Description:TECHNICAL FIELD
[0001] The present disclosure relates to compact secondary substation (CSS). More particularly the present disclosure relates an arrangement for accommodating flue gases in a CSS.

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] Compact secondary substation (CSS) is an electrical apparatus which converts medium voltage power of an electrical power distribution system into low voltage for public supply. A CSS comprises an enclosure (typically metal) divided into plurality of compartments corresponding to plurality of equipment. Such a design helps in isolation of faults occurring in equipment from other equipment in other corresponding compartments. The plurality of equipment includes but not limited to Medium voltage (MV) switchgear, distribution transformer, Low Voltage (LV) switchboards, connectors, and auxiliary equipment etc.
[0004] The equipment comprised within MV switchgear is generally insulated with air or an insulating gas (typically SF6). Similarly, equipment in other compartments may be insulated with air or the insulating gas. At the time of an electric failure in any compartment, an internal arc may be generated. The internal arc may lead to heating of air (or the insulating gas) resulting in generation of flue gases. The generation of flue gases may further lead to overpressure in the compartment which may cause components of equipment to be forcefully ejected into air. The release of flue gases and forceful ejection of component pose a physical threat to operator and public in proximity of the CSS thus it is essential for CSS to be able to handle an event of internal arc fault
[0005] One way of handling the event of internal arc is to release the flue gases into atmosphere through a upward facing duct, where the flue gases can expand and cool down. However, when internal arc fault occurs in transformer compartment volume available for flue gases to expand until it reaches the exhaust at roof is very less, the delay in relieving the pressure may hamper structural integrity of CSS. The prolonged exposure of shockwaves to load bearing element is one of the main reasons of damage to equipment. Therefore, there is need of improved CSS that is capable of safely handling such event in case the fault occurs in transformer compartment.
[0006] There is, therefore, a need for an improved CSS that is capable of safely handling such event in case the fault occurs in transformer compartment. The propose disclosure provide an arrangement through which bottom stand area is utilized to make and enclosure for the safe diffusion of the IAF gases. The bottom stand area is not utilized earlier. The bottom stand is interconnected through flap/s. During the event of Internal arc fault the flue gases reached the bottom enclosure and if the pressure and more volume is required it reaches the other bottom compartment through the flaps.

OBJECTS OF THE PRESENT DISCLOSURE
[0007] Some of the objects of the present disclosure, which at least one embodiment herein satisfy are as listed hereinbelow.
[0008] It is an object of the present disclosure to provide an bottom arrangement for CSS, which accommodate flue gases from the transformer compartment incase of internal arc fault.
[0009] It is an object of the present disclosure to provide a bottom arrangement for CSS, which is cost-effective as no moving components such as fan are used.
[0010] It is an object of the present disclosure to provide a bottom arrangement for CSS, which is requires less maintenance as no moving components are used.
[0011] It is an object of the present disclosure to provide a bottom arrangement for CSS, which is simple and easy to use.

