FIELD OF INVENTION
[001] Present invention relates to optimisation of three phase Gas
insulated Switchgear (GIS) of both single and double Gas insulated
bus configuration. An innovative multi-module housing is proposed
to plug-in various modules of high voltage (<145 kV), extra high
voltage (<400 kV), ultra-high voltage (>400 kV) class rated GIS to
meet any configuration of gas insulated switchgear like incomer,
feeder, transformer bay, sectionalizer, bus coupler. The invention
specifically proposed a novel concept to limit number of leakage
points, cost of product and space requirements.
BACKGROUND AND THE PRIOR ART
[002] Gas insulated substations can be indoor type when they are
installed in the buildings or outdoor type when they are installed in
switchyard. Most of the Gas Insulated substations are located in the
urban area, where space shall be the main constrain for installation
of the bay. Gas insulated switchgear shall be offered in various
schemes like single bus, double bus, one-and-half breaker, main
and transfer bus, double bus and double breaker, ring bus etc. In
each bus bar arrangement, there is possibility of different types of
bay configurations such as incomer, feeder (line / reactor),
transformer bay, bus coupler (double bus), bus sectionalizer and
potential transformer bay. In each bay configuration, it is further
possible to use different type of terminal equipment like gas-to-air
bushing or gas-to-oil bushing or gas-to-cable termination or gas
insulated bus duct. Again depending on its application in power
station like hydro, thermal or in T&D substations, the terminal

equipment can be installed in vertical (upward/ downward) or
horizontal direction.
[003] In practical electric power systems, it is often required to
integrate the new gas insulated electric system with existing air
insulated electric system. In such circumstances there is a need of
suitable system which shall interconnect those two electric systems.
The gas-insulated switchgear comprising of metal-clad gas insulated
modules of circuit breakers, disconnector switches, maintenance
and fast acting earthing switches, current transformers, potential
transformers, surge arresters, gas insulated bus duct and gas-to-
air, gas-to-cable , gas-to-oil terminations. In all these components,
SF6 gas serves as the main insulation. A hybrid switchgear is one
that combines the components of traditional air-insulated
switchgear (AIS) and SF6 gas-insulated switchgear (GIS)
technologies. In conventional gas insulated switchgear, separate
housing is used for each GIS module and number of support
insulators, conductors and seals requirement is generally high.
Further, gas leakage rate increases because of increase in number
of leak points.
[004] In a gas insulated switchgear bay, there are mainly two parts.
One is bus side section and other one is feeder or load side section.
These two sections are electrically separated by using gas circuit
breaker. To create provisions of necessary isolation of switchgear
bay disconnector switches and earthing switches are accommodated
on either side of circuit breaker. These earthing switches are again
may be maintenance or fault proof depending on its location in
switchgear bay. On Bus side, these disconnector and earthing
switches are terminated with compact or segregated phase bus
depending on voltage class. On Feeder side, these switches are

terminated with surge arrester, potential transformer and terminal
equipment. The terminal equipment may be gas-to-cable
termination or gas-to-air bushing or gas-to-oil bushing or gas
insulated bus duct. The dimensions of all these modules occupy at
least 30 to 40 % size of the bay. This may result to increase in cost
of product, more number of leakage points and increase in foot print
dimensions.
[005] US 7990688 B2, US 2014/0211378 A1, US 5754382, US
6614648 B2 discuss gas insulated switchgear of various
conventional substation arrangements showing the separate
housing for each module that occupy lot of space and also requires
large material content. US 7250583 B2, US 7075778 B2 relates to
gas insulated switch gear device where bus duct or option of gas-to-
cable bushing or any other termination is not possible.
[006] Therefore, there has been a need to add corresponding
modules as separate entities.
[007] The present invention relates to three phase gas insulated
switchgear, particularly integration of various GIS modules in the
formation of configurations like incomer, feeder, transformer bay,
bus coupler, bus sectionalizer etc. The non-standard modules are
used to integrate gas insulated switchgear modules to form various
configurations schemes of gas insulated switchgear. These modules
vary from one voltage class to other and type of building
configuration. Such designs are critical at higher system voltages
from reliability, leak rate and cost point of view. Hence, the present
invention aims to address the above problems. None of the prior art
references have the characteristics of the present invention.

