JP2021139712A - Temperature abnormality surveillance method and temperature abnormality surveillance device of electric board - Google Patents

Abstract

To detect abnormality in temperature within an electric board inexpensively and readily.SOLUTION: Any temperature among an exhaust temperature t1 from an electric board 10, an upper surface temperature t2 within a board inside an upper surface of the electric board 10, and an upper surface temperature t3 outside a board outside an upper surface of the electric board 10, and a suction temperature t0 to the electric board 10 are measured, and both the temperatures are compared. Temperature measurement means 31 for measuring each temperature is composed of a temperature sensor 32, a battery 33, a radio transmitter 34, and a radio transmission antenna 35, and temperature data are preferably transmitted by radio toward a data logger 40 outside the electric board 10 from the temperature measurement means 31.SELECTED DRAWING: Figure 1

Description

The present invention relates to a monitoring method and a monitoring device for monitoring the presence or absence of a temperature abnormality inside an electric panel.

For example, in various factories such as rolling mills, many electric boards such as distribution boards are used. In an electric panel that generates a large amount of heat, if the internal temperature of the electric panel rises excessively, there is a risk that an abnormality may occur in the equipment inside the electric panel or the life of the equipment may be shortened. Therefore, it is necessary to grasp the temperature inside the electric panel, adjust the temperature by appropriately ventilating, and replace or repair the equipment as necessary.

In Patent Document 1, an optical fiber is installed near the tip of a cable connected to a terminal portion of an electric product in a distribution board, and the temperature of the distribution board terminal portion for determining a temperature abnormality from an increase in optical transmission loss. The monitoring device is disclosed.

Further, Patent Document 2 discloses a fire monitoring device including a control panel including a wireless flame sensor and a wireless receiver, which eliminates the need for connection wiring.

JP-A-2002-81998 Japanese Unexamined Patent Publication No. 2012-8993

According to the temperature monitoring device of Patent Document 1, there is an advantage that the heat generating portion can be specified, but the optical fiber thermometer system has a problem that the cost is extremely high. Further, it is not suitable for mounting in a narrow electric panel due to restrictions on the radius of curvature of the optical fiber.

Patent Document 2 uses a flame sensor and is a technique for detecting a fire at a stage where a fire has occurred, and it is impossible to detect a temperature abnormality in an electric panel in which a fire has not occurred. Moreover, since the flame sensor is an optical sensor, there is a problem that the accuracy is lowered due to dirt or the like when it is used for a long period of time.

Therefore, in view of the above circumstances, an object of the present invention is to detect a temperature abnormality in the electric panel at low cost and at an early stage.

In order to solve the above problems, the present invention is a method of monitoring the presence or absence of a temperature abnormality inside the electric panel, such as the exhaust temperature from the electric panel, the temperature of the upper surface inside the upper surface of the electric panel, and the electricity. The temperature abnormality of the electric panel is characterized in that the temperature of any one of the outer upper surface temperature of the outer surface of the panel and the temperature of intake air to the electric panel are measured and the two temperatures are compared. Provide a monitoring method.

The temperature measuring means for measuring each temperature is composed of a temperature sensor, a battery, a wireless transmitter, and a wireless transmitting antenna, and the temperature data is wirelessly transmitted from the temperature measuring means to a data logger outside the electric panel. You may send it.

Further, the present invention is a device for monitoring the presence or absence of a temperature abnormality inside the electric plate, and is any one of the exhaust port of the electric plate, the inside of the upper surface of the electric plate, and the outside of the upper surface of the electric plate. The electric board is characterized by having one place, a temperature measuring means attached to an intake port to the electric board, and a data logger for recording the temperature data measured by the temperature measuring means. Provide a temperature abnormality monitoring device.

The temperature measuring means may include a temperature sensor, a battery, a wireless transmitter, and a wireless transmitting antenna, and the data logger may be connected to the wireless receiver.

According to the present invention, it is possible to detect the occurrence of a temperature abnormality in an electric panel at an early stage at low cost.

