JP5795247B2 - Electrical equipment fire suppression device - Google Patents

Description

  The present invention relates to a fire suppression device for electrical equipment that handles high voltages such as cubicles.

In buildings or construction sites equipped with large-capacity load facilities such as buildings, high voltage such as three-phase AC 6,600V supplied from electric power companies, high-voltage overhead distribution lines or underground high-voltage cables To the electrical equipment that handles high voltage, such as a power receiving panel (cubicle) housed in a metal outer box, where it is stepped down to 100V, 200V, 400V, etc. It is supplied to various electric loads and power loads.
Cubicles are classified into PF-S type and CB type depending on the type of main shut-off device. The PF-S type is used when a high-voltage source fuse (PF) and a high-voltage AC load switch (LBS) are used as the main circuit breaker and the power receiving equipment capacity is 300 kVA or less. Since the shut-off device is simple, there is an advantage that the metal box can be easily downsized. The CB type is used when a CB breaker (VCB (vacuum breaker) is common) is used as a main breaker and the power receiving equipment capacity is 4,000 kVA or less.

Conventionally, in electric facilities that handle high voltages such as cubicles, when a fire breaks out, monitoring personnel rush to the site and use the fire extinguisher near the facility to extinguish the fire.
However, even if a fire alarm is not installed, or there is a fire alarm, the sensitivity is low and the alarm is often delayed, and there is a risk that the fire will become so strong that fatal damage will be caused to the equipment before the observer rushes. Yes, depending on the importance of the equipment, it is necessary to install an automatic fire extinguishing device.
In fires of electrical equipment that handles high voltages, mainly cubicles, etc., cables that have a resin sheath are relatively flammable and become a fire source. Cables cause abnormal heat generation due to electrical overload, but there are many cases in which insulation of insulation deteriorates due to deterioration over time, etc., heat generation of equipment occurs, and resin cable sheaths burn out. .
In some cases, short-circuiting occurs due to the invasion of small animals such as mice and snakes, resulting in a fire from an unexpected site.

Therefore, in electrical equipment that handles high voltages such as cubicles, abnormalities can be detected at an early stage in smoldering fires of cables, etc., and even when an unexpected part fires, a fire can be detected reliably. In addition to being able to extinguish equipment fires, it is desirable to use automatic fire extinguishing equipment that can minimize equipment damage and is inexpensive for industrial use.
Various proposals have been made to solve this problem.
For example, in electrical equipment composed of multiple small compartments, early detection of fire and aerosol extinguishing with a high-sensitivity smoke detector that uses a device that samples the internal air (fire smoke) from each compartment It is disclosed to extinguish fire using a device (for example, see Patent Document 1).
Further, a system is disclosed in which a fire prevention monitoring target space is photographed with an infrared camera, and image processing is performed to determine and warn a heat source that seems to be fire (for example, see Patent Document 2).
Moreover, as a small device for electric fire, a fire extinguishing device for electric appliances and home appliances by a detection method using a combination of a plurality of types of sensors (smoke, temperature, flame, etc.) is disclosed (for example, see Patent Document 3). .

JP 2011-78468 A JP 2000-132863 A JP 2006-334064 A

However, in the fire extinguishing apparatus using the high-sensitivity smoke detector described in Patent Document 1, the installation of the sampling facility and the detector itself are expensive, and the smoke sampling facility becomes large, which requires labor and cost. There is a problem that is very high.
In addition, the facility using the infrared camera described in Patent Document 2 has a problem that both the camera and the image data processing equipment are expensive, and the facility becomes large, requiring time and labor for the construction.
In addition, when concentrated in the high-sensitivity smoke detector as the primary detection, it is not possible to detect an abnormal part in a limited manner, and it is impossible to inject a fire extinguisher only in a specific section. There is a problem that it is difficult to simultaneously monitor a plurality of sealed small sections even in the infrared imaging method.
In addition, as described in Patent Document 3, when a plurality of types of detectors are used to improve the detection accuracy, it is possible to monitor an electric device that easily catches heat and smoke in a small space. There is a problem that equipment cannot be monitored.

  The present invention has been made to solve such conventional problems, and its purpose is to quickly detect abnormalities in electrical equipment, to detect heat generation in the pre-fire stage, and to ensure that a fire occurs. An object of the present invention is to provide a fire suppression device capable of extinguishing electric equipment.

The invention according to claim 1 is a cubicle including a disconnector or a high-voltage AC load switch for connecting a high-voltage cable, and receives a high-voltage power supply / transformation facility that receives power at a high voltage, and the high-voltage reception / transformation facility. A non-contact infrared sensor for monitoring the high-voltage cable connected to the disconnector or the high-voltage AC load switch, a control device connected to the non-contact infrared sensor, and the high voltage A fire extinguishing device that is disposed in a power receiving / transforming facility and injects a fire extinguishing agent based on a command from the control device, and the non-contact infrared sensor is connected to the disconnector or the high-voltage AC load switch detects the infrared intensity corresponding to a temperature emitted from a high voltage cable, acquires the analog current signal based on the intensity of the infrared, the control device, the analog photoelectric acquired When back-calculated values of temperature obtained from the signal is the physical properties of the high-voltage cable has reached the first threshold value with a possibility to deteriorate irreversibly, lighting command to the fire detection light of the high voltage power receiving and transforming equipment, the high electrostatic pressure receiving Output a ringing command to the buzzer of the substation equipment, a stop command to the ventilator of the high voltage receiving / transforming equipment, an input energization cutoff command to the high voltage receiving / transforming equipment, a notification command, and the control device When the back calculation value exceeds the first threshold value and reaches a second threshold value where it is assumed that a decrease in the coating thickness of the high voltage cable starts to occur significantly, the fire extinguishing agent injection command to the fire extinguishing device, the fire extinguishing device It outputs a lighting command to a fire extinguisher operating lamp that lights up when it is activated .

The invention according to claim 2 is the invention according to claim 1, further comprising a smoke sensor disposed on a ceiling side of the high voltage receiving and transforming equipment, and the smoke sensor detects a smoke detection signal when detecting smoke. The control device receives the smoke detection signal, and outputs a fire extinguishing agent injection command to the fire extinguishing device, a lighting command to the fire detection lamp of the high voltage receiving / transforming equipment, and the high voltage receiving / transforming Output a lighting command to the fire extinguishing device operation lamp in addition to a ringing command to the equipment buzzer, a stop command to the ventilator of the high-voltage power receiving / transforming facility, an input energization cutoff command to the high-voltage power receiving / transforming facility It is characterized by.

The invention according to claim 3 is the invention according to claim 1 or 2, further comprising an ultraviolet sensor disposed on a ceiling side of the high-voltage receiving and transforming equipment, and the ultraviolet sensor detects the flame and performs the control. A fire notification signal is output to the device, and the control device receives the fire notification signal and outputs a fire extinguishing agent injection command to the fire extinguishing device, and a lighting command to the fire detection lamp of the high-voltage power receiving and transforming facility, In addition to the ringing command to the buzzer of the high-voltage power receiving / transforming equipment, the stop command to the ventilation device of the high-voltage power receiving / transforming equipment, the input energization cutoff command to the high-voltage power receiving / transforming equipment, the lighting to the fire extinguishing device operation lamp A command is output .

According to the present invention, an inexpensive non-contact infrared sensor (hereinafter referred to as a thermopile IR sensor) is installed at a position where abnormal heat generation is expected to occur and temperature monitoring is performed, and it is determined that there is an abnormality at a constant temperature. It is possible to shut off the equipment power supply, cut off the heat source of the fire, and suppress the transition to the fire, so that it is possible to confirm the field without operating the fire extinguishing device in the event of an abnormality, and to report to the outside without false alarms.
In addition, according to the present invention, even after an abnormality is determined at a constant temperature, the temperature is continuously monitored after the facility power supply is shut off. It can be activated and damage to equipment can be reduced.
As described above, according to the present invention, a thermopile IR sensor automatically captures changes in measured values of temperature, quickly detects abnormalities in electrical equipment, detects heat generation in the pre-fire stage, and extinguishes when there is an abnormality. It is possible to check the site without operating the system and to notify the outside, and it is possible to perform a two-stage control of injecting a fire extinguishing device when the temperature rise continues.
According to the present invention, abnormal heat generation outside the field of view of a thermopile IR sensor can be used in combination with a smoke detector and / or a UV flame sensor to cope with any fire condition while reducing the cost of fire extinguishing equipment.

It is explanatory drawing which shows the outline | summary of the electric equipment fire suppression apparatus which concerns on 1st embodiment of this invention. It is explanatory drawing which shows the example which applied the electrical installation of FIG. 1 to four fire prevention divisions. It is explanatory drawing which shows the outline | summary of the electrical installation of FIG. It is explanatory drawing which shows the monitoring area | region of the infrared sensor of FIG. It is explanatory drawing which shows the example of the control panel of FIG. It is explanatory drawing which shows the infrared sensor of FIG. It is explanatory drawing which shows the interruption | blocking location of the electric equipment fire suppression apparatus of FIG. It is a figure which shows the operation | movement flow of FIG. It is explanatory drawing which shows the outline | summary of the electric equipment fire suppression apparatus which concerns on 2nd embodiment of this invention. It is explanatory drawing which shows an example of the smoke sensor of FIG. It is explanatory drawing which shows the example of the control panel of FIG. It is explanatory drawing which shows another example of the smoke sensor of FIG. It is a figure which shows the operation | movement flow of FIG. It is explanatory drawing which shows the outline | summary of the electric equipment fire suppression apparatus which concerns on 3rd embodiment of this invention. It is explanatory drawing which shows an example of the ultraviolet sensor of FIG. It is explanatory drawing which shows the example of the control panel of FIG. It is explanatory drawing which shows the operation | movement flow of FIG. It is explanatory drawing which shows another example of the electric equipment applied to this invention. It is explanatory drawing which shows the interruption | blocking location of the electric equipment fire suppression apparatus of FIG.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
Drawing 1 is an explanatory view showing an outline of electric equipment fire suppression device 1 concerning a first embodiment of the present invention.
The electrical equipment fire suppression device 1 according to the present embodiment is applied to a CB cubicle type power receiving equipment 10.
In the electrical equipment fire suppression device 1 according to the present embodiment, for example, as shown in FIG. In FIG. 2, a state assuming a fire in the fire prevention section 3 is shown.

  As shown in FIGS. 1 and 3, for example, the CB cubicle type power receiving equipment 10 fixes a 6,600V high voltage cable 11 introduced from the outside to an internal fixing portion 10a, and ends the three-pronged high-voltage cable. The voltage cables 11a, 11b, and 11c are connected to the primary side of the disconnector 12 that is fixed inside. Three internal high voltage cables 13a, 13b, 13c are connected to the secondary side of the disconnector 12, respectively. The three internal high-voltage cables 13a, 13b, and 13c are connected to the vacuum circuit breaker 14, respectively. Separate internal high voltage cables 15a, 15b, 15c are connected to the vacuum circuit breaker 14, respectively. Separate internal high voltage cables 15 a, 15 b, 15 c are connected to the transformer 16, respectively. In the transformer 16, the voltage is stepped down to 100V, 200V, 400V, etc., and supplied to various lamp loads and power loads.

For example, as shown in FIGS. 1 and 4, the CB cubicle type power receiving facility 10 has a thermopile so that the high voltage cables 11 a, 11 b and 11 c and the internal high voltage cables 13 a, 13 b and 13 c can be monitored. An IR sensor 20 of the type is attached. In FIG. 1, one thermopile type IR sensor 20 is shown for convenience.
In the CB cubicle type power receiving facility 10, two fire extinguishing devices 30 are provided on the ceiling side facing the monitoring areas 20 </ b> A and 20 </ b> B of the thermopile IR sensor 20.
The thermopile type IR sensor 20 and the fire extinguishing device 30 communicate with the control device 40, respectively.

For example, as shown in FIGS. 5 and 6, the control device 40 includes a PLC 41, an A / D converter 42, a manual fire extinguishing switch (not shown), a buzzer 43, an ignition relay 44, a fire detection lamp 45, and a fire extinguishing device. The operation lamp 46, the ignition power supply 47, the ventilator 17 of the electric equipment, the electric input device 18 of the electric equipment, the external alarm device 19 and the like communicate with each other.
A control device 40, a PLC 41, an A / D converter 42, a manual fire extinguishing switch (not shown), a buzzer 43, an ignition relay 44, a fire detection lamp 45, a fire extinguishing device operation lamp 46, and an ignition power supply 47 are provided in the control panel 40A. It has been. The function of the control panel 40A incorporates a PLC 41, receives a fire detection signal by program control, and issues an operation command to an external device and an ignition command of the fire extinguishing device 30.

The PLC 41 performs an operation command, indicator light control, and alarm buzzer control of the fire extinguishing device 30 based on a signal from the IR sensor 20.
The buzzer 43 generates a warning sound in response to a ringing command from the sequencer.
The indicator lamp 49 displays the operation status of the control panel 40A. In this embodiment, a “collective indicator lamp” is used. Power on, mode (inspection, monitoring), fire detection, fire extinguishing device operation, UPS abnormality display.
The A / D converter 42 converts the output data from the IR sensor 20 into an abnormality notification signal that can be used by the PLC 41. The current value input from the IR sensor 20 is converted into temperature and displayed. Two threshold temperatures can be set, and an abnormality notification signal is output to the PLC 41 when the relay contact is turned on / off.

The ignition relay 44 is installed independently for each fire extinguishing device 30, receives an ignition command from the PLC 41, turns on the contact, and operates the fire extinguishing device 30.
The ignition power supply 47 is an operating power supply for all the fire extinguishing devices 30. A sufficient capacity is set in a situation where all the fire extinguishing devices 30 are operated simultaneously.
One manual fire extinguishing switch corresponds to each fire prevention section. By turning on the switch, the manual fire extinguishing switch has the same role as the “fire detection signal” and immediately activates the external device and the fire extinguishing device.

The IR sensor 20, PLC 41, and A / D converter 42 are supplied with power from a common power supply (DC 24 V) 48.
For example, as shown in FIG. 6, when infrared light having an intensity corresponding to temperature is radiated from the monitoring regions 20 </ b> A and 20 </ b> B to be monitored, the IR sensor 20 transmits the infrared light through the filter lens 21 at the end of the IR sensor 20. Focused. At this time, unnecessary light is cut, and only infrared rays in a specific wavelength region pass through the filter lens 21.
Infrared rays are condensed on a thermopile 22 that is a detection element of the IR sensor 20. It is converted into voltage and current by the pyroelectric effect of the thermopile 22.

The voltage and current of the thermopile 22 are converted into, for example, an analog current signal of 4 to 20 mA by the internal circuit 23. At this time, the current value increases or decreases depending on the temperature of the monitoring object (infrared radiation).
The analog current signal is input to the A / D converter 42. The A / D converter 42 reversely calculates the temperature of the monitored object from the current value, and displays the measured temperature in real time on the digital temperature display section. Here, 4 mA = 0 ° C. and 20 mA = 200 ° C. are set. When the sensor wiring is disconnected, the input becomes 0 mA, so a negative measurement value is displayed on the digital display unit of the A / D converter 42. Thereby, disconnection detection is possible.

When the temperature to be monitored reaches the threshold temperature 1 set in advance on the A / D converter 42 side, the built-in output contact 1 operates. The operation of the output contact 1 is transmitted to the PLC 41. At this time, an operation command is output from the PLC 41 to a plurality of external devices by the program.
When the temperature to be monitored rises from the threshold temperature 1 and reaches the threshold temperature 2 set in advance on the A / D converter 42 side, the built-in output contact 2 operates. The operation of the output contact 2 is transmitted to the PLC 41. At this time, an operation command is output from the PLC 41 to a plurality of external devices by the program.

The monitoring part of the IR sensor 20 is a high voltage cable part. The high voltage cable coating is a resin (such as fireproof polyethylene) and is relatively flammable in the cubicle.
It is desirable to monitor a plurality of cables using a plurality of IR sensors 20.
The threshold temperatures 1 and 2 of the IR sensor 20 are set based on the maximum allowable temperature of the monitored part during cubicle operation.

Cubicle high voltage cable coatings are typically made of crosslinked polyethylene, fire resistant polyethylene and polyethylene.
In JIS C3606 “High Voltage Cross-linked Polyethylene Cable”, there are descriptions of a heat test and a heat deformation test of cross-linked polyethylene, fire-resistant polyethylene and polyethylene cable.
In the JIS C3606 heating test, after heating to 75 ° C., a decrease in tensile strength and an increase in elongation are confirmed when stress is applied to the cable.
Therefore, in this embodiment, “75 ° C.” at which the physical characteristics of the cable may be irreversibly deteriorated is set as the abnormality notification temperature “threshold temperature 1” of the IR sensor 20.

The heat deformation test of JISC3606 is a test for confirming a decrease in the thickness of the coating after heating the cable to 90 ° C. In cross-linked polyethylene, a standard is set that the rate of thickness reduction is 40% or less. At this temperature “90 ° C.” or higher, it is considered that a decrease in coating thickness due to heat begins to occur remarkably.
A decrease in the coating thickness leads to a decrease in insulation resistance, and there is a possibility of transition from dielectric breakdown → short circuit → heating → fire.
Therefore, in this embodiment, this “90 ° C.” is set as the fire alarm temperature “threshold temperature 2” of the IR sensor 20.

The above threshold temperature is a temperature in the vicinity of the cable's normal limit, and a measurement error also occurs in the IR sensor 20. In view of these, it is preferable to set a lower temperature setting.
In the present embodiment, the power supply is shut off to cut off the heat source at the time of the cubicle fire, but as shown in FIG. 7, it is implemented by sending a signal to the disconnector 12.
Depending on the type of the interrupting device, a signal is sent to a part called TC (trip coil) to operate the interrupting device.
The TC is a device for opening the LBS. Originally, the TC receives an abnormal signal from an overcurrent relay, a ground fault relay, or the like, and opens the circuit.

Although the power supply is stopped by cutting the main cutoff device, the cutoff device may be provided also in the low piezoelectric path portion downstream from the main cutoff device, and it is possible to control to cut off energization step by step from the downstream device.
Also, in the event of a fire, the ventilator (fan) 17 of the electrical equipment is stopped simultaneously with the power-off. This causes the fan switch in the cubicle to interrupt the ventilator control wiring from the fire extinguisher control panel, and in the event of a fire the ventilator 17 It is possible to prevent energization of the power.
The fire extinguishing apparatus 30 uses, for example, a pyrotechnic aerosol fire extinguishing apparatus. The pyrotechnic-type aerosol fire extinguishing device, for example, fills a pressure vessel with a fire extinguisher composed of KNO ₃ 67 to 72%, phenol formaldehyde resin 8 to 12%, DCDA (dicyandiamide) 16 to 25%, A fire extinguisher is combusted by the operation of an electric igniter, and flame suppression particles generated by the combustion are injected.

As shown in FIG. 5, the ignition circuit of the fire extinguishing device 30 uses a dedicated ignition power supply 47 separately from the control system. The ignition circuit of the fire extinguisher 30 has a restriction that the energization time is 1 second by a program.
The fire extinguishing apparatus 30 uses fire extinguishing pyrotechnics. As a feature of pyrotechnics, a large current is required to improve ignition reliability. Also, there may be residual resistance in the unit after ignition, and in some cases there is a risk of short circuit.
Based on the above, a dedicated ignition power supply 47 is used to limit the energization time.

If the operation power supply (24V power supply) 48 of the control system is used as an ignition power supply, when a fire occurs, the indicator lamp 49, the buzzer 43, and an external device are interlocked and the fire extinguishing device 30 is ignited. Become.
In this case, when power is supplied to the fire extinguishing apparatus 30, a load is applied to the power supply by flowing a large current. If the power supply becomes overcurrent, the power supply voltage drops. When the power supply voltage drops, the indicator lamp 49 of the control panel 40A and the A / D converter 42 may stop and lose their functions.

In addition, if the remaining resistance of the fire extinguishing device 30 after ignition is short-circuited, an overcurrent is supplied from the power supply, and there is a risk of overheating or fire of the power supply. After that, turn off the power.
Thus, in the ignition circuit of the fire extinguishing device 30, a large current can be supplied to the fire extinguishing device 30, and the control system is not affected. Regardless of the state of the fire extinguishing device 30 after ignition, there is an advantage that the control device and the ignition power source are not affected by the influence.

Next, the operation of this embodiment will be described.
As shown in FIG. 8, the main power supply of the control device 40 is turned on (step S1).
All the output ports of the PLC 41 are turned off (step S2).
The monitoring areas 20A and 20B of the high voltage cable are monitored by the IR sensor 20, and the monitoring temperature is input to the A / D converter 42 (steps S3 and S4).
The A / D converter 42 determines whether or not the electrical signal exceeds the threshold temperature 1 (step S5).
If the threshold temperature is 1 or less, the process returns to step S3.

When the threshold temperature 1 is exceeded, the A / D converter 42 operates the output contact 1 (step S6).
When the output contact 1 is activated, the input port X0 of the PLC 41 is turned on (step S7), and the output ports Y0, Y1, Y2, Y3, Y5 are turned on (steps S8 to S12).
Along with this, the buzzer sounds, the ventilation device is stopped, the input energization of the facility is cut off, the alarm is activated, and the fire detection lamp is turned on (steps S13 to S17).
The A / D converter 42 determines whether or not the electrical signal exceeds the threshold temperature 2 (step S18).
If it is less than the threshold temperature 2, the process returns to step S18 to continue monitoring.

When the threshold temperature 2 is exceeded, the A / D converter 42 operates the output contact 2 (step S19).
When the output contact 2 is activated, the input port X1 of the PLC 41 is turned on (step S20), and the output ports Y6 and Y4 are turned on (steps S21 and S22).
Accordingly, the fire extinguisher operation lamp is turned on (step S23), the ignition relay is turned on (step S24), and the fire extinguisher 30 is activated (step S25).
As described above, the monitoring areas 20A and 20B detected by the IR sensor 30 can be surely extinguished.

FIG. 9 is an explanatory diagram showing an outline of the electrical equipment fire suppression device 1A according to the second embodiment of the present invention.
The electrical equipment fire suppression device 1A according to the present embodiment is different from the electrical equipment fire suppression device 1 according to the first embodiment in that a scattering smoke detector 60A or a transmission smoke detector 60B is provided.
In the scattering type smoke detector 60A, as shown in FIG. 10, the light from the light emitting element 61 is scattered by the smoke, the scattered light enters the light receiving element 62, the received light signal is processed by the signal processing unit 63, and the control circuit 64 Makes a fire judgment, sounds the main body buzzer 65, issues a command to operate the contact to the external relay 66, and the operation of the contact is input to the PLC 41. When the operation of the contact is input, the PLC 41 outputs an operation command to a plurality of external devices as shown in the control panel 40A shown in FIG.

  In the transmission type smoke detector 60B, as shown in FIG. 12, the light from the light emitting element 61 is attenuated by the smoke, the light intensity incident on the light receiving element 62 is reduced, and the dimming signal is processed by the signal processing unit 63. The control circuit 64 makes a fire determination, sounds the main body buzzer 65, issues a command to operate the contact to the external relay 66, and the contact operation is input to the PLC 41. When the operation of the contact is input, the PLC 41 outputs an operation command to a plurality of external devices as shown in the control panel 40A shown in FIG.

The operation flow of this embodiment will be described with reference to FIG. For example, similarly to the operation flow shown in FIG. 8 of the first embodiment, the main power supply of the control device 40 is turned on (step S1).
All the output ports of the PLC 41 are turned off (step S2).
The inside of the fire prevention area is monitored by the smoke detector 60A via the route * 1 (step S30).
It is determined whether or not the smoke detector 60A detects smoke (step S31).
If no smoke is detected, the process returns to step S30.
The monitored object generates heat and smoke is generated due to thermal decomposition of the material. Smoke enters and fills the smoke detector 60A. When the smoke reaches a certain concentration, the light from the light emitting element 61 of the smoke detector 60A is scattered by the smoke, the scattered light enters the light receiving element 62, the received light signal is transmitted to the signal processing unit 63, and the control circuit 64 fires. A determination is made and the main body buzzer 65 is sounded.

With the fire determination of the control circuit 64, the contact of the relay 66 is operated (step S32).
When the contact of the relay 66 is activated, the input port X2 of the PLC 41 is turned on (step S33), the output ports Y0, Y1, Y2, Y3, Y4 , Y6 are turned on (step S34), the buzzer 43 sounds, and the ventilation device 17 is stopped, the input power of the facility is cut off, the ignition relay 44 is turned on, the fire extinguisher operation lamp 46 is lit, and the fire extinguisher 30 is operated via the route * 2 (step S25).
According to the present embodiment, the smoke detectors 60 </ b> A and 60 </ b> B can catch a fire outside the field of view of the IR sensor 20, and therefore, by combining with the IR sensor 20, the fire detection reliability can be improved.

FIG. 14 is an explanatory diagram showing an outline of the electrical equipment fire suppression device 1B according to the third embodiment of the present invention.
The electrical equipment fire suppression device 1B according to the present embodiment is different from the electrical equipment fire suppression device 1A according to the second embodiment in that an ultraviolet sensor (UV sensor) 70 is used instead of the smoke detectors 60A and 60B. .
As shown in FIG. 15, the UV sensor 70 includes a UV tron tube 71 that receives UV (wavelength 185 to 300 nm) emitted from a fire when a fire occurs on the monitoring target and the flame rises, and the UV tron tube 71. The incident UV generates a discharge due to the photoelectric effect in the UV tron tube 71, and the signal processing unit 72 that performs signal processing on the discharge and the contact of the relay 75 based on the signal processed by the signal processing unit 72. And a control circuit 73 for lighting the main body LED.
The operation of the contact of the relay 75 is transmitted to the PLC 41, and the PLC 41 outputs an operation command to a plurality of external devices by a program as shown in FIG.

The operation flow of this embodiment will be described with reference to FIG. For example, similarly to the operation flow shown in FIG. 8 of the first embodiment, the main power supply of the control device 40 is turned on (step S1).
All the output ports of the PLC 41 are turned off (step S2).
The inside of the fire prevention area is monitored by the ultraviolet sensor 70 via the route of * 1 (step S40).
It is determined whether or not the ultraviolet sensor 70 has detected a flame (step S41).
If no flame is detected, the process returns to step S40.
When a fire occurs in the monitoring target and the flame rises, when UV (wavelength 185 to 300 nm) emitted from the flame enters the UV tron tube 71, a discharge due to the photoelectric effect occurs in the UV tron tube 71, and the discharge is The signal processing unit 72 performs signal processing, and based on the signal processed by the signal processing unit 72, the control circuit 73 operates the contact of the relay 75 and turns on the main body LED (step S42).

When the contact of the relay 75 is activated, and the input port X2 Gao down the PLC41 (step S43), the output port Y0, Y1, Y2, Y3, Y4, Y6 is turned on (step S44), the buzzer 43 is sounded, ventilation The apparatus 17 is stopped, the input power of the facility is shut off, the ignition relay 44 is turned on, the fire extinguisher operation lamp 46 is lit, and the fire extinguisher 30 is operated via the route * 2 (step S45).
According to this embodiment, since the ultraviolet sensor 70 responds to the ultraviolet wavelength of fire, it responds instantaneously at the time of ignition and has a large visual field and monitoring distance. Therefore, it is suitable for the earth leakage spark (arc discharge) in the stage before the earth leakage fire.

In addition, although the said embodiment demonstrated the case where it applied to CB type | mold cubicle type power receiving apparatus, this invention is not restricted to this, You may apply to the PF-S type cubicle type power receiving apparatus shown in FIG. In this case, as shown in FIG. 19, the breaking position is the high voltage AC load switch 12A.
Further, in the electrical equipment fire suppression device 1A according to the second embodiment, the IR sensor 20 and the smoke detectors 60A and 60B are used together, and in the electrical equipment fire suppression device 1B according to the third embodiment, the IR sensor 20 and the ultraviolet sensor 70 However, the present invention is not limited to this, and the IR sensor 20, the smoke detectors 60A and 60B, and the ultraviolet sensor 70 may be used in combination.

1, 1A, 1B Electric equipment fire suppression device 10 CB cubicle type power receiving equipment 11 6,600V high voltage cables 11a, 11b, 11c introduced from outside High voltage cable 12 Disconnector 12A High voltage AC load switch 13a, 13b , 13c Internal high voltage cable 14 Vacuum circuit breaker 17 Electrical equipment ventilation device 18 Electrical equipment electrical input device 19 External alarm device 20 Thermopile IR sensor 20A, 20B Monitoring area 21 Filter lens 22 Thermopile 23 Internal circuit 30 Fire extinguishing device 40 control device 40A control panel 41 PLC
42 A / D converter 43 Buzzer 44 Ignition relay 45 Fire detection lamp 46 Fire extinguishing device operation lamp 47 Ignition power supply 47 Dedicated ignition power supply 48 Control system operation power supply (24V power supply)
49 Indicator lamp 60A Scattering smoke detector 60B Transmission smoke detector 61 Light emitting element 62 Light receiving element 63 Signal processing unit 64 Control circuit 66 Relay 70 UV sensor (UV sensor)
71 UVtron tube 72 Signal processor 73 Control circuit 75 Relay

Claims (3)

A high-voltage receiving / transforming facility comprising a disconnector for connecting a high-voltage cable or a cubicle equipped with a high-voltage AC load switch ;
A non-contact infrared sensor for monitoring the high voltage cable provided in the high voltage receiving and transforming equipment and connected to the disconnector or the high voltage AC load switch ;
A control device connected to the non-contact infrared sensor;
A fire extinguishing device that is disposed in the high-voltage receiving and transforming equipment and injects a fire extinguishing agent based on a command from the control device,
The non-contact infrared sensor detects an infrared ray having an intensity corresponding to a temperature radiated from the high voltage cable connected to the disconnector or the high voltage AC load switch , and an analog based on the infrared ray intensity. Get the current signal,
When the back-calculated value of the temperature obtained from the acquired analog current signal reaches a first threshold that may irreversibly deteriorate the physical characteristics of the high-voltage cable, the control device detects a fire in the high-voltage receiving / transforming equipment. Outputs a lighting command to the lamp, a ringing command to the buzzer of the high voltage receiving / transforming equipment, a stop command to the ventilator of the high voltage receiving / transforming equipment, an input energization cutoff command to the high voltage receiving / transforming equipment, and a notification command And
The control device extinguishes fire when the back-calculated value of the temperature exceeds the first threshold value and reaches a second threshold value where it is assumed that a decrease in the coating thickness of the high voltage cable starts to occur significantly. An electrical equipment fire suppression device characterized in that it outputs an agent injection command and a lighting command to a fire extinguishing device operation lamp that lights when the fire extinguishing device is activated . In the electrical equipment fire suppression device according to claim 1,
Comprising a smoke sensor arranged on the ceiling side of the high-voltage receiving and transforming equipment,
When the smoke sensor detects smoke, it outputs a smoke detection signal to the control device,
The control device receives the smoke detection signal, and outputs a fire extinguishing agent injection command to the fire extinguishing device, a lighting command to a fire detection lamp of the high voltage power receiving / transforming equipment, and a buzzer of the high voltage power receiving / transforming equipment. In addition to a ringing command, a stop command to the ventilator of the high voltage receiving / transforming equipment, an input energization cutoff command to the high voltage receiving / transforming equipment, a lighting command to the extinguishing device operation lamp is output. Electrical equipment fire suppression device. In the electrical equipment fire suppression device according to claim 1 or claim 2,
Further comprising an ultraviolet sensor disposed on the ceiling side of the high voltage receiving and transforming equipment,
When the ultraviolet sensor senses a flame, it outputs a fire notification signal to the control device,
The control device receives the fire notification signal, and outputs a fire extinguishing agent injection command to the fire extinguishing device, a lighting command to a fire detection lamp of the high voltage receiving / transforming equipment, and a buzzer of the high voltage receiving / transforming equipment In addition to a ringing command, a stop command to the ventilator of the high voltage receiving / transforming equipment, an input energization cutoff command to the high voltage receiving / transforming equipment, a lighting command to the extinguishing device operation lamp is output. Electrical equipment fire suppression device.