KR200298577Y1 - remote managing system of electric railway - Google Patents

Abstract

The present invention is designed to keep electric trains supplying electricity directly to electric railways, feeders supplying electric power to electric trains, concave lines that are tightened to keep the electric tanks at the same level, and photocurrents continuously installed at regular intervals on ground lines and railway rails. Sensor, Bushing type PT to measure voltage and use as operating power, Position sensor attached to grasp the weight position in tension adjusting device, and Tilt sensor to measure the inclination of pole in pole. An input device consisting of; Compute / measurement / calculations / optical converters as input / output converters of the photocurrent sensor of the input device, the inclination from the tilt sensor and the position sensor of the input device, the position data, and the current and voltage data from the optical converter and the bushing type PT. A communication unit for analyzing the catenary line analysis unit, an operating power unit for use as an operating power source through the bushing type PT of the input device, a display unit for displaying measurement / analysis values of the catenary line analysis device, and data of the catenary line analysis device A catenary management panel device comprising a communication unit for converting the information into an optical communication modem and an optical communication modem for transmitting the communication conversion value of the communication unit; It provides a tramline remote management system, characterized in that consisting of.

Description

Remote management system of electric railway

The present invention relates to a catenary remote management system, and more particularly, to measure an input device equipped with an optical current sensor and an optical voltage sensor on rails, catenary and feeder lines of an electric railway, and to measure data values measured by the sensors of the input device. The present invention relates to a catenary remote management system composed of a catenary management panel device for analysis.

In general, electric railways are environmentally friendly, use energy efficiently, and are capable of driving at high speeds, and are rapidly expanding to be the best alternatives to solve traffic problems.

Such an electric railway is classified into a DC feeding method and an AC feeding method according to its feeding method, and the AC feeding method may be classified into a BT feeding method and an AT feeding method.

The DC feed system consists of a rail for driving a train and a ground return to the negative (-) bus bar of the substation through a lead-in wire connected to the neutral point of the impedance bond. In this DC power supply method, it is necessary to compare the supply current of the feeder line and the return current returning along the rail to analyze the state of the leakage current and confirm the disconnection state.

On the other hand, the BT feeder (Booster Transformer) is a suction transformer (BT) that consists of a circuit that forcibly draws the return current from the rail (impedance bond) through the suction line and returns to the substation through the subfeed line. In this BT feed method, it is necessary to check the leakage current state, power current analysis and disconnection state by comparing the supply current of the feeder line and the return current returning along the rail. In single-phase AC trains, induced obstacles occur in communication lines caused by high frequency waves generated during rectification of electric vehicles. In addition, when the return current, ie, the return, is a part of the load current leaks to the ground, a noise voltage and a dangerous voltage are generated on the communication line. In this way, the feeding method that installs a transformer with a winding ratio of 1: 1 between the cable line and the sub feed line to forcibly draw the rail current to flow to the processed sub feed line in order to make the earth current flow as little as possible. I use it. In this kind of feeding method, the induced voltage induced in the communication line can be reduced to 1/10-1/30 by electromagnetic induction, and the rail current can't be completely zero due to BT's self saturation phenomenon. Usually, the installed interval of BT is 4KM in existing industries.

In addition, the AT power supply system (Auto Transformer) consists of a circuit that forcibly flows the return current to the single winding transformer by connecting the neutral point of the transformer winding and the rail (impedance bond) to the neutral winding at the installation site of the single winding transformer. It is necessary to check the leakage current status, power current analysis and disconnection status by comparing the return current returning along the rail. One of the big problems in the electric railway of the high speed and high current load section is the voltage drop of the tram line, and the allowable voltage regulation of the tram line is + 10% of the maximum standard voltage and -20% of the lowest standard voltage. Therefore, in case there is a voltage drop below the minimum voltage value, the substation interval should be narrowed or the train driving dia should be technically considered. The AT feeding method is a power feeding method that solves these problems and considers construction cost reduction. A mono winding transformer is a transformer in which one continuous winding is wound on the same iron core and a part of which is commonly connected to the primary and secondary circuits. As there is no Booster Section, which is a disadvantage of BT feeding method, it is easy to collect high speed, and the feeding voltage is twice as much as before, so the voltage drop is small and the substation spacing is far away. In other words, if the BT substation interval is 30-40 KM, the AT substation interval is expanded to about 100 KM. Usually, in the substation, the feeder is installed along the line like the BT subfeeder, and AT is connected between the feeder and the tramline in parallel at intervals of about 10 km, and the neutral wire N of the transformer winding is connected to the rail. The transformer, which is common to the primary and secondary circuits with a series of windings, takes the neutral point at the midpoint of the number of turns. When the load is applied, if the current distribution is two or more ATs, the orbital current is classified before and after the load, and the electromagnetic induction is canceled.

