Huazheng HZJF-9041D User manual

HZJF-9041D
Partial Discharge Detector
User Manual
Huazheng Electric Manufacturing (Baoding) Co., Ltd

Dear use r:
Thank you for choosing HZ JF -9041D Pa rtial Dis ch arge Detector.
We hope that this instrum ent can mak e your wo rk easier an d mo re
en jo ya bl e, so tha t you can ge t th e feeli ng of office aut om at ion in the test
an d analysis work.
Before using the instrument, please read this man ua l, an d op er ate and
maintain the inst rume nt according to the manual to pro lo ng its service lif e.
"Just a lig ht pr ess, th e test wi ll be completed automatically " is the
op er atin g charact eristics of this inst rument.
If you ar e sat isfied wi th th is instrument, please tell you r co ll eagues;
if yo u are no t sat isfied wi th this inst rume nt, ple as e call [phone] to
tell you to serve you at all tim es-Baoding Hua zh en g Electric Ma nu factur ing
Co. , Ltd., our company will defin itely make you satisfie d !

Contents
I.Overview......................................................................................................................................... 1
II.Main Technical Indicators............................................................................................................1
III.Operating Principle..................................................................................................................... 3
IV.Structure Description..................................................................................................................4
V.HZJF-9041D Description Of Front Panel And Rear Panel Components........................... 5
VI.Operating Instructions................................................................................................................6
VII.Packing list................................................................................................................................24
VIII.User selected equipment (Optional need extra money）............................................ 24

1
I.Overview
HZJF-9041D partial discharge detector is a new type of digital partial discharge
detector developed by our company. It retains the advantages of HZJF-9041 partial
discharge detector, reduces the volume and optimizes the performance. It uses 10.1 inch
touch screen to replace the traditional operation mode of oscillograph and physical knob,
making it more convenient to use.
The instrument adopts full touch screen operation, which not only improves the
service life of the operation, but also has the following functions: one key automatic
correction; high voltage test voltage divider ratio can be set; serial communication upload
test data. The instrument has the characteristics of high sensitivity, wide application range,
wide dynamic range of amplification system, multiple frequency band combinations (nine
kinds), and strong anti-interference ability. It is a practical partial discharge testing
instrument widely used by electric power departments, manufacturers and scientific
research institutes.
II.Main Technical Indicators
1. The equivalent capacitance ranges from 6pF to 250 μ F
2. Number of channels: Four channels
3. Measurement range: 0.1pc-10000nc
4. Detection sensitivity and allowable current (see Table 1)

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NO.
Tuning
Capacitance
Range
Sensitivity
(PC)
(Unbalance
d Circuit)
Effective Value Of
Allowable Current
Unbalanc
ed Circuit
Balance
Circuit
1
0～25～100pF
0.02
30mA
0.25A
2
25～100～400pF
0.04
50mA
0.5A
3
100～400～1500pF
0.06
120mA
1A
4
400 ～1500 ～
6000pF
0.1
0.25A
2A
5
1500 ～6000 ～
25000pF
0.2
0.5A
4A
6
0.006 ～0.025 ～
0.1μF
0.3
1A
8A
7
0.025～0.1～0.4μF
0.5
2A
15A
8
0.1～0.4～1.5μF
1
4A
30A
9
0.4～1.5～6.0μF
1.5
8A
60A
10
1.5～6.0～25μF
2.5
15A
120A
11
6.0～25～60μF
5
25A
200A
12
25～60～250μF
10
50A
300A
7R
Resistance
0.5
2A
15A
Table 1. Detection sensitivity and allowable current value of input unit
5. Elliptic scan time base
(1) Frequency 50/60, 100, 150, 200, 400Hz
(2) Rotation: 30 ° as the first gear, and can rotate 120 °
(3) Working method: ellipse sine wave straight line
6. Display unit
10.1 inch capacitive touch screen is used.
7. Amplifier
(1) 3dB low frequency fl:10, 20, 40KHz optional
(2) 3dB high frequency fh:80, 200, 300kHz optional
(3) Gain adjustment, rough adjustment 6, inter gear gain difference 20 ± 1dB, fine
adjustment range >20db
(4) Asymmetry of positive and negative pulse response ＜1dB

