JP2011041437A - Dew condensation detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely and accurately detect the dew condensation state of the surface of the insulation of electrical equipment. <P>SOLUTION: In a dew condensation state detection system, an infrared temperature sensor 3 contactlessly detecting the temperature of the surface 2a of the insulation of a transformer 2 as the detection object of the dew condensation state is mounted while arranging a simulation dew condensation detector 4 in the same environment as the transformer 2. In the dew condensation state detection system, heat dissipation and heat absorption to the detecting surface 4a of the simulation dew condensation detector 4 for a Peltier element 6 are adjusted so that the temperature of the surface 2a of the insulation of the transformer 2 detected by the infrared temperature sensor 3 and the temperature of the detecting surface 4a of the simulation dew condensation detector 4 detected by a temperature sensor 8 are equalized. The dew condensation state of the surface 2a of the insulation of the transformer 2 is reproduced on the detecting surface 4a of the simulation dew condensation detector 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a system for detecting the dew condensation state of electrical equipment such as a transformer and an electric motor.

  Generally, electric devices such as transformers and electric motors are installed and operated in various environments. In the insulation portions of conductors such as windings of these electric devices, there is a risk that the insulation resistance decreases due to the temperature rise of the electric devices or the surrounding environment, and accidents such as electric leakage and burning occur. In particular, when condensation occurs on the surface of the insulating portion (insulating surface), the degree of risk that an insulation accident may occur increases. Therefore, in order to prevent the occurrence of condensation in these electrical devices, for example, a system as shown in Patent Document 1 has been proposed in a situation where condensation occurs on the surface of the insulating portion of the electrical device.

  In the technique proposed in Patent Document 1, the ambient temperature of an electrical device is detected by a thermometer, and the dew point corresponding to the ambient humidity of the electrical device is detected by a dew point meter, and the ambient temperature of the electrical device detected by the thermometer is detected. When the difference between the temperature and the dew point detected by the dew point meter is equal to or less than the set value, the space heater provided in the electric device is activated.

Japanese Utility Model Publication No. 6-2904

  The temperature of the surface of the insulating part of the electric device may differ from the ambient temperature depending on the operating condition of the electric device. Therefore, with the technique proposed in Patent Document 1 that detects the ambient temperature of an electrical device with a thermometer, it is difficult to accurately detect the temperature of the insulating part surface of the electrical device, and the dew condensation state is accurately detected. Is difficult. In order to accurately detect the temperature of the insulation surface of the electrical equipment, it is conceivable to place a thermometer directly on the insulation surface of the electrical equipment that is the detection location, but in electrical equipment such as transformers and motors, etc. Generally, a high electric field is applied to the surface of the insulating portion, and it is difficult to install these thermometers without destroying them.

  Further, in the method of detecting the dew condensation state using a dew point meter or a hygrometer, it is premised that an operating point at which dew condensation occurs in a clean environment is detected. However, when the surrounding environment is significantly fouled, especially when fouling substances containing substances with significant deliquescence such as sea salt particles and chlorides adhere to the surface of the insulation, the relative humidity that normally causes condensation is Condensation is supposed to occur even at 100% or less, and condensation may occur even at temperatures above the dew point.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dew condensation state detection system that can safely and accurately detect the dew condensation state on the surface of an insulating part of an electrical device. .

In order to achieve the above-described object, the dew condensation state detection system according to claim 1 comprises:
Non-contact temperature detection means for detecting the temperature of the surface of the insulating part of the electrical equipment that is the detection target of the dew condensation state in a non-contact manner and outputting the detection result;
Heat dissipation and heat absorption means for selectively performing heat dissipation and heat absorption with respect to the detection surface of the simulated dew condensation detection unit disposed in the same environment as the electrical equipment;
Temperature detection means for detecting the temperature of the detection surface of the simulated dew condensation detection unit and outputting a detection result;
Temperature adjustment control means for inputting the detection result output from the non-contact temperature detection means and the detection result output from the temperature detection means;
Condensation state detection means for detecting the condensation state of the detection surface of the simulated condensation detection unit and outputting the detection result to the outside of the system,
The temperature adjustment control means is based on the detection result input from the non-contact temperature detection means and the detection result input from the temperature detection means, and the insulating portion of the electrical device detected by the non-contact temperature detection means. Heat dissipation and heat absorption to the detection surface of the simulated dew condensation detection unit of the heat dissipation heat absorption unit are adjusted so that the surface temperature and the temperature of the detection surface of the simulated dew condensation detection unit detected by the temperature detection unit are the same. However, it has a feature.