OBJECTS OF INVENTION
[008] Therefore, the objective of the present invention is to propose
a common housing to accommodate disconnector cum maintenance
earthing switch (DS MES), fast acting earthing switch (FES), surge
arrester (SA), potential transformer (PT), terminal equipment like
gas-to-air bushing, gas-to-cable termination, gas-to-oil bushing, gas
insulated bus duct.
[009] Another object of the present invention is to propose a common
housing to accommodate all possible gas insulated switchgear
configurations like incomer, feeder, transformer bay, bus coupler,
bus sectionalizer, potential transformer bay.
[010] Another object of the invention is to propose a common
housing to accommodate gas-to-air bushings or gas-to-cable
termination or gas-to-oil bushing or gas insulated bus duct without
any modification of housing, with terminations made in all
orientations like horizontally or vertically (upward/downward) as
required.
[011] Another object of the invention is to propose a common
housing so that multiple modules on feeder side of circuit breaker
can be accommodated in single housing depending on type of GIS or
hybrid GIS (H-GIS) bay configuration.
[012] Further object of the invention is to propose a compact
common housing so that multiple modules on feeder side can have
plug-in provision as per required GIS or H-GIS configuration.
[013] Further object of the invention is to propose a compact
common housing having provision for multiple modules and

accessories like moisture absorbents, pressure relief valve, gas filling
and measuring port, viewing port etc.
[014] Further object of the invention is to propose a compact
common housing with high voltage connection as required and all
modules can be plugged in as per requirement.
[015] Further object of the invention is to propose a compact
common housing with a unique modular angled enclosure for all
three phases to achieve necessary phase distance between gas-to-
air bushings in open air.
[016] Further object of the invention is to propose a compact
common housing having provision for multiple GIS modules and
reduced bay foot print.
[017] Yet another object of the invention is to propose a compact
common housing having provision for multiple GIS modules and can
be installed as hybrid GIS in air insulated substations.
[018] Yet another object of the invention is to propose a compact
common housing replacing all air insulated modules in hybrid GIS
like surge arrester, potential transformer as gas insulated modules.
[019] Yet another object of the invention is to propose a compact
common housing to ensure reliability of hybrid GIS same as GIS by
eliminating air insulated modules in conventional H-GIS
configurations.
[020] Yet another object of the invention is to propose a compact
common housing having provision for multiple GIS modules and can
be installed in any location like indoor or outdoor and can be in any
type of power generation unit like hydro, thermal, etc.

SUMMARY OF THE INVENTION
[021] The proposed invention relates to gas insulated common
housing accommodating multiple modules to meet any configuration
of gas insulated switchgear. The proposed disclosure is directly
integrated with Disconnector cum maintenance earthing switch (DS
MES), fast acting earthing switch (FES), surge arrester (SA),
potential transformer (PT), terminal equipment like gas-to-air
bushing, gas-to-oil bushing, gas-to-cable bushing and gas insulted
bus duct and facilitated with necessary HT connection and has
provision to plug-in necessary modules demanded by GIS
configuration. It can be used as part of H-GIS to achieve highest
reliability in service on par with GIS. GIS is terminated with different
types of equipment like gas-to-air bushing or gas-to-oil bushing or
gas-to-cable termination or gas insulated bus duct. The dimensions
of GIS vary with each termination equipment and each
configuration. Hence, there is no modularity in offering solution to
utility. The existing hybrid GIS cannot provide other type of
termination equipment in the switchyard, if necessary. This type of
configuration may not be as reliable like GIS as few modules are still
AIS type. To overcome this problem, proposed multi-module housing
helps to facilitate all modules in gas insulation environment and
reliability of hybrid GIS is achieved on par with GIS.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[022] 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.

[023] The figures depict embodiments of the disclosure for purposes
of illustration only. One skilled in the art will readily recognize from
the following description that alternative embodiments of the
structures and methods illustrated herein may be employed without
departing from the principles of the disclosure described herein.
[024] The present subject matter would be described in greater detail
with reference to the following figures. It should be noted that the
description merely illustrates the principles of the present subject
matter. It will thus be appreciated that those skilled in the art will
be able to devise various arrangements that, although not explicitly
described herein, embody the principles of the present subject
matter and are included within its scope. The present invention will
now be described more specifically with reference to the following
specification.
[025] Figure 1: Compact Multi-module housing [01]
[026] Figure 2: HT connection for Multi-module housing [01]
[027] Figure 3: Configuration of Multi-module housing with Gas-to-
cable Termination [08]
[028] Figure 4: Configuration of Multi-module housing with Gas-to-
oil bushing [07]
[029] Figure 5: Configuration of Multi-module housing with Gas
insulated bus duct [09]
[030] Figure 6: Configuration of Multi-module housing with Gas-to-
Air bushing [06]

