JPH0671206B2 - Temperature sensor device with wireless transmitter for high voltage conductors - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a temperature sensor device with a wireless transmitter for a high voltage conductor, which is attached to an existing high voltage conductor to detect and monitor an abnormal temperature rise.

[Prior Art] Various sensors such as a temperature sensor, a magnetic sensor, a pressure sensor, and a limit switch are used to detect the situation of various devices, and the detection signals are wirelessly transmitted to a monitoring station to perform various monitoring and control. In this case, a wireless transmitter powered by a battery is combined with various sensors, and the detection signal is transmitted from an antenna of the wireless transmitter and received by the wireless receiver for monitoring and control.

Such a radio transmitter may be provided with an antenna housed in a plastic case, or the
As shown in FIG. 10 and FIG. 10, a part of the metal case 40 is insulated and the antenna 41 is provided so as to be exposed from the metal case 40.

[Problems to be Solved by the Invention] When it is necessary to attach an abnormal temperature detection sensor to a high-voltage conductor to detect an abnormal temperature, the plastic case deteriorates due to tracking due to corona discharge of the high-voltage conductor for a long period of time. Therefore, a metal case will be used for the high-voltage charging section. However, since the antenna is exposed in the conventional wireless transmitter housed in a metal case, there is a risk that the antenna may come into contact with the high-voltage charging unit and be destroyed. Cannot safely detect abnormal temperatures of high-voltage conductors.

As the antenna provided in the metal case, a pilot wire for temperature detection is attached to the cable conductor and embedded in the entire length of the cable as in the cable temperature remote reading / monitoring device of US Pat. Change in the temperature of the cable conductor is detected by the change in the resistance value of the pilot wire due to the change in temperature, and the antenna that transmits this detection signal is mounted on the surface of the conductive metal housing that houses the transmitter, and its antenna element projects from the conductive metal plate surface. There is known an apparatus having a structure in which the front surface is closed by a cylindrical wall made of plastic such as acrylic resin.

In the device for monitoring the cable temperature by the pilot wire, the insulating plate in front of the antenna is a plastic plate, so if it is attached to a high-voltage conductor, the corona discharge will deteriorate and damage the plastic insulating plate, and the conductive metal plate on the surface of the metal housing. There is a problem in that the antenna element protruding from the surface comes into contact with the high-voltage charging unit and the transmitter is destroyed.

Further, the cable temperature monitoring device using the pilot wire is to embed the pilot wire along the cable conductor over the entire length of the cable.
Since it cannot be attached to an exposed high-voltage conductor such as an already-installed high-voltage bus bar, there is a problem in that it is not possible to detect or monitor an abnormal temperature rise in the existing high-voltage conductor, and the pilot Since it detects the temperature change of the entire cable laid by changing the resistance value of the total wire length, it should be detected up to the point where the abnormal temperature rise occurred in the cable laid over a long distance. There is a problem that you cannot do it.

The present invention solves the above-mentioned problems and is equipped with a radio transmitter for a high-voltage conductor, which can be directly attached to an arbitrary part of a high-voltage conductor to detect an abnormal temperature rise occurrence and a place where the abnormal temperature rise occurs without danger. An object is to provide a temperature sensor device.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the temperature sensor device with a wireless transmitter for a high-voltage conductor of the present invention is mounted for mounting a high-voltage conductor from the heat receiving bottom plate portion of the metal case 2 to the outside of the case. A plate 9 is provided so as to protrude, a temperature sensor switch 7 made of a shape memory alloy is provided on the heat receiving bottom plate portion in the metal case 2, and an abnormal temperature of the high voltage conductor is caused by a thermal responsive operation of the temperature sensor switch 7 made of the shape memory alloy. Radio transmitter 5 that sends out a detection signal of occurrence
And the transmitting antenna 6 are housed in the metal case 2, the antenna opening window 3 of the metal case is provided with a protective plate 4 made of an inorganic insulator such as glass or ceramic, and the mounting plate 9 is provided.
Is attached in direct contact with the high-voltage conductor 30.