  According to the configuration described above, the temperature of the surface of the insulating part of the electrical device that is the detection target of the dew condensation state is detected in a non-contact manner by the non-contact temperature detecting means, and is located in the same environment as the electrical device. When the temperature of the detection surface is detected by the temperature detection means, the temperature of the insulating part surface of the electrical equipment detected by the non-contact temperature detection means and the temperature of the detection surface of the simulated dew condensation detection part detected by the temperature detection means Since the temperature adjustment control means adjusts heat dissipation and heat absorption to the detection surface of the simulated dew condensation detection unit of the heat dissipation and heat absorption means, the detection surface of the simulated dew condensation detection unit shows the dew condensation state on the insulating part surface of the electrical equipment. Can be reproduced.

  According to the dew condensation state detection system described in claim 1, non-contact temperature detection means for detecting the temperature of the insulating part surface of the electrical device that is the detection target of the dew condensation state in a non-contact manner is provided, and is the same as the electrical device. A simulated dew condensation detection unit is provided in the environment, and it is configured to reproduce the dew condensation state on the insulation surface of the electrical equipment on the detection surface of the simulated dew condensation detection unit, so the dew condensation state on the detection surface of the simulated dew condensation detection unit is detected. By outputting the detection result to the outside of the system, it is possible to output the detection result obtained by simulating the dew condensation state on the surface of the insulating part of the electrical equipment to the outside of the system, and by analyzing the detection result, It is possible to detect the dew condensation state on the surface of the insulating part of the device. In this case, since the temperature of the insulating part surface of the electrical equipment that is the detection target of the dew condensation state is detected by the non-contact temperature detecting means in a non-contact manner, the temperature detecting means is directly arranged on the insulating part surface of the electrical equipment. There is no need, and the dew condensation state on the surface of the insulating part of the electrical equipment can be detected safely and accurately.

Functional block diagram showing a first embodiment of the present invention Diagram showing overall configuration Diagram showing simulated dew condensation detector Flow chart showing temperature adjustment control process Flow chart showing condensation prevention control process Functional block diagram showing a second embodiment of the present invention Functional block diagram showing a third embodiment of the present invention Functional block diagram showing a fourth embodiment of the present invention

(First embodiment)
Hereinafter, the present invention will be described with reference to FIGS. 1 to 5 for a first embodiment in which a transformer is applied as an electrical device that is a detection target of a dew condensation state. As shown in FIG. 2, in the dew condensation state detection system 1, the temperature of the insulating portion surface 2 a (see FIG. 1) of the transformer 2 is not contacted in the vicinity of the transformer 2 (electric equipment in the present invention). An infrared temperature sensor 3 to be detected (non-contact temperature detecting means in the present invention) and a simulated dew condensation detection unit 4 are provided, and a space heater 5 is provided at a position where heat can be radiated to the insulating surface 2a of the transformer 2. (Condensation prevention means in the present invention) is provided. The simulated dew condensation detection unit 4 is placed in the same environment as the transformer 2 (in a polluted state, particularly in an environment in which a pollutant containing sea salt particles, chlorides, and other substances having a remarkable deliquescent level is attached). Has been.

