JPWO2013057925A1 - Electrical equipment condition monitoring device - Google Patents

Abstract

  The present invention is arranged around a conducting conductor 33 for facilitating attachment and removal for constantly monitoring the temperature and dust adhesion state of the high voltage main circuit charging part of the metal closed type switchgear. The first core 21 and the second core 22, the coil 3 wound around a part of the second core 22 and generating an induced voltage when the conductor 33 is energized, and the temperature of the conductor 33 are measured. A temperature sensor 6; a dust sensor 9 for measuring the amount of dust attached to the installation portion; and a transmitter 42 for transmitting the measurement results of the temperature sensor 6 and the dust sensor 9 to the outside. The second core 22 is in contact with the conductor 33 so as to surround the conductor 33.

Description

  The present invention relates to a state monitoring device for electrical equipment for constantly monitoring the temperature of a high-voltage main circuit charging part of a metal closed switchgear and the adhesion state of dust.

Generally, a metal closed switchgear houses a vacuum circuit breaker, main bus, current transformer, external cable, etc. inside the housing, and the vacuum circuit breaker, current transformer, external cable from the bus. It is the structure which supplies electric power to load via.
The vacuum circuit breaker is generally a drawer type, and the vacuum circuit breaker is provided with wheels. A circuit is formed by electrically connecting the primary and secondary terminals of the fixed frame arranged in the housing via the contact, and the circuit is disconnected when the contact is separated. In addition, the current flowing in the main circuit is switched on and off at a contact point inside the vacuum valve mounted on the vacuum circuit breaker.

In the vacuum circuit breaker, since the terminal and the contact are repeatedly connected and disconnected as described above, grease is applied to the contact portion. While using the vacuum circuit breaker for a long period of time, dust or sand adheres to or enters the contact area, and the oil and fat contained in the grease evaporates and dries to a fixed state, which makes the contact area highly resistant. Fever. If left in this state, there is a possibility that the insulation may burn out due to abnormal heating.
On the other hand, generally, maintenance is periodically performed, and countermeasures against the above are performed by cleaning and lubricating. However, since it is impossible to quantitatively indicate whether or not the abnormality of the contact portion has been reliably removed, there is no guarantee that burnout can be reliably prevented. Moreover, since the metal closed type switchgear has a high-voltage charging part inside, a power outage is necessary to carry out maintenance, and if this is performed regularly, the production efficiency of the entire equipment will be reduced. .
In order to solve this, the state monitoring device of electrical equipment is equipped with an insulator with various sensors embedded in a metal closed switchgear, so that the sensor temperature and insulation deterioration due to partial discharge, etc. It was made possible to confirm the reliable removal of abnormality by collecting various data wirelessly from the data (see, for example, Patent Document 1).

Japanese Patent No. 44889797 (paragraph 0017, FIG. 2)

  In the state monitoring device for electrical equipment mounted on a conventional metal closed switchgear disclosed in Patent Document 1, various data can be collected by a sensor, but the sensor is embedded in an insulator. It was difficult to add to the existing metal closed switchgear, and it was also difficult to replace the state monitoring device due to a failure of the sensor in the insulator.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an electrical equipment state monitoring apparatus that can be easily attached and detached.

  An electrical equipment state monitoring apparatus according to the present invention includes a first core and a second core disposed around a conductor to be energized, and is guided by energization of the conductor wound around a part of the second core. A coil that generates a voltage; a temperature sensor that measures the temperature of the conductor; a dust sensor that measures the amount of dust attached to the installation part; and a transmitter that transmits measurement results of the temperature sensor and the dust sensor to the outside. And the first core and the second core are in contact with each other so as to surround the conductor.

  According to the present invention, the first and second cores disposed around the conductor to be energized, and the coil that is wound around a part of the second core and generates an induced voltage by energization of the conductor; A temperature sensor that measures the temperature of the conductor, a dust sensor that measures the amount of dust attached to the installation unit, and a transmitter that transmits the measurement results of the temperature sensor and the dust sensor to the outside. Since the core and the second core are in contact with each other and are disposed so as to surround the conductor, it is possible to obtain a state monitoring device for an electrical device that can be easily mounted and removed.

