KR101578557B1 - Apparatus for monitoring relay - Google Patents

Abstract

The relay monitoring apparatus according to the present invention may include at least one relay main body that performs relay operation, a relay unit to which all of the relay main bodies are connected, a display unit that is connected to the relay unit and displays a relay operation state of the relay main body selected from the relay main body, And an HMI formed separately from the relay main body.

Relay, HMI, Display, Relay, Communication

Description

Apparatus for monitoring < RTI ID = 0.0 > relay &

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay monitoring apparatus, and more particularly, to monitor and control the operation and state of a protection relay.

A protective relay is a device that has a command function to disconnect a circuit when an abnormal condition such as a short circuit or an eddy current occurs in an electric circuit.

 A simple example is an eddy current relay that, when eddy current flows, commands to open a circuit breaker within a few seconds to several tens of seconds depending on the degree of eddy current. This means that the disc is equipped with a rotating disc in the relay, but when the eddy current flows, the disc begins to rotate, and the contact set on the disc axis is closed, ) Eddy current relay.

There are many types of protective relays, such as undervoltage relays that operate when the circuit voltage drops, a thermometer that detects dangerous temperatures, a power relay that operates when the circuit to which power is to be sent is ready, A differential relay that operates when there is an abnormality in the current ratio of the primary and secondary of the transformer, and a ground relay that notifies the ground fault of the transmission / distribution line, etc. .

 The motor protection relay, which is an example of a protective relay, is a device that functions to reliably protect the motor by accurately detecting the overcurrent, phase, phase unbalance and reverse phase generated during starting and operation of the motor by the set operation time.

The motor protection relay converts the current of the motor through a current transformer and outputs the converted output. When the converted output value is abnormal, the relay is driven to open the closing contact to disconnect the electric power supplied to the motor through the closing contact, Thereby preventing burn-out and protection.

In recent years, factory automation systems have been actively developed in various industrial fields. As a result, line control is becoming electronic by motor drive. Therefore, devices for motor protection are becoming more important, diversification of products, high function and mass production system are developed have.

SUMMARY OF THE INVENTION The present invention is directed to providing a relay monitoring device that can easily perform monitoring for one or more relays.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

According to an aspect of the present invention, there is provided a relay monitoring apparatus comprising: at least one relay main body for performing a relay operation; A relay unit to which all of the relays are connected; And an HMI connected to the relay unit for displaying a relay operation state of the relay main body, performing control of the relay main body, and formed separately from the relay main body.

In this case, the relay unit and the HMI may be integrated. In this case, the relay main body includes a relay communication unit that performs communication with the relay unit. The relay unit includes a relay unit And a communication unit.

The relay main body includes a relay communication unit for performing communication with the relay unit. The HMI includes an HMI communication unit that performs communication with the relay unit. The relay unit communicates with the relay main unit and the HMI And a relay communication unit for performing the relay communication.

The HMI unit may include an external interface connectable to an external device.

As described above, the relay monitoring apparatus according to the present invention can monitor one or more relays through a single HMI, and is simple in facility and easy to monitor the relay.

In describing the technique of the present invention, a current transformer, which is a device for obtaining a small current proportional to a large current, and another current transformer, will be unified into a current transformer.

Hereinafter, a protective relay related to the present invention will be described in detail with reference to the drawings.

1 is a front view showing a configuration of a motor protection relay as an example of a protective relay related to the present invention.

A part of the motor protection relay shown in the figure corresponds to the outer shape of a measuring unit provided with a current transformer and the like, and an operation power applying unit 112 and a plurality of output contacts 111 are provided at an upper part of the front face.

The measuring unit constructed as described above can be installed by applying a through relay (a main circuit wiring connected to the motor and the relay side through wiring through-hole 115). Alternatively, the measuring unit 110 may be provided independently or may be connected to the measuring unit 110 by single-unit connecting means (connecting the wirings of the motor and the relay through the terminals fixed to the front and rear surfaces of the body respectively) It can be applied as a through type, terminal type, or direct type relay by selectively coupling the means (connecting the motor wiring to the fixed terminal and directly connecting to the relay through the connecting pin formed in the relay) according to the installation environment of the relay .