  As shown in FIG. 3, the simulated dew condensation detection unit 4 includes a Peltier element 6 (heat radiation heat absorption means as referred to in the present invention), a dew condensation sensor 7 (dew condensation state detection means as defined in the present invention), and a temperature sensor 8 (temperature referred to in the present invention). The detecting means) and the humidity sensor 9 (humidity detecting means in the present invention) are combined. In this case, the temperature sensor 8 and the humidity sensor 9 are directly mounted on the surface 7a on one side (left side in FIG. 3B) of the dew condensation sensor 7, and the Peltier element 6 is mounted on the dew condensation sensor 7 housing. It is directly mounted on the surface 7b on the other side (right side in FIG. 3B). That is, the dew condensation sensor 7 is sandwiched between the temperature sensor 8 and the humidity sensor 9 and the Peltier element 6.

  In the dew condensation sensor 7, a pair of comb-like electrodes 10 and 11 are formed on the surface 7a on which the temperature sensor 8 and the humidity sensor 9 are mounted, and an electric resistance value and a threshold value between the electrodes 10 and 11 are determined. By comparing, the dew condensation state of the surface 7a (whether dew condensation has occurred or has been eliminated) is detected. That is, the surface 7a of the dew condensation sensor 7 on which the temperature sensor 8 and the humidity sensor 9 are mounted is the detection surface 4a (see FIG. 1) of the simulated dew condensation detection unit 4.

  In the above-described configuration, it is desirable that the heat conduction characteristic of the detection surface 4a of the simulated dew condensation detection unit 4 is approximately the same as the heat conduction characteristic of the insulating part surface 2a of the transformer 2 that is a detection target of the dew condensation state. That is, in the transformer 2, the heat generated from the heat source mounted in the transformer 2 is conducted to the insulating surface 2a, and in the simulated dew condensation detector 4, the heat generated from the Peltier element 6 is conducted from the surface 7b to the surface 7a. However, as the heat conduction mode from the heat source to the insulating portion surface 2a in the transformer 2 and the heat conduction mode from the surface 7b to the surface 7a in the simulated dew condensation detection unit 4 are the same, It is possible to reproduce the heat conduction mode from the heat source to the insulating portion surface 2a in the heat conduction mode from the surface 7b to the surface 7a in the simulated dew condensation detection unit 4. In the present embodiment, the configuration in which the Peltier element 6 is directly mounted on the dew condensation sensor 7 as described above has been described. However, the Peltier element 6 is mounted on the dew condensation sensor 7 via a member. In this case as well, it is desirable that the heat conduction characteristic through the member from the Peltier element 6 to the dew condensation sensor 7 is similar to the heat conduction characteristic of the insulating portion surface 2a of the transformer 2.

  FIG. 1 is a functional block diagram showing the electrical configuration of the dew condensation state detection system 1 described above. The infrared temperature sensor 3, the Peltier element 6, the dew sensor 7, the temperature sensor 8, the humidity sensor 9 and the space heater 5 are composed of a control device 12 (a temperature adjustment control means, dew prevention control in the present invention) mainly composed of a microcomputer. Means). The control device 12 controls the operation of the entire system of the dew condensation state detection system 1 by executing a control program stored therein.

  The infrared temperature sensor 3 collects infrared rays radiated from the insulating portion surface 2a of the transformer 2 to detect (measure) the temperature of the insulating portion surface 2a of the transformer 2 in a non-contact manner, and the detected temperature Is output to the control device 12. The Peltier element 6 performs heat dissipation (heating) when receiving a heat dissipation command signal from the control device 12, and performs heat absorption (cooling) when receiving an endothermic command signal.

  The dew condensation sensor 7 detects the dew condensation state of the detection surface 4a of the simulated dew condensation detection unit 4 in accordance with the above-described procedure, outputs a dew condensation state detection signal representing the detection result to the control device 12, and externally the dew condensation state detection system 1. Output to. The temperature sensor 8 detects (measures) the temperature of the detection surface 4 a of the simulated dew condensation detection unit 4, and outputs a temperature detection signal representing the detected temperature to the control device 12 and to the outside of the dew condensation state detection system 1. . The humidity sensor 9 detects (measures) the humidity of the detection surface 4 a of the simulated dew condensation detection unit 4, outputs a humidity detection signal representing the detected humidity to the control device 12, and outputs it to the outside of the dew condensation state detection system 1. .

