The present disclosure relates to the field of switchgear. More
particularly the present disclosure relates to a natural ventilated bushing for the switchgear.
BACKGROUND
[0002] Background description includes information that may be useful in
understanding the present invention. It is not an admission that any of the
information provided herein is prior art or relevant to the presently claimed
invention, or that any publication specifically or implicitly referenced is prior art.
[0003] Conventionally, in switchgears power conductors or links have to
pass through Metallic earthed partitions while crossing from cable to circuit breaker and circuit breaker to busbar compartment, which need to be properly isolated or insulated from earthed metallic sheet and also maintain required ingress protection level. So, a multilayered electrically insulated component containing conductor at the center known as bushing or primary disconnector bushing is generally used in order to pass the link from one compartment to other through earthed metallic partition.
[0004] Conventional design of bushing consists of conductor which is
encapsulated or surrounded by electrically insulated or non-metallic material from all sides. Conductor is carrying the rated current and removable finger contact of Circuit breaker engages on CB side of Bushing. This removable/moving finger engagement has contact resistance value more than bolted contacts. Flow of rated current through removable joint and poor ventilation around conductor due to electrical insulation, increases the temperature of joint and conductor due to more ohmic loss and poor convection around bushing conductor.
[0005] There is, therefore, a need of an improved design for the bushings
for the switchgear which can have an improved ventilation system for heat generated during the operation of the bushing.

OBJECTS OF THE PRESENT DISCLOSURE
[0006] Some of the objects of the present disclosure, which at least one
embodiment herein satisfies are as listed herein below.
[0007] It is an object of the present disclosure to provide a naturally
ventilated bushing for switchgear.
[0008] It is an object of the present disclosure to provide a naturally
ventilated bushing, which is cost effective.
[0009] It is an object of the present disclosure to provide a naturally
ventilated bushing, which is cost efficient.
[0010] It is an object of the present disclosure to provide a naturally
ventilated bushing, which requires less maintenance.
SUMMARY
[0011] The present disclosure relates to the field of switchgear. More
particularly the present disclosure relates to a natural ventilated bushing for the switchgear.
[0012] An aspect of the present disclosure pertains to a primary
disconnector switch bushing (PDSB) adapted to be configured with a switchgear. The primary disconnector switch bushing includes a base section having a conducting element adapted to be configured with the switchgear. A first cylindrical section of a first diameter coupled to the base section, and configured to surround the conducting element. The first cylindrical section is open from an end away from the base section. A second cylindrical section of a second diameter coupled with the fist cylindrical section, and configured surround the conducting element. The second cylindrical section is configured with the base section such that there is a first gap between a first end of the second cylindrical section and the base section for facilitating an air ventilation passage around the conducting element.
[0013] In an aspect, the second cylindrical section may be coupled with
the first cylindrical section through any or combination of rib support, and block support coupled at inner periphery of the first cylindrical section.

[0014] In an aspect, any or combination of the rib support, and the block
support may be configured to keep the second cylindrical section at a distance
from the base section to maintain the first gap between the base section and the
second cylindrical section.
[0015] In an aspect, the first diameter may be greater than the second
diameter keeping a second gap between the first cylindrical section and the second
cylindrical section.
[0016] In an aspect, the second cylindrical section may be open at a
second end away from the conducting element.
[0017] In an aspect, the second cylindrical section may form a cavity
around the conducting element.
[0018] Various objects, features, aspects and advantages of the inventive
subject matter will become more apparent from the following detailed description
of preferred embodiments, along with the accompanying drawing figures in which
like numerals represent like components.
BRIEF DESCRIPTION OF DRAWINGS
[0019] The accompanying drawings are included to provide a further
understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. The diagrams are for illustration only, which thus is not a limitation of the present disclosure.
[0020] In the figures, similar components and/or features may have the
same reference label. Further, various components of the same type may be distinguished by following the reference label with a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label.

