FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A multifunctional improvised electronic system for performing interlock operations
APPLICANTS
Crompton Greaves Limited, CG House, 6th House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company.
INVENTOR
Karlekar Sanket of Crompton Greaves Ltd, Switchgear (S2) Division, Switchgear Complex, Ambad Nashik, Maharashtra, India; an Indian National.
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

Field of the Invention:
The invention relates to the field of control systems in electrical, electronic, mechanical, and electromechanical applications.
Particularly, this invention relates to a multifunctional improvised electronic device for performing interlock operations of a Medium voltage circuit breaker.
Background of the Invention:
All types of industries, in the entire operating range from electronics to electrical to mechanical to electromechanical to robotic to biomedical rely on a plurality of equipment in their assembly line. Some of the basic equipment from said plurality of equipment includes switchgear assemblies, transformers, and the like.
Each equipment relies on the power input provided to it and on the output expected from it. The internal working of such equipment is, thus, tweaked to handle the input / output ratio. Depending on the jurisdiction in which it is installed, the input power supply may differ. The Original Equipment Manufacturer (OEM), may then, provide adaptive functions and technologies to handle the range according to the available specifications. However, it is the duty of the engineers at the installation site to specifically put in monitoring equipment in place in order to deal with aberrations. A form of such equipment includes circuit breakers depending upon voltage or current characteristics. Overshoot or undersupply in them can cause the circuit breaker to disengage the functionalities of the equipment it is adapted to monitor.

Some of the electronic instruments required for a typical medium voltage switchgear include TNC switch, LR switch, TCH Push Button, indicating lamps, meters (V,I,PF,KW,KVA,KVAR), Master Trip relay, TCH relay, Antipuwping device, operation counter, annunciator, 3-Phase Over Voltage Relay, 3-Phase Under Voltage Relay, and the like.
It is certain that in a fairly large set-up, a distributed power requirement is summoned. Managing this distributed power supply is a huge task involving diligent planning, appropriate positioning of sensors and breakers, and massive wiring.
There is a need for a universal monitoring assembly.
Objects of the Invention:
An object of the invention is to provide a central and universal interlock operator for a plurality of assemblies, equipment, machines of medium voltage switch gear.
Another object of the invention is to reduce the amount of manual labour and wiring involved in providing a safety mechanism such as an interlock mechanism

Summary of the Invention:
For the purposes of this specification, 'interlock' means to include the avoidance of undesirable states of a machine, an equipment as defined in the background, or any such assemblies.
According to this invention, there is provided a multifunctional improvised electronic system for performing and monitoring interlock operations of a breaker assembly having a set of relay, tripping coil, and closing coil, said system comprises:
a. fault defining means in relation to associated said relays connected to
device via fault inputs, adapted to define thresholds of fault conditions;
b. trip control means adapted to provide tripping control in relation to said
relays upon detection or breach of said defined thresholds of fault
conditions;
c. Current Transformer value defining means adapted to define Current
Transformer Primary and Secondary Ratio values;
d. Voltage Transformer value defining means adapted to define Voltage
Transformer Primary and Secondary Ratio values;
e. over-voltage parameter defining means adapted to define over-voltage
parameters;
f. under-voltage parameter defining means adapted to define under-voltage
parameters;
g. first control and monitoring means adapted to control and monitor closing
coil and tripping coil along with master trip relay based on at least one
value from said Current Transformer Primary and Secondary Ratio value,

