KR101264265B1 - P type fire alarm control panel system with signal line error resilience - Google Patents

Abstract

P-type fire alarm receiver according to an embodiment of the present invention is a line interface, the signal line of the signal line to generate a detection signal which is inactivated to a normal state or activated in an alarm state according to the degree of change in the voltage level of the signal line to which a plurality of detectors or transmitters are connected It is possible to diagnose the state of the signal line according to the result of the statistical analysis of the line state measuring unit for generating a state signal having a voltage value, a current value or information proportional thereto, and the measurements of sampled state signals while the sensing signal is inactive. It may include a diagnostic unit.

Description

P-type fire alarm receiver system flexible to fire-detection faults {P TYPE FIRE ALARM CONTROL PANEL SYSTEM WITH SIGNAL LINE ERROR RESILIENCE}

The present invention relates to fire monitoring, and more particularly, to a P-type receiver.

The National Fire Safety Standards (NFSC) is a set of regulations that set fire safety standards. Among them, the fire safety standards of the NFSC 203 automated fire detection system specify the conditions that must be provided by the building's automated fire detection system.

According to NFSC 203, a detector is a device that can automatically detect a fire and send an alarm to a receiver, and a sender is a device for notifying a person when a fire is directly detected. Among the various transmitters, the P-type Class 1 transmitter has a response lamp to confirm that a person has sent it, and has a telephone function to allow communication between the receiver and the transmitter. The P-type Class 2 transmitter has a push button but no telephone function. . There are five types of receivers: P type, R type, M type, GP type and GR type, among which P type receiver receives signals from detectors or transmitters as a common signal either directly or through a repeater and alarms. Receiver. Signal lines from any one surveillance zone are connected from detectors and transmitters to P-type receivers. A large number of monitoring zones require a large number of signal lines, but they are widely used in small buildings because of their simple and inexpensive wiring.

Conventionally, the P-type fire alarm receiver applies a DC 24 V voltage to a signal line in which a plurality of detectors or transmitters are arranged in parallel. By detecting the voltage drop of the signal line generated when short-circuited by a switch-pressing operation, the fire is generated in the zone where the signal line is arranged.

Under normal circumstances, a constant voltage must be maintained on the signal line connected to a conventional P-type fire alarm receiver. However, after a long period of several years to several decades, unless there is a fire after installation, deterioration of insulation characteristics may occur due to deterioration due to corrosion, denaturation or moisture, surge, lightning, etc. A phenomenon such as voltage induction by a commercial AC power line or a telephone line using a direct current 48V may cause a momentary voltage drop on the signal line itself, which usually leads to a false alarm.

Indeed, in many buildings, false alarms are observed due to line aging or voltage induction, and many landlords make the wrong choice to turn off the fire alarm system instead of replacing signal lines and eliminating the cause.

The problem to be solved by the present invention is to provide a P-type fire alarm receiver that can withstand the error of the fire detection line and can flexibly cope with false alarms.

P-type receiver according to an aspect of the present invention,

A line interface for generating a detection signal in which a plurality of detectors or transmitters are activated to a normal state or to an alarm state according to a degree of change of a voltage level of a signal line to which the plurality of detectors or transmitters are connected;

A line state measuring unit configured to generate a state signal having a voltage value, a current value, or information proportional to the signal line; And

The diagnosis unit may include a diagnosis unit for diagnosing the state of the signal line according to a statistical analysis result of the measurement values of the state signals sampled while the detection signal is inactivated.

According to an exemplary embodiment, the diagnostic unit may include t = 0 days within a predicted state range or a trend and a predetermined normal range of the state signal according to a statistical analysis result of the measurements sampled N times before t = 0 with respect to the state signal. If there is a sampled measurement of the state signal at the time, the signal line can be operated to determine that it is normal.

According to one embodiment, the P-type receiver,

The apparatus may further include a false alarm determining unit configured to determine whether the sense signal is false alarm by comparing the state signal sampled while the sensing signal is activated to a predetermined alarm threshold voltage.

According to an embodiment, the alarm threshold voltage may be determined according to a statistical analysis result of survey values regarding the state signal.

