DESC:TECHNICAL FIELD

The present invention relates generally to a current source and, particularly, to an alternate arrangement of multiple current sources scheming using a single servo system for interlocking multiple drives system by servo application

BACKGROUND

Conventional construction of the current source involves a manual arrangement for core and dimmer for obtaining current. With advancement in electronics the concept for servo mechanism was developed involving semiconductor physics. Servo controllers with precise current controlling incur a huge cost for the circuit. So a need for developing a circuit for optimizing of current source was felt.

This invention covers the limitation by automated current sources viz., the operation of servo-controller involves continuous monitoring of output of transformer and according to that output, give corresponding command to the monitor, connected to the shaft of dimmer, in order to take position to supply required current at the output. This operational function of servo controller takes an ample amount of time which is unsuitable for carrying out instantaneous tests. While carrying out instantaneous tests, number of positive or negative pulses and difference between two consecutive current pulses should be considered.

Thus, in view of the above mentioned limitations of the convention system, there exists a need for an innovative scheme for interlocking multiple drives system by using a servo application.

SUMMARY

This summary is provided to introduce concepts related to an alternate arrangement of multiple current sources scheming using a single servo system for interlocking multiple drives system by servo application. This summary is not intended to identify essential features of the subject matter nor is it intended for use in determining or limiting the scope of the subject matter.

In one implementation, a system is disclosed for low voltage high current multiple drives that can be connected using a relay circuit for accurate scheming of drives.

In one implementation, the system is disclosed that provides an easy management and interlocking of drives that is obtained by carefully expediting the servo with DC motor. In one example, teeth of the DC motor should be connected so that it does not come in contact with dimmer operated via stepper motor.

In one implementation, the system provides a scheme for an arrangement so that the drives for multiple sources can be arranged alternatively. This ensures the optimization of high cost servo controller available in a marketplace.

In one implementation, the disclosed invention covers the limitation by automated current sources viz., the operation of servo controller involves continuous monitoring of output of transformer and according to that output, give corresponding command to a monitor, connected to a shaft of dimmer, in order to take position to supply required current at the output. This operational function of servo controller takes an ample amount of time which is unsuitable for carrying out instantaneous tests. While carrying out instantaneous tests, number of positive or negative pulses and difference between two consecutive current pulses should be considered.

Accordingly, in one implementation, a system for connecting low voltage high current multiple drives using a relay circuit is disclosed. The system comprises of at least one alternating current (AC) source, wherein one phase of the at least one alternating current (AC) source is supplied to an electromechanical switch, and another phase of the at least one alternating current (AC) source is supplied to a thermistor. The thermistor senses at least one windings of a transformer and breaks a supply circuit. At least one servo controller is also disclosed that is configured to receive feedback from the transformer and transmit the feedback to at least one motor to rotate, wherein the at least one motor rotates to generate an output current. The at least one transient recorder configured to record data, and at least one relay circuit is also disclosed.

In one implementation, the relay circuit will ensure the auto changeover among the current source.

In one implementation, the recorder keeps the record of the current variations in the circuit i.e., how much value the current has been departed from the actual value.

Conventionally only one current source can be connected to multiple drives. But after including the changeover (in the present invention) the functionality of the overall system is enhanced.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

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 drawings to refer like features and components.

Figure 1 illustrates a construction of a low voltage high current source is shown, in accordance with an embodiment of the present subject matter.

Figure 2 illustrates a circuit the tooth of DC motor for fast response time operation is shown, in accordance with an embodiment of the present subject matter.

Figure 3 illustrates an alternate arrangements of multiple sources via relay circuit is shown, in accordance with an embodiment of the present subject matter.

Figure 4 illustrates a prevention of CT’s secondary open circuit is shown, in accordance with an embodiment of the present subject matter.

Figure 5 illustrates a timing waveform obtained with piezoelectric method circuit
is shown, in accordance with an embodiment of the present subject matter.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

Preferred embodiments of the present disclosure will be described herein below with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the present disclosure in unnecessary detail.

