FIELD OF INVENTION:

The present subject matter described herein, relates to a field-fittable auxiliary device for remotely and locally monitoring and controlling the working of contactor and impulse relay. More particularly, the field-fittable auxiliary device monitors the working state i.e. ON/OFF, and operational state i.e. Auto or Manual mode, of the contactor/impulse relay and efficiently produces a controlled 10 output to the contactor/impulse relay to avoid frequent damages.

BACKGROUND AND PRIOR ART:

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 15 invention, or that any publication specifically or implicitly referenced is prior art.
[003] Generally, contactors are electromechanical switches that allow you to start and stop the flow of current in one circuit. A key feature is that the control circuit powering the contactors that are electrically isolated from the circuit(s) being switched, such that the electrically isolated circuits means can switch 20 heavily loaded, high-power circuits with relatively low-power signals and prevent damage from overcurrent or voltage spikes. Specifically, auxiliary devices are used to monitor or control primary switching devices e.g. power indicator lights that tell you if a machine is turned on or not.
[004] Existing contactors were controlled by either alternating voltage (AC) 25 supply using a switch or by using a specially designed relay circuit in case of control through any electronic system. For indication, the user needs to attach another retro-fittable device to them, which makes or breaks the connection as per the working state of attached contactor/impulse relay.
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[005] Therefore, the existing field-fittable devices have a risk of permanent damage to the contactors or impulse relays due to frequent rate of switching. The frequent switching can cause the irretrievable damage to the contactors due to rapid arcing and/or to coil due to over-heating because of large inrush current.
[006] The existing prior art CN204595591U, assigned to STATE GRID FUJIAN 5 ELECTRIC POWER CO LTD, QUANZHOU YIXING ELECTRIC POWER CO LTD, and QUANZHOU POWER INTEGRATED SERVICES COMPANY relates to a take long-range switchgear control system of load detection for remote control and detection load return circuit. The system is used for control the contactor of load return circuit break-make, on-off control device, and a 10 communication device such that the on-off control device passes through communication device realizes remote communication with a host computer, and sets up a hall current sensor in the load return circuit. The control device can be used to the electric current in sensing lead return circuit and feedback to the host computer to this operating condition who judges loading equipment, thus realize 15 load operating condition's remotely monitoring.
[007] To address the above issues a new or improved device has been established to solve the existing problems. The present subject matter discloses a field-fittable auxiliary device for monitoring and controlling remotely and locally the working state and operation mode of the contactor or impulse relay and 20 efficiently producing the controlled output to the contactor or impulse relay to avoid frequent damages. Moreover, the auxiliary device provides a controlled output to coil of contactor by delay in operations to prevent damage to coil due to overheating. It has a local as well as remote visual indications of the working state and operation mode of the switchgear such that the auxiliary device is controlled 25 by AC input supply as well as DC input supply.
[008] The information disclosed in this background of the disclosure section is only for enhancement of understanding of the general background of the invention
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and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
OBJECTS OF THE INVENTION:
[009] The principal objective of the present invention is to provide a field-fittable auxiliary device for monitoring and controlling remotely and locally the 5 working state and operation mode of the contactor/impulse relay.
[0010] Another object of the present invention is to enable monitoring and controlling of contactor/impulse relay with DC or AC voltage supply.
[0011] Yet another object of the present invention is to efficiently produce the controlled output to the contactor/impulse relay to avoid frequent damages due to 10 rapid switching
[0012] Still another object of the present invention is to reduce the toggle frequency of contactor/impulse relay beyond harmful limits which has adverse effects on their life.
[0013] These and other objects and advantages of the present subject matter will 15 be apparent to a person skilled in the art after consideration of the following detailed description taken into consideration with accompanying drawings in which preferred embodiments of the present subject matter are illustrated.