P-type receiver system according to another aspect of the present invention,

A signal line with detectors or transmitters connected in parallel; And

Generate a detection signal deactivated to a normal state or activated to an alarm state according to the degree of change of the voltage level of the signal line, generate a state signal having a voltage value, a current value, or information proportional to the signal line; It may include a P-type receiver for diagnosing the state of the signal line in accordance with the results of the statistical analysis of the measurements of the sampled state signal while the signal is deactivated.

Signal line detection method of the P-type receiver system according to an aspect of the present invention,

Generating a sensing signal at the P-type receiver such that the detectors or transmitters are deactivated to a normal state or activated to an alarm state according to the degree of voltage level variation of signal lines connected in parallel;

Generating, by the P-type receiver, a status signal having a voltage value, a current value, or information proportional to the signal line; And

In the P-type receiver, the method may include diagnosing a state of the signal line according to a statistical analysis result of measurements obtained by sampling the state signal while the sensing signal is inactivated.

According to one embodiment, diagnosing the state of the signal line,

The sampled measurement of the state signal when t = 0 within a predetermined normal range and the predicted state range or tendency of the state signal according to the statistical analysis of the measurements sampled N times before t = 0 with respect to the state signal If yes, it may include determining that the signal line is normal.

According to one embodiment, the signal line monitoring method of the P-type receiver system,

The method may further include determining whether the detection signal is false alarm by comparing the state signal sampled while the detection signal is activated to a predetermined alarm threshold voltage.

According to an embodiment, the alarm threshold voltage may be determined according to a statistical analysis result of survey values regarding the state signal.

According to the P-type fire alarm receiver system of the present invention, it is possible to measure the usual voltage drop level that reflects long-term line aging. The building manager may refer to these dropped voltage levels to replace the line, or adjust the threshold voltage level to be determined as a fire alarm based on the degree of voltage drop as usual.

In addition, according to the P-type fire alarm receiver system of the present invention, it is possible to maintain different fire alarm threshold voltage level for each of the plurality of sensing lines.

Furthermore, according to the P-type fire alarm receiver system of the present invention, when a false alarm occurs due to the instantaneous voltage drop due to noise or voltage induction, the false alarm can be filtered instead of an immediate alarm.

1 and 2 are conceptual views illustrating a P-type receiver system that is robust to errors in a fire detection line and flexible to false alarms according to an embodiment of the present invention.
3 is a flowchart illustrating a procedure for monitoring a voltage or current state of a fire detection line for a long time in a P-type receiver system according to an embodiment of the present invention.

For the embodiments of the invention disclosed herein, specific structural and functional descriptions are set forth for the purpose of describing an embodiment of the invention only, and it is to be understood that the embodiments of the invention may be practiced in various forms, The present invention should not be construed as limited to the embodiments described in Figs.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

1 and 2 are conceptual views illustrating a P-type receiver system that is robust to errors in a fire detection line and flexible to false alarms according to an embodiment of the present invention.

1 and 2 together, the P-type fire alarm receiver system 10 includes a plurality of monitoring zones 11 in which a plurality of detectors 111 or a transmitter 112 are connected in parallel to a signal line 113, and It may include a P-type fire alarm receiver 12 for monitoring the alarm signal of the signal lines 113 of.

Briefly describing the wiring of the signal line 113 for the reception of the fire alarm, the detector 111 and the transmitter 112 are connected in parallel to the signal line 113 terminated by the terminating resistor 114, the signal line ( 113, it is designed such that a predetermined direct current voltage, for example a direct current 24 V voltage according to the relevant regulations, is applied from the P-type fire alarm receiver 12 or from another power supply.

The detector 111 is generally designed such that the internal resistance is rapidly lowered or short-circuited when heat or smoke caused by a fire is applied to a predetermined level or more, and the transmitter 112 is closed by an external force pressed by a person who finds the fire. The internal resistance is lowered and the alarm signal is designed to be generated by the variation of the voltage level accordingly.

A typical P-type fire alarm receiver monitors the level of the DC voltage applied to the signal line 113, and when the internal resistance of the detector 111 or the transmitter 112 suddenly drops, the DC resistance depends on the equivalent resistance of the signal line 113. Alarms can be triggered by detecting voltage changes that fall from 24V to around 5V.