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8. Time window
(1) Window width: adjustable, 5 ° ~ 170 ° at 50Hz
(2) Window position: each window can rotate 0 ° ~ 170 °
(3) Two time windows can be opened separately or simultaneously.
9. Peak pulse display
The touch screen displays 1 decimal place (10pc or more), 2 decimal places (less than
10pc), error: ± 3% (in full scale)
10. Test voltage display
(1) Range 150kV
(2) Input impedance: >1m Ω
(3) Display: touch screen display, display 1 decimal place
(4) Error: ± 1%
11. Test frequency display
Error: less than ± 1%
12. Zero standard system
Zero sign is consistent with all ellipse scanning frequencies
13. Structure
(1) Dimensions: 370mm (width), 460mm (depth), 215mm (height)
(2) Weight: about 12.5kg
III.Operating Principle
When the sample CXproduces partial discharge under the test voltage, the pulse
current is generated through the coupling capacitor Ck, and the pulse signal is picked up
by the input unit. After being amplified by low noise preamplifier, filter amplifier and main
amplifier (reaching the required amplitude), the visible discharge pulse is generated on
the elliptical scanning baseline of the touch screen, and the pulse peak value is displayed
at the same time. The time window unit selects the working time of the pulse peak meter
in each cycle of the test voltage, and marks the corresponding display area of the touch
screen in red during this working time, which can avoid the interference of fixed phase,

4
which is a conventional discharge test method.
When using JZF calibration pulse generator to inject the known electric quantity of
sample CX, through automatic correction, the display value of discharge capacity is
consistent with the injected electric quantity, so the discharge quantity of the tested object
can be read out directly on the touch screen during the voltage test without calculation,
which is very convenient.
The working principle of the product can be seen in the block diagram (Figure 1)
Figure 1HZJF-9041D Block diagram of partial discharge detector
IV.Structure Description
The instrument is a desktop standard cabinet structure. The operation surface of the
instrument is divided into two parts: front panel and back panel. The positions of each
component are shown in Fig. 2a and 2b

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Figure 2a HZJF-9041DSchematic diagram of front panel of partial discharge detector
Figure 2b HZJF-9041DSchematic diagram of back panel of partial discharge detector
V.HZJF-9041D Description Of Front Panel And Rear
Panel Components
1. Touch screen: display the measured PD waveform, PD, test voltage, test frequency
and other parameters;
2. Power switch button: press once to turn on; press again to turn off;

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3. Partial discharge input: partial discharge measurement signal input, HZJF-9041D has
four channels, the signal can be accessed from any channel;
4. High voltage voltage divider, voltage range: 150V;
5. Grounding bolt: reliable grounding is required during test;
6. RS232 port: through this serial port, the parameters of partial discharge instrument can
be uploaded to other equipment;
7. External power supply input;
VI.Operating Instructions
（1）Preparation test
1. Check the grounding condition of the test site. Connect the grounding bolt 5 at the back
of the instrument with the grounding wire of the test site with thick copper wire (preferably
braided copper tape). The grounding short circuit piece of the input unit should also be
properly grounded.
2. According to the size of the test capacitor CX coupling capacitance CK, select the
suitable serial number input unit. In Table 1, the tuning capacitance refers to the
equivalent capacitance seen at the two ends of the primary winding of the input unit
(which can be roughly estimated by the series value of CX and CK).
The input unit should be as close as possible to the tested object. The Q9 socket of the
input unit is connected to the amplifier input socket 3 (channel 1) on the back panel of the
instrument through an 8-meter long cable.
3. There are several methods to connect the sample to the input unit (see Figure 3).
Figure 3a Parallel connection

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Figure 3b Series connection
Figure 3c Balanced connection
Figure 3d Bridge tapping method
In the figure: CX -- sample; CK -- coupling capacitance; Z -- blocking impedance;
R1, C1, R2 and C2 are the balanced regulating impedances.
4. Connect the resistance voltage divider or capacitor voltage divider at the high voltage
end, and connect its output to the input socket 4 of back plate "connected to high voltage
voltage divider" through the measuring cable.
5. The common partial discharge test circuit is shown in Figure 4