SUMMARY OF THE INVENTION:
[0014] One or more drawbacks of conventional field-fittable auxiliary device, and 20 additional advantages are provided through the auxiliary device as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be a part of the claimed disclosure. 25
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[0015] In an embodiment, the present subject matter relates to a field-fittable auxiliary device which is fitted to contactors or impulse relay for remotely and locally monitoring and controlling their status of operation such that the auxiliary device is electrically isolated from the contactor or impulse relay. The device has a position sensing unit with at least one sensor to detect positions of the working 5 state i.e. ON/OFF, of the switchgear device, and input sensing units which sense the input supply signals i.e., AC input supply and DC input supply and thus provide signal to the processing unit accordingly, and a digital feedback unit that is configured to provide digital feedback signals (F1 and F2). By the processing unit to automated controlling devices like PLC systems and like devices, for 10 remote controlling and monitoring operations.
[0016] Accordingly, the auxiliary device provides the feedback signals (F1 and F2) from the processing unit to the automated controlling devices like PLC systems and like devices, according to the working state and operation status of the switchgear device. Hence, the working state and operation status of the 15 switchgear device is made locally visual by different blinking patterns of the visual indication, by using LED. Therefore, the auxiliary device provides local as well as remote indications to display the working state (ON/OFF) and operation state (Auto/Manual) of the switchgear device removing any confusion about the state of the switchgear device. 20
[0017] In an aspect, the field-fittable auxiliary device is operated by two input source signals like, AC input supply and DC input supply, such that the auxiliary device controls the contactor locally through 230V AC supply and remotely through 24V DC.
[0018] In another embodiment, the present subject matter relates to a method for 25 remotely and locally monitoring and controlling the working of switchgear device. The method comprises the steps of: providing a position sensing unit that includes at least one sensor to detect positions of the working state i.e. ON/OFF, of the switchgear device and input sensing units which sense the input supply signals
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i.e., AC input supply and DC input supply and thus provide signal to the processing unit accordingly, controlling and monitoring the working state of contactor remotely and locally, and monitoring the switching operations mode of the contactor remotely as well as locally. Further, the method involves providing digital feedback signals (F1 and F2) to the automated controlling devices like PLC 5 systems and like devices, by the processing unit via a digital feedback unit, wherein the digital feedback signal (F1) is a reflection of the working state of the switchgear device, and the digital feedback signal (F2) is used for indicating the operations mode of the switchgear device, i.e. Auto mode or Manual mode.
[0019] In an aspect, the auto mode is activated, when the operation is initiated by 10 DC input source signal, and the manual mode is activated, when the operation is initiated by AC input source signal or by manual switching operation of the contactor/impulse relay.
[0020] The device provides a controlled output to switchgear device by delay in operations thereby preventing burning of coil of switchgear device due to frequent 15 switching operations.
[0021] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure. 20
[0022] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS 25
[0023] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be
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considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and 5 components. Some embodiments of system or methods in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0024] Fig. 1 illustrates block diagram view of a field-fittable auxiliary device, in accordance with an embodiment of the present subject matter; 10
[0025] Fig. 2 illustrates diagrammatic view of contactor, in accordance with the present subject matter;
[0026] Fig. 3 illustrates diagrammatic view of Auto and Manual mode in the field-fittable auxiliary device, in accordance with an embodiment of the present subject matter; 15
[0027] Fig. 4 illustrates diagrammatic view of an actuator of field-fittable auxiliary device, in accordance with an embodiment of the present subject matter;
[0028] Fig. 5 illustrates diagrammatic view of contactor and field-fittable auxiliary device, in accordance with an embodiment of the present subject matter;
[0029] Fig. 6 illustrates flow diagram of a method for providing feedback of 20 contactor in a field-fittable auxiliary device, in accordance with the present subject matter; and
[0030] Fig. 7 illustrates controlling actions of field-fittable auxiliary device in presence of different input sources, in accordance with the present subject matter.
[0031] The figures depict embodiments of the present subject matter for the 25 purposes of illustration only. A person skilled in the art will easily recognize from
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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.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0032] While the embodiments of the disclosure are subject to various 5 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. 10
[0033] 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 15 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.
[0034] The present subject matter relates to a field-fittable auxiliary device for remotely and locally monitoring and controlling the working of the 20 contactor/impulse relay.