said Voltage Transformer Primary and Secondary Ratio value, said defined over-voltage parameters, said defined under-voltage parameters;
h. second control and monitoring means adapted to digitally control and monitor devices such as antipumping device based on simultaneous trigger of said tripping coil and said closing coil, for preventing simultaneous operation of said tripping coil and said closing coil;
i. third control and monitoring means adapted to digitally control and monitor trip circuit based on the trip coil which is connected to the device, by monitoring the complete circuit in order to determine the health status of said trip circuit;
j. fourth control and monitoring means adapted to functions as a master trip relay adapted to be used as an auxiliary device for trip circuit;
k. switching means adapted to digitally switch said interlock operations from a local mode to a remote mode or from a remote mode to a local mode;
1. display and alarm means which includes text display means, audio annuciators, visual annunciators, or any combination thereof adapted to digitally display a plurality of rating parameters selected from current working parameters, voltage rating parameters, threshold working parameters, breach of working parameters, user-defined parameters, Trip circuit health, Phase healthy, VCB ON, VCB OFF, spring charge, local / remote mode of operation, test, service, different fault indications in digital format, voltage meter, current meter, KVA meter, KVAR meter, KW meter, PF meter; and m. means to control said circuit breaker based on at least one value from said Current Transformer Primary and Secondary Ratio value, said Voltage Transformer Primary and Secondary Ratio value, said defined over-voltage parameters, said defined under-voltage parameters.

Typically, said display means includes a Fault Allocation display means adapted to display various fault inputs in relation to the various relays.
Typically, said display means includes a Trip Allocation display means adapted to display associating Breaker Trip condition to various fault inputs.
Typically, said display means includes a CT Ratio Setting display means adapted to display CT Primary and Secondary Ratio values.
Preferably, said system includes a CT Ratio Setting input means adapted to input CT Primary and Secondary Ratio values.
Typically, said display means includes a VT Ratio Setting display means adapted to display VT Primary and Secondary Ratios.
Preferably, said system includes a VT Ratio Setting input means adapted to input VT Primary and Secondary Ratio values.
Typically, said display means includes an Over Voltage Setting display adapted to which will be used for Enabling over Voltage Relay Parameters.
Typically, said system includes a Under Voltage Setting means adapted to enable under Voltage Relay Parameters

Typically, said system includes a Under Voltage Setting display means adapted to display Under Voltage Settings which will be used for Enabling under Voltage Relay Parameters.
Typically, said system includes a selection means adapted to select at least one function from the plurality of functions that said device is adapted to cater.
Typically, said fault defining means includes means to define fault for any combination of relays which can be selected for any type of fault.
Typically, said fault defining means includes means to prioritize faults for providing action.
Typically, said system includes password protection means adapted to allow only an authorized personnel to modify or regulate the values or operative parameters of said device.
Typically, said system includes operation counter adapted to count the number of trip-close operations that the circuit breaker has performed, so that an automated service log may be created for requesting servicing of circuit breaker
Brief Description of the Accompanying Drawings:
The invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a schematic of the system.

Detailed Description of the Accompanying Drawings:
According to this invention, there is provided a multifunctional improvised electronic system (100) for performing and monitoring interlock operations of a breaker assembly (10) having a set of relay, tripping coil, and closing coil,.
Figure 1 illustrates a schematic of the system (100).
In accordance with one embodiment of this invention, there is provided a selection means adapted to select at least one function from the plurality of functions that said device is adapted to cater. Said plurality of functions include working conditions such as fault inputs, relay outputs, trip conditions, closing conditions, Current transformer ratios, Power transformer ratios, anti pumping logic, master trip relay logic trip circuit supervision logic, operation counter, fault counter, 3-phase under voltage monitoring, 3-phase over voltage logic, switching logic for all electrical, mechanical, electromechanical equipment, analog meter functions, digital meter functions, and the like. The individual equipment functions will now be monitored through said device, thus, replacing the auxiliary devices which perform these functions. The device of this invention thus overrides the existing auxiliary devices.
Typically, on a MV switch gear panel various types of protection relays are required. These devices are used to monitor the voltage/current or different parameters of power element and issue a trip command in case of fault condition. One of such device is an Over/Under Voltage relay which continuously monitors voltage of the system and if it goes below/above a

