Switch Vacuum Tester
Introduction
Switch Vacuum Tester is a specialized instrument used to detect the vacuum degree in the arc extinguishing chamber of high-voltage switchgear (especially vacuum switches). By measuring the vacuum degree inside the arc extinguishing chamber, the insulation performance and reliability of the vacuum switch can be evaluated. This is crucial for the stable operation of the power system.
Testing Principle
The Switch Vacuum Tester uses the magnetic control discharge method for measurement. The specific steps are as follows:
Open the contacts: Separate the two contacts of the vacuum switch's arc extinguishing chamber by a certain distance.
Apply high voltage: Apply a pulsed high voltage electric field.
Generate magnetic field: Place the arc extinguishing chamber inside or outside the solenoid coil and pass a large current to generate a pulsed magnetic field synchronized with the high voltage.
Ion current: Under the action of the pulsed strong magnetic field and strong electric field, charged particles in the arc extinguishing chamber move in a spiral motion and collide with residual gas molecules to cause ionization. The resulting ion current is approximately proportional to the residual gas density, i.e., the vacuum degree.
Calculate vacuum degree: By measuring the ion current and combining with specific vacuum tube parameters, the vacuum degree value is calculated.
Equipment Features
Portability: Compact structure, small size, light weight, easy to carry.
Fast measurement: Short test time, generally completed within a few minutes.
High precision: Reliable measurement results with good repeatability.
Non-destructive: No need to disassemble the vacuum switch; can be tested directly on site.
Versatility: Supports testing of multiple types of vacuum tubes.
Operating Steps
Power-off preparation: Power off both ends of the vacuum tube under test to ensure it is in a normal open state.
Function selection: After wiring, turn on the instrument's power switch and select the desired function via the buttons.
Set tube type: Set the corresponding parameters according to the type of vacuum tube under test.
Vacuum measurement: Start the measurement process; the instrument will automatically calculate and display the vacuum degree value.
Data processing: You can choose to save the data or print the results.
Precautions
Safety first: Ensure all safety regulations are followed during the testing process.
Correct connections: Ensure all connections are correct and secure.
Environmental factors: Pay attention to environmental conditions during testing, such as temperature and humidity, as these factors may affect the test results.
Application Scenarios
New installations: Acceptance testing of newly installed vacuum switchgear.
Routine maintenance: Regular maintenance checks on vacuum switches in operation.
Fault diagnosis: Used for fault diagnosis and localization when failures occur.
Equipment refurbishment: Performance evaluation when refurbishing old equipment.
Conclusion
The Switch Vacuum Tester is one of the indispensable tools in power system maintenance. It helps technicians quickly and accurately assess the vacuum degree of vacuum switches, thereby ensuring the safe and stable operation of the power system.
The above content summarizes the basic information, testing principle, equipment features, operating steps, precautions, and application scenarios of the Switch Vacuum Tester. In actual operation, please follow the specific user manual or technical documentation for detailed usage guidelines and technical parameters.
