JPH0919011A - Enclosed distribution board - Google Patents

Abstract

PURPOSE: To prevent the increase in temperature in a box and lengthen a replacement cycle of fan devices by controlling a plurality of the fan devices by means of a load operating condition detecting means according to the operating condition of a load so that the working times of the fan devices may be almost the same. CONSTITUTION: In a fan storing room 4, a fan motor is installed and a first and a second fan devices 18, 19 which are constituted of fans and are driven by the fan motor are arranged left and right. A fan controlling device 20 which has a microcomputer is installed in the back of the fan storing room 4. When the first and the second fan devices 18, 19 are driven, the outside air in a box 1 is taken in from an inlet port 16 and is passed through a duct room 5, a duct section 6, and each unit storing room 3, and then is exhausted from an exhaust port 14. Each inverter device 9 is provided with a switch which also serves as a load operating condition detecting means and the output of each inverter device 9 is sent to the fan controlling device 20. By this method, the good and efficient operation is available with the increase in temperature in the box being prevented and thereby a replacement cycle of each fan device can be made longer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed switchboard equipped with a plurality of fan devices for ventilating a box containing a plurality of units.

[0002]

2. Description of the Related Art A closed switchboard, such as a control center, is used for centralized control of power plants and general industrial auxiliary equipment for the purpose of opening and closing and protecting loads such as low-voltage motors and resistive loads. The unit (unit device) is stored in multiple stages on the front side (front side) inside the box. The unit mentioned here is a main frame component of a circuit breaker and an electromagnetic contactor, an overcurrent relay, an inverter device, and the like, which are grouped into a common frame for each unit circuit.

In the conventional structure of this type of control center, the temperature inside the box rises due to the heat generation of the equipment inside the unit as the load operates, so in some cases the temperature inside the box is limited to the ambient temperature of the equipment. There was a risk of exceeding.

In order to cope with such a situation, there is provided a fan device for forcibly ventilating the inside of the box. In this device, a plurality of fan devices, for example, two fan devices are provided, and even if only one load controlled by the unit is operated, two fan devices are operated at the same time, and these fan devices allow the inside of the box body to be operated. I tried to suppress the temperature rise in the box by forced ventilation.

[0005]

However, in the conventional structure, the temperature rise in the box can be suppressed, but since the fan devices are frequently used, the replacement of the fan devices is relatively short. It was the actual situation that had to be done in.

SUMMARY OF THE INVENTION An object of the present invention is to provide a closed switchboard which can prolong the replacement cycle of the fan device while suppressing the temperature rise inside the box.

[0007]

In order to achieve the above-mentioned object, the first means of the present invention is to provide a plurality of units in a box, each unit circuit is composed of devices for opening and closing loads. In a closed switchboard that houses a plurality of fan devices that store the individual pieces and ventilate the inside of the box, load operating state detecting means for detecting the operating state of the load, and each of the above based on the detection signal of the load operating state detecting means. It is characterized in that it is provided with a fan control means for controlling the operation of the fan device and controlling the operation time of each fan device to be substantially uniform.

In this case, the load operating state detecting means may be constituted by a current detecting means for detecting a current flowing in a branch conductor for branching a current to each unit (second means), or for detecting the temperature inside the box. It can be constituted by a temperature detecting means (third means).

A fourth means is to store a plurality of units each of which is configured by grouping devices for opening and closing a load for each unit circuit in the box body, and to let air outside the box body from the intake port through the box body. In a closed switchboard equipped with a plurality of fan devices for sucking air into the box and exhausting the air inside the box to the outside of the box through an exhaust port, the current flowing in the branch conductor that branches the current to each unit Current detecting means for detecting, temperature detecting means for detecting the temperature in the box,
The operation of each fan unit is controlled based on the filters attached to the intake port and the exhaust port and the detection signal of the current detection unit or the temperature detection unit, and the operation time of each fan unit is made substantially uniform. Further, the predicted temperature predicted based on the detection signal of the current detecting means and the temperature detected by the temperature detecting means are compared, and if the detected temperature is higher than the predicted temperature, the filter is clogged. It is characterized in that it is configured to include a fan control means for detecting that.