[0035] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the 25 same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject
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matter. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are 5 believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
[0036] These and other advantages of the present subject matter would be 10 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. 15
[0037] Reference may be made to Figure 1 illustrating block diagram of a field-fittable auxiliary device, in accordance with an embodiment of the present subject matter. The field-fittable auxiliary device 100 has a processing unit 101, a power supply unit 105 that regulates input voltage to stable limits as per requirement, and a position sensing unit 102 that includes at least one sensor to detect the 20 working state (ON/OFF) of switchgear device i.e. contactor 200 or impulse relay, via an actuator 109 which is directly linked to a contactor coil, and input sensing units 103, 104 to sense the input supply signals, i.e. AC input supply and DC input supply and thus provide signal to the processing unit 101 accordingly. Further, the field-fittable auxiliary device 100 includes a digital feedback unit 107 25 that is configured to provide digital feedback signals (F1 and F2) to the automated controlling devices like PLC systems and like devices, by the processing unit 101 via a digital feedback unit 107, and an alternating input unit 103 to sense the presence of alternating input at a terminal C1 and to provide information to the processing unit 101, also a digital input unit 104 to sense digital input signal C0 30
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and to provide the information to the processing unit 101. Hence, the field-fittable auxiliary device 100 consists of various electronics components like, resistors, Opto-couplers networks and etc.
[0038] In accordance with an embodiment of the present subject matter relates to the digital feedback signals (F1) which is a reflection of the working state of the 5 attached switchgear, and the digital feedback signals (F2) can be used for indicating the operation mode of the switchgear i.e., Auto or Manual mode. The auto mode operation is activated when the operation is initiated by the signal source from the digital input unit 104, and the manual mode operation is initiated by either receiving signal source from the alternating input unit 103 or by manual 10 switching operation of the contactor 200.
[0039] Accordingly, the field-fittable auxiliary device 100 further includes a local indication unit 106 i.e., LED, that is utilized for indicating visually the working state and operation mode of the switchgear locally. The local indication unit 106 has different patterns of blinking of light used for local indications on the 15 auxiliary device 100. An output control unit 108 performs the action of controlling the switchgear output according to the control action provided by the processing unit 101 such that the output control unit 108 is generally made of relay which switches the AC supply to the switchgear, and hence controls the state of the attached switchgear. 20
[0040] In accordance with an embodiment of the present subject matter relates to the processing unit 101 consisting of a microcontroller, which takes input from various units and takes action accordingly, such that programming of the microcontroller introduces a time constraint, so that the coil can only be transmitted from one state (open or close) to another after being in that the state 25 for delay time in milliseconds. The device provides controlled output to coil of contactor by delay in operations to prevent damage to coil due to overheating, therefore preventing damages to control the contactor 200 or impulse relay due to frequent switching.
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[0041] Accordingly, the processing unit 101 is differently programmed for the contactor 200 or impulse relay, such that the auxiliary for impulse relay is designed in a manner that it supports bi-stable nature of relays, when given signals it gets activated, with another signal gets deactivated i.e., output of the impulse relay will stay in the “Present state” until another input pulse is applied and the 5 whole sequence will start again. If the auxiliary of switchgear device, the working is of mono stable nature, i.e. it holds a particular state (Open or Close) till the excitation is there, and it returns back to the stable state, as soon as the excitation dies.
[0042] Reference may be made to Figure 2 illustrating diagrammatic view of 10 contactor, in accordance with the present subject matter. The field-fittable auxiliary device 100 is electrically isolated from the contactor 200. The auxiliary device 100 monitors the switching operations of the contactor 200 remotely as well as locally, such that the auxiliary device 100 controls the contactor 200 locally via 230V AC supply and remotely via 24V DC. 15
[0043] Referring figure 3 illustrating diagrammatic view of input units, i.e. AC input unit and DC input unit to sense the operation i.e. auto and manual, of contactor in the field-fittable auxiliary device, in accordance with an embodiment of the present subject matter. The sensor 109 detects the state of the operations i.e., Auto or Manual, such that if the Auto state, the auxiliary device 100 controls 20 the switchgear device i.e. contactor 200 or impulse relay, remotely through any automated controlling system while the Manual state is controlled through an AC signal input at 230V AC, and if the manual state the auxiliary device 100 controls the contactor 200 either controlled remotely through 230V AC or manually override. 25
[0044] Referring figure 4 illustrating diagrammatic view of an actuator to sense the working state (ON/OFF) of the retrofitted switchgear device, in accordance with an embodiment of the present subject matter. The actuator position is linked with the plurality of sensor(s), which checks the position of the coil of attached
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switchgear, and provides corresponding input signal to the control unit. It provides the knowledge of the working state of switchgear, remaining electrically isolated from the switchgear switching supply.