  The control device 12 includes a temperature adjustment control unit 12a that is a functional block that performs temperature adjustment on the detection surface 4a of the simulated dew condensation detection unit 4, and a dew condensation prevention control that is a functional block that prevents condensation on the insulating surface 2a of the transformer 2. Part 12b. When the temperature adjustment control unit 12a receives the non-contact temperature detection signal from the infrared temperature sensor 3 and the temperature detection signal from the temperature sensor 8, the control device 12 analyzes the non-contact temperature detection signal to thereby convert the transformer 2. The temperature of the insulating part surface 2a of the transformer 2 is obtained by analyzing the temperature detection signal and the temperature of the detection surface 4a of the simulated dew condensation detection part 4 is obtained, and the temperature of the insulating part surface 2a of the transformer 2 and the simulated dew condensation detection part 4 is compared with the temperature of the detection surface 4a. Then, the control device 12 determines whether the temperature of the insulating portion surface 2a of the transformer 2 and the temperature of the detection surface 4a of the simulated dew condensation detection portion 4 are the same as those of the heat dissipation command signal and the heat absorption command signal. Selectively output to the element 6.

  Further, when the dew condensation prevention control unit 12b receives the dew condensation state detection signal from the dew condensation sensor 7, the control device 12 analyzes the dew condensation state detection signal to obtain the dew condensation state of the detection surface 4a of the simulated dew condensation detection unit 4. When a humidity detection signal is input from the humidity sensor 9, the humidity of the detection surface 4a of the simulated dew condensation detection unit 4 is acquired by analyzing the humidity detection signal. When the start command signal is input from the control device 12, the space heater 5 starts heat radiation to the insulating portion surface 2 a of the transformer 2, and when the stop command signal is input from the control device 12, the space heater 5 applies to the insulating portion surface 2 a of the transformer 2. End heat dissipation.

  Next, the operation of the above configuration will be described with reference to FIGS. As a control related to the present invention, the control device 12 performs a temperature adjustment control process for adjusting the temperature of the detection surface 4a of the simulated dew condensation detection unit 4 and prevents condensation on the insulating surface 2a of the transformer 2. Condensation prevention control processing is performed. In the present embodiment, the description will be made on the assumption that the control device 12 has a multitask function so that the temperature adjustment control process and the dew condensation prevention control process are simultaneously executed in parallel. If the control device 12 does not have a multitask function, the temperature adjustment control process and the dew condensation prevention control process may be alternately executed at a predetermined cycle (for example, a cycle of several microseconds).

(1) Temperature adjustment control process In the temperature adjustment control process, the control device 12 analyzes the non-contact temperature detection signal input from the infrared temperature sensor 3 and detects the insulating part surface 2a of the transformer 2 detected by the infrared temperature sensor 3. (Step S1), the temperature detection signal input from the temperature sensor 8 is analyzed, and the temperature of the detection surface 4a of the simulated dew condensation detection unit 4 detected by the temperature sensor 8 is acquired (step S2). The acquired temperature of the insulating part surface 2a of the transformer 2 is compared with the temperature of the detection surface 4a of the simulated dew condensation detection part 4 (steps S3 and S4).

  When control device 12 determines that the temperature of insulating portion surface 2a of transformer 2 is lower than the temperature of detection surface 4a of simulated dew condensation detection portion 4 (“YES” in step S3), the heat dissipation command signal is transmitted to Peltier. The temperature is output to the element 6, the Peltier element 6 performs heat dissipation, the temperature of the detection surface 4 a of the simulated dew condensation detection unit 4 is increased (step S 5), and the process returns to the above-described step S 1. Further, when the control device 12 determines that the temperature of the insulating portion surface 2a of the transformer 2 is higher than the temperature of the detection surface 4a of the simulated dew condensation detection portion 4 (“YES” in step S4), the heat absorption command signal is transmitted to the Peltier device. It outputs to the element 6, makes the Peltier element 6 absorb heat, lowers the temperature of the detection surface 4a of the simulated dew condensation detection unit 4 (step S6), and returns to the above-described step S1.