certain value issues a trip command. This relay is added as an inbuilt feature for the system of this invention, so that if any user wants to use a Voltage relay, he / she does not require to buy an extra device instead the system of this invention can work for this function.
In accordance with another embodiment of this invention, there is provided a fault defining means (12) in relation to associated relays of circuit breaker equipment, adapted to define thresholds of fault conditions. Any combination of relays can be selected for any type as fault input. Fault conditions are, typically, superseded in the order in which they occur.
In accordance with yet another embodiment of this invention, there is provided a trip control means (14) adapted for providing tripping control in relation to said associated relays as fault input upon detection. Selecting Trip ON for a particular fault condition will energize the circuit breaker coil in the event of that defined fault.
In accordance with still another embodiment of this invention, there is provided a Current Transformer value defining means (16) adapted to define Current Transformer Primary and Secondary Ratio values.
In accordance with an additional embodiment of this invention, there is provided a Voltage Transformer value defining means (18) adapted to define Voltage Transformer Primary and Secondary Ratio values.
In accordance with yet an additional embodiment of this invention, there is provided an over-voltage parameter defining means (20) adapted to define over-

voltage parameters. Typically, these parameters include thresholds for over-voltage, time threshold for detecting an over-voltage and the like.
In accordance with yet an additional embodiment of this invention, there is provided an under-voltage parameter defining means (22) adapted to define under-voltage parameters. Typically, these parameters include thresholds for under-voltage, time threshold for detecting an under-voltage and the like.
In accordance with still an additional embodiment of this invention, there is provided a first control and monitoring means (24) adapted to control and monitor tripping coil and control closing coil along with master trip relay. According to the prior art, a TNC switch was being used for this operation. The TNC (Trip & Close) switch is used in a switch gear panel for tripping and closing the circuit breaker. The switch, according to the prior art, was a mechanical switch with two NO contact each selectable independently. The tripping and closing circuit are connected to each of these contacts in series (electrically). When the respective contact is closed, the corresponding circuit gets activated and circuit breaker is either tripped or closed. Now, according to this invention, in the electrical scheme, these contacts are connected to other interlock operations which are required by the customer. With the system of this invention, it is capable of providing facility of tripping and closing the circuit breaker; also it functions as Master trip relay as the mechanical contact switch is replaced by soft key of the electronic device. Further, various interlock operations can be performed just by setting the given parameters on breaker manager which is software feature. Thus, the mechanical contact TNC switch is removed and the current system can perform that operation.

In. accordance with still an additional embodiment of this invention, there is provided a second control and monitoring means (26) adapted to control and monitor antipumping device. Antipumping device is used in switchgear assemblies so that no false operation of circuit breaker takes place. False operation suggests that the user cannot issue trip and close commands simultaneously. If so, then the antipumping device blocks both the commands and the circuit breaker is protected from malfunctioning. Typically, Antipumping device is used to keep a check that both trip and close coil of the circuit breaker are not operated simultaneously. Since, the TNC switch is used to perform TRIP-CLOSE functions, it is possible that trip command is issued while someone is trying to close, which will result in malfunctioning of the circuit breaker which can increase the wear-tear of the circuit breaker. To stop the damage to the circuit breaker, this Antipumping device is used so that trip-close operation is not performed simultaneously. According to this invention, since the system is used to trip as well as close the breaker, it exercises all the control and will never issue trip-close command together. This is an inbuilt programmed feature in the current system. Hence, Antipumping device is not required in the control panel.
In accordance with still an additional embodiment of this invention, there is provided a third control and monitoring means (28) adapted to control and monitor trip circuit.
In accordance with still an additional embodiment of this invention, there is provided a fourth control and monitoring means (30) adapted to function as master trip relay to be used as an auxiliary device for trip circuit.

