CN118131080A - Lighting broken wire positioning alarm receiver and lighting system - Google Patents
Lighting broken wire positioning alarm receiver and lighting system Download PDFInfo
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- CN118131080A CN118131080A CN202410533348.0A CN202410533348A CN118131080A CN 118131080 A CN118131080 A CN 118131080A CN 202410533348 A CN202410533348 A CN 202410533348A CN 118131080 A CN118131080 A CN 118131080A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/44—Testing lamps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2611—Measuring inductance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a lighting broken wire positioning alarm receiver and a lighting system, wherein the receiver comprises a control module, a lamp position acquisition circuit, a voltage acquisition circuit, a current acquisition circuit, a voltage square wave operation circuit and a current square wave operation circuit; the lamp position acquisition circuit is connected with the lighting circuit through a mutual inductor; the voltage acquisition circuit and the current acquisition circuit are connected between the lighting power supply and the lighting circuit; the control module is used for executing the following steps: acquiring first lamp position information reported by a lamp position acquisition circuit, a voltage square wave of a voltage square wave operation circuit and a current square wave of a current square wave operation circuit; determining second lamp position information according to the voltage square wave and the current square wave; and determining alarm information according to the first lamp position information and the second lamp position information. The second lamp position information is determined by collecting the voltage and the current of the lamp circuit and is checked with the first lamp position information of the lamp position collecting circuit, so that the accuracy of lamp position monitoring is improved.
Description
Technical Field
The invention belongs to the technical field of railway safety monitoring, and particularly relates to a lighting broken wire positioning alarm receiver and a lighting system.
Background
The railway signal lamp is the safety guarantee of train operation, in order to ensure the safe operation of train, the state of railway signal lamp needs real-time supervision. The existing railway signal is safe and reliable, the bulb of the signal machine is a double-filament, the normal lighting is a main filament, the auxiliary filament is automatically changed to be lighted after the main filament is broken, and meanwhile, a main filament broken filament alarm system is started, so that the bulb can be replaced in time, and the unsafe condition of lamp extinction is avoided.
The traditional lighting unit alarm is realized by adopting an 850 alarm relay, and the alarm mode has low response speed, inaccurate lamp position positioning and incapability of carrying data information, can only be used as a state judgment, and can not meet the state monitoring requirement in a new form.
Disclosure of Invention
In view of the above, the invention provides a lighting broken wire positioning alarm receiver and a lighting system, which aim to solve the problem of inaccurate positioning of a lamp position in the prior art.
A first aspect of the embodiment of the invention provides a lighting broken wire positioning alarm receiver, which is connected with a signal machine; at least one lighting circuit is arranged in the annunciator; the lighting circuit is powered by a lighting power supply; the receiver includes: the device comprises a control module, a lamp position acquisition circuit, a voltage acquisition circuit, a current acquisition circuit, a voltage square wave operation circuit and a current square wave operation circuit;
The lamp position acquisition circuit is connected with the lighting circuit through a mutual inductor;
The voltage acquisition circuit and the current acquisition circuit are connected between the lighting power supply and the lighting circuit;
the voltage acquisition circuit is connected with the voltage square wave operation circuit; the current acquisition circuit is connected with the current square wave operation circuit;
the lamp position acquisition circuit, the voltage square wave operation circuit and the current square wave operation circuit are all connected with the control module;
The control module is used for executing the following steps:
Acquiring first lamp position information reported by a lamp position acquisition circuit, a voltage square wave of a voltage square wave operation circuit and a current square wave of a current square wave operation circuit;
Determining second lamp position information according to the voltage square wave and the current square wave;
And determining alarm information according to the first lamp position information and the second lamp position information.
In some possible implementations, the control module is to:
Calculating a first phase difference of a voltage square wave of the voltage square wave operation circuit and a current square wave of the current square wave operation circuit in real time;
calculating a difference value between a first phase difference of a period previous to the current period and a first phase difference of the current period;
and determining second lamp position information according to the difference value.
In some possible implementations, the coil inductances of the filament switching relays in the respective lighting circuits are the same; the inductances of the primary coils of the mutual inductors corresponding to the lighting circuits are different, and the inductances of any primary coil are smaller than or larger than the coil inductances of the filament conversion relay; the control module is used for:
Calculating an equivalent inductance according to the difference value;
And determining second lamp position information according to the equivalent inductance.
In some possible implementations, the control module is to:
when the first light position information and the second light position information are the same, determining the first light position information as alarm information;
and when the first lamp position information and the second lamp position information are different, combining the first lamp position information and the second lamp position information to obtain alarm information.
