The characteristics and precautions of the ratio tester
Using modern electronic technology, a new generation of automatic ratio tester has been developed, which has the advantages of small size, light weight, high precision and good stability. The ratio tester adopts large-screen LCD Chinese character display and menu operation, and the interface is clear, and the variable ratio group can be measured at one time. Variable ratio tester is the ideal test instrument for the power industry
Product Usage
The ratio test is one of the routine test items in the transformer manufacturing and overhaul process. The ratio tester is designed with modern electronic technology. The instrument operation is controlled by the single-chip microcomputer. The large-screen LCD screen can visually display the three-phase ratio, error and points. In connection with the position and other information, the instrument is designed with the longitudinal test function of the tap winding. It can automatically judge the tap position and store the corresponding ratio. The instrument is suitable for the ratio test of various wiring group transformers including the Z type.
Features
1. Automatic measurement wiring group
2. Automatic group change, can directly measure the ratio of all transformers
3. Automatically switch phase sequence
4. Automatic switching range
5. Automatic calibration
6. After inputting the standard ratio, the relative error can be calculated automatically.
7. Once the measurement is completed, the test voltage is automatically cut off.
8. Set the data, the measurement results are automatically saved, you can view the previous data.
Precautions
1. In the middle of the measurement, people should not touch the sample.
2. If the test line is short-circuited, the high and low voltages are reversed and the fuse will be blown. After the fuse is blown, if the measurement is made, stop after displaying "Measuring, please wait!". Please shut down, replace the same capacity insurance, retest.
3. The connection should be well protected. The instrument should be well grounded!
4. The workplace of the instrument should be kept away from strong electric fields, strong magnetic fields, and high-frequency equipment. The power supply interference is as small as possible, and the lighting line should be selected if the power supply interferes.
Product album
Product album
Still larger, it can be charged by the AC purification power line instrument. The capacity of the AC purification power supply can be greater than 200VA.
5. When the instrument is working, if the LCD display is disordered, press all the buttons are not responding, or the measured value is far from the actual value, please press the reset button, or turn off the power and then operate again.
6. If the display does not have a character display, or the color is very light, adjust the brightness potentiometer to the appropriate position.
7. Working in a dark place, you can turn on the backlight. To reduce the power consumption of the display, the backlight is not very bright.
8. The instrument should be stored in a dry and ventilated place.
Safety measures
1. Please read this manual carefully before using this instrument.
2. The operator of the instrument should have common knowledge of the use of general electrical equipment or instruments.
3, the instrument can be used inside and outside the house, but should avoid the use of rain, corrosive gas, excessive dust, high temperature, direct sunlight and other places.
4. The instrument should avoid severe vibration.
5. Maintenance, care and adjustment of the instrument should be carried out by professionals.
6. The yellow, green and red of the test clamps should not be connected to the A, B and C of the transformer.
7. Do not reverse the high and low voltage cables.
8. When using the single-phase transformer, only use the yellow and green clips. Do not use the wrong ones. Do not use the test clips to hang.
Test purposes
1. Check if the ratio is consistent with the nameplate value to ensure that the required voltage conversion is achieved.
2. Check if the voltage tap changer indicates the correct position.
3. Check the turns ratio of each coil to determine whether there is a turn-to-turn short circuit in the transformer.
4. Measure the imbalance of the transformation ratio of the three-phase transformer itself.
5. Provide the accuracy of the transformation ratio to determine whether the transformer can run in parallel.
Method of operation
1. Inline: Turn off the power switch of the instrument and wire it as follows. Single-phase transformer three-phase transformer instrument transformer instrument transformer AAAABXBBC not connected CC aaaabxbbc not connected cc transformer neutral point is not connected
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Album
Instrument, not connected to the earth. Connect the instrument ground wire. Plug one end of the power cord into the power socket on the instrument panel and the other end into the AC 220V power supply. Note: Do not reverse the high and low voltage of the transformer! Set the wiring method to set the standard ratio Start data measurement View historical data 选择: Select Confirm: Execute 2. Turn on the instrument's power switch, and the main menu will appear on the LCD screen as shown below. The selected menu is displayed in reverse (white on black). At this time, press the "↑" button to select the function menu. Press the "Confirm" button to execute the corresponding function. Note: Press the button, release the button, and set the wiring method for one key input: Yy sets the standard ratio to start the data measurement to view the historical data 选择: Select Confirm: Save 3. Connect the settings, enter the wiring method settings, the LCD screen displays as follows, press the " ↑ " key to select the connection, press the "confirm" button to save the connection Method, return to the main menu to set the wiring method to set the standard ratio ratio = 25.000 to start measuring data to view historical data →: shift ↑↓: increase or decrease confirmation: save 4. set the standard ratio, enter the standard ratio setting, the LCD screen The display is as follows: Press the " → " button to select the data bit. The selected data is displayed in reverse. Press the "↑" and "↓" keys to modify the data. After selecting the number, press the "↑" and "↓" keys, the number will be cyclically changed from 0 to 9. If it is the first digit, the number can only be changed from 1 to 9 cycles, and 0 will not appear. After selecting the decimal point, press the "↑" and "↓" keys to move the decimal point. Set the wiring method to set the standard ratio to adjust the ratio = 0.00% to start measuring data to view the historical data →: shift ↑↓: increase or decrease confirmation: save if the transformer has gear, the standard ratio set here, is the standard of the intermediate file Change ratio. After pressing the "Confirm" button to save the ratio, the LCD screen displays the following method for setting the voltage regulation ratio and the standard variable ratio setting method. If the transformer has a gear position, set it according to the actual value, otherwise, set it to 0.00%. Press the "Confirm" button to save the voltage regulation ratio and return to the main menu. 5. After starting the warm-up for 5 minutes, select "Start Data Measurement" and press the "Confirm" button to display the following connection = Yy? Ratio = 25.000? → :No Confirmation: Yes: The ratio displayed on the shift screen is the actual standard ratio required for this measurement. Press the "↑" and "↓" keys to modify this value. The amplitude of each modification = the set standard deviation × the voltage regulation ratio. After the measurement is completed, the following 3 times total 3 groups are displayed: 12 points AB: 25.008 0.03% BC: 25.010 0.04% CA: 25.000 0.00% ↑: page turning →: print confirmation: return each time After the measurement is completed, the instrument automatically saves the data and saves up to 30 data. After more than 30, the data is stored in the 30th time, and the first data is cleared, that is, first in, first out. The left side of the first line shows the position of the current data in the historical data, and the right side shows the number of historical data. The second behavior group. The left side of the third line is the ratio of the AB phase, the right side of the third line is the relative error of the AB phase, and so on. If the single phase transformer is tested, only the first three lines are displayed. If the relative error of the measured ratio is greater than 10%, ">10%" is displayed. If the relative error of the measured ratio is less than -10%, "<-10%" is displayed. Press the "↑" button to view the data. Press the "â†" button to enter the print menu. This data can be printed and all data can be printed to clear all historical data. Press the Enter key to return to the main menu.
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