And as can be seen in Figure 1, the electric railway line of the electric railway is composed of a wire facility such as a tram line to directly supply electric power to the electric railway, and a chariot device and supporting structure for the electrical or mechanical division or protection adjustment. . The main purpose of the tram line is to supply electric power of good quality to the electric railway and to have a current collecting capability for supplying electric power to the electric vehicle current collector.

In FIG. 1, the tramline 10 is a means for supplying electricity which is indispensable for the electric vehicle to travel along the track, and the feeder line 20 is a wire for supplying electricity to the tramline from the substation. In addition, it is composed of a ground wire 30, a clam wire 40, a long pole insulator 50, a long pole 60, and the like.

However, the tramway of the electric railway has many obstacles because it supplies a large load required for train operation in a poor way during the movement. In addition, there is a circulating current that is current flowing through electric wires, wire brackets, etc. other than the main circuit (train line) between the electric current transmitted from the substation and the electric vehicle through the feeder line and the feed point branching device. There are incomplete connection parts such as drop bar, curve pull, and contact at the intersection of electric wires of vibration prevention device. For this reason, an accident caused by a circulating current such as softening of metal occurs due to the temperature rise accompanied by melting of the metal or increase of contact resistance due to arc heat. Therefore, it is necessary to measure and manage the degree of arc generation in the front line. However, the current management method that relies on circular inspection by manpower has limitations in terms of accident prevention and management, and has many problems.

The present invention was devised to solve the above problems, and through scientific maintenance diagnosis technique by combining information technology and computer technology, which are advanced in the center of manpower, for the maintenance and repair system of the tram line used in electric railway 24 By establishing a remote management system of the tram line that comprehensively monitors and manages the tram line remotely over time, it aims to improve the performance, reliability and security of higher tram lines to secure the safe operation of the train and further increase the efficiency of railway management. Has its purpose.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram schematically showing a wire facility such as a tramway of an electric railway.

Figure 2 is a view showing the arrangement of the input device and the tram line management panel in the tram line remote management system according to the present invention.

3 is a schematic diagram of a catenary management panel according to the present invention.

4 is a detailed view of an input device and a catenary management panel device in a catenary remote management system according to the present invention;

5 is a block diagram of a catenary remote management system according to the present invention.

6 (a), (b) is a front view and a side view of the optical sensor according to the present invention.

Figure 7 (a), (b) is a front view and a side view of the assembled state of the optical sensor for the tram line according to the present invention.

Figure 8 (a), (b) is a front view and a side view of the assembled state of the optical sensor for the rough wire, the retrace, feed line according to the present invention.

9 is a view showing an attached state of the optical sensor for a rail according to the present invention.

10 is a view showing a bushing type PT of the input device according to the present invention.

* Brief description of the major reference numerals

1: catenary 2: feeder

3: ground wire 4: barbed wire

7: rail 8: photocurrent sensor

9: Bushing type PT 10: Tilt sensor

11: position sensor 19: catenary panel device

The present invention, in order to achieve the above object, a tram line for directly supplying electric power to the electric railway and a feeder for supplying power to the tramline, a concave line for tightening to keep the tramline at the same height, and a ground line, a rail to the railroad Photocurrent sensors mounted continuously at intervals, bushing type PT for measuring voltage and using them as operating power, position sensors attached to determine the weight position of tension adjusting device, An input device comprising a tilt sensor for measuring a tilt; Compute / measurement / calculations / optical converters as input / output converters of the photocurrent sensor of the input device, the inclination from the tilt sensor and the position sensor of the input device, the position data, and the current and voltage data from the optical converter and the bushing type PT. A communication unit for analyzing the catenary line analysis unit, an operating power unit for use as an operating power source through the bushing type PT of the input device, a display unit for displaying measurement / analysis values of the catenary line analysis device, and data of the catenary line analysis device A catenary management panel device comprising a communication unit for converting the information into an optical communication modem and an optical communication modem for transmitting the communication conversion value of the communication unit; Characterized in that it provides a tramline remote management system consisting of.