The terms and words used in the following description are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention.

It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.

A normal construction of automated power source involves 3 phase supply taken from the available source of AC supply and 1 phase is supplied to electromechanical switch viz., a contactor 2 and another phase is supplied to thermistor. A thermistor senses the windings of the transformer and breaks the supply circuit incase temperature is exceeded. The supply is then given to servo controller, whose function is to take feedback from current transformer and give corresponding position to the stepper motor to rotate and required output current is provided.

Figure 1 shows the construction of a low voltage high current source.

The operation of servo controller involves continuous monitoring of output of transformer and according to that output, gives corresponding command to the monitor, connected to the shaft of dimmer, in order to take position to supply required current at the output. This operational function of servo controller takes an ample amount of time which is unsuitable for carrying out instantaneous tests. While carrying out instantaneous tests, number of positive or negative pulses and difference between two consecutive current pulses should be considered.

The servo controller is expensive, so it would be an adaptable and productive to increase the utilizing capacity of a servo controller. For this, we need to shift the control of servo controller to another unit. The other equipment in current source is the transient recorder used for fast recording of data.

The current source presently provides a control action for a single source only. The servo controller can be optimized to alternatively control two or more current sources. A detailed relay circuit is explained in the invention. The circuit can also be planned to work as a Master slave combination. This can be achieved by providing a switch so that complete control can be transferred from one source to another.

In this mode source1 can be operated in transient mode which will give a very high value of current for short duration of time. Servo controller gets a feedback from CT’s and according to that output servo controller gives command to the servo motor so as to raise the voltage given to the primary of the transformer with this switch we can directly increase the voltage of transformer without feedback

In another mode a switch will be provided by which servo controller will be completely bypassed. The servo controller receives a feedback from the secondary of a current transformer and accordingly gives required pulses to the stepper motor to rotate a fixed degree, in order to maintain the required current at the output. However, servo controller takes a considerable amount of time to maintain the required current at the output, which is considered as a major disadvantage during instantaneous operation.

In order to eliminate the disadvantages of slow response of servo controller during the instantaneous test an independent dc motor should be connected to the existing rim, on which the stepper motor is connected. The dc motor should be with speed of 30 rpm and an operating torque of 3 kg-m2 and DC motor teeth should be of specifications as shown in figure 2.

Now to eliminate the disadvantage of servo controller being operated by a single source a switch was installed to alternate the arrangement for operation of other source. The alternate arrangement can be obtained by the CAM switch but its precision will affect the performance of source. So the relay circuit as shown in figure 3 can be used for alternate arrangement of sources.

Also a consideration should be done so that, in this alternate arrangement, the current transformer should not be an open circuited.

Figure 4 shows the CT in the source should not remain open circuit at any instant.

As shown in figure 4 the current sources can be connected using arrangement in figure 5. This circuitry can be further optimized improved by replacing the sources through a transformer and providing a single source for multiple range operation.

In one implementation, a system for connecting low voltage high current multiple drives using a relay circuit is disclosed. The system comprises of at least one alternating current (AC) source, wherein one phase of the at least one alternating current (AC) source is supplied to an electromechanical switch, and another phase of the at least one alternating current (AC) source is supplied to a thermistor. The thermistor senses at least one windings of a transformer and breaks a supply circuit. At least one servo controller is also disclosed that is configured to receive feedback from the transformer and transmit the feedback to at least one motor to rotate, wherein the at least one motor rotates to generate an output current. The at least one transient recorder configured to record data, and at least one relay circuit is also disclosed.

In one implementation, the at least one servo controller transmits a command to the at least one motor to raise a voltage given to a primary of the transformer.

In one implementation, one phase of the at least one alternating current (AC) source is supplied to electromechanical switch using at least one contractor.

In one implementation, the switch directly increases the voltage of transformer without feedback.