[031] Figure 7: A Novel Unique Angled Enclosure and Angled
Conductor [14] assembly for Gas-to-Air bushing [06]
[032] Figure 8: Feeder-side Modules for (a) gas insulated and (b)
hybrid gas insulated Switchgear with Gas-to-air bushing [06]
module
DETAIL DESCRIPTION OF THE PREFERRED EMBODIMENTS OF
THE PRESENT INVENTION WITH REFERENCE TO THE
ACCOMPANYING DRAWINGS
[033] While the embodiments of the disclosure are subject to various
modifications and alternative forms, specific embodiment thereof
have been shown by way of example in the figures and will be
described below. It should be understood, however, that it is not
intended to limit the disclosure to the particular forms disclosed, but
on the contrary, the disclosure is to cover all modifications,
equivalents, and alternative falling within the scope of the
disclosure.
[034] The terms “comprises”, “comprising”, or any other variations
thereof used in the disclosure, are intended to cover a non-exclusive
inclusion, such that a device, system, assembly that comprises a list
of components does not include only those components but may
include other components not expressly listed or inherent to such
system, or assembly, or device. In other words, one or more elements
in a system or device proceeded by “comprises… a” does not, without
more constraints, preclude the existence of other elements or
additional elements in the system or device.

[035] Figure 1 shows the multi-module housing proposed in the
present invention. The present invention discloses a common
housing to accommodate disconnector cum maintenance earthing
switch [02], fast acting earthing switch [03], surge arrester [04],
potential transformer [05], terminal equipment like gas-to-air
bushing [06], gas-to-oil bushing [07] or gas-to-cable termination [08]
or gas insulated bus duct [09] without any modification of housing,
with terminations made in all orientations like horizontally or
vertically (upward/downward) as required.
[036] The multi-module enclosure [01] is divided into two shells.
First shell is called Switchgear shell or dynamic equipment shell
[01A] and second one is called static equipment or termination
equipment shell [01B]. Each shell is a four-way connector and is
joined by standard tube [01C]. The multi-module is basically made
from standard tube with plurality of ports (port I-port VI) [01D-01I]
as shown in Figure 2.
[037] The dynamic equipment shell [01A] has mainly three modules
among which port I [01D] is integrated to DS-MES module [02], port
II [01E] is connected to FES module [03] and port III [01F] is
connected to surge arrester [04] (Referring Figure 2).
[038] The terminal equipment shell [01B] has mainly three modules:
first one is port IV [01G] connected to potential transformer [05]
(Figure 6) or gas-to-oil bushing [07] (Figure 4) or gas-to-cable
termination [08] (Figure 3) or gas insulated bus duct [09] (Figure
5). Second port of terminal equipment shell [01B], port V [01H] is
connected to either gas-to-air bushing [06] (Figure 6) or potential
Transformer [05] (Figure 3 or Figure 4). The third port of terminal
equipment shell, port VI [01I] is connected to [09] or to a special
housing to keep moisture absorbents [13] (Figure 5). The moisture

absorbent member [13] can be plugged at port IV [01G] or port V
[01H] (Figure 3). Port V [01H] is connected to gas-to-air bushing [06]
through angled enclosures [14] (Figure 7). When Port V [01H] is
connected to gas-to-air bushing [06], port IV [01G] is connected to
potential transformer [05] (Figure 6). In case of non-requirement of
any GIS module, the proposed multi-module housing [01] has the
feature to close the concerned port with dummy cover.
[039] The multi-module enclosure [01] is facilitated with necessary
protection from high pressures i.e. pressure relief valve [10], viewing
of FES contact position i.e. viewing port [11] and gas filling and
measurement provisions [12] as illustrated in Figure 2. The multi-
module enclosure [01] is facilitated with moisture absorbents
envelope [13] to hold moisture absorbents and keep gas in the
modules free from moisture as illustrated in Figure 1.
[040] The proposed disclosure provides an integration of various
modules of gas insulated switchgear (GIS) and hybrid gas insulated
switchgear (H-GIS). High voltage connection consists of mainly a pair
of spherical connectors i.e. spherical connector - I [15] and spherical
connector – II [16] and their integration (Figure 1). Spherical
connectors [15, 16] are integrated by using current transfer bridge
[17] (Figure 2). The said spherical connectors [15, 16] are connected
symmetrically inside the multi-module enclosure [01] in back-to-
back configuration and each one is supported from different support
insulators. Spherical connector I [15] is supported from DS-MES
insulator [02A] of [02] and surge arrester support insulator [04A] of
[04]. The spherical connector I [15] is facilitated with fixed contact
assembly [03A] of fast acting earthing switch [03] (Figure 1, 2). From
Port II [01E], ES moving contact assay [03B] is engaged to Spherical
connector - I [15] through fixed contact assembly [03A] (Figure 2).

