JP2021122141A - Disaster prevention system - Google Patents

Abstract

To enable the correct determination of an insulation deterioration state by continuing the measurement record of a line current without being troubled by a current value abnormality alarm, even when the current value abnormality alarm is issued through regular measurement of a signal link current connected to a terminal apparatus.SOLUTION: In a disaster prevention system, a terminal apparatus including a notification device and detectors 16, 18 is connected to a disaster prevention reception board 10 through a signal link, so as to monitor an abnormality in a monitor area. Line current monitor means 72 of the disaster prevention reception board 10 measures and records a current value which flows through the signal link, connected to the terminal apparatus, for each predetermined period. When the measured current value satisfies a predetermined determination condition, the line current monitor means 72 determines a current value abnormality to issue an alarm, and also notifies an outside remote monitor control facility 27 of a current value abnormality to make an alarm. When a current value abnormality is determined in one of a plurality of signal links, the predetermined determination condition of the signal link determined as current value abnormality is changed, so as to make the determination of current value abnormality more difficult than before the change.SELECTED DRAWING: Figure 2

Description

The present invention relates to a disaster prevention system that monitors abnormalities in a tunnel by connecting terminal devices such as a notification device and a detector installed in the tunnel to a disaster prevention receiver.

Conventionally, emergency facilities have been installed in tunnels such as motorways to protect people and vehicles from fire accidents that occur in the tunnels.

Such emergency facilities include fire detectors, manual notification devices, emergency telephones for fire monitoring and reporting, fire extinguishing plug devices for extinguishing fires and preventing the spread of fire, and tunnel skeletons. In order to protect the inside of the duct from fire, water spray that sprinkles fire extinguishing water from the water spray head is installed, and a disaster prevention receiver is installed to monitor and control the terminal equipment of these emergency facilities to build a tunnel disaster prevention system. doing.

The tunnel disaster prevention system consisting of a disaster prevention receiver and terminal equipment is roughly divided into an R-type transmission system and a P-type direct delivery system. The R-type transmission method connects a terminal device such as a fire detector whose address is set to a transmission line, and enables individual management in which detection and control are performed for each terminal device by transmission control. In the P-type direct delivery method, a plurality of terminal devices belonging to the same section are connected to a signal line drawn out in a predetermined section unit according to the type of the terminal device, and detection and control are performed for each signal line.

The R-type transmission type tunnel disaster prevention system has various advantages in terms of function and management because it can be individually detected and controlled by a terminal device. On the other hand, the P-type direct transmission type tunnel disaster prevention system does not need to provide a transmission control function in the fire detector, and it is not necessary to provide a relay amplification board even if the transmission distance becomes long. In comparison, the system configuration is simple and inexpensive.

As a tunnel disaster prevention system, consider the advantages and disadvantages of the R-type transmission method and the P-type direct delivery method, the tunnel length, the traffic volume of vehicles, etc., and construct an R-type transmission method or a P-type direct delivery method tunnel disaster prevention system. I have to.

By the way, in the P-type direct delivery type tunnel disaster prevention system, terminal devices such as a manual notification device, a fire extinguisher activation device, and a duct temperature detector have a signal output unit for operation or detection configured as a non-voltage a contact switch. A non-voltage a contact switch is connected to the signal line drawn from the disaster prevention receiver. The non-voltage a-contact switch is normally turned off in the monitoring state, and is turned on by an operation or detection operation to output a non-voltage contact signal.

Specifically, the power supply voltage is applied to one of the signal lines from the disaster prevention receiver side via a pull-up resistor, and in the steady monitoring state when the non-voltage a contact switch is turned off, most of the current consumption flows through the signal line. However, the power supply voltage between the signal lines seen from the disaster prevention receiver is kept at approximately the power supply voltage. When the non-voltage a contact switch is turned on, a current flows through the signal line, the voltage between the signal lines as seen from the disaster prevention receiving board drops to almost zero volt, and the disaster prevention receiving board increases the current consumption of the signal line or between the signal lines. Detects a voltage drop and outputs a received signal indicating the operation or detection of the terminal device to the control unit.

For example, in the case of a fire report signal from a manual report device, the disaster prevention receiver performs control operations such as fire display, lighting control of the response lamp on the terminal side, manual report section display, and output of the fire extinguishing pump start signal, and also performs remote monitoring. A fire alarm signal is sent to external equipment such as control equipment, TV monitoring equipment, variable road information board equipment, tunnel ventilation equipment, and lighting equipment so that prescribed countermeasure control can be performed.

Japanese Unexamined Patent Publication No. 2002-246962 Japanese Unexamined Patent Publication No. 11-128381 Japanese Unexamined Patent Publication No. 10-248951

By the way, in such a conventional P-type direct tunnel disaster prevention system, the insulation deteriorates due to aged deterioration of the signal line (outside line cable) connecting the terminal equipment, and the terminal equipment is connected. More current than expected in the normal monitoring state flows through the signal line, and the disaster prevention receiver determines that signal reception is due to the operation or detection operation of the terminal equipment and performs an alarm operation, as well as remote monitoring control equipment, TV monitoring equipment, and variable. It often happens that tunnels are closed by linking other equipment such as road information board equipment, tunnel ventilation equipment, and lighting equipment.

In order to solve this problem, the current flowing through the signal line connected to the terminal device provided with the non-voltage a contact switch on the disaster prevention receiver is periodically measured and recorded, for example, once a day, and further. When the measured current exceeds a predetermined threshold, an abnormality in the current value of the signal line is determined and an alarm is given, and further, an abnormality signal in the current value of the signal line is transmitted from the disaster prevention receiver to the remote monitoring and control equipment to give an alarm. Is being considered.

In this way, when the disaster prevention receiver is provided with a function to measure and record the current value of the signal line and monitor the insulation deterioration, even if a current value abnormality occurs and an alarm is issued, the signal that immediately caused the current value abnormality Do not perform maintenance management such as replacing the line to recover from the failure, and plan and respond to the signal line replacement work while judging the progress of insulation deterioration of the signal line by looking at the current value measurement record. Therefore, it takes a certain period of time to recover from the failure by exchanging the signal line.

However, when the current value abnormality is determined and an alarm is issued, the current value abnormality is determined every time the current measurement is performed periodically, and the alarm output is repeatedly performed by the disaster prevention receiver and the remote monitoring and control equipment, and each time. There is a problem that it is necessary to deal with the alarm output, which hinders the tunnel monitoring work.

According to the present invention, even if the current of the signal line to which the terminal device is connected is periodically measured and an abnormality in the current value is warned, the measurement record of the line current is continuously deteriorated without being bothered by the alarm of the current value abnormality. The purpose is to provide a disaster prevention system that enables accurate judgment of the situation.

