The present disclosure relates to the field of switchgear. More
particularly the present disclosure relates to metallic shutter pate assembly for voltage circuit breaker of 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] Medium voltage & high voltage switchgear having drawn out type
voltage circuit breaker (VCB) or PT consists of safety shutters which closes or blocks the access to live conductor. These Conductor in VCB compartment are not earthed or switched off many times & remains on during maintenance and the personnel working in compartment may not know the current status of voltage on these conductors. This will pose a threat safety to personnel working in VCB compartment.
[0004] There is, therefore, a need of an improved safety shutter that can
indicate presence of voltage to a person who is working on the VCB.
OBJECTS OF THE PRESENT DISCLOSURE
[0005] Some of the objects of the present disclosure, which at least one
embodiment herein satisfies are as listed herein below.
[0006] It is an object of the present disclosure to provide a shutter
assembly for VCB, which indicate presence of voltage in the VCB conductors.
[0007] It is an object of the present disclosure to provide a shutter
assembly for VCB, which is cost effective.
[0008] It is an object of the present disclosure to provide a shutter
assembly for VCB, which is efficient.
[0009] It is an object of the present disclosure to provide a shutter
assembly for VCB, which is easy to use and requires less maintenance.

[0010] It is an object of the present disclosure to provide a shutter
assembly for VCB, which include passive voltage indicator which will change
color if voltage is present in conductor and gives a visual indication.
[0011] It is an object of the present disclosure to provide a shutter
assembly for VCB, which requires no additional power source for detection of
voltage in conductors.
[0012] It is an object of the present disclosure to provide a shutter
assembly for VCB, which is backward compatible and can be used with the
existing switchgears with small or no modification.
[0013] It is an object of the present disclosure to provide a shutter
assembly for VCB, which eliminates any risk of electric shock to a person doing
maintenance work.
SUMMARY
[0014] The present disclosure relates to the field of switchgear. More
particularly the present disclosure relates to metallic shutter pate assembly for
voltage circuit breaker of the switchgear.
[0015] An aspect of the present disclosure pertains to a safety shutter
assembly adapted to be configured with switchgear. The assembly incudes a pair
of rods having guide ways. One or more shutter plates slidably configured over
the pair of rods and configured to slide, when voltage circuit breaker of the switch
gear is racked out, through the guide ways. One or more patches configured over
the one or more shutter plates, and are facing conductors of the voltage circuit
breaker, and the one or more patches comprises electrochromic materials for all
phases.
[0016] In an aspect, a colour of the one or more patches may change when
the one or more conductors have a voltage.
[0017] In an aspect, the one or more patches may restore to their original
colour when the voltage is switched off.
[0018] In an aspect, the one or more conductors may comprise a busbar
side conductors and cable side conductors.

[0019] In an aspect, the one or more shutter plates may comprise a first
shutter plate for the busbar side conductors, and a second shutter plate for cable
side conductors.
[0020] In an aspect, the electrochromic material may comprise any or
combination of tungsten trioxide (W03), Molybdenum trioxide (Mo03), and
liquid polymer display film (LPD).
[0021] 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
[0022] 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.
[0023] 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.
[0024] FIG. 1A illustrates exemplary representation of a safety shutter
assembly for VCB, in accordance with an embodiment of the present disclosure.
[0025] FIG. IB illustrates exemplary representation of one or more
patches when voltage is detected in conductor, 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 metallic shutter pate assembly for
voltage circuit breaker of the switchgear.
[0029] The present disclosure elaborates upon a safety shutter assembly
adapted to be configured with switchgear. The assembly incudes a pair of rods
having guide ways. One or more shutter plates slidably configured over the pair of
rods and configured to slide, when voltage circuit breaker of the switch gear is
racked out, through the guide ways. One or more patches configured over the one
or more shutter plates, and are facing conductors of the voltage circuit breaker,
and the one or more patches comprises electrochromic materials for all phases.
[0030] In an embodiment, a colour of the one or more patches can change
when the one or more conductors have a voltage.
[0031] In an embodiment, the one or more patches can restore to their
original colour when the voltage is switched off.
[0032] In an embodiment, the one or more conductors can comprise a
busbar side conductors and cable side conductors.
[0033] In an embodiment, the one or more shutter plates can comprise a
first shutter plate for the busbar side conductors, and a second shutter plate for
cable side conductors.