[0021] FIG. 1 illustrates an exemplary representation of primary
disconnector switch bushing (PDSB), in accordance with an embodiment of the present disclosure.
[0022] FIG. 2A illustrates an exemplary front view of the primary
disconnector switch bushing (PDSB) and FIG 2B illustrates an exemplary rear view of the primary disconnector switch bushing (PDSB), in accordance with an embodiment of the present disclosure.
[0023] FIG. 3A illustrates an exemplary side view of the primary
disconnector switch bushing (PDSB) and FIG. 3B illustrates an exemplary cross-section view of the primary disconnector switch bushing (PDSB), in accordance with an embodiment of the present disclosure.
[0024] FIG. 4 illustrates an exemplary air ventilation passage of in the
primary disconnector switch bushing (PDSB), in accordance with an embodiment of the present disclosure.
[0025] FIG. 5 illustrates an exemplary integration of the primary
disconnector switch bushing (PDSB) in a switchgear, in accordance with an embodiment of the present disclosure.
DETAILED DESCRIPTION
[0026] The following is a detailed description of embodiments of the
disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the present disclosure as defined by the appended claims.
[0027] In the following description, numerous specific details are set forth
in order to provide a thorough understanding of embodiments of the present invention. It will be apparent to one skilled in the art that embodiments of the present invention may be practiced without some of these specific details.

[0028] The present disclosure relates to the field of switchgear. More
particularly the present disclosure relates to a natural ventilated bushing for the
switchgear.
[0029] The present disclosure elaborates upon to a primary disconnector
switch bushing (PDSB) adapted to be configured with a switchgear. The primary
disconnector switch bushing includes a base section having a conducting element
adapted to be configured with the switchgear. A first cylindrical section of a first
diameter coupled to the base section, and configured to surround the conducting
element. The first cylindrical section is open from an end away from the base
section. A second cylindrical section of a second diameter coupled with the fist
cylindrical section, and configured surround the conducting element. The second
cylindrical section is configured with the base section such that there is a first gap
between a first end of the second cylindrical section and the base section for
facilitating an air ventilation passage around the conducting element.
[0030] In an embodiment, the second cylindrical section can be coupled
with the first cylindrical section through any or combination of rib support, and
block support coupled at inner periphery of the first cylindrical section.
[0031] In an embodiment, any or combination of the rib support, and the
block support can be configured to keep the second cylindrical section at a
distance from the base section to maintain the first gap between the base section
and the second cylindrical section.
[0032] In an embodiment, the first diameter can be greater than the second
diameter keeping a second gap between the first cylindrical section and the second
cylindrical section.
[0033] In an embodiment, the second cylindrical section can be open at a
second end away from the conducting element.
[0034] In an embodiment, the second cylindrical section can form a cavity
around the conducting element.
[0035] FIG. 1 illustrates an exemplary representation of primary
disconnector switch bushing (PDSB), in accordance with an embodiment of the
present disclosure.

[0036] FIG. 2A illustrates an exemplary front view of the primary
disconnector switch bushing (PDSB) and FIG 2B illustrates an exemplary rear view of the primary disconnector switch bushing (PDSB), in accordance with an embodiment of the present disclosure.
[0037] FIG. 3A illustrates an exemplary side view of the primary
disconnector switch bushing (PDSB) and FIG. 3B illustrates an exemplary cross-section view of the primary disconnector switch bushing (PDSB), in accordance with an embodiment of the present disclosure.
[0038] As illustrated, a primary disconnector switch bushing 100 can
include a base section 102. The base section can include a conducting element 104 that can be at a centre of the base section 102. The conducting element 104 can be adapted to be configured with a switchgear. The base section can be 102 made of a non-conducting material such as but not-limited to a non-metal. The conducting element 104 can be made of any conductive metal such as but without limiting to copper. The conducting element can be configured to provide an electrical connection between different chambers of the switchgear.
[0039] In an embodiment, the PDSB can include a first cylindrical section
106 of a first diameter. The first cylindrical section 106 can be coupled with the
base section 102, and can be configured to surround the conducting element 104.
The first cylindrical section 106 can be made of a non-conductive material, and
can be open at an end away from the base section 102. The PDSB can include a
second cylindrical section 108 of a second diameter coupled with the fist
cylindrical section 106. The second cylindrical sectionl08 can be configured to
surround the conducting element 102. The second cylindrical section 108 can be
configured with the base section 102 such that there is a first gap 110 between a
first end 112 of the second cylindrical section 108 and the base section 102 for
facilitating an air ventilation passage around the conducting element 104.
[0040] In an embodiment, the second cylindrical section 108 can be
coupled with the first cylindrical section 106 through any or combination of rib support 114, and block support coupled at inner periphery of the first cylindrical section 106. Any or combination of the rib support 114, and the block support can