[0010]

According to the first means, the load operating state detecting means detects the operating state of the load and controls the operation of the fan device in accordance with the operating state of the load, thereby suppressing the temperature rise in the box. However, the fan device can be operated efficiently. Further, by controlling the operating time of the plurality of fan devices so as to be substantially uniform, the load on each fan device can be reduced, so that the replacement cycle of the fan device can be lengthened.

In this case, since the magnitude of the current flowing through the branch conductor changes depending on the number of loads being operated, the amount of the current flowing through the branch conductor can be detected by the current detecting means. Know if the load is operating. Further, since the temperature inside the box changes depending on the number of loads being operated, it is possible to know how much load is being operated by detecting the temperature inside the box by the temperature detecting means.

According to the fourth means, by controlling the operation of each fan device based on the detection signal of the current detecting means or the temperature detecting means, the fan device is highly efficient while suppressing the temperature rise in the box. It becomes possible to drive. Also,
By controlling the operating time of the plurality of fan devices so as to be substantially uniform, the load on each fan device can be reduced, and the replacement cycle of the fan devices can be lengthened. Furthermore, by the fan control means,
By comparing the predicted temperature predicted based on the detection signal of the current detection means with the temperature detected by the temperature detection means, it is possible to detect that the filter is clogged when the detected temperature is higher than the predicted temperature. It is possible to notify the user that the filter is clogged.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a control center will be described below with reference to FIGS. First, in FIG. 2 and FIG. 3, four unit housing chambers 3 are vertically overlapped by partitioning a plurality of partition plates 2 in the front part inside the box body 1 which constitutes the outer shell of the control center. And the fan chamber 4 is formed at the top and the duct chamber 5 is formed at the bottom.
Further, a duct portion 6 extending in the vertical direction is formed on the right side of the unit storage chamber 3.

A unit 7 is stored in each unit storage chamber 3. The unit 7 referred to here is configured by attaching devices such as a circuit breaker 8 for wiring and an inverter device 9 to the frame 10 for each unit circuit. Unit storage room 3 inside the box 1
On the rear side, a three-phase AC branch conductor 11 for branching a current to the equipment of each unit 7 is provided.

A unit door 12 for opening and closing the unit storage chamber 3 is rotatably provided on the front surface of each unit storage chamber 3, and the duct portion 6 is also provided on the front surface of the duct portion 6.
A door 13 for opening and closing is provided rotatably. An exhaust port 14 is formed on the front surface of the fan storage chamber 4, and a filter 15 is attached to the exhaust port 14. An intake port 16 is formed on the front surface of the duct chamber 5, and a filter 17 is also attached to the intake port 16.

In the fan housing chamber 4, first and second fan devices 18 and 19 composed of a fan motor and a blower fan rotatably driven by the fan motor are arranged side by side. A fan control device 20 which is a fan control means provided with a microcomputer in the rear part.
Are arranged.

Here, the first and second fan devices 18,
When 19 is operated, as shown by the arrows in FIGS. 2 and 3, the air (outside air) outside the box body 1 flows from the intake port 16 into the box body 1.
The air sucked into the interior of the box body 1 passes through the duct chamber 5 and the duct portion 6 and the respective unit storage chambers 3, and the air inside the box body 1 is exhausted from the exhaust port 14.
Will be discharged to the outside of the box 1. As a result, the inside of the box 1 is ventilated, and the temperature rise inside the box 1 can be suppressed.

FIG. 4 schematically shows the electrical connection relationship between the load and each unit 7. In FIG. 4, the circuit breaker 8 and the inverter device 9 of each unit 7 are connected to a branch conductor 11, and four loads 21, each of which is an electric motor, are connected via the respective inverter devices 9.
22, 23 and 24 are controlled. Each inverter device 9 is provided with switches 25, 26, 27, 28 which are turned on when the inverter device 9 is activated. These switches 25 to 28 compose load operating state detecting means for detecting the operating states of the loads 21 to 24, and as shown in FIG. 5, the detection signals thereof are output to the fan control device 20. Has become. The fan control device 20 controls the first and second fan devices 18 and 19 based on the detection signals from the switches 25 to 28 as described later.

