In order to meet the requirements of high-tech industries for 20 ms power supply without interruption

it was proposed to adopt 3~5 ms opening fast circuit breaker in parallel with ultra-high-speed shutdown triggering gap within 1 ms to constitute a dual-power-supply uninterruptible switching scheme

and the key technology of AC 12 kV gas plasma jet triggering gap and the productization and development of the product was researched. Firstly

according to the application scenario of power supply uninterruptible switching device

the key technical requirements of trigger gap are clarified. For the needs of high-performance triggering

a single-stage micro-cavity plasma triggering method was proposed

a coaxial laminated productization triggering cavity was designed

a triggering characteristic test platform was built

and triggering performance test research was carried out. The results show that the gap can be triggered at a minimum voltage of 1.5 kV

with a trigger delay of 0.2 ms or less

and a no-load trigger life of 1 800 times at 4 kV. For the needs of large current flow and fast insulation recovery after arc

based on the principle of spinning arc of transversemagnetic electrode

the design of main electrode of spinning arc was completed

spinning arc simulation was carried out

and structural dimensions of main electrode were determined. The current test results show that the arc can rotate along the edge of the main electrode at a high speed

realizing 31.5 kA/10 ms/20 times (including two tests with the maximum DC component peak value of 80 kA) current

and can withstand the 12 kV circuit breaker short-circuit breaking restoration voltage for 100 ms after the arc is extinguished. Based on the solution of the above key issues

the design of AC 12 kV three-phase common air chamber type trigger gap structure has been completed. The prototype has been developed and verified by performance tests

and the key technical indexes of insulation

triggering and through-current fully meet the requirements of the use of dual-supply uninterruptible switching devices. The plasma jet gas triggering gap developed in this paper can be used as a general-purpose ultra-high-speed closing switch

and can also be used for mechanical DC circuit breakers to realize the rapid input of the transfer branch; meanwhile

the phase selector controller can achieve accurate selection of the relevant closure

the rapid control of AC and DC controllable lightning arrester

fast bypass protection and other applications that require ultra-high-speed closing or bypass and other application scenarios

which are of high value in terms of research and application.