[041] Spherical connector- II [16] is supported from PT side insulator
[05A] of [05] and gas-to-air bushing side insulator [06A] of [06] or
gas-to-oil bushing side insulator [07A] of [07] or gas-to-cable
termination side insulator [08A] of [08] or gas insulated bus duct
insulator [09A] of [09] according to different embodiments.
[042] Figure 4 shows HT connections of multi-module enclosure
assembly. The spherical connectors [15, 16] are facilitated with
multiple plug-in terminals to integrate different switchgear modules.
Different possible embodiments can be achieved with the multi-
module housing [01] with DS/MES [02] at port I, FES [03] at port II,
SA [04] at port III and they are as follows:
[043] In an embodiment, connection of DS/MES [02]– FES [03]– SA
[04]– Gas to cable termination [08]- PT [05] is configured. The gas-
to-cable termination [08] is connected to port IV [01G] and potential
transformer [05] is connected to port V [01H]. Spherical connector –
II [16] at port IV [01G] is supported by gas-to-cable termination side
insulator [08A] of [08]. Spherical connector – II [16] at port V [01H]
is supported by potential transformer side insulator [05A]. Potential
transformer [05] is connected to potential transformer side insulator
[05A] through adapter or expansion chamber [05B]. Figure 3 shows
the multi-module enclosure assembly [01] with gas-to-cable
termination [08] configuration. Configuration of Spherical connector
– II [16] is shown in cross-sectional view in Figure 2.
[044] In another embodiment, connection between DS/MES [02]–
FES [03]– SA [04]– Gas to Oil Bushing [07]– PT [05] is configured.
The gas-to-oil bushing [07] is connected to port IV [01G] and
potential transformer [05] is connected to port V [01H]. Here gas-to-
oil bushing [07] is connected to the power transformer located in

cellar /one level down floor through gas insulated bus duct [09].
Spherical connector – II [16] at port IV [01G] is supported by gas-to-
oil bushing side insulator [07A]. Spherical adapter – II [16] at port V
[01H] is supported by potential transformer side insulator [05A].
Potential transformer [05] is connected to potential transformer side
insulator [05A] through adapter or expansion chamber [05B]. Figure
4 shows the multi-module enclosure assembly with gas-to-oil
bushing [07] configuration.
[045] In another embodiment, connection between DS/MES [02]–
FES [03] – SA [04]–Gas insulated bus duct [09]– PT [05] is
configured. The gas insulated bus duct [09] is connected to port IV
[01G] or port VI [01I] and potential transformer [05] is connected to
port V [01H] or port IV [01G]. The gas insulated bus duct [09] can
extend to cellar /one level down floor or through wall of GIS building
to switchyard for further extension to transformer or reactor etc.
Spherical connector – II [16] at port IV [01G] is supported by gas
insulated bus duct side insulator [09A] of [09] or potential
transformer side insulator [05A]. Spherical adapter – II [16] at port
V [01H] is supported by potential transformer side insulator [05A] or
gas insulated bus duct side insulator [09A]. Moisture absorbent
envelope [13] is provided on port IV [01G] or port V [01H] or port VI
[01I]. Potential transformer [05] is connected to potential
transformer side insulator [05A] through adapter / expansion
chamber [05B]. Figure 5 shows the multi-module enclosure
assembly with gas insulated bus duct [09] configuration.
[046] In another embodiment, connection between DS/MES [02]–
FES [03]– SA [04]– PT [05]– Gas to Air Bushing [06] is configured.
The gas-to-air bushing [06] is connected to port V [01H] and
potential transformer [05] is connected to port IV [01G]. Here gas-to-

