The present disclosure relates to the field of current transformer
contact arrangement. More particularly the present disclosure relates to contact assembly for current transformer for draw-out type relay.
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] A relay is an electrical switch with electromagnet or solid-state
devices along with required logic inbuilt to operate the main switch for an
intended function. In protective relay, relay device designed to trip a circuit
breaker when it detects an abnormal operating condition such as over-current,
over-voltage, reverse power flow, over-frequency, and under-frequency fault is
detected. The feeder protection relays are widely used at the feeder levels in
electrical circuit for monitoring the effective functioning of feeder. For making
Feeder protection relay maintenance supportive draw-out type is made.
[0004] In case of draw-out type relays, the contact system is design to
carry high currents from current transformer and has a feature to short the CT
terminals even during the disconnect position. The draw-out type relay includes a
fixed frame and a removable relay. Fixed frame has different fixed contacts (CT,
DIO, connectors etc.) which will make contact with moving relay when inserted
and provide supply. Each time when relay is removed the contact will disengage
but there is a requirement of CT terminals to remain closed or CT secondary
terminal should never be kept open. Hence to protect CT terminals, secondary of
CT should always be shorted to avoid any electrical damage.
[0005] There is, therefore, a need of a contact assembly that make sure
that the secondary of the current transform is always shorted irrespective of the position of the draw-out type relay.

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 CT contact
assembly for draw-out type relay, which is easy to use.
[0008] It is an object of the present disclosure to provide a CT contact
assembly for draw-out type relay, which is efficient.
[0009] It is an object of the present disclosure to provide a CT contact
assembly for draw-out type relay, which is cost effective.
[0010] It is an object of the present disclosure to provide a CT contact
assembly for draw-out type relay, which requires less maintenance cost.
[0011] It is an object of the present disclosure to provide a CT contact
assembly for draw-out type relay, which has integrated IP covers thereby,
protecting any person coming in contact with live components.
[0012] In an aspect, Relay contact assembly also has a provision of
mounting Micro switch to provide contacts status display.
SUMMARY
[0013] The present disclosure relates to the field of current transformer
contact arrangement. More particularly the present disclosure relates to contact assembly for current transformer for draw-out type relay.
[0014] An aspect of the present disclosure pertains to a current
transformed (CT) contact assembly for a relay. The CT contact assembly includes a first section electrically configured with secondary terminals (first secondary terminal and second secondary terminal) of the current transformer. The stationary section includes a first conducting member having a first end electrically coupled with a first secondary terminal, a second conducting member having a third end electrically coupled with a second secondary terminal. A second end of the first conducting member and the fourth end of the second conducting member are separated from each other by a gap. A shorting member elastically configured with the first conducting member and the second conducting member to facilitate

shorting of a second end of the first conducting member and a fourth end of the
second conducting member.
[0015] In an aspect, the CT contact assembly may comprise a second
section movably electrically coupled with the relay, and the second section is
configured to move between a first position and a second position corresponding
to a draw-in and draw-out operation of the relay.
[0016] In an aspect, the second section may comprise a protrusion
configured to slide through the gap, while the second section is moved from the
first position to the second position corresponding to draw-in operation of the
relay, facilitating disengagement of the shorting member from the second end and
the fourth end.
[0017] In an aspect, the second section may comprise a third conductive
member adapted to be electrically coupled to the first conducting member while
the protrusion slides in through the gap corresponding to a draw-in operation of
the relay, and a fourth conducting member adapted to be electrically coupled to
the first conducting member while the protrusion slides in through the gap
corresponding to draw-in operation of the relay.
[0018] In an aspect, the shorting plate may be disengaged from the second
end the fourth end after the third conducting member is electrically coupled with
the first conductive member and the fourth conducting member is electrically
coupled with the second conductive member.
[0019] In an aspect, the shorting plate may be configured to re-engage
with the second end the fourth end while the protrusion is slides out of the gap
while the second section is moved from the second position to the first position
corresponding to a draw-out operation of the relay.
[0020] In an aspect, the third conductive member may be electrically
decoupled from the first conductive member and the fourth conductive member is
electrically decoupled from the second conductive member after the shorting plate
is re-engaged with the second end and the fourth end.
[0021] In an aspect, the CT contact assembly may be in a shape of cassette
having integrated IP covers.

