JP7181038B2 - disaster prevention system - Google Patents

Description

The present invention relates to a disaster prevention system.

In a tunnel disaster prevention system composed of a disaster prevention receiver and terminal equipment, terminal devices such as a manual notification device, a fire hydrant activation device, and a duct temperature detector are connected to the disaster prevention receiver via a signal line. As an invention for checking the state of the signal line, there is a tunnel disaster prevention system disclosed in Patent Document 1, for example. This tunnel disaster prevention system sequentially selects one signal line from a plurality of signal lines and connects the selected signal line to an AD conversion port of a control unit. The control unit samples the signal input to the AD conversion port from the connected signal line to measure and record the current flowing through the signal line. The measurement results are displayed on a main monitor device or a sub-monitor device provided in the disaster prevention receiving panel, for example, as in the tunnel disaster prevention system disclosed in Patent Document 2, so that the user can detect deterioration of the signal line insulation, etc. You can find out what the status is.

JP 2017-34489 A JP 2018-45541 A

Signal lines may be affected by external noise such as induced noise, radio noise, and lightning surge. When measuring a signal line affected by external noise, the measurement result may show an abnormal value even if the insulation has not deteriorated, making it impossible to accurately grasp the state of the signal line.

SUMMARY OF THE INVENTION An object of the present invention is to enable determination of the presence or absence of external noise that affects determination of insulation deterioration of a signal line.

(1) A disaster prevention system according to the present invention includes measuring means for sampling and measuring a current value flowing through a signal line, recording means for recording the measurement results of the measuring means, and recording the measurement results recorded in the recording means. and display means for displaying in graph form.

(2) The disaster prevention system according to the present invention, in the configuration described in (1), further comprising detection means for detecting external noise to the signal line based on the measurement results recorded in the recording means. Characterized by

(3) Further, in the configuration of (1) or (2), the disaster prevention system according to the present invention is characterized in that the sampling period is less than 1 second.

According to the above configuration (1), it is possible to determine the presence or absence of external noise that affects the determination of insulation deterioration of the signal line.
According to the configuration (2) above, it is possible to detect external noise that affects the determination of insulation deterioration of the signal line.
According to the above configuration (3), it is possible to determine the presence or absence of external noise that affects the determination of insulation deterioration of the signal line.

The figure explaining the structure of the disaster prevention system 1 which concerns on this invention. 3 is a block diagram showing the configuration of a transmission section 102; FIG. FIG. 4 is a diagram showing details of a measurement circuit 202a, a measurement circuit 202c, and a measurement circuit 202d; The figure which showed an example of the GUI screen which GOT104 displays. The figure which showed an example of the GUI screen which GOT104 displays.

[Embodiment]
(overall structure)
FIG. 1 is a diagram showing an outline of a disaster prevention system 1. As shown in FIG. The disaster prevention system 1 is a system for preventing the spread of fire that occurs in a tunnel. FIG. 1 shows an outline of a disaster prevention system 1 relating to a tunnel having an inbound tunnel 2a and an outbound tunnel 2b on a motorway.

Fire detectors 32 are installed on the wall surfaces of the tunnels 2a and 2b at predetermined intervals along the extending direction of the tunnels. A fire detector 32 monitors the upstream and downstream sides of the tunnel to detect flames from a fire. When flames from a fire are detected by the fire detector 32, a fire signal is generated.

The tunnels 2a and 2b are provided with ducts for ventilation and exhaust along the extending direction of the tunnels, and temperature detectors 31 are installed at predetermined intervals in the ducts. The temperature detector 31 has a switch that functions as contact means, and when the temperature inside the duct rises due to a fire, this switch is turned on and a temperature detection signal flows.

In addition, a fire hydrant device 33 and a manual reporting device 34 are installed at predetermined intervals along the extending direction of the surveillance personnel passage on the walls of the tunnel 2a and the tunnel 2b.

The fire hydrant device 33 is a water discharge facility for initial fire extinguishing, and houses a fire hydrant and a fire extinguisher to which a hose with a nozzle is connected. In the event of a fire, open the fire hydrant door, pull out the hose with the nozzle, and open the fire hydrant valve open/close lever to turn on the fire hydrant start switch for supplying water to the fire hydrant and send the start signal. When the start signal flows, the fire pump that supplies water to the fire hydrant is activated, and fire-fighting water is discharged from the nozzle of the hose.

