FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
AND
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A phase segregated terminal box with online insulation monitoring system
assembly.
APPLICANT(S)
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR(S)
Wadbude Sahebrao and Pangal Sarvesh, both of Crompton Greaves Ltd., Machine (M7) Division, D-5 Industrial Area, MPAKVN, Mandideep - 462046, Madhya Pradesh, India; both Indian Nationals.
PREAMBLE TO THE DESCRIPTION:
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

FIELD OF THE INVENTION:
This invention relates to the field of motors.
Particularly, this invention relates to terminal boxes for motors
Specifically, this invention relates to a phase segregated terminal box with online insulation monitoring system assembly.
BACKGROUND OF THE INVENTION:
An electric motor is an electro-mechanical assembly that converts electrical energy into the mechanical energy. Most electric motors operate through the interaction of magnetic fields and current-carrying conductors to generate torque.
A variety of motors are available in the market. These include High Tension motors, Low Tension motors, and the like. The voltage / current demands and supply of the motor vary, too.
A motor, typically, has a driving side and a non driving side. Each side may be fitted with a terminal box such as a main terminal box and a star terminal box. These boxes occupy the operative front side and the operative back side of the motor.
A terminal box is an enclosure which includes, mounts, and protects one or more terminals or terminal boards. The main terminal box and star terminal box has three phase supply. For the purposes of this invention, typically, there is a phase segregated terminal box.

There is a termination arrangement for main supply cables to the motors through insulators.
Motors are a vital component for many large industries and industrial applications. It is essential to maintain the health of motors for effective and smooth running of associated equipment.
Frequently, motor failure can be associated with initiation of partial discharge (PD) which leads to complete breakdown in insulation. PD may occur due to ingression of moisture or presence of cavity.
The movement of electrical charges through an insulating (dielectric) medium, initiated by electron avalanches is called as electrical discharge. A partial discharge (PD) can be described as a localized electrical discharge that only partially bridges the insulation between conductors and which can or cannot occur adjacent to a conductor. These discharges might occur in any void between the conductor and the ground. The voids may be located between the conductor and insulation wall, or internal to the insulation itself, or between the outer insulation wall and the ground frame. Once begun, PD causes progressive deterioration of insulating materials, ultimately leading to electrical breakdown.
Since motors form important components in many networks or industrial equipment, failure of such motors requires the use of partial discharge sensors in order to sense partial discharge in the motors.
According to the prior art, phase insulated terminal boxes were used when such partial discharge measurements were to be done.

Phase segregated design is more safe for cable termination in HT motors. Hence provision for mounting online Partial Discharge measurement in such a construction is a better design.
However, there was no clamping assembly for the out-coming cable of the partial discharge sensor, preferably from the inline partial discharge sensor on the motor.
OBJECTS OF THE INVENTION:
An object of the invention is to provide a cable routing and clamping assembly for cables from inline partial discharge sensor mounted in a motor.
Another object of the invention is to provide a cable routing and clamping assembly, on a terminal box, for cables from inline partial discharge sensor mounted in a motor.
Yet another object of the invention is to provide a cable routing and clamping assembly, on a phase segregated terminal box, for cables from inline partial discharge sensor mounted in a motor.
SUMMARY OF THE INVENTION:
According to this invention, there is provided a phase segregated terminal box with online insulation monitoring system assembly, said assembly comprises:
a. an online partial discharge sensor, per phase, adapted to be mounted in a
cable dividing box placed along with said terminal box, with cable(s)
extending therethrough; and
b. clamping assembly, per phase, adapted to receive said cable(s), per phase,
respectively, through a laterally located hole on said clamping assembly.

According to this invention, there is also provided a motor with a phase segregated terminal box with online insulation monitoring system assembly, said assembly comprises:
A. an online partial discharge sensor, per phase, adapted to be mounted in a
cable dividing box placed along with said terminal box, with cable(s)
extending therethrough; and
B. clamping assembly, per phase, adapted to receive said cable(s), per phase,
respectively, through a laterally located hole on said clamping assembly.
Typically, said clamping assembly comprises: i. operative top left-hand-side rectangular block with facial slots for receiving
fastening elements and further comprising a first partial indentation on its
operative inner surface; ii. operative bottom left-hand-side rectangular block with facial slots for
receiving fastening elements; and iii. operative right-hand-side block with a second partial indentation on its
operative inner surface in a complementary manner to said first partial
indentation such that said first indentation and said second indentation when
face each other form a conduit to allow a cable to pass through as well as to
grip it from both sides, characterised in that,
said operative right-hand-side block comprising a through hole adapted to allow a cable from said online partial discharge sensor to pass through.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates a side view of a phase segregated terminal box; and

Figure 2 illustrates a front view of a phase segregated terminal box.
The invention will now be described in relation to the accompanying drawings, in which:
Figure 3 illustrates a three-dimensional view of a clamping assembly;
Figure 4 illustrates a side view of the clamping assembly of Figure 3;
Figure 5 illustrates a side view of a phase segregated terminal box with the clamping assembly of Figure 3; and
Figure 6 illustrates a front view of a phase segregated terminal box with the clamping assembly of Figure 3.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates a side view of a phase segregated terminal box.
Figure 2 illustrates a front view of a phase segregated terminal box.
A phase segregated terminal box is shown by reference numeral 4. Reference numeral 12 refers to a customer cable which is terminated at a customer cable termination socket (14) held by a cable gland (13). A machine cable (1) is also supported by cable glands (5) before it enters the customer cable termination socket (14). In the drawing of Figure 1 of the accompanying drawings, reference numeral 2 refers to a pressure relief disc, reference numeral 3 refers to a grommet, reference numeral 7 refers to a terminal box cover, reference numeral 8 refers to a