The measuring unit may include a step-up unit for performing the relay operation, but the step-up unit may be separately configured in consideration of various matters.

Accordingly, the protective relay includes a measuring unit such as the measuring unit of the motor protection relay shown in FIG. 1, a relay unit performing the relaying operation, various circuits, and a heat dissipating unit for dissipating heat generated in the relay unit. Therefore, the outer shape of the protective relay may be shaped like a large iron case as shown in FIG.

2, it is necessary for the protection relay to display the state of the protection relay to the user in the case where each element is provided in one case 120 or each of them takes a different form, It is necessary to control the relay operation.

Therefore, it is preferable that the user is provided with a display means for displaying the state of the protection relay, and an HMI (Human Machine Interface) equipped with an input means for controlling by the user.

The HMI means a human-machine interconnection means a tool that can more easily facilitate access between the machine and the user, and the HMI used in the protection relay is as shown in FIG.

The HMI 150 is provided with a display 151 for displaying the status of the protection relay and an input unit 153 for controlling the relay operation of the protection relay. The HMI is formed integrally with the case 120 provided with the elements of the protective relay described above. Since the protective relay is generally installed together with other members such as the switchboard rather than being installed alone, it may be stored in a separate cabinet 130 in order to minimize the interference with other members during the maintenance and maintenance of the switchboard. It is preferable that a certain space for installing the cabinet in the switchboard is secured and the protective relay can be easily separated from the switchboard at the time of maintenance.

In the above description, the protective relay is described separately from the HMI. In the following description, the protection relay with the HMI is referred to as the relay main body, for convenience of explanation. The configuration including the relay main body and the HMI will be referred to as a protection relay.

4, the protection relay includes a measurement unit 211, a relay unit 213, a shared memory 215, an HMI control unit 217, a display 218, and an input unit 218. [ (219).

The measuring unit 211 is an element for measuring a voltage or a current using a measuring device such as a current transformer.

When an abnormality occurs in the voltage or current value measured by the measuring unit 213, the relay unit 213 performs a relay operation to prevent breakage of the protection target device. To this end, the relay unit 213 should include a relay determination unit (not shown) that can determine whether an abnormality has occurred in the measured value from the measurement unit. For the normal operation of the relay determination unit, a memory is required because existing data and a processing routine for comparing the measured value with the measurement unit are required. The shared memory 215 mentioned above is used for this purpose.

The HMI control unit 217 controls the operation of the HMI. The HMI control unit 217 is responsible for the display control and analyzes the control input from the user through the input unit and transmits the analyzed control to the control unit. Since the HMI controller also requires processing routines and the like, a memory for storing the processing routine is required, and the above-mentioned shared memory is used for this purpose.

The display 218 displays an operation state of the relay unit to the user or displays a measurement value of the measurement unit. The display unit 218 may be an LCD (Liquid Crystal Display) or an 8-segment, an OLED (Organic Light Emitting Diodes) Emitting Diodes).

The input unit 219 receives the control of the calculator from the user or receives the adjustment of the display state of the display from the user. The input unit 219 may include a push switch, a touch screen, or the like.

Through the above-described configuration, the relay operation state of the relay main body can be accurately recognized by the user, and control over the relay main body can be performed directly.

However, since the relay main body and the HMI are integrally formed, maintenance difficulty is expected. Preferably, the HMI is located at a location where the user can verify the display or control via the input, and the outer surface of the cabinet generally corresponds to this location. However, it is difficult to provide the HMI to be exposed outside the cabinet considering the cabinet with the hinged cover. Even if it is installed in the cabin, if the cabinet door of the cabin is opened, the HMI should be installed on the user side. That is, in the case of a protection relay in which the relay main body and the HMI are integrally formed, there may be restrictions on facilities and maintenance. In addition, an error due to a memory collision may be caused by forming a necessary memory in the summing unit and the HMI control unit into a mutually usable shared memory.

