The "National High Voltage Switchgear Standardization Technical Committee" has stipulated in JB8738—1998 "3.6—40.5KV AC High Voltage Switch Vacuum Interrupter" that "internal gas pressure measurement and allowable storage period inspection" is a mandatory test item for units producing and using vacuum interrupters of high voltage switchgear, and specifies that the allowable storage period of the interrupter is 20 years. The internal gas pressure of the vacuum interrupter should be lower than 6.6×10ˉ²Pa.

Inspection method for the allowable storage period of vacuum interrupters: Use a pulse magnetic vacuum gauge to measure the internal gas pressure of the vacuum interrupter, record the measured value as P1 (Pa). After being left stationary for a period of time t (d), measure its internal gas pressure again with the same instrument and record the measured value as P2 (Pa). The stationary time t should not be less than 7 days. The allowable storage period T (years) is calculated by the following formula: T=((6.610ˉ²)/(P₂-P₁))(t/365) years.

The KGZK-I type vacuum switch vacuum degree tester is the latest generation product improved by our company based on user feedback on the basic model. It features higher testing precision, better stability, and higher intelligence.

The common method for determining whether the vacuum level of a vacuum tube has deteriorated is the power frequency withstand voltage method, which can only determine if the vacuum level has severely deteriorated. When the vacuum level deteriorates to between 10ˉ²~10ˉ¹ Pa, although the breakdown voltage has not decreased, the interrupter is already non-compliant. The vacuum switch vacuum degree tester uses a new type of excitation coil and applies magnetic control discharge method to test the vacuum degree of the interrupter without needing to dismantle it. Meanwhile, it employs a microcomputer for synchronous control and data acquisition processing, achieving a field testing sensitivity of the interrupter's vacuum degree up to 10ˉ⁵Pa. The most prominent feature of this instrument is the use of a new type of excitation coil and data processing methods, realizing non-dismantling measurement of vacuum degree. This instrument is convenient to use, simple to operate, does not require dismantling for measurement, and offers high testing accuracy, making it a practical detection tool widely applicable to departments using vacuum switches such as power, steel, petrochemicals, textiles, coal, railways, etc.

1. It can quantitatively measure the vacuum degree inside vacuum interrupters of various models of vacuum switches.
2. On-site measurement does not require dismantling the vacuum switch.
3. The test results are accurate and reliable.
4. Features a liquid crystal display with Chinese characters, making operation simpler and more convenient.
5. Can save, print, and view historical test data.
6. The instrument is equipped with an RS232 communication interface, allowing connection to a computer for control and operation of the instrument through the computer for various functions.
7. The instrument is lightweight and portable.

1. Testing Object: Various models of vacuum switch tubes.
2. Testing Method: Utilizes a new type of excitation coil for non-dismantling measurement of vacuum tubes.
3. Application Scope: This instrument is multi-functional and can measure multiple models of vacuum switches.
4. Testing Range: 10ˉ⁵—10ˉ¹ Pa.
5. Measurement Accuracy:
   • 10ˉ⁵—10ˉ⁴ Pa, 10%
   • 10ˉ⁴—10ˉ³ Pa, 10%
   • 10ˉ³—10ˉ² Pa, 10%
   • 10ˉ²—10ˉ¹ Pa, 10%
6. Magnetic Field Voltage: 1700V.
7. Pulse Electric Field High Voltage: 30KV.
8. Switch Tube Gap During Vacuum Measurement: Normal operating gap.
9. Operating Environment: -20℃~40℃.
10. Main Unit Weight: 24kg.
11. Dimensions: 410×320×370(mm).
12. Sampler: Magnetic control coil.