It is a figure explaining the position of the temperature sensor of the preliminary test. It is a graph which shows the temperature measurement result when the heater in an electric panel was heated to 100 degreeC in the preliminary test shown in FIG. It is a graph which shows the temperature measurement result when the heater in an electric panel was heated to 150 degreeC in the preliminary test shown in FIG. It is a figure explaining the position of the temperature sensor of a different preliminary test. It is a graph which shows the temperature measurement result of the preliminary test shown in FIG. It is explanatory drawing which shows an example of the temperature measurement method concerning embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

When an excessive temperature difference occurs between the temperature on the intake side and the temperature on the exhaust side in an electric panel such as a switchboard, it is considered that some abnormality has occurred in the electric panel. Therefore, when monitoring the temperature abnormality inside the electric panel, a preliminary experiment was conducted to set the position to be measured as the temperature on the exhaust side. As a preliminary experiment, a heater was installed as a simulated heat source inside the non-operating electric panel in the electric chamber, and at the positions shown in FIG. 1, the intake temperature t ₀ of the intake port 11 and the exhaust temperature t _{1 of the exhaust port 12 , The inner surface temperature t 2} inside the upper surface 13 of the _{electric plate 10 and the outer upper surface temperature t 3} outside the upper surface 13 of the electric plate 10 are measured for 30 minutes, and the intake air temperature t ₀ and other temperatures t _{1 are measured.} , T ₂ and t ₃ were examined. A silicon rubber heater was used as the heater 20, and each temperature was measured by a sheath thermocouple 30. Each sheath thermocouple 30 was connected to a data logger 40 to record temperature data.

FIG. 2 shows the measurement results when a 100 V, 200 W silicon rubber heater is heated to 100 ° C., and the measurement results of the intake air temperature t ₀ , the exhaust temperature t ₁ , the panel inner upper surface temperature t ₂ , and the panel outer upper surface temperature t ₃ . , And the temperature difference between the intake air temperature t ₀ and the other temperatures t ₁ , t ₂ , t _{3 (t 1 −} t ₀ , t _{2 −} t ₀ , t _{3 −} t ₀ ). Further, FIG. 3 shows a case where the same silicon rubber heater is heated to 150 ° C., and the measurement results of the intake _{air temperature t 0} , the exhaust temperature t ₁ , the panel inner upper surface temperature t ₂ , and the panel outer upper surface temperature t _{3, and the intake air.} It is a graph which shows the temperature difference (t _1- t ₀ , t _2- t ₀ , t _3- t ₀ ) between the temperature t ₀ and other temperatures t ₁ and t _2.

In both cases of FIG. 2 and FIG. 3, the temperature change of the _{upper surface temperature t 2} inside the panel and the upper surface temperature t _{3 outside the panel showed the same as the heater 20 was heated.} Although different from the absolute value of the temperature difference _{t 2 -t 0, t 3 -t} 0 and intake air temperature _{t 0} slightly from becoming a temperature of the heater 20 is constant, respectively, the temperature difference _t 2 -t ₀ , T _3- t ₀ became almost constant values. This shows the same tendency as the exhaust gas temperature t _1. That is, if the tendency of the temperature difference from the inside of the electric panel 10 is investigated in advance at each position, electricity can be obtained from any of the measured values of _{the exhaust temperature t 1 , the upper surface temperature t 2} inside the panel, and the upper surface temperature t _{3 outside the panel.} It was found that the temperature change inside the board 10 can be detected.

When the temperature measuring means is installed inside the electric panel 10, there is a problem that there is interference with other in-panel devices and wiring, and when data transmission is performed wirelessly, it is difficult for radio waves to pass through. On the other hand, there is a concern that the outer surface side of the electric panel 10 is easily affected by the outside air, but according to the above preliminary experiment, the outer surface temperature t _{3 of} the electric panel 10 is the same as the exhaust temperature t ₁ and the upper surface temperature t _{2 of the inner panel.} The temperature fluctuation of the above was obtained, and it followed the temperature change inside the electric panel 10.