[0045] Reference may be made to Figure 5 illustrating a diagrammatic view of contactor and field-fittable auxiliary device, in accordance with an embodiment of 5 the present subject matter. The field-fittable auxiliary device 100 is electrically isolated from the switchgear device and has provision of mounting additional auxiliary on the existing contactor auxiliary.
[0046] Reference may be made to Figure 6 illustrating flow diagram of a method for providing feedback of contactor in a field-fittable auxiliary device, in 10 accordance with an embodiment of the present subject matter. The method involves providing a position sensing unit 102 that includes at least one sensor to detect the working state (ON/OFF) of the switchgear device, via an actuator 109 which is directly linked to the contactor coil and input sensing units 103, 104 sense the input supply signals, i.e. AC input supply and DC input supply and thus 15 provide signal to the processing unit 101 accordingly, controlling and monitoring the working state of switchgear device remotely and locally, and monitoring the switching operations mode of the switchgear device remotely as well as locally. Further, the method involves providing digital feedback signals (F1 and F2) to the automated controlling devices like PLC systems and like devices, by the 20 processing unit 101 via a digital feedback unit 107, wherein the digital feedback signal (F1) is a reflection of the working state of the switchgear, and the digital feedback signal (F2) is used for indicating the operations mode of the switchgear, i.e. Auto mode or Manual mode.
[0047] Accordingly, the auto mode is activated, when the operation is initiated by 25 DC input source signal, and the manual mode is activated, when the operation is initiated by AC input source signal or by manual switching operation of the switchgear device.
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[0048] Reference may be made to Figure 7 illustrating time diagram of AC and DC control input signals, in accordance with an embodiment of the present subject matter. The contactor coil is actuated when one of the input sensing units 103, 104 of the auxiliary device starts sensing, i.e. AC or DC input signal. It will trigger OFF when it senses a trailing edge of the same input signal with which it started 5 sensing. The device has a lag time of 500ms for which it does not senses anything, after it has triggered OFF. And after the lag time, it will again work like same as defined above. In case when both the inputs are sensed one after another and the first input signal is triggered OFF in the presence of second input signal, the contactor will trigger OFF as the input signal with which it was ON is triggered 10 OFF, and again it will be ON after a lag of 500ms when the sensors starts sensing at the input sensing units103, 104 of the auxiliary device 100.
[0049] Advantages of the present subject matter, the field-fittable device enables monitoring and controlling the contactor or impulse relay with DC or AC voltage supply. Moreover, the auxiliary device has a circuitry which prevents frequent 15 multiple switching operations of the controlled devices beyond a safe limit. Hence the rate of switching can be limited to that advised under IS/IEC regulatory standards.
[0050] 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 20 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 25 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 30
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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 5 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 10 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 15 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, 20 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 25 both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
[0051] 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 30
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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 5 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 10 practice of the methods herein. The use of “comprising” or “including” also contemplates embodiments that “consist essentially of” or “consist of” the recited feature.
[0052] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present 15 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 system/component 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 20 which fall within the scope of the present subject matter.