5 is a schematic diagram showing a protective relay related to the present invention.

Referring to FIG. 5, the protection relay includes a relay main body 320 performing a relay operation, and an HMI 350 detachable from the relay main body.

The HMI must be equipped with means capable of transmitting signals to and from the relay main body to control the relay operation of the relay main body and display the status of the relay main body. Of course, the relay unit must also be equipped with means capable of signal transmission with the HMI.

6, the relay main body includes a relay communication unit 414 that transmits a status display signal to the HMI and receives a relay operation control signal from the HMI, and the HMI is a relay An HMI communication unit 415 for transmitting an operation control signal to the relay main body and receiving a status display signal from the relay main body. The other components have been described above, so a detailed description is omitted.

In addition to the relay communication unit, the relay main body includes a measurement unit 411, a relay unit 413, and the like. The memory required by the relay unit is composed of a memory used only in the relay main body.

The HMI includes an HMI control unit 417, a display 418, an input unit 419 and the like in addition to the HMI communication unit. The memory required by the HMI control unit includes a memory used only by the HMI itself.

The communication between the relay communication unit and the HMI communication unit may be implemented by various wired / wireless communication methods. For example, it can be applied to Ethernet, Bluetooth, and infrared communication.

5, when the HMI is mounted on the relay main body, it is preferable to perform easy mounting by providing connectors that are engaged with each other. When the communication method of the HMI communication unit and the relay communication unit is wireless, I do not. As a matter of course, mechanical attachment and support means for mounting the HMI reliably in the relay main body, and guide means for guiding the mounting if necessary can be formed.

When the HMI is separated from the relay main body and installed in a power distribution box and the signal transmission is performed by a wired communication method, the signal wiring 370 between the relay and the HMI is also provided with a separate connector 371 as shown in FIG. It is desirable to make the connection possible. This is because it is advantageous for the equipment work to connect the signal wiring after mounting the HMI in the mechanism to support the HMI when the HMI is separated from the relay body. Further, by taking the connector structure, it is also possible to directly connect the relay main body to a control computer, not to the HMI. 7 shows an example in which the HMI performs connection with the control computer. In this case, the HMI must form an HMI communication unit so as to simultaneously perform communication with the relay main body and the control computer 390. [ The communication between the HMI and the control computer is also capable of wired / wireless communication. Although the wired communication method is used in Fig. 7, it is preferable for the user to perform wireless communication such as infrared rays.

Communication between the HMI and the relay main body may be performed through fixedly connected signal wires. In such a case, it is preferable that the signal wiring housing portion is formed in the HMI or the relay main body so that the signal wiring is not projected to the outside when mounted. In the case of the signal wiring using the connector as described above, it is also advantageous to maintain the signal wiring by forming the signal wiring housing part considering the use of the signal wiring later.

According to the above configuration, the HMI is detachably attached to the relay main body, the facilities of the relay main body and the HMI are more freed up, and the HMI can be installed in a position exposed to the user. Therefore, this function of the HMI can be easily enjoyed by the user, and the memory can be formed in each of the HMI and the relay main body by the removable structure, thereby preventing errors due to the memory collision.

8 is a schematic diagram showing a relay monitoring apparatus according to a preferred embodiment of the present invention.

The protection relays shown above are of a detachable structure with a 1: 1 correspondence between the relay main unit and the HMI. Therefore, in the relay monitoring apparatus to which a plurality of relay main bodies are applied, the number of HMIs must also be provided for the number of relay main bodies. If multiple HMIs are installed, it is not possible to simultaneously monitor multiple HMIs, and the HMI of the protection relay that is not currently being monitored becomes an unnecessary resource state. That is, since the number of HMIs that can be monitored and managed by a user at a certain point in time is limited, an HMI that is not currently monitored and managed becomes an unnecessary element. These unnecessary HMIs cause an increase in equipment costs and an increase in maintenance costs, and there are difficulties in identifying HMIs located in various locations during relay monitoring.

