KR20030054519A - Automatic Temperature Detecting Apparatus for Bus Clip of High Voltage Circuit Breaker - Google Patents

Abstract

PURPOSE: An automatic abnormal temperature detecting device is provided to be capable of improving a reliability of a power system by remotely monitoring heating owing to abnormal temperature increase at an operation room. CONSTITUTION: A temperature detecting part(7) is installed at a top of a primary booth clip(5) of a high voltage breaker(3) and includes an infrared ray temperature system for measuring the temperature of the clip and a lighting and a camera for taking a picture of the booth clip. A control part(20) receives a temperature measurement value and an image signal from the temperature detecting part(7), reads out a current value from CT of a high voltage panel(1), converts received and read signal values into current signals for PLC and sends the converted current signals to a PLC(17). The PLC(17) sends received values to an MMI(16) and generates an alarm when the temperature measurement value or a current value of the high voltage panel reaches an alarm value established at the MMI. The PLC outputs a trip signal to the control part so as to trip a high voltage breaker when the temperature measurement value or a current value of the high voltage panel reaches a trip value.

Description

Automatic Temperature Detecting Apparatus for Bus Clip of High Voltage Circuit Breaker}

The present invention relates to a device for automatically detecting abnormal temperature generated in a boot clip of a high voltage circuit breaker applied to a large-scale power system such as a steel mill blast furnace facility, and more particularly, a high voltage breaker booth clip abnormal temperature automatic detection device. It installs a temperature detector that automatically operates at the primary side of the breaker (CLIP) of the breaker in the electrical room that accommodates the current, and configures a current detection system and detects the current abnormality. Thus, the present invention relates to a high-voltage breaker booth clip abnormal temperature automatic detection device which prevents heat generation due to poor contact or abnormality of a clip part, thereby preventing breaker damage and secondary accidents.

Figure 1a is a schematic diagram showing the configuration of a general high pressure panel of the blast furnace installation, Figure 1b is a power system diagram of a general high pressure panel of the blast furnace installation, Figure 2 is a three-dimensional configuration diagram of the internal circuit breaker of the high pressure panel of the blast furnace installation.

In the local power system of a typical steel mill blast furnace, 22 kV is supplied from a central power supply (not shown), converted to 6.6 kV from a factory main transformer, and used as a high voltage system operation and control power source. The blast furnace plant consists of an unmanned electric room for each facility, and the power system is operated by supplying a high voltage motor supply and a control power transformer (TR ').

By the way, in the booth clip (Bus Clip, 5) of the high-pressure circuit breaker 3 used in the blast furnace process, when the electric conductor is energized, heat generation occurs due to the Joule heat effect. That is, when the conductors are in contact with each other, the actual contact area becomes much smaller than the apparent contact area due to the roughness of the contact surface, and the film that obstructs the flow of current due to oxidation, corrosion, foreign matter, etc. As a result, considerable electrical resistance is generated at the contact surface, and thus, a large potential difference is generated at the contact portion and a lot of heat is generated due to the influence of such contact resistance.

The blast furnace process is a continuous production process. The production stop due to the above-mentioned heat generation and the breaker accident such as the explosion accident causes huge economic loss, and the unsafe power supply is the main cause of not only production but also safety accident. Becomes

The problems of the power system of the blast furnace plant are as follows.

First, since the inspection of the high-voltage board in the live state, the worker's anxiety and electric shock disaster due to the heavy load current and high voltage is expected. According to the conventional inspection means, the high pressure panel door is opened and an operator artificially measures the five senses and a temperature detector.

Secondly, in the blast furnace region, a large amount of blast furnace gas (BFG) is generated and introduced into the electrical chamber, so that the corrosion of the high-pressure panel booth clip is easily generated, and a large amount of water vapor acts as a catalyst during such corrosion. Particularly, in the breaker with heavy load fluctuation, the breaker clip part is deteriorated according to the temperature change, and when the spring holding the clip part deteriorates, the elastic force is weakened and the tension is decreased. Therefore, the contact resistance occurs and the temperature rises. (CLIP) Part explosion may occur.

An example of a breaker accident is as follows. Due to deterioration of the primary part of the clip part of the main high voltage circuit breaker (VCB) and the vacuum switch (VCS) (which cannot be checked during power supply), the breaker clip part explosion and power failure occurred frequently. In the ACB clip part, deterioration occurred at the primary side, which was not visually inspected, and therefore, a blast furnace breaker accident occurred frequently. Therefore, efforts to minimize breaker accidents due to corrosion deterioration are urgently required.