  On the other hand, when control device 12 determines that the temperature of insulating portion surface 2a of transformer 2 is neither lower nor higher than the temperature of detection surface 4a of simulated dew condensation detection portion 4 (the same), in step S3 “NO”, “NO” in S4), the temperature of the detection surface 4a of the simulated dew condensation detection unit 4 is maintained without outputting either the heat release command signal or the heat absorption command signal to the Peltier element 6 (step S7). The process returns to step S1 described above.

  That is, the control device 12 performs the above-described series of processing, so that the temperature of the insulating portion surface 2a of the transformer 2 and the temperature of the detection surface 4a of the simulated condensation detection portion 4 are the same. 4 detection surface 4a is adjusted.

(2) Condensation prevention control process In the condensation prevention control process, the control device 12 is initialized by setting, for example, 100 [%] as a condensation generation humidity that is a criterion for operation control of the space heater 5 as described later. (Step S11). Next, the control device 12 analyzes the humidity detection signal input from the humidity sensor 9, acquires the humidity of the detection surface 4 a of the simulated dew condensation detection unit 4 detected by the temperature sensor 9 (step S 12), and from the dew condensation sensor 7. The input dew condensation state detection signal is analyzed, and the dew condensation state (either dew condensation has occurred or has been eliminated) on the detection surface 4a of the simulated dew condensation detection unit 4 is acquired (step S13). A dew condensation state is determined (step S14).

  Here, when the control device 12 determines that condensation has occurred on the detection surface 4a of the simulated dew condensation detection unit 4 ("YES" in step S14), the control device 12 detects the detection surface 4a of the simulated dew condensation detection unit 4 acquired immediately before that. The humidity is compared with the humidity at which condensation occurs (step S15). If the control device 12 determines that the humidity of the detection surface 4a of the simulated dew condensation detection unit 4 acquired immediately before is less than the dew condensation generation humidity ("YES" in step S15), the simulated dew condensation acquired immediately before that. The humidity of the detection surface 4a of the detection unit 4 is updated (newly set) as the latest dew condensation generation humidity and stored (step S16), an activation command signal is output to the space heater 5, the space heater 5 is activated, Heat is radiated to the insulating portion surface 2a of the vessel 2 (step S17), and the process returns to step S12.

  On the other hand, when the control device 12 determines that the humidity of the detection surface 4a of the simulated dew condensation detection unit 4 acquired immediately before is not less than the dew condensation generation humidity ("NO" in step S15), the simulated dew condensation detection acquired immediately before that. The start command signal is output to the space heater 5 without updating the humidity of the detection surface 4a of the section 4 as the latest dew condensation generation humidity, the space heater 5 is started, and heat is radiated to the insulating portion surface 2a of the transformer 2 (Step S17), the process returns to Step S12 described above.

  Further, if the control device 12 determines that no condensation has occurred on the detection surface 4a of the simulated condensation detection unit 4 (the generated condensation has been eliminated) ("NO" in step S14), also in this case, immediately before that The humidity of the detection surface 4a of the simulated dew condensation detection unit 4 acquired in step S18 is compared with the dew generation humidity (step S18). If the control device 12 determines that the humidity of the detection surface 4a of the simulated dew condensation detection unit 4 acquired immediately before is equal to or higher than the dew condensation generation humidity ("YES" in step S18), the start command signal is sent to the space heater 5 , The space heater 5 is activated, heat is radiated to the insulating portion surface 2a of the transformer 2 (step S17), and the process returns to the above-described step S12. On the other hand, if the control device 12 determines that the humidity of the detection surface 4a of the simulated dew condensation detection unit 4 acquired immediately before is not equal to or higher than the dew condensation generation humidity ("NO" in step S18), a stop command signal is sent to the space heater 5. The output is stopped, the space heater 5 is stopped, and the process returns to the above-described step S12 without causing heat radiation to the insulating portion surface 2a of the transformer 2 (step S19).