The present invention preferably further comprises an image monitoring unit for monitoring the tram line and the structure to the input device to transmit the image to the tram line analysis unit of the tram line management panel device.

In addition, in the present invention, the photocurrent sensor mounted on the catenary of the input device is attached in a non-contact manner, and uses a sensor having a broadband measurement range from a small current to a large current using a Faraday effect without being subjected to electromagnetic induction interference. The sensor includes a sensor main body above the tramline, an optical connector on the upper part of the main body and a mounting base extending along the tramline to the left and right sides of the sensor main body, and a central recess formed along the tramline along the upper outer periphery of the tramline. It is characterized in that it provides a catenary remote management system consisting of a semi-circular clip portion having a hook portion for locking and fastening.

In addition, in the present invention, a photocurrent sensor mounted on a feed line, a coarse line, and a return line of the input device may be attached in a non-contact manner, and may have a sensor having a broadband measurement range from a small current to a large current using a Faraday effect without receiving electromagnetic induction interference. The sensor is connected to the sensor body and the optical connector on the upper part of the sensor body and mounting brackets extending to the left and right sides of the sensor body, and fastening and fixing the sensor along the entire outer circumference of the feed line, the jaw line, and the gas line. Characterized in that it provides a catenary remote management system consisting of a circular clip.

In addition, the position sensor in the present invention is preferably using an ultrasonic sensor.

In addition, in the present invention, the photocurrent sensor mounted on the rail is preferably mounted on both sides of the pair of rails with a sensor body equipped with an optical connector and a housing surrounding the outside.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

In general, "train lines" in electric railways are means of supplying electricity which is indispensable for electric vehicles to run along tracks. In particular, the tramway serves as a medium for supplying high voltage and current from electric substations to the electric vehicle by using the pantograph of the electric vehicle, and is always exposed to the outside atmosphere, and the accident rate is high due to the high current and voltage fluctuation rate due to the operation of the electric vehicle. There is always a possibility, and it is a field that must be handled with care not only in new construction but also in renovation because it causes a great disaster in case of an accident.

In view of the characteristics of this tramway, since the electric vehicle travels while handling the notch, the load point and the magnitude of the load always change, and the load distribution is complicated. In the single-wire system, an electrical circuit of one-ground ground using a track as a return line is formed. Electric power feeding is performed by sliding by contact between a current collector and a catenary. Therefore, the height, declination, and grade of the tramline should always be kept within the prescribed values with respect to the track. The installation place is on the track and is damaged by soot. The construction of tunnels, bridges, over bridges, branching points, etc. is limited to the hypothesis. The use of subordinates is a power source for transporting valuable lives and property, which requires strong publicity and safety. Therefore, the necessary conditions are to maintain the current collection performance suitable for the operating conditions such as current collection current, operating speed, running interval and combination of the electric vehicle, maintain sufficient mechanical strength in response to the expected external force such as wind pressure, snow, ice, rain Sufficient electrical strength should be maintained in response to changes in current capacity and voltage drop due to fouling, soot, salt, etc., economical maintenance is possible, and failures caused by accidents do not spread to other sections. Separation of feeding section should minimize the disturbance of train operation and facilitate power failure at work. Do not adversely affect people and general devices caused by electromagnetic waves.

In addition, a feeder is an electric wire which supplies electric power to a tank line from a substation. In the DC system, if there is no feeder line, the electric resistance between electric car and substation is large and the electric current is overheated due to lack of capacity due to large current, which may cause disconnection accident and severe electric voltage drop may affect the operation of electric vehicle. In the AC section, in the BT mode, the voltage is high and the current is small. Therefore, it is partly installed as the contact point of the substation and the dead section of the substation. In the AT method, the feeder is installed in parallel with the feeder line as required by the feeder method.

Such a feeder should be processed in principle. In case of unavoidable, the feeder can be installed in a dedicated column or if it is impossible to process it, it can be installed in concrete wall, ceiling, or underground cable. The hypothesis of the feeder line (2) is hypothesized in the support for each of the upper and lower lines, and when more than two systems are used together, it is considered that the pressurization part of the feeder line in which the feeder line of the tank line is different is separated by more than 1,200mm and the tension between the span and the wire is different. It should be hypothesized so as not to mix.