Referring to FIG. 8, it is assumed that one or more relay main bodies 620 for performing relay operations, a relay unit 670 to which all of the relay main bodies are connected, and a relay operation unit connected to the relay unit, And a HMI 650 formed separately from the relay main body.

The relay main body 620 includes various circuits such as a measuring unit, a relay for performing the relaying operation, a control unit, and the like, and also includes a heat dissipating unit for dissipating heat generated by itself.

The relay unit 670 is an element to which the relay main body is connected, and all of the relay main bodies are connected. Therefore, the relay unit receives or transmits all the signals processed by the relay main body.

The HMI is provided separately from the relay main body, and is provided with only one individual entity, and is connected to the relay section to process and communicate signals related to the selected relay main body.

The relay unit may restrict communication with the relay main body by the HMI. For example, when the HMI wants to perform communication by selecting any relay main body at a point in time, it is necessary to restrict communication with a relay main body other than the relay main body in which the HMI is interested. A transmission prohibition signal requesting the relay unit not to transmit a signal is generated under the control of the HMI and is transmitted to a relay body other than the target of interest so that signal transmission from the relay body to the relay unit can be restricted. Of course, the transmission prohibition signal may be generated in the HMI and transmitted to the relay body other than the object of interest via the relay unit. Alternatively, it is also possible to perform signal transmission in the relay main body selected by the transmission request signal requesting to perform communication with the relay main body of interest in the HMI based on not performing signal transmission in the relay main body have. Also in this case, the transmission request signal may be generated in the relay unit under the control of the HMI, or may be directly generated in the HMI and transmitted through the relay unit. In this case, the HMI functions as an HMI for only one relay main body at a certain point in time, and the relay unit sets a communication path to the selected relay main body among the plurality of relay main bodies. Therefore, when the communication path is set by the relay unit in this way, it is also possible to transmit the control signal from the HMI to the selected relay main body. However, it is preferable that the user can be notified when a problem occurs in the relay main body. Therefore, even if the relay main body is not set to the communication path, the relay status can be transmitted to the HMI so that the user can recognize the occurrence of a problem.

In some cases, the selected relay main body may be plural. To further expand, the selected relay body may be all of the installed relay bodies.

In this case, the HMI needs to separately transmit the control signal to be transmitted to the selected relay main body and the control signal to be transmitted to each relay main body, and accordingly, the communication path in the relay unit must be properly set. For this purpose, certain communication means should be applied between the relay main unit, relay unit and HMI. The communication means may be wired or wireless communication means. For example, it is preferable to form a LAN by applying Zigbee, Ethernet or the like.

On the other hand, the HMI must configure the display so that a selected plurality of relay bodies can be displayed. For example, the screen of the display can be divided by the number of selected relay bodies. However, in view of the display size of the HMI, it may not be desirable to divide and display the display screen into a large number of screens. Therefore, instead of displaying the selected plurality of relay main bodies at the same time, it is preferable to divide the screen into a predetermined number that is easy to read, and then change the relay displayed in a predetermined time unit, that is, display it in a circulating manner. The number of divided screens can be set in consideration of the display size of the HMI, etc., and the state of the selected relay main body can be alternately displayed at regular intervals without splitting the screen.

The selection of the relay main body desired by the user among the plurality of relay main bodies can be performed by the operation of the input unit of the HMI. An identifier such as a serial number is added to each relay main body so that the user can easily select the relay main body desired by the user .

In addition, the identifier of the relay main body can be displayed as a menu on the display of the HMI, and an indicator capable of moving on the display can be configured to select the menu.

