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The Zinc Oxide Arrester Tester is a special instrument for on-site and laboratory detection of the relevant electrical parameters of lightning arresters. It is widely used in the on-line on-line monitoring (live test) and laboratory (blackout maintenance) tests of zinc oxide surge arresters. Meet the People's Republic of China power industry standard "DL474.5-92 field insulation test implementation guidelines - arrester test" to the surgery. The zinc oxide lightning arrester tester adopts advanced technology such as sampling and control by a microcomputer to measure the total current, third harmonic, resistive current, resistive current peak, capacitive current, and active power of the zinc oxide surge arrester at the power frequency voltage. The voltage and current waveforms and printouts are displayed. The use of large-screen liquid crystal display, Chinese character menu prompt operation, so that the human-machine exchange function is stronger, while providing on-site wiring display. This instrument has the characteristics of simple wiring, high measurement accuracy, and strong reliability.
Zinc oxide lightning arrester tester main technical indicators:
Zinc Oxide Arrester Tester Detailed Parameters At a Glance Measurement Parameters and Range Test Voltage: KV
Third harmonic voltage: KV
Full current (peak):0~20mA
Third harmonic current: 0~20mA
Resistive current (peak):0~20mA
Resistive current peak: 0~20mA
Capacitive current (peak):0~20mA
Arrester power consumption: 0~8W (PT is 1:1)
In addition to displaying the above measurement values, the voltage and full current waveforms can also be displayed.
Measurement error:
Test voltage: ±5%
Full current: ±2%
Resistive current: ±5%
Capacitive current: ±5%
Arrester power consumption: ±5%
input signal:
Voltage signal (low pressure measurement of PT): AC5~200V
Current signal: AC0~20mA
Working power:
AC220V±10%50Hz
This tester is mainly for the following aspects:
1. Thermal breakdown of zinc oxide surge arresters The ultimate cause of thermal breakdown of zinc oxide surge arresters is the thermal power of the zinc oxide surge arrester is greater than the thermal power. The heating power of a zinc oxide valve sheet depends on its current and voltage (current is the active component of the current through the valve).
2. The inside of the zinc oxide surge arrester is not sealed tightly, which will lead to moisture inside the arrester, or moisture immersed in the interior of the arrester, which will increase the total current of the arrester under voltage. When the moisture reaches a certain level, discharge occurs along the surface of the zinc oxide valve plate or the inner surface of the porcelain sleeve, causing the arrester to explode.
The increase in total current caused by moisture in the zinc oxide surge arrester is caused by an increase in resistive leakage current. Detect the change of the active component of the current, according to the amplitude of the waveform and the resistive current can be inferred whether it is damp.
In summary, the above faults can be reflected by the change in resistive leakage current. Understanding the changes in the resistive leakage current of zinc oxide surge arresters can predict whether or not these types of faults occur.
4. Zinc Oxide Arrester Tester Printout If you need to print directly according to the screen prompts, in order to facilitate the user to analyze and save the test data, the instrument will store the test data of the first 20 times, allowing the user to select and print. (After the measurement is completed, the instrument will automatically store the data. The current measured data is stored as the first data in the historical data. The first data in the historical data is changed to the second data, and so on. The secondary data is automatically cleared.)
Instrument packing list:
Host a voltage signal sampling line A current signal sampling line A power cord A fuse Two dedicated protection device A User's Manual A product certificate A copy of:
Main problems in the operation of the zinc oxide surge arrester tester 1. The zinc oxide surge arresters have long-lasted system overvoltage and overcurrent due to the elimination of the series gap. The active component in the current causes the valve plate to heat up, causing changes in the volt-ampere characteristics. Long-term effects can lead to aging of the valve plate and even thermal breakdown.
2. Zinc Oxide Arrester Tester The zinc oxide surge arrester is subject to the impact voltage, and the valve plate will also age under the impact voltage energy.
3. The internal moisture or poor insulation performance of the zinc oxide surge arrester will increase the power frequency current, increase the power consumption, and cause internal discharge in severe cases.
4. The zinc oxide surge arresters are contaminated by rain, snow, condensation, or dust. Due to the different internal and external voltage distributions, a large potential difference is generated between the internal valve plate and the external porcelain sleeve, resulting in radial discharge.
The task to be performed by this instrument is to judge whether the zinc oxide surge arrester valve is aging or damp. Usually, observe the change of the resistive leakage current flowing through the zinc oxide valve during normal operation, that is, observe whether the resistive leakage current increases or not as a judgment basis.