And, in principle, the connection of feeder should be done by linear compression connection and use various sleeves suitable for the thickness and purpose of wire. In addition, the connection of heterogeneous metals, such as aluminum wires and hard copper wires, may cause corrosion of the connection points by some kind of phenomena. Therefore, in order to prevent this phenomenon, a special sleeve in which the ionization tendency is placed in the sleeve is equivalent to the neutrality of both metals. Use In principle, the feeder's connecting position is at least 2M away from the supporting point.

In addition, the feed branch line is a wire connecting the feed line and the tram line in order to supply electricity to the tram line, and in the case of the BT type, the installation position is installed in the substation drawer, BT section, dead section and the feed section contact point, AT method: Install at the substation drawer or AT installation place. The connection method should be installed so that the function of the automatic tensioning device is not impaired and the connector and the cable line are equalized.

In addition, a jogging ship means the electric wire which a ship uses a dropper, a hanger, etc. in order to keep a tank line horizontally at the same height. In general, a rough wire is required to have a high mechanical strength, a high corrosion resistance, a high wear resistance, good electrical conductivity, and an appropriate coefficient of linear expansion.

In addition, poles as supporters are installed in combination with beams, brackets, etc. in order to support or humanize wires. In principle, concrete poles can be used. However, only temporary temporary construction of accident recovery, construction, etc. may be used. Wood is used for temporary construction during accident recovery and construction, and concrete is used instead of iron if inevitable. P.C concrete is used for tram lines and is a non-tapered pole (reinforcing pole without pole-the same diameter of upper and lower poles). Usually, the poles of the tramline use iron poles. H-beams, unions and steel pipes are used for the column, and narrow channel can be used where there is a small margin of construction. If high voltage is applied due to leakage current in insulator or insulator flash, type 3 grounding work is performed to prevent the risk of shrinkage due to incomplete grounding. In order to prevent corrosion, the iron column should be galvanized in principle.

2 shows a sensor attached to such a tram line, a feeder line, a ground line, a concave line, a railroad rail, and the like.

As shown in FIG. 2, the catenary wire 1 for directly supplying electric power to the electric railway of the present invention, the feeder line 2 for supplying electric power to the catenary line, and the grounding line 3, the jaw wire 4, and the railroad rail 7 ) Is equipped with one or more photocurrent sensors 8 at regular intervals. In addition, a bushing type PT (9, Bushing type PT) for measuring the voltage and using it as an operating power source of the tank line management panel device 12 described later is provided. Reference numerals 5 and 13 denote bushing potentiometers. In addition, the position sensor 11 of the present invention is attached to the tension adjusting device for grasping the weight position, and the method and the position chip by the proximity software combination as a device for preventing accidents beyond the additional limit point as the tram line is stretched. There is a Sly Dachs way. In addition, the inclination sensor 10 for measuring the inclination of the pole 6 to prevent the pole pole inclination accident is mounted on the pole 6. The photocurrent sensor, bushing type PT, position sensor, tilt sensor, etc. all form an element of the input device. The apparatus may further include an image monitoring unit configured to monitor the tramline and the structure in the input device and transmit the image to the tramline analyzer of the tramline management panel device as an image, and may include a temperature sensor for measuring temperature. In addition, the position sensor 11 may use any one of an ultrasonic sensor, an infrared sensor, and a laser sensor. In the present invention, the photocurrent sensor may be attached in a non-contact manner, and it is preferable to use a sensor having a wide measuring range from a small current to a large current using a Faraday effect without receiving electromagnetic induction interference.

Table 1 summarizes the monitoring items measured by the sensors of such an input device.