(Disaster prevention system)
The present invention is a disaster prevention system that monitors an abnormality in a monitoring area by connecting a terminal device to a disaster prevention receiver via a signal line.
A line that is connected so that the current value flowing through the signal line can be measured, and when the measured current value satisfies a predetermined judgment condition, it is determined that the current value is abnormal and a current value abnormality signal is transmitted to an external facility to give an alarm. It is characterized by being equipped with a current monitoring means.

(Change of threshold)
The line current monitoring means sets a predetermined determination condition for each signal line, and when it determines that the current value is abnormal in any of a plurality of signal lines, the predetermined determination condition of the signal line determined to be the current value abnormality. To make it more difficult to determine that the current value is abnormal than before the change.

(Mask for current value measurement)
When the line current monitoring means determines that the current value is abnormal in any of the plurality of signal lines, the line current monitoring means excludes the signal line determined to be the current value abnormality from the current value measurement target.

(Judgment of current value abnormality related to environmental conditions)
The line current monitoring means measures a predetermined environmental condition together with the current value of the signal line, and determines a current value abnormality based on the predetermined determination condition according to the measured current value of the signal line and the environmental condition.

(Threshold change due to environmental conditions)
The line current monitoring means changes a predetermined determination condition based on the measurement result of the predetermined environmental condition.

(Threshold change according to temporal changes in environmental conditions)
The line current monitoring means changes a predetermined determination condition for a predetermined period based on the measurement result of the predetermined environmental condition.

(Change threshold according to season and time of day)
The line current monitoring means changes the predetermined determination condition according to the season or the time zone of the day based on the measurement result of the predetermined environmental condition in the time zone of the season or the day.

(Threshold change according to high temperature and humidity and low temperature drying)
The line current monitoring means presets a predetermined determination condition as a predetermined reference current threshold value, changes the reference current threshold value to a higher value when it is determined to be hot and humid from the measurement result of the predetermined environmental condition, and determines the predetermined value. If it is determined that the product is dry at low temperature based on the measurement results of the environmental conditions, the reference current threshold value is changed to a lower value.

(External notification when current value abnormality continues a predetermined number of times)
When the line current monitoring means continuously determines that the current value is abnormal for the same signal line a predetermined number of times, the line current monitoring means transmits a current value abnormality signal to an external facility to give an alarm.

(If an abnormality occurs in the current value, shorten the cycle and measure and record the current value)
The line current monitoring means measures the current value of the signal line at predetermined intervals, and when the current value measurement of the signal line at predetermined cycles determines that the current value is abnormal, the signal line determined to have the current value abnormality , The current value of the signal line is measured every cycle shorter than a predetermined cycle.

(Report to higher-level equipment and stop reporting)
When the line current monitoring means determines that the current value is abnormal, it transmits a current value abnormality signal to an external facility to give an alarm, and then cancels the alarm when a predetermined time has elapsed from the notification.

(Effect of recovery operation for abnormal current value)
The present invention relates to a tunnel disaster prevention system in which a terminal device including a notification device and a detector is connected to a signal line drawn from a disaster prevention receiver into a tunnel to monitor the terminal device. The current value flowing through the connected signal line is measured and recorded, and when the measured current value exceeds or exceeds a predetermined threshold value, it is determined that the current value is abnormal and an alarm is given, and the current value abnormal signal is sent to the external higher-level equipment. When a recovery operation by the disaster prevention receiver or higher-level equipment is detected, a line current monitoring means is provided to cancel the current value abnormality and restart the current value measurement at predetermined cycles. Even if an abnormal current value occurs and an alarm is issued, the current value alarm can be continuously measured and recorded by performing a recovery operation, and the insulation deterioration of the signal line can be seen from the change in the recorded current value. Judge the tendency and make it possible to deal with it appropriately.

(Effect of changing the threshold)
Further, the line current monitoring means sets a threshold value for determining a current value abnormality for each line, and when it is determined that the current value abnormality is determined, the threshold value is changed so as not to determine the current value abnormality. Even if a current value abnormality occurs and an alarm is issued, for example, by changing the threshold value to a higher value so as not to determine this current value abnormality, the current until the current value abnormality is determined by the changed threshold value. No alarm for abnormal value is issued, and the current value can be continuously measured and recorded without being bothered by the alarm for abnormal current value, and the tendency of insulation deterioration in the signal line can be judged from the change in the recorded current value. And make it possible to deal with it appropriately.

(Effect of mask for current value measurement)
Further, when the line current monitoring means determines that the current value is abnormal in any of a plurality of signal lines, the measurement of the current value of the signal line determined to be abnormal is suppressed, so that the current value abnormality is determined. By excluding the signal line from the measurement target, it is possible to continue the measurement recording of the current value of another signal line even if the insulation deteriorates in a specific signal line.

(Effect of determining current value abnormality related to environmental conditions)
Further, the line current monitoring means measures a predetermined environmental condition together with the current value of the signal line, and determines a current value abnormality in relation to the measured environmental condition. For example, the line current monitoring means sets the temperature as the environmental condition. The threshold value for measuring one or both of the humidity and determining the current value abnormality according to the one or both of the temperature and the humidity is changed. Specifically, the line current monitoring means sets a predetermined reference threshold value. Because it was set in advance, the reference threshold was changed to a higher threshold when it was judged to be hot and humid from the temperature and humidity, and the reference threshold was changed to a lower threshold when it was judged to be low temperature dry from the temperature and humidity. For example, when insulation deterioration occurs temporarily due to environmental conditions such as high temperature and humidity, by changing the threshold value according to changes in the environmental conditions, it is possible to avoid being judged as an abnormal current value, and unnecessary alarm output is generated. It is possible to deter.

(Effect of changing the threshold value according to the temporal change of environmental conditions)
Further, the line current monitoring means temporally changes the writing threshold for determining a current value abnormality based on the environmental conditions and the temporal measurement result of the current value, for example, one or both of temperature and humidity and the current value. Based on the temporal measurement result of, the threshold for determining the current value abnormality is changed temporally, so the log that is the measurement result of the temperature or humidity and the current value is artificially checked, for example, it becomes hot and humid. From June to September, when the current value tends to increase, the threshold value is changed to a higher value, and the threshold value is raised during the time period from 10:00 to 18:00, when the temperature is high during the day. By changing the value to and changing the threshold value according to the temporal change of the environmental conditions, it is possible to prevent the current value from being judged to be abnormal and to suppress unnecessary alarm output in advance.

(Effect of high-level notification when current value abnormality continues a predetermined number of times)
In addition, the line current monitoring means sends a current value abnormality signal to the host equipment to give an alarm when it continuously determines that the current value is abnormal a predetermined number of times. Even if insulation deterioration occurs, as long as insulation deterioration does not continue, even if it is determined that the current value is abnormal, the current value abnormality signal is not transmitted to, for example, remote monitoring and control equipment as higher-level equipment, and the current value abnormality is caused by a transient factor. It is possible to suppress unnecessary alarms.