It is a side view of the vacuum circuit breaker which fixes the state monitoring apparatus of the electric equipment which shows Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of the state monitoring apparatus of the electric equipment which shows Embodiment 1 of this invention. It is sectional drawing of the state monitoring apparatus of the electric equipment by the AA line of FIG. It is a bottom view of the state monitoring apparatus of the electric equipment which shows Embodiment 1 of this invention. It is a perspective view which shows the combination of the bobbin and contactor of Embodiment 1 of this invention. It is a figure which shows the insulator surface of the dust sensor which shows Embodiment 1 of this invention. It is a figure which shows the board | substrate surface of the state monitoring apparatus of the electric equipment which shows Embodiment 1 of this invention. It is a front view of the state monitoring apparatus of the electric equipment which shows Embodiment 2 of this invention. It is sectional drawing of the state monitoring apparatus of the electric equipment by the BB line of FIG. It is a figure which shows the board | substrate surface of the state monitoring apparatus of the electric equipment which shows Embodiment 2 of this invention. It is a figure which shows the board | substrate surface of the state monitoring apparatus of the electric equipment which shows Embodiment 3 of this invention. It is a figure which shows the board | substrate back surface of the state monitoring apparatus of the electric equipment which shows Embodiment 3 of this invention. It is another shape figure which shows the board | substrate surface of the state monitoring apparatus of the electric equipment which shows Embodiment 3 of this invention. It is a figure which shows the board | substrate surface of the state monitoring apparatus of the electric equipment which shows Embodiment 4 of this invention. It is a figure which shows the board | substrate back surface of the state monitoring apparatus of the electric equipment which shows Embodiment 4 of this invention.

Examples of the present invention will be specifically described below.
Embodiment 1 FIG.

A vacuum circuit breaker 30 shown in FIG. 1 is housed in a metal closed switchgear (not shown) so that it can be pulled out. The vacuum circuit breaker 30 is connected to the main circuit of the metal closed switchgear by moving the switchgear-side conductor 46 provided in the metal closed switchgear and the contact 2 provided in the vacuum circuit breaker 30 close to each other. And disconnect. The electrical equipment state monitoring device 1 is provided on a conductor that electrically connects the contact 2 provided in the vacuum circuit breaker 30 and the main circuit in the vacuum circuit breaker 30, that is, the main circuit conductor 33. As shown in FIG. 2 to FIG. 4, the state monitoring apparatus for electrical equipment includes a first core, that is, a core 21 and a second core, that is, cores 22A and 22B, as power supply cores provided around the main circuit conductor 33. It is configured. The core 21 has a U shape and is disposed so as to surround the upper side and the side of the main circuit conductor 33. The cores 22A and 22B are disposed below the main circuit conductor 33, and are fastened to the core 21 with screws (not shown). A bobbin 4 made of an insulating material is fixed to the core 21. As shown in FIG. 5, the bobbin 4 includes a wide width portion 4 </ b> A and a wide width portion 4 </ b> A at both ends, and includes a connection portion 4 </ b> B that is narrower than the wide width portion, and the wide portion 4 </ b> A is in contact with the main circuit conductor 33. The two bobbins 4 sandwich the core 21 from both sides. The bobbin 4 is fixed to the core 21 by winding the coil 3 so as to straddle the two connecting portions 4B of the two bobbins 4 with the core 21 sandwiched from both sides. In addition, a range in which the coil 3 is wound is determined by winding the coil 3 around the connecting portion B of the bobbin 4. The bobbin 4 has another function. One is that the bobbin 4 is applied to the main circuit conductor 33 to provide a space gap between the main circuit conductor 33 and the core 21 and fix the position in the core 21. Yes. The other is that the dust sensor insulator 8 of the dust sensor 9 can be fixed to the bobbin 4. The dust sensor insulator 8 is fixed so that the surface of the dust sensor insulator 8 shown in FIG. 6 (the surface on which the comb-shaped electrode is provided) faces outward and the upper surface of the dust sensor is easily attached. Fix to the bobbin 4. The dust sensor insulator 8 is sized to cover the entire upper surface of the state monitoring device of the electrical equipment. Further, the core 22A and the core 22B are separated from each other in order to suppress heat generation due to the eddy current generated by the energization current of the main circuit conductor 33. The insulator 7 to which the temperature sensor, that is, the thermistor 6 is fixed, is fixed to the separated portion. The insulator 7 has a shape in which a protrusion 11 is provided on the opposite side of the core 22A and the core 22B, and the substrate 5 can be fixed with a screw or the like. The substrate 5 has a temperature measurement unit 43 for controlling the thermistor 6, a leakage current detection unit 41 for controlling the dust sensor 9, and the measurement values obtained by the thermistor 6 and the dust sensor 9 by wireless communication in a control room in the panel. A transmitting unit, that is, a wireless communication unit 42 for transmitting to an arranged receiver (not shown) is attached.
An electrode 40 to which the voltage output from the coil 3 is applied is formed on the surface of the dust sensor insulator 8 constituting the dust sensor 9. The electrode 40 is composed of a comb-shaped electrode 40A and a comb-shaped electrode 40B which are arranged so as to face each other with a distance between the electrodes determined by an arbitrary dimension, and a part of the surface of the insulator 8 for the dust sensor. Or they are arranged throughout. FIG. 6 shows the electrodes.