Supervised Surveillance item Monitoring purpose Required device Tramline Monitoring of the line voltage status by current collection status analysis section of fault and undervoltage pantograph Disconnection by feed voltage (over / under voltage) section, ground monitoring contact line pantograph wear condition PT Digital Voltage Analysis Device Communication Unit Overload due to acceleration and deceleration of train line current distribution monitoring train by section Overload condition and ground analysis CT Digital Current Analysis Device Communication Unit Analysis of tidal current power supply efficiency Phase of electric power supplied between feeder stations Measurement of each tramline load (Instantaneous maximum current, 1 hour maximum power, average power, load rate, burden rate) Section Power Monitoring (current time curve, power time curve, power amount time curve analysis) PT / CT Digital Voltage / Current Analysis Device Communication Unit Ground wire Insulation State of Leakage Current Field Insulator Short circuit accident prevention insulator CT Digital Leakage Current Analysis Device Communication Unit rail Feedback current analysis with train lines Circulation circuit check (disconnected) Leakage current check CT Digital Leakage Current Analysis Device Communication Unit

3 is a schematic diagram of a catenary management panel according to the present invention, and FIG. 4 is a detailed view of an input device and a catenary management panel device in the catenary remote management system according to the present invention.

The catenary management panel device according to the present invention includes a digital catenary analysis unit 12, an optical converter 13, a communication unit 14, an optical communication modem 15, an operation power supply device 16, a terminal block 17, and a base 18. )

The digital catenary analysis unit 12 calculates / measures / analyzes the inclination and position data coming from the tilt sensor and the position sensor of the input device, and the current and voltage data coming from the optical converter and the bushing type PT.

The optical converter 13 is an input output converter of the photocurrent sensor of the input device.

In addition, an operating power supply unit 16 for use as an operating power source through a bushing type PT of the input device, a communication unit 14 for converting data of the catenary analysis unit 12 into communication, and the communication unit ( An optical communication modem 15 or the like for transmitting the communication conversion value of 14) is mounted. In addition, preferably, the display unit for displaying the measurement / analysis value of the catenary analysis unit may be provided.

4 illustrates an input device and a catenary management panel gel apparatus in a catenary remote management system according to the present invention. As described above, input devices can be classified into current, voltage, slope, location, temperature, CCTV, optical cord, and mounting brackets.The lane management panel device is an optical converter, digital catenary analysis unit, display unit, communication unit, optical communication. It can be divided into modem and operation power supply.

Figure 5 shows a block diagram of a catenary remote management system according to the present invention. As shown, various sensors of the input device develops and applies the sensor most suitable for the environment of the tramline, and the tramline management panel receives the signal from the input sensor and converts it into necessary data from the remote control monitoring panel of the tramline and transmits it to the communication. In addition, it transmits the communication data of the tramline management panel to the tramline remote monitoring and monitoring panel by using wired, optical communication, and satellite communication. In addition, the front line of the remote control monitoring station expresses the data received through communication as useful information and database. This includes monitoring, alarming, data collection, measuring equipment management, preventive inspection management, work management, equipment history management, trend analysis, and material management.

Hereinafter, a form and a mounting method of mounting the photocurrent sensor on each part of the catenary in the input device according to the present invention will be described in detail.

6 (a) and 6 (b) are front and side views of the photocurrent sensor according to the present invention, and FIGS. 7 (a) and 7 (b) are front and side views of a state in which the photocurrent sensor according to the present invention is mounted on an electric vehicle line. 8 (a) and 8 (b) show a front view and a side view of a state in which the photocurrent sensor according to the present invention is mounted and assembled to a rough line, a retrace line, and a feed line. 9 shows a state in which the photocurrent sensor according to the present invention is mounted on a rail.

The photocurrent sensor 20 mounted on the catenary according to the present invention extends along the catenary to the left and right sides of the sensor body 21 and the sensor connector 21 and the sensor body 21 above the catenary. The mounting base 23 and the clip portion 24 for fastening and fixing the sensor to the chariot line along the upper outer periphery of the chariot line. That is, in the present invention, the photocurrent sensor mounted on the catenary of the input device is attached in a non-contact manner, and uses a sensor having a broadband measurement range from small current to large current using the Faraday effect without being subjected to electromagnetic induction interference. It is preferred that the sensor body 21, the optical connector 22, the mounting table 23, the clip portion 24. Here, the clip 24 may be fastened and fastened by locking the sensor along the upper outer circumference of the tank line to a central recess formed along the tank line.

In addition, the photocurrent sensor mounted on the feed line, the jaw wire, the return line according to the present invention is left and right of the sensor body 21 'and the optical connector 22 on the sensor body 21' and the sensor body 21 'above the tramline. Mounting base 23 extending along the tram line to both sides, and the clip portion 24 'for fastening and fixing the sensor along the entire outer periphery of the feed line, the jaw line, the retrace.