As a conventional technical means for solving the above problems, the visual inspection performed by the operator after taking out the high pressure circuit breaker during periodic equipment shutdown and regular repair work was the best, but the primary side of the high pressure circuit breaker was difficult to check even with the naked eye, and the blackout work was performed. The operator was reluctant to work because all the control systems were switched off.

Third, since the circuit breaker is injected from the front of the panel, a problem that the circuit breaker explodes when the circuit breaker is introduced has arisen, and a related safety accident has occurred.

Fourth, measuring the abnormality of the breaker clip on the secondary side of the breaker can be done by visual inspection by opening the door at the back of the panel.However, to check the abnormality or the temperature of the primary side booth clip of the high-voltage breaker, use a steel plate inside the panel. Because it is partitioned and clogged, it is not easy to know whether the booth clip is abnormal at the primary side, and when the breaker is abnormal, the breaker is exploded because it is not visually inspected at all, which causes a risk of safety accidents and abnormal power system. There was a problem that the plant equipment is stopped due to.

The present invention has been made to solve the above problems, in order to prevent failure of the high voltage accommodating chamber breaker in a bad environment, by installing an automatic temperature detector and a current detection system, whether the heat generated by the abnormal temperature rise in the cab It is an object of the present invention to provide a high-voltage breaker booth clip abnormal temperature automatic detection device that can remotely monitor, and by blocking the breaker remotely when detecting an abnormality, to prevent secondary accidents to improve the reliability of the power system.

Figure 1a is a schematic diagram showing the configuration of a general high pressure panel of the blast furnace installation,

1b is a power system diagram of a typical high pressure panel of the blast furnace installation,

2 is a three-dimensional configuration diagram of a high pressure panel internal circuit breaker of the blast furnace installation,

3 is a cross-sectional view of the temperature detection unit of the automatic abnormal temperature detection apparatus according to the present invention;

4A is a cross-sectional configuration diagram showing a state in which the automatic abnormal temperature detection device according to the present invention is installed;

Figure 4b is a perspective view showing a state in which the automatic abnormal temperature detection apparatus according to the present invention is installed,

5 is a block diagram illustrating a process of transmitting a temperature and current detection signal of an automatic abnormal temperature detection apparatus according to the present invention;

6 is an operation flowchart of the automatic abnormal temperature detection apparatus according to the present invention.

<Description of Symbols for Major Parts of Drawings>

1: high pressure panel 3: high pressure circuit breaker

3a: vacuum breaker 4: high pressure booth

5: Booth clip (primary side) 6: Panel door key handle

7: temperature detection unit 7a: bearing

7b: lighting 7c: infrared thermometer

7d: Camera 9: Insulation Insulator

11: drive motor 12: encoder

13: guide 14: drive chain

16: MMI (Process Control Computer) 17: PLC

20: control panel 23: alarm unit

26: CRT27: CT

The present invention for achieving the above object, as a device for detecting the abnormality of the primary side booth clip (5) of the high pressure circuit breaker (3) installed in connection with the high pressure panel (1), the high-pressure circuit breaker (3) primary side booth It is installed on the upper part of the clip (5), provided with an infrared thermometer (7c) to measure the temperature of the booth clip (5), and equipped with a lamp (7b) and a camera (7d) the booth clip (5) at the temperature measurement A temperature detector (7) for photographing; The temperature detection unit 7 receives the temperature measurement value and the image signal, and draws the current value from the CT 27 of the high-voltage panel 1, converts these signal values into a PLC current signal, PLC (17) Control panel 20 to transmit to; The received values are transmitted to the MMI 16, and when the temperature measurement value or the current value of the high-voltage panel 1 reaches the alarm value set in the MMI 16, an alarm is generated through the alarm unit 23. A PLC 17 for tripping the high voltage circuit breaker 3 by outputting a trip signal to the control panel 20 when the trip value is reached; The alarm value and trip value for the temperature measured value and the current value are set and transmitted to the PLC 17, and the information about the temperature measured value, the image signal, and the current value is transmitted through the connected CRT 26. It characterized in that it comprises an output MMI (16).

In addition, the present invention, the temperature detector 7 is moved by the drive of the transport chain along the guide rail 13 formed on the upper portion of the high-voltage circuit breaker (3) primary side booth clip (5), the guide On one side of the rail 13 is installed a sprocket which is rotationally driven by the drive motor 11, the other side is provided with another sprocket for supporting the temperature detecting unit 7 transfer chain, connected to one side of the sprocket Abnormality of the primary side booth clip 5 of the plurality of high voltage circuit breakers 3 by calculating the moving distance of the temperature detector 7 by the installed encoder 12 so that the position control can be performed by the PLC 17. It is characterized by being able to detect the presence or absence automatically.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

3 is a cross-sectional configuration diagram of a temperature detector of the automatic abnormal temperature detection apparatus according to the present invention, FIG. 4A is a cross-sectional configuration diagram showing a state in which the automatic abnormal temperature detection apparatus is installed according to the present invention, and FIG. 4B is an abnormal temperature according to the present invention. 5 is a block diagram illustrating a process of transmitting a temperature and current detection signal of the automatic abnormal temperature detection apparatus according to the present invention, and FIG. 6 is an operation flowchart of the automatic abnormal temperature detection apparatus according to the present invention. to be.

