1. A method of forming a high-voltage cable joint, the method comprising
steps of:
forming a lap joint of two cables;
wrapping a wire conductor (3) over the lap joint;
soldering the wrapped joint;
placing the soldered joint in a cavity (7) and a groove (9) of a tool;
securing a top plate (11) of the tool over a bottom plate (10) of the tool;
pouring an epoxy encapsulant (1) in a space formed between a cavity (7) of the tool and a cutout (8) of the tool;
placing the tool in a vacuum chamber for de-airing; and
curing and extracting the cured high-voltage cable joint from the tool outside the vacuum chamber.
2. The method as claimed in claim 1, wherein the two cables have central conductors (5a and 5b) of unequal diameters.
3. The method as claimed in claim 1, wherein the two cables have central conductors (5a and 5b) of equal diameter.
4. The method as claimed in claim 1, wherein a plurality of high-voltage cable joints are formed simultaneously in the tool.
5. The method as claimed in claim 1, wherein the high-voltage cable joint has dimensions of 35 mm [Length], 8.5 mm [Width], and 10 mm [Height].

6. The method as claimed in claim 1, wherein the high-voltage cable joint is adapted to withstand a voltage of 12 KV up to an altitude of 30,000 feet above mean sea level at -40°C and at ambient temperature.
7. A tool for manufacturing a high-voltage cable joint, the tool comprising:
a top plate (300) having:
at least one center guide marking (302) for aligning a lap joint at center of the top plate (300);
at least one cutout (304) for holding the lap joint therein; and
a plate (306); and a bottom plate (400) having:
at least one groove (402) for holding the lap joint therein;
at least one cavity (404); and
a plate (406) fastened to the plate (306).
8. The tool as claimed in claim 7, wherein an epoxy encapsulant is poured in a space formed between the cavity (404) and the cutout (304).
9. The tool as claimed in claim 7, wherein the tool is placed in a vacuum chamber for de-airing.
10. The tool as claimed in claim 7, wherein the tool is used for manufacturing a plurality of high-voltage cable joints simultaneously.
11. A high-voltage cable joint, comprising:
two central conductors (5a and 5b) of two cables overlapped at a predetermined distance to form a lap joint;
a wire conductor (3) wrapped over the lap joint, said wire conductor (3) soldered (2) to obtain a smooth soldered surface; and

an epoxy encapsulant (1) that encapsulates the soldered surface, said epoxy encapsulant (1) spread evenly over the soldered surface, wherein de-airing is done in a vacuum chamber and the high-voltage cable joint is cured in a tool.
12. The high-voltage cable joint as claimed in claim 11, wherein the two central conductors (5a and 5b) have unequal diameters.
13. The high-voltage cable joint as claimed in claim 11, wherein the two central conductors (5a and 5b) have equal diameter.
14. The high-voltage cable joint as claimed in claim 11, wherein the high-voltage cable joint has dimensions of 35 mm [Length], 8.5 mm [Width], and 10 mm [Height].
15. The high-voltage cable joint as claimed in claim 11, wherein the high-voltage cable joint is adapted to withstand a voltage of 12 KV up to an altitude of 30,000 feet above mean sea level at -40°C and at ambient temperature.