KR101532885B1 - Relay contact welding warning system and method thereof - Google Patents

Abstract

A relay contact point fusion warning system and method are disclosed. The relay contact point fusion warning system comprises: a detection unit to acquire change data according to control from a current transformer (CT) for a meter to detect a fusion state of a relay; a signal unit to notify a system manager of the condition of the relay when an abnormality in the relay occurs; and a control unit to secure a normal contact point condition of the relay by changing an electric signal transmitted to the relay if the cause of the abnormality is a fusion phenomenon.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay contact fusing warning system,

The present invention relates to a relay contact fusion warning system and method. And more particularly, to a relay contact fusing warning system and method that minimizes a problem caused by a fusing phenomenon of a relay contact.

A relay is an electronic part that opens and closes a circuit in accordance with a control signal from a driving circuit, and is used mainly in the field of facility control. Here, since the relay is a mechanical switch, an additional circuit device is required in order to check the failure of the relay in a remote control device such as a computer. Accordingly, in a system for remotely controlling a remote site, even if the relay switch is turned on, the accurate state of the relay can not be grasped. In addition, if you use a latching type relay controlled by a pulse signal, it is more difficult to remotely check the current state.

There is a method of checking the relay operation by sensing the voltage difference when the contact is turned on / off, which is simply used to check whether there is a relay operation. This determines the relay operation state by connecting the voltage measuring means to the relay in parallel and measuring the voltage across the relay.

Such power relays have a tendency to increase in usage field and quantity due to their high usability, and accordingly, additional stabilizers for errors of relays are essential to increase the reliability of the applied devices.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a relay contact fusing warning system and method capable of promptly confirming and responding to a system error by judging whether a fusing phenomenon of a relay contact occurs, .

 SUMMARY OF THE INVENTION The present invention is directed to a relay contact fusing warning system and method that improves reliability by minimizing problems caused by fusing phenomenon by solving the relay fusing phenomenon by varying the voltage applied to the relay itself when the fusing phenomenon occurs at the relay contacts .

According to an aspect of the present invention, there is provided a relay contact fusion warning system, comprising: a detector for obtaining change data according to a control through a current transformer (CT) and detecting a fusion state of the relay; A signal unit for notifying the system administrator of the status of the relay when the relay is abnormally generated; And a control unit for securing a normal contact state of the relay by changing electric signals sent to the relay when the cause of the occurrence of the abnormality is a fusion phenomenon.

According to another aspect of the present invention, the control unit applies a voltage higher than a voltage applied to the relay to ensure whether the relay is in a normal contact state.

According to another aspect of the present invention, there is provided a relay contact fusing warning method using a relay contact fusing warning system, comprising: acquiring change data according to a control through a current transformer (CT); Analyzing the change data to determine whether the relay is abnormal; Notifying a system administrator of the status of the relay when the relay is abnormally generated; And securing a contact normal state of the relay in the system when the cause of the occurrence of the abnormality is a fusion phenomenon.

According to another aspect, securing the normal contact state of the relay includes applying a voltage higher than a voltage applied to the relay; Determining whether a normal contact state of the relay is recovered; And maintaining the contact state of the relay in an off state.

According to another aspect of the present invention, the step of determining whether or not the relay is abnormal may be performed by comparing the presence or absence of the signal transmission of the control unit and the current transformer of the instrument capable of checking whether current is conducted, have.

According to the embodiments of the present invention, a relay contact fusing warning system and method are provided for determining whether a fusing phenomenon of a contact of a relay occurs and notifying the administrator of the occurrence of the fusing phenomenon of the relay, .

According to the embodiments of the present invention, a relay contact fusing warning system and method for improving the reliability by minimizing a problem caused by fusing phenomenon by solving the relay fusing phenomenon by varying the voltage applied to the relay itself when the fusing phenomenon of the relay contacts occurs .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a time relationship between an inrush current waveform and a load according to an embodiment of the present invention; FIG.
FIG. 2 is a flowchart illustrating a relay contact fusion warning method using a relay contact fusion warning system according to an embodiment of the present invention.
3 is a flowchart for explaining an example of a relay contact fusion warning method according to an embodiment of the present invention.
4 is a block diagram illustrating a relay contact fusion alarm system according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A relay is called a relay in the sense of connecting electricity and can be defined as a mechanical device that can open and close an electric circuit due to the operation of a relay contact when an input value designed to the relay itself is applied.