(Effect of measuring and recording the current value by shortening the cycle when an abnormal current value occurs)
Further, when the line current monitoring means determines that the current value is abnormal by measuring the current value of the signal line at each predetermined cycle, the line current monitoring means measures and records the current value of the signal line at each predetermined second cycle shorter than the predetermined cycle. Therefore, for example, when the current value is determined to be abnormal by measuring the current value once a day at predetermined intervals, the signal line determined to be abnormal by changing to the second cycle, which is shorter than that, for example, every hour. By measuring and recording the current value of the current value at short time intervals, it is possible to more accurately grasp and deal with the change in the current value due to insulation deterioration.

(Effects of reporting to higher-level equipment and stopping reporting)
In addition, the line current monitoring means transmits a current value abnormality signal including signal line information to a higher-level facility to give an alarm when it determines that the current value is abnormal, and when a predetermined time has elapsed from the notification, the current value abnormality occurs. Since the signal transmission is stopped and the alarm is canceled, even if the disaster prevention receiver determines that the current value of the signal line is abnormal and an alarm is output, it is specified for the remote monitoring and control equipment, which is an external higher-level facility. Only the alarm of the current value abnormality is output only during the time, and it is possible to avoid that the alarm state of the current value abnormality continues to interfere with the management work.

Explanatory diagram showing the outline of the tunnel disaster prevention system Block diagram showing the outline of the functional configuration of the tunnel disaster prevention system Block diagram showing details of P-type transmission unit Circuit block diagram showing the details of the current measuring unit A flowchart showing the first embodiment of the line current monitoring control for canceling the current value abnormality alarm by the recovery operation. A flowchart showing a second embodiment of line current monitoring control for canceling a current value abnormality alarm by changing a threshold value. A flowchart showing a third embodiment of line current monitoring control that masks the current value measurement of a line with an abnormal current value. A flowchart showing a fourth embodiment of line current monitoring control for determining a current value abnormality based on a threshold value according to environmental conditions. A flowchart showing a fifth embodiment of line current monitoring control for notifying higher-level equipment when a current value abnormality exceeds a predetermined number of times. A flowchart showing a sixth embodiment of line current monitoring control in which the measurement cycle is shortened and the current value is measured and recorded when it is determined that the current value is abnormal. A flowchart showing a seventh embodiment of line current monitoring control that notifies higher-level equipment for a certain period of time to give an alarm when it is determined that the current value is abnormal.

[Overview of tunnel disaster prevention system]
FIG. 1 is an explanatory diagram showing an outline of a tunnel disaster prevention system. As shown in FIG. 1, an up line tunnel 1a and a down line tunnel 1b are constructed as a tunnel for a motorway, and the up line tunnel 1a and the down line tunnel 1b are connected by an evacuation connecting pit 2.

Inside the up line tunnel 1a and the down line tunnel 1b, fire detectors 16 are installed at intervals of, for example, 25 meters or 50 meters along the wall surface in the longitudinal direction of the tunnel. The fire detector 16 sets monitoring areas on both sides of 25 meters or 50 meters on the left and right, detects a flame caused by a fire, and issues a fire.

Further, a duct is formed inside the observer passage in the longitudinal direction of the tunnel in the up line tunnel 1a and the down line tunnel 1b, and pipes and cables are laid in the duct, and the temperature detector in the duct is laid in the duct at predetermined intervals. 18 is installed. The temperature detector 18 in the duct detects a temperature rise in the duct due to a cable fire or the like, and outputs a temperature detection signal by turning on the non-voltage a contact switch that functions as a contact means.

Further, inside the up line tunnel 1a and the down line tunnel 1b, a fire hydrant device 20 and an automatic valve device 22 are installed along the wall surface of the observer passage in the longitudinal direction of the tunnel, for example, at intervals of 50 meters.

The fire hydrant device 20 houses a hose with a nozzle inside the fire hydrant door. In the event of a fire, the fire hydrant door is opened to pull out the hose with a nozzle, and when the fire hydrant valve open / close lever is opened, fire hydrant water is discharged and the fire hydrant valve open / close detection is detected. The switch turns on to start the fire extinguishing pump. Further, the fire hydrant device 20 is provided with a fire extinguisher door, and the fire extinguisher is housed in the door.

Further, the fire hydrant device 20 is provided with a water tap used by the fire brigade, and is provided with a pump start switch operated by the fire brigade member in accordance with the water tap. Further, the fire hydrant device 20 is provided with a notification device door, and the notification device door is provided with a manual notification device (transmitter). Therefore, the fire hydrant device 20 includes a transmitter, a fire hydrant valve open / close detection switch, and a pump start switch as terminal devices, and a fire alarm signal, a fire hydrant detection signal, or a fire hydrant detection signal or a fire hydrant detection signal or Outputs a pump start signal.

Since the fire hydrant valve open / close detection switch and the pump start switch are systematically the same switch that outputs the same pump start signal, they will be described below as the fire hydrant valve open / close detection switch (including the pump start switch). There is. Further, the manual notification device is installed in the emergency telephone box in addition to the fire hydrant device 20, but in the following description, the manual notification device provided in the fire hydrant device 20 will be described as a representative.

The automatic valve device 22 constitutes a water spray facility, opens and drives the main valve by remote opening control of an electric valve for operation, and discharges fire extinguishing water from a plurality of water spray heads installed in the longitudinal direction at the upper part of the tunnel wall surface. And protect the tunnel frame from fire. Therefore, the automatic valve device 22 includes an operating electric valve as a terminal device.

Disaster prevention at a monitoring center, etc. to monitor abnormalities in the tunnel by connecting terminal devices such as a fire detector 16, a duct temperature detector 18, a fire hydrant device 20, and an automatic valve device 22 installed in the tunnel. The receiving board 10 is installed.

From the disaster prevention receiver panel 10, a plurality of P-type signal lines 12 are pulled out from the disaster prevention receiver 10 into the up line tunnel 1a and the down line tunnel 1b for each predetermined section divided in the longitudinal direction of the tunnel, and the fire detector 16 installed in the tunnel is installed. You are connected.

Further, from the disaster prevention receiving panel 10, a plurality of P-type signal lines 12 are pulled out from the disaster prevention receiving panel 10 into the up line tunnel 1a and the down line tunnel 1b by dividing the inside of the tunnel into a section divided in the longitudinal direction and a type of terminal device. As terminal devices other than the fire detector 16, terminal devices such as a manual notification device provided in the fire hydrant device 20, a fire hydrant valve open / close detection switch (including a pump start switch), and a temperature detector 18 in a tunnel are connected.