In addition, the fire hydrant device 33 is provided with a water hydrant used by the fire brigade and a water hydrant activation switch for activating a fire pump for supplying water to the water hydrant. When the hydrant start switch is turned on by the operation of the fire brigade, a start signal flows. When the start signal flows, the fire pump starts and water is supplied to the hydrant. Since the water hydrant is not an essential configuration, the fire hydrant device 33 may be configured without the water hydrant.

Since the fire hydrant activation switch and the water hydrant activation switch are both switches that output activation signals for activating the same fire pump, the fire hydrant activation switch and the water hydrant activation switch may be referred to as activation switches hereinafter. .

The manual notification device 34 is a device for notifying a fire, and when a push button is operated and the switch is turned on, a fire notification signal flows. The push-button manual notification device is also installed in the emergency telephones provided on the walls of the tunnels 2a and 2b.

The manual notification device 34, the fire hydrant device 33 and the temperature detector 31 are examples of terminal equipment according to the present invention.

The disaster prevention receiving panel 10 has a function of detecting an abnormality in the tunnel, reports the occurrence of a fire, and works in conjunction with other equipment to prevent the spread of the fire in the tunnel. The disaster prevention receiving panel 10 is installed in the communication equipment room of the tunnel. The disaster prevention receiver 10 is a P-type system, and includes a signal line 11a connected to the temperature detector 31, a signal line 11b connected to the fire detector 32, and a signal line connected to the manual reporting device 34. 11d, and a signal line 11c connected to the activation switch.

A signal line 11a connected to the temperature detector 31 is provided for each of a plurality of sections divided inside the tunnel, and each of the plurality of signal lines 11a is connected to the temperature detector 31 installed in the corresponding section. It is The signal line 11b connected to the fire detector 32 is provided for each of a plurality of divisions in the tunnel, and each of the plurality of signal lines 11b is connected to the fire detector 32 installed in the corresponding division. It is A signal line 11d connected to the manual notification device 34 is provided for each of a plurality of sections divided in the tunnel, and each of the plurality of signal lines 11d is connected to the manual notification device 34 installed in the corresponding section. It is A signal line 11c connected to the start switch is provided for each of a plurality of sections obtained by dividing the inside of the tunnel, and each of the plurality of signal lines 11c is connected to the start switch installed in the corresponding section.

The disaster prevention system 1 also includes a pump control panel 21 that controls the fire pump and the duct cooling pump that cools the duct.

(Configuration of disaster prevention receiving board 10)
The disaster prevention receiving board 10 includes a control section 101 , a transmission section 102 , a communication section 103 , a GOT 104 , an operation section 105 , an alarm section 106 , a pump control section 107 , a display section 108 and a storage section 109 .

The control unit 101 is a so-called PLC (Programmable Logic Controller), and includes a CPU unit having a CPU and memory, a power supply unit, and an input/output unit having various input ports and output ports including an input port having an AD conversion function. .

The transmission unit 102 is connected to the signal lines 11a, 11b, 11c and 11d. The transmission unit 102 supplies the temperature detection signal, the fire signal, the activation signal, and the fire notification signal to the control unit 101 .

A GOT (Graphic Operation Terminal) 104 is an input/output device having a touch panel. The GOT 104 displays various GUI screens in cooperation with the control unit 101 and receives operations performed on the GUI screens. The GOT 104 displays measurement results of currents flowing through the signal lines 11a, 11c, and 11d, and displays setting screens related to current measurement. The GOT 104 also has a USB terminal and outputs various data to a USB memory connected to the USB terminal.