SUMMARY
[0012] The present disclosure relates to compact secondary substation (CSS). More particularly the present disclosure relates an arrangement for accommodating flue gases in a CSS.
[0013] An aspect of the present disclosure pertains to an arrangement for accommodation of flue gases, in case of an internal arc fault, for a compact secondary substation (CSS). The arrangement includes a first base box configured to have a transformer compartment, of the CSS, positioned there above. A top surface of the first base box comprises a plurality of perforations for allowing the flue gases, generated due to the internal arc fault in the transformed compartment, in the transformed compartment into the first base box. A second base box configured to have a medium voltage (MV) compartment, of the CSS, positioned there above. The second base box is positioned on a first side of the first base box such that the second base box and the first base box has a common first side wall. A third base box configured to have a low voltage (LV) compartment, of the CSS, positioned there above. The third base box is positioned on a second side of the first base box such that the third base box and the first base box has a common second side wall. Any or combination of the first side wall and the second side wall comprises a pressure flap configured to be open by flue gases in the first base box.
[0014] In an aspect, the second base box and the third base box may comprise one or more V-shaped gas diffusers for slowing down a speed and impact of the flue gases on outer walls of the second base box and the third base box.
[0015] In an aspect, the first base box, the second base box, and the third base box may comprise steel channels for providing the structural support to the first base box, the second base box, and the third base box.
[0016] In an aspect, a position and working of the pressure flaps is in such a way that if the internal arc fault happens inside the transformer compartment, the flue gases and subsequent pressure may be passed through an aperture covered by the pressure flaps into any or combination of the second base boxes and the third base box.
[0017] 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
[0018] 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.
[0019] 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.
[0020] FIG. 1A illustrates an exemplary representation of a front view of an arrangement for accommodating flue gases in a CSS, in accordance with an embodiment of the present disclosure.
[0021] FIG. 1B illustrates an exemplary representation of a top view of an arrangement for accommodating flue gases in a CSS, in accordance with an embodiment of the present disclosure.
[0022] FIG. 2A illustrates an exemplary representation of pressure flaps, in accordance with an embodiment of the present disclosure.
[0023] FIG. 2B illustrates an exemplary representation of V-shaped diffusers, in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION
[0024] 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.
[0025] 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.
[0026] The present disclosure relates to compact secondary substation (CSS). More particularly the present disclosure relates an arrangement for accommodating flue gases in a CSS.
[0027] The present disclosure elaborates upon an arrangement for accommodation of flue gases, in case of an internal arc fault, for a compact secondary substation (CSS). The arrangement includes a first base box configured to have a transformer compartment, of the CSS, positioned there above. A top surface of the first base box comprises a plurality of perforations for allowing the flue gases, generated due to the internal arc fault in the transformed compartment, in the transformed compartment into the first base box. A second base box configured to have a medium voltage (MV) compartment, of the CSS, positioned there above. The second base box is positioned on a first side of the first base box such that the second base box and the first base box has a common first side wall. A third base box configured to have a low voltage (LV) compartment, of the CSS, positioned there above. The third base box is positioned on a second side of the first base box such that the third base box and the first base box has a common second side wall. Any or combination of the first side wall and the second side wall comprises a pressure flap configured to be open by flue gases in the first base box.
[0028] In an embodiment, the second base box and the third base box can comprise one or more V-shaped gas diffusers for slowing down a speed and impact of the flue gases on outer walls of the second base box and the third base box.
[0029] In an embodiment, the first base box, the second base box, and the third base box can comprise steel channels for providing the structural support to the first base box, the second base box, and the third base box.
[0030] In an embodiment, a position and working of the pressure flaps is in such a way that if the internal arc fault happens inside the transformer compartment, the flue gases and subsequent pressure can be passed through an aperture covered by the pressure flaps into any or combination of the second base boxes and the third base box.
[0031] FIG. 1A illustrates an exemplary representation of a front view of an arrangement for accommodating flue gases in a CSS, in accordance with an embodiment of the present disclosure.
[0032] FIG. 1B illustrates an exemplary representation of a top view of an arrangement for accommodating flue gases in a CSS, in accordance with an embodiment of the present disclosure.
[0033] FIG. 2A illustrates an exemplary representation of pressure flaps, in accordance with an embodiment of the present disclosure.
[0034] FIG. 2B illustrates an exemplary representation of V-shaped diffusers, in accordance with an embodiment of the present disclosure.
[0035] As illustrated, an arrangement for accommodation of flue gases, in case of an internal arc fault, for a compact secondary substation (CSS) 100 can include a first base box 202 configured to have a transformer compartment 102, of the CSS, positioned there above. A top surface of the first base box can include a plurality of perforations 202. The plurality of perforations 202-1 can allow the flue gases, generated due to the internal arc fault in the transformed compartment 102, in the transformed compartment 102 into the first base box 202.
[0036] In an embodiment, the arrangement can include a second base box 204 that can be configured to have a medium voltage (MV) compartment 104, of the CSS, positioned there above. The second base box 204 can be positioned on a first side of the first base box 202 such that the second base box 204 and the first base 202 box can have a common first side wall. In an embodiment, a position and working of the pressure flaps 208 is in such a way that if the internal arc fault happens inside the transformer compartment 102, the flue gases and subsequent pressure can be passed through an aperture covered by the pressure flaps 208 into any or combination of the second base box 104 and the third base box 106.
[0037] In an embodiment, the arrangement can include a third base box 206 that can be configured to have a low voltage (LV) compartment 106, of the CSS, positioned there above. The third base box 206 can be positioned on a second side of the first base box 202 such that the third base box 206 and the first base box 202 can have a common second side wall. Any or combination of the first side wall and the second side wall comprises a pressure flap 208 that can be configured to be open by a pressure of the flue gases in the first base box 202.
[0038] In an embodiment, the second base box 204 and the third base box 206 can include one or more V-shaped gas diffusers 210 for slowing down a speed and impact of the flue gases on outer walls of the second base box 204 and the third base box 206. In an embodiment, the first base box 202, the second base box 204, and the third base box 206 can comprise steel channels for providing the structural support to the first base box, the second base box, and the third base box.
[0039] 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.
[0040] 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
[0041] The proposed invention provides a bottom arrangement for CSS, which accommodate flue gases from the transformer compartment in-case of internal arc fault.
[0042] The proposed invention provides a bottom arrangement for CSS, which is cost-effective as no moving components such as fan are used.
[0043] The proposed invention provides a bottom arrangement for CSS, which is requires less maintenance as no moving components are used.
[0044] The proposed invention provides a bottom arrangement for CSS, which is simple and easy to use.
, Claims:1. An arrangement for accommodation of flue gases, in case of an internal arc fault, for a compact secondary substation (CSS), the arrangement comprises:
a first base box configured to have a transformer compartment, of the CSS, positioned there above, wherein a top surface of the first base box comprises a plurality of perforations for allowing the flue gases, generated due to the internal arc fault in the transformed compartment, in the transformed compartment into the first base box;
a second base box configured to have a medium voltage (MV) compartment, of the CSS, positioned there above, wherein the second base box is positioned on a first side of the first base box such that the second base box and the first base box has a common first side wall; and
a third base box configured to have a low voltage (LV) compartment, of the CSS, positioned there above, wherein the third base box is positioned on a second side of the first base box such that the third base box and the first base box has a common second side wall, wherein any or combination of the first side wall and the second side wall comprises a pressure flap configured to be open by flue gases in the first base box.

2. The arrangement as claimed in claim 1, wherein the second base box and the third base box comprise one or more V-shaped gas diffusers for slowing down a speed and impact of the flue gases on outer walls of the second base box and the third base box.

3. The arrangement as claimed in claim 1, wherein the first base box, the second base box, and the third base box comprise steel channels for providing the structural support to the first base box, the second base box, and the third base box.
4. The arrangement as claimed in claim 1, wherein a position and working of the pressure flaps is in such a way that if the internal arc fault happens inside the transformer compartment, the flue gases and subsequent pressure is passed through an aperture covered by the pressure flaps into any or combination of the second base boxes and the third base box.