[Operation] The mounting plate 9 protruding from the heat-receiving bottom plate portion of the metal case 2 to the outside of the case is directly attached to an arbitrary location of the exposed high-voltage conductor 30 which is already installed, and individually mounted. As a result, an abnormal temperature rise of the high-voltage conductor at the mounting position is detected, so that it is possible to detect and notify in which part of the existing high-voltage conductor the abnormal temperature rise has occurred.

Since the transmitting antenna 6 is provided inside the inorganic insulating protective plate 4 of the antenna opening 3 of the metal case 2 and is not exposed to the outside of the case, the sensor device with wireless transmitter 1 is attached to the high voltage conductor 30. Since the antenna 6 does not contact the high-voltage conductor 30 and does not discharge from the high-voltage conductor 30 to the antenna 6, the risk of the transmitter being destroyed by high voltage is prevented.

Since the protective plate 4 provided in the antenna opening window 3 is made of an inorganic insulator, it does not deteriorate like a conventional plastic plate even if it receives corona discharge of a high voltage conductor.

When an abnormal temperature rise occurs in the high-voltage conductor 30, the generated heat is transmitted to the mounting plate 9 and is transmitted to the shape memory alloy temperature sensor switch 7 on the heat receiving bottom plate portion in the metal case 2. When this abnormal heat generation is transmitted to the shape memory alloy temperature sensor switch 7, the shape memory alloy responds to the deformation and turns on or off the switch circuit to output a detection signal of occurrence of abnormal temperature rise.

The detection signal of this abnormal temperature rise is transmitted from the transmission antenna 6 of the wireless transmitter 5, and the transmitted radio wave is radiated through the inorganic insulating protective plate 4 of the opening window 3 of the metal case 2 and transmitted to the receiving station 20, The high-voltage conductor 30 is informed and alarmed that an abnormal temperature rise has occurred.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a front view of a first embodiment of a temperature sensor device with a wireless transmitter for a high voltage conductor according to the present invention, and FIG. 2 shows a side view of the temperature sensor device in a partial cross section, where 1 is a wireless transmitter. Attached temperature sensor device, 2 is its metal case, 3 is an opening window for the antenna in front of the metal case 2, and 4 is this opening window for the antenna 3.
It is a protective plate made of an inorganic insulator such as a glass plate or a ceramic plate that is airtightly attached to.

5 is a wireless transmitter housed in the metal case 2, 6 is its transmitting antenna, and this transmitting antenna 6 is placed inside the protective plate 4 made of an inorganic insulator in the opening window 3 for the antenna. Radio waves are radiated through the insulating protection plate 4.

Reference numeral 7 denotes a temperature sensor switch made of a shape memory alloy such as a Ni-Ti alloy, which is made of a shape memory alloy that deforms at a predetermined temperature and is installed on the heat receiving bottom plate portion in the metal case 2. When the temperature of the high-voltage conductor to which the metal case 2 is attached rises abnormally, the temperature sensor switch 7 operates in response to the heat conduction of the abnormal temperature rise to close or open the temperature sensor switch circuit to prevent abnormal temperature rise. A detection signal is generated, and the detection signal output is radiated from the antenna 6 of the wireless transmitter 5 as a signal radio wave.

8 is provided on the side surface of the metal case 2 and displayed during operation
Reference numeral 9 is an indicator light such as an LED, and 9 is a mounting plate for mounting a high-voltage conductor that protrudes from the heat receiving bottom plate portion of the metal case 2 to the outside of the case. The mounting plate 9 is screwed into direct contact with the high voltage conductor 30.