The principle of the relay structure is as follows. A coil is wound around an iron core, and a magnetic yoke (yoke), a armature attracted by a magnetic force, And relay contacts that move according to the movement of the internal device. Electrical contacts must operate safely across a wide range of switches, from small relays to large breakers, depending on current capacity.

When an electric current is applied to the coil for relay operation, an electromotive force is generated, and the iron core itself becomes an electromagnet by the coil. Then, a large number of lines of magnetic force (magnetic flux) generated by the coil pass through the iron cores and pass through the iron cores. This is caused by the difference in permeability between iron and air. Here, the permeability is a value indicating how much medium is magnetized for a given magnetic field.

로 표현하며, 정의된 값은 다음 식과 같이 나타낼 수 있다.The permeability of the vacuum is typically

, And the defined value can be expressed as the following equation.

Here, the permeability of air also approximates to the permeability of vacuum, and this value is used, which is a very small value close to zero.

On the contrary, since ferromagnetism such as iron (ferromagnetism, magnetic property of a substance magnetized in the absence of an external magnetic field) and ferrimagnetic substance exhibits a relatively large value, .

In addition, the types of relays include armature relays applying the force of the electromagnet and latching relays (permanent relays) in which permanent magnets are arranged in the armature relays to maintain the state without flowing current to the coils Can be divided.

Here, the self-holding type relay can reduce the power consumption compared to the general relay because the state does not change even if the control device does not send the continuous signal, and the efficiency and stability of the device using the relay are maintained A height effect can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a time relationship between an inrush current waveform and a load according to an embodiment of the present invention; FIG.

Referring to FIG. 1, the relay can be applied to various loads. However, since the inrush current varies depending on the type of load applied to a general resistance load and a load of a different type, This can cause the relay to fail.

The relationship between the load and the rush current can be expressed as [Table 1].

The problems of material degradation of electrical contact point are contact resistance, consumption, fusion, transfer, and so on.

The classification of the contact resistance can be classified into an ohmic resistance, a coating resistance, and a concentrated resistance. The ohmic resistance is due to the inherent resistance and contact shape, and is a major cause of problems in high current devices in general. The coating resistance refers to the nonconductive, semi-conductive coating of the contact portion. The main causes are contact, corrosion, or sticking dust, dirt, and oil on the contact surface. The concentrated resistance refers to a current generated by a current moving through a small area due to contact of a minute portion when a closed circuit of a contact is formed.

The types of problems that occur at the contacts include previous, consumptions, and fusion.

The previous phenomenon refers to the movement from one contact to another, resulting in a hole in one contact and a protrusion in the other. The former cause is related to the polarity and is therefore mostly found in dc circuits.

Consumption is mainly due to the arc generated between the contacts. As a result of the arc energy, the contact surface is heated up to the boiling point, and vaporization occurs at both contacts, causing the metal to escape. In the case of a short arc, most of the releasing metal adheres to the contact surface, whereas in the case of a large current, the arc is long and the high temperature is higher than the contact surface.

Fusion refers to a phenomenon that occurs when the metal melted by an arc becomes a closed circuit and solidification of the metal occurs. Bounce phenomenon occurs due to the metal material when the contact is coupled, which causes a lot of arc in a very short time, resulting in fusion of the contact point. Fusing may occur even under a general resistance load, but in a circuit such as a motor or an incandescent lamp where a high inrush current such as a load is generated, fusion due to a bounce phenomenon may occur relatively large.

In order to prevent this phenomenon, it is necessary to prevent surge current, minimize excessive bounce phenomenon and contact resistance, increase the contact pressure and contact opening pressure of the contact, and select appropriate contact material.

When using not only resistive load but also excessive load (motor, lamp load), heat generated at the contact surface due to arc generated at the contact point may cause fusion phenomenon that the contact point is adhered unexpectedly. In this way, when the fusion of the contacts occurs, since the control is not performed in a state where the contacts (fixed contacts, movable contacts) are fixed, the manager recognizes the problem through a warning sound or a visual device warning of various risks, It is necessary to secure a reliability by providing a control system which can solve itself.

