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真空度测试仪（英）
真空度测试仪（英）
Vacuum measurement instrument is a vacuum interrupter chamber vacuum testing equipment. It single-chip computer as the master unit, the testing process is fully automated. The instrument has changed in principle similar products at home and abroad to do with the current peak calibration methods, and the use of ionizing charge to do the calibration. Vacuum tester so that the physical principle a better accuracy, but also effectively suppressed during the test pulse power supply interference, the test is stable and reliable. The instrument uses two sampling methods deduction due to environmental factors resulting leakage current, and in the measurement process to be completely leak discriminant vacuum interrupter, vacuum tester so that the vacuum interrupter chamber measurement is more accurate and reliable. Currently, there are 35 instruments have been measuring the vacuum interrupter standard curve, covering the vast majority of domestic and international casts. The instrument is reliable quality, beautiful shape, easy to use.
I. Overview of the vacuum gauge vacuum circuit breaker is commonly used in power system high voltage electrical appliances, the core component is vacuum interrupter, the interrupter chamber is vacuum condition as a working basis, vacuum tester so it's not like oil switch, SF6 switch as easy to detect its quality. Traditionally, vacuum circuit breakers user to determine the degree of vacuum interrupter is frequency voltage method, this method can only be roughly determined by the seriousness of the vacuum interrupter. RXZK type vacuum tester is a vacuum degree of vacuum interrupter identification equipment, which the magnetron discharge as a principle, single-chip computer as the main unit, the testing process is fully automated. The instrument's sampling design from the past with the current peak calibration methods, and the use of ionic charge to do the calibration. Thus, effectively inhibited the transient power supply during the test interference, the test is stable and reliable. As a result of the computer as the main control unit, the instrument can be easily generated due to environmental factors, net leakage current. The most prominent feature of this instrument are: to achieve a vacuum interrupter to avoid demolition measurement, vacuum tester vacuum directly display values, so that the vacuum breaker user details to master interrupter vacuum state, as there are plans to replace the interrupter chamber to provide a reliable basis for the safe operation of the grid provides a strong guarantee, overcame frequency voltage method can only determine whether the arc chamber scrapped defects. The measurement precision, simple operation, easy to carry, anti-interference ability, especially for field testing power supply unit, a vacuum circuit breaker production, installation, commissioning and maintenance of the necessary equipment.
Second, the vacuum gauge testing principles will interrupter two open contacts pull a certain distance, high-voltage pulse is applied to the solenoid coil surrounds the outer arc chamber, a large current through the coil, resulting in the interrupter generating a pulse synchronized with the high magnetic field, so that the role of the pulse magnetic field, the electrons do interrupter spiral motion and collisions with residual gas molecules ionized, and the ion current generated by the residual gas density is approximately proportional to the degree of vacuum relationship. For different vacuum, vacuum tester under the same vacuum conditions, the ion current is not the same size, when the measured ion current is known, by means of a vacuum ion current curve, the computer automatically calculate the degree of vacuum, and the display vacuum level.
Third, vacuum measurement instrument panel schematic
four, vacuum measurement instrument technical parameters 1. vacuum measurement range: 9.999 × 10-1 ~ 1 × 10-5 2. ionic current measurement range: 9.999 × 10-1 ~ 1 × 10-73. measurement error: <10% 4. Measurement resolution: 10-5pa 5. Permissible ambient temperature: -20 ℃ ~ 50 ℃ 6. air humidity: ≤ 80% RH 7. Power: AC, 220V, 50Hz ± 10% 8. Dimensions: 420 × 290 × 210 (mm) 9. voltage output: Pulse 30kV15kHz ⒑ Weight: 8kg
five, vacuum tester using the method (1) of this instrument are two purposes: 1, the vacuum interrupter interrupter production line quality control, circuit breaker manufacturers interrupter storage testing. 2 for detecting machine installed in the switch on the vacuum interrupter chamber vacuum. Such testing is mainly used for the electricity sector in routine maintenance and capacity test the capacity of the vacuum interrupter chamber judgment. (2) Connection: vacuum tester on the panel magnetron current output is connected through a wire coil with magnetron make interrupter contacts as sub-state (line trap at interrupter outdoor), the high-voltage lines and signal input lines are connected to the movable end of arc chamber and the static side. Note that the power lines should be left open (as shown).
