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Description
Currently, the distribution system depends on the open-loop system in which the loop opening point between two distribution lines are operated around the clock. Under this open-loop system, blackouts are somewhat unavoidable if a fault on the distribution line occurs and as a result, the automation system works.
To address the problem, KDN has come up with Feeder-IED aligned for the distribution system, based on the closed-loop system and peer to peer high speed communication protection algorithm between F-IEDs, which can isolate the failure section in just five cycles, making the uninterruptible power supply.
Key Features
The F-IED provides three categories of major functions: the fundamental function, including the supervision, control and setup of circuit breaker; power quality monitoring function, including Harmonics analysis (THD, TDD, relative harmonic factor), analysis of Sag, Swell, Interruption, over/low voltage and imbalance, zero sequence, positive phase sequence, and negative phase sequence for analysis quality assessment, instantaneous waveform storage (128 Sample/Cycle, 20Cycle); fault detection & protection coordination function, including built-in POTT (Permissive Overreaching Transfer Trip) & Echo-POTT, DCB (Direction Comparison Blocking), DTT (Direct Transfer Trip), fault detection & protection of inner-fault at circuit breaker(Bus protection), breaker trip failure protection, 1:1 or 1:n high speed communication between F-IEDs.
In addition to these functions, the F-IEDs supports Non-grounding system protection and remote firmware upgrade.
F-IED supports following faults protections in the Closed-Loop System - feeder protection; communication failure protection; bus protection; lateral protection; breaker trip failure protection. In case of Feeder fault, F-IED can isolate fault sections within up to 84ms by using peer-to-peer communication.
Expected Benefits
This solution can automatically isolate the failure section via high-speed communication between F-IEDs without manipulation from the distribution control center. It also makes it possible to isolate the failure section without causing blackouts and can lead to the reliable power supply system even in the massive load-density areas.
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