the three-phase voltage
as the reference voltage.
The A, B, and C indicate the use of the single-phase voltage as the
reference voltage.
A-B and C-B indicate the case where the phase B of PT is
grounded,using A-B or C-B as the reference voltage.
When the single-phase voltage is used as the reference voltage,
the reference voltage is input by phase A of the voltage
collector(yellow wire) channel.
●Tested : Tested phase.It can be set as ABC, A, B and C.
ABC represents three-phase simultaneous measurement, namely three
phase currents is entered simultaneously in the three phase current
channels of A,B and C .
A, B, and C represent single phase measurement, and phase A
current channel is used to input current.
●COMP Mode: Compensation mode.It can be set as"No COMP", "Manual COMP"and
"Auto COMP".
"No COMP": disable compensation.Namely the compensation angle is 0°.
When the reference phase is single phase, and it is different
from the tested phase, the instrument automatically sets up
the theoretical compensation angle, as shown in the table
below.

15
Tested
Phase A
Tested
Phase B
Tested
Phase C
Reference Phase ABC
0°
0°
0°
Reference Phase A
0°
120°
240°
Reference Phase B
240°
0°
120°
Reference Phase C
120°
240°
0°
Reference Phase A-B
30°
150°
270°
Reference Phase C-B
90°
210°
330°
"Manual COMP": manual compensation.Manually set the compensation
angles of phase A, B and C, and the setting range is
±360.00°.
Note: There must be a basis for setting the compensation
angle.Arbitrary setting is not allowed!
"Auto COMP": auto compensation.According to the principle of "4.2
phase interference and automatic compensation
principle", the compensation is automatically carried out.
Note: The angle of compensation is always added to the phase
difference between current and voltage, for example, the
phase difference between current and voltage is 80°, and the
compensation angle is 1°,then after compensation, the final
angle of current and voltage is 81°.
●COMP Angle: Compensation angle .Here, the user can view or set the compensation
angle of phase A, B and C. The single phase measurement only shows
the compensation angle of the tested phase.
●PT Ratio: The PT voltage turn ratio is set up under the wired and wireless test modes,
and the turn ratio of the induction test method is invalid. The PT turn ratio
has two sets of settings, which are "custom value" and "preset ratio". The
"custom value" mode can set the turn ratio at will and the "preset ratio"

16
mode automatically calculates the PT turn ratio by selecting the PT first
rated voltage and the PT secondary rated voltage.
●Start Test: After the parameter is set and the cursor is moved to this point;press the
"ENTER” key to start the test process and enter the test data display
screen. In addition, the instrument will save this parameter settings for the
next time to use.
7.3.3 Test Data Display Screen
Test data display screen is divided into the following five ones: main test data,
detailed test data, harmonic test data, waveform test data and parameter settings view.
Afterthe cursor moved to the "Switch", press "ENTER" to switch the screen. For single
measurement,there is no separate waveform test data display screen, and the waveform
test data will be displayed on all the test data screens.
Here, the parameter settings view screen is mainly used to view the parameters of
the test settings and cannot be modified, if the parameter setting is needed to modify,
please return to the "test parameter setting" screen.
Main test data screen is shown in Figure 9; detailed test data screen is shown in Figure
10; harmonic test data screen is shown in Figure 11; waveform test data screen is
shown in Figure 12; and parameter setting view screen is shown in Figure 13.
Fig.9 Main test data screen Fig. 10 Detailed test data screen

17
Fig. 11 Harmonic test data screen Fig. 12 Waveform test data screen
● This symbol is displayed during the test and blinks.
● This symbol is displayed when the test is paused and blinks.
Click the "Test" key to enter the test state; click "Pause" key to enter the pause state;
Under the test state, the instrument can only switch the display screen, but cannot save
data, print,upload and perform other functions. Under the pause state, the screen will
display "Save", "Print", “Upload"keys, and the users can save, print,upload and perform
other operations.
7.3.4 Test Data Specification
●System frequency: The upper right
corner of the screen shows the frequency of the
system collected by the instrument.
●Three phase voltage angle: Three phase
simultaneous measurement shows three-phase
voltage angle Φa-b, Φb-c and Φc-a; single-phase
measurement does not display those angles.
Fig. 13 parameter setting view screen
●Ux: The reference voltage effective value contains only the fundamental wave and the 3,
5 and 7 harmonics，the formula is:
Ux = U12+ U32+ U52+ U72