I. Overview

Vacuum circuit breakers are commonly used in power systems. The core components are vacuum interrupters. Since the interrupter is based on vacuum conditions, it is not as easy as the oil switch and SF6 switches to detect its quality. Traditionally, the vacuum circuit breaker user to determine the degree of vacuum chamber is the power frequency withstand voltage method, this method can only be a rough judge the degree of vacuum serious arc chamber.

ZKY-2000 vacuum tester is the vacuum interrupter identification of the vacuum equipment to single-chip computer as the main control unit, the test process fully automated. The instrument sampling design used to change the current peak to do the calibration method , And the use of ion charge to do the calibration. This effectively inhibit the test process of transient power supply interference, so that the test is stable and reliable.As a result of the computer as the main control unit, the instrument can be easily deducted due to environmental factors caused by leakage Current. The most prominent feature of this instrument is: to achieve a vacuum interrupter free demolition measurement, direct display vacuum value, so that vacuum circuit breaker users to master the vacuum chamber of the vacuum state, for the planned replacement of the arc chamber A reliable basis for the safe operation of the power grid provides a strong guarantee to overcome the frequency withstand voltage method can only determine whether the extermination of the defects of the annulus.

The instrument measurement accuracy, simple operation, easy to carry, anti-interference ability, especially for power supply units on-site testing, vacuum circuit breaker production, installation, commissioning, maintenance of one of the necessary equipment.

Second, the test principle

The two contacts of the interrupter are opened at a certain distance, and the pulsed high voltage is applied to collide with the residual gas molecules. The generated ion current is approximately proportional to the residual gas density, that is, Under the same vacuum conditions, the size of the ion current is not the same, when the measured ion current, through the ion current-vacuum curve, the computer automatically completed the calculation of vacuum, and show the vacuum value.

Third, the technical parameters

1. Vacuum measurement range: 9.999 × 10-1 ~ 1 × 10-5

2. Ion current measurement range: 9.999 × 10-1 ~ 1 × 10-7

3. Measurement error: < 5%

4. Measurement resolution: 10-5pa

5. Allowable ambient temperature: -20 ℃ ~ 50 ℃

6. Air humidity: ≤ 80% RH

7. Power supply: AC, 220V, 50Hz ± 10%

8. Overall dimensions: 420 × 290 × 210 (mm)

9. High voltage output: pulse ≤ 30kV15kHz

Weight: 8kg

Fourth, use the method

(1) The instrument is used in two ways:

1, for the vacuum interrupter production line in the arc chamber quality control, circuit breaker manufacturer of the arc chamber inspection.

2, used to detect installed in the switch machine on the vacuum interrupter vacuum. Such detection is mainly used

The determination of the withstand capacity of the vacuum interrupter in the routine maintenance and capacity test of the power supply department.

(2) connection:

So that the arc chamber contact for the sub-state, the high-voltage lines and signal input lines were connected to the end of the arc chamber and static end. Note that the high voltage line should be vacant

Note: Before using the instrument must be well ground! Check the connection is correct after the boot.

After the power of the instrument is turned on, the display menu is as follows:

(3) tube selection:

Measurement, the first choice of tube type, the instrument has been deposited within a variety of tube, the specific parameters see appendix form.

1, tube selection mode of operation:

Press the (select key), make (◢ ◢) point to select the test tube type, press (confirm key), use '+ key' or '- key' to adjust the tube type parameters, when the display shows the tube type and the required measurement tube type Code can be, press the (confirm button), return to the main menu.If the specification does not give the tube to be measured, the size can be similar, the same way to replace the tube type.

2, measurement

Press (select key) to test the vacuum tube 'Pa', press (confirm key) the instrument is in the measurement state, and automatically complete all the measurement, calculation, display the whole process.

3, print:

To print the test data, press (OK) to return to the main menu, press (select key) to make (◢!) To print the test data, then press (print key) to print out all the measured data.

4, if there is no alternative parameters, you can press (select key) to (◢ ◢) point to 'A', which can be directly given the ionization current, in general. Ionization current (A) less vacuum (Pa) small 2 orders of magnitude.

Six, hardware structure

ZKY- hardware is roughly divided into four parts

1, CPU main control unit

Which is used to receive user commands, control the display to display various signals, generate the pulse signal required for the high voltage unit, and issue various control commands to the magnetron current control unit, which is responsible for the precise timing control of the entire measurement process. The main body of the system.

2, high pressure control board

The high-voltage part of the control part of the signal sent to a certain duty cycle power amplification, driving high-voltage transformer, resulting in the measurement of the required high pressure.

3, buttons and display panels

The key section is used for user commands, and the keys are pressed to make the instrument in a different working condition.

The display section is used to display various parameters of the system.

4, the printer

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 value) (leakage current value)

TUBE NO: (tube number) TUBE NO: (tube number)

TUBE TYPE: (tube type) TUBE TYPE: (tube type)

DATE: (date) DATE: (date)

TEST REPORT TEST REPORT

(Inspection record) (inspection record)

Seven, the use of precautions

1, the instrument is a precision instrument, circuit board wiring density, the general requirements stored in a more dry place.If the environment is more humid, it should always power.

2, if the current value after the test is displayed as zero, should check the surface of the arc chamber is clean because the surface is not clean may make the leakage value greater than the ionization current value, so that the measured value minus less than zero after the leakage, To zero. After this happens, the arc chamber surface Sassafras clean, do the test, in general, so get the vacuum value is more accurate.

3, when used, high-voltage output line can not touch the human body to prevent electric shock.

4, high pressure indicator light, do not touch the high voltage line to prevent electric shock.

5, disassemble the paper in the case of the first power outage, so as not to damage the printer.When the paper, the front panel to open, with the index finger and thumb pinch the two ends of the printer gently pull out the printer, The mouth is slightly higher than the instrument panel, but can not pull out the distance is too large, the new paper port part cut into a tip, insert the printer into the paper, open the instrument power switch, press the print button, the paper from the top of the printer out For a distance, insert the panel out of the outlet and sew it. Cover the printer panel and load the paper.

6, the instrument without any user serviceable parts, such as failure, please professional maintenance, or contact with the supplier, do not open the instrument, so as to avoid accidents or cause 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 between the vacuum when the vacuum tube is greater than 10- 2Pa or ion current greater than 500uA recommended when the vacuum tube scrapped.

8, if the pressure inside the vacuum tube is equal to atmospheric pressure (ie, vacuum tube damage), the instrument within the measurement range, the instrument refused to detect, return to the initial state.

(Note: After the breakdown, the instrument may appear abnormal display, this time, after the new boot back to the normal state of the instrument, the instrument must not work at regular times.

Annexes

1, a high-voltage output line 2, a signal input line

3, 5A, two fuses 4, a power cord

5, the use of a manual

appendix

1, JB 3855-1996

The pressure of the vacuum interrupter used to assemble the vacuum circuit breaker should be less than 1.33 x 10-3 Pa;

2, DL 403-91

Within the specified period of use, the degree of vacuum in the switch can not be higher than 6.6 × 10-2Pa.