air bushing [06] is connected if GIS is used for outdoor applications
or if the switchgear is used for H-GIS applications. Spherical adapter
– II [16] at port V [01H] is supported by gas-to-air bushing side
insulator [06A]. Spherical adapter – II [16] at port IV [01G] is
supported by potential transformer side insulator [05A]. Potential
transformer [05] is connected to potential transformer side insulator
[05A] through adapter / expansion chamber [05B]. Figure 6 shows
the multi-module enclosure assembly with gas-to-air bushing
configuration.
[047] Gas-to-air bushings [06] are connected through angled
enclosures [14]. As the phase distance of GIS is different from phase
distance of air insulated bus, gas-to-air bushings [06] shall be
mounted through unique angled enclosure [14]. Novelty of present
design is that the angled enclosure [14] is also same for all three
phases to maintain modularity. The angular orientation of ports was
required for mounting of terminal bushings at an angle, which would
provide safe working clearances for the rated and test voltages.
Further, angled conductors [18] to suit the said orientation are
essential for efficient current transfer. Suitable Plug-in terminal cum
shields [19] are provided to make the high voltage electric filed more
and more uniform. Figure 7 shows the unique angled enclosure
[14] and angled conductor [18] assembly with gas-to-air bushing [06]
configuration.
[048] Total eight gas insulated switchgear modules can be extended
using the multi-module housing. All terminal equipment are plugged
from different ports as, gas-to-air bushing [06] at port V [01H], gas-
to-cable termination [07] or gas-to-oil bushing [08] at port IV [01G],
gas insulated bus duct [09] at port IV [01G] or port VI [01I] as
mentioned with potential transformer [05] on port V [01H] or port IV

[01G] and Spherical connector II at port IV or port V respectively.
Moisture absorbent envelope [13] is plugged on at port IV [01G] or
port V [01H] or port VI [01I] as per requirement. Three other modules
that can be plugged into multi-module housing is DS-MES [02] on
port I[01D], fast acting earthing switch [03] on port II [01E] and surge
arrester [04] on port III [01F]. The module has provision to keep
dummy cover with or without support insulator [02A to 09A], in case
particular module is not envisaged for specified GIS or H-GIS
configuration (Figure 7).
[049] The present invention provides a common housing to
accommodate all possible gas insulated switchgear configurations
like incomer, feeder, transformer bay, bus coupler, bus sectionalizer,
potential transformer bay. In hybrid gas insulated switchgear, main
switchgear elements like gas circuit breaker [20], current
transformer [21], bus disconnector switches [22], bus side
maintenance earthing switch [23], feeder disconnector cum earthing
switch [02] are only used in gas insulated environment. Remaining
modules like surge arrester [04], potential transformer [05] are of
gas insulated type instead of conventional air insulated type. Gas-
to-air bushings [06] are used to extend HT connection from Bus-I
[24], Bus–II [25] and from feeder. Figure 8 show modules on feeder
side for both (a) gas insulated and (b) hybrid gas insulated
switchgear with Gas-to-air bushing module [06].
[050] The present disclosure provides a common housing so that
multiple modules on feeder side of circuit breaker can be
accommodated in single housing with reduced bay foot print and
can have plug-in provision depending on type of GIS or H-GIS bay
configuration. It provides a compact common housing to ensure
reliability of hybrid GIS same as GIS by eliminating air insulated

modules in conventional H-GIS configurations. The present
disclosure can be installed in any location like indoor / outdoor and
can be in any type of power generation unit like hydro, thermal, etc.
[051] Although embodiments for the present subject matter have
been described in language specific to package features, it is to be
understood that the present subject matter is not necessarily limited
to the specific features described. Rather, the specific features and
methods are disclosed as embodiments for the present subject
matter. Numerous modifications and adaptations of the method of
the present invention will be apparent to those skilled in the art, and
thus it is intended by the appended claims to cover all such
modifications and adaptations which fall within the scope of the
present subject matter.
[052] It will be understood by those within the art that, in general,
terms used herein, and especially in the appended claims (e.g.,
bodies of the appended claims) are generally intended as “open”
terms (e.g., the term “including” should be interpreted as “including
but not limited to,” the term “having” should be interpreted as
“having at least,” the term “includes” should be interpreted as
“includes but is not limited to,” etc.). It will be further understood by
those within the art that if a specific number of an introduced claim
recitation is intended, such an intent will be explicitly recited in the
claim, and in the absence of such recitation no such intent is
present. For example, as an aid to understanding, the following
appended claims may contain usage of the introductory phrases “at
least one” and “one or more” to introduce claim recitations. However,
the use of such phrases should not be construed to imply that the
introduction of a claim recitation by the indefinite articles “a” or “an”
limits any particular claim containing such introduced claim