[0034] In an embodiment, the electrochromic material can comprise any
or combination of tungsten trioxide (W03), Molybdenum trioxide (Mo03), and liquid polymer display film (LPD).
[0035] FIG. 1A illustrates exemplary representation of a safety shutter
assembly for VCB, in accordance with an embodiment of the present disclosure.
[0036] FIG. IB illustrates exemplary representation of one or more
patches when voltage is detected in conductor, in accordance with an embodiment of the present disclosure.
[0037] As illustrated, a metallic shutter assembly 100 adapted to be
configured with switchgear can include a pair of rods 102 having guide ways 108.
One or more shutter plates 104-1, 104-2 (collectively referred as 104) can be
slidably configured over the pair of rods 102. The one or more shutter plates can
be configured to slide over the guide ways when voltage circuit breaker of the
switch gear is racked out of the switchgear. One or more patches 106 can be
configured over the one or more shutter plates 104, The one or more patches can
face one or more conductors 108 of the voltage circuit breaker.
[0038] In an embodiment, the one or more patches 106 can include
electrochromic materials for all phases (Red, Yellow, Green). The electrochromic
material can include any or combination of tungsten trioxide (W03), and
Molybdenum trioxide (Mo03). A colour of the one or more patches can change
(as shown in FIG. IB) from white or transparent to red when the one or more
conductors have a voltage. This can indicate a worker, who is doing some
maintenance work, about voltage level of the one or more conductors so that the
worker can take necessary measures to avoid any accident. The one or more
patches can restore to their original colour when the voltage is switched off.
[0039] In an embodiment, the one or more conductors 108 can include a
busbar side conductors and cable side conductors. The one or more shutter plates 104 can comprise a first shutter plate 104-1 for the busbar side conductors, and a second shutter plate 104-2 for cable side conductors. A presence of voltage is detected by a special color changing material (one or more patches) present on the one or more metallic shutter plates 104. On knowing the presence of voltage

source in VCB Compartment the personnel or worker can become extra conscious and have confirm knowledge of hazard near him, which enables him/her to act accordingly to ensure his safety or switch off the supply.
[0040] In an embodiment, change of color in electro-chromatic material is
caused by change in internal electric domain alignment in material, on removal of electric field, electric domains get realigned and reverts back to its original color. These color changes are reversible type and on removal of field the color of material restores to normal. Small patches or portion of electro chromatic material are mounted or pasted on metallic shutter plate 104 facing the live conductor. These small patches of special material will change color to Red (or other predetermined depending on material characteristic) on presence of voltage in conductor and restores to normal white/transparent color when voltage is switched off.
[0041] 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.
[0042] 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
[0043] The proposed invention provides a shutter assembly for VCB,
which indicate presence of voltage in the VCB conductors.
[0044] The proposed invention provides a shutter assembly for VCB,
which is cost effective.
[0045] The proposed invention provides a shutter assembly for VCB,
which is efficient.
[0046] The proposed invention provides a shutter assembly for VCB,
which is easy to use and requires less maintenance.
[0047] The proposed invention provides a shutter assembly for VCB,
which include passive voltage indicator which will change color if voltage is
present in conductor and gives a visual indication.
[0048] The proposed invention provides a shutter assembly for VCB,
which requires no additional power source for detection of voltage in conductors.
[0049] The proposed invention provides a shutter assembly for VCB,
which is backward compatible and can be used with the existing switchgears with
small or no modification.
[0050] The proposed invention provides a shutter assembly for VCB,
which eliminates any risk of electric shock to a person doing maintenance work.

We Claim:

1. A safety shutter assembly adapted to be configured with switchgear, the
assembly comprising:
a pair of rods having guide ways;
one or more shutter plates slidably configured over the pair of rods and configured to slide, when voltage circuit breaker of the switch gear is racked out, through the guide ways;
one or more patches configured over the one or more shutter plates, and are facing conductors of the voltage circuit breaker, wherein the one or more patches comprises electrochromic materials for all phases.
2. The safety shutter assembly as claimed in claim 1, wherein a colour of the one or more patches changes when the one or more conductors have a voltage.
3. The safety shutter assembly as claimed in claim 1, wherein the one or more patches restore to original colour when the voltage is switched off.
4. The safety shutter assembly as claimed in claim 1, wherein the one or more conductors comprises a busbar side conductors and cable side conductors.
5. The safety shutter assembly as claimed in claim 1, wherein the one or more shutter plates comprise a first shutter plate for the busbar side conductors, and a second shutter plate for cable side conductors.
6. The safety shutter assembly as claimed in claim 1, wherein the electrochromic material comprises any or combination of tungsten trioxide (W03), Molybdenum trioxide ( Mo03), and liquid polymer display film (LPD).