An example of the control contents of the fan controller 20 will be described with reference to FIG. In FIG. 1, the shaded portion shows the operating state. Of the four loads 21-24,
When the operation of the first load 21 is started, the switch 25
Is turned on, and the signal is output to the fan control device 20. In the fan control device 20, it can be seen that one load 21 is operated by the input of the signal of the switch 25, but the temperature inside the box body 1 is not so high only by the heat generation of the device of one unit 7. Since it does not rise, neither the first fan device 18 nor the second fan device 19 operates.

When the operation of the second load 22 is started,
The switch 26 is turned on, and the signal is transmitted to the fan control device 20.
Based on the output to the fan controller 20,
It can be seen that the two loads 21, 22 were operated. When the two loads 21 and 22 are operated, the temperature inside the box body 1 is considerably increased due to the heat generation of the devices of the two units 7, so that only one of the first fan devices 18 is operated. To start. By operating the first fan device 18,
The inside of the box 1 is ventilated, and the temperature rise inside the box 1 can be suppressed.

When the operation of the third load 23 is started,
The switch 27 is turned on, and the signal is the fan control device 20.
Based on the output to the fan control device 20, it can be seen that the three loads 21, 22, and 23 are operated in the fan control device 20. However, even if the three loads 21 to 23 are operated,
Since the temperature rise in the box body 1 is suppressed by operating only the first fan device 18, the operation of only the first fan device 18 is continued.

When the operation of the fourth load 24 is started, the switch 28 is turned on and the signal is output to the fan control device 20.
Then, it can be seen that the four loads 21 to 24 were operated. When the four loads 21 to 24 are operated, the temperature inside the box body 1 rises considerably due to the heat generation of the devices of the four units 7. Therefore, in addition to the first fan device 18, The operation of the second fan device 19 is started. As a result, the inside of the box 1 is ventilated by the first and second fan devices 18 and 19, and the temperature rise inside the box 1 is suppressed.

Of the four loads 21 to 24, one is
When the operation of one load 24 is stopped, the switch 28 is turned off, and based on this, it can be seen that the fan control device 20 has stopped the operation of one load 24. At this time,
Since only one fan device needs to be operated, the operation of the first fan device 18, which has been operating for a long time, is stopped and the second fan device 18 is stopped.
The fan device 19 is continued to operate.

When the operation of the second load 23 is stopped, the operation of the second fan device 19 is continued. And
When the operations of the remaining two loads 22 and 21 are both stopped, the operation of the second fan device 19 is also stopped.

According to the first embodiment as described above, the operation of the first and second fan devices 18 and 19 is controlled according to the number of operating loads, while suppressing the temperature rise in the box 1. Also, there is no wasteful operation of the first and second fan devices 18 and 19, and efficient operation is possible. Further, by controlling the operating times of the first and second fan devices 18 and 19 so as to be substantially uniform, it is possible to reduce the load on the individual fan devices, so that the first and second fan devices can be reduced. It becomes possible to lengthen the exchange period of 18 and 19.

6 to 8 show a second embodiment of the present invention, which is different from the above-mentioned first embodiment in the following points. That is, the loads 21 to 24
As the load operating state detecting means for detecting the operating state of, the current detecting means for detecting the current flowing through the branch conductor 11 is provided in place of the switches 25 to 28. The current detecting means is composed of a current transformer 29 (current transformer) (see FIG. 7) and a current / voltage converter 30 (see FIG. 8), and a detection signal of the current / voltage converter 30 is sent to a fan controller 31 (fan control). Means) and the fan control device 31 controls the operation of the first and second fan devices 18 and 19 based on the detection signal of the current-voltage converter 30.

