Request for Amended Advice Agency Response_Energex_Council CDA_01-04-2020

        J&P Richardson Industries Pty Ltd      -8-


4.0     MAGNETIC AND ELECTRIC FIELD CALCULATIONS


4.1     General Parameters

4.1.1   Load current
        The average load currents to be used in all studies are 63A and 61A per phase for F790
        and F7298 respectively (refer Table 2 S2.3.1) with both circuits energised.

        The 10PoE loads for F790 and F7298 through to 2023/2024 in the most recent ENERGEX
        132/132kV feeder forecast are 78A and 77A respectively.

4.1.2   Phasing
        The phasing configuration on the double circuit line is as shown in Figure 4 S4.2.3. The
        configuration is known as diagonal phasing and is the arrangement adopted to produce
        minimum magnetic field level.

4.1.3   Height of field calculation
        Height of field calculation above ground = 1m.


4.2     Average conductor height and geometry

        A temperature of 50°C will be used as the reference for average phase conductor height
        calculations.

4.2.1   F790/7298
        Phase conductor           :    SATURN (design temperature 80°C)
        OHEW                      :    1x18.2mm “Cossonay” OHEW
        Average span              :    207.5m
        Stringing tension         :    18.2% UTS (phase), 8.8% (OHEW)
        Minimum clearance         :    6.7m

        Calculate average conductor height = (RL1+RL2)/2 – 2/3 *sag

        Table 5A       Average height lower phase conductor F790 / 7298

            FROM                       TO                                           AVERAGE
                         RL(m)                  RL(m)    SPAN(m)     SAG@50°C
            POLE                      POLE                                           HAG (m)
           303669         13.79       303670    17.90       223           7.0         11.12
           303670         17.90       303671    13.79       192           5.2         12.38

        Table 5B       Average height OHEW F790 / 7298

            FROM                       TO                                           AVERAGE
                         RL(m)                  RL(m)    SPAN(m)     SAG@25°C
            POLE                      POLE                                           HAG (m)
           303669         19.59       303670    23.70       223          5.71         17.84
           303670         23.70       303671    19.59       192          4.23         18.82

        NB : HAG = Height above ground




        Hollett Road EMF Study                                                       V1.0