The master trip relay, typically, is a heavy duty contact relay which takes digital input and is capable of operating, any heavy duty coil. This heavy duty coil is same trip coil to trip the breaker. Since the system of this invention is capable of operating any heavy duty coil up to 600W, the requirement of master trip relay is removed from the control panel, and the current system performs the function of master trip relay.
In accordance with another additional embodiment of this invention, there is provided a switching means (32) adapted to switch said system operations from a local mode to a remote mode or from a remote mode to a local mode. According to the prior art, this switch was a manual switch. The LR switch (Local/Remote), according to the prior art, was a toggle switch with 1-NO-NC mechanical contact. This mechanical switch was required on switch gear panel for shifting the control of the panel from local to remote and vice-versa. The local control is the control given on the panel itself and remote control is at a distant from the place where the panel is located. This remote feature enables the user to control the functions of the panel without physically going to that location. Now since all the auxiliary functions and interlock operations are performed by breaker manager itself, the mechanical LR switch is removed from the panel. Instead a soft key is provided on the electronic device and by software the functioning of the panel can be switched form to Local to remote and vice-a-versa.
In accordance with yet another additional embodiment of this invention, there is provided an operation counter (35) adapted to count the number ot trip-close operations that the circuit breaker has performed, so that an automated service log may be created for requesting servicing of circuit breaker. According to the

prior art, the operation counter is a mechanical counter physically mounted on the circuit breaker. The counter increases by count of 1 after one trip-close operation. This counter is provided for the customer so as to keep check of the service schedule of the circuit breaker. The circuit breaker being a big physical mechanism requires frequent maintenance. With this operation counter user can plan his schedule. The system of this invention has inbuilt (digital) operation counter, typically, based on commands issued in relation to tripping and closing, hence removing the requirement of mechanical counter.
In accordance with another embodiment of this invention, there is provided a display and alarm means (34) which includes text display means, audio annuciators, visual annunciators, or any combination thereof. Typically, it shows various ratings such as current working parameters, voltage rating parameters, threshold working parameters, breach of working parameters, user-defined parameters, and the like. Typically, it indicates various status of information which are on-going inside said system. The different parameters which are indicated are Trip circuit health, Phase healthy, VCB ON, VCB OFF, spring charge, local / remote mode of operation, test, service, and different fault indications in digital format. Typically, it also indicates meter readings of an associated switch gear assembly such as voltage meter, current meter, KVA meter, KVAR meter, KW meter, PF meter, and the like in digital format.
There are various types of indication lamps required on a MV switch gear panel for displaying the internal functions and status of the control panel. These glow lamps are available in different colours and voltage rating and occupy a big space on the control panel. In accordance with the system of this invention, it performs all the functions of the control system of the panel all these indications

lamps are not required. Typically, high brightness LED's are provided on the electronic device to perform these operations. Hence, removing the requirement of glow lamps and wiring required for them which is done by the panel manufacturer.
Typically, according to the prior art, on a MV switch gear control panel different types of metering devices are also required. These include Current, Voltage, KVA, KVAR, KW, and PF. These are available in analog type / electronic type. The system of this invention includes all these metering function within itself hence removing the requirement of any type meter, also saving the time and cost of wiring to be done for each of this meter.
According to an exemplary embodiment, some display status can be as follows:

LED indicator Meaning
VCB ON LED On: The Breaker is Closed.
Off: The Breaker is Open.
VCB OFF LED On: The Breaker is Open.
Off: The Breaker is Closed.
SPR CHRG LED On: Spring Charged.
Off: Spring Discharged.
TEST LED On: Breaker TEST in progress.
Off: No TEST in progress.
SERVICE LED On: Breaker SERVICE in progress.
Off: No SERVICE in progress.

F1 LED On: Fault Fl Detected and Not Cleared.
Off: Fault Fl Cleared.
F2 LED On: Fault F2 Detected and Not Cleared.
Off: Fault F2 Cleared.
F3 LED On: Fault F3 Detected and Not Cleared.
Off: Fault F3 Cleared.
F4 LED On: Fault F4 Detected and Not Cleared.
Off: Fault F4 Cleared.
F5 LED On: Fault F5 Detected and Not Cleared.
Off: Fault F5 Cleared.
F6 LED On: Fault F6 Detected and Not Cleared.
Off: Fault F6 Cleared.
Preferably, the display means is set to incorporate multiple views, for showcasing the entire range of functionalities.
According to additional exemplary embodiments, a first view of said display means will display a Fault Allocation display means (36) which will be used for associating various fault inputs to the various relays. Any combination of relays can be selected for any type of Fault input. Fault conditions may be superseded in the order in which they occur. A second view of said display means will display a Trip Allocation display means (38) which will be used for associating Breaker Trip condition to various fault inputs. Selecting Trip ON for a particular fault Condition will energize the Breaker Trip Coil in event of that fault. A third view of said display means will display a CT Ratio Setting display means (40) which will be used for entering the CT Primary and Secondary