In one implementation, the at least one servo controller continuously monitors the output of the transformer and based on the output transmits the command to a monitor, connected to a shaft of a dimmer, in order to supply a required current at the output.

In one implementation, the electromechanical switch is configured to transfer a control from the at least one alternating current (AC) source to the other.

In one implementation, an independent DC motor is connected to an existing rim, on which the stepper motor is connected.

Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include those provided by the following listed features:

1. Accurate measurements are provided by the system.
2. Less distortion is achieved by the system.
3. Automation for current adjustment eliminating manual error is achieved by the system.
4. COCOMO is considered for current source optimization.
5. The proposed system can be easily interfaced with PC.
6. The proposed system can be used for magnitude of wide range current.
7. The proposed system can be easily constructed.
8. Single servo controller can be used for controlling multiple sources.
9. The proposed system is effective for testing of switchgear products for checking tripping characteristic model.
10. The proposed system is easy to repair and no special circuitry is required.
11. The effects from nearby magnetic field are less as compared to the resistances and the current transformers.
12. Remote viewing and controlling of current is also achieved.
13. This most important feature of the invention is that the system provides efficient results for the low voltage high current drives where the alternate controlling for multiple sources are required. The most critical part is the design of tooth in the motor used for controlling and the rotating angle should within 30° ±2°error.

Apart from above mentioned features, the invention has some unique features. The features are listed below:

1. A circuit providing current source outputs that are independent of erroneous switching is disclosed.
2. A disclosed invention uses electromagnet with DC motor for instantaneous operation, the electromagnet will be magnetized engaging the motor to the rim and during the normal operation; the electromagnet will be demagnetized to disengage the dc motor from the rim.
3. A circuit using relay for alternate operation of current sources is disclosed.
4. The disclosed system can be further be optimized and can be accurately controlled through precise servo controllers.
5. A circuit that can provide a fast response to the changing circuitry is disclosed.
6. A plurality arrangement which provides the specification for use of specific size of teeth for DC motor is disclosed.

Although the an alternate arrangement of multiple current sources scheming using a single servo system for interlocking multiple drives system by servo application have been described in language specific to structural features and/or methods, it is to be understood that the embodiments disclosed in the above section are not necessarily limited to the specific features or methods or devices described. Rather, the specific features are disclosed as examples of implementations an alternate arrangement of multiple current sources scheming using a single servo system for interlocking multiple drives system by servo application.
,CLAIMS:1. A system for connecting low voltage high current multiple drives using a relay circuit, the system comprising:
at least one alternating current (AC) source, wherein one phase of the at least one alternating current (AC) source is supplied to an electromechanical switch, and another phase of the at least one alternating current (AC) source is supplied to a thermistor;
the thermistor senses at least one windings of a transformer and breaks a supply circuit;
at least one servo controller configured to receive feedback from the transformer and transmit the feedback to at least one motor to rotate, wherein the at least one motor rotates to generate an output current;
at least one transient recorder configured to record data, wherein said data comprises of a variation in said relay circuit;
at least one relay circuit configure to ensure an auto-change in said alternating current (AC) source.

2. The system as claimed in claim 1, wherein the at least one servo controller transmits a command to the at least one motor to raise a voltage given to a primary of the transformer.

3. The system as claimed in claim 1, wherein one phase of the at least one alternating current (AC) source is supplied to electromechanical switch using at least one contractor.

4. The system as claimed in claims 1 to 3, wherein the switch directly increases the voltage of transformer without feedback.

5. The system as claimed in claims 1 to 4, wherein the at least one servo controller continuously monitors the output of the transformer and based on the output transmits the command to a monitor, connected to a shaft of a dimmer, in order to supply a required current at the output.

6. The system as claimed in claims 1 to 5, wherein the electromechanical switch is configured to transfer a control from the at least one alternating current (AC) source to the other.

7. The system as claimed in claims 1 to 6, wherein an independent DC motor is connected to an existing rim, on which the stepper motor is connected.