In the present invention, the photocurrent sensor mounted on the tramline and the photocurrent sensor mounted on the feeder line, the barbed wire, the retrace line, and the like, have different clip portions 24 and 24 '. Clip portion 24 to be mounted on the tramline is to fasten and fix the tramline along the outer periphery of the upper end of the tramline. That is, it has a semi-circular shape, and it is preferable that the hook parts are provided at both sides so as to be locked to the recesses of the catenary. This is because the pantograph passes under the tank line. However, the photocurrent sensor mounted on the feeder, the feeder, the return line, etc. has a circular clip portion 24 ′ formed such that the sensor is fastened and fixed along the entire outer circumference of the feeder, the feeder, the return line.

In addition, the photocurrent sensor mounted on the rail 7 shown in FIG. 9 mounts the sensor main body 21 on which the optical connector 22 is mounted on both sides of the pair of rails, and attaches the housing 25 surrounding the outside. It is good.

10 shows a bushing type PT of the input device according to the present invention. The bushing type PT according to the present invention can be used as an operating power source for the catenary panel apparatus and can also send the measured voltage to the catenary seat analyzing unit.

According to the present invention, a maintenance system of the tram line used for the electric railway is constructed through a scientific maintenance diagnosis technique, and a remote management system of the tram line is integrated to monitor and manage the tram line remotely for 24 hours. It can improve the performance, reliability, and security of the system, and receive and utilize the data of the train line and other devices to prevent accidents in advance, and to remotely diagnose and monitor the replacement cycle of various parts through maintenance. In conjunction with management programs that minimize costs, a more secure and more efficient lane management system can be achieved.

Claims (6)

A photocurrent sensor that is continuously installed at regular intervals on a tram line that directly supplies electric power to an electric railway, a feeder that supplies electric power to an electric railway line, and a concave line that is tightened to keep the traverse line horizontally at the same height, and a ground line and a railroad rail at regular intervals; An input consisting of a bushing type PT for measuring voltage and using it as an operating power source, a position sensor attached to grasp the weight position on the tension adjusting device, and a tilt sensor for measuring the tilt of the pole on the pole. An apparatus; Compute / measurement / calculations / optical converters as input / output converters of the photocurrent sensor of the input device, the inclination from the tilt sensor and the position sensor of the input device, the position data, and the current and voltage data from the optical converter and the bushing type PT. A communication unit for analyzing the catenary line analysis unit, an operating power unit for use as an operating power source through the bushing type PT of the input device, a display unit for displaying measurement / analysis values of the catenary line analysis device, and data of the catenary line analysis device A catenary management panel device comprising a communication unit for converting the information into an optical communication modem and an optical communication modem for transmitting the communication conversion value of the communication unit; Catenary remote management system, characterized in that consisting of. The method of claim 1, And a video surveillance unit configured to monitor the tramline and the structure on the input device and transmit the image to the tramline analyzer of the tramline management panel device. The method of claim 1, The photocurrent sensor mounted on the catenary of the input device is attached in a non-contact manner, and uses a sensor having a wide measuring range of small current to large current by using the Faraday effect without being subjected to electromagnetic induction interference. The sensor body and the optical connector on the upper part of the sensor body and the mounting base extending along the tram line to the left and right sides of the sensor main body, and the sensor is fastened by locking the sensor along the upper periphery of the tram line in the central recess formed along the tram line, Catenary remote management system characterized in that consisting of a semi-circular clip portion having a hook portion for fixing. The method of claim 1, The photocurrent sensor mounted on the feeder line, the jaw wire, and the retrace line of the input device is attached in a non-contact manner, and uses a sensor having a wide measuring range from small current to large current using a Faraday effect without being subjected to electromagnetic induction interference. The sensor body of the upper and the optical connector on the upper part of the sensor body and the mounting base extending to the left and right sides of the sensor body, and the circular clip for fastening, fixing the sensor along the entire outer periphery of the feed line, the clam wire, the upper line Catenary remote management system, characterized in that. The method of claim 1, The position sensor is an electric wire line remote management system, characterized in that using any one of the ultrasonic sensor, infrared sensor, laser sensor. The method of claim 1, The photocurrent sensor mounted on the rail is mounted to the sensor body mounted on the optical connector on both sides of the pair of rails, and the front line remote management system, characterized in that for attaching a housing surrounding the outside.