Ratios. A fourth view of said display means will display a VT Ratio Setting display means (42) which will be used for entering the VT Primary and Secondary Ratios. A fifth view of said display means will display an Over Voltage Setting display means (44) which will be used for Enabling over Voltage Relay Parameters. A sixth view of said display means will display an Under Voltage Setting display means (46) which will be used for Enabling under Voltage Relay Parameters.
The multi(six)-window annunciation given on the breaker manager is used to distinguish between different types of fault which caused the circuit breaker to trip. On control panel suppose there is a voltage relay and a current relay (for example). Both these relay can issue a trip command to the current system by using two of the six available windows, and breaker manager trips the breaker. It is necessary for user to understand the reason by which the system of this invention has tripped the circuit breaker. This indication is given on character display of the breaker manager and also LED indication is given for each of the 6 fault input. As soon as the current system trips the circuit breaker, the respective LED indication is made ON and display shows the fault. Now, one annunciation key is provided on the electronic device, after fault has occurred and unless someone presses this key the system will not allow the user the close the breaker. This key is supposed to be pressed after the respective fault is removed.
In accordance with yet another embodiment of this invention, there is provided a Programming means (47) i.e. CT Ratio Setting input means (48), VT Ratio Setting input means (50), Over-Voltage Setting input means (52), Over-Voltage Setting input means (54) for user - defined changing / tweaking of operating

parameters and thresholds. A user may navigate through the menus, as displayed on the various views of said display means and sets the required parameter values. Working operations specific to the use, application, input available, output required may be keyed in to effectively monitor in an optimised manner.
According to an exemplary embodiment, the programming means such as a keypad is composed of two sections. The Navigation section typically comprises four arrow keys, one cancel key and one enter key. The other Section comprises four keys used for Trip Circuit Supervision, Local/Remote Configuration, and Breaker Close/Open Configurations. Special Function keys may be provided for functions such as:
i. TCH [Trip Circuit Healthy] Key for Testing of Trip Circuit. ii. L/R [Local/Remote] Key for Local and Remote Settings, iii. I [CLOSE] Key for Breaker Close, iv. O [OPEN] Key for Breaker Open.
According to the prior art, The TCH button or TCH relay was required on switch gear panel for continuous monitoring the Trip circuit of the circuit breaker. The circuit breaker primary function is to isolate the load during fault condition by tripping. If the trip circuit goes bad or is faulty, due to any reason, the main function of the circuit breaker is not achieved. So, the TCH relay provides an alarm or flag signal indication whenever the trip circuit goes bad. In the present invention, the system is used to trip the circuit breaker and the trip coil is directly connected to the electronic device. It also performs the trip circuit supervision function. Also, the system of the current invention provided

an alarm and flag indication similar to TCH relay, hence removing the requirement of TCH relay from control panel.
In accordance with still another embodiment of this invention, there is provided a password protection means (51) adapted to allow only an authorized personnel to modify or regulate the values or operative parameters of said device.