However, a large number of monitoring zones 11, detectors 111, transmitters 112, and terminating resistors 114 installed in each are connected to a plurality of signal lines 113, and various electrical appliances installed in a building. Since cables used by communication facilities are often installed side by side with the signal line 113, the conventional P-type fire alarm receiver may have a problem in connection status due to the aging of detectors, transmitters, and termination resistors. In some cases, even in a weak surge, the DC voltage appearing on the signal line 113 may instantaneously lower the threshold voltage set in the sensing circuit inside the line interface 121 to generate a fire alarm.

2, the P-type fire alarm receiver 12 according to the embodiments of the present invention may include a line interface 121, a line state measuring unit 122a and 122b, a diagnosis unit 123, and a false alarm determining unit ( 124, a controller 125, and a power supply unit 126.

The line interface 121 applies a 24V DC voltage supplied from the power supply unit 126 to the signal line 113, and detects a change in the voltage level of the signal line 113 by the sensing circuit to generate the detection signal S1. At this time, the detection signal S1 may be a measurement of the signal line voltage level, but is preferably activated to have a value of 0 or 1 meaning normal or alarm depending on a result of comparing the signal line voltage level with a predetermined alarm threshold voltage level. It may be a digital signal. According to an exemplary embodiment, the sensing signal S1 may be a signal before determining whether the voltage change of the signal line 113 is caused by a fire alarm or by a surge or voltage disturbance.

The line state measuring units 122a and 122b continuously or intermittently or periodically measure the voltage or current of the signal line 113 separately from the line interface 121 and measure the measured voltage or current value. (At 122b), or a status signal S2 having information proportional thereto is output in an analog form or a digital form.

In one embodiment, the line state measuring unit 122a, 122b includes an analog-to-digital conversion circuit therein to digitally measure the voltage level or the current level of the signal line 113 and the state signal S2 in digital form. To create.

In this case, the line state measuring units 122a and 122b may further include an analog multiplexer MUX and may be sequentially connected to each of the plurality of signal lines 113 through the analog MUX. Each of the plurality of signal lines 113 may be sequentially generated by measuring the voltage level or the current level of each of the plurality of signal lines 113.

In another embodiment, the line state measuring units 122a and 122b generate an analog state signal S2 proportional to the voltage level or the current level of the signal line 113, and the analog state signal S2 is generated. It may be applied to an analog-to-digital conversion circuit built in or separately provided in the controller 125 to be converted into a digital form and subsequently processed digitally.

The diagnosis unit 123 may diagnose the state of the signal line 113 based on the detection signal S1 provided by the line interface 121 and the state signal S2 provided by the line state measuring units 122a and 122b. have.

The operation of the diagnosis unit 123 may be performed while the detection signal S1 provided by the line interface 121 maintains a non-alarm state.

In detail, the diagnostic unit 123 samples the state signal S2 provided by the line state measuring units 122a and 122b at a relatively long time period and a long period, for example, every hour for a period of several days, and thus the state signal S2. Can be obtained, the statistical characteristics can be analyzed based on the measured values, and the estimated state range or future trend of the signal line voltage level or current level can be estimated according to the statistical characteristic analysis. The statistical characterization herein may include, for example, conventional statistical analysis techniques such as evaluation of the mean, variance, deviation of the signal line voltage or current levels to their temporal change, trend, and the like.

In addition, the diagnosis unit 123 may determine the alarm threshold voltage based on the measured values. For example, if the average value of the signal line voltage level is about 20V, the alarm threshold voltage may be determined at about 4V.

Meanwhile, the obtained measurements may be stored in a first-in first-out (FIFO) status signal storage.

The diagnosis unit 123 may predict the range or the trend of the predicted state signal S2 newly acquired at t = 0 according to the statistical characteristic analysis of the N state signals S2 previously acquired, for example, before t = 0. The signal line 113 may be determined to be normal if it is within an average value of the N state signals S2 and a predetermined normal range, for example, 20 to 24V, and if not, the signal line 113 may be determined to be abnormal. . If, for example, the newly acquired state signal S2 is out of the average value of the previous N state signals S2 or the predetermined normal range, it is determined that the state of the signal line 113 is abnormal. 123 may indicate to the manager that the signal line 113 is abnormal.

