F O R M 2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10; rule 13)
1.Title of the invention: A SYSTEM, A DEVICE AND A METHOD FOR ENHANCED & FAST ADJUSTMENT OF ELECTRICAL LOAD IN ELECTRICAL TESTING OF SWITCHGEARS
2. Applicant(s):
(a) NAME : LARSEN & TOUBRO LIMITED
(b) NATIONALITY : An Indian Company
(c) ADDRESS : L & T House, Ballard Estate, Mumbai
400 001,State of Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
The present invention relates generally to the adjustment of electrical load. More particularly, it gives the enhanced, effortless & time saving system, device and method of adjustment of mixed electrical load (combination of impedance (Z) & resistance (R)) & power factor.
BACKGROUND OF THE INVENTION
In switchgear Testing electrical load is the combination of the variable impedance (7) & resistance (8) because variable power factor & current is the requirement of IS/IEC, Figure. 1(A) shows the general diagram of Electrical load & figure 1(B) shows the circuit diagram of electrical load.
Now the adjustment of load is quite a cumbersome method, it takes lot of time & then also we are not sure if the adjusted value is correct or not. For the adjustment of the impedance(7) every time one has to change the taps(Z1-Z14), tighten the nut-bolts & in case of adjustment of resistance(8) one has to make the series & parallel combination of resistances by using shorting link (6) & then the value has to be checked every time by the measurement system, which is a time consuming process.
Let's take an example- If we have an electrical load as shown in figure 1 (B) with the total value of Z (Z1 to Z14) is 0.1 to 5 Ω & value of R (R1 to R7) is 0.2 .Now if we want to adjust the load for 100 A, 415 V & 0.35 power factor (pf). Firstly we have to calculate the value of
Impedance(Z=V/√3I) & (1)
Resistance(R=pf * Z) (2)
By using above formulae the value of Z =2.3988 Ω & R= 0.839 Ω Now, to adjust the values of Z & R in Fig 1,

Suppose we get the desired value of Z (2.3988 Ω) at tap 2 (Z2) & 10 (Z10), then
we have to take the wire (5) & connect them between star point (1) to tap 2 (Z2)
& tap 10 (Z10) to end point (2) as shown in fig 2(A & B).
And to get the above value of R (0.839 Ω) one should connect the 4 resistances in
series as shown in fig 2 (A & B)
Note: The electrical path is shown by the red colour in fig 2 (A & B).
(Sequence of current flowing -
Impedance start(1) - Z2 - Z10 - Impedance end (2) - Resistance start (3)- R1 - R2 -
R3 - R4 - Resistance end (4) )
Hence this is a long & time consuming process which involves again & again
tightening of nut-bolts & checking of current values which is a tedious job.
Thus, there is a need to overcome the problems of the prior art.
Figure 2 shows the present method.
OBJECTS OF THE INVENTION
One object of the invention is to overcome the disadvantages/drawbacks of the prior art.
A basic object of the present invention is to provide a system for enhanced & fast adjustment of electrical load in electrical testing of switchgears.
Another object of the present invention is to provide faster method of load adjustment.
Another object of the present invention is to save copper and contribute towards green earth.
These and other advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.

SUMMARY OF THE INVENTION
An aspect of the present invention is to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below.
In an aspect of the present invention, there is provided a system for adjustment of
electrical load in electrical testing of switchgear(s), the system comprising:
an impendence adjusting arrangement comprising one or more impedance taps , a
shorting bus bar and a mechanical lock; wherein the shorting bus bar with a
mechanical lock connected to the impedance taps for adjusting the impedance
value in the switchgear; and
a resistance adjusting arrangement comprises at least a resistance, a slider and a
runner; wherein the slider moving over the resistor using the runner for facilitating
resistance adjustment in the switchgear.
Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The following drawings are illustrative of particular examples for enabling
methods of the present invention, are descriptive of some of the methods, and are
not intended to limit the scope of the invention. The drawings are not to scale
(unless so stated) and are intended for use in conjunction with the explanations in
the following detailed description.
Fig. 1A shows the present set up.
Fig. 1B shows the electrical connection of existing set up.