Zinc Oxide Arrester Tester Because of the normal condition of zinc oxide valves, the resistive leakage current accounts for 10% to 20% of the total current. Therefore, it is difficult to observe only the change of the current to determine the change of the resistive leakage current of the zinc oxide valve. Only by separating the resistive leakage current in the non-linear resistance branch from the total current, can it be clearly understood Changes.
Zinc Oxide Arrester Tester Measurement Principles 1. Measurement Principle After the input current voltage is digitally filtered, the fundamental wave is taken out, and the peak value of the resistive current fundamental wave Ir1p=Ix1p.cosφ is calculated by the projection method. Because the fundamental wave value is stable, Ir1p is widely used to measure the performance of the arrester.
The total current fundamental peak value Ix1p is projected as Ir1p in the direction of the fundamental wave U1 (E1), and is projected as Ic1p in the vertical direction. φ is the phase angle of the current-voltage fundamental wave, which contains the selected compensation angle (Figure 7). Zinc Oxide Arrester Tester Therefore, both φ and Ir1p can directly measure MOA performance.
The instrument is warmed up for 5 minutes before starting the measurement.
The following detailed description of the specific operation of the main menu:
Arrester number: press the keypad "," the cursor to "arrester number", press "OK" to enter; press "" key to select the position to be adjusted, this position will be displayed in reverse; press "," key to select, optional The range of letters or numbers is shown in the appendix; after all the bit adjustments are completed, press the "OK" button. (If you do not want to change the arrester number, press "Exit")
Voltage ratio: Under the main menu, press the “,†key to point the “voltage ratio value†and press “OK†to enter; press the “†key to select the position to be adjusted; this position will be displayed in reverse; press “,†Keys are adjusted; after all bit adjustments are completed, press the OK key.
Side-phase correction angle Zinc Oxide Arrester Tester: The adjustment method is the same as above, and the general phase-to-phase interference influence is about 2° 5°. Because of the difficulty in accurately measuring the interference amount, rigid compensation is generally not recommended but set to 0.0°. According to the requirements of regulations, longitudinal comparison of data trends over time. If you need to adjust the side-phase correction angle, refer to the relevant chapters of the “Measuring Principles†below. Phase sequence: Press the “,†key to point the “phase sequence†and press “OK†to enter; press “,†to adjust; press “ OK" button to complete.
Historical data: Point the cursor to "history data" and press "OK" to enter (as shown in Figure 5); there are 10 pages of '0–9' (the current page is displayed in the upper left corner of the screen), 21 data per page . Press “,†to select the data to be viewed. The test time of this data will be displayed at the top of the screen. Press “OK†to display the data of this group; press “Print†to print the data of this group; press “Exit†key. return.
Time adjustment: Under the main menu, the Zinc Oxide Arrester Tester will point to the bottom line and press “OK†to enter; use the “†key to select the year, month, day, hour, minute and second of the item to be adjusted. "keys to adjust, after all adjustments, press "OK" button.
Start measurement: press “,†to make the cursor point to the first line, press “OK†to enter the measurement,
Precautions Before the official measurement, please turn on the power and warm the instrument for 5 minutes to make the measurement data more accurate.
When the reference voltage is taken twice from the PT, the wiring should be carefully checked to avoid secondary short circuit of the PT.
The voltage signal input line and the current signal input line should not be connected wrongly. If the current signal input line is connected to the secondary side of the PT or the measurement terminal of the test transformer, the instrument may be burned.
In the case of input voltage and input current, do not insert or remove the measuring cable to avoid burning the instrument.
After the instrument is damaged, stop using it immediately and notify the company. Do not repair it by yourself. When the instrument is not working properly, the zinc oxide arrester tester should first check whether the power fuse is blown. When there is no input voltage, check whether the fuse at the front end of the test line is blown. Continue to experiment after replacing the type of insurance. If the problem is more complicated, please contact our company (0514-88771807) for the zinc oxide arrester tester.
The instrument must not be placed in a humid and over-temperature environment.
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Thank you for your attention to our products. In addition to this product introduction, the company also has insulation ladders, high-voltage insulation mats, cable fault testers, high-voltage measuring instruments, insulation boots gloves pressure test equipment, power safety equipment cabinets, etc. Introduction, if you are interested in our products, welcome to inquire. Thank you!
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Charged zinc oxide arrester tester performance characteristics and application instructions
Zinc Oxide Arrester Tester Overview: