Description:TECHNICAL FIELD
[0001] The present disclosure relates to shutter assembly used in Air Insulated Switchgear, and more particularly, about the shutter assembly arrangement that improves the dielectric clearance and reliability.

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] Air Insulated Switchgear (AIS) has application in electrical power transmission. It is installed for the protection and safety of other electrical equipment’s and operator/personnel. The Air Insulated Switchgear acts as a protection for other electrical equipment’s. The Air Insulated Switchgear is installed ahead of other vulnerable electrical equipment’s in the transmission phase of supply. During the event of any malfunction in the transmission line the Vacuum Circuit Breaker trip opens the Vacuum interrupters present in the Air Insulated Switchgear. This helps to isolate the healthy parts from the faulty parts of the transmission line. During this type of event we must do the maintenance work of the switchgear. The Vacuum Circuit Breaker in Air Insulated Switchgear is removable type. The VCB is removed from the VCB chamber of the AIS. When we are removing the VCB the Primary disconnector switch (PDS) of cable side and the busbar side are exposed. To cover the PDS a shutter assembly is employed. The shutter assembly ensures that the PDS ends at the VCB chamber of AIS remains in covered state till the VCB is inserted back in the VCB chamber. The shutter helps to prevent any mis happenings. The shutter operated by VCB when the VCB is pushed inside the shutter opens and allow the VCB arms to enter the PDS of cable and busbar side.
[0004] There is, therefore, a need for an improved shutter assembly helps to improve the clearance between the shutter, the cable and busbar contacts.

OBJECTS OF THE PRESENT DISCLOSURE
[0005] Some of the objects of the present disclosure, which at least one embodiment herein satisfy are as listed herein below.
[0006] It is an object of the present disclosure to provide a shutter assembly for an air insulated switchgear, which has increase dielectric clearance for accommodating contact arms of the vacuum circuit breaker.
[0007] It is an object of the present disclosure to provide a shutter assembly for an air insulated switchgear, which has reduced mechanical assembly than conventional shutter assembly.
[0008] It is an object of the present disclosure to provide a shutter assembly for an air insulated switchgear, which is cost effective as the mechanical linkages are reduced.
[0009] It is an object of the present disclosure to provide a shutter assembly for an air insulated switchgear, which is simple and easy to operate.
[0010] It is an object of the present disclosure to provide a shutter assembly for an air insulated switchgear, which has single busbar and cable flap which helps to get more dielectric gap compare to the existing shutter assembly which has two flaps for busbar and cable.

SUMMARY
[0011] The present disclosure relates to shutter assembly used in Air Insulated Switchgear, and more particularly, about the shutter assembly that arrangement improves the dielectric clearance and reliability.
[0012] An aspect of the present disclosure pertains to a shutter assembly for an air insulated switchgear. The shutter assembly includes a first operating link and a second operating link. The first operating link and the second operating links are configured to be actuated by actuators of a vacuum circuit breaker while rack in and rack out operation of the vacuum circuit breaker. A third operating link, configured to operate a busbar shutter, coupled with the first operating link. An actuation of the first operating link facilitates a clockwise rotation of the busbar shutter using the busbar operating link. A fourth operating link, configured to operate a cable shutter, coupled with the first operating link. An actuation of the first operating link facilitates an anti-clockwise rotation of the cable shutter through the fourth operating link.
[0013] In an aspect of the right hand side view of the panel, the busbar shutter may be rotated clock-wise till a pre-defined angle for allowing first contact arms of the vacuum circuit breaker electrically connected with busbar contacts
[0014] In an aspect of the right hand side view of the panel, the cable shutter may be rotated anti-clockwise till the pre-defined angle for allowing second contact arms of the vacuum circuit breaker electrically connected with cable contacts of the air insulated switchgear.
[0015] In an aspect, the busbar shutter and the cable shutter may be mounted on brackets coupled with vacuum circuit breaker chamber through supports.
[0016] 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
[0017] 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.
[0018] 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.
[0019] FIG. 1A illustrates an exemplary representation of the shutter assembly when the VCB is in test condition or rack out, in accordance with an embodiment of the present disclosure.
[0020] FIG. 1B illustrates an exemplary representation of the shutter assembly when the VCB is in service condition or rack in, in accordance with an embodiment of the present disclosure.
[0021] FIG. 2 illustrates a conventional vacuum circuit breaker.
[0022] FIG. 3 Illustrates an air insulated switchgear sub cubicle with conventional shutter assembly for air insulated switchgear.

DETAILED DESCRIPTION
[0023] 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.
[0024] 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.
[0025] The present disclosure relates to shutter assembly used in Air Insulated Switchgear, and more particularly, about the shutter assembly that arrangement improves the dielectric clearance and reliability.
[0026] The present disclosure elaborates upon a shutter assembly for an air insulated switchgear. The shutter assembly includes a first operating link and a second operating link. The first operating link and the second operating links are configured to be actuated by actuators of a vacuum circuit breaker while rack in and rack out operation of the vacuum circuit breaker. A third operating link, configured to operate a busbar shutter, coupled with the first operating link. An actuation of the first operating link facilitates a clockwise rotation (from RHS view) of the busbar shutter using the busbar operating link. A fourth operating link, configured to operate a cable shutter, coupled with the first operating link. An actuation of the first operating link facilitates an anti-clockwise rotation (from RHS view) of the cable shutter through the fourth operating link.
[0027] In an embodiment, the busbar shutter can be rotated clock-wise (from RHS view) till a pre-defined angle for allowing first contact arms of the vacuum circuit breaker electrically connected with busbar contacts
[0028] In an embodiment, the cable shutter can be rotated anti-clockwise (from RHS view) till the pre-defined angle for allowing second contact arms of the vacuum circuit breaker electrically connected with cable contacts of the air insulated switchgear.
[0029] In an embodiment, the busbar shutter and the cable shutter can be mounted on brackets coupled with vacuum circuit breaker chamber through supports.
[0030] FIG. 1A illustrates an exemplary representation of the shutter assembly when the VCB is in test condition or rack out, in accordance with an embodiment of the present disclosure.
[0031] FIG. 1B illustrates an exemplary representation of the shutter assembly when the VCB is in service condition or rack in, in accordance with an embodiment of the present disclosure.
[0032] FIG. 2 illustrates a conventional vacuum circuit breaker.
[0033] As illustrated, vacuum circuit breaker (VCB) has two rollers 13 on its either sides to operate shutter assembly when it is rack inside or rack out of VCB chamber. When rack in the shutter opens and busbar side primary disconnector switch 3 and cable side bushing 4 is visible. During rack out the shutter covers the busbar side primary disconnector switch 3 and Cable Side Bushing 4.
[0034] FIG. 3 Illustrates an air insulated switchgear sub cubicle with conventional shutter assembly for air insulated switchgear.
[0035] As illustrated, a shutter assembly 100 (Not mentioned in the PDF drawing) for an air insulated switchgear can include a first operating link 7 and a second operating link 10. The first operating link 7 and the second operating links 10 can be configured to be actuated by actuators 13 of a vacuum circuit breaker while rack in and rack out operation of the vacuum circuit breaker. A third operating link 8 can be configured to operate a busbar shutter 1. The third operating link 8 can be configured with the first operating link 7. An actuation of the first operating link 7 can facilitate a clockwise rotation (in right hand side “RHS” view) of the busbar shutter 1 using the third operating link 8 during rack in operation and vice versa. The busbar shutter can be configured to cover busbar connects of the air insulated switchgear when the vacuum circuit breaker is in service condition or rack out.
[0036] In an embodiment, a fourth operating link 11 can be configured to operate a cable shutter 2. The fourth operating link can be configured with the second operating link 10. An actuation of the second operating link 10 can facilitate an anti-clockwise rotation (in left hand side “LHS” view) of the cable shutter 2 through the fourth operating link 11 during rack in operation and vice versa. In an embodiment, the busbar shutter 1 can be rotated clock-wise (in RHS view) till a pre-defined angle for allowing first contact arms of the vacuum circuit breaker electrically connected with busbar contacts.
[0037] In an embodiment, the cable shutter 2 can be rotated anti-clockwise (in RHS view) till the pre-defined angle for allowing second contact arms of the vacuum circuit breaker (VCB) electrically connected with cable contacts of the air insulated switchgear. In an embodiment, the busbar shutter 1 and the cable shutter 2 can be mounted on brackets 5 coupled with vacuum circuit breaker chamber through supports 6. The pre-defined angle can be such that the first contact arms and the second contact arms of the VCB have enough room and dielectric gap to make electrical connection with the busbar contacts and the cable contact of the air insulated switchgear, respectively.
[0038] 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, 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.
[0039] 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
[0040] The proposed invention provides a shutter assembly for an air insulated switchgear, which has increase dielectric clearance for accommodating contact arms of the vacuum circuit breaker.
[0041] The proposed invention provides a shutter assembly for an air insulated switchgear, which has reduced mechanical assembly than conventional shutter assembly.
[0042] The proposed invention provides a shutter assembly for an air insulated switchgear, which is cost effective as the mechanical linkages are reduced.
[0043] The proposed invention provides a shutter assembly for an air insulated switchgear, which is simple and easy to operate.
, Claims:1. A shutter assembly for an air insulated switchgear, the shutter assembly comprising:
a first operating link;
a second operating link, wherein the first operating link and the second operating links are configured to be actuated by actuators of a vacuum circuit breaker while rack in and rack out operation of the vacuum circuit breaker;
a third operating link, configured to operate a busbar shutter, coupled with the first operating link, wherein an actuation of the first operating link facilitates a clockwise rotation (RHS view) of the busbar shutter using the busbar operating link; and
a fourth operating link, configured to operate a cable shutter, coupled with the first operating link, wherein an actuation of the first operating link facilitates an anti-clockwise rotation (RHS view) of the cable shutter through the fourth operating link.
2. The shutter assembly as claimed in claim 1, wherein the busbar shutter is rotated clock-wise till a pre-defined angle for allowing first contact arms of the vacuum circuit breaker electrically connected with busbar contacts
3. The shutter assembly as claimed in claim 1, wherein the cable shutter is rotated anti-clockwise till the pre-defined angle for allowing second contact arms of the vacuum circuit breaker electrically connected with cable contacts of the air insulated switchgear.
4. The shutter assembly as claimed in claim 1, wherein the busbar shutter and the cable shutter are mounted on brackets coupled with vacuum circuit breaker chamber through supports.