Product Introduction

       According to JB8738—1998 "Vacuum Interrupters for 3.6—40.5KV AC High-Voltage Switches" formulated by the "National High-Voltage Switchgear Standardization Technical Committee," "Internal Gas Pressure Measurement and Permissible Storage Period Inspection" is a mandatory test item for units producing and using vacuum interrupters in high-voltage switchgear. It stipulates that the permissible storage period for interrupters is 20 years. The internal gas pressure of the vacuum interrupter should be lower than 6.6×10?2 Pa.

       Vacuum interrupter permissible storage period inspection method: Use a pulsed magnetic vacuum degree tester to measure the internal gas pressure of the vacuum interrupter and record the measured value P1 (Pa). After letting it stand for a period of time t (d), use the same instrument to measure its internal gas pressure again and record the measured value P2 (Pa). The standing time t should not be less than 7 days. Calculate the permissible storage period T (years) using the following formula: T = (6.6×10?2) / (P2 - P1) × t / 365 (years).

       NDZK-Ⅳ Vacuum Switch Vacuum Degree Tester is a new-generation product developed by our company based on user feedback from the NDZK-Ⅲ model. It features higher testing accuracy, better stability, and a higher level of intelligence.

Product Features

       The common method for determining whether the vacuum degree of a vacuum tube has deteriorated is the power frequency withstand voltage method. However, this method can only identify interrupters with severely deteriorated vacuum degrees. When the vacuum degree deteriorates to 10?2–10?1 Pa, although the breakdown voltage does not decrease, the interrupter is already unqualified. The NDZK-IV Vacuum Switch Vacuum Degree Tester uses a new excitation coil and applies the magnetron discharge method to test the vacuum degree of the interrupter without disassembling it. Simultaneously, it employs a microcomputer for synchronous control and data acquisition processing, achieving an on-site testing sensitivity of 10?? Pa for interrupter vacuum degrees.

       The standout feature of this instrument is its use of a new excitation coil and data processing method, enabling non-disassembly measurement of vacuum degrees. It offers the advantages of ease of use, simple operation, non-disassembly measurement, and high testing accuracy. It is a practical testing instrument widely applicable to sectors using vacuum switches, such as power, steel, petrochemical, textile, coal, and railway industries.

Technical Parameters

☆ Test Object: Various models of vacuum switch tubes.

☆ Testing Method: Uses a new excitation coil for non-disassembly measurement of vacuum tubes.

☆ Applicable Range: This instrument is a multi-purpose device capable of testing various models of vacuum switches.

☆ Testing Range: 10??–10?1 Pa 

☆ Measurement Accuracy: 10??–10?? Pa,   15% 

      10??–10?3 Pa,   15%

      10?3–10?2 Pa,   10%

      10?2–10?1 Pa,   10%

☆ Magnetic Field Voltage: 1700V

☆ Pulsed Electric Field High Voltage: 30KV

☆ Switch Tube Gap During Vacuum Degree Testing: Normal operating gap.

☆ Operating Environment: -20℃ to 40℃

☆ Main Unit Weight: 12kg

☆ Dimensions: 420×320×280(mm)

☆ Sampler: Magnetron coil