glass epoxy liner, reference numeral 9 refers to a terminal enclosure, reference numeral 10 refers to a desiccator, reference numeral 11 refers to a cable dividing box, reference numeral 13 refers to customer cable gland, , reference numeral 16 refers to a gasket, cap screw, reference numeral 18 refers to a hexagonal HD. screw, reference numeral 19 refers to a spring washer, reference numeral 20 refers to a cable dividing box cover, reference numeral 21 refers to a gasket, and reference numeral 22 refers to a gasket for pressure relied disc.
According to this invention, there is provided a phase segregated terminal box with online insulation monitoring system assembly.
Figure 3 illustrates a three-dimensional view of a clamping assembly;
Figure 4 illustrates a side view of the clamping assembly of Figure 3;
Figure 5 illustrates a side view of a phase segregated terminal box with the clamping assembly of Figure 3; and
Figure 6 illustrates a front view of a phase segregated terminal box with the clamping assembly of Figure 3.
In accordance with an embodiment of this invention, there is provided an online partial discharge sensor (IPDS) adapted to be mounted in the cable dividing box (11). Reference numeral 12 refers to a customer cable which is terminated at a customer cable termination socket (14) held by a cable clamp (100). Online PD measurement helps in predicting the quality of insulation and thereby accurately reveals the condition of the motor. This helps in early fault detection in the HT

motor. Motors that need such protection cannot be supplied with standard terminal boxes as they do not have provision for the mounting of theses sensors which monitor the partial discharge (PD).
In accordance with an embodiment of this invention, there is provided a clamping assembly (100). The clamping assembly comprises an operative top left-hand-side rectangular block (100a) with facial slots (52) for receiving fastening element and further comprises a first partial indentation (75a) on its operative inner surface. The clamping assembly further comprises an operative bottom left-hand-side rectangular block (100b) with facial slots (54) for receiving fastening elements. The clamping assembly still further comprises an operative right-hand-side block (100c) with a second partial indentation (75b) on its operative inner surface in a complementary manner to the first partial indentation such that the first indentation and the second indentation when face each other form a conduit to allow a cable to pass through as well as to grip it from both sides. Still further, the operative right-hand-side block comprises a through hole (85) adapted to allow a cable from the online partial discharge sensor (IPDS) to pass through.
A cable (24) from the IPDS is adapted to pass through the hole (85) on the clamping assembly of this invention.
This clamp is used on the terminal box (4) of the motor. This ensures that the AC motor is fitted with the phase segregated terminal box along with the provision to mount the sensors. This design ensures minimum distance from the power cable termination points which improves the accuracy of measurements and thereby makes motor more reliable.

Reference numeral 25 refers to separator plate on terminal box.
For each phase of the phase segregated terminal box, there is a clamping assembly and a cable from the IPDS, for each phase, passing through a hole provisioned on the clamping assemblies, respectively.
The technical advancement of this invention lies in provisioning a clamping assembly with a provision to receive a cable from an online partial detector sensor in a manner such that the clamping assembly is terminal box mounted. Hence, it provisions a design arrangement of the PST box with online insulation monitoring system for accurate measurements with minimal distance from power cable termination points.
While this detailed description has disclosed certain specific embodiments of the present invention for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We claim,
1. A phase segregated terminal box with online insulation monitoring system
assembly, said assembly comprising:
a. an online partial discharge sensor, per phase, adapted to he mounted in a
cable dividing box placed along with said terminal box, with cable(s)
extending therethrough; and
b. clamping assembly, per phase, adapted to receive said cable(s), per
phase, respectively, through a laterally located hole on said clamping
assembly.
2. An assembly as claimed in claim 1 wherein, said clamping assembly
comprising:
i. operative top left-hand-side rectangular block with facial slots for receiving fastening elements and further comprising a first partial indentation on its operative inner surface;
ii. operative bottom left-hand-side rectangular block with facial slots for
receiving fastening elements; and iii. operative right-hand-side block with a second partial indentation on its operative inner surface in a complementary manner to said first partial indentation such that said first indentation and said second indentation when face each other form a conduit to allow a cable to pass through as well as to grip it from both sides,
characterised in that,
said operative right-hand-side block comprising a through hole adapted to
allow a cable from said online partial discharge sensor to pass through.

3. A motor with a phase segregated terminal box with online insulation
monitoring system assembly, said assembly comprising:
A. an online partial discharge sensor, per phase, adapted to be mounted in a
cable dividing box placed along with said terminal box, with cable(s)
extending therethrough; and
B. clamping assembly, per phase, adapted to receive said cable(s), per
phase, respectively, through a laterally located hole on said clamping
assembly.
4. A motor as claimed in claim 3 wherein, said clamping assembly comprising:
i. operative top left-hand-side rectangular block with facial slots for
receiving fastening elements and further comprising a first partial
indentation on its operative inner surface; ii. operative bottom left-hand-side rectangular block with facial slots for
receiving fastening elements; and iii. operative right-hand-side block with a second partial indentation on its
operative inner surface in a complementary manner to said first partial
indentation such that said first indentation and said second indentation
when face each other form a conduit to allow a cable to pass through as
well as to grip it from both sides, characterised in that,
said operative right-hand-side block comprising a through hole adapted to allow a cable from said online partial discharge sensor to pass through.