In some possible implementations, the light level acquisition circuit includes: the acquisition unit and the alarm unit; the acquisition unit is connected with a secondary coil of the transformer; the acquisition unit is connected with the alarm unit; the alarm unit is connected with the control module.
In some possible implementations, the alarm unit includes a dial and an alarm cable; the dial device is connected with the acquisition unit; the dial is also connected with an alarm cable; the alarm cable is connected with the control module.
In some possible implementations, the voltage square wave operation circuit includes: a first comparator;
One input end of the first comparator is connected with the voltage acquisition circuit, and the other input end of the first comparator is grounded; the output end of the first comparator is connected with the control module.
In some possible implementations, the current square wave operation circuit includes a second comparator;
One input end of the second comparator is connected with the voltage acquisition circuit, and the other input end of the second comparator is grounded; the output end of the second comparator is connected with the control module.
In some possible implementations, the receiver further includes a fault light level indicator light connected to the control module.
A second aspect of the embodiments of the present invention provides a lighting system, including a signal machine and a lighting broken wire positioning alarm receiver as in the first aspect above; the lighting broken wire positioning alarm receiver is connected with the annunciator.
The embodiment of the invention provides a lighting broken wire positioning alarm receiver and a lighting system, wherein the receiver comprises a control module, a lamp position acquisition circuit, a voltage acquisition circuit, a current acquisition circuit, a voltage square wave operation circuit and a current square wave operation circuit; the lamp position acquisition circuit is connected with the lighting circuit through a mutual inductor; the voltage acquisition circuit and the current acquisition circuit are connected between the lighting power supply and the lighting circuit; the voltage acquisition circuit is connected with the voltage square wave operation circuit; the current acquisition circuit is connected with the current square wave operation circuit; the lamp position acquisition circuit, the voltage square wave operation circuit and the current square wave operation circuit are all connected with the control module; the control module is used for executing the following steps: acquiring first lamp position information reported by a lamp position acquisition circuit, a voltage square wave of a voltage square wave operation circuit and a current square wave of a current square wave operation circuit; determining second lamp position information according to the voltage square wave and the current square wave; and determining alarm information according to the first lamp position information and the second lamp position information. By collecting the voltage and the current of the lamp circuit, the phase difference change of the voltage and the current caused by the inductance change in the analysis circuit is analyzed, so that the second lamp position information is determined, the second lamp position information is checked with the first lamp position information of the lamp position acquisition circuit, and the accuracy of lamp position monitoring is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a lighting system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a lighting broken wire positioning alarm receiver according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Fig. 1 is a schematic diagram of a lighting system according to an embodiment of the present invention. As shown in fig. 1, in some embodiments, a lighting broken wire positioning alarm receiver 11 is connected with an annunciator 12; at least one lighting circuit is arranged in the annunciator 12; the lighting circuit is powered by a lighting power supply.
In the embodiment of the invention, the lighting unit comprises a lighting transformer, a filament conversion relay, a main filament and an auxiliary filament; the lighting power supply is connected with the lighting transformer; the lighting transformer is connected with the filament conversion relay; the control coil of the filament conversion relay is connected with the main filament in series; the switch of the filament conversion relay is connected with the auxiliary filament in series; and in the normal running state of the main filament, the control coil of the filament conversion relay is electrified to suck the switch. When the main wire fails, the control coil of the filament conversion relay is powered off, the switch is closed, the auxiliary wire starts to work, and at the moment, the lighting broken wire positioning alarm receiver 11 detects the failure occurrence and carries out corresponding alarm.
Fig. 2 is a schematic structural diagram of a lighting broken wire positioning alarm receiver according to an embodiment of the present invention. As shown in fig. 2, in some embodiments, the lighting broken wire positioning alarm receiver includes: the device comprises a control module 21, a lamp position acquisition circuit 22, a voltage acquisition circuit 23, a current acquisition circuit 24, a voltage square wave operation circuit 25 and a current square wave operation circuit 26;
The lamp position acquisition circuit 22 is connected with the lighting circuit through a mutual inductor; the voltage acquisition circuit 23 and the current acquisition circuit 24 are connected between the lighting power supply and the lighting circuit; the voltage acquisition circuit 23 is connected with the voltage square wave operation circuit 25; the current acquisition circuit 24 is connected with the current square wave operation circuit 26; the lamp position acquisition circuit 22, the voltage square wave operation circuit 25 and the current square wave operation circuit 26 are all connected with the control module 21;
the control module 21 is configured to perform the following steps: acquiring first lamp position information reported by a lamp position acquisition circuit 22, and a voltage square wave of a voltage square wave operation circuit 25 and a current square wave of a current square wave operation circuit 26; determining second lamp position information according to the voltage square wave and the current square wave; and determining alarm information according to the first lamp position information and the second lamp position information.
