WO2009101714A1

WO2009101714A1 - Control center

Info

Publication number: WO2009101714A1
Application number: PCT/JP2008/060552
Authority: WO
Inventors: Toshihiko Miyauchi
Original assignee: Mitsubishi Electric Corporation
Priority date: 2008-02-14
Filing date: 2008-06-09
Publication date: 2009-08-20
Also published as: CN101946380A; TWI378618B; KR20100064390A; TW200935694A; JP4932009B2; JPWO2009101714A1

Abstract

In a control center (1), a control unit (5) having a main circuit device for switching a load, a protection control device for protecting the load, and a display unit (10) for displaying the state of the load is housed in a unit chamber (3) defined in multiple stages in a box (2), and the display unit (10) can be seen from the outside of the box (2). In the control center (1), the display unit (10) comprises a liquid crystal display unit (12) comprising a liquid crystal display element equipped with a backlight. The backlight is turned white at normal time and turned orange at the time of generation of a defect.

Description

Control center

The present invention relates to a control center that performs start-up control and protection of a motor used in a power plant or the like, and more particularly to a display unit that displays a load state thereof.

The control center is a device in which a main circuit switch, a protective device, a monitoring control device, and the like are collectively assembled into a closed outer box.
FIG. 4 is a perspective view showing an example of a conventional control center, and FIG. 5 is a perspective view of a control unit housed inside. As shown in FIG. 4, the inside of the box 21 of the control center is divided into a plurality of upper and lower stages to form a plurality of unit chambers, and an opening / closing door 22 is provided in front of each unit chamber. . A control unit 23 is housed in the unit chamber so that it can be pulled out from the front.

As shown in FIG. 5, the control unit 23 contains main circuit equipment such as an electromagnetic switch and a transformer, including a circuit breaker 25 for ON / OFF switching of the main circuit power supply, inside the frame 24. On the front side of the frame body 24, a monitoring control instrument such as a display lamp 26 and an operation switch for displaying an operation status is arranged.
In the state in which the control unit 23 is housed in the unit chamber of the box body 21, the opening / closing door 22 has an opening / closing door 22 so that the operation handle of the circuit breaker 25, the display lamp 26 can be monitored, and the operation switch can be operated. A notch window 22a is provided (see, for example, Patent Document 1).

JP-A-10-293601 (page 2-3, FIG. 1 and FIG. 3)

Since the control unit 23 is required by the number of loads to be controlled, normally, as shown in FIG. 4, a plurality of control centers are arranged in a horizontal row, and depending on the scale, a plurality of rows are arranged. The whole is configured.
In the conventional control center as described above, when an abnormality occurs in the load to be controlled, the display lamp 26 of the control unit 23 is turned on or blinked to notify the operator of the abnormality. When the number of loads to be controlled is very large, the number of control units 23 in the control center is also very large. Therefore, even if the display lamp 26 is lit or blinked to notify an abnormality in any of the control units 23. There is a problem in that it is very difficult to immediately determine the control unit from among the many control units 23.

The present invention has been made to solve the above-described problems, and provides a control center that can easily determine a control unit that notifies a load abnormality from among a large number of control center control units. The purpose is to do.

In the control center according to the present invention, a control unit having a main circuit device for opening / closing / protecting a load, a protection control device, and a display unit for displaying the state of the load is housed in a unit room divided into multiple stages in a box. In a control center configured so that the display unit can be seen from the outside of the box, the display unit has a liquid crystal display element with a backlight so that the color of the backlight changes depending on whether it is normal or abnormal. It is configured.

According to the control center of the present invention, the display unit of the control unit constituting the control center includes a liquid crystal display element with a backlight, and is configured to change the color of the backlight between when it is normal and when an abnormality occurs. When an abnormality occurs in the load to be controlled, it is possible to easily identify the abnormally displayed control unit from among a large number of control center control units, so that the load abnormality can be dealt with promptly. it can.

It is a partial front view which shows the control center in Embodiment 1 of this invention. It is a figure which shows the display part with which the control unit accommodated in the control center of FIG. 1 is equipped. It is a figure which shows the liquid crystal display part of FIG. It is a perspective view which shows the conventional control center. It is a perspective view of the control unit accommodated in the control center of FIG.

Embodiment 1 FIG.
FIG. 1 is a partial front view of a control center according to Embodiment 1 of the present invention. The entire configuration of the control center is the same as that shown in FIG. FIG. 1 corresponds to an enlarged portion of some of the control units arranged in multiple stages in the control center shown in FIG.