FIG. 2 is a flowchart illustrating a relay contact fusion warning method using a relay contact fusion warning system according to an embodiment of the present invention.

In step 201, the relay contact fusion warning system can acquire change data according to the control through a current transformer (CT).

In step 202, the relay contact fusion warning system can analyze the obtained change data to determine whether or not the relay is abnormal.

The method for determining whether or not the relay is abnormal can be determined by comparing the presence or absence of the signal transmission of the control unit and the current transformer for confirming whether or not the current is energized to determine whether the relay is abnormal.

If an error occurs in the relay in step 203, the relay contact fusion warning system can notify the system manager of the relay status.

In other words, when the fusing phenomenon of a contact occurs, since the control is not performed in a state where the contact (fixed contact, movable contact) is fixed, the system administrator can recognize the problem through a warning sound or a visual device can do.

In step 204, when the cause of the occurrence of the abnormality is a fusion phenomenon, the relay contact fusion warning system can secure the contact normal state of the relay itself in the system. Here, the fusion phenomenon is a phenomenon in which heat is generated on the contact surface due to an arc generated at the contact of the relay when an excessive load (motor, lamp load) is used as well as a resistance load on the relay.

The method of securing the contact point of the relay can apply a voltage equal to or greater than the voltage applied to the relay. In other words, by applying a voltage higher than the voltage applied to the relay, judging whether or not the relay is in the normal state of the contact, and then keeping the contact state of the relay off, have.

In this manner, a control system that can solve the fusing phenomenon of the relay itself can be provided, and the reliability of the apparatus and system to which the relay is ultimately applied can be ensured.

3 is a flowchart for explaining an example of a relay contact fusion warning method according to an embodiment of the present invention.

Referring to FIG. 3, a relay contact fusing warning method using the relay fusing warning system described with reference to FIG. 2 will be described.

In step 301, the relay contact fusion warning system may transmit the relay state data via a current transformer (CT).

In step 302, the relay contact fusion warning system can grasp the amount of current according to the control.

Thus, in step 303, it is possible to determine whether the relay is abnormal by acquiring and analyzing the change data under control. At this time, if there is no abnormality in the relay, the relay status data can be transmitted again. If an abnormality occurs in the relay, the fault type of the relay should be determined as in step 304.

In step 305, it can be determined whether or not the type of failure of the relay is contact fusion. If the type of failure of the relay is a simple failure (off state) as in step 306, the type of failure is notified to the system administrator and the process is terminated.

When the type of the failure of the relay is the contact fusion (on state) as in step 307, the type of failure can be notified to the system administrator first. Thereafter, in step 308, a voltage higher than the voltage previously applied to the relay may be applied. In other words, a voltage equal to or greater than the voltage applied to the relay can be applied.

In step 309, it is possible to determine whether the contact of the relay has recovered to a normal state or to apply a higher voltage to the relay if the contact state is not recovered.

When the normal state of the contact is recovered as in step 310, the relay control can be stopped and the relay can be kept in the off state.

The relay contact welding warning method will be described with reference to a relay using a solenoid device.

First, in order to check the operation state of the relay, it is possible to analyze through signal comparison of a current transformer (CT) which can confirm whether or not the control unit transmits a signal and whether current is supplied or not.

In addition, a solenoid can be used to drive the relay to change the position of the contact to construct a circuit. Here, the solenoid is a device made by tightly winding a wire in a cylindrical shape and can be used while controlling the current. The magnetic field generated by one strand of wire is very weak, but when the wire is formed into a coil shape, a large magnetic force may be generated because the magnetic force is concentrated. The intensity of the internal magnetic force generated by the solenoid coil becomes larger in proportion to the number of turns of the coil and the intensity of the current.

When the solenoid device is applied to directly control the contact of the relay, the solenoid force can be changed according to the intensity of the current since the type and number of revolutions of the structure of the manufactured solenoid are determined. In a typical relay, a control device is determined to input AC24V. When a high voltage is applied in a state where the resistance of the solenoid device is constant, more current flows and more force is applied to the solenoid itself.