be configured to keep the second cylindrical section 108 at a distance from the base section 102 to maintain the first gap 110 between the base section 102 and the second cylindrical section 108. The first diameter can be greater than the second diameter keeping a second gap 122 between the first cylindrical section 106 and the second cylindrical section 108. The second cylindrical section 108 can be open at a second end 116 away from the conducting element 104. The second cylindrical section 108 can form a cavity 118 around the conducting element 104.
[0041] FIG. 4 illustrates an exemplary air ventilation passage of in the
primary disconnector switch bushing (PDSB), in accordance with an embodiment of the present disclosure.
[0042] As illustrated, in an embodiment, during normal working condition
of the switchgear 120, rated voltage can be applied and rated current can flow through the conducting element 104 continuously. This flow of rated current through conducting element and removable contact can cause ohmic loss. Ohmic or heat loss of the removable contact can be higher because of high contact resistance of movable joints, which can increase the temperature of conducting element and the removable joint as well. This increase of conductor temperature causes heating of air surrounding the conductor and joints.
[0043] In an embodiment, as air outside PDSB and in Cable compartment
will be cooler than air near Conductor. It can create a natural air draft in the air ventilation passage (FIG. 4) of the PDSB. This can cause hot air near conducting element 104 to move towards area of cooler region due to pressure difference and the hot area near conductor can be replaced with cooler air. This natural convection or ventilations process can continuously replace hot air near conducting element 104 with cooler air from other part of compartment. This natural draft or ventilation can prevent overheating of PDSB conducting element 104 and movable joint and can provide cooling effect, maintaining the temperature of conductor within specified limits.

[0044] FIG. 5 illustrates an exemplary integration of the primary
disconnector switch bushing (PDSB) in a switchgear, in accordance with an embodiment of the present disclosure.
[0045] As illustrated, a cable compartment 122 of the switchgear 120 can
include air vent 124 on a front door and similar vent design on top of cable chamber which opens in arc duct of panel. The hot air inside cable chamber 122 can be continuously replaced by fresh ambient air from outside through natural convection by vents on front door and top of cable chamber 122 as shown in Fig. 5.
[0046] Moreover, in interpreting the specification, all terms should be
interpreted in the broadest possible manner consistent with the context. In particular, the terms "comprises" and "comprising" should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refer to at least one of something selected from the group consisting of A, B, C ....and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.
[0047] While the foregoing describes various embodiments of the
invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
ADVANTAGES OF THE INVENTION
[0048] The proposed invention provides a naturally ventilated bushing for
switchgear.

[0049] The proposed invention provides a naturally ventilated bushing,
which is cost effective.
[0050] The proposed invention provides a naturally ventilated bushing,
which is cost efficient.
[0051] The proposed invention provides a naturally ventilated bushing,
which requires less maintenance.
[0052] The proposed invention provides a naturally ventilated bushing,
which reduces the maximum temperature rise on sliding contact joint, hence
improving thermal performance of switchgear.
[0053] The proposed invention provides a naturally ventilated bushing,
which reduces the maximum temperature rise on sliding contact, hence improving
scope for copper conductor volume reduction, in turn reducing copper conductor
cost.

We Claim:

1. A primary disconnector switch bushing (PDSB) adapted to be configured
with a switchgear, the primary disconnector switch bushing comprising:
a base section having a conducting element adapted to be configured with the switchgear;
a first cylindrical section of a first diameter coupled to the base section, and configured to surround the conducting element, wherein the first cylindrical section is open from an end away from the base section; and
a second cylindrical section of a second diameter coupled with the fist cylindrical section, and configured surround the conducting element, wherein the second cylindrical section is configured with the base section such that there is a first gap between a first end of the second cylindrical section and the base section for facilitating an air ventilation passage around the conducting element.
2. The primary disconnector switch bushing as claimed in claim 1, wherein the second cylindrical section is coupled with the first cylindrical section through any or combination of rib support, and block support coupled at inner periphery of the first cylindrical section.
3. The primary disconnector switch bushing as claimed in claim 3, wherein any or combination of the rib support, and the block support is configured to keep the second cylindrical section at a distance from the base section to maintain the first gap between the base section and the second cylindrical section.
4. The primary disconnector switch bushing as claimed in claim 1, wherein the first diameter is greater than the second diameter keeping a second gap between the first cylindrical section and the second cylindrical section.
5. The primary disconnector switch bushing as claimed in claim 1, wherein the second cylindrical section is open at a second end away from the conducting element.

6. The primary disconnector switch bushing as claimed in claim 1, wherein the second cylindrical section forms a cavity around the conducting element.