All you should know about high voltage DC contactors
What is A HVDC Contactor
High Voltage DC Contactor is an electrical control device used in an automated control circuit. It is actually an “intelligent control switch” that uses a small current to control the operation of a large current. Therefore, it plays the role of automatic regulation, safety protection and conversion circuit in the circuit.
History of HVDC contactor
HVDC contactors, which began with projects such as the American space station and the “Comanche” helicopter project (initiated in 1983), have, after many years of development, acquired the following characteristics:
- Miniaturization
- Strong electrical switching performance
- Standardization and automation
- Intelligent integration
The Structure of A HVDC Contactor
What are the Core Processes for Manufacturing High-voltage DC Contactors?
Ceramic component brazing process:
We have mature ceramic vacuum brazing and Tunnel furnace brazing process. The core process and production cycle could be controlled by ourselves.
Gas-filled sealing process:
Achieving aviation-grade high vacuum levels, our product minimizes residual gas, ensuring unparalleled stability in electrical performance and an extended product lifespan.
Our products benefit from a high-purity blend of hydrogen and helium gases, ensuring optimal performance while accurately detecting even the minutest product micro-leakages.
Laser welding process:
The laser welding process has widely adopted the mainstream laser penetration welding technology, which, after extensive practical validation, ensures a mature, stable, and reliable process, providing excellent sealing performance for the product.”
Iron Core Spot Welding Process:
Utilizing the argon arc welding technique to firmly weld the iron core with the push rod, our spot welding process ensures reliable and stable weld points. This method guarantees the mechanical longevity and performance of the product.
How to Select Your HVDC Contactor
Selecting an HVDC (High Voltage Direct Current) contactor involves considering several factors to ensure the correct device is chosen for a specific application. Here are key steps to consider when selecting an HVDC contactor:
1. Operating Voltage:
Ensure that the rated operating voltage of the DC contactor meets the voltage requirements of the system.
2. Operating Current:
Select a DC contactor with sufficient carrying capacity according to the current load demand of the system.
3. Short-circuit Current:
Determine the expected short-circuit current of the system and select a DC contactor capable of withstanding this current.
4. Pre-charging Control:
Considering the system’s pre-charging resistance, pre-charging time and pre-charging current, choose a suitable DC contactor to realize a stable pre-charging process.
5. Turn-on life:
Determine the required turn-on life based on the voltage difference and current during turn-on, and select a DC contactor with the appropriate life.
6. Cut-off life:
Considering the abnormal conditions of the system and the need for cut-off with load, select a DC contactor with suitable cut-off life.
7. Mechanical environment:
According to the installation location and application environment of the DC contactor, select a contactor that can adapt to mechanical vibration and shock.
8. Temperature environment:
Consider the temperature environment in which the DC contactor is located and select a contactor that can operate properly in that environment.
9. Coil Control:
Consider factors such as the rated voltage of the coil drive power supply, the stability of the power supply, and the power supplied to match the coil control requirements of the DC contactor.