Next, the operation of the state monitoring apparatus for electric equipment configured as described above will be described with reference to FIGS.
When a current is passed through the main circuit conductor 33, an electric field is generated in the core 21, the core 22A, and the core 22B, and a voltage is generated between the terminals of the coil 3 by the generated electric field. This voltage is applied to the comb electrode 40A and the comb electrode 40B on the surface of the dust sensor insulator 8. If the sun is shallow after installing the state monitoring device of the electrical equipment, dust is not attached to the surface of the insulator 8, and insulation is maintained between the comb-shaped electrode 40A and the comb-shaped electrode 40B. The electrode 40 does not generate a leakage current. However, if dust adheres to the surface of the dust sensor insulator 8, the insulation resistance between the comb-shaped electrode 40A and the comb-shaped electrode 40B decreases, so that a leakage current is generated in the electrode 40. The leakage current detection unit 41 detects this leakage current. Further, the voltage obtained between the terminals of the coil 3 activates the substrate 5, and the information obtained by the thermistor 6 that is in contact with the surface of the main circuit conductor 33 is transmitted together with the leakage current value through the wireless communication, the metal closed switch The data is received by a receiver (not shown) arranged in a control room (not shown) in the gear panel.
Although the state monitoring device of the electric equipment is arranged at each measurement site, the number of receivers is one in the panel or several in the array in which a plurality of metal closed switchgears are arranged in a row. An address is assigned to the receiver side to prevent interference during transmission and reception.

According to the first embodiment, the core 21 and the cores 22A and 22B are attached so as to surround the main circuit conductor 33. Therefore, the state monitoring device for the electric device can be easily added to the existing metal closed switchgear. It is also possible to easily replace the state monitoring device of the electric device due to a failure of the state monitoring device of the electric device.
Further, by sandwiching the main circuit conductor 33 between the bobbin 4 and the insulator 7, it is possible to position the state monitoring device of the electric device with respect to the main circuit conductor 33, and to perform temperature and leakage current by wireless communication. Can always be monitored to know that the main circuit conductor 33 is normal. That is, the maintenance cycle can be extended because the part is normal. In addition, since an abnormality sign of the main circuit conductor 33 can be grasped in advance, maintenance can be planned before an accident occurs.
Further, when the vacuum circuit breaker 30 is put in and out with a large amount of dust and sand near the contact portion of the vacuum circuit breaker 30, the dust and sand adhere to and mix with the grease, and the contact resistance tends to increase. However, since the state monitoring device for electrical equipment of the present application can simultaneously measure the temperature and the adhesion of dust, even if there is no abnormality in the temperature, if the leakage current value due to the adhesion of dust becomes an abnormality determination, the maintenance is performed. The cause of the abnormality can be identified from the relationship between temperature and leakage current. The reverse is also true.
Further, the dust sensor insulator 8 is provided on the upper surface of the state monitoring device of the electric device, and the comb electrode 40A and the comb electrode 40B are provided on almost the entire surface of the dust sensor insulator 8 so as to cover the entire upper surface. Therefore, the comb-shaped electrode 40A and the comb-shaped electrode 40B can be arranged in a wide area, and the adhesion of dust can be detected with higher accuracy even if there is a bias in the adhesion of dust.

  Here, the thermistor is used as a means for measuring the temperature. However, the thermistor is not limited to this and may be a thermocouple.

Embodiment 2. FIG.
FIG. 8 is a front view of the state monitoring device for electric equipment according to the second embodiment, FIG. 9 is a cross-sectional view taken along line BB in FIG. 8, and FIG. 10 shows the substrate surface of the state monitoring device for electric equipment. In addition, the same code | symbol in a figure shows the same or equivalent part, and the description is abbreviate | omitted.
The difference from the first embodiment is that the comb electrodes 40A and 40B provided as the electrodes 40 of the dust sensor are provided on the substrate 5. For this reason, the upper and lower sides of the state monitoring device of the electric device are switched from those of the first embodiment so that the substrate 5 provided with the comb electrodes 40A and 40B faces the upper surface. Further, since the comb electrodes 40A and 40B are provided on the substrate 5, the dust sensor insulator 8 is omitted.