  As described above, according to the first embodiment, in the dew condensation state detection system 1, the infrared temperature sensor 3 that detects the temperature of the insulating portion surface 2a of the transformer 2 that is the detection target of the dew condensation state in a non-contact manner. A simulated dew condensation detection unit 4 is provided in the same environment as the transformer 2, and the temperature of the insulation surface 2 a of the transformer 2 detected by the infrared temperature sensor 3 and the simulated dew condensation detected by the temperature sensor 8. Since the heat radiation and the heat absorption to the detection surface 4a of the simulated dew condensation detection unit 4 of the Peltier element 6 are adjusted so that the temperature of the detection surface 4a of the detection unit 4 is the same, the surface of the insulating part of the transformer 2 The dew condensation state 2a can be reproduced on the detection surface 4a of the simulated dew condensation detection unit 4. And the detection result which detected the dew condensation state of the detection surface 4a of the simulation dew condensation detection part 4 is output to the exterior of a system, and the detection result which detected the dew condensation state of the insulation part surface 2a of the transformer 2 is system-ized. By analyzing the detection result, the dew condensation state of the insulating portion surface 2a of the transformer 2 can be detected safely and accurately.

  In this case, the detection result detected by the temperature sensor 8 and the detection result detected by the humidity sensor 9 are also output to the outside of the system, so that the dew condensation state, temperature and humidity on the insulating portion surface 2a of the transformer 2 Can be correlated and analyzed.

  Also, in this case, the condensation generation humidity is updated and stored one by one, and if it is determined that no condensation has occurred on the detection surface 4a of the simulated condensation detection unit 4, the humidity detected by the humidity sensor 9 is condensed. If the humidity is higher than the generated humidity, heat is radiated to the insulating part surface 2a of the transformer 2, and if the humidity detected by the humidity sensor 9 is not higher than the dew condensation generated humidity, the heat is radiated to the insulating part surface 2a of the transformer 2. Since the configuration is such that the condensation does not occur, once the condensation has occurred, it is possible to prevent the condensation from occurring next.

  That is, the surrounding environment is significantly contaminated on the insulating surface 2a of the transformer 2 that is the object of detection of the dew condensation state and the detection surface 4a of the simulated dew condensation detection unit 4 disposed in the same environment as the transformer 2. In the state, especially in the state where a fouling substance containing a substance having remarkable deliquescence such as sea salt particles and chloride adheres to the surface of the insulating portion, even if the relative humidity that is usually considered to cause dew condensation is 100% or less Condensation may occur, but as in the first embodiment, the condensation generation humidity is stored, and the operation of the space heater 5 is controlled by using the stored condensation generation humidity as a determination criterion. This can be prevented beforehand. In addition, when the condensation generation humidity is updated one by one and the operation of the space heater 5 is controlled using the updated condensation generation humidity as a criterion, for example, even when the fouling state becomes severe and the condensation generation humidity is reduced, Can be prevented in advance.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The dew condensation state detection system 21 of the second embodiment has a configuration in which the space heater 5, the humidity sensor 9, and the dew condensation prevention control unit 12b are omitted from the dew condensation state detection system 1 described in the first embodiment. According to the second embodiment, the same operational effects as those of the first embodiment described above can be obtained. That is, the temperature of the Peltier element 6 is set so that the temperature of the insulating part surface 2a of the transformer 2 detected by the infrared temperature sensor 3 and the temperature of the detection surface 4a of the simulated dew condensation detection part 4 detected by the temperature sensor 8 are the same. Since heat dissipation and heat absorption with respect to the detection surface 4a of the simulated dew condensation detection unit 4 are adjusted, the dew condensation state of the insulating unit surface 2a of the transformer 2 can be reproduced on the detection surface 4a of the simulated dew condensation detection unit 4. The dew condensation state of the insulating part surface 2a of the transformer 2 can be detected safely and accurately.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. The dew condensation state detection system 31 of the third embodiment has a configuration in which the space heater 5 and the dew condensation prevention control unit 12b are omitted from the dew condensation state detection system 1 described in the first embodiment. According to the third embodiment, the same operational effects as those of the first embodiment described above can be obtained. That is, the temperature of the Peltier element 6 is set so that the temperature of the insulating part surface 2a of the transformer 2 detected by the infrared temperature sensor 3 and the temperature of the detection surface 4a of the simulated dew condensation detection part 4 detected by the temperature sensor 8 are the same. Since heat dissipation and heat absorption with respect to the detection surface 4a of the simulated dew condensation detection unit 4 are adjusted, the dew condensation state of the insulating unit surface 2a of the transformer 2 can be reproduced on the detection surface 4a of the simulated dew condensation detection unit 4. The dew condensation state of the insulating part surface 2a of the transformer 2 can be detected safely and accurately. Also in this case, the condensation state of the insulating portion surface 2a of the transformer 2 can be analyzed in association with the temperature and humidity.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. In the dew condensation state detection system 41 of the third embodiment, the humidity sensor 9 is omitted from the dew condensation state detection system 1 described in the first embodiment, and a dew condensation prevention control unit is used instead of the dew condensation prevention control unit 12b. It is the structure provided. That is, the control device 42 (temperature adjustment control means, dew condensation elimination control means in the present invention) includes a temperature adjustment control unit 42a that is a functional block for performing temperature adjustment on the detection surface 4a of the simulated dew condensation detection unit 4, and the transformer 2. A dew condensation eliminating control unit 42b which is a functional block for eliminating dew condensation occurring on the insulating portion surface 2a. In this case, when the control device 42 receives the dew condensation state detection signal from the dew condensation sensor 7 and determines that dew condensation has occurred on the detection surface 4a of the simulated dew condensation detection unit 4, the control device 42 sends a start command signal to the space heater 43 (in the present invention). Output to the dew condensation eliminating means), start the space heater 43, start heat radiation to the insulating part surface 2a of the transformer 2, and stop if the dew condensation generated on the detection surface 4a of the simulated dew condensation detection part 4 has been eliminated. A command signal is output to the space heater 43, the space heater 43 is stopped, and the heat dissipation with respect to the insulation part surface 2a of the transformer 2 is complete | finished.