After determining whether the signal line 113 is normal, the state signal storage space is updated with the state signal S2 of t = 0. In this case, the first-in, first-out state signal storage deletes the state signal measurement previously recorded and adds the newly acquired state signal measurement of t = 0.

When the signal line 113 is determined to be in an abnormal state when t = 0, for example, moisture has flowed into the cable of the signal line 113, a surge occurs in a separate power source introduced into the signal line, or the signal line 113 The noise may be induced in the power cable installed adjacent to the cable, or the wiring may be defective, or the detector 111 may be defective. In this case, the diagnosis unit 123 may notify the manager that the signal line 113 is abnormal.

On the other hand, when the detection signal S1 fluctuates to an alarm state, whether a false alarm or a real fire alarm, the false alarm determination unit 124 determines whether the detection signal S1 is a false alarm or an actual fire alarm with respect to the corresponding signal line 113. Further determination may be made based on the state signal S2 provided by the line state measuring units 122a and 122b.

Specifically, the false alarm determining unit 124 acquires the state signal S2 for a relatively short time and period after the detection signal S1 changes to the alarm state, and the state signals S2 before t = 0. The newly obtained state signals S2 are compared for a predetermined time to the alarm threshold voltage determined by the diagnosis unit 123 based on the reference).

If the detection signal S1 is changed to the alarm state due to a change in the internal resistance of the detector 111 or the transmitter 112 due to the actual fire, the status signal S2 continues to be alarmed for a predetermined time or more while newly acquired. The voltage level will be lower than the threshold voltage, and in this case, the false alarm determining unit 124 determines the detection signal S1 as the actual alarm.

On the contrary, if the detection signal S1 is changed to the alarm state by the momentary voltage change, the status signal S2 will return to the voltage level higher than the alarm threshold voltage within a predetermined time immediately during the new acquisition, in this case The false alarm determining unit 124 determines the detection signal S1 as a false alarm.

The controller 125 may control operations of the diagnosis unit 123 and the false alarm determination unit 124 and operations of other components, and store and manage data generated in connection with the diagnosis of the signal line 113.

The controller 125 may display the state of the signal line on the display according to the diagnosis result of the signal line 113 of the diagnosis unit 123 or notify the remote administrator of the diagnosis result through wired or wireless communication means.

In addition, the control unit 125 may warn the occurrence of a fire in a building through an alarm siren or a broadcast according to the determination result of the false alarm determination unit 124, and operate a wired / wireless communication unit to notify the remote manager of the fire or You can report it to the authorities.

3 is a flowchart illustrating a procedure for monitoring a voltage or current state of a fire detection line for a long time in a P-type fire alarm receiver system according to an embodiment of the present invention.

Referring to FIG. 3, in step S31, the line interface 121 applies a 24V DC voltage supplied from the power supply unit 126 to the signal line 113, and sets a voltage level of the signal line 113 to a predetermined alarm threshold. The sensing signal S1 is activated in comparison with the voltage. While the detection signal S1 is inactive, the process proceeds to step S32, and when the detection signal S1 is activated in an alarm state, the process proceeds to step S36.

In step S32, the line state measuring units 122a and 122b measure the voltage or current of the signal line 113 continuously or intermittently, regularly or often, and have information on the measured voltage or current values. Output the signal S2 in analog form or digital form.

The status signal S2 in analog form may be ultimately processed by the diagnostic unit 123 or the false alarm determination unit 124 after being converted into digital form by an analog-digital converter built in or separately provided in the controller 125. have.

In step S33, the diagnostic unit 123 samples the state signal S2 provided by the line state measuring unit 122 in a relatively long period and a long period, and measures the N times state signal S2 before t = 0. , The statistical characteristics are analyzed based on the measurements, and the estimated state range or future trend of the signal line voltage level is estimated according to the statistical characteristic analysis. In addition, the diagnosis unit 123 may determine the alarm threshold voltage based on the measured values.