recitation to inventions containing only one such recitation, even
when the same claim includes the introductory phrases “one or
more” or “at least one” and indefinite articles such as “a” or “an”
(e.g., “a” and/or “an” should typically be interpreted to mean “at
least one” or “one or more”); the same holds true for the use of
definite articles used to introduce claim recitations. In addition, even
if a specific number of an introduced claim recitation is explicitly
recited, those skilled in the art will recognize that such recitation
should typically be interpreted to mean at least the recited number
(e.g., the bare recitation of “two recitations,” without other modifiers,
typically means at least two recitations, or two or more recitations).
Furthermore, in those instances where a convention analogous to
“at least one of A, B, and C, etc.” is used, in general such a
construction is intended in the sense one having skill in the art
would understand the convention (e.g., “a system having at least one
of A, B, and C” would include but not be limited to systems that have
A alone, B alone, C alone, A and B together, A and C together, B and
C together, and/or A, B, and C together, etc.). In those instances
where a convention analogous to “at least one of A, B, or C, etc.” is
used, in general such a construction is intended in the sense one
having skill in the art would understand the convention (e.g., “a
system having at least one of A, B, or C” would include but not be
limited to systems that have A alone, B alone, C alone, A and B
together, A and C together, B and C together, and/or A, B, and C
together, etc.). It will be further understood by those within the art
that virtually any disjunctive word and/or phrase presenting two or
more alternative terms, whether in the description, claims, or
drawings, should be understood to contemplate the possibilities of
including one of the terms, either of the terms, or both terms. For

example, the phrase “A or B” will be understood to include the
possibilities of “A” or “B” or “A and B.”
[053] It will be further appreciated that functions or structures of a
plurality of components or steps may be combined into a single
component or step, or the functions or structures of one-step or
component may be split among plural steps or components. The
present invention contemplates all of these combinations. Unless
stated otherwise, dimensions and geometries of the various
structures depicted herein are not intended to be restrictive of the
invention, and other dimensions or geometries are possible. In
addition, while a feature of the present invention may have been
described in the context of only one of the illustrated embodiments,
such feature may be combined with one or more other features of
other embodiments, for any given application. It will also be
appreciated from the above that the fabrication of the unique
structures herein and the operation thereof also constitute methods
in accordance with the present invention. The present invention also
encompasses intermediate and end products resulting from the
practice of the methods herein. The use of “comprising” or
“including” also contemplates embodiments that “consist essentially
of” or “consist of” the recited feature.

ADVANTAGE OF THE INVENTION
[054] The advantage of the present invention is that it proposes a
common housing to accommodate disconnector cum maintenance
earthing switch (DS MES), fast acting earthing switch (FES), surge
arrester (SA), potential transformer (PT), terminal equipment like
gas-to-air bushing, gas-to-cable termination, gas-to-oil bushing, gas
insulated bus duct.
[055] Another advantage of the present invention is that it discloses
a common housing to accommodate all possible gas insulated
switchgear configurations like incomer, feeder, transformer bay, bus
coupler, bus sectionalizer, potential transformer bay.
[056] Another advantage of the present invention is that it proposes
a common housing to accommodate gas-to-air bushings or gas-to-
cable termination or gas-to-oil bushing or gas insulated bus duct
without any modification of housing, with terminations made in all
orientations like horizontally or vertically (upward/downward) as
required.
[057] Further advantage of the present invention is that it proposes
a compact common housing so that multiple modules on feeder side
can have plug-in provision as per required GIS or H-GIS
configuration.
[058] Further advantage of the present invention is that it proposes
a compact common housing with high voltage connection as
required and all modules can be plugged in as per requirement.
[059] Further advantage of the present invention is that it proposes
a compact common housing with a unique modular angled

enclosure for all three phases to achieve necessary phase distance
between gas-to-air bushings in open air.
[060] Yet another advantage of the present invention is that it
proposes a compact common housing having provision for multiple
GIS modules and reduced bay foot print and can be installed as
hybrid GIS in air insulated substations.
[061] Yet another advantage of the present invention is that it
proposes a compact common housing replacing all air insulated
modules in hybrid GIS like surge arrester, potential transformer as
gas insulated modules.

