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Q18-At a particular grid station, it was seen that impedance protection scheme was employed for protecting transmission lines against faults. But this scheme does not

Q18-At a particular grid station, it was seen that impedance protection scheme was employed for protecting transmission lines against faults. But this scheme does not provide instantaneous protection for complete length of a long line. Elaborate the main hindrances in applying this scheme. How these hindrances are dealt in practice?

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