  According to the second embodiment, the dust sensor insulator 8 provided with the comb-shaped electrode as the dust sensor is not necessary, and the functions can be concentrated on the substrate 5 of the state monitoring device of the electric device. Can be reduced.

Embodiment 3 FIG.
FIG. 11 is a diagram of the front surface of the substrate 5 of the electrical equipment state monitoring apparatus according to the third embodiment, and FIG. 12 is a diagram of the back surface of the substrate 5 of FIG. FIG. 13 is another shape diagram of the surface of the substrate 5 of the dust sensor according to the third embodiment. In addition, the same code | symbol in a figure shows the same or equivalent part, and the description is abbreviate | omitted.
The difference from Embodiments 1 and 2 is the shape of the electrodes provided on the substrate of the state monitoring device for electrical equipment. Using the pattern of the substrate 5, the surface is provided with one central electrode 44A at the center of the peripheral electrode, that is, the rectangular electrode 44B, as shown in FIG. In FIG. 11, seven horizontal and two vertical center electrodes 44A and a rectangular electrode 44B are arranged. The rectangular electrode 44B performs wiring with the leakage current detection unit 41 using the pattern of the front substrate 5 and the center electrode 44A uses the pattern of the back substrate 5 as shown in FIG. 41 and wiring.
Further, since the electrode 44 is composed of the center electrode 44A and the rectangular electrode 44B, the electrode 44 can be disposed at an arbitrary position as shown in FIG.

Next, the operation of the electrical equipment state monitoring apparatus configured as described above will be described with reference to FIG.
As in the first embodiment, when a current is passed through the main circuit conductor 33, an electric field is generated in the core 21, the core 22A, and the core 22B, and a voltage is generated between the terminals of the coil 3 due to the generated electric field. This voltage is applied to the center electrode 44A and the square electrode 44B. Then, a concentric electric field centered on the central electrode 44A is formed in the rectangular electrode 44B. Here again, as in the first embodiment, if no dust adheres to the surface of the substrate 5, insulation is maintained between the center electrode 44A and the rectangular electrode 44B. Does not occur. However, if dust adheres to the surface of the substrate 5, the insulation resistance between the center electrode 44 </ b> A and the square electrode 44 </ b> B decreases, and a leakage current is generated in the electrode 44. The leakage current detection unit 41 detects this leakage current.

  According to the third embodiment, since the electrode shape can be freely formed by using the rectangular electrode 44B as a base as shown in FIG. 11, the space of the substrate 5 can be used effectively.

  Here, the quadrangular rectangular electrode is used as the surrounding electrode, but it may be circular or pentagonal as long as the central electrode can be disposed so as to surround it with a space.

Embodiment 4 FIG.
FIG. 14 is a diagram of the front surface of the substrate 5 of the electrical equipment state monitoring apparatus according to the fourth embodiment, and FIG. 15 is a diagram of the back surface of the substrate 5 of FIG.
The difference from the third embodiment is that one central electrode 45A is provided at the center of each of the plurality of rectangular electrodes 45B, but the output of each central electrode 45A is taken out separately as shown in FIG. That is.

  According to the fourth embodiment, it is possible to individually measure the leakage current of each central electrode 45A by making the outputs of the respective central electrodes 45A separately based on the plurality of rectangular electrodes 45B. As a result, the distribution state of the amount of dust attached is known, and from the distribution state of the amount of dust attached, the dust inside the metal closed-type switchgear is easy to attach if it is close to the part where the dust enters. It is possible to specify the site and direction to enter.

DESCRIPTION OF SYMBOLS 1 Electric equipment state monitoring device 2 Contact 3 Coil 4 Bobbin 4A Wide part 4B Connection part 5 Board | substrate 6 Thermistor 7 Insulator 8 Dust sensor insulator 9 Dust sensor 11 Protrusion 21, 22, A, 22B Core 30 Vacuum circuit breaker 33 Main circuit conductors 40, 44, 45 Electrodes 40A, 40B Comb electrodes 41 Leakage current detection unit 42 Wireless communication unit 43 Temperature measurement units 44A, 45A Center electrodes 44B, 45B Square electrode 46 Switch gear side conductor

  The present invention relates to a state monitoring device for electrical equipment for constantly monitoring the temperature of a high-voltage main circuit charging part of a metal closed switchgear and the adhesion state of dust.