3 and 4 are cross-sectional views showing another embodiment, and the same reference numerals in FIGS. 1 and 2 indicate the same parts. An antenna opening is provided in the metal case 2 of the sensor device 1 with a wireless transmitter. A window 3 is provided, an inorganic insulating protective plate 4 is airtightly attached to the antenna opening window 3, and a wireless transmitter 5, a transmitting antenna 6 and a shape memory alloy temperature sensor switch 7 are housed in the metal case 2. A mounting plate 9 for mounting the high-voltage conductor is provided so as to protrude from the heat receiving bottom plate portion of the metal case 2 to the outside of the case. Reference numeral 10 is a component of a circuit element of the wireless transmitter 5, and 11 is a battery such as a lithium battery.

FIG. 5 shows still another embodiment, and like the above embodiment, the metal case 2 of the sensor device 1 with a wireless transmitter, the antenna opening window 3 of the metal case 2, and the antenna opening window 3 are hermetically sealed. Inorganic insulator protective plate 4, wireless transmitter 5, transmitting antenna 6, shape memory alloy temperature sensor switch 7, mounting plate for mounting high voltage conductors protruding from the heat-receiving bottom plate of the metal case 2 to the outside of the case The shape memory alloy temperature sensor switch 7 includes a shape memory alloy spring 71, a bias spring 72, and an opening / closing contact 73. 8 is an indicator light such as an LED, 10 is a crystal oscillator, a coil, a transistor and other circuit elements of the wireless transmitter 5, 11
Is a battery.

FIG. 6 shows still another embodiment, and similarly to the above embodiment, an opening window 3 for an antenna is provided in the metal case 2 of the sensor device 1 with a wireless transmitter, and the opening window 3 is provided with a protective plate made of an inorganic insulator. 4, the wireless transmitter 5, the transmission antenna 6, and the shape memory alloy temperature sensor switch 7 are housed in the metal case 2, and the mounting plate 9 for mounting the high-voltage conductor from the heat receiving bottom plate portion of the metal case 2 to the outside of the case. Is provided so as to project.

FIG. 7 shows the above-mentioned sensor device with a wireless transmitter 1 and a receiver on the receiving station side which receives a high voltage conductor abnormal temperature detection signal radio wave transmitted from its transmitting antenna 6 and gives an alarm, A wireless transmitter 5, a transmitting antenna 6, a temperature sensor switch 7 made of a shape memory alloy, and a battery 11 are housed in a metal case 2 of the sensor device 1 with a wireless transmitter, and the antenna opening window 3 of the metal case 2 is made of inorganic material. The radio wave radiated from the transmitting antenna 6 through the insulating protective plate 4 is received by the antenna 22 of the receiver 21 on the transmitting station 20 side, and the relay 23 outputs the alarm signal OV. 24 is AC
It is a power supply unit.

As described above, the wireless transmitter sensor device 1 including the shape memory alloy temperature sensor switch 7 and the wireless transmitter 5 as described above has a height that protrudes from the heat receiving bottom plate portion of the metal case 2 to the outside of the case. The mounting plate 9 for mounting the voltage conductor is brought into direct contact with an arbitrary location of the existing exposed high-voltage conductor 30 and is mounted with a screw or the like.

As described above, by mounting the temperature sensor device with the wireless transmitter of the present invention in contact with the existing exposed high-voltage conductor 30, when the temperature of the high-voltage conductor 30 abnormally rises, the shape memory alloy in the metal case 2 is formed. The temperature sensor switch 7 made responsively operates, the wireless transmitter 5 outputs a detection signal of an abnormal temperature rise, and the abnormal temperature detection signal radio wave is transmitted from the transmission antenna 6 to the antenna opening window 3 of the metal case 2 made of an inorganic insulator. Board 4
Is radiated through. At the same time, the indicator lamp 8 such as an LED blinks to notify an abnormal temperature rise of the high-voltage conductor 30 at the location where the temperature sensor device with the wireless transmitter is attached to give an alarm.

The detection signal transmitted from the transmitting antenna 6 warns the abnormal temperature rise of the high voltage conductor 30 received by the receiving antenna 22 at the receiving station 20.

