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

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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

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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

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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

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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

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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

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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

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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