Generally, a metal closed switchgear houses a vacuum circuit breaker, main bus, current transformer, external cable, etc. inside the housing, and the vacuum circuit breaker, current transformer, external cable from the bus. It is the structure which supplies electric power to load via.
The vacuum circuit breaker is generally a drawer type, and the vacuum circuit breaker is provided with wheels. A circuit is formed by electrically connecting the primary and secondary terminals of the fixed frame arranged in the housing via the contact, and the circuit is disconnected when the contact is separated. In addition, the current flowing in the main circuit is switched on and off at a contact point inside the vacuum valve mounted on the vacuum circuit breaker.

In the vacuum circuit breaker, since the terminal and the contact are repeatedly connected and disconnected as described above, grease is applied to the contact portion. While using a vacuum circuit breaker for a long time, dust, such as dust and sand is adhered or mixed into the contact portion, also become stuck grease contained in the grease is evaporated to dryness, the contact portion is high-resistance It generates heat. If left in this state, there is a possibility that the insulation may burn out due to abnormal heating.
On the other hand, generally, maintenance is periodically performed, and countermeasures against the above are performed by cleaning and lubricating. However, since it is impossible to quantitatively indicate whether or not the abnormality of the contact portion has been reliably removed, there is no guarantee that burnout can be reliably prevented. Moreover, since the metal closed type switchgear has a high-voltage charging part inside, a power outage is necessary to carry out maintenance, and if this is performed regularly, the production efficiency of the entire equipment will be reduced. .
In order to solve this, the state monitoring device of electrical equipment is equipped with an insulator with various sensors embedded in a metal closed switchgear, so that the sensor temperature and insulation deterioration due to partial discharge, etc. It was made possible to confirm the reliable removal of abnormality by collecting various data wirelessly from the data (see, for example, Patent Document 1).

Japanese Patent No. 44889797 (paragraph 0017, FIG. 2)

  In the state monitoring device for electrical equipment mounted on a conventional metal closed switchgear disclosed in Patent Document 1, various data can be collected by a sensor, but the sensor is embedded in an insulator. It was difficult to add to the existing metal closed switchgear, and it was also difficult to replace the state monitoring device due to a failure of the sensor in the insulator.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an electrical equipment state monitoring apparatus that can be easily attached and detached.

Status monitoring device of electrical apparatus according to the present invention comprises a core disposed around the conductor to energize a coil wound around a part of the previous Kiko A generates an induced voltage by energization of said conductor a temperature sensor for measuring temperature of the conductor, and the dust sensor for measuring the amount of adhered dust of the installation unit, a transmission unit for transmitting the measurement result of the temperature sensor and the dust sensor to the outside, which was e Bei the is there.

According to the present invention, a core disposed around the conductor to energize, before a coil wound around a portion of the logger A generates an induced voltage by energization of the conductors, the temperature of the conductor a temperature sensor for measuring a dust sensor for measuring the amount of adhered dust of the installation unit, a transmission unit for transmitting the measurement result of the temperature sensor and the dust sensor to the outside, since the Bei Eteiru, easy to install and remove It is possible to obtain a state monitoring apparatus for a simple electrical device.

It is a side view of the vacuum circuit breaker which fixes the state monitoring apparatus of the electric equipment which shows Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of the state monitoring apparatus of the electric equipment which shows Embodiment 1 of this invention. It is sectional drawing of the state monitoring apparatus of the electric equipment by the AA line of FIG. It is a bottom view of the state monitoring apparatus of the electric equipment which shows Embodiment 1 of this invention. It is a perspective view which shows the combination of the bobbin and contactor of Embodiment 1 of this invention. It is a figure which shows the insulator surface of the dust sensor which shows Embodiment 1 of this invention. It is a figure which shows the board | substrate surface of the state monitoring apparatus of the electric equipment which shows Embodiment 1 of this invention. It is a front view of the state monitoring apparatus of the electric equipment which shows Embodiment 2 of this invention. It is sectional drawing of the state monitoring apparatus of the electric equipment by the BB line of FIG. It is a figure which shows the board | substrate surface of the state monitoring apparatus of the electric equipment which shows Embodiment 2 of this invention. It is a figure which shows the board | substrate surface of the state monitoring apparatus of the electric equipment which shows Embodiment 3 of this invention. It is a figure which shows the board | substrate back surface of the state monitoring apparatus of the electric equipment which shows Embodiment 3 of this invention. It is another shape figure which shows the board | substrate surface of the state monitoring apparatus of the electric equipment which shows Embodiment 3 of this invention. It is a figure which shows the board | substrate surface of the state monitoring apparatus of the electric equipment which shows Embodiment 4 of this invention. It is a figure which shows the board | substrate back surface of the state monitoring apparatus of the electric equipment which shows Embodiment 4 of this invention.

