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الموضوع: Weak infeed

  1. #1
    Junior Engineer
    تاريخ التسجيل
    Jan 2019
    الدولة
    العراق
    المشاركات
    56

    Weak infeed

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  2. #2
    Junior Engineer الصورة الرمزية elhusinyelhabyan
    تاريخ التسجيل
    Oct 2008
    الدولة
    egypt
    المشاركات
    276

    رد: Weak infeed

    Weak infeed or weak source scenario occurs only under fault condition. But this system
    configuration may exist under condition of normal system operations or some kind of
    outage operations. Generally there are two kinds of weak infeed scenario, conditionally
    and unconditionally, depend on system configuration and types of power sources.
    The truth of weak infeed is fault impedance, the sum of source impedance and short
    circuit impedance, is higher and power sources can’t provide reliable fault current for
    relay current related elements detecting the fault. An interesting issue is fault impedance
    is a variable function of system operation, and especially fault location within the
    protection zone. Under a given system condition fault impedance is nonlinearly
    proportional to fault location. For close in fault it is the minimum and for remote end
    fault it is the maximum.

    Conditional weak infeed occurs in complex system configuration and is dependent on
    fault location. Protection for conditional weak infeed is included in line protection
    schemes that apply manufacturer’s typical logics generally.
    Unconditional weak infeed occurs mainly with IPP (Independent Power Producers)
    connection to the system. For the innate features of IPP sources, its equivalent source
    impedances may limit to provide fault current to some extent for external faults in grid.
    Protection for unconditional weak infeed is not included in line’s protection schemes

    generally, but practiced as a way of interconnection protection. The protection should
    include two parts, the main protection from utilities line’s ends, and independent IPP
    local backup protection.

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