Trouble Shooting with EFL 10 Which one is

Trouble Shooting with EFL 10 Which one is the Proper Fault Location Method ? Typical Cable Problems Insulation Faults Flooded cable R b ≠ R a C b ≠ C a Recommended Fault Location Method ▼ ▼ To learn more click on the selected method! ELEKTR NIKA ▼

Murray Method Recommended when only one wire of the tested pair is faulty. The result of Murray measurement is: Lx/L In addition EFL 10 provides: ■ RL loop resistance ■ Fa. E insulation resistance ■ Rx resistance to fault ■ Lx distance to fault The conditions of accurate results: ■ Ia and Ib < 450 u. A ■ Ф wire a=Ф wire b ■ Fb. E>1000 x Fa. E ■ Fb. E>10 MOhm ELEKTR NIKA

Küpfmüller Method Recommended when both wires of the tested pair are faulty. The Küpfmüller method consists of 2 measurements: ■ First measurement with open far end ■ Second measurement with strap on the far end The result of Küpfmüller measurement is: Lx/L In addition ECFL 30 provides: ■ RL loop resistance ■ Fa. E and Fb. E insulation resistances ■ Rx resistance to fault ■ Lx distance to fault The conditions of accurate results: ■ Ia and Ib < 450 u. A ■ Ф wire a=Ф wire b ■ 0, 5>Fa. E / Fb. E>2 ■ Fa. E + Fb. E>100 x R loop ELEKTR NIKA

3 -Point Method Recommended when the gauge of wires in a pair are different (two healthy auxiliary wires are necessary) The 3 -Point method consists of 3 measurements: ■ First measurement when the measuring voltage is connected to wire a ■ Second measurement when the measuring voltage is connected to the ground ■ Third measurement when the measuring voltage is connected to wire c The result of 3 Point measurement is: Lx/L In addition EFL 10 provides: ■ RL loop resistance ■ Fa. E insulation resistance ■ Rx resistance to fault ■ Lx distance to fault The conditions of accurate results: ■ Ia and Ib < 450 u. A ■ The insulation resistance of auxiliary wires must be thousand time as high than that of the faulty one. ELEKTR NIKA

Resistance Difference Measurement EFL 10 provides the following results: Ra, Rb, Rloop, Δ R, % ELEKTR NIKA

Capacitance Unbalance Measurement EFL 10 provides the following results: Ca. E, Cb. E, ΔC n. F, Δ % ELEKTR NIKA

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