WE CLAIM:
1. A Multi-Module Common Housing for Gas Insulated or Hybrid
Gas insulated Switchgear, comprises of:
- A main enclosure [01] configured with a pair of four-way
connector shells, Switchgear shell or dynamic equipment shell
[01A] and static equipment or termination equipment shell
[01B] connected with a seamless tube [01C] therebetween, for
integrating multiple Gas insulated module depending on
configuration of gas insulated or hybrid gas insulated
switchgear, with terminations made in all orientations
horizontally or vertically,
wherein dynamic equipment shell [01A] is configured
with port I [01D] connected to DS-MES module [02] having an
insulator [02A] and disconnector switch [02B], port II [01E]
connected to FES module [03] having an insulator [03A] and
moving contact assay [03B] and port III [01F] connected to
surge arrester [04] having an insulator [04A],
wherein terminal equipment shell [01B] is configured
with potential transformer port IV [01G] connected to potential
transformer [05] having an insulator [05A] and expansion
chamber [05B] or gas-to-oil bushing [07] having an insulator
[07A] or gas-to-cable termination [08] having an insulator
[08A] or gas insulated bus duct [09] having an insulator [09A]
or moisture absorbent member [13], port V [01H] connected to
[13] or potential Transformer [05] or gas-to-air bushing [06]
through angled enclosures [14] having port IV [01G] connected
to potential transformer [05] therewith,
wherein angled enclosure [14] is configured with angled
conductors [18] to provide required angular orientation of
ports for mounting of terminal bushings at desired angle

ensuring efficient current transfer and with Plug-in terminal
cum shields [19] to make uniform high voltage electric filed,
port VI [01I] connected to [09] or a housing member [13] to
keep moisture absorbents and to keep the gas in the modules
free from moisture;
A pair of spherical connectors, connector - I [15] and connector
- II [16] integrated by a current transfer bridge [17]
therebetween and placed symmetrically inside the multi-
module enclosure [01] in back-to-back configuration, for
facilitating multiple plug-in terminals to integrate different
switchgear modules,
wherein Spherical connector I [15] is facilitated with
fixed contact assembly [03A] of [03] for engaging earthing
switch moving contact assay [03B] from Port II [01E] and is
supported from DS-MES insulator [02A] of [02] and surge
arrester support insulator [04A] of [04],
wherein Spherical connector- II [16] is supported from
PT side insulator [05A] of [05] and gas-to-air bushing side
insulator [06A] of [06] or gas-to-oil bushing side insulator
[07A] of [07] or gas-to-cable termination side insulator [08A]
of [08] or gas insulated bus duct insulator [09A] of [09];
A Hybrid GIS configuration with gas circuit breaker [20],
current transformer [21], bus disconnector switches [22], bus
side maintenance earthing switch [23], Bus-I [24], Bus-II [25];
- A pressure relief valve [10] for protection from high pressures;
- A viewing port [11] for viewing of FES contact position;
- An unit [12] for filling and measuring gas;
- A plurality of dummy cover with or without support insulator
[02A to 09A], for covering a particular module not envisaged
for specified GIS or H-GIS configuration.

2. The Multi-Module Common Housing for Gas Insulated or
Hybrid Gas insulated Switchgear as claimed in claim 1, wherein
it provides eight gas insulated switchgear modules using the
multi-module housing [01] with terminal equipment gas-to-air
bushing [06] at port V [01H], gas-to-cable termination [07] or gas-
to-oil bushing [08] at port IV [01G], gas insulated bus duct [09]
at port IV [01G] or port VI [01I] with potential transformer [05] on
port V [01H] or port IV [01G], Spherical connector II at port IV or
port V respectively having Moisture absorbent envelope [13]
plugged on at port IV [01G] or port V [01H] or port VI [01I] and
three other modules plugged into multi-module housing as DS-
MES [02] on port I[01D], fast acting earthing switch [03] on port
II [01E] and surge arrester [04] on port III [01F].
3. The Multi-Module Common Housing for Gas Insulated or
Hybrid Gas insulated Switchgear as claimed in claim 1, wherein
it configures connection of Gas-to-cable termination [08] module,
wherein the Gas-to-cable termination [08] is connected to port IV
[01G] and potential transformer [05] is connected to port V [01H],
with Spherical connector – II [16] at port IV [01G] supported by
gas-to-cable termination side insulator [08A] of [08] and
Spherical connector – II [16] at port V [01H] supported by
potential transformer side insulator [05A] of [05] through adapter
or expansion chamber [05B] and with DS-MES [02] at port I, FES
[03] at Port II, SA [04] at port III.
4. The Multi-Module Common Housing for Gas Insulated or
Hybrid Gas insulated Switchgear as claimed in claim 1, it