In the embodiment of the present invention, the current collecting circuit 24 may be a transformer or a hall sensor, and is formed by combining a plurality of circuit devices. The voltage acquisition circuit 24 may be a voltage sensor, formed in combination with a number of circuit devices. The voltage square wave operation circuit 25 and the current square wave operation circuit 26 are used for rectifying the sine wave of the collected voltage and current into a square wave.
In some embodiments, the control module 21 is to: calculating a first phase difference of the voltage square wave operation circuit 25 and the current square wave of the current square wave operation circuit 26 in real time; calculating a difference value between a first phase difference of a period previous to the current period and a first phase difference of the current period; and determining second lamp position information according to the difference value.
In the embodiment of the invention, the specifications of the main wire and the auxiliary wire are identical. However, the main wire is connected in series with a control coil of a relay, and the auxiliary wire is connected in series with a primary coil of a transformer, and due to different coil inductances, the equivalent inductance in the circuit can be changed at the moment of switching the main wire and the auxiliary wire, and the inductance can generally influence the phase difference between voltage and current, so that the change of the equivalent inductance necessarily causes different phase differences before and after the moment of switching the main wire and the auxiliary wire.
The current period may be 3s, 5s, etc., which is not limited herein. The previous period of the current period is specifically a period 2s before the current period, and the duration of the previous period of the current period is the same as that of the current period. The reserved 2s is to avoid voltage and current abrupt change at the switching moment, namely the first phase difference during stable operation after the switching of the main wire and the auxiliary wire is used for subtracting the first phase difference during stable operation before the switching of the main wire and the auxiliary wire.
In some embodiments, the coil inductances of the filament switching relays in the respective lighting circuits are the same; the inductances of the primary coils of the mutual inductors corresponding to the lighting circuits are different, and the inductances of any primary coil are smaller than or larger than the coil inductances of the filament conversion relay;
The control module 21 is configured to: calculating an equivalent inductance according to the difference value; and determining second lamp position information according to the equivalent inductance.
In the embodiment of the invention, the main wire and the auxiliary wire are connected in parallel, so that the control coil and the primary coil are also equivalent to be connected in parallel. The equivalent resistance is calculated as: 1/leq=1/l1+1/l2+1/l3+ … +1/Ln. If the inductance of the primary coil is larger than the inductance of the control coil of the filament switching relay, the inductance L1 is changed from the control coil to the primary coil when the primary wire of the first lighting circuit fails, L1 is increased, and the equivalent resistance Leq is increased.
As can be seen from the above principle, as long as the primary coils with different inductance values are provided, the control coils with the same inductance value are provided, that is, the inductance change caused by the failure of each lighting circuit is different. Therefore, the corresponding relation between the phase difference generated by switching the state of each lamp position and the equivalent inductance is determined through experiments in advance. When the actual circuit operates, the phase difference is detected, the equivalent inductance can be obtained by inquiring experimental data, and accordingly the faulty lamp position, namely the second lamp position information, can be judged.
In some embodiments, the control module 21 is to: when the first light position information and the second light position information are the same, determining the first light position information as alarm information; and when the first lamp position information and the second lamp position information are different, combining the first lamp position information and the second lamp position information to obtain alarm information.
In some embodiments, the light level acquisition circuit 22 includes: the acquisition unit and the alarm unit; the acquisition unit is connected with a secondary coil of the transformer; the acquisition unit is connected with the alarm unit; the alarm unit is connected to the control module 21.
In the embodiment of the invention, the primary coil of the transformer of the lamp position acquisition circuit 22 is connected in series with the secondary wire. The acquisition unit acquires the current of the secondary coil of the transformer of the lamp position acquisition circuit 22.
In some embodiments, the alarm unit includes a dial and an alarm cable; the dial device is connected with the acquisition unit; the dial is also connected with an alarm cable; the alarm cable is connected to the control module 21.