  According to the fourth embodiment, the same operational effects as those of the first embodiment described above can be obtained. That is, the temperature of the Peltier element 6 is set so that the temperature of the insulating part surface 2a of the transformer 2 detected by the infrared temperature sensor 3 and the temperature of the detection surface 4a of the simulated dew condensation detection part 4 detected by the temperature sensor 8 are the same. Since heat dissipation and heat absorption with respect to the detection surface 4a of the simulated dew condensation detection unit 4 are adjusted, the dew condensation state of the insulating unit surface 2a of the transformer 2 can be reproduced on the detection surface 4a of the simulated dew condensation detection unit 4. The dew condensation state of the insulating part surface 2a of the transformer 2 can be detected safely and accurately. Further, in this case, by controlling the operation of the space heater 43 based on whether or not condensation has occurred on the detection surface 4a of the simulated dew condensation detection unit 4, dew condensation generated on the insulating unit surface 2a of the transformer 2 can be reduced. Can be resolved.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be modified or expanded as follows.
The electrical device that is the detection target of the dew condensation state is not limited to the transformer, and may be another device such as an electric motor.
In the first embodiment, in addition to updating and storing the humidity at the time when condensation occurs as the condensation generation humidity, the humidity at the time when the generated condensation disappears is updated and stored as the condensation elimination humidity. However, the operation of the space heater 5 may be controlled using the dew condensation-removed humidity updated one by one as a criterion. Further, in addition to the humidity detected by the humidity sensor 9, the temperature detected by the temperature sensor 8 is also used as a criterion, and the condensation generation temperature and the condensation elimination temperature are updated and stored one by one, and the operation of the space heater 5 is controlled. You may do it.