The wireless transmitter sensor device 1 is mounted on the high-voltage conductor 30 at a large number of appropriate intervals, and the oscillation frequencies of the transmitters that transmit the respective detection signals are made to differ, so that which part of the high-voltage conductor 30 can be detected. You can know if the temperature has risen abnormally.

The wireless transmitter 5 avoids the frequency band for broadcasting and sets the oscillation frequency.
The carrier output is ON-OFF when the oscillation output is 14 μV / m or less at a distance of 100 m using the 140 MHz band, or 300 to 330 MHz in some cases.
As a control method, the receiver 21 is a super-heterodyne method, and signal detection is performed by a squelch signal. Further, the operating temperature of the shape memory alloy sensor switch is, for example, about 75 ° C., and it is possible to operate stably without malfunction.

The size of the metal case is 30 mm in height, 30 mm in width, and 50 mm in length.
A degree is preferable.

Even if the metal case 2 is attached to the high-voltage conductor 30 as described above, the transmitting antenna 6 is inside the inorganic insulating protective plate 4 of the antenna opening window 3 of the metal case 2 and is not exposed. Since it does not touch the high-voltage conductor 30 and does not discharge from the high-voltage conductor 30 to the antenna, the risk of the transmitter being destroyed by high voltage is prevented, and even with a high-voltage conductor of 60 KV, a device for detecting abnormal temperature As a result, it is possible to use it safely and for a long time, and it is possible to realize a safety abnormal temperature detection system for a high-voltage conductor by a wireless system.

[Advantages of the Invention] As described above, in the temperature sensor device with a wireless transmitter for a high-voltage conductor according to the present invention, the mounting plate that is protruded from the heat-receiving bottom plate portion of the metal case to the outside of the case is already installed and is exposed. Since the voltage conductors can be directly attached individually to arbitrary places, it becomes possible to detect and notify in which place of the existing high-voltage conductor the abnormal temperature rise has occurred.

Further, since the transmitting antenna is provided inside the inorganic insulating protective plate of the antenna opening window of the metal case, the antenna does not come into contact with the high voltage conductor even if the temperature sensor device with the wireless transmitter is attached to the high voltage conductor. Also, since there is no discharge from the high-voltage conductor to the antenna, it is possible to safely detect the occurrence of abnormal temperature of the high-voltage conductor without the risk of the transmitter being destroyed by the high voltage.

Furthermore, since the protective plate provided in the opening window for the antenna is made of an inorganic insulator, it does not deteriorate like a conventional plastic plate even if it is attached to a high voltage conductor and subjected to corona discharge.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a side view thereof, FIGS. 3 and 4 are sectional views of other embodiments, and FIG. FIG. 6 is a sectional view of another embodiment, FIG. 6 is a perspective view of yet another embodiment, FIG. 7 is a view showing a sensor and a receiver with a wireless transmitter according to the present invention, and FIG. 9 and 10 are a front view and a sectional view of a conventional example. 1: Sensor device with wireless transmitter 2: Metal case 3: Opening window for antenna 4: Protective plate made of inorganic insulator 5: Wireless transmitter 6: Transmit antenna 7: Temperature sensor switch made of shape memory alloy 9: Mounting plate 30: High voltage conductor

Claims (1)

[Claims] 1. A mounting plate for mounting a high-voltage conductor is provided so as to project from a heat receiving bottom plate portion of a metal case to the outside of the case, and a shape memory alloy temperature sensor switch is provided on the heat receiving bottom plate portion inside the metal case. A wireless transmitter that transmits an abnormal temperature detection signal of a high-voltage conductor by a thermal response operation of a memory alloy temperature sensor switch and a transmitting antenna are housed in the metal case, and an inorganic insulator is provided in the antenna opening window of the metal case. A temperature sensor device with a wireless transmitter for a high-voltage conductor, wherein a protective plate made of metal is provided, and the mounting plate is attached by directly contacting the high-voltage conductor.