In step S34, if the measurement value of the state signal S2 newly acquired at t = 0 is within the predicted state range or trend and the predetermined normal range previously estimated by the diagnosis unit 123, the signal line 113 is normal. Otherwise, it is determined to be abnormal.

In step S35, the state signal storage space is updated with the state signal S2 of t = 0.

In step S36, when the detection signal S1 changes to the alarm state, the false alarm determination unit 124 determines whether the detection signal S1 is a false alarm or an actual fire alarm with respect to the corresponding signal line 113. Further determination may be made based on the state signal S2 provided by the measuring units 122a and 122b.

Specifically, measurements of the state signal S2 sampled during the previous normal state while acquiring measurements of the state signal S2 in a relatively short time and period after the detection signal S1 has changed to the alarm state. The measured values of the newly acquired status signal S2 are compared for a predetermined time to the alarm threshold voltage determined by the diagnosis unit 123 or based on the predetermined threshold.

Further, in step S36, the false alarm determining unit 124 determines that the detection signal S1 is an actual fire alarm if the state signal S2 is kept lower than the alarm threshold voltage for longer than a predetermined time, and conversely, the state signal S2. ) Returns to a voltage level higher than the alarm threshold voltage within a predetermined time, and determines the detection signal S1 as a false alarm.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art. Modifications are possible. Accordingly, the spirit of the invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications will fall within the scope of the invention.

10 P type fire alarm receiver system
11 guard zone 111 detector
112 Transmitter 113 Signal Line
114 terminating resistor
12 Type P Fire Alarm Receiver 121 Line Interface
122 Line status measurement section 123 Diagnostic section
124 false alarm judgment unit 125 control unit
126 Power Supply

Claims (9)

A line interface for generating a detection signal in which a plurality of detectors or transmitters are activated to a normal state or to an alarm state according to a degree of change of a voltage level of a signal line to which the plurality of detectors or transmitters are connected;
A line state measuring unit configured to generate a state signal having a voltage value, a current value, or information proportional to the signal line; And
And a diagnosis unit for diagnosing a state of the signal line according to a result of statistical analysis of measurements of the state signals sampled while the detection signal is inactivated. The method according to claim 1, wherein the diagnostic unit, when t = 0 in the predicted state range and the trend and the predetermined normal range of the state signal according to the statistical analysis results of the measurements sampled N times before t = 0 with respect to the state signal And if there is a sampled measurement of the state signal of P-type fire alarm receiver. The method according to claim 1,
And a false alarm determining unit which determines whether or not the detection signal is false alarm by comparing the state signal sampled while the detection signal is activated to a predetermined alarm threshold voltage. The method according to claim 3,
And the alarm threshold voltage is determined according to a statistical analysis of the survey values related to the status signal. A signal line with detectors or transmitters connected in parallel; And
Generate a detection signal deactivated to a normal state or activated to an alarm state according to the degree of change of the voltage level of the signal line, generate a state signal having a voltage value, a current value, or information proportional to the signal line; And a P-type fire alarm receiver for diagnosing a state of the signal line according to a statistical analysis result of the measurements sampled of the state signal while the signal is inactivated. Generating a detection signal at the P-type fire alarm receiver such that the detectors or transmitters are deactivated to a normal state or activated to an alarm state according to the degree of voltage level variation of signal lines connected in parallel;
Generating, by the P-type fire alarm receiver, a status signal having a voltage value, a current value, or information proportional to the signal line; And
Diagnosing the state of the signal line in the P-type fire alarm receiver according to a statistical analysis result of the measurements sampled of the state signal while the detection signal is inactivated. The method of claim 6, wherein diagnosing the state of the signal line comprises:
The sampled measurement of the state signal when t = 0 within a predetermined normal range and the predicted state range or tendency of the state signal according to the statistical analysis of the measurements sampled N times before t = 0 with respect to the state signal Determining if the signal line is normal, if any. 8. The P-type fire alarm receiver system according to claim 7, further comprising the step of determining whether the detection signal is false alarm by comparing the state signal sampled while the detection signal is activated to a predetermined alarm threshold voltage. Signal line monitoring method. The signal line monitoring method according to claim 6, wherein the alarm threshold voltage is determined according to a statistical analysis result of the survey values related to the status signal.

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