On the other hand, the relay unit must have communication ports as many as the number of relays to be connected. If the number of relay units is limited to a certain number or less, the relay unit may be disposed in the HMI. That is, the relay unit and the HMI can be formed integrally. In such a case, the configuration may be simplified, but if the number of relays is large, disadvantages may arise in expanding the communication port.

In order to transmit signals between the relay main unit, the relay unit, and the HMI, the relay main unit may include a relay communication unit for performing communication with the relay unit, and the relay unit may include a relay unit communication unit for performing communication with the relay communication unit . The relay communication unit may be configured to communicate with the HMI communication unit, and the HMI communication unit may communicate with the relay communication unit.

If the HMI and the relay unit are integrally formed, no separate communication means is required between the relay unit and the HMI. Of course, it is natural that an internal wiring connection should be made.

On the other hand, there is a need to be connected to a separate management computer for the specific control of the relay main body, the update of the processing routine, and the like.

In this case, the management computer is usually directly connected to each relay main body to perform the operation. It is troublesome to manage each relay main body by connecting directly to each relay main body, so it is desirable to be able to perform it easily through the HMI mentioned above.

To this end, it is preferable that an external interface 651, which can be connected to an external device, is formed in the HMI 650 as shown in FIG. 9, and each relay main body can be managed using the external interface. That is, by connecting the management computer 690 to the external interface formed on the HMI, all of the relays connected through the HMI and the relay unit can be managed.

The external interface may be a wired or wireless communication supporting method, for example, infrared wireless communication, Bluetooth, USB, or the like.

As described above, the relay monitoring apparatus according to the present embodiment can manage one or a plurality of relays through one HMI. This makes it possible to reduce the facility cost and facilitate management from the user's perspective.

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. In addition, it will be understood by those of ordinary skill in the art that various embodiments are possible within the scope of the technical idea of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a configuration of a motor protection relay as an example of a protection relay related to the present invention. FIG.

Fig. 2 is a perspective view showing a case surrounding the relay main body of the protection relay. Fig.

3 is a perspective view showing an HMI integral type protective relay.

4 is a block diagram showing the configuration of an HMI integral type protective relay.

5 is a perspective view showing a protection relay related to the present invention.

6 is a block diagram showing a configuration of a protection relay related to the present invention;

7 is a schematic view showing a signal wiring connection state of a protective relay related to the present invention.

FIG. 8 is a schematic view of a relay monitoring apparatus according to a preferred embodiment of the present invention. FIG.

FIG. 9 is a schematic view of a relay monitoring apparatus according to another preferred embodiment of the present invention. FIG.

Description of the Related Art [0002]

620 ... Relay body 650 ... HMI

670 ... relay unit

Claims (6)

delete delete delete delete A plurality of relay main bodies provided with a current transformer and having at least a measuring section for measuring a current of a measurement object and a relay section for performing a relay operation with respect to the measurement object when an abnormality of a current measured by the measurement section occurs; A relay unit to which all of the relays are connected; And And an HMI connected to the relay unit for displaying a relay operation state of the selected relay main body of the relay main unit and generating a transmission prohibition signal or a transmission request signal to control the relay unit, The relay unit controls communication with the relay main body under the control of the HMI, Wherein the relay unit transmits the transmission prohibition signal to the plurality of relay bodies to limit signal transmission from the relay body of the relay body to the relay unit. A plurality of relay main bodies provided with a current transformer and having at least a measuring section for measuring a current of a measurement object and a relay section for performing a relay operation with respect to the measurement object when an abnormality of a current measured by the measurement section occurs; A relay unit to which all of the relays are connected; And And an HMI connected to the relay unit for displaying a relay operation state of the selected relay main body of the relay main unit and generating a transmission prohibition signal or a transmission request signal to control the relay unit, The relay unit controls communication with the relay main body under the control of the HMI, And when the relay unit receives the transmission request signal, transmits a signal only to a selected relay main body among the plurality of relay main bodies.

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