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Summary of Contents for Huazheng HZJF-9041D
- Page 1 HZJF-9041D Partial Discharge Detector User Manual Huazheng Electric Manufacturing (Baoding) Co., Ltd...
- Page 2 (0312) 6775656 to tell you to serve you at all times- Baoding Huazheng Elect ric Manufact ur ing Co. , Lt d. , our company will def initely make you satisf ied !
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Page 3: Table Of Contents
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... -
Page 4: I.overview
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. - Page 5 Effective Value Of Sensitivity Tuning (PC) Allowable Current Capacitance (Unbalance Unbalanc Balance Range d Circuit) ed Circuit Circuit 0～25～100pF 0.02 30mA 0.25A 25～100～400pF 0.04 50mA 0.5A 100～400～1500pF 0.06 120mA ～ ～ 1500 0.25A 6000pF 1500 ～ 6000 ～ 0.5A 25000pF 0.006 ～...
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Page 6: Iii.operating Principle
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: ±... -
Page 7: Iv.structure Description
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. -
Page 8: V.hzjf-9041D Description Of Front Panel And Rear Panel Components
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;... -
Page 9: Vi.operating Instructions
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;... - Page 10 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"...
- Page 11 Figure 4 Standard connection circuit of partial discharge test (parallel connection of direct method) （2）How to use it Home Screen...
- Page 12 Windowing interface Setting interface Example 1: adjust the working frequency. Step 1: click the working frequency button. Step 2: select the corresponding working frequency in the pop-up menu.
- Page 13 Example 2: select the curve display mode. Step 1: click the curve display button. Step 2: select the corresponding display mode in the pop-up menu. Example 3: setting coarse adjustment gear. Step 1: click the coarse adjustment gear button. Step 2: select the corresponding gear in the pop-up menu.
- Page 14 Example 4: select signal channel. Step 1: click the channel button. Step 2: select the corresponding channel in the pop-up menu. Example 5: window operation. Step 1: click the window opening button to enable the window opening function. Step 2: click the window mode button to select the corresponding selection mode. Step 3: adjust the corresponding window opening area through the window position slider and window length slider.
- Page 15 Example 6: setting interface operation. Step 1: click the setting button to switch to the setting interface. Step 2: click the value box to be set and the keyboard input window will pop up. Step 3: after inputting the corresponding value in the keyboard window, click the input completion button.
- Page 16 menu and "ellipse" in the display mode button menu. Confirm the set PD calibration target value (factory default 50pc). 2. Instrument calibration Refer to figure 4, connect the wire and calibrate it with JZF calibration pulse generator before adding test voltage. Note: the lead wire on the red terminal of the calibration pulse generator shall be as short as possible and connected to the high-voltage end of the test object, and the black terminal wire shall be connected to the low-voltage end of the test object.
- Page 17 length" to avoid the interference pulse. 4. Partial discharge test with frequency higher than 50 Hz When partial discharge test higher than 50 Hz is required, press the "working frequency" button to select the corresponding frequency range, and take 10v-250v test voltage from high frequency test power supply and send it to socket 4.
- Page 18 There are several situations: 1) if the discharge amplitude increases with the increase of test voltage, and the discharge waveform becomes indistinct, it is often that there are many bubbles in the dielectric or discharge on the surface of the dielectric; 2) in addition to the above conditions, if the discharge amplitude increases rapidly with the pressure time (up to 100 times or more), it is often the bubble in the insulating liquid Discharge, a typical example is the discharge of oil impregnated paper capacitor.
- Page 19 Some cases which are mainly considered as interference or abnormal discharge are discussed below. （3）Suspended potential object discharge (see Fig. 7a), waveform characteristics: it appears in two quadrants of positive and negative half cycle before the voltage peak, the amplitude, pulse number and position are the same, sometimes (as shown in Fig. 7b) appear in pairs, the discharge can move, but the mutual interval between them remains unchanged, when the voltage increases, the number of elements increases, the interval decreases, but the amplitude remains unchanged, and sometimes the voltage rises to a...
- Page 20 Fig. 8a Fig. 8b (5) Tip corona in liquid medium (Fig. 9a), waveform characteristics: discharge occurs in two and a half cycles, symmetrically distributed in two voltage peaks. Each group of discharge is equal interval, but a group of larger amplitude discharge appears first, and increases with the increase of test voltage, not necessarily equal amplitude: a group of small amplitude discharge amplitude is equal, and does not change with voltage (as shown in Fig.
- Page 21 Fig. 9 （7）Thyristor element (Fig. 11a), waveform characteristics: fixed position, each element generates an independent signal. When the circuit is connected and the electromagnetic coupling effect is enhanced, the signal amplitude increases. During the voltage regulation test, the pulse signal will generate high frequency waveform broadening, thus increasing the space occupation (Fig.
- Page 22 Fig. 13 (10) Fluorescent lamp (Fig. 14), waveform characteristics: fence like, pulse with the same amplitude, with two clusters of pulse groups symmetrically appearing in positive and negative half waves. Reason: fluorescent lamp lighting. Fig. 14 (11) Waveform characteristics of radio interference (Fig. 15a, FIG. 15b): high frequency sine wave with amplitude modulation, independent of test voltage.
- Page 23 (13) Medium and high frequency industrial equipment (Figure 17), waveform characteristics: continuous occurrence, only within half a cycle of power waveform. Cause: induction heating device and ultrasonic generator with frequency close to detection frequency, etc. Figure 17 (14) Core magnetic saturation harmonic (Fig. 18), waveform characteristics: lower frequency harmonic oscillation, appeared in two and a half cycles.
- Page 24 Fig. 19 (16) The waveform characteristics of leakage trace and branch discharge: the discharge signal waveform does not conform to the general typical image, and the waveform is irregular and uncertain. Cause: electric leakage on the polluted insulation or carbonization trace or branch passage caused by partial overheating of insulation. In the discharge test, it is necessary to ensure that other components (test transformer, blocking coil, coupling capacitor, high-voltage resistance, etc.) in the test circuit will not discharge.
- Page 25 of large capacitance test object, as long as there is a small mutual inductance m, the inductive coupling effect is very strong; ③ grounding coupling: This is mainly caused by multi-point grounding, and the current flows through two grounding points in the grounding system, thus establishing an interference voltage in the test circuit;...
- Page 26 Fig. 20a Fig. 20b (4) High voltage filter is used. Adding a high-voltage filter to the high-voltage side of the secondary of the test transformer can further suppress the interference of the power grid system and improve the detection sensitivity. As shown in Fig. 21, the two-stage T-shaped filter can attenuate the 30kHz signal by 60dB if l = 0.5h and C = 0.004f.
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Page 27: Vii.packing List
(9) The test circuit is far away from surrounding objects, especially suspended metal objects. VII.Packing list Item Special measuring cable (standard configuration: 8m) Power cord VIII.User selected equipment (Optional need extra money） 1. Input unit: no.1-12, suitable for 6pf-250 μ F test sample; in addition, 7R input unit can be selected for length measuring cable, optional;...
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