Note: Before using the instrument must be well grounded! Coil and high voltage output terminal should allow sufficient distance. Check the correct connection can be switched on. The instrument's power is turned on, the display shows the menu as follows:
(3) vacuum tester tube options: measurement, first select the tube, the instrument has been deposited in a variety of tube type, specific parameters see appendix form. 1, tube-type selection mode of operation: Press [select button] to make [◢ ◢] point to select the test tube, press [Enter], use [+ key] or [- keys] to adjust tube parameters, when the display shows the tube Type the desired measuring tube can be consistent code and press [Enter] to return to the main menu. If the manual does not give the tube to be measured, the available sizes are similar, the same tube wiring replaced. 2, the measurement press [Select key] to make [◢ ◢] to the test tube "Pa", press [Enter] instrument is in measurement mode. And automate all measurement, calculation and display of the whole process. 3, printing: To print the test data, press [Enter] return to the main menu, press [Select key] to make [◢ ◢] to print the test data, and then [Print button], you can print out all measurement data. 4, if no alternative parameters, you can press [Select key] to make [◢ ◢] point "A", this can be given directly ionization current, in general. Ionization current (A) compared to vacuum (Pa) Small two orders of magnitude. Measuring instrument computer to perform the following steps: Start the high pressure → → automatically close the leakage current measured pressure, turned the charging voltage to the specified value switch → → Restart pressure, and start magnetron current measuring leakage current + leakage current → charged ionizing leakage current → current value into a vacuum → display, print. If [A key measure] effective vacuum tester will display the current value. The instrument uses two high-pressure method starts, if the instrument first start high and then back to the initial state, this time for the instrument refuse to submit. Should check whether in the closed state of the vacuum tube, if not, then the tube has been completely serious leak or spill.
Sixth, the hardware configuration of the vacuum measuring instrument hardware ZKY-2000 is broadly divided into four parts
1, CPU control unit for receiving user instructions of the section, controls the display of various display unit generates a high voltage pulse signal required, and the magnetron current control unit sends various control commands, responsible for the entire measurement process precise timing control, the unit is the main body of the entire system. 2, the high pressure part of the magnetron current control panel sent to the control section with a certain duty cycle signal power amplification to drive high-voltage transformer to produce high voltage required for measurement. Vacuum tester magnetron current control section for receiving a control instruction for charging, threshold comparison, the loopback state and starting operations such as magnetron current. 3, the key part of the display panel buttons for user instructions, manipulating keys of the instrument in different working conditions. A display portion for displaying system parameters. 4, the printer is used to print out the measured parameters, the print results are as follows: TESTED BUIC-Ⅲ TESTED BYUC-Ⅲ PRESSURE: 3.260E-5Pa CURRENT: 2.621E-6A (vacuum level) (leakage current) TUBE NO : (tube No.) TUBE NO: (tube No.) TUBE TYPE: (tube type) TUBE TYPE: (tube type) DATE: (date) DATE: (date) TEST REPORT TEST REPORT (inspection records) (inspection records)
VII. vacuum gauge Caution 1, this instrument is a precision instrument, the circuit board wiring density greater than the general requirements stored in a dry place. If more humid environment, you should always energized. 2, if the current value of zero is displayed after the test, you should check the arc chamber surface is clean. Because the surface is dirty may change the value of the leakage current value is greater than the ionization, so that after the measured value of the leakage is less than zero, and the judgment by the instrument to zero. After this occurs, the surface of the interrupter Sassafras clean, do the test, in general vacuum values ​​thus obtained more accurate. 3, when used, must not touch the high-voltage output line body to prevent electric shock. 4, high-pressure light is on, do not touch the high-voltage lines and magnetron current lines, in order to prevent electric shock. 5, easy printing paper in the instrument first case of power failure to avoid damaging the printer. Vacuum tester for paper, the front panel is open, with the index finger and thumb to pinch the ends of the two clips printer gently out of the printer, eject mouth slightly instrument panel, but can not drag distance is too large, New Port section cut tip-like paper, insert the paper into the printer port, turn on the instrument power switch, press the print button, so that the upper end of the paper from the printer out some distance into the panel exit slit exported. Cover panel of the printer, paper loading is completed. 6, the instrument has no user-serviceable parts, such as faulty, professional maintenance, or contact the vendor, do not attempt to open the instrument, in order to avoid accidents or unnecessary losses. 7, the instrument vacuum measurement range of 9.999 × 10-1 ~ 1 × 10-5 between the ion current measurement range of 9.999 × 10-1 ~ 1 × 10-7, and when the vacuum tubes is greater than 10 - 2 Pa or ion current is greater than 500uA is recommended that the vacuum scrapped. 8, if the vacuum pressure is equal to atmospheric pressure (ie, vacuum tube breakage), the measurement range of the instrument, the instrument will decline the test, return to the initial state. (Note: after the breakdown, there may be the instrument display is not normal at this time, press the "reset" button, the instrument back to its normal state.)
eight, vacuum gauge Annex 1, vacuum tester plug coil a 2, magnetron current output line a 3, the signal input line a 4,5 A, 30A fuse the two 5, power lines a 6, a 7 manual, warranty card, certificate of an eight, printing paper two Volume
Appendix 1, JB 3855-1996 assembly for a vacuum circuit breaker vacuum interrupter chamber gas pressure should be less than 1.33 × 10-3 Pa; 2, DL 403-91 use of the prescribed period, the vacuum switch tube not be higher than 6.6 × 10-2 Pa.
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