Referring to FIG. 1, the control center 1 has a box body 2 as an outer box divided into a plurality of sections, and unit chambers 3 having openings on the front are formed in multiple stages. An opening / closing door 4 is provided at the front opening of each unit chamber 3 so that the unit chamber 3 can be opened and closed, and a control unit 5 is accommodated in the unit chamber 3 so as to be drawn out. The figure shows two stages of the control units 5 housed in a plurality of stages, and the upper part shows the front part of the control unit 5 housed in the unit chamber 3 by opening the door 4. The lower part shows the state where the door 4 is closed.

Protection control housed in the case with an operation handle 7a of the circuit breaker 7 for turning on / off the main circuit power supply and electronic parts such as an electronic relay and CPU as devices that can be seen from the front when the door 4 is opened Although a relay 8 and a terminal block 9 for connecting a control line are shown, main circuit equipment such as an electromagnetic switch and a control transformer, and protection control equipment such as a current sensor are further provided on the back side. However, these are arranged and supported and fixed in the frame 6, and the control unit 5 is constituted by these. However, the equipment and components to be accommodated vary depending on the load to be controlled and the function of the unit. On the front side of the protection control relay 8, a display unit 10 for displaying a load state is provided.
When the opening / closing door 4 is closed, the operation handle 7a of the circuit breaker 7 can be operated from the outside, and the window corresponding to the operation handle 7a and the display unit 10 of the opening / closing door 4 is visible so that the display unit 10 can be visually recognized. 4a is open.

FIG. 2 is an enlarged view of the display unit 10, and shows a portion that can be seen from the outside of the opening / closing door 4.
The display unit 10 includes an LED display unit 11 that displays operation states such as operation, stop, failure, and transmission abnormality, and a liquid crystal display unit 12 that displays main circuit current, trip current, error code, failure factor, and the like. Yes. The liquid crystal display unit 12 includes a liquid crystal display element 13 with a backlight.
Moreover, although it is the switch part 14 by which the control switch and mode switches are arrange | positioned at the lower part side of the display part 10, since it is not the main part of this invention, description is abbreviate | omitted.

FIG. 3 is a diagram showing details of the liquid crystal display unit 12 of FIG. The liquid crystal display unit 12 displays, for example, a large main circuit current value during normal operation, and a trip current value when an abnormality such as a trip occurs in the load.
The type of the liquid crystal display element 13 is an STN (Super Twisted Nematic) type.
The light and dark display by the liquid crystal display element 13 is a negative display in which the character portion 13a is brightly displayed and the background portion 13b outside the character portion is darkly displayed. Furthermore, there are two types of backlight colors, white and orange. (Note that the character part includes symbols, etc.)

During normal operation, the backlight is turned on in white, and the character portion 13a is displayed in white by the transmitted light. At this time, the color of the background portion 13b other than the character portion is a blue color peculiar to the STN type, and looks bright blue by the backlight.
When an abnormality occurs in the load and notification is made, the backlight is changed to orange, and the character portion 13a is displayed in bright orange by the transmitted light. At this time, the color of the background portion 13b other than the character portion is blue and the orange color of the backlight, and becomes a bluish dark orange color.
In FIG. 3, the character portion is illustrated by the segment method, but may be a dot matrix method.

Next, the operation of the display unit 10 configured as described above will be described.
As described with reference to FIG. 4 in the background section, the control center 1 has a plurality of control centers arranged in a horizontal row (table), and in a large-scale power plant or the like, A plurality of rows are arranged before and after. In many cases, for example, there are cases where 10 or more rows arranged in the horizontal direction are arranged beyond 10 rows. Inside the box 2 of each control center 1, the control units 5 are accommodated in multiple stages, and since the display units 10 are provided for each control unit 5, a very large number of display units 10 are arranged in an orderly manner. Will be. During operation, the operator monitors the display unit 10 of each control unit 5 while patrolling the path between the control centers 1 arranged in a row, and performs load operation control and maintenance / inspection.

If an abnormality occurs in the load, the display unit 10 of the control unit 5 notifies the abnormality. However, as described above, the control unit 5 that has displayed an abnormality from among a large number of display units 10 is arranged. In order to find out quickly, it is desirable that the display unit be visible from as far as possible. In the conventional control center, the abnormality is mainly notified by the blinking of the lamp of the LED display unit or the like. However, since the LED display unit is a small point light source, in the control center group having a large number of display units 10 as described above, It is difficult to quickly find an abnormal display on the display unit 10 of the control unit 5 located far from the remote control unit 5.