The present invention is to prevent the high-voltage circuit breaker accident (failure) caused by corrosion, deterioration, etc. due to the poor environment of the blast furnace plant, the infrared temperature detection unit (7) in the high-voltage circuit breaker with a large load fluctuation (B) It is installed on the upper part of the clip (5), and installs a lamp (7b) and a camera (7d) for preventing the internal darkness of the panel when measuring the temperature, and transmits the measurement signal to the MMI (MAN) through the control panel 20 and PLC 17 MACHINE INTERFACE, 16), so that the driver can monitor the booth clip (5) while watching the screen at the same time temperature measurement.

The temperature detector 7 is provided with a bearing 7a so as to move on the guide rail 13 to sequentially and regularly detect whether or not the temperature of the booth clip 5 with respect to the plurality of high pressure circuit breakers 3 is abnormal. One side of the guide rail 13 is provided with a driving motor 11 for rotating the sprocket, and on the other side of the sprocket while supporting the chain for transferring the temperature detector 7 by another sprocket. The encoder 12 connected to one side allows position control by the moving distance of the temperature detector 7 so that the temperature of each breaker booth clip 5 can be detected automatically.

The temperature detection unit 7 is configured to be fixed to one point of the chain to receive a moving force by the rotation of the chain. As the moving means, sprockets and chains may be used as described above, but means such as wheels and belt types. Of course it can be used.

One side of the temperature detector 7 is formed with a signal transmission clip for transmitting a detection signal to the control panel 20 so as to contact the exposed wire formed in the longitudinal direction inside the guide rail 13 to transmit the detection signal. It can be configured to transmit a signal by connecting a general wire.

Meanwhile, in the present invention, the load current is detected by the CT 27 of the high voltage circuit breaker 3 and the high pressure panel 1, and the detected value is converted into an appropriate signal value through the converter of the control panel 20 to the PLC 17. It was possible to transfer.

The control panel 20 is configured to display a temperature value and to display an alarm value, and the detected temperature and current signals are transmitted to a calculation unit of the PLC 17 to compare and determine temperature and current, and thus, in the MMI 16. When it is determined that the set alarm value and the trip value is approached, the signal is output to the remote control circuit breaker power supply unit in the control panel 20 to trip the high voltage circuit breaker 3, and generate an alarm through the alarm unit 23. It became.

On the other hand, the MMI (16) is configured to have a continuous graphics display (TREND DISPLAYS) function that can accumulate and manage the measured data.

Hereinafter, the operation of the present invention will be described.

When operating the automatic detection device of the high-voltage breaker booth clip abnormal temperature according to the present invention, first determine whether there is an abnormal supply of the control power supply of the device, and detect the booth clip 5 temperature and current in the normal state to detect an alarm value and a trip value. Will be set.

As described above, an infrared temperature detector 7 is provided on the guide rail 13 provided above the primary side bus clip 5 of the high-voltage circuit breaker 3 for loads with large load fluctuations. When the temperature is detected, the basic principle of the infrared temperature detection unit 7 will be described.

Non-contact infrared thermometers (also known as radiation thermometers, radiometers, and pyrometers) produce black bodies at the same temperature because all materials do not radiate more heat than black bodies at the same temperature and in the same infrared wavelength range. By measuring the temperature, calibration is performed, and the temperature of the object to be measured is measured in an infrared manner.

The temperature detector 7 measures the temperature of each booth clip 5 of the high pressure circuit breaker 3 along the guide rail 13. When the temperature measurement system is first operated, the drive motor is controlled by the PLC 17. 11) is operated and the temperature of the booth clip 5 of the initial position is measured by the PLC 17.

At the time of temperature measurement, when the temperature detector 7 arrives at the position of the booth clip 5, the position value is calculated by the PLC 17 by the distance value calculated by the encoder 12, and the driving motor 11 is stopped. After that, the lamp 7b is turned on and the camera 7d is operated, and the video signal photographing the state of the booth clip 5 together with the measured temperature of the infrared thermometer 7c is transmitted to the MMI 16 via the PLC 17. Is sent.