An example of the control contents of the fan control device 31 will be described with reference to FIG. When the operation of the first load 21 is started, a detection signal corresponding to the current flowing through the branch conductor 11 is output from the current / voltage converter 30 to the fan control device 31. The fan control device 20 compares the detected current value based on the detection signal (the detected current is shown by hatching in FIG. 6) with a preset reference value A of one fan device operation, and detects the detected value. When the current value is lower than the reference value A, ventilation by the fan device is not required, and neither the first fan device 18 nor the second fan device 19 is operated.

When the operation of the second load 22 is started, the detected current value based on the detection signal from the current-voltage converter 30 reaches the reference value A for the operation of one fan device. Then, the fan control device 31 determines that it is necessary to operate one fan device, and starts the operation of only one of the first fan devices 18. This first fan device 1
By the operation of 8, the inside of the box 1 is ventilated and the temperature rise inside the box 1 is suppressed.

When the operation of the third load 23 is started, the detected current value based on the detection signal from the current-voltage converter 30 exceeds the reference value A for the operation of one fan device,
Since the preset reference value B of the operation of the two fan devices is not exceeded, the fan control device 31 determines that only one fan device needs to be operated, and continues the operation of only the first fan device 18.

When the operation of the fourth load 24 is started, the detected current value based on the detection signal from the current-voltage converter 30 reaches the reference value B for the operation of the two fan devices. Then, the fan control device 31 determines that it is necessary to operate the two fan devices, and the first fan device 18
In addition to this, the operation of the second fan device 19 is started. As a result, the inside of the box body 1 has the first and second fan devices 18,
Ventilation is performed by 19, and the temperature rise in the box body 1 can be suppressed.

Of the four loads 21 to 24, 1
When the operation of the load 24 of the stand is stopped, the current-voltage converter 3
Since the detected current value based on the detection signal from 0 becomes lower than the reference value B of the operation of the two fan devices, it is assumed that only one fan device is required, and the first fan device 18 that has been operating for a long time 18 Operation of the second fan device 19 is stopped.
Continue driving.

When the operation of the second load 23 is stopped, the detected current value based on the detection signal from the current-voltage converter 30 reaches the reference value A for the operation of one fan device.
Since one fan device needs to be operated, the operation of the second fan device 19 is continued. Then, when the operation of the remaining two loads 22 and 21 is stopped together, it is determined that the operation of the fan device is not necessary, and the operation of the second fan device 19 is also stopped. Also in the second embodiment, the same operation and effect as those of the first embodiment can be obtained.

9 to 11 show a third embodiment of the present invention. This third embodiment differs from the above-described first and second embodiments in the following points. That is, as the load operating state detecting means for detecting the operating states of the loads 21 to 24, the temperature sensor 32 which is the temperature detecting means for detecting the temperature in the box body 1 is provided in the box body 1. The detection signal is output to the fan control device 33 (fan control means). The fan control device 33 is configured to control the operation of the first and second fan devices 18 and 19 based on the detection signal of the temperature sensor 32.

An example of control contents of the fan control device 33 will be described with reference to FIG. In this case, the temperature inside the box 1 is constantly monitored by the temperature sensor 32, and the detection signal is output to the fan control device 33. 1st load 2
When the operation of No. 1 is started, the temperature inside the box 1 rises slightly. The fan control device 33 compares the temperature detected by the temperature sensor 32 with a preset fan operating temperature, and if the detected temperature is lower than the fan operating temperature, ventilating by the fan device is not required. Neither the first nor the second fan device 18, 19 is operating.

When the operation of the second load 22 is started, the temperature inside the box 1 further rises, and the temperature detected by the temperature sensor 32 gradually reaches the fan operating temperature. When the detected temperature reaches the fan operating temperature, the fan control device 33 determines that the fan device needs to be operated, and starts the operation of only one of the first fan devices 18. By operating the first fan device 18, the inside of the box 1 is ventilated and the temperature inside the box 1 is lowered.

