I. Pabalat ng Proyekto at mga Mahahalagang Isyu na Sasabihin
Bilang isa sa pinaka-karaniwang ginagamit na mabababang-boltahan na electrical device, ang AC contactors ay naglalaro ng pangunahing papel sa mga sistemang may mahabang pag-operate. Gayunpaman, ang kanilang tradisyunal na disenyo ay may pundamental na kaputotan: ang mga kontak ay hindi maiiwasang lumikha ng ark kapag sinira ang circuit.
Ang inherent na kaputotan na ito ay nagdudulot ng serye ng malubhang problema:
II. Core Solution: Arc-Free Breaking Principle
Ang core innovation ng solusyon na ito ay nasa pag-adopt ng hybrid structure na binubuo ng main contacts + parallel thyristor module, kasama ang precise triggering control circuitry upang makapagtugma ng wasto sa kanilang switching sequences.
Operating Phase |
Time Node |
Action Process |
Core Objective and Effect |
Connection |
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10ms after coil energization |
Trigger circuit sends signal; three pairs of bidirectional thyristors instantly conduct. |
Make-first: Current path established first, preparing for contact closure → arc-free connection. |
|
15ms after coil energization |
Contactor main contacts close, short-circuiting the thyristors. |
Switchover: Mechanical contacts carry main circuit current; thyristors turn off automatically due to zero voltage difference → energy-efficient. |
|
Disconnection |
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After coil de-energization |
Contact pressure decreases; contact resistance increases; voltage drop across contacts rises to ~0.10V. |
Preparation: Voltage drop signal triggers control circuit → thyristors conduct immediately. |
|
12ms after coil de-energization |
Main contacts begin to open. |
Arc-free breaking: Current fully transferred to thyristor path → contacts break at zero current → completely arc-free. |
|
18ms after coil de-energization |
Trigger circuit stops signal; thyristors turn off naturally at current zero-crossing. |
Break-last: Completes arc-free breaking of the entire circuit. |
III. Pagpapatupad ng Proseso at Plano ng Pagbabago
Ang solusyon na ito ay sumusunod sa prinsipyong "targeted modification based on mature products," na siyang nagbibigay ng significant reduction sa mga industriyal na barriers at cost.
Specific Modifications:
IV. Test Conclusions and Significant Value
Ang AC contactor na itinayo batay sa solusyon na ito ay nakapagpasok na sa rigorous na mechanical at electrical endurance tests, na nagpapatunay ng kanyang seguridad, reliabilidad, at feasibility.
Core Value Delivered:
• Revolutionary Performance Improvement: Ganap na pag-iwas sa paglikha ng ark na nagdudulot ng tens of times na pagtaas ng electrical endurance, teoretikal na umabot sa antas ng mechanical lifespan. Bukod dito, ito ay nagbawas ng contact maintenance at nagtataas ng allowable operating frequency.
• Expanded Application Fields: Ang ark-free na katangian nito ay nagbibigay ng ligtas na aplikasyon sa high-risk environments na may mahigpit na explosion-proof at fire-proof requirements, tulad ng petrochemical plants, coal mines, aerospace, atbp., na nagbibigay nito ng highly reliable na core component sa mga control systems at power distribution systems.
• Eco-Friendly: Siyentipikong nagbabawas ng ark-induced na grid pollution at electromagnetic interference, na sumasabay sa development trend ng modern green electrical appliances.