[0022] 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
[0023] 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.
[0024] 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.
[0025] FIG. 1A-1B illustrates exemplary representation of contact
assembly for a draw-out type relay, in accordance with an embodiment of the
present disclosure.
[0026] FIG. 2A illustrates exemplary representation of a top view of the
first section, in accordance with an embodiment of the present disclosure.
[0027] FIG. 2B illustrates exemplary representation of a top view of the
first section, in accordance with an embodiment of the present disclosure.
[0028] FIG. 3A-3C illustrates exemplary representation of engaging the
first section and the second section, in accordance with an embodiment of the
present disclosure.

[0029] FIG. 4A-4C illustrates exemplary representation of disengaging the
first section and the second section, in accordance with an embodiment of the present disclosure.
[0030] FIG. 5 illustrates an exemplary representation of the second section
with a micro switch, in accordance with an embodiment of the present disclosure.
DETAILED DESCRIPTION
[0031] 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.
[0032] 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.
[0033] The present disclosure relates to the field of current transformer
contact arrangement. More particularly the present disclosure relates to contact
assembly for current transformer for draw-out type relay.
[0034] FIG. 1A-1B illustrates exemplary representation of contact
assembly for a draw-out type relay, in accordance with an embodiment of the
present disclosure.
[0035] FIG. 2A illustrates exemplary representation of a top view of the
first section, in accordance with an embodiment of the present disclosure.
[0036] FIG. 2B illustrates exemplary representation of a top view of the
first section, in accordance with an embodiment of the present disclosure.
[0037] As illustrated, a current transformed (CT) contact assembly 100 for
a relay can include a first section 102 electrically configured with secondary
terminals i.e. first secondary terminal and second secondary terminal (not shown)

of the current transformer (not shown). The first section 102 can be a stationary
section 102 that can include a first conducting member 104 and a second
conductive member 106. The first conductive member 104 can include a first end
104-1 can be electrically coupled with the first secondary terminal. The second
conducting member 106 can include a third end 106-1 that can be electrically
coupled with a second secondary terminal. A second end 104-2 of the first
conducting member 104 and a fourth end 106-2 of the second conducting member
106 can be separated from each other by a gap. A shorting member 108 can be
elastically configured, through a spring 118, with the first conducting member 104
and the second conducting member 106. The shorting member 108 can facilitate
electrically shorting of a second end 104-2 of the first conducting member 104
and the fourth end 106-2 of the second conducting member 106.
[0038] In an embodiment, the CT contact assembly 100 can include a
second section 110 that can be electrically coupled with the relay. The second
section 110 can be configured to move between a first position and a second
position corresponding to a draw-in and draw-out operation of the relay. When the
second section 110 is in the first position the section 110 can be disengaged from
the first section 102, and when the second section is at the second position the
second section 108 can be engaged with the first section 102.
[0039] In an embodiment, the second section 110 can include a protrusion
112 that can be configured to slide through the gap, while the second section 110 is moved from the first position to the second position corresponding to draw-in operation of the relay. This can facilitate disengagement of the shorting member/plate 108 from the second end 104-2 and the fourth end 106-2. The second section 110 can include a third conductive member 114 adapted to be electrically coupled to the first conducting member 104 while the protrusion 112 slides in through the gap corresponding to a draw-in operation of the relay. A fourth conducting member 116 adapted to be electrically coupled to the second conducting member 106 while the protrusion 112 slides in through the gap corresponding to draw-in operation of the relay.