When the operation of the third load 23 is started, the temperature inside the box body 1 rises again and the temperature detected by the temperature sensor 32 also rises, but the detected temperature becomes the fan operating temperature. Does not reach the first fan device 1
Continue operation of 8 only.

When the operation of the fourth load 24 is started, the temperature inside the box 1 further rises, and the temperature detected by the temperature sensor 32 eventually reaches the fan operating temperature. When the detected temperature reaches the fan operating temperature, the fan control device 33 determines that it is necessary to operate the two fan devices, and in addition to the first fan device 18, the second fan device 1
The operation of 9 is started. As a result, the inside of the box body 1 is ventilated by the first and second fan devices 18 and 19, and the box body 1
The temperature rise in the inside will decrease.

One of the four loads 21 to 24 is
When the operation of the load 24 of the table is stopped, the temperature inside the box 1 gradually decreases, and the temperature detected by the temperature sensor 32 eventually reaches the preset fan stop temperature. When the detected temperature reaches the fan operating temperature, the fan control device 33 stops the operation of the first fan device 18 that has been operating for a long time and determines that the second fan device 19 has only one fan device. Continue driving. As the operation of the first fan device 18 is stopped, the temperature inside the box 1 rises again, but does not reach the fan operating temperature.

When the operation of the second load 23 is stopped, the temperature inside the box body 1 is lowered again, but the temperature detected by the temperature sensor 32 does not reach the fan stop temperature. The operation of the second fan device 19 is continued.
Then, when the operation of the remaining two loads 22 and 21 is stopped together, the temperature inside the box body 1 further decreases, and when the temperature detected by the temperature sensor 32 reaches the fan stop temperature, the fan device The operation of the second fan device 19 is also stopped because it is not necessary to operate.

In the third embodiment as described above, in particular,
Since the temperature inside the box body 1 is directly detected and the operation of the first and second fan devices 18 and 19 is controlled according to the detected temperature, more efficient operation becomes possible, which in turn results in the first and second operation. It is possible to further lengthen the replacement cycle of the second fan devices 18 and 19.

12 and 13 show a fourth embodiment of the present invention, which is different from the above-mentioned first to third embodiments in the following points. That is, as in the second embodiment, a current transformer 29 (see FIG. 7) and a current-voltage converter 30 (see FIG. 13) are provided as current detecting means for detecting the current flowing through the branch conductor 11, and the box is also provided. As in the third embodiment, a temperature sensor 32 is provided as the temperature detecting means for detecting the temperature inside the body 1, and the detection signals of the current-voltage converter 30 and the temperature sensor 32 are supplied to the fan control device 34, respectively.
(Fan control means). The fan control device 34 uses the detection signals of the current-voltage converter 30 and the temperature sensor 32 to detect the first and second fan devices 1.
In addition to controlling the operations of 8 and 19, the display 35 is controlled.

In this case, the fan control device 34 has the same configuration as in FIG.
As shown in FIG. 1, the number of operating loads is detected by the detected current value based on the detection signal from the current-voltage converter 30, and the first and second fan devices are detected based on the temperature detected by the temperature sensor 32. The operations of 18 and 19 are controlled in the same manner as in the third embodiment.

Further, the fan control device 34 also has the following control function. That is, the current-voltage converter 3
The predicted temperature rise value θa in the box body 1 is calculated according to the number of operating loads detected based on the detected current value from 0. Then, this temperature rise value θ
a, the ambient temperature θo, and the predicted temperature that is the sum of the margin temperature θk and the temperature θb detected by the temperature sensor 32 are compared, and when the detected temperature θb exceeds the predicted temperature (predicted temperature (θa + θo + θk) <detection At the temperature θb), the exhaust port 1
It is determined that one or both of the filter 15 of No. 4 and the filter 17 of the intake port 16 are clogged, and the display 35 indicates that the filters 15 and 17 are clogged.

According to the fourth embodiment as described above, in addition to obtaining the same effect as that of the third embodiment, the filter 1
It is possible to detect clogging of Nos. 5 and 17 and notify the user of this.