Therefore, when the control system determines the problem in the state where the contacts of the relay are welded and then attempts to control the relay contact state to the off state, The larger the force must act on the contacts. In this case, by applying a voltage higher than AC24V by itself in the system, the solenoid can temporarily apply a high mechanical force to return the fusion state to a normal state. Accordingly, the relay contact state can be turned off, thereby minimizing the problem caused by fusion.

4 is a block diagram illustrating a relay contact fusion alarm system according to an embodiment of the present invention.

Referring to FIG. 4, the relay contact fusion warning system 400 may include a detection unit 410, a signal unit 420, and a control unit 430. These relay contact fusion warning systems can be connected to relays and circuits.

The detecting unit 410 electrically detects the fusion state, and can acquire change data according to the control through a current transformer (CT) for the instrument, and can detect the fusion state of the relay. This can be analyzed through comparison of the instrumental current transformer to check whether the control system has signal transmission and whether or not the current is energized.

The signal unit 420 may notify the system administrator of the state of the relay when an error occurs in the relay. When the fusion of contact occurs, it is not possible to control the contact (fixed contact, movable contact) in a fixed state, so that the system administrator can recognize the problem through a warning sound or a visual device warning of various risks .

If the cause of the abnormality is a fusion phenomenon, the control unit 430 can secure the contact normal state of the relay by changing the electrical signal sent to the relay. In other words, the control unit 430 can apply a voltage higher than the previous voltage applied to the relay by itself to turn off and maintain the normal contact state of the relay.

Therefore, according to the embodiments of the present invention, an accident can be prevented in advance by first recognizing an error of the system and recognizing whether or not the user has a failure, and secondly, the voltage applied to the relay itself Thus, the problem caused by the contact fusion of the relay can be minimized.

As a result, an accident caused by the continuous operation of the machinery due to the continuous current flow due to the fusion of the relay can occur beforehand, so that the system administrator can quickly identify the related problem, Proper measures can be taken to ensure overall device reliability.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, controller, arithmetic logic unit (ALU), digital signal processor, microcomputer, field programmable array (FPA) A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing apparatus may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

400: Contact fusion welding warning system
410:
420: Signal section
430:

Claims (5)

delete In relay contact fusion welding warning system,
A detecting unit for obtaining change data according to the control through a current transformer (CT) and detecting a fusion state of the relay;
A signal unit for notifying the system administrator of the status of the relay when the relay is abnormally generated; And
When the cause of the occurrence of the abnormality is a fusion phenomenon, a control section for securing the contact normal state of the relay by changing the electrical signal sent to the relay
Lt; / RTI >
The control unit
And a voltage equal to or greater than the voltage magnitude applied to the relay is applied so as to secure recovery of the contact normal state of the relay
The relay contact fusing warning system. delete A relay contact welding warning method using a relay contact welding warning system,
Acquiring change data according to a control through a current transformer (CT);
Analyzing the change data to determine whether the relay is abnormal;
Notifying a system administrator of the status of the relay when the relay is abnormally generated; And
Securing a contact normal state of the relay in the system when the cause of the abnormality is a fusion phenomenon
Lt; / RTI >
The step of securing the contact normal state of the relay
Applying a voltage greater than a voltage magnitude applied to the relay;
Determining whether a normal contact state of the relay is recovered; And
Maintaining the contact state of the relay in an off state
Wherein the relay contact fusing warning method comprises: A relay contact welding warning method using a relay contact welding warning system,
Acquiring change data according to a control through a current transformer (CT);
Analyzing the change data to determine whether the relay is abnormal;
Notifying a system administrator of the status of the relay when the relay is abnormally generated; And
Securing a contact normal state of the relay in the system when the cause of the abnormality is a fusion phenomenon
Lt; / RTI >
The step of determining whether the relay is abnormal
And analyzing the presence or absence of the signal transmission of the control unit and the current converter of the instrument capable of confirming whether or not current is conducted to determine whether the relay is abnormal
Wherein the relay contact fusing warning method is characterized by:

Images