Examples of the present invention will be specifically described below.

Embodiment 1 FIG.
A vacuum circuit breaker 30 shown in FIG. 1 is housed in a metal closed switchgear (not shown) so that it can be pulled out. The vacuum circuit breaker 30 is connected to the main circuit of the metal closed switchgear by moving the switchgear-side conductor 46 provided in the metal closed switchgear and the contact 2 provided in the vacuum circuit breaker 30 close to each other. And disconnect. The electrical equipment state monitoring device 1 is provided on a conductor that electrically connects the contact 2 provided in the vacuum circuit breaker 30 and the main circuit in the vacuum circuit breaker 30, that is, the main circuit conductor 33. As shown in FIG. 2 to FIG. 4, the state monitoring apparatus for electrical equipment includes a first core, that is, a core 21 and a second core, that is, cores 22A and 22B, as power supply cores provided around the main circuit conductor 33. It is configured. The core 21 has a U shape and is disposed so as to surround the upper side and the side of the main circuit conductor 33. The cores 22A and 22B are disposed below the main circuit conductor 33, and are fastened to the core 21 with screws (not shown). A bobbin 4 made of an insulating material is fixed to the core 21. As shown in FIG. 5, the bobbin 4 includes a wide width portion 4 </ b> A and a wide width portion 4 </ b> A at both ends, and includes a connection portion 4 </ b> B that is narrower than the wide width portion, and the wide portion 4 </ b> A is in contact with the main circuit conductor 33. The two bobbins 4 sandwich the core 21 from both sides. The bobbin 4 is fixed to the core 21 by winding the coil 3 so as to straddle the two connecting portions 4B of the two bobbins 4 with the core 21 sandwiched from both sides. In addition, a range in which the coil 3 is wound is determined by winding the coil 3 around the connecting portion B of the bobbin 4. The bobbin 4 has another function. One is that the bobbin 4 is applied to the main circuit conductor 33 to provide a space gap between the main circuit conductor 33 and the core 21 and fix the position in the core 21. Yes. The other is that the dust sensor insulator 8 of the dust sensor 9 can be fixed to the bobbin 4. Fixing the orientation of the dust sensor insulator 8 toward the upper surface so as to facilitate attachment to the surface of the dust sensor insulator 8 shown in FIG. 6 (the surface on which comb-shaped electrode is provided) is outwardly and dust Fix to the bobbin 4. The dust sensor insulator 8 is sized to cover the entire upper surface of the state monitoring device of the electrical equipment. Further, the core 22A and the core 22B are separated from each other in order to suppress heat generation due to the eddy current generated by the energization current of the main circuit conductor 33. The insulator 7 to which the temperature sensor, that is, the thermistor 6 is fixed, is fixed to the separated portion. The insulator 7 has a shape in which a protrusion 11 is provided on the opposite side of the core 22A and the core 22B, and the substrate 5 can be fixed with a screw or the like. The substrate 5 has a temperature measurement unit 43 for controlling the thermistor 6, a leakage current detection unit 41 for controlling the dust sensor 9, and the measurement values obtained by the thermistor 6 and the dust sensor 9 in a control room in the panel by wireless communication. A transmitting unit, that is, a wireless communication unit 42 for transmitting to an arranged receiver (not shown) is attached.
An electrode 40 to which the voltage output from the coil 3 is applied is formed on the surface of the dust sensor insulator 8 constituting the dust sensor 9. The electrode 40 is composed of a comb-shaped electrode 40A and a comb-shaped electrode 40B which are arranged so as to face each other with a distance between the electrodes determined by an arbitrary dimension, and a part of the surface of the insulator 8 for the dust sensor. Or they are arranged throughout. FIG. 6 shows the electrodes.