The present invention is not limited to the embodiments described above and shown in the drawings. For example, the number of fan devices is not limited to two, but can be applied to three fan devices. It can be appropriately modified within the range not to carry out.

[0046]

According to the closed switchboard of the present invention, the load operating state detecting means detects the operating state of the load, and controls the operation of the fan device in accordance with the operating state of the load, thereby providing a box. It is possible to operate the fan device efficiently while suppressing the temperature rise inside the body. Further, by controlling the operating time of the plurality of fan devices so as to be substantially uniform, the load on each fan device can be reduced, so that the replacement cycle of each fan device can be lengthened. .

According to the closed switchboard of claim 4, further,
The fan control means can detect clogging of the filter and notify the user that the filter is clogged.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and is a time chart when operating a fan device according to the operation of a load.

[Figure 2] Front view of the control center

[Figure 3] Vertical side view of the control center

FIG. 4 is an electrical configuration diagram showing a connection relationship between each unit and a load.

FIG. 5 is a block diagram showing an electrical configuration of a main part.

FIG. 6 is a view corresponding to FIG. 1, showing a second embodiment of the present invention.

FIG. 7 is a diagram corresponding to FIG. 3;

FIG. 8 is a view corresponding to FIG.

FIG. 9 is a view corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 10 is a diagram corresponding to FIG. 2;

FIG. 11 is a diagram corresponding to FIG. 5;

FIG. 12 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention;

FIG. 13 is a view corresponding to FIG.

[Explanation of symbols]

1 is a box, 7 is a unit, 8 is a circuit breaker (device) for wiring,
9 is an inverter device (equipment), 11 is a branch conductor, 14 is an exhaust port, 15 is a filter, 16 is an intake port, 17 is a filter, 18 and 19 are first and second fan devices, and 20 is a fan control device ( Fan control means) 21 to 24 are loads, 2
5 to 28 are switches (load operating state detecting means), 29 is a current transformer (current detecting means), 30 is a current-voltage converter (current detecting means), 31 is a fan control device (fan control means), and 32 is temperature. Sensor (temperature detecting means), 33, 34
Is a fan control device (fan control means), and 35 is a display.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Riki Akabane 2121 No. Osamu, Asahi-cho, Mie-gun, Mie Prefecture Toshiba Corporation Mie factory

Claims (4)

[Claims] 1. A closed switchboard comprising a plurality of units, each unit circuit of which is configured to open and close a load, configured in a unit body, and a plurality of fan devices for ventilating the body. Load operating state detecting means for detecting the operating state of the load, and controlling the operation of each fan device based on the detection signal of the load operating state detecting means so that the operating time of each fan device becomes substantially uniform. A closed switchboard comprising a fan control means for controlling. 2. The load operating state detecting means is constituted by current detecting means for detecting a current flowing through a branch conductor for branching a current to each unit.
Closed switchboard as described. 3. The closed switchboard according to claim 1, wherein the load operating state detecting means is constituted by temperature detecting means for detecting the temperature inside the box body. 4. A plurality of units, each of which is configured by grouping devices for opening and closing a load, for each unit circuit, are housed in the box body, and the air outside the box body is sucked into the box body through an intake port and the box body is also drawn. In a closed switchboard provided with a plurality of fan devices for ventilating the inside of the box by discharging the air from the exhaust port to the outside of the box, current detection means for detecting a current flowing through a branch conductor branching a current to each unit, A temperature detecting means for detecting the temperature inside the box, a filter attached to the intake port and an exhaust port, and controlling the operation of each fan device based on a detection signal of the current detecting means or the temperature detecting means. The fan temperature is controlled so that the operating time of each fan device is substantially uniform, and the predicted temperature predicted based on the detection signal of the current detection unit and the temperature detected by the temperature detection unit are By comparison, closed switchboard, characterized in that the detected temperature has and a fan control means for detecting that a clogging of the filter is higher than the predicted temperature.