After that, when the drive motor 11 is driven again by the command of the PLC 17, and the temperature detector 7 arrives at the next booth clip 5, the booth clip 5 is operated in the same manner as described above. ) And finally transmit the signal to the MMI (16).

When it is determined that the measurement of all the booth clips 5 has been completed, the PLC 17 issues a command to reversely drive the driving motor 11 that drives the temperature detector 7. You will be moved to the waiting parking position.

On the other hand, the video screen of each booth clip 5 taken by the camera 7d is transmitted at the same time as the temperature measurement, the driver can know at a glance on the screen of the cab CRT 26 through the converter of the control panel 20 This allows the driver to easily monitor the abnormal state of each breaker booth clip 5 of the high pressure panel 1 in the cab.

On the other hand, the present invention is provided with a current detection system for detecting the load current of the circuit breaker, the current signal drawn from the panel CT 27 of each high-voltage circuit breaker 3 is transmitted to the current detection converter of the control panel 20, the temperature When measuring the detection unit 7 the current signal is converted to a signal value of 4 ~ 20mmA through the converter and transmitted to the PLC 17, when the temperature value and the current value is larger than the value set in the PLC 17, the alarm unit 23 Is configured to generate an alarm.

In this case, the driver sees the alarm, grasps the state, and trips the high pressure circuit breaker 3 remotely in an emergency. The alarm value is configured to be set at the temperature value display part in the control panel 20, so that the manual setting may be made and confirmed in the field. Will be.

The temperature and current signals detected as described above are transmitted to the PLC 17 calculation unit, and when it is determined that the alarm value and the trip value set by the MMI 16 are approached, they are outputted to the remote control circuit breaker power supply unit in the control panel 20 and the high voltage circuit breaker. The trip 3 is tripped and the alarm is output through the alarm unit 23.

The automatic detection device of the high temperature breaker booth clip abnormal temperature of the present invention provides the following effects compared to the conventional inspection method.

First, by automatically measuring the temperature and current of the unmanned electrical room high-pressure plate, to prevent the worker's anxiety and electric shock disaster due to the high load current and high voltage in the live state, and to prevent the safety accident by the breaker explosion when the breaker is inserted.

Second, the operation efficiency is improved by switching from periodic inspections to regular inspections, and by establishing a maintenance plan by checking the breaker abnormality at an early stage for maintenance efficiency, and eliminating the need for power failure during inspection.

Third, it is possible not only to automatically measure the abnormality of the breaker, but also to visually check the abnormality of each breaker photographed by the small camera installed in the temperature detector by the monitor in the cab, so that it is easy to generate heat or poor contact corrosion. Can be checked.

Claims (2)

A device for detecting the abnormality of the primary side booth clip (5) of the high pressure circuit breaker (3) installed in connection with the high pressure panel (1), The high pressure circuit breaker 3 is installed above the primary side booth clip 5, and has an infrared thermometer 7c to measure the temperature of the booth clip 5, and is provided with a lamp 7b and a camera 7d to measure temperature. A temperature detector 7 for photographing the booth clip 5 of the city; The temperature detection unit 7 receives the temperature measurement value and the image signal, and draws the current value from the CT 27 of the high-voltage panel 1, converts these signal values into a PLC current signal, PLC (17) Control panel 20 to transmit to, The received values are transmitted to the MMI 16, and when the temperature measurement value or the current value of the high-voltage panel 1 reaches the alarm value set in the MMI 16, an alarm is generated through the alarm unit 23. A PLC 17 for tripping the high voltage circuit breaker 3 by outputting a trip signal to the control panel 20 when the trip value is reached; The alarm value and trip value for the temperature measured value and the current value are set and transmitted to the PLC 17, and the information about the temperature measured value, the image signal, and the current value is transmitted through the connected CRT 26. High-voltage breaker booth clip abnormal temperature automatic detection device, characterized in that it comprises an output MMI (16). The method of claim 1, The temperature detection unit 7 is moved by the drive of the transport chain along the guide rail 13 formed on the upper portion of the high-voltage circuit breaker 3, the primary side booth clip 5, One side of the guide rail 13 is provided with a sprocket which is rotationally driven by the drive motor 11, the other side is provided with another sprocket for supporting the temperature detecting unit 7 transfer chain, one side of the sprocket The primary side busbar clip 5 of the plurality of high voltage circuit breakers 3 by calculating the moving distance of the temperature detector 7 by the encoder 12 connected to the controller 17 so that the position can be controlled by the PLC 17. Automatic detection device for abnormal temperature of the high-voltage breaker booth clip, characterized in that the automatic detection of abnormalities.