For this reason, in the first embodiment of the present invention, the liquid crystal display unit 12 is a liquid crystal display element 13 with a backlight, and the color of the backlight is changed and displayed in the event of an abnormality. That is, when an abnormality occurs, the failure lamp of the LED display unit 11 is turned on or blinked on the display unit 10 of the control unit 5, and the liquid crystal display unit 12 displays, for example, a trip current value, and further turns the backlight white. Switch from orange to orange. By doing so, the worker can quickly find the abnormal control unit 5 from a great number of the display units 10 and can deal with it quickly.

Here, it will be described that the STN type is adopted for the liquid crystal display element 13, the light and dark display is negative display, and the backlight color is white and orange.
The control center is an open / close control device that concentrates loads of a large number of electric motors, etc. to open, close, control, and protect, and is required to have high reliability so that it can be used stably for a long period of time. Therefore, the liquid crystal display unit 12 must also have a long life and high reliability. For this reason, a TN (Twisted Nematic) type has been widely used as a liquid crystal display element so far. There was a drawback that the corners were narrow. When viewing the display unit 10 of the control center 1 placed in a row from a remote location, it is viewed from an oblique direction, so it is desirable that the viewing angle of the liquid crystal display unit 12 be as wide as possible.
Therefore, the STN type, which has a long life like the TN type and has a wider viewing angle than the TN type, was adopted. This makes it possible to obtain the display unit 10 that can be viewed from a distance while maintaining a long life and high reliability.

In addition, as a result of experimenting with various combinations of positive display and negative display and backlight color, the negative display has better visibility than the positive display even if the brightness of the surrounding environment changes, and the backlight It was found that the combination of changing from white (normal) to orange (abnormal) has good visibility of the abnormal display. That is, as the background color at the time of abnormal display, the composite color of the blue color of the STN element and the orange color of the backlight is not uncomfortable in color, high contrast is obtained, and the background color of the display unit in the normal state It turned out that it can be well distinguished from (bright blue).

In this way, by adopting white and orange backlights, the characters can be clearly seen as white characters on a light blue background during normal operation, and on a dark blue orange background when an abnormality occurs. Bright orange characters emerged, making it possible to clearly distinguish abnormal indications even from a distance, especially when abnormalities occur.
In an abnormal situation, the orange backlight may be blinked in addition to being lit. Moreover, you may combine lighting and blinking, such as blinking only the character part 13a.

As described above, according to the control center of the first embodiment, the display unit of the control unit constituting the control center includes the liquid crystal display element with the backlight, and the color of the backlight is normal and abnormal. Since there is an abnormality in the load to be controlled, it is possible to easily identify the abnormally displayed control unit from among a large number of control center control units. Can be dealt with promptly.

Also, since the liquid crystal display element type is STN type, it has a wide viewing angle, so that abnormal display on the display unit can be distinguished from a distance, and since it has a long life, high reliability is maintained. Can do.

In addition, the light and dark display of the liquid crystal display element is a negative display in which the character portion is brightly displayed and the background outside the character portion is darkly displayed. Therefore, the visibility of the display portion when an abnormality occurs is improved compared to the positive display. An easy-to-see display unit can be provided.

Furthermore, there are two types of backlight colors, white and orange. When normal, the backlight is lit white and the text is displayed in white. When an abnormality occurs, the backlight is lit orange. Since the portion is configured to be displayed in orange, the visibility of the display portion at the time of occurrence of an abnormality is increased, and it becomes easy to determine the abnormality display even from a distance, so that it is possible to quickly cope with an abnormality.

Claims

A control unit having a main circuit device for opening / closing / protecting a load, a protection control device, and a display unit for displaying the state of the load is housed in a multi-stage unit room in a box, and the display unit is In the control center configured to be visible from the outside of the box,
The control center includes a liquid crystal display element with a backlight, and is configured to change the color of the backlight depending on whether it is normal or abnormal.
2. The control center according to claim 1, wherein the type of the liquid crystal display element is an STN type.
3. The control center according to claim 2, wherein the light and dark display by the liquid crystal display element is a negative display in which the character portion is brightly displayed and the background portion outside the character portion is darkly displayed.
4. The control center according to claim 3, wherein the backlight has two types of colors, white and orange, and the backlight is turned on in white to display the character portion in white when the normal is present. The control center is configured to display the character portion in the orange color by lighting the backlight in the orange color when it occurs.