  In the drawings, 1 is a dew condensation state detection system, 2 is a transformer (electrical device), 3 is an infrared temperature sensor (non-contact temperature detecting means), 4 is a simulated dew condensation detection unit, 4a is a detection surface, and 5 is a space heater (condensation). Prevention means), 6 is a Peltier element (heat dissipation heat absorption means), 7 is a condensation sensor (condensation state detection means), 8 is a temperature sensor (temperature detection means), 9 is a humidity sensor (humidity detection means), and 12 is a control device ( (Temperature adjustment control means, condensation prevention control means), 21 is a condensation state detection system, 31 is a condensation state detection system, 41 is a condensation state detection system, 42 is a control device (temperature adjustment control means and condensation elimination control means), 43 is Space heater (condensation eliminating means).

Claims (5)

Non-contact temperature detection means for detecting the temperature of the surface of the insulating part of the electrical equipment that is the detection target of the dew condensation state in a non-contact manner and outputting the detection result;
Heat dissipation and heat absorption means for selectively performing heat dissipation and heat absorption with respect to the detection surface of the simulated dew condensation detection unit disposed in the same environment as the electrical equipment;
Temperature detection means for detecting the temperature of the detection surface of the simulated dew condensation detection unit and outputting a detection result;
Temperature adjustment control means for inputting the detection result output from the non-contact temperature detection means and the detection result output from the temperature detection means;
Condensation state detection means for detecting the condensation state of the detection surface of the simulated condensation detection unit and outputting the detection result to the outside of the system,
The temperature adjustment control means is based on the detection result input from the non-contact temperature detection means and the detection result input from the temperature detection means, and the insulating portion of the electrical device detected by the non-contact temperature detection means. Heat dissipation and heat absorption to the detection surface of the simulated dew condensation detection unit of the heat dissipation heat absorption unit are adjusted so that the surface temperature and the temperature of the detection surface of the simulated dew condensation detection unit detected by the temperature detection unit are the same. A dew condensation state detection system.   The dew condensation state detection system according to claim 1, further comprising humidity detection means for detecting the humidity of the detection surface of the simulated dew condensation detection unit and outputting a detection result to the outside of the system.   3. The dew condensation state detection system according to claim 1, wherein the temperature detection unit outputs a detection result obtained by detecting the temperature of the detection surface of the simulated dew condensation detection unit to the outside of the system. Condensation eliminating means for eliminating condensation generated on the surface of the insulating part by performing heat dissipation on the surface of the insulating part of the electrical equipment;
Condensation elimination control means for inputting the detection result output from the dew condensation state detection means and controlling the operation of the condensation elimination means based on the inputted detection result,
The dew condensation eliminating control unit activates the dew condensation eliminating unit when it is determined that dew condensation has occurred on the detection surface of the simulated dew condensation detection unit based on the detection result input from the dew condensation state detecting unit, 2. The dew condensation state detection system according to claim 1, wherein the dew condensation eliminating unit is stopped when it is determined that the dew condensation generated in the simulated dew condensation detection unit is eliminated by activating the dew condensation eliminating unit. . Humidity detection means for detecting the humidity of the detection surface of the simulated dew condensation detection unit and outputting a detection result;
Condensation prevention means for preventing the occurrence of dew condensation on the surface of the insulating part by performing heat dissipation on the surface of the insulating part of the electrical equipment;
Condensation prevention control means for inputting the detection result output from the dew condensation state detection means and the detection result output from the humidity detection means, and controlling the operation of the dew condensation prevention means based on the input detection results; With
When the dew condensation prevention control unit determines that dew condensation has occurred on the detection surface of the simulated dew condensation detection unit based on the detection result input from the dew condensation state detection unit and the detection result input from the humidity detection unit. If the humidity detected by the humidity detection means at that time is less than the condensation generation humidity, the humidity detected by the humidity detection means at that time is updated as new condensation generation humidity and the condensation prevention means is updated. If the humidity detected by the humidity detection means at that time is not less than the condensation generation humidity, the condensation prevention means is started without updating the condensation generation humidity, and condensation is formed on the detection surface of the simulated condensation detection unit. If the humidity detected by the humidity detection means at that time is equal to or higher than the condensation generation humidity, the condensation prevention means is activated. If humidity is less than condensation occurrence humidity detected by said humidity detecting means at that point, dew condensation state detection system according to claim 1, characterized in that stopping the condensation preventing means.

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