Next, regarding the electric panel operating in the electric chamber, at the positions shown in FIG. 4, the intake air temperature t _{0 of the intake port 11, the exhaust temperature t 1} of the exhaust port 12, and the outside panel outside the upper surface 13 of the electric panel 10 The top surface temperature t ₃ was continuously measured for a certain period of time, and the temperature difference (t _{1 −} t ₀ , t _{3 −} t _{0 ) between the intake air temperature t 0} and the temperatures t ₁ and t _{3 at} other positions was examined. Note that the panel in the upper surface temperature t _2, problems and interference with other panel in devices and wiring described above, is omitted because it is also unlikely event of electric shock equipment stops and installers because it is running Release ..

As shown in FIG. 5, the intake air temperature t ₀ , the exhaust temperature t ₁ , and the panel outer top surface temperature t ₃ show similar temperature fluctuations, and the temperature difference between _{the intake air temperature t 0} and the exhaust temperature t _{1 is t 1 −} t. ₀ or the temperature difference _t 3 -t ₀ and intake air temperature _{t 0} and outside panel upper surface temperature _{t 3,} are each substantially constant, the maximum fluctuation width was less than 1 ° C..

As a result of the above preliminary experiments, the exhaust temperature t _{1 , the upper surface temperature t 2} inside the panel, and the upper surface temperature t ₃ outside the panel had different temperature values, but the tendencies of temperature changes were almost the same. Therefore, by investigating in advance the temperature difference of the electric panel 10 in normal times and the tendency of the response delay to the temperature change, any _{one of the exhaust temperature t 1, the upper surface temperature t 2} inside the panel, and the upper surface temperature t _{3 outside the panel is checked.} It has been found that the presence or absence of a temperature abnormality inside the electric panel 10 can be detected by comparing the intake temperature with t _0.

That is, in the present invention, any _{one of the exhaust temperature t 1 from the electric panel 10, the inner surface temperature t 2} on the inner surface side of the electric panel upper surface 13, and the outer surface temperature t ₃ on the outer surface side of the electric panel upper surface 13. By constantly measuring the temperature at one location and the intake temperature t ₀ to the electric panel 10 and comparing the measurement results, it is possible to detect an abnormality in the temperature inside the electric panel 10 at an early stage. be.

FIG. 6 shows an example of the temperature measuring means 31 according to the embodiment of the present invention. The temperature measuring means 31 is composed of a temperature sensor 32, a battery 33, a wireless transmitter 34, and a wireless transmitting antenna 35, and measurement data is transmitted wirelessly. The battery 33 may be a rechargeable battery type, or may be a combination with photovoltaic power generation or vibration power generation. The transmitted temperature data is received by the wireless receiver 41 provided outside the electric panel 10 and recorded in the data logger 40 connected to the wireless receiver 41. The temperature measuring means 31 can be fixed to, for example, the casing 14 of the electric panel 10 with a permanent magnet 36. As a result, the wiring and installation costs of the temperature measuring means 31 can be significantly reduced. When the casing 14 of the electric plate 10 is not made of iron, an iron plate may be fixed to the casing 14 with an adhesive or the like, and the temperature measuring means 31 with a magnet may be attached to the iron plate. The temperature sensor 32 is preferably a low-cost and highly reliable sheath thermocouple, and more preferably, for example, two thermocouples are installed in one temperature measuring means 31. By installing two thermocouples in one place, it is possible to constantly compare the measurement results and confirm the presence or absence of an abnormality in the temperature sensor 32, and if an abnormality occurs, it can be detected early. It can be detected with high reliability. The temperature measured in the present invention is, for example, up to about 150 ° C., and another temperature sensor having a temperature range lower than that of the thermocouple can also be used.

