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A circuit breaker is a device engineered to interrupt fault currents and sometimes reclose automatically. When a fault current is detected, the breaker separates the electrical contacts, which generates an arc. This arc is extinguished by methods such as elongation, cooling, or splitting, depending on the breaker's design. Breakers are categorized based on the voltage they operate at and the medium used for arc extinction, such as air, oil, SF6 gas, or vacuum.
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Improved assembly DC circuit breaker based on resonant current injection.

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A novel multiport assembly circuit breaker based on current injection (CI-MPACB) effectively clears DC fault lines. This innovative design uses resonant current injection to rapidly extinguish arcs, enhancing DC network safety and reducing costs.

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Area of Science:

  • Electrical Engineering
  • Power Systems
  • Circuit Protection

Background:

  • High-capacity, low-cost DC circuit breakers (DCCBs) are crucial for DC network fault clearance.
  • Assembly DC circuit breakers (ADCCBs) offer cost reduction but face challenges with prolonged high voltage during faults.
  • Existing designs require improvement to address voltage stress and ensure reliable fault interruption.

Purpose of the Study:

  • To propose a multiport assembly circuit breaker based on current injection (CI-MPACB) for efficient DC fault interruption.
  • To overcome the limitations of conventional ADCCBs regarding voltage stress and fault clearance time.
  • To reduce the cost of DC circuit breakers through an innovative current injection design.

Main Methods:

  • A multiport assembly circuit breaker based on current injection (CI-MPACB) is developed.
  • Resonant current with increasing amplitude is generated by controlling Integrated Gate-Commutated Thyristors (IGCTs).
  • Complex frequency domain circuit analysis is performed on the main breaking section (MBS) for design and validation.

Main Results:

  • The CI-MPACB successfully generates resonant current for arc extinction in the sub-breaking section (SBS).
  • Frequency domain analysis and parameter design ensure quick and reliable fault current cutoff.
  • PSCAD/EMTDC simulations and test results confirm the opening viability and effectiveness of the CI-MPACB.

Conclusions:

  • The proposed CI-MPACB effectively clears DC fault lines, enhancing safety and reliability.
  • The resonant current injection method significantly reduces arc duration and voltage stress.
  • This design offers a cost-effective solution for high-capacity DC circuit breakers.