FIELD OF INVENTION
The invention relates to a device for pole-to-pole connection of field winding for Hydro-
Generators, in particular adaptable to Rotor assembly of Hydro-Generators at site.
BACKGROUND OF THE INVENTION
Hydro projects being located at far flung remote areas having poor rail/road access
imposes greater limitation on transportation, hence Hydro-Generators having large size
components can not be transported to site in completely assembled condition. Due to
above restrictions & to facilitate transportation, various components/sub-assemblies of
Hydro-Generators are supplied loose to various Hydro projects.
The wound poles are assembled on rotor rim and interconnections between the various
wound poles are done at site to form complete field winding of Hydro-Generators.
A further practical problem was observed that the existing method requires drilling of
hole in the field coil leads and the process is complicated specially for bottom to bottom
field coil connections. This essentially require trained workman which is generally not
available at site and may results in poor quality of the pole to pole joint of field winding
which associates with the problems of rotor earth fault and excessive heating of joints
during operation. Further, the field coil leads gets spoiled during subsequent
dismantling & Reassemble as & when required during maintenance in future.

This necessitates to develop a novel device for pole to pole connection for field winding
to eliminate the drawbacks of existing method
OBJECTS OF THE INVENTION
It is therefore, an object of the present invention to propose a device for pole to pole
connection of field winding for Hydro-Generators which eliminates the disadvantages of
prior Art.
Another object of the present invention is to propose a device for pole to pole
connection of field winding for Hydro-Generators which is more efficient, reliable and
eliminates problem of excessive heating of joints and rotor earth fault during operation
of Hydro-Generators.
A further objects of the present invention is to propose a device for pole to pole
connection of field winding for Hydro-Generators which facilitates to perform
maintenance work.
A still further object of the present invention is to propose a device for pole to pole
connection of field winding for Hydro-Generators which totally eliminates drilling of
holes and spoiling of field coil leads.
An yet further object of the present invention is to propose a device for of pole to pole connection of field winding for Hydro-Generators which is eco-friendly.

SUMMARY OF THE INVENTION
Accordingly, a novel device for improved pole to pole connection of field winding for
Hydro-Generators has been invented.In this newly developed device, after mounting
of wound poles on rim, the field coil connecting leads of adjacent poles are interleaved
& soldered. The joint is thus insulated and clamed using one set of insulation washer
(2nos.in 'C' shape-see attached figure 3) placed perpendicular to the connecting leads
and 2 sets of nuts and bolts (see figure 4).
Thus drilling of hole in field coil connecting leads has been totally eliminated to maintain
healthiness of field coil leads for subsequent dismantling & reassembly process as &
when required during maintenance in future. This improved pole to pole connection
eliminates the problem of rotor earth fault and excessive heating of pole to pole field
coil joints. Thus, it improves the performance during operation of Hydro-Generators.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING:
FIGURE-1: Existing design for clamping of pole to pole connections of field winding
for Hydro-Generators (Prior Art).
FIGURE-2: Insulation washer under in existing design for clamping pole to pole
connections of field winding for Hydro-Generators (Prior Art).
FIGURE-3: New Insulation washer developed for novel device for pole to pole
connection of field winding for Hydro-Generators.
FIGURE-4: New design invented for clamping of pole to pole connections of field
winding for Hydro-Generators.

BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE
INVENTION
As shown in figure 3, the device comprising a rectangular member (1) provided
With two holes (2,3) on longitudinal side having equidistance from the center of the
member (1) for inserting fastenable means. The other face of the rectangular
member(l) is provided with a recess (4) spread over equidistant from the centre of the
member (1). For assembling purpose, one rectangular member (1) inversely place on
the other and fastened by a fastening
means to make a compact unit.

WE CLAIM
1. A device for pole to pole connections of field winding adaptable to rotor
assembly for hydrogenerators comprising and characterized in that;
- at least two rectangular shaped member (1) are assembled by
one inversely place on the other and are fastened by a fastening
means;
- each rectangular member is provided with two holes (2,3) on
longitudinal side and equidistance from the center of the member
(1) for inserting a fastening means;
- each rectangular member (1) is provided with a recess (4) spread
over equidistance from the center of the member (1);
- assembled two members (1,1) holds the pole to pole connection
of field winding in between their recess (4, 4) space and
- each hole of the member (1) clamps the terminal lead of field
winding by fastening means.
2. The device as claimed in claim 1, wherein the rectangular member (1) is
made of insulating material.
3. The device as claimed in claim 1, wherein the rectangular member (1) is to be fastened by bolts & nuts.

ABSTRACT

A DEVICE OF POLE TO POLE CONNECTIONS OF FIELD WINDING
ADAPTABLE TO ROTOR ASSEMBLY FOR HYDROGENERATORS
A device for pole to pole connections of field winding adaptable to rotor
assembly for hydrogenerators comprises of at least two reactangular shaped
member (1) which are assembled by one inversely placed on the other and
fastened by fastening means. Each rectangular member (1) is provided with two
holes (2, 3) on longitudinal side and is equidistance from the center of the
member (1) for inserting a fastening means. Each rectangular member is also
provided with a recess (4) spread over equidistance from the center of the
member (1) . The assembled two members (1, 1) hold the pole to pole
connection of field winding in between their recess (4, 4) space and each hole of
the member (1) clamps the terminal lead of the field winding by fastening
means.