The temperature to be compared with the intake air temperature t _{0 is appropriately set to one of the exhaust temperature t 1} , the inner upper surface temperature t ₂ , and the _{outer upper surface temperature t 3} according to the inside of the electric panel 10 and the surrounding environment. You can select it. For example, the results of preliminary tests, the highest sensitivity to anomalies in the electric panel 10, but the less susceptible to external influences of the electric board 10 is Ban'nai top temperature t _2, electrical temperature measurement means 31 meter be installed in the board 10 from interference or the like with other devices in an electrical panel 10, may better be avoided preferably, in such a case, by performing the measurement of the outside panel upper surface temperature t ₃ good. _{However, if stable measurement cannot be performed at the outer surface temperature t 3} due to the external environment of the electric panel 10, a temperature measuring means 31 is installed in the panel to avoid communication failure, other than the temperature sensor 32. It is preferable to arrange the equipment of the above on the outside of the panel.

In the present invention, since such temperature measuring means 31 may be attached to two places per one electric board 10, the construction cost can be significantly reduced as compared with other methods. Further, if the measurement is performed using the temperature sensor 32, the equipment cost can be significantly reduced as compared with the case of using, for example, an optical fiber or a two-dimensional imaging device.

Further, the intake air temperature t ₀ may be measured at the intake port 11 of the electric board 10, and when a plurality of electric boards 10 are arranged in a row, the intake port of a representative electric board 10 may be measured. Only one of 11 may be measured. Further, the room temperature of the electric room in which the electric panel 10 is installed may be set to the intake air temperature t ₀ . In this case, the number of thermometers can be further reduced and the cost can be reduced.

As described above, in the present invention, any one of the exhaust temperature t _{1 , the upper surface temperature t 2} inside the panel, and the upper surface temperature t ₃ outside the panel and the intake air temperature t ₀ are constantly monitored, and the intake air temperature t ₀ and the other temperature are constantly monitored. By setting the threshold value of the temperature difference from t ₁ , t ₂ , or t ₃ in advance, it is possible to detect the temperature abnormality in the electric panel 10 at an early stage. As a result, it is possible to prevent abnormalities in the equipment inside the panel and contribute to operational stability. The present invention only detects the presence or absence of a temperature abnormality in the electric plate 10, and when a temperature abnormality is detected, for example, the electric plate 10 is opened and a separately portable two-dimensional radiation thermometer is detected. The inside may be investigated by using the above method to identify the part that causes fever.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention also includes them. It is understood that it belongs to.

The present invention can be applied to monitor the temperature abnormality of a container that may generate heat internally.

10 Electric panel 11 Intake port 12 Exhaust port 13 Top surface 31 Temperature measuring means 32 Temperature sensor 33 Battery 34 Wireless transmitter 35 Wireless transmitter antenna 40 Data logger 41 Wireless receiver

Claims (4)

It is a method of monitoring the presence or absence of temperature abnormalities inside the electric panel.
The temperature at any one of the exhaust temperature from the electric panel, the inner upper surface temperature inside the upper surface of the electric panel, and the outer upper surface temperature outside the upper surface of the electric panel, and the intake air temperature to the electric panel. A method for monitoring an abnormality in the temperature of an electric panel, which comprises measuring and comparing the temperatures of both. The temperature measuring means for measuring each temperature is composed of a temperature sensor, a battery, a wireless transmitter, and a wireless transmitting antenna.
The temperature abnormality monitoring method for an electric panel according to claim 1, wherein temperature data is wirelessly transmitted from the temperature measuring means to a data logger outside the electric panel. It is a device that monitors the presence or absence of temperature abnormalities inside the electric panel.
A temperature measuring means attached to any one of the exhaust port of the electric plate, the inside of the upper surface of the electric plate, the outside of the upper surface of the electric plate, and the intake port to the electric plate.
A temperature abnormality monitoring device for an electric panel, comprising: a data logger that records temperature data measured by the temperature measuring means. The electric panel according to claim 3, wherein the temperature measuring means includes a temperature sensor, a battery, a wireless transmitter, and a wireless transmitting antenna, and the data logger is connected to the wireless receiver. Temperature abnormality monitoring device.

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