Next, the operation of the state monitoring apparatus for electric equipment configured as described above will be described with reference to FIGS.
When a current is passed through the main circuit conductor 33, an electric field is generated in the core 21, the core 22A, and the core 22B, and a voltage is generated between the terminals of the coil 3 by the generated electric field. This voltage is applied to the comb electrode 40A and the comb electrode 40B on the surface of the dust sensor insulator 8. If the day after installation of the state monitoring device for the electrical equipment is shallow, no dust adheres to the surface of the dust sensor insulator 8, and insulation is maintained between the comb electrode 40A and the comb electrode 40B. Therefore, no leakage current is generated in the electrode 40. However, when dust adheres to the surface of the dust sensor insulator 8, the leakage current at the electrode 40 is generated since the insulating resistance between the comb-shaped electrode 40A and the comb-shaped electrode 40B is reduced. The leakage current detection unit 41 detects this leakage current. Further, the voltage obtained between the terminals of the coil 3 activates the substrate 5, and the information obtained by the thermistor 6 that is in contact with the surface of the main circuit conductor 33 is transmitted together with the leakage current value through the wireless communication, the metal closed switch The data is received by a receiver (not shown) arranged in a control room (not shown) in the gear panel.
Although the state monitoring device of the electric equipment is arranged at each measurement site, the number of receivers is one in the panel or several in the array in which a plurality of metal closed switchgears are arranged in a row. An address is assigned to the receiver side to prevent interference during transmission and reception.

According to the first embodiment, the core 21 and the cores 22A and 22B are attached so as to surround the main circuit conductor 33. Therefore, the state monitoring device for the electric device can be easily added to the existing metal closed switchgear. It is also possible to easily replace the state monitoring device of the electric device due to a failure of the state monitoring device of the electric device.
Further, by sandwiching the main circuit conductor 33 between the bobbin 4 and the insulator 7, it is possible to position the state monitoring device of the electric device with respect to the main circuit conductor 33, and to perform temperature and leakage current by wireless communication. Can always be monitored to know that the main circuit conductor 33 is normal. That is, the maintenance cycle can be extended because the part is normal. In addition, since an abnormality sign of the main circuit conductor 33 can be grasped in advance, maintenance can be planned before an accident occurs.
Further, when the vacuum circuit breaker 30 is put in and out with a large amount of dust and sand near the contact portion of the vacuum circuit breaker 30, the dust and sand adhere to and mix with the grease, and the contact resistance tends to increase. However, the electrical equipment state monitoring device of the present application can measure temperature and dust adhesion at the same time, so if the leakage current value due to dust adhesion is judged to be abnormal even if there is no abnormality in temperature, maintenance is performed. The cause of the abnormality can be identified from the relationship between temperature and leakage current. The reverse is also true.
Further, the dust sensor insulator 8 is provided on the upper surface of the state monitoring device of the electric device, and the comb electrode 40A and the comb electrode 40B are provided on almost the entire surface of the dust sensor insulator 8 so as to cover the entire upper surface. because, it is possible to place the comb-shaped electrode 40A and the comb-shaped electrode 40B in a wide area, it can be detected more accurately adhesion of dust even if there is deviation in the adhesion of dust.

  Here, the thermistor is used as a means for measuring the temperature. However, the thermistor is not limited to this and may be a thermocouple.

Embodiment 2. FIG.
FIG. 8 is a front view of the state monitoring device for electric equipment according to the second embodiment, FIG. 9 is a cross-sectional view taken along line BB in FIG. 8, and FIG. 10 shows the substrate surface of the state monitoring device for electric equipment. In addition, the same code | symbol in a figure shows the same or equivalent part, and the description is abbreviate | omitted.
The difference from the first embodiment is that the comb electrodes 40A and 40B provided as the electrodes 40 of the dust sensor are provided on the substrate 5. For this reason, the upper and lower sides of the state monitoring device of the electric device are switched from those of the first embodiment so that the substrate 5 provided with the comb electrodes 40A and 40B faces the upper surface. Further, since the comb electrodes 40A and 40B are provided on the substrate 5, the dust sensor insulator 8 is omitted.

  According to the second embodiment, the dust sensor insulator 8 provided with the comb-shaped electrode as the dust sensor is not necessary, and the functions can be concentrated on the substrate 5 of the state monitoring device of the electric device. Can be reduced.

