CN103824731B - A kind of method realizing circuit breaker feedback function - Google Patents

Abstract

The invention provides a method for realizing the feedback function of a circuit breaker. The method includes: (1) the control module sends a control command to the stepping motor; (2) the stepping motor controls the circuit breaker to pull/close; (3) feedback Loop feedback circuit breaker status. The invention saves manual operation and increases the reliability of control. The invention can realize the feedback of the state of the circuit breaker. The solution of the circuit breaker in the present invention is simple and easy to realize, and the modification cost of the circuit breaker is small. The present invention can feed back the state of the circuit breaker more comprehensively, which is convenient for the operator to understand the state of the circuit breaker. The states of the circuit breaker that can be fed back by the present invention include the closing state, the switching state and the waiting state for closing.

Description

A Method for Realizing the Feedback Function of Circuit Breaker

technical field

The invention relates to a circuit breaker control technology, in particular to a method for realizing the feedback function of the circuit breaker.

Background technique

A circuit breaker is a load device installed between a power supply and a load unit to protect motors, transformers, and transmission lines. Used to protect power distribution circuits against arcing faults, ground faults, short circuit faults and/or overloads.

When a fault or overload condition is detected on the protected circuit, the circuit breaker trips to open the separable contacts of the circuit breaker and thereby interrupt the flow of current in the protected circuit. The status of a circuit breaker is generally indicated by the position of the actuation handle, which indicates whether the circuit breaker is in the ON (connected) position, the OFF (disconnected) position, or the TRIPPED (tripped) position. However, when the circuit breaker is tripped, the position of the actuation handle does not indicate the type of fault that caused the trip condition. In other words, the general circuit breaker does not have the functions of feedback and communication, and the staff cannot know the operating status of the circuit breaker in time, so there may be misoperation or failure to deal with the symptoms of failure in time.

Contents of the invention

Aiming at the deficiencies of the prior art, the invention provides a method for realizing the feedback function of the circuit breaker. The present invention adds a control feedback circuit to the circuit breaker. On the one hand, the present invention can realize the simple control of the circuit breaker, and on the other hand, it can also realize the timely feedback of the state of the circuit breaker, including closing state, closing state, waiting for closing state, the solution provided by the present invention can realize the control of the circuit breaker and the feedback function of the circuit breaker with little modification. This scheme has the characteristics of simple operation, small modification amount and high efficiency.

The object of the present invention is to adopt following technical scheme to realize:

A method for realizing the feedback function of a circuit breaker, the improvement of which is that the method includes:

(1) The control module issues control commands to the stepper motor;

(2) The stepper motor controls the circuit breaker to pull/close;

(3) The feedback loop feeds back the state of the circuit breaker.

Preferably, the step (1) includes that the control module can issue different control commands to the stepper motor according to different control signals.

Preferably, the control signal includes the control line outputting two voltage signals of 0v and 220v.

Preferably, the step (2) includes the forward rotation or reverse rotation of the stepping motor, so as to realize switching and closing of the circuit breaker, wherein the circuit breaker switch is physically linked with the single-pole double-throw switch on the feedback loop.

Preferably, said step (2) includes

When the control line is input with 220v voltage, the stepper motor rotates to close the circuit breaker switch, the feedback loop SPDT switch is linked, turns to terminal b, and the circuit breaker enters the closing state; and

When the control line inputs 0v voltage, the stepper motor rotates in reverse to disconnect the circuit breaker switch, the SPDT switch on the feedback loop turns to terminal a, and the circuit breaker enters the tripping state.

Further, when the 220v voltage is input to the control line, the switch of the circuit breaker is manually turned off, and the switch on the feedback loop turns to terminal a, and the circuit breaker is in a waiting state for closing.

Further, when the control line inputs 0v voltage, the circuit breaker is manually closed, and the control module detects that the voltage on the feedback loop rises, and at this time, a trip command is sent to the stepper motor again, and the stepper motor is switched on again.

Preferably, the step (3) includes that the feedback loop can feed back the state of the circuit breaker through the voltage signal, and the state includes the switched state, the closed state and the waiting state for closing.

Preferably, the resistance ratio of the resistor R1 and the resistor R2 on the feedback loop is 2:1.

Compared with the prior art, the beneficial effects of the present invention are:

1. A method for realizing the circuit breaker feedback function provided by the present invention can realize automatic opening and closing, which saves manual operation and increases the reliability of control.

2. The present invention can realize the feedback of the state of the circuit breaker.

3. The solution of the circuit breaker in the present invention is simple and easy to realize, and the modification cost of the circuit breaker is small.

4. The present invention can feed back the state of the circuit breaker in a relatively comprehensive manner, which is convenient for the operator to understand the state of the circuit breaker. The states of the circuit breaker that can be fed back by the present invention include the closing state, the closing state and the waiting state.

Description of drawings

Fig. 1 is a structural schematic diagram of a circuit breaker with feedback function provided by the present invention.

Fig. 2 is a structural schematic diagram of a circuit breaker feedback loop with feedback function provided by the present invention.

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in FIG. 1 , a circuit breaker with feedback function of the present invention is composed of a feedback loop 1 , a control module 2 and a stepping motor 3 . The feedback loop can feed back the state of the circuit breaker through the voltage signal. The single pole double throw switch on the feedback loop is physically linked with the circuit breaker switch. When the circuit breaker is closed, the switch of the feedback loop turns to terminal b. When the circuit breaker is switched on, The switch of the feedback loop turns to terminal a. The resistance ratio of resistor R1 and resistor R2 on the feedback loop is 2:1. The feedback loop can feed back the three states of the circuit breaker through the voltage signal: switching state, closing state and waiting to close state .