[0040] FIG. 3A-3C illustrates exemplary representation of engaging the
first section and the second section, in accordance with an embodiment of the present disclosure.
[0041] In an embodiment, the shorting plate 108 can be disengaged from
the second end 104-2 and the fourth end 106-2 after the third conducting member
114 is electrically coupled with the first conductive member 104 and the fourth
conducting member 116 is electrically coupled with the second conductive
member 106. The shorting plate 108 can be configured to re-engage with the
second end 104-2 and the fourth end 106-2 while the protrusion 112 slides out of
the gap while the second section 110 is moved from the second position to the
first position corresponding to a draw-out operation of the relay.
[0042] FIG. 4A-4C illustrates exemplary representation of disengaging the
first section and the second section, in accordance with an embodiment of the present disclosure.
[0043] FIG. 5 illustrates an exemplary representation of the second section
with a micro switch, in accordance with an embodiment of the present disclosure.
[0044] In an embodiment, the third conductive member 114 can be
electrically decoupled from the first conductive member 104 and the fourth
conductive member 116 can be electrically decoupled from the second conductive
member 106 after the shorting plate 108 is re-engaged with the second end 104-2
and the fourth end 106-2. The CT contact assembly can be in a shape of cassette
having integrated IP covers so as to protect a user from coming in contact with
live components inside the CT contact assembly 100. The IP covers are made as
integral part of cassette hence avoiding the chance of misplacing and operating
without IP protection. Each CT contact cassettes frame i.e. rear draw-out base is
designed for full IP protection both in plug in and draw-out condition.
[0045] As illustrated in FIG. 5, the second section 110 can include a
microswitch 502 to provide signals regarding status of contact engagement. Each CT contact cassettes in frame i.e. rear draw-out base is designed for full IP protection both in external terminals and from internal parts in draw out state. In the present invention by removing the shorting provision the same CT contacts

shall act as normal input output contacts. The second section 110 can include a relay contact holder 504, an actuator profile 506 and a moving contacts 508. Series of moving contacts 508 can be mounted on the slots of relay contact holder 504. The FIG. 5 also illustrates relay wires 510 soldered at rear end of the second section 110.
[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 CT contact assembly for draw-
out type relay, which is easy to use.
[0049] The proposed invention provides a CT contact assembly for draw-
out type relay, which is efficient.
[0050] The proposed invention provides a CT contact assembly for draw-
out type relay, which is cost effective.

[0051] The proposed invention provides a CT contact assembly for draw-
out type relay, which requires less maintenance cost.
[0052] The proposed invention provides a CT contact assembly for draw-
out type relay, which has integrated IP covers thereby, protecting any person coming in contact with live components.
[0053] The proposed invention provides a CT contact assembly for draw-
out type relay, which houses a Micro Switch to provide signals regarding status of contact engagement.

We Claim:

1. A current transformed (CT) contact assembly for a relay, the CT contact
assembly comprising:
a first section electrically configured with secondary terminals of the current transformer, the stationary section comprising:
a first conducting member having a first end electrically coupled with a first secondary terminal, a second conducting member having a third end electrically coupled with a second secondary terminal, wherein a second end of the first conducting member and the fourth end of the second conducting member are separated from each other by a gap;
a shorting member elastically configured with the first conducting member and the second conducting member to facilitate shorting of a second end of the first conducting member and a fourth end of the second conducting member.
2. The CT contact assembly as claimed in claim 1, wherein the CT contact assembly comprises a second section movably electrically coupled with the relay, and the second section is configured to move between a first position and a second position corresponding to a draw-in and draw-out operation of the relay.
3. The CT contact assembly as claimed in claim 2, wherein the second section comprises a protrusion configured to slide through the gap, while the second section is moved from the first position to the second position corresponding to draw-in operation of the relay, facilitating disengagement of the shorting member from the second end and the fourth end.
4. The CT contact assembly as claimed in claim 3, wherein the second section comprises a third conductive member adapted to be electrically coupled to the first conducting member while the protrusion slides in through the gap corresponding to a draw-in operation of the relay, and a fourth conducting member adapted to be electrically coupled to the first

conducting member while the protrusion slides in through the gap corresponding to draw-in operation of the relay.
5. The CT contact assembly as claimed in claim 3, wherein the shorting plate is disengaged from the second end the fourth end after the third conducting member is electrically coupled with the first conductive member and the fourth conducting member is electrically coupled with the second conductive member.
6. The CT contact assembly as claimed in claim 3, wherein the shorting plate is configured to re-engage with the second end the fourth end while the protrusion is slides out of the gap while the second section is moved from the second position to the first position corresponding to a draw-out operation of the relay.
7. The CT contact assembly as claimed in claim 6, wherein the third conductive member is electrically decoupled from the first conductive member and the fourth conductive member is electrically decoupled from the second conductive member after the shorting plate is re-engaged with the second end and the fourth end.
8. The CT contact assembly as claimed in claim 1, wherein the CT contact assembly is in a shape of cassette having integrated IP covers.
9. The CT contact assembly as claimed in claim 1, wherein the CT contact assembly houses micro switch for providing contact engagement status.