Embodiment 3 FIG.
FIG. 11 is a diagram of the front surface of the substrate 5 of the electrical equipment state monitoring apparatus according to the third embodiment, and FIG. 12 is a diagram of the back surface of the substrate 5 of FIG. FIG. 13 is another shape diagram of the surface of the substrate 5 of the dust sensor according to the third embodiment. In addition, the same code | symbol in a figure shows the same or equivalent part, and the description is abbreviate | omitted.
The difference from Embodiments 1 and 2 is the shape of the electrodes provided on the substrate of the state monitoring device for electrical equipment. Using the pattern of the substrate 5, the surface is provided with one central electrode 44A at the center of the peripheral electrode, that is, the rectangular electrode 44B, as shown in FIG. In FIG. 11, seven horizontal and two vertical center electrodes 44A and a rectangular electrode 44B are arranged. The rectangular electrode 44B performs wiring with the leakage current detection unit 41 using the pattern of the front substrate 5 and the center electrode 44A uses the pattern of the back substrate 5 as shown in FIG. 41 and wiring.
Further, since the electrode 44 is composed of the center electrode 44A and the rectangular electrode 44B, the electrode 44 can be disposed at an arbitrary position as shown in FIG.

Next, the operation of the electrical equipment state monitoring apparatus configured as described above will be described with reference to FIG.
As in the first embodiment, when a current is passed through the main circuit conductor 33, an electric field is generated in the core 21, the core 22A, and the core 22B, and a voltage is generated between the terminals of the coil 3 due to the generated electric field. This voltage is applied to the center electrode 44A and the square electrode 44B. Then, a concentric electric field centered on the central electrode 44A is formed in the rectangular electrode 44B. Again, as in the first embodiment, if no dust adheres to the surface of the substrate 5, insulation is maintained between the center electrode 44A and the square electrode 44B, so that leakage current is generated in the electrode 44. Does not occur. However, if dust adheres to the surface of the substrate 5, the insulation resistance between the center electrode 44 </ b> A and the square electrode 44 </ b> B decreases, and a leakage current is generated in the electrode 44. The leakage current detection unit 41 detects this leakage current.

  According to the third embodiment, since the electrode shape can be freely formed by using the rectangular electrode 44B as a base as shown in FIG. 11, the space of the substrate 5 can be used effectively.

  Here, the quadrangular rectangular electrode is used as the surrounding electrode, but it may be circular or pentagonal as long as the central electrode can be disposed so as to surround it with a space.

Embodiment 4 FIG.
FIG. 14 is a diagram of the front surface of the substrate 5 of the electrical equipment state monitoring apparatus according to the fourth embodiment, and FIG. 15 is a diagram of the back surface of the substrate 5 of FIG.
The difference from the third embodiment is that one central electrode 45A is provided at the center of each of the plurality of rectangular electrodes 45B, but the output of each central electrode 45A is taken out separately as shown in FIG. That is.

According to the fourth embodiment, it is possible to individually measure the leakage current of each central electrode 45A by making the outputs of the respective central electrodes 45A separately based on the plurality of rectangular electrodes 45B. Thus to understand the distribution state of the amount of adhered dust, from the distribution of the adhesion amount of the dust, the closer to the site to enter the dust, such as easy to adhere dust, dust inside the metal enclosed type switchgear It is possible to specify the site and direction to enter.

1 Electrical equipment status monitoring device, 2 contacts, 3 coils, 4 bobbins,
4A wide part, 4B connecting part, 5 substrate, 6 thermistor, 7 insulator,
8 Insulator for dust sensor, 9 dust sensor, 11 protrusion,
21, 22A, 22B core, 30 vacuum circuit breaker, 33 main circuit conductor,
40, 44, 45 electrodes, 40A, 40B comb electrodes, 41 leakage current detector,
42 wireless communication unit, 43 temperature measurement unit, 44A, 45A center electrode,
44B, 45B Square electrode, 46 Switch gear side conductor.

Claims (4)

First and second cores disposed around a conducting conductor;
A coil wound around a part of the second core and generating an induced voltage by energizing the conductor;
A temperature sensor for measuring the temperature of the conductor;
A dust sensor for measuring the amount of dust attached to the installation part;
A transmission unit for transmitting the measurement results of the temperature sensor and the dust sensor to the outside,
An apparatus for monitoring a state of an electric device, wherein the first core and the second core are in contact with each other so as to surround the conductor.   The coil is wound, the first core is sandwiched, the first core and the conductor are arranged with a space in contact with the conductor, and a pair of bobbins made of an insulator are provided. The state monitoring device for an electrical device according to claim 1, wherein the device is a state monitoring device.   3. The state monitoring apparatus for an electric device according to claim 1, wherein the dust sensor is arranged on the surface of an insulator with two comb electrodes facing each other with a gap therebetween.   The apparatus for monitoring the state of an electric device according to claim 1 or 2, wherein the dust sensor includes a center electrode and a peripheral electrode arranged around the center electrode, and is disposed on a surface of an insulator. .

Images