We claim:

1. A field-fittable auxiliary device (100) for remotely and locally monitoring and controlling the working of switchgear devices like contactor/impulse relay, the field-fittable auxiliary device (100) comprising:
a processing unit (101); 5
a position sensing unit (102) having at least one sensor to detect positions of the working state of switchgear device and input sensing units (103, 104) which sense input supply signals and providing signal to the processing unit (101);
a power supply unit (105) configured to regulate input voltage to 10 stable limits as per requirement and to supply the input voltage to the processing unit (101);
a local indication unit (106) configured to indicate different patterns for different operating states of switchgear device; and
a digital feedback unit (107) providing digital feedback signals (F1 15 and F2) to the processing unit;
characterized in that
the digital feedback signal (F1) is a reflection of the working state of the switchgear device, and the digital feedback signal (F2) is used for indicating an operation mode of the switchgear device; 20
wherein the processing unit (101) is connected with controlling devices like, PLC systems and like devices, to monitor and control remotely operations.
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wherein the auxiliary device (100) provides controlled output to switchgear device by delay in operations to prevent damage to switchgear device due to overheating.
2. The field-fittable auxiliary device (100) as claimed in claim 1, wherein the input source signals are AC input supply and DC input supply. 5
3. The field-fittable auxiliary device (100) as claimed in claim 1, wherein the field-fittable auxiliary device (100) controls the switchgear device locally through 230V AC supply and remotely through 24V DC.
4. The field-fittable auxiliary device (100) as claimed in claim 1, wherein operation modes of the switchgear device are auto mode or manual mode. 10
5. The field-fittable auxiliary device (100) as claimed in claim 1, wherein the auto mode is activated, when the operation is initiated by DC input source signal, and the manual mode is activated, when the operation is initiated by AC input source signal or by manual switching operations of the switchgear device. 15
6. The field-fittable auxiliary device (100) as claimed in claim 1, wherein the working state of switchgear device is ON or OFF.
7. The field-fittable auxiliary device (100) as claimed in claim 6, wherein the OFF sate of the switchgear device is indicated by 100 ms pulse in every 5s.
8. The field-fittable auxiliary device (100) as claimed in claim 6, wherein the 20 ON state of the switchgear device is indicated by different blinking patterns of LED, which is mounted on the auxiliary device (100), or different input sources in the auxiliary device (100).
9. The field-fittable auxiliary device (100) as claimed in claim 1, wherein the field-fittable auxiliary device (100) is electrically isolated from the 25 switchgear device.
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10. The field-fittable auxiliary device (100) as claimed in claim1, wherein the auxiliary device (100) provides controlled output to switchgear device after a delay time of 500 ms.
11. A method for remotely and locally monitoring and controlling the working of switchgear device in a field-fittable auxiliary device (100); the method 5 comprising the steps of:
providing a position sensing unit (102) having at least one sensor to detect positions of the working state of switchgear device and input sensing units which sense input supply signals and providing signal to a processing unit (101); 10
controlling the working state of switchgear device remotely and locally;
monitoring the switching operations mode of switchgear device remotely and locally; and
providing digital feedback signals (F1 and F2) to the processing unit 15 by a digital feedbacks unit (107);
wherein the digital feedback signal (F1) is a reflection of the working state of the switchgear device, and the digital feedback signal (F2) is used for indicating the operations mode of the switchgear device, i.e. Auto mode or Manual mode. 20
wherein the processing unit (101) is connected with controlling devices like, PLC systems and like devices, to monitor and control remotely operations.
wherein the auxiliary device (100) provides controlled output to Switchgear device by delay in operations to prevent damage to Switchgear 25 device due to overheating.
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12. The method as claimed in claim 11, wherein the working state of the switchgear device defines as ON or OFF state.
13. The method as claimed in claim 11, wherein the OFF state of the switchgear device is indicated by 100 ms pulse in every 5s.
14. The method as claimed in claim 11, wherein the ON state of the switchgear 5 device is indicated by different blinking patterns of LED, which is mounted on the auxiliary device (100), or different input sources in the auxiliary device (100).
15. The method as claimed in claim 11, wherein the auto mode is activated, when the operation is initiated by DC input source signal, and the manual 10 mode is activated, when the operation is initiated by AC input source signal or by manual switching operation of the switchgear device.
16. The method as claimed in claim 11, wherein the auxiliary device (100) provides controlled output to switchgear device after a delay time of 500 ms.