The communication unit 103 functions as a communication interface for communicating with the remote control equipment 30, which is external high-level equipment, via the communication network 3. FIG. The operation unit 105 has various switches and buttons for operating the disaster prevention receiver panel 10 . The alarm unit 106 has a speaker, a main acoustic device, and an alarm indicator lamp, and issues an alarm when a fire occurs. The pump control unit 107 controls the pump control panel 21 and controls the fire extinguishing pump and the duct cooling pump. The display unit 108 has a liquid crystal display device, and performs alarm display of fire outbreak, abnormality display of current flowing through the signal lines 11a, 11c, and 11d. The storage unit 109 is, for example, a non-volatile memory such as a memory card, and stores the measurement result of the current flowing through the signal line connected to the transmission unit 102 . The storage unit 109 is an example of recording means according to the present invention. Note that the control unit 101 is not limited to a PLC, and may be a microcomputer or a personal computer including a CPU, memory, and input/output unit. Further, in this embodiment, the display unit 108 and the operation unit 105 are arranged on the board surface of the housing of the disaster prevention receiving board 10 to constitute a main display operation unit, and the GOT 104 is arranged inside the door of the housing. The sub-display operation unit is composed of separate components, but they may be integrated.

(Configuration of transmission unit 102)
FIG. 2 is a block diagram showing the configuration of the transmission section 102. As shown in FIG. Each of a plurality of sections 5 dividing the inside of the tunnel includes a temperature detector 31, a fire hydrant device 33, and a manual reporting device 34 arranged in the section 5. FIG. The transmission unit 102 has an input/output unit 200 for each of a plurality of partitions 5 obtained by dividing the inside of the tunnel.

The input/output unit 200 has a signal receiver 201a, a signal receiver 201c, and a signal receiver 201d. The signal receiver 201a is connected to the temperature detector 31 included in the corresponding section 5 via the signal line 11a. The signal receiver 201c is connected to the fire hydrant device 33 included in the corresponding section 5 via the signal line 11c. The signal receiver 201d is connected to the manual notification device 34 included in the corresponding section 5 via a signal line 11d.

The input/output unit 200 also has a measurement circuit 202a, a measurement circuit 202c, and a measurement circuit 202d. The measurement circuit 202a is a circuit for measuring the current flowing through the signal line 11a. The measurement circuit 202c is a circuit for measuring the current flowing through the signal line 11c. The measurement circuit 202d is a circuit for measuring the current flowing through the signal line 11d.

FIG. 3 is a diagram showing details of the measurement circuit 202a, the measurement circuit 202c, and the measurement circuit 202d. Specifically, the signal line 11a, the signal line 11c, and the signal line 11d are composed of a signal line L and a common line C. As shown in FIG. A signal line L is connected to a power supply voltage Vc via a resistor R2 and is pulled up to carry a DC signal, and a common line C is grounded.

A switch SWa and a terminating resistor R1 provided in the temperature detector 31 are connected in parallel to the signal line 11a consisting of the signal line L and the common line C. In a normal state, the switch SWa is turned off as shown. It's becoming

A start switch SWc and a terminating resistor R1 provided in the fire hydrant device 33 are connected in parallel to the signal line 11c composed of the signal line L and the common line C. In a normal state, the start switch SWc is turned off as illustrated. It has become.

A switch SWd and a terminating resistor R1 provided in the manual notification device 34 are connected in parallel to the signal line 11d consisting of the signal line L and the common line C. In a normal state, the switch SWd is turned off as shown. It's becoming

In a normal state in which the switch SWa is turned off, the voltage between the signal line L and the common line C is the power supply voltage Vc, and this voltage is input to the signal receiving section 201a. When one of the switches SWa is turned on due to temperature rise, the voltage between the signal line L and the common line C decreases. The signal receiving unit 201a outputs a temperature detection signal to the control unit 101 when the voltage between the signal line L and the common line C drops below a predetermined voltage.

In a normal state in which the start switch is off, the voltage between the signal line L and the common line C is the power supply voltage Vc, and this voltage is input to the signal receiving section 201c. When any one of the start switches SWc is turned on, the voltage between the signal line L and the common line C drops. The signal receiving unit 201c outputs an activation signal to the control unit 101 when the voltage between the signal line L and the common line C drops below a predetermined voltage.

In a normal state in which the switch SWd is turned off, the voltage between the signal line L and the common line C is the power supply voltage Vc, and this voltage is input to the signal receiving section 201d. When the push button is operated to turn on one of the switches SWd, the voltage between the signal line L and the common line C decreases. The signal receiving section 201d outputs a fire notification signal to the control section 101 when the voltage between the signal line L and the common line C drops below a predetermined voltage.