The P-type signal line 12 is composed of a signal line and a common line, and is a non-voltage a contact provided in each of the manual notification device of the fire extinguisher device 20, the fire extinguishing valve open / close detection switch, the pump start switch, and the temperature detector 18 in the duct. When a switch is connected, a fire alarm signal, a pump start signal, and a temperature detection signal are sent to the disaster prevention receiver 10 by turning on the non-voltage a contact switch and passing a line current by each operation or detection operation. ing.

In addition to the fire detector 16, fire extinguisher device 20, and automatic valve device 22, the emergency facilities of the tunnel include fire extinguishing pump equipment 24, cooling pump equipment 25 for ducts, IG slave station equipment 26, ventilation equipment 28, and alarm display. Board equipment 30, radio rebroadcasting equipment 32, TV monitoring equipment 34, lighting equipment 36, etc. are provided, and except that the IG slave station equipment 26 is connected by a data transmission line, the other equipment is a P-type signal line. 12 is individually connected to the disaster prevention receiver 10. Here, the IG slave station equipment 26 is a communication equipment that connects the disaster prevention receiver 10 and the remote monitoring and control equipment 27, which is a higher-level equipment provided outside, via a network.

The ventilation equipment 28 is equipment that gives energy to the air in the tunnel by the high blowing wind speed operated by the jet fan installed on the ceiling side in the tunnel to generate a ventilation flow in the longitudinal direction of the tunnel.

Further, the alarm display board equipment 30 is equipment for displaying an abnormality in the tunnel on an electric display board to notify the user in the tunnel. The radio rebroadcasting facility 32 is a facility for allowing a driver or the like to receive information from a road administrator in a tunnel. The TV monitoring equipment 34 is equipment for confirming the scale and position of a fire, operating a water spraying equipment, and grasping the situation in a tunnel when evacuation guidance is performed. The lighting equipment 36 is equipment for driving and managing the lighting equipment in the tunnel.

[Disaster prevention receiver configuration]
FIG. 2 is a block diagram showing an outline of the functional configuration of the tunnel disaster prevention system. As shown in FIG. 2, the disaster prevention receiving panel 10 includes a control unit 40, and the control unit 40 is a function realized by executing a program, for example, and the hardware includes various inputs including a CPU, a memory, and an AD conversion port. Use a computer circuit or the like equipped with an output port or the like.

The control unit 40 is provided with a P-type transmission unit 42 in which various terminal devices installed in the tunnel are connected by a P-type signal line 12, and the control unit 40 is provided with a speaker, a buzzer, an alarm indicator, etc. An alarm unit 44 equipped with, a display unit 46 equipped with a liquid crystal display, and an operation unit 48 equipped with various switches are provided, and further, a ventilation facility 28, an alarm display board facility 30, a radio rebroadcasting facility 32, and a television monitoring facility 34 are provided. A P-type transmission unit 52 is provided in which the lighting equipment 36, the fire extinguishing pump equipment 24, and the cooling pump equipment 25 are individually connected by a P-type signal line 12.

The control unit 40 is provided with a monitoring control means 70 and a line current monitoring means 72 as functions realized by executing a program. The monitoring control means 70 performs predetermined monitoring control based on detection signals and operation signals from terminal devices such as a fire detector 16, a duct temperature detector 18, a fire hydrant device 20, and an automatic valve device 22 installed in a tunnel. ..

When the monitoring control means 70 receives a fire notification signal by operating the manual notification device provided in the fire hydrant device 20, for example, the alarm unit 44 sounds the main sound and the display unit 46 displays the fire and the manual notification area. Further, a response signal is transmitted to the fire hydrant device 20 to light the response lamp, and further, a pump start signal is output to the fire extinguishing pump equipment 24 to start the fire extinguishing pump. Further, as control for other equipment, the monitoring control means 70 transmits a fire notification signal to the remote monitoring control equipment 27 via the IG slave station equipment 26 to give an alarm, and the TV monitoring equipment 34 displays the fire notification section. , The alarm display board equipment 30 controls to display a fire report in the manual notification section, the ventilation equipment 28 controls to ventilate the manual notification section, and the lighting equipment 36 controls to illuminate the manual notification section.

Further, when the temperature inside the duct rises and the temperature detection signal is received from the temperature detector 18 inside the duct, the monitoring control means 70 outputs a pump start signal to the cooling pump equipment 25 and sprinkles water from the head installed in the duct. Then, the inside of the duct is controlled to be cooled.

The line current monitoring means 72 determines the current value of the signal line 12 connected to the terminal device provided with the non-voltage a contact switch including the manual notification device, the fire extinguishing valve open / close detection switch, the pump start switch, and the temperature detector 18 in the duct. It is measured every cycle, for example, once a day, and stored in the memory. Control is performed by transmitting a signal to the remote monitoring and control equipment 27, which is an external higher-level equipment, via the IG slave station equipment 26 to give an alarm.

Further, when the line current monitoring means 72 detects a notification signal of the restoration operation by the operation unit 48 or the restoration operation by the remote monitoring and control equipment in a state where the current value abnormality of the signal line 12 is determined and an alarm is given, the current value is detected. Control is performed to cancel the alarm due to an abnormality and restart the current value measurement at predetermined intervals. This control is the first embodiment of the line current monitoring control by the line current monitoring means 72, which will be clarified later.

[P-type transmission unit]
FIG. 3 is a block diagram showing details of a P-type transmission unit provided on the disaster prevention receiver. As shown in FIG. 3, the P-type transmission unit 42 is provided with a plurality of compartment modules 60 corresponding to the compartments of the terminal equipment installed in the tunnel. For example, the tunnel corresponding to the first compartment module 60. In the inner section, a plurality of fire hydrant devices 20 and a duct in-duct temperature detector 18 shown on the right side thereof are arranged.

The fire hydrant device 20 is provided with a manual notification device (transmitter) 54, a fire hydrant valve open / close detection switch 56, and a pump start switch 58 as terminal devices provided with a non-voltage a contact switch.

The partition module 60 is provided with a line receiving unit 62a corresponding to the manual notification device 54, a line receiving unit 62b corresponding to the fire hydrant valve open / close detection switch 56 and the pump start switch 58, and the duct temperature detector 18 is provided. Correspondingly, a line receiving unit 62c is provided.

A plurality of manual notification devices 54 provided in the plurality of fire hydrant devices 20 are connected in parallel to the signal line 12a drawn from the line receiving unit 62a. Therefore, when the non-voltage a contact switch is turned on by operating any of the push buttons of the plurality of manual notification devices 54 belonging to the same section, the line current flows and the line receiving unit 62a receives the fire report signal to specify the section. The fire alarm signal is output to the control unit 40.

Further, a plurality of fire hydrant valve open / close detection switches 56 and a pump start switch 58 provided in the plurality of fire hydrant devices 20 are connected in parallel to the signal line 12b drawn from the line receiving unit 62b. Here, the fire hydrant valve open / close detection switch 56 and the pump start switch 58 output a pump start signal based on an operation related to fire, and are of the same type because they are common as a pump start operation means. Therefore, they are connected in parallel to the same signal line 12b as the same type of terminal equipment.

Therefore, when the user pulls out the hose with a nozzle of the fire hydrant device 20 and operates the fire hydrant valve open / close lever, the fire hydrant valve open / close detection switch 56 is turned on and the line current flows, so that the line receiver 62b sends a pump start signal. The control unit 40 receives the pump start signal that identifies the section.
Output to. Also, when a firefighter opens the door of the fire hydrant device 20, connects the fire hose to the water tap, and turns on the pump start switch 58, the line current flows and the line receiver 62b receives the pump start signal. Then, the pump start signal that identifies the section is output to the control unit 40.

Further, the temperature detector 18 in the duct provided in the same section is connected in parallel to the signal line 12c drawn from the line receiving unit 62c. Therefore, when the detected temperature in the duct becomes equal to or higher than a predetermined threshold temperature by any of the plurality of duct temperature detectors 18 belonging to the same section, the non-voltage a contact switch is turned on and the line current flows to form the line. The receiving unit 62c receives the temperature detection signal and outputs the duct fire detection signal specifying the section to the control unit 40.

Current measuring units 64a to 64c are provided for the line receiving units 62a to 62c provided in the partition module 60. The current measuring units 64a to 64c input the current value detection signal for detecting the current value flowing through each of the signal lines 12a to 12c to the selector unit 65. The selector unit 65 receives a control signal at a predetermined measurement timing having a cycle of once a day by the line current monitoring means 72 provided in the control unit 40 of FIG. 2, and corresponds to the signal line input to the partition module 60. The current value detection signals are sequentially selected and output to the AD conversion port of the control unit 40, and the line current monitoring means 72 converts the analog current value input to the AD conversion port into a digital current value, reads it, and stores it in the memory. Then, the current value of each signal line is measured and recorded periodically.

FIG. 4 is a circuit block diagram showing details of the current measuring unit provided in the P-type transmission unit of FIG. 3, and shows one signal line as an example. As shown in FIG. 4, a non-voltage a contact switch 68 and a terminating resistor 15 provided in the terminal device 14 are arranged in parallel on the signal line 12 composed of the signal line L and the common line C drawn from the disaster prevention receiving panel 10. It is connected, and the non-voltage a contact switch 68 is turned off as shown in the normal monitoring state.

The signal line L of the signal line 12 is pull-up connected to the power supply line of the power supply voltage + Vc by the resistor 66, and the common line C is connected to the ground. Therefore, in the steady monitoring state in which the non-voltage a contact switch 68 of the terminal device 14 is off, the line voltage VL between the signal line L and the common line C of the signal line 12 is the power supply voltage + Vc, and this line. The voltage VL is input to the line receiving unit 62.

When any non-voltage a contact switch 68 of the terminal device 14 connected to the signal line 12 is turned on, the line voltage VL between the signal line L and the common line C drops to substantially zero volt. The line receiving unit 62 includes a switching circuit that turns on when the line voltage VL drops to near zero volt, and outputs a received signal to the control unit 40 when the switching circuit is turned on.

The current measuring unit 64 is a circuit that detects the line voltage VL between the signal line L and the common line C pulled up to the power supply line by the resistor 66 as the current detection signal VL, and has a resistance value of R and a resistance of the terminal resistance 15. Assuming that the value is Rs and the insulation resistance of the signal line 12 is Z, the current I flowing through the signal line 12 when the non-voltage a contact switch 68 is off is given by the following equation.

Here, (RS // Z) is the parallel resistance value.

Represents. Therefore, the current detection signal (line voltage) VL is

Therefore, a current detection signal (line voltage) VL that increases in proportion to the line current I is obtained.

When the insulation deterioration of the signal line 12 occurs, the insulation resistance Z decreases, which increases the current I flowing through the signal line 12 and also increases the current detection signal (line voltage) VL.

The line voltage (current detection signal) VL detected by the current measurement unit 64 is input to the selector unit 65, sequentially read from the selector unit 65 together with other current detection signals at a predetermined measurement timing, and read from the AD conversion port. However, based on the current detection value VL, the line current monitoring means 72 of the control unit 40
I = (Vc-VL) / R (Equation 3)
As a result, the current value I is obtained and recorded, and it is determined that the current value is abnormal due to the deterioration of the insulation of the signal line as compared with a predetermined threshold value, and an alarm is given.

Further, as another embodiment of the current measuring unit 64, a current detection resistor is inserted and connected to the signal line L side following the pull-up connection point by the resistor 66, and the current detection voltage generated at both ends of the current detection resistor proportional to the current. Is sequentially read from the selector unit 65 together with other current detection signals at a predetermined measurement timing, and is read and recorded as a current detection value from the AD conversion port by the line current monitoring means 72 of the control unit 40. , A current value abnormality due to insulation deterioration of the signal line may be determined and an alarm may be given in comparison with a predetermined threshold value.

[First Embodiment of Line Current Monitoring Control]
FIG. 5 is a flowchart showing the first embodiment of the line current monitoring control for canceling the current value abnormality alarm by the recovery operation. In the first embodiment of the line current monitoring control by the line current monitoring means 72 provided in the control unit 40 of FIG. 2, as described above, the current value abnormality is determined and warned, and the current value abnormality signal is sent to the remote monitoring control equipment. It is transmitted to 27 to give an alarm, and when a recovery operation by the disaster prevention receiver 10 or the remote monitoring control equipment 27 is detected during the alarm, the alarm state due to the current value abnormality is canceled and the current value measurement is restarted at predetermined intervals. It is characterized by doing so.

As shown in FIG. 5, when the line current monitoring means 72 determines in step S1 that the line current measurement timing has reached a predetermined time, for example, once a day, the line current monitoring means 72 proceeds to step S2 and sets the line number N to N = 1. Then, in step S3, the current value of the first signal line determined by N = 1 under the control of the selector unit 65 shown in FIG. 3 is measured and recorded in the memory.

Subsequently, it is determined whether or not the current value measured in step S4 is equal to or greater than a predetermined threshold value (or whether or not the threshold value is exceeded), and if it is determined that the current value is equal to or greater than a predetermined threshold value, the process proceeds to step S5. It is determined that the current value is abnormal due to the deterioration of the insulation of the signal line, an acoustic alarm is displayed by the alarm unit 44 of the disaster prevention receiver 10 and an alarm is displayed by the display unit 46. A current value abnormality signal is transmitted to the remote monitoring and control equipment 27 of the above to give an alarm. If the current value is less than the threshold value in step S4, the processes of steps S5 to S7 are skipped.

Subsequently, until the line number N reaches the maximum value Nmax, the line number N is increased by one in step S9, and the process from step S3 is repeated. When the measurement and recording of the current values of all the signal lines and the determination of the current value abnormality are completed, the process proceeds to step S10, and it is determined whether or not the current value abnormality is currently being alarmed. It is determined whether or not there is a direct abnormality recovery operation by the disaster prevention receiver 10 or a distant abnormality recovery operation by the distant monitoring and control equipment 27.

When the abnormality recovery operation by direct or distant is determined in step S11, the process proceeds to step S12, the current value abnormality alarm is restored, the alarm state is released, and the process returns to step S1 to wait for the next line current measurement timing.

According to the first embodiment of such line current monitoring control, even if a current value abnormality occurs once and an alarm is issued, the disaster prevention receiving panel 10 or the distant monitoring control equipment 27 performs a recovery operation operation. The alarm state is canceled, the current value can be continuously measured and recorded, and the tendency of insulation deterioration of the signal line can be judged from the change in the recorded current value and appropriately dealt with.

[Second Embodiment of Line Current Monitoring Control]
FIG. 6 is a flowchart showing a second embodiment of the line current monitoring control that cancels the alarm of the current value abnormality by changing the threshold value. In the second embodiment of the line current monitoring control by the line current monitoring means 72 of FIG. 2, a threshold value for determining a current value abnormality is set for each line, and when the current value abnormality is determined, the current value abnormality is not determined. It is characterized in that the threshold value is changed as described above.

As shown in FIG. 6, the processing of steps S21 to S32 by the line current monitoring means 72 is the same as the processing of steps S1 to S12 of FIG. 5, and thus the description thereof will be omitted.

When the line current monitoring means 72 determines the abnormality recovery operation by direct or distant in step S31, the line current monitoring means 72 proceeds to step S32, recovers the current value abnormality alarm and cancels the alarm state, and then proceeds to step S33 to proceed to the current value abnormality. The threshold value set in the signal line determined to be is read and displayed on the display unit 46, and when the threshold value change operation by the operation unit 48 is determined in step S34, the current threshold value is changed so as not to be determined as a current value abnormality in step S35. do.

This threshold change changes the current threshold to a higher threshold. To change the threshold value, a predetermined threshold value increase value may be added to the current threshold value, or a predetermined coefficient of 1 or more may be multiplied. However, the upper limit is set for the increase in the threshold value, and no further increase is made.

Subsequently, the processing from step S33 is repeated until the processing for changing the threshold value is performed for all the signal lines having abnormal current values in step S36, and when this is completed, the process returns to step S21 and waits for the next line current measurement timing.

According to the second embodiment of such line current monitoring control, even if a current value abnormality occurs once and an alarm is issued, for example, the threshold value is changed to a higher value so as not to determine this current value abnormality. By doing so, the current value abnormality alarm is not issued until the current value abnormality is determined by the changed threshold value, and the current value can be continuously measured and recorded without being bothered by the current value abnormality alarm. It is possible to judge the tendency of insulation deterioration in the signal line from the change in the recorded current value and take appropriate measures.

[Third Embodiment of line current monitoring control]
FIG. 7 is a flowchart showing a third embodiment of line current monitoring control that masks the current value measurement of the line having an abnormal current value. In the third embodiment of the line current monitoring control by the line current monitoring means 72 of FIG. 2, when the current value abnormality is determined in any of the plurality of signal lines, the current value of the signal line determined to be the current value abnormality is measured. It is characterized by performing mask processing to suppress.

As shown in FIG. 7, the processes of steps S41, S42 and S44 to S53 by the line current monitoring means 72 are the same as the processes of steps S1 to S12 of FIG. 5, and the process of step S43 is newly added.

In step S43, the line current monitoring means 72 determines whether or not the signal line is determined to have an abnormal current value in the previous processing, and in the case of a signal line not determined to be abnormal in current value, in steps S44 to S48. By processing, the current value of the signal line is measured and recorded, and the measured current value is compared with the threshold value to determine the presence or absence of current value abnormality. The equipment 27 outputs an alarm for abnormal current value.

On the other hand, when the signal line for which the current value abnormality has been determined is determined in step S43, the processing of steps S44 to S48 is skipped, so that the current value for the signal line is not measured and recorded, and the current value abnormality is determined. The signal line is masked to be excluded from the monitoring target.

According to the third embodiment of such line current monitoring control, by excluding the signal line determined to have an abnormal current value from the measurement target, even if insulation deterioration occurs in a specific signal line, another signal line is used. It is possible to continue the measurement recording of the current value of.

[Fourth Embodiment of Line Current Monitoring Control]
FIG. 8 is a flowchart showing a fourth embodiment of line current monitoring control for determining a current value abnormality based on a threshold value according to environmental conditions. In the fourth embodiment of the line current monitoring control by the line current monitoring means 72 of FIG. 2, a predetermined environmental condition such as temperature and humidity is measured together with the current value of the signal line, and an abnormality of the current value is determined according to the temperature and humidity. It is characterized in that the threshold value to be changed is changed.

To change the threshold value according to the environmental conditions by the line current monitoring means 72, for example, a predetermined reference threshold value is set in advance, and when it is determined from the temperature and humidity that the temperature and humidity are high and high humidity, the reference threshold value is changed to a higher threshold value and the temperature is changed. And when it is judged that the temperature is low temperature drying from the humidity, the reference threshold value is changed to a lower threshold value.

As shown in FIG. 8, when the line current monitoring means 72 determines that the predetermined line current measurement timing has been reached in step S61, the line current monitoring means 72 proceeds to step S62 to measure the temperature by the temperature detector installed in the tunnel and the humidity. Humidity is measured by a detector and captured.

Subsequently, the process proceeds to step S63, and the threshold value for determining the current value abnormality is changed according to the temperature and humidity measured and taken in in step S62. Since this threshold change tends to cause insulation deterioration of the signal line 12 under the environmental conditions of high temperature and humidity in summer, the reference threshold is changed to a higher threshold and temporary insulation is caused by the environmental conditions. It is possible to determine that the current value is abnormal due to deterioration and prevent an alarm.

Subsequently, the processes of steps S64 to S74 are performed, but since this process is the same as steps S2 to S12 of FIG. 5, the description thereof will be omitted.

As a modification of the fourth embodiment of the line current monitoring control that changes the threshold value according to the environmental conditions, the line current monitoring means 72 has an abnormality in the current value based on the environmental conditions and the temporal measurement result of the current value. The threshold value for determining the above may be changed with time.

In this case, the line current monitoring means 72 artificially confirms the log which is the measurement result of the temperature or humidity and the current value, for example, and the current value tends to increase due to high temperature and humidity, for example, from June to September. Changes the reference threshold to a high threshold, and changes the reference threshold to a high threshold during the time zone from 10:00 to 18:00 when the temperature is high in the time zone of the day, and thus the time of the environmental condition. By changing the threshold value according to a specific change, it is possible to avoid the determination of the current value abnormality and suppress unnecessary alarm output in advance.

Here, the change of the threshold value corresponding to the temporal change of the environmental condition is automatically performed according to the passage of time by storing the threshold value that changes with time according to the season or the time zone of the day in advance. The threshold value may be changed and set manually, or the threshold value may be changed temporally by manual operation.

[Fifth Embodiment of line current monitoring control]
FIG. 9 is a flowchart showing a fifth embodiment of line current monitoring control for notifying higher-level equipment when a current value abnormality exceeds a predetermined number of times. In the fifth embodiment of the line current monitoring control by the line current monitoring means 72 of FIG. 2, when the current value abnormality of the signal line is continuously determined a predetermined number of times, the current value abnormality signal is transmitted to the higher-level equipment to give an alarm. It is characterized by that.

As shown in FIG. 9, the processing of steps S81 to S87 by the line current monitoring means 72 is the same as the processing of steps S1 to S6 of FIG. 5, and thus the description thereof will be omitted.

When the measurement and recording of the current values of all the signal lines and the determination of the current value abnormality are performed by the processing of S81 to S87 and the process proceeds to step S89, whether or not the determination of the current value abnormality continues for the same signal line more than a predetermined number of times. If the number of continuations is less than the predetermined number of times, step S90 is skipped and the current value abnormality signal is not transmitted to the remote monitoring control equipment 27, and the current value abnormality continues for the predetermined number of times or more in step S89. When the determination is made, the process proceeds to step S90, and at this stage, the remote monitoring and control equipment 27 is notified by transmitting a current value abnormality signal for the first time to give an alarm.

Since the processing of steps S91 to S93 following this is the same as that of steps S10 to S12 of FIG. 5, the description thereof will be omitted.

According to the fifth embodiment of such line current monitoring control, even if the insulation deterioration of the signal line occurs temporarily due to a change in environmental conditions or the like, even if it is determined that the current value is abnormal unless the insulation deterioration continues. The current value abnormality signal is not transmitted to the remote monitoring and control equipment 27 and the like, and it is possible to suppress an unnecessary alarm for the current value abnormality due to a transient factor.

[Sixth Embodiment of Line Current Monitoring Control]
FIG. 10 is a flowchart showing a sixth embodiment of line current monitoring control for notifying higher-level equipment when a current value abnormality exceeds a predetermined number of times. The sixth embodiment of the line current monitoring control by the line current monitoring means 72 of FIG. 2 is characterized in that when it is determined that the current value is abnormal, the measurement cycle is shortened and the current value is measured and recorded.

As shown in FIG. 10, when the line current monitoring means 72 determines in step S101 that the first timing of the line current measurement at a predetermined time, for example, once a day is reached, the line number N is set to N = in step S102. The initial setting is set to 1, and the processes of steps S103 to S109 are subsequently performed. However, since this process is the same as the process of steps S3 to S9 of FIG. 5, the description thereof will be omitted.

Subsequently, the line current monitoring means 72 proceeds to step S111 if there is a signal line having a current value abnormality in step S110 based on the current value measurement of the signal line 12 and the determination result of the current value abnormality. It is determined whether or not the first measurement timing is once a day, and if not, the process proceeds to step S112, and it is determined whether or not the second measurement timing is shorter than the cycle of the first measurement timing, for example, once an hour. When it is determined that the measurement timing has been reached, the process proceeds to step S113, the current value of the signal line for determining the current value abnormality is measured and recorded, and the measurement of all the signal lines for which the current value abnormality is determined is completed in step S114. The process of step S113 is repeated until.

Subsequently, the processes of steps S115 and S116 are performed, but since this is the same as steps S11 and S12 of FIG. 5, the description thereof will be omitted.

According to the sixth embodiment of such line current monitoring control, for example, when it is determined that the current value is abnormal by measuring the current value once a day at predetermined cycles, the current value is changed to a shorter second cycle. By measuring and recording the current value of the signal line that determines the current value abnormality at short time intervals, it is possible to more accurately grasp and deal with the change in the current value due to insulation deterioration.

[Seventh Embodiment of Line Current Monitoring Control]
FIG. 11 is a flowchart showing a seventh embodiment of line current monitoring control that notifies higher-level equipment for a certain period of time to give an alarm when it is determined that the current value is abnormal. In the seventh embodiment of the line current monitoring control by the line current monitoring means 72 of FIG. 11, when it is determined that the current value of the signal line is abnormal, the current value abnormality signal including the signal line information is transmitted to the remote monitoring control equipment 27. When a predetermined time elapses, the transmission of the current value abnormality signal is stopped to cancel the current value abnormality alarm in the remote monitoring and control equipment 27.

As shown in FIG. 11, the processing of steps S121 to S126 by the line current monitoring means 72 is basically the same as the processing of steps S1 to S6 of FIG. 5, but the step of FIG. 11 corresponding to step S6 of FIG. In the processing of S126, the disaster prevention receiver 10 issues a current value abnormality alarm, but at this stage, the current value abnormality signal is not transmitted to the remote monitoring and control equipment 27, and the current value abnormality alarm is not performed. It's different.

The remote monitoring and control equipment 27 proceeds to step S129 after the processes of steps S121 to S128 are completed, and if there is a signal line with an abnormal current value, the current value abnormal signal including line information is sent to the remote monitoring and control equipment 27 in step S130. Is transmitted, and the remote monitoring and control equipment 27 causes an alarm output of a current value abnormality including line information.

Subsequently, in step S131, when the distant monitoring and control equipment 27 determines the elapse of a predetermined time that can respond to the current value abnormality alarm, the process proceeds to step S132, and the transmission of the current value abnormality signal to the distant monitoring and control equipment 27 is stopped. , Cancel the alarm output.

Subsequently, the processes of steps S133 and S134 are performed, but since this is the same as steps S11 and S12 of FIG. 5, the description thereof will be omitted.

According to the seventh embodiment of such line current monitoring and control, even if the disaster prevention receiver 10 determines that the current value is abnormal for the signal line and outputs an alarm, it is an external higher-level equipment, for example, a remote monitoring and control equipment 27. Then, only the alarm of the current value abnormality is output only for a predetermined time, and the alarm state of the current value abnormality continuously interferes with the management work in the remote monitoring control equipment 27 that centrally monitors a plurality of tunnels. It is possible to avoid coming.

[Modification of the present invention]
(Terminal device)
In the above embodiment, as a terminal device connected to a signal line that measures and monitors the current value due to insulation deterioration, a manual notification device, a fire extinguisher valve open / close detection switch, a pump start switch, and a temperature detector in a duct are taken as examples. If the terminal device has the non-voltage a contact switch connected to the signal line from the disaster prevention receiver, other appropriate terminal devices are included.

(Monitoring the disconnection of the signal line)
Further, in the above embodiment, when the measured current value of the signal line exceeds a predetermined threshold value or exceeds the upper limit threshold value due to insulation deterioration, it is determined that the current value is abnormal, but the current value flows to the signal line in the normal monitoring state. A predetermined lower limit threshold value lower than the current consumption may be set, and when the measured current value is equal to or lower than the lower limit threshold value or lower than the lower limit threshold value, it may be determined that the current value is abnormal and an alarm may be given. Such a current value abnormality that is below or below the lower limit threshold value detects and warns of a disconnection failure of the signal line.

(others)
In addition, the present invention includes appropriate modifications that do not impair its purpose and advantages, and is not further limited by the numerical values shown in the above embodiments.

1a: Up line tunnel 1b: Down line tunnel 10: Disaster prevention receiver 12: Signal line 14: Terminal equipment 16: Fire detector 18: Duct temperature detector 20: Fire hydrant device 22: Automatic valve device 24: Fire extinguishing pump equipment 25 : Cooling pump equipment 26: IG slave station equipment 27: Remote monitoring and control equipment 28: Ventilation equipment 30: Alarm display board equipment 32: Radio rebroadcasting equipment 34: TV monitoring equipment 36: Lighting equipment 40: Control units 42, 52: P Type transmission unit 44: Alarm unit 46: Display unit 48: Operation unit 54: Manual notification device 56: Fire hydrant valve open / close detection switch 58: Pump start switch 60: Partition module 62: Line receiver 64: Current measurement unit 65: Selector unit 68: Non-voltage a contact switch 70: Monitoring control means 72: Line current monitoring means

Claims (10)

It is a disaster prevention system that monitors abnormalities in the monitoring area by connecting terminal equipment to the disaster prevention receiver via a signal line.
When the current value flowing through the signal line is measurable and the measured current value satisfies a predetermined determination condition, it is determined that the current value is abnormal and a current value abnormality signal is transmitted to an external facility to give an alarm. Equipped with line current monitoring means
When the line current monitoring means sets the predetermined determination condition for each signal line and determines that the current value is abnormal in any of a plurality of signal lines, the line current monitoring means of the signal line determined to be the current value abnormality. A disaster prevention system characterized in that a predetermined judgment condition is changed so that it is difficult to judge that the current value is abnormal as compared with before the change.
It is a disaster prevention system that monitors abnormalities in the monitoring area by connecting terminal equipment to the disaster prevention receiver via a signal line.
When the current value flowing through the signal line is measurable and the measured current value satisfies a predetermined determination condition, it is determined that the current value is abnormal and a current value abnormality signal is transmitted to an external facility to give an alarm. Equipped with line current monitoring means
The line current monitoring means is a disaster prevention system characterized in that, when it is determined that the current value is abnormal in any of a plurality of signal lines, the signal line determined to be the current value abnormality is excluded from the current value measurement target.
It is a disaster prevention system that monitors abnormalities in the monitoring area by connecting terminal equipment to the disaster prevention receiver via a signal line.
When the current value flowing through the signal line is measurable and the measured current value satisfies a predetermined determination condition, it is determined that the current value is abnormal and a current value abnormality signal is transmitted to an external facility to give an alarm. Equipped with line current monitoring means
The line current monitoring means measures a predetermined environmental condition together with the current value of the signal line, and determines the current value abnormality based on the predetermined determination condition according to the measured current value of the signal line and the environmental condition. A disaster prevention system characterized by making judgments.
The disaster prevention system according to claim 3, wherein the line current monitoring means changes the predetermined determination condition based on the measurement result of the predetermined environmental condition.
The disaster prevention system according to claim 4, wherein the line current monitoring means changes the predetermined determination condition for a predetermined period based on the measurement result of the predetermined environmental condition.
In the disaster prevention system according to claim 5, the line current monitoring means determines the predetermined determination condition for the season or the time of the day based on the measurement result of the predetermined environmental condition in the time zone of the season or the day. A disaster prevention system characterized by changing according to the belt.
In the disaster prevention system according to claim 4 or 6, the line current monitoring means presets the predetermined determination condition as a predetermined reference current threshold value, and determines that the temperature and humidity are high from the measurement results of the predetermined environmental condition. A disaster prevention system characterized in that the reference current threshold value is changed to a higher value in some cases, and the reference current threshold value is changed to a lower value when it is determined from the measurement results of the predetermined environmental conditions that the temperature is dry. ..
It is a disaster prevention system that monitors abnormalities in the monitoring area by connecting terminal equipment to the disaster prevention receiver via a signal line.
When the current value flowing through the signal line is measurable and the measured current value satisfies a predetermined determination condition, it is determined that the current value is abnormal and a current value abnormality signal is transmitted to an external facility to give an alarm. Equipped with line current monitoring means
The line current monitoring means is characterized by transmitting the current value abnormality signal to the external equipment to give an alarm when it is determined that the current value abnormality is continuously performed for the same signal line a predetermined number of times. system.
It is a disaster prevention system that monitors abnormalities in the monitoring area by connecting terminal equipment to the disaster prevention receiver via a signal line.
When the current value flowing through the signal line is measurable and the measured current value satisfies a predetermined determination condition, it is determined that the current value is abnormal and a current value abnormality signal is transmitted to an external facility to give an alarm. Equipped with line current monitoring means
The line current monitoring means measures the current value of the signal line at predetermined intervals, and when the current value measurement of the signal line at each predetermined cycle determines that the current value is abnormal, it is determined that the current value is abnormal. A disaster prevention system, characterized in that the current value of the signal line is measured at intervals shorter than the predetermined cycle of the signal line.
It is a disaster prevention system that monitors abnormalities in the monitoring area by connecting terminal equipment to the disaster prevention receiver via a signal line.
When the current value flowing through the signal line is measurable and the measured current value satisfies a predetermined determination condition, it is determined that the current value is abnormal and a current value abnormality signal is transmitted to an external facility to give an alarm. Equipped with line current monitoring means
When the line current monitoring means determines that the current value is abnormal, the line current monitoring means transmits the current value abnormality signal to the external equipment to give an alarm, and then cancels the alarm when a predetermined time elapses. A disaster prevention system featuring.

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