configures connection of Gas-to-Oil Bushing [07] module,
wherein Gas-to-oil bushing [07] is connected to port IV [01G] and
is connected to the power transformer located in cellar /one level
down floor through gas insulated bus duct [09] and potential
transformer [05] is connected to port V [01H], with Spherical
connector – II [16] at port IV [01G] supported by Gas-to-oil
bushing side insulator [07A], and at port V [01H] supported by
potential transformer side insulator [05A] of [05] through adapter
or expansion chamber [05B] and with DS-MES [02] at port I, FES
[03] at Port II, SA [04] at port III.
5. The Multi-Module Common Housing for Gas Insulated or
Hybrid Gas insulated Switchgear as claimed in claim 1, wherein
it configures connection of Gas insulated bus duct [09] module,
wherein the Gas insulated bus duct [09] is connected to port IV
[01G] or port VI [01I] and potential transformer [05] is connected
to port V [01H] or port IV [01G], wherein the gas insulated bus
duct [09] can extend to cellar /one level down floor or through
wall of GIS building to switchyard for further extension to
transformer or reactor, with Spherical connector – II [16] at port
IV [01G] supported by gas insulated bus duct side insulator [09A]
or potential transformer side insulator [05A] of [05] through
adapter or expansion chamber [05B] or alternatively, Spherical
adapter – II [16] at port V [01H] supported by potential
transformer side insulator [05A] or gas insulated bus duct side
insulator [09A], wherein port IV [01G] or port V [01H] or port VI
[01I] is connected to moisture absorbent envelope [13] with DS-
MES [02] at port I, FES [03] at Port II, SA [04] at port III.
6. The Multi-Module Common Housing for Gas Insulated or
Hybrid Gas insulated Switchgear as claimed in claim 1, wherein

it configures connection of Gas to Air Bushing [06] module,
wherein Gas-to-air bushing [06] is connected to port V [01H]
through angled enclosures [14] and potential transformer [05] is
connected to port IV [01G], with Spherical adapter – II [16] at port
V [01H] supported by Gas-to-air bushing side insulator [06A],
and Spherical adapter – II [16] at port IV [01G] supported by
potential transformer side insulator [05A] of [05] through adapter
or expansion chamber [05B] and with DS/MES [02] at port I, FES
[03] at port II, SA [04] at port III.
7. The Multi-Module Common Housing for Gas Insulated or
Hybrid Gas insulated Switchgear as claimed in claim 1 and 6,
wherein the angled enclosure [14] connected to Gas-to-air
bushings [06] maintains modularity in three phases and provides
working clearances for the rated and test voltages.
8. The Multi-Module Common Housing for Gas Insulated or
Hybrid Gas insulated Switchgear as claimed in claim 1, wherein
hybrid gas insulated switchgear comprises of circuit breaker [20],
current transformer [21], bus disconnector switches [22], bus
side maintenance earthing switch [23], wherein feeder
disconnector cum earthing switch [02] is connected for gas
insulated type and surge arrester [04], potential transformer [05]
are of gas insulated type instead of conventional air insulated
type, wherein Gas-to-air bushings [06] extends HT connection
from Bus-I [24], Bus–II [25] and from feeder.
9. The Multi-Module Common Housing for Gas Insulated or
Hybrid Gas insulated Switchgear, as claimed in claim 1,
wherein it provides a single housing for multiple modules on
feeder side of circuit breaker with reduced bay foot print and

having plug-in provision depending on type of GIS or H-GIS bay
configuration eliminating air insulated modules and controlling
gas leakage.