The measurement circuit 202a, the measurement circuit 202c, and the measurement circuit 202d are circuits for detecting the voltage between the signal line L and the common line C, and have a signal line La connected to the signal line L. Note that the measuring circuit 202a, the measuring circuit 202c, and the measuring circuit 202d are not limited to the illustrated circuits. Any circuit may be used as long as it changes according to an increase in the current flowing through the line L. FIG.

The selection unit 210 includes a relay circuit for each of the plurality of signal lines La connected. In the selection unit 210 , the relay circuit operates according to the control signal from the control unit 101 , and one of the plurality of signal lines La is connected to the AD conversion port of the control unit 101 by the relay circuit.

(Configuration of control unit 101)
In the control unit 101, the CPU executes programs to implement a current measuring unit 1001, a detecting unit 1002, a monitoring unit 1004, and a GUI unit 1005 according to the present invention.

A monitoring unit 1004 controls each unit according to a signal supplied from the transmission unit 102 . For example, when the monitoring unit 1004 receives a fire notification signal by operating the manual notification device 34, the monitoring unit 1004 controls the alarm unit 106 to sound the main sound device, and controls the display unit 108 to display the fire display and the manual notification section display. I do. When the monitoring unit 1004 receives the fire notification signal, the pump control unit 107 controls the pump control panel 21 to start the fire pump.

When the monitoring unit 1004 receives a temperature detection signal due to an increase in the temperature inside the duct, the pump control unit 107 controls the pump control panel 21 to start the cooling pump, and the head installed in the duct is activated. Controls cooling the inside of the duct by sprinkling water from the

The current measurement unit 1001 measures current values of currents flowing through the signal lines 11 a , 11 c and 11 d and records the measurement results in the storage unit 109 . Specifically, the current measurement unit 1001 measures the voltage Va between the signal line La and the ground at the AD conversion port, thereby obtaining a current value I of the current flowing through the signal line L, for example, I=(Vc−Va )/R2. Current measuring section 1001 is an example of measuring means according to the present invention.

At a predetermined time of the day, the current measurement section 1001 controls the selection section 210 to sequentially connect the signal line La connected to the selection section 210 to the AD conversion port. The current measuring unit 1001 measures the voltage for each connected signal line La, calculates the current value I of the current flowing through the connected signal line La from the measured voltage, and stores the calculated current value in the storage unit 109. Record.

Further, when the GOT 104 is operated to instruct measurement of the current flowing through all the signal lines L, the current measurement unit 1001 controls the selection unit 210 to sequentially connect the signal lines La to the AD conversion ports. . The current measuring unit 1001 measures the voltage for each connected signal line La, calculates the current value of the current flowing through the connected signal line La from the measured voltage, and records the calculated current value in the storage unit 109. .

In addition, the current measurement unit 1001 selects a signal line L for measuring the current value in the GOT 104, and when an operation to instruct measurement of the current flowing through the selected signal line L is performed in the GOT 104, the selected signal line L is selected. A signal line La connected to the signal line L is connected to the AD conversion port. The current measurement unit 1001 measures the voltage of the connected signal line La, calculates the current value of the current flowing through the connected signal line La from the measured voltage, and records the calculated current value in the storage unit 109 .

When measuring the voltage Va, the current measurement unit 1001 controls the selection unit 210 and then starts sampling the voltage Va between the signal line La and the ground after a preset time has elapsed. Current measurement section 1001 ends sampling when a predetermined time has elapsed since the start of sampling of voltage Va. The sampling cycle is preset and stored in the storage unit 109 , and the current measurement unit 1001 performs sampling at the cycle stored in the storage unit 109 . The sampling period is set to, for example, a period of less than 1 second. The sampling time is also preset and stored in the storage unit 109 , and the current measurement unit 1001 performs sampling during the time stored in the storage unit 109 . The sampling time is set in seconds. The sampling period and sampling time can be changed by the user, and can be changed by operating the GOT 104 .

The current measurement unit 1001 calculates a current value I for each voltage Va obtained for each sampling, and records the calculated current value I and the average value of the calculated current values I in the storage unit 109 . The current measuring unit 1001 is also an example of recording means according to the present invention.

As the current flowing through the signal line L increases, the voltage Va between the signal line L and the common line C increases in proportion to the increase in the current flowing. For example, when the insulation of the signal line 11a deteriorates, the insulation resistance decreases and the current flowing through the signal line 11a increases, so the voltage Va between the signal line L and the common line C increases. When the voltage Va changes, the current value I obtained by the above equation changes, so the current measurement unit 1001 measures the current flowing through the signal line L and monitors changes in the current value I stored in the storage unit 109. Thus, deterioration of insulation of the signal line can be determined.

The detection unit 1002 analyzes the current value I recorded in the storage unit 109, and detects deterioration of insulation of the signal line, noise superimposed on the signal of the signal line, and lightning surge from the outside. The detection unit 1002 is an example of detection means according to the present invention.

The GUI unit 1005 displays various screens on the GOT 104 according to operations performed on the GOT 104 and operations performed on the operation unit 105 . For example, the GUI unit 1005 displays the measurement result stored in the storage unit 109 on the GOT 104 when an operation to display the measurement result of the measured current value is performed. When the GOT 104 displays the measurement results, it is possible to display the measurement results in terms of values, or to graphically display changes in current values over time due to sampling. The GUI section 1005 is an example of display means according to the present invention.

(Example of operation of embodiment)
Next, an operation example when the current measuring unit 1001 performs measurement and detects external noise on the signal lines 11a, 11c, and 11d will be described.

FIG. 4 is an example of a GUI screen (automatic measurement screen) displayed by the GOT 104 when measuring currents flowing through the signal lines 11a, 11c, and 11d. For example, when a user who inspects the signal lines 11a, 11c, and 11d presses the button B3 shown in FIG. are sequentially connected to the AD conversion ports. The current measurement unit 1001 measures the voltage for each connected signal line La, calculates the current value of the current flowing through the connected signal line La from the measured voltage, and calculates the average value of the calculated current value and the current value. Record in the storage unit 109 . The current measurement unit 1001 updates the GUI screen and displays the average value each time the measurement of the current value flowing through one signal line La is completed. For example, when the current measurement unit 1001 completes the measurement of the signal line La with the line number 003 assigned to each signal line La for identification of the signal line La, the current measurement unit 1001 sets the average value of the calculated current values to "No .” column and “003” row. In the screen example of FIG. 4, the lower limit of the threshold for determining that the current value is abnormal, the upper limit of the threshold for determining that the current value is abnormal, and the measured current value are displayed for each line number. ing.

The detection unit 1002 determines that the difference between the calculated minimum and maximum current values is less than a predetermined threshold value, and that the calculated average value is equal to or greater than the upper threshold value or equal to or less than the lower threshold value. In this case, it is determined that the current value of the signal line is abnormal, and deterioration of the insulation of the signal line is detected. When the detection unit 1002 detects the insulation deterioration of the signal line, the GUI unit 1005 highlights the measured value column of the line number in which the insulation deterioration is detected. It should be noted that the condition that the difference between the calculated minimum and maximum current values is less than a predetermined threshold may not be mandatory as the condition for determining that the current value is abnormal.

By the way, even if the insulation of the signal line is not degraded, the measured current value will be abnormal if lightning surge, induction noise, radio noise, etc. are superimposed on the signal line during sampling. may become. A user can determine the occurrence of a lightning surge, induction noise, or radio noise by checking the measurement result of each sampling of the current measurement unit 1001 .

In the present embodiment, the measurement result obtained by sampling by the current measurement unit 1001 can be graphed and displayed on the GOT 104 . For example, after selecting one of the rows in the "No." column of the signal line on the screen of FIG. Displays a graph of the current value measurement results.

FIG. 5 is a diagram showing an example of a screen displayed on the GOT 104 by operating the button B1. As shown in FIG. 5, when the current value decreases and converges after changing rapidly, the user can determine from the waveform of the graph that a surge current has occurred in the signal line. Also, although not shown, the user can determine from the waveform of the graph that induction noise or radio wave noise has occurred when the current continues to change in the graph.

According to the present embodiment, since changes over time in current measurement results are displayed in a graph, the user can determine the presence or absence of external noise on the signal line by viewing changes in the current value in the graph.

[Modification]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented in various other forms. For example, the present invention may be implemented by modifying the above-described embodiment as follows. It should be noted that the above-described embodiment and the following modifications may be combined with each other.

In the present invention, the detection unit 1002 may detect noise superimposition and lightning surges by analyzing measurement results obtained by sampling. For example, when induction noise or radio wave noise is superimposed on the signal of the signal line while the current measuring unit 1001 is sampling, the sampled current value fluctuates, and the period of fluctuation continues. When the period during which the calculated current value is out of the predetermined range exceeds the predetermined time, the detection unit 1002 determines that induction noise or radio wave noise is superimposed on the signal line. Detects superposition of noise on lines. The GUI unit 1005 may change the background of the measurement value column to a predetermined color when the detection unit 1002 detects that noise is superimposed on the signal line.

In addition, when a surge current occurs in the signal line while the current measurement unit 1001 is sampling, the sampled current value abruptly fluctuates. When the period during which the calculated current value exceeds a predetermined value is within a predetermined period of time in the measurement result of the current value over time, the detection unit 1002 determines that a surge current has occurred, and outputs a signal Detects the occurrence of surge current in the line. The GUI unit 1005 may change the background of the measurement value column to a predetermined color when the detection unit 1002 detects that a surge current has occurred in the signal line. It should be noted that the detection unit 1002 may detect the occurrence of a surge current by pattern matching between the pattern of changes in the current value over time and the pattern of the surge current.

In the above-described embodiment, the signal line 11a, the signal line 11c, and the signal line 11d connected to the AD conversion port are sequentially switched, and the current values of each of the plurality of signal lines 11a, 11c, and 11d are measured. However, the configuration for measuring the current values of the signal lines 11a, 11c, and 11d is not limited to the configuration of the embodiment. For example, when the control unit 101 has the same number of AD conversion ports as the signal lines 11a, 11c, and 11d, one signal line is connected to one AD conversion port, and a plurality of signal lines are connected. may be measured in parallel.

In the above-described embodiment, the current flowing through the signal line connecting the terminal equipment installed in the tunnel and the disaster prevention receiver 10 is measured by the disaster prevention receiver 10. The fire receiver may be used to measure the current flowing through the signal line connecting the fire receiver installed in the building and the heat and smoke detectors and transmitters.
In the above-described embodiment, the voltage Va is measured and the current value I calculated from the voltage Va is recorded in the storage unit 109. However, in the present invention, the voltage Va measured at the AD conversion port is stored in the storage unit 109. It is also possible to use the voltage Va instead of the current value I to determine insulation deterioration of the signal line, detect noise from the outside, and display the recorded measurement results in a graph.

DESCRIPTION OF SYMBOLS 1... Disaster prevention system, 2a, 2b... Tunnel, 3... Communication network, 5... Section, 10... Disaster prevention receiving panel, 11a, 11b, 11c, 11d... Signal line, 21... Pump control panel, 30... Remote control equipment, 31 ... temperature detector, 32 ... fire detector, 33 ... fire hydrant device, 34 ... manual reporting device, 101 ... control section, 102 ... transmission section, 103 ... communication section, 104 ... GOT, 105 ... operation section, 106 ... alarm section , 107... Pump control unit 108... Display unit 109... Storage unit 200... Input/output unit 201a, 201c, 201d... Signal receiving unit 202a, 202c, 202d... Measurement circuit 210... Selection unit 1001... Current Measuring unit 1002...Detecting unit 1004...Monitoring unit 1005...GUI unit.

Claims (3)

a measuring means for sampling and measuring a current value flowing through a signal line;
a recording means for recording the measurement result of the measuring means;
a detection means for detecting external noise to the signal line based on the measurement results recorded in the recording means;
A disaster prevention system with a measuring means for sampling and measuring a current value flowing through a signal line;
a recording means for recording the measurement result of the measuring means;
display means for displaying the measurement results recorded in the recording means in a graph;
a detection means for detecting external noise to the signal line based on the measurement results recorded in the recording means;
A disaster prevention system with The disaster prevention system according to claim 1 or 2, wherein the sampling period is less than 1 second.

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