In the embodiment of the invention, when the current is collected by the collection unit corresponding to any lighting circuit, the fault of the lighting circuit is indicated, the auxiliary wire is switched to operate, and the dial is used for dialing and is reported to the control module 21 through the alarm cable. And the address code is used for setting the broken wire positioning alarm. The address code of the dialer has a 2-bit code; the dial switch is 8 bits, and 4 bits are a group of corresponding 1-bit address codes.
In some embodiments, the voltage square wave operation circuit 25 includes: a first comparator; one input end of the first comparator is connected with the voltage acquisition circuit 23, and the other input end of the first comparator is grounded; the output of the first comparator is connected to the control module 21.
In some embodiments, the current square wave operation circuit 26 includes a second comparator; one input end of the second comparator is connected with the voltage acquisition circuit 23, and the other input end of the second comparator is grounded; the output of the second comparator is connected to the control module 21.
In some embodiments, the receiver further comprises a fault light level indicator light connected to the control module 21.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other manners. For example, the apparatus/terminal embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, and the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (10)
1. The lighting broken wire positioning alarm receiver is characterized in that the lighting broken wire positioning alarm receiver is connected with a signal machine; at least one lighting circuit is arranged in the annunciator; the lighting circuit is powered by a lighting power supply; the receiver includes: the device comprises a control module, a lamp position acquisition circuit, a voltage acquisition circuit, a current acquisition circuit, a voltage square wave operation circuit and a current square wave operation circuit;
the lamp position acquisition circuit is connected with the lighting circuit through a mutual inductor;
The voltage acquisition circuit and the current acquisition circuit are connected between the lighting power supply and the lighting circuit;
The voltage acquisition circuit is connected with the voltage square wave operation circuit; the current acquisition circuit is connected with the current square wave operation circuit;
The lamp position acquisition circuit, the voltage square wave operation circuit and the current square wave operation circuit are all connected with the control module;
The control module is used for executing the following steps:
Acquiring first lamp position information reported by a lamp position acquisition circuit, a voltage square wave of a voltage square wave operation circuit and a current square wave of a current square wave operation circuit;
determining second lamp position information according to the voltage square wave and the current square wave;
And determining alarm information according to the first lamp position information and the second lamp position information.
2. The lighting broken wire positioning alarm receiver according to claim 1, wherein the control module is configured to:
Calculating a first phase difference of a voltage square wave of the voltage square wave operation circuit and a current square wave of the current square wave operation circuit in real time;
calculating a difference value between a first phase difference of a period previous to the current period and a first phase difference of the current period;
And determining second lamp position information according to the difference value.
3. The lighting broken wire positioning alarm receiver according to claim 2, wherein coil inductances of filament switching relays in the respective lighting circuits are the same; the inductances of the primary coils of the mutual inductors corresponding to the lighting circuits are different, and the inductances of any primary coil are smaller than or larger than the coil inductances of the filament conversion relay; the control module is used for:
calculating an equivalent inductance according to the difference value;
And determining second lamp position information according to the equivalent inductance.
4. The lighting broken wire positioning alarm receiver according to claim 1, wherein the control module is configured to:
when the first light level information and the second light level information are the same, determining the first light level information as alarm information;
And when the first lamp position information and the second lamp position information are different, combining the first lamp position information and the second lamp position information to obtain the alarm information.
5. The lighting broken wire positioning alarm receiver according to claim 1, wherein the lamp position acquisition circuit comprises: the acquisition unit and the alarm unit; the acquisition unit is connected with a secondary side coil of the transformer; the acquisition unit is connected with the alarm unit; the alarm unit is connected with the control module.
6. The lighting broken wire positioning alarm receiver according to claim 5, wherein the alarm unit comprises a dial and an alarm cable; the dial is connected with the acquisition unit; the dial is also connected with the alarm cable; the alarm cable is connected with the control module.
7. The lighting broken wire positioning alarm receiver according to claim 1, wherein the voltage square wave operation circuit comprises: a first comparator;
One input end of the first comparator is connected with the voltage acquisition circuit, and the other input end of the first comparator is grounded; the output end of the first comparator is connected with the control module.
8. The lighting broken wire positioning alarm receiver according to claim 1, wherein the current square wave operation circuit includes a second comparator;
one input end of the second comparator is connected with the voltage acquisition circuit, and the other input end of the second comparator is grounded; and the output end of the second comparator is connected with the control module.
9. The lighting broken wire positioning alarm receiver according to any one of claims 1-8, wherein the receiver further comprises a fault light level display light, the fault light level display light being connected to the control module.
10. A lighting system comprising a signaling device and a lighting broken wire positioning alarm receiver as defined in any one of claims 1-9; the lