CN113763662A - Electrical fire monitoring system - Google Patents
Electrical fire monitoring system Download PDFInfo
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- CN113763662A CN113763662A CN202111200713.9A CN202111200713A CN113763662A CN 113763662 A CN113763662 A CN 113763662A CN 202111200713 A CN202111200713 A CN 202111200713A CN 113763662 A CN113763662 A CN 113763662A
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- Prior art keywords
- fire
- residual current
- alarm
- fire monitoring
- monitoring system
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
- G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
Abstract
The invention relates to an electrical fire monitoring system. The electrical fire monitoring system comprises an electrical fire monitoring detector, a temperature sensor and a controller, wherein the electrical fire monitoring detector comprises a residual current transformer and the temperature sensor; the electric fire monitoring equipment comprises a fire alarm controller, a transmitter, fire-fighting linkage equipment and a power supply, wherein if the residual current corresponding to the residual current information is greater than the residual current preset threshold value or the temperature corresponding to the temperature information is greater than the temperature preset threshold value, the fire alarm controller indicates an alarm part, records and stores alarm information, and controls the fire-fighting linkage equipment to send an alarm signal and execute the action of cutting off the power supply; the electrical fire monitoring equipment also comprises a current detection device for detecting the working current of the protected line; and the residual current preset threshold adjusting module is used for adjusting the residual current preset threshold according to the working current of the protected line. The electric fire monitoring system is strong in judgment capability, high in accuracy and low in false alarm rate.
Description
Technical Field
The invention relates to the field of electrical fire monitoring, in particular to an electrical fire monitoring system.
Background
The electric fire monitoring system is a system which can send out alarm signals and control signals and can indicate alarm positions when detected parameters in a protected line exceed alarm set values, and consists of electric fire monitoring equipment and an electric fire monitoring detector. Different from the traditional automatic fire alarm system, the electric fire monitoring system carries out early warning before the fire happens, so that the actual loss is avoided, and the traditional automatic fire alarm system carries out early warning after the fire happens.
When the electrical fire monitoring system consists of electrical fire monitoring equipment and a residual current type electrical fire monitoring detector, if a phase line, a neutral line and a PE line all penetrate through a current transformer, the sum of output residual current vectors is 0, the electrical fire monitoring system cannot give an alarm, the electric leakage of a power distribution system cannot be monitored, and therefore the purpose of avoiding electrical fire cannot be achieved.
Even if the wiring is proper, namely the phase line and the neutral line pass through the current transformer of the residual current type electric fire monitoring detector together, the neutral line N and the PE line are mixed and not strictly separated during the construction of the distribution line, because the civil construction distribution system is generally a TN-S grounding system or a TN-C-S grounding system, the distribution equipment can normally work, and the mixed connection of the neutral line N and the PE line of the finished distribution line is usually difficult to find. The neutral line N and the PE line are connected in a mixed mode, and the current of the neutral line N of the power distribution system is somewhat shunted by the PE line, so that the sum of residual current vectors forming output is not 0, and therefore false alarm occurs in the electrical fire monitoring system.
Disclosure of Invention
In view of the above, the present invention has been developed to provide an electrical fire monitoring system that overcomes, or at least partially solves, the above-mentioned problems.
The electrical fire monitoring system includes:
the electric fire monitoring detector is used for detecting residual current information and temperature information of a protected line and comprises a residual current transformer and a temperature sensor;
the electric fire monitoring equipment comprises a fire alarm controller, a transmitter, fire-fighting linkage equipment and a power supply, wherein the residual current transformer and a temperature sensor are connected with the fire alarm controller through the transmitter, the fire-fighting linkage equipment is connected with the fire alarm controller, and if the residual current corresponding to residual current information is greater than a preset residual current threshold value or the temperature corresponding to temperature information is greater than a preset temperature threshold value, the fire alarm controller indicates an alarm part, records and stores alarm information, and controls the fire-fighting linkage equipment to send out an alarm signal and execute the action of cutting off the power supply;
the electrical fire monitoring apparatus further comprises
The current detection device is used for detecting the working current of the protected line;
and the residual current preset threshold adjusting module is used for adjusting the residual current preset threshold according to the working current of the protected line.
Optionally, the fire alarm controller includes a residual current reminding module, and the residual current reminding module is configured to send a reminding signal when a similarity between a current residual current change and a residual current change in a same time period as a history is lower than a preset threshold value.
Optionally, the transmitter is a fieldbus type transmitter.
Optionally, the fire-fighting linkage equipment comprises an audible and visual alarm and a loudspeaker, and the audible and visual alarm and the loudspeaker are both connected with the fire alarm controller.
Optionally, the temperature sensor is a Pt100 temperature sensor.
Optionally, the fire alarm controller comprises a processing unit for processing data; the display unit is used for indicating an alarm part; and the storage unit is used for recording and storing the alarm information.
Optionally, the power supply includes a main power supply and a backup power supply, and the backup power supply is configured to supply power to the fire alarm controller, the transmitter, the fire-fighting linkage device, and the current detection device when the main power supply fails to supply power to the fire alarm controller, the transmitter, the fire-fighting linkage device, and the current detection device.
The electric fire monitoring system can reduce the false alarm rate by simultaneously detecting two parameters of residual current and temperature of a protected circuit and comprehensively analyzing the two parameters. The electric fire monitoring equipment adjusts the residual current preset threshold value according to the working current of the protected circuit, so that false alarm of the electric fire monitoring system due to the increase of the total power of the electric equipment can be avoided or reduced, electric leakage of the power distribution system cannot be monitored due to the reduction of the total power of the electric equipment, the electric fire monitoring system is higher in judgment capability, higher in accuracy and lower in false alarm rate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of an electrical fire monitoring system according to the present invention.
Description of reference numerals: 1. an electrical fire monitoring detector; 11. a residual current transformer; 12. a temperature sensor; 2. an electrical fire monitoring device; 21. a fire alarm controller; 22. a transmitter; 23. a fire-fighting linkage device; 24. a power source; 25. a current detection device; 26. a residual current preset threshold value adjusting module; 27. and a residual current reminding module.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below are exemplary embodiments for explaining the present invention with reference to the drawings and should not be construed as limiting the present invention, and those skilled in the art can make various changes, modifications, substitutions and alterations to the embodiments without departing from the principle and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. Furthermore, the terms "comprises," "comprising," and any variations thereof, are intended to cover non-exclusive inclusions.
An electrical fire monitoring system according to an embodiment of the present invention is described below with reference to the accompanying drawings.
Referring to fig. 1, an electrical fire monitoring system according to an embodiment of the present invention can send out an alarm signal, a control signal and can indicate an alarm portion when a detected residual current in a protected line is greater than a residual current preset threshold or a detected temperature in the protected line is greater than a temperature preset threshold. The residual current and temperature parameters of the protected circuit are detected simultaneously, and the two parameters are synthesized to carry out comprehensive analysis, so that the false alarm rate can be reduced.
The electrical fire monitoring system comprises an electrical fire monitoring detector 1 and electrical fire monitoring equipment 2. The electrical fire monitoring detector 1 is used for detecting residual current information and temperature information of a protected line, and comprises a residual current transformer 11 and a temperature sensor 12.
In an application mode, the residual current transformer 11 may be installed at an incoming line end of a main switch of the distribution box, and of course, a residual current type electrical fire monitoring detector including the residual current transformer 11 may also be directly adopted to detect the residual current of the protected line.
The temperature sensor 12 may be attached to a terminal of a second switch of the power distribution system, or may be attached to a terminal of a first switch when a distance between the first switch and the second switch of the power distribution system is short.
The temperature sensor 12 may be a Pt100 temperature sensor or other suitable temperature sensor.
The temperature can be detected directly by a temperature-measuring type electrical fire monitoring detector including the temperature sensor 12 at the cable joint, the terminal, the key heating component, and the like.
The electrical fire monitoring device 2 is used for receiving residual current information and temperature information of a protected circuit detected by the electrical fire monitoring detector 1, and if the residual current corresponding to the residual current information is larger than a residual current preset threshold value or the temperature corresponding to the temperature information is larger than a temperature preset threshold value, sending an alarm signal, indicating an alarm part, recording and storing alarm information, and executing an action of cutting off a power supply.
Specifically, electrical fire supervisory equipment 2 includes fire alarm control ware 21, changer 22, fire control aggregate unit 23, power 24, residual current transformer 11, temperature sensor 12 are connected with fire alarm control ware 21 through changer 22, fire control aggregate unit 23 is connected with fire alarm control ware 21, if the residual current that residual current information corresponds is greater than residual current preset threshold value, or the temperature that temperature information corresponds is greater than temperature preset threshold value, fire alarm control ware 21 then instructs the warning position, record and preserves alarm information to and control fire control aggregate unit 23 and send alarm signal, carry out the action of cutting off power supply, thereby can realize just carrying out the early warning before the conflagration takes place, avoid actual loss.
In one embodiment, the fire alarm controller 21 includes:
and the processing unit is used for processing the data, for example, judging whether the residual current corresponding to the residual current information is greater than a preset residual current threshold value or not, judging whether the temperature corresponding to the temperature information is greater than a preset temperature threshold value or not, and if the residual current corresponding to the residual current information is greater than the preset residual current threshold value or the temperature corresponding to the temperature information is greater than the preset temperature threshold value, sending alarm information and a control signal. The processing unit can be a single chip microcomputer, a CPU and the like.
And the display unit is used for indicating the alarm part. The display unit may be a 7 inch TFT color liquid crystal display.
And the storage unit is used for recording and storing the alarm information. The storage unit can be a memory which can store more than or equal to 500 alarm storage records and more than or equal to 500 fault storage records.
The transmitter 22 may be a fieldbus type transmitter.
Fire control aggregate unit 23 can include audible-visual annunciator, speaker, audible-visual annunciator, speaker all are connected with fire alarm controller 21, audible-visual annunciator connects the control signal who sends according to fire alarm controller 21 and sends alarm signal, the speaker carries out the on-the-spot broadcast according to the control signal that fire alarm controller 21 sent, fire control aggregate unit 23 still includes the device that can carry out the action of cutting off power supply, and the device carries out the action of cutting off power supply according to the control signal execution that fire alarm controller 21 sent.
The power supply 24 includes a main power supply and a backup power supply, and the backup power supply is used for supplying power to the fire alarm controller 21, the transmitter 22 and the fire-fighting linkage device 23 when the main power supply cannot supply power to the fire alarm controller 21, the transmitter 22 and the fire-fighting linkage device 23.
The electrical fire monitoring apparatus 2 further comprises:
and a current detection device 25 for detecting the working current of the protected line.
And the residual current preset threshold adjusting module 26 is used for adjusting the residual current preset threshold according to the working current of the protected line.
The working current of the protected line is increased along with the increase of the total power of the electric equipment, and meanwhile, the residual current value of the protected line is also increased; on the contrary, the working current of the protected line is reduced along with the reduction of the total power of the electric equipment, and meanwhile, the residual current value of the protected line is also reduced, so that the residual current preset threshold value is adjusted according to the working current of the protected line, false alarm of the electric fire monitoring system caused by the increase of the total power of the electric equipment can be avoided or reduced, electric leakage of the power distribution system cannot be monitored due to the reduction of the total power of the electric equipment, and the electric fire monitoring system is higher in judgment capability, higher in accuracy and lower in false alarm rate.
Specifically, the current detection device 25 detects the working current of the protected line, and sends the working current information to the residual current preset threshold adjustment module 26. If the working current corresponding to the working current information is increased to some extent relative to the working current in the previous time period, the residual current preset threshold value adjusting module 26 correspondingly increases the residual current preset threshold value according to the change value of the working current, and if the working current corresponding to the working current information is decreased to some extent relative to the working current in the previous time period, the residual current preset threshold value adjusting module 26 correspondingly decreases the residual current preset threshold value according to the change value of the working current. The time period may be 1 hour, 2 hours, or other suitable period, and the specific value of the time period is not limited in this embodiment.
The residual current preset threshold value adjusting module 26 may be built in the fire alarm controller 21 as a part thereof, in this case, the current detecting device 25 may be connected to the residual current preset threshold value adjusting module 26 via the transmitter 22, and the standby power supply may be further configured to supply power to the current detecting device 25 when the main power supply cannot supply power to the current detecting device 25.
The residual current preset threshold value adjusting module 26 may also be independent of the fire alarm controller 21, in this case, the current detecting device 25 may be directly connected to the residual current preset threshold value adjusting module 26, or connected to the residual current preset threshold value adjusting module 26 via the transmitter 22, and the residual current preset threshold value adjusting module 26 is connected to the fire alarm controller 21, and the backup power supply may also be configured to supply power to the current detecting device 25 and the residual current preset threshold value adjusting module 26 when the main power supply cannot supply power to the current detecting device 25 and the residual current preset threshold value adjusting module 26.
In one embodiment, the fire alarm controller 21 includes a residual current reminding module 27, and the residual current reminding module 27 is configured to send out a reminding signal when the similarity between the current residual current change and the residual current change in the same time period as the history is lower than a preset threshold value.
And recording the residual current, and if the current residual current change rule is the same as or basically the same as the residual current change rule in the same historical time period, judging the residual current to be normal. If the current change rule of the residual current is different from the change rule of the residual current in the same time period in the history and the difference is very different, the residual current reminding module 27 sends out a reminding signal, and a worker checks whether the change of the residual current is caused by the change of the load in the power supply system so as to judge whether the fault occurs.
For example, with a year as a period, the residual current values in different seasons are recorded in the first year, and compared in the next period, that is, the next year, if the change rule of the residual current in a certain season (for example, winter) in the next year is different from the change rule of the residual current in the same season (for example, winter) in the first year, and the difference is very different, the residual current reminding module 27 sends out a reminding signal, and a worker checks whether the change of the residual current is caused by the change of the load in the power supply system, so as to determine whether a fault occurs. Of course, a day may be used as the period, a month may be used as the period, and the period is not particularly limited in this embodiment.
In this embodiment, the electrical fire monitoring system can reduce the false alarm rate by detecting two parameters, namely the residual current and the temperature of the protected line at the same time and comprehensively analyzing the two parameters. The electric fire monitoring equipment 2 adjusts the residual current preset threshold value according to the working current of the protected circuit, can avoid or reduce the false alarm of the electric fire monitoring system caused by the increase of the total power of the electric equipment, and can not monitor the electric leakage of the power distribution system caused by the reduction of the total power of the electric equipment, so that the electric fire monitoring system has stronger judgment capability, higher accuracy and lower false alarm rate.
Claims (7)
1. An electrical fire monitoring system, comprising:
the electric fire monitoring detector is used for detecting residual current information and temperature information of a protected line and comprises a residual current transformer and a temperature sensor;
the electric fire monitoring equipment comprises a fire alarm controller, a transmitter, fire-fighting linkage equipment and a power supply, wherein the residual current transformer and a temperature sensor are connected with the fire alarm controller through the transmitter, the fire-fighting linkage equipment is connected with the fire alarm controller, and if the residual current corresponding to residual current information is greater than a preset residual current threshold value or the temperature corresponding to temperature information is greater than a preset temperature threshold value, the fire alarm controller indicates an alarm part, records and stores alarm information, and controls the fire-fighting linkage equipment to send out an alarm signal and execute the action of cutting off the power supply;
the electrical fire monitoring apparatus further comprises
The current detection device is used for detecting the working current of the protected line;
and the residual current preset threshold adjusting module is used for adjusting the residual current preset threshold according to the working current of the protected line.
2. An electrical fire monitoring system according to claim 1, wherein: the fire alarm controller comprises a residual current reminding module, and the residual current reminding module is used for sending a reminding signal when the similarity of the current residual current change and the residual current change in the same time period as the history is lower than a preset threshold value.
3. An electrical fire monitoring system according to claim 1, wherein: the transmitter is a field bus type transmitter.
4. An electrical fire monitoring system according to claim 1, wherein: the fire-fighting linkage equipment comprises an audible and visual alarm and a loudspeaker, and the audible and visual alarm and the loudspeaker are both connected with the fire alarm controller.
5. An electrical fire monitoring system according to claim 1, wherein: the temperature sensor is a Pt100 temperature sensor.
6. An electrical fire monitoring system according to claim 1, wherein: the fire alarm controller comprises a processing unit for processing data; the display unit is used for indicating an alarm part; and the storage unit is used for recording and storing the alarm information.
7. An electrical fire monitoring system according to any one of claims 1 to 6, wherein: the power supply comprises a main power supply and a standby power supply, and the standby power supply is used for supplying power to the fire alarm controller, the transmitter, the fire-fighting linkage equipment and the current detection device when the main power supply cannot supply power to the fire alarm controller, the transmitter, the fire-fighting linkage equipment and the current detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111200713.9A CN113763662A (en) | 2021-10-13 | 2021-10-13 | Electrical fire monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111200713.9A CN113763662A (en) | 2021-10-13 | 2021-10-13 | Electrical fire monitoring system |
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| CN113763662A true CN113763662A (en) | 2021-12-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114664045A (en) * | 2022-03-22 | 2022-06-24 | 三一重机有限公司 | Fireproof alarm method, device and system for excavator |
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