We claim,
1. A multifunctional improvised electronic system for performing and monitoring interlock operations of a breaker assembly having a set of relay, tripping coil, and closing coil, said system comprising:
a. fault defining means in relation to associated said relays connected to
device via fault inputs, adapted to define thresholds of fault conditions;
b. trip control means adapted to provide tripping control in relation to said
relays (fault input) upon detection or breach of said defined thresholds of
fault conditions;
c. Current Transformer value defining means adapted to define Current
Transformer Primary and Secondary Ratio values;
d. Voltage Transformer value defining means adapted to define Voltage
Transformer Primary and Secondary Ratio values;
e. over-voltage parameter defining means adapted to define over-voltage
parameters;
f under-voltage parameter defining means adapted to define under-voltage parameters;
g. first control and monitoring means adapted to control closing coil and control and monitor tripping coil along with master trip relay based on at least one value from said Current Transformer Primary and Secondary Ratio value, said Voltage Transformer Primary and Secondary Ratio value, said defined over-voltage parameters, said defined under-voltage parameters;
h. second control and monitoring means adapted to digitally control and monitor devices such as antipumping device based on simultaneous

trigger of said tripping coil and said closing coil, for preventing simultaneous operation of said tripping coil and said closing coil; i. third control and monitoring means adapted to digitally control and monitor trip circuit based on the trip coil which is connected to the device, by monitoring the complete circuit in order to determine the health status of said trip circuit; j. fourth control and monitoring means adapted to functions as master trip
relay adapted to be used as an auxiliary device for trip circuit; k. switching means adapted to digitally switch said interlock operations from a local mode to a remote mode or from a remote mode to a local mode; and j. display and alarm means which includes text display means, audio annuciators, visual annunciators, or any combination thereof adapted to digitally display a plurality of rating parameters selected from current working parameters, voltage rating parameters, threshold working parameters, breach of working parameters, user-defined parameters, Trip circuit health, Phase healthy, VCB ON, VCB OFF, spring charge, local / remote mode of operation, test, service, different fault indications in digital format, voltage meter, current meter, KVA meter, KVAR meter, KW meter, PF meter; and m. means to control said circuit breaker based on at least one value from said Current Transformer Primary and Secondary Ratio value, said Voltage Transformer Primary and Secondary Ratio value, said defined over-voltage parameters, said defined under-voltage parameters. 2. A system as claimed in claim 1 wherein, said display means includes a Fault Allocation display means adapted to display various fault inputs in relation to the various relays.

3. A system as claimed in claim 1 wherein, said display means includes a Trip Allocation display means adapted to display associating Breaker Trip condition to various fault inputs.
4. A system as claimed in claim 1 wherein, said display means includes a CT Ratio Setting display means adapted to display CT Primary and Secondary Ratio values.
5. A system as claimed in claim 1 wherein, said system includes a CT Ratio Setting input means adapted to input CT Primary and Secondary Ratio values.
6. A system as claimed in claim 1 wherein, said display means includes a VT Ratio Setting display means adapted to display VT Primary and Secondary Ratios.
7. A system as claimed in claim 1 wherein, said system includes a VT Ratio Setting input means adapted to input VT Primary and Secondary Ratio values.
8. A system as claimed in claim 1 wherein, said display means includes an Over Voltage Setting display adapted to which will be used for Enabling over Voltage Relay Parameters.
9. A system as claimed in claim 1 wherein, said system includes a Under Voltage Setting means adapted to enable under Voltage Relay Parameters
10.A system as claimed in claim 1 wherein, said system includes a Under Voltage Setting display means adapted to display Under Voltage Settings which will be used for Enabling under Voltage Relay Parameters.
3 1.A system as claimed in claim 1 wherein, said system includes a selection means adapted to select at least one function from the plurality of functions that said device is adapted to cater.

12.A system as claimed in claim 1 wherein, said fault defining means includes means to define fault for any combination of relays which can be selected for any type of fault.
13.A system as claimed in claim 1 wherein, said fault defining means includes means to prioritize faults for providing action.
14.A system as claimed in claim 1 wherein, said system includes password protection means adapted to allow only an authorized personnel to modify.or regulate the values or operative parameters of said device.
15.A system as claimed in claim 1 wherein, said system includes operation counter adapted to count the number of trip-close operations that the circuit breaker has performed, so that an automated service log may be created for requesting servicing of circuit breaker