The control module can send different control commands to the stepper motor according to the different control signals to realize the automatic opening and closing of the circuit breaker. The control line can output two voltage signals of 0v and 220v. When the control voltage output is 220v, the circuit breaker Closing, when the control voltage output is 0v, the circuit breaker is switched on, and the control module also has the function of trip maintenance. When the circuit breaker control signal is input to 0v, the control module will send a trip command to the stepper motor again when closing manually; The stepper motor can receive commands from the control module to control the motor to rotate forward or reversely, so as to realize the opening and closing of the circuit breaker.

In the trip state, when the control line inputs 220v voltage, the control module sends a closing command to the stepping motor Ta, the stepping motor rotates to close the circuit breaker switch, the feedback loop SPDT is linked, and turns to the b terminal, and the b terminal passes through The 100kΩ resistor is connected to the live wire, so the feedback line outputs 220v voltage, indicating that the closing command is executed successfully, and the circuit breaker enters the closing state. At this time, if the switch of the circuit breaker is manually disconnected, the switch on the feedback loop turns to terminal a. At this time The output voltage of the feedback line is about 73v, and the circuit breaker is waiting to close at this time;

In the closed state, when the control line inputs 0v voltage, the control module sends a trip command to the stepping motor Ta, and the stepping motor rotates in the opposite direction to disconnect the circuit breaker switch, and the SPDT switch on the feedback loop turns to terminal a, and this At this time, the output voltage of the feedback line is 0v, and the circuit breaker enters the trip state. If the circuit breaker is manually closed at this time, the control module will detect that the voltage on the feedback loop has risen. The motor switches on again.

Example

The present embodiment takes the tripping and closing process as an example to illustrate the working process of the present invention, specifically:

Start the circuit breaker to close. At this time, the initial state of the circuit breaker is disconnected, the voltage input of the control line is 0v, the single-pole double-throw switch on the feedback loop is connected to a, and the control line and the neutral line have the same potential, so the voltage on the feedback line The output signal is 0v, if the circuit breaker is manually closed at this time, the SPDT switch of the feedback loop is turned to terminal b, and terminal b is connected to the live wire, the output voltage is 220v, the control module detects that the control voltage is 0v and the feedback line outputs 220v When the voltage is high, it is judged as abnormal closing, and a trip command is sent to the stepping motor Ta to return to the trip state. First, input a 220v voltage signal on the control line, the control line is connected to the synchronous motor Ta, Ta receives the 220v control signal, the other branch of the control line is connected to the neutral line, and there are two voltage dividing resistors R1 and R2 on the branch, R1 The ratio to the resistance of R2 is 2:1, so the feedback voltage at terminal a is 1/3 of the control voltage, and the circuit breaker enters the waiting state for closing; at this time, the synchronous motor Ta drives the circuit breaker switch to close, and the feedback loop The single-pole double-throw switch is linked to the b terminal. At this time, the feedback loop is connected to the live wire through the resistor R, and the output feedback voltage is 220v, and the circuit breaker enters the closing state.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (5)

1. realize a method for circuit breaker feedback function, it is characterized in that, described method comprises:

(1) control module sends control command to stepping motor;

(2) step motor control circuit breaker carries out operating a switch or closing a floodgate;

(3) state of feedback loop circuit breaker;

Described step (1) comprises control module according to the difference of control signal, can send different control commands to stepping motor;

Described control signal comprises control line input 0v and 220v two kinds of voltage signals;

Described step (2) comprises stepping motor forward or reverse, thus realizes operating a switch or closing a floodgate of circuit breaker, and the single-pole double-throw switch (SPDT) physics wherein on the switch of circuit breaker and feedback loop links;

Described step (2) comprises

When control line input 220v voltage, stepping motor rotates forward the switch of the circuit breaker that closes, the single-pole double-throw switch (SPDT) interlock on feedback loop, and turn to b to hold, circuit breaker enters "on" position; With

When control line input 0v voltage, stepping motor rotates backward the switch of cut-off breaker, and the single-pole double-throw switch (SPDT) on feedback loop turns to a to hold, and circuit breaker enters the state of operating a switch;

Described feedback loop comprises single-pole double-throw switch (SPDT), the first resistance R1 and the second resistance R2.

2. a kind of method realizing circuit breaker feedback function as claimed in claim 1, it is characterized in that, described when control line input 220v voltage, manually the switch of circuit breaker is disconnected, single-pole double-throw switch (SPDT) on feedback loop turns to a to hold, and now circuit breaker is in wait "on" position.

3. a kind of method realizing circuit breaker feedback function as claimed in claim 1, it is characterized in that, described when control line input 0v voltage, be manually breaker closing, control module detects that the voltage on feedback loop raises, now again send trip signal to stepping motor, stepping motor is operated a switch again.

4. a kind of method realizing circuit breaker feedback function as claimed in claim 1, it is characterized in that, described step (3) comprises feedback loop can feed back circuit breaker state by voltage signal, and its state comprises the state of operating a switch, "on" position and wait "on" position.

5. a kind of method realizing circuit breaker feedback function as claimed in claim 1, it is characterized in that, the first resistance R1 on described feedback loop and the second resistance R2 resistance value ratio are 2:1.