Fig. 2A shows the present set up with wiring and shorting links.
Fig. 2B shows the electrical path.
Fig. 3A shows modified set up of the present invention.
Fig. 3B shows the electrical connection of the modified set up of the present
invention.
Fig. 4A shows the modified set up with shorting bus bar, mechanical lock &
slider with runner.
Fig. 4B shows the electrical path.
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure.
Throughout the drawings, it should be noted that like reference numerals are used to depict the same or similar elements, features and structures.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.
By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.
Accordingly in the present invention provides a system of electrical load adjustment.
As discussed earlier the existing method of electrical load adjustment is cumbersome & a tedious method.
So, in this modified method, a impedance (21) is there, which consists a shorting bus(20) bar which is moved over the circular taps (16) & placed at the point where one will get the calculated value of Z (according to the formulae 1).
Then the value of resistance is calculated (according to the formulae 2) & the slider (13) is moved over the resistor (22) accordingly to get the calculated value.

The figure 3 & 4 illustrates the detailed picture of enhanced method of load adjustment.
As fig shows the enhanced system of load adjustment which consists of impedance tap (Z1-Z14) & resistance (R22). In impedance tap (16) which is circular in shape , is provided with the shorting bus bar (20), with mechanical lock (18,19) which will provide the mechanical pressure so that when the current is passed through it & forces are high, then that bus bar will maintain the pressure over the coil & will remain in contact with it.
In fig., the slider (13) can be moved over the resistors (22) with the help of runner (14) to get the desired value of resistance.
The present invention provides an easier adjustment of impedance, the impedance bank(21) can be arranged, as shown in fig 3 & 4 (A & B), which consists of taps (16) with circular arrangement & the shorting bus bar (20) which is used for shorting between impedance start(9) to taps(16) and taps(16) to impedance end(10). (When the current is passed through the inductive bank the force will be quite high, so it is necessary to provide mechanical lock (18,19) which provides opposite force on bus bar(20), so that the bus bar(20) will remain in contact with the taps. For that many types of mechanical lock are available in market like half circle lock, rotating wheel lock, spring force lock & pneumatic lock). Whenever we need to adjust the value of impedance we can just put the bus bar (20) at the respective taps (16) (between Z1 to Z14) , for this no extra effort is required.
Similarly, for the easier adjustment of resistance(22), we can use only one resistance of high wattage (8) & variable resistance adjustment as shown in fig 3 & 4. There will be sliding contact (13) over the resistance. Then that slider(13) can be moved over the resistance coil with the help of runner (14) .
The new system claims the faster adjustment of impedance.

ADVANTAGES:
1. Time saving method
2. Effortless method
3. Saves conductive material
4. Saves resistive material

WE CLAIM:
1. A system for adjustment of electrical load in electrical testing of
switchgear(s), the system comprising:
an impendence adjusting arrangement comprising one or more impedance taps , a shorting bus bar and a mechanical lock; wherein the shorting bus bar with a mechanical lock connected to the impedance taps for adjusting the impedance value in the switchgear; and
a resistance adjusting arrangement comprises at least a resistance, a slider and a runner; wherein the slider moving over the resistor using the runner for facilitating resistance adjustment in the switchgear.
2. The system as claimed in claim 1, wherein the impedance tap(s) arranged in a circular arrangement.
3. The system as claimed in claim 1, wherein the shorting bus bar providing shorting between an impedance start to the impendence tap(s) and impendence tap(s) to an impedance end.
4. The system as claimed in claim 1, wherein the mechanical lock provided with the shorting bus bar facilitating locking of the short bus bar with the impendence tap(s), when current passed through a load bank of the switchgear(s).
5. The system as claimed in claim 1, wherein the mechanical lock is selected form the group comprising a half circle lock, a rotating wheel lock, a spring force lock, a pneumatic lock and the like.