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AERIAL BUNCHED CABLES FOR OVERHEAD DISTRIBUTION

“BNSR” Aerial Bunched Cable ABC) is a very novel concept for Over Head power distribution. When compared to the conventional bare conductor over head distribution system, ABC provides higher safety and reliability, lower power losses and ultimate system economy by reducing installation, maintenance and operative cost. This system is ideals for rural distribution and specially attractive for installation in difficult terrains such as hilly areas, forest areas, coastal areas etc. ABC is also considered to be the best choice for power distribution in congested urban areas with narrow lanes and by- lanes. In developing urban complex, ABC is the better choice because of flexibility for rerouting as demanded by changed in urban development plan.

CONDTRUCTION OF ABC

XLPE/HDPE insulated power conductors of Aluminium (Neutral conductor and street lighting conductors if and when necessary) are laid together (twisted) around a high tensile stranded and galvanized steel (Aluminium alloy may be used) insulted messenger wire to form the Aerial Bunched Cable. This assembly is directly strung in to distribution pole/towers by means of standard hardware’s available in the market but care shall be taken to render the messenger wire completely insulated from earthing at and point of distribution in case of HTABC. The XLPE(Cross-linked Polyethylene) insulation is black in colour and is stabilized against deterioration caused by exposure to direct sunlight and ultraviolet radiation. XLPE is cross-linkable low density polyethylene which is made thermo set by special formulation from base polymer of thermoplastic low density polyethylene. XLPE combines the best electrical properties of LDPE and superior thermo mechanical properties.

MATERIALS

i. Aluminium conductors conform to IS:8130(Class-II)
ii. Stranded high tensile galvanized steel messenger wire conforms to IS: 398(Part-2).
Alternatively Aluminium alloy messenger wire conforms to IS: 398(Part-IV)
iii. XLPE and HDPE insulation of power conductors conform to IS: 7098(Part I @ II) and IS: 6474 respectively.

Since, the tension form the current carrying conductor is totally removed by introduction of messenger wire the operating temperature of the conductor is 900 C as against 750 C of the bate conductor under tension thereby allowing ABC to carry current equivalent to that of bate conductor of the same size.

STRINGING

No difficulty is envisaged during stringing of ABC in the conventional method but care shall be taken that insulated conductor do not get damaged during installation. Dragging the ABC on the ground is to be avoided. Tension to be applied during astringing shall be 25% of the breaking load of the messenger wires. This will allow line to have sag within specified limit of 1.5% of the span at the lowest ambient temperature.

JOINTING

While mid-span jointing permissible for LT ABC system by conventional technique, our recommendation will be to draw the line in such a way as to bring the joints at the supports. Mid-span jointing is not at all recommended in the case of HT lines, our recommendation is for outdoor type HV terminations only. Under unavoidable circumstances, line tapping at the support points may be allowed through suitably designed clamp connectors/PG clamps. The semiconducting screen continuity shall be maintained at all joints as far as possible to avoid fluctuations during system disturbances. The 3-phase screen may be shorted and earthed through suitable non-linear surge arrestor. Attempting to make a tap-off from power conductors in the region where catenary is under tension is not recommended.

APPLICATION

ABC can be conveniently used: a) As replacement of bare lines in Rural areas, in woods and in other localities& narrow Streets where the space is limited. b) As replacement of bate lines where reliability of supply is of prime importance. c) As replacement of bare lines where high degree of stability of supply voltage is of importance. d) In hilly terrains where cost of erection of overhead lines or under ground cable becomes very high. e) As reinforcement of existing system without increasing coltage. f) For temporary supplies.

ADVANTAGES

In comparison to bate overhead power distribution lines, ABC had high reliability in maintaining services because power and neutral conductors are insulated with the best dielectric medium , resulting in the following advantages:

1) Less fault rate on account of good protection against line and ground faults by high winds or falling trees or birds especially in hilly areas& forests as encountered in Rural distribution net-works.
2) High insulation resistance to earth in all seasons and polluted atmospheres. Negligible leakage currents and low losses.
3) Multiple circuits of Power and Telephone cables could be strung in the same set of poles or any other supports like walls etc.
4) Better adaptability to run concurrently with existing over-head bale conductor system without any interference.
5) High capacitance and low inductance leading to low impedance of lines
6) Lower voltage drop, higher current capacities. VIS-À-VIS Better Voltage Regulation.
7) Longer spans and longer distance lines are possible with better system stability.
8) ABC Cables are much safer than bate Conductors.
9) It can be over hung in dense vegetation and forests.
10) Additional connections can be easily and quickly made with hot line connection.
11) Total line costs are reduced.
12) Maintenance is very easy.

BNSR LT Arial Bunched Cables 1100 Volts (3 Core) Reference Standard Generally to IS: 7098(1)88.

3*25

+

1*16

+

1*35

3*35

+

1*16

+

1*35

3*50

+

1*25

+

1*35

3*70

+

1*35

+

1*55

3*95

+

1*50

+

1*55

000

+

1*16

+

1*70

3*120

+

1*16

+

1*70


BNSR LT Arial Bunched Cables 1100 Volts (4 Core) Reference Standard Generally to IS: 7098(1)88.

3*25

+

1*25

+

1*35

3*35

+

1*35

+

1*35

3*50

+

1*50

+

1*35

3*70

+

1*70

+

1*55

3*95

+

1*95

+

1*55


Details of the Power/Neutral core:

3*16

+

1*16

+

1*25

3*25

+

1*16

+

1*25

3*35

+

1*16

+

1*25

3*50

+

1*16

+

1*35

3*70

+

1*16

+

1*50

3*95

+

1*16

+

1*70

3*120

+

1*16

+

1*70


BNSR LT Arial Bunched Cables 1100 Volts (4 Core) Reference Standard Generally to IS: 6474-71.

3*16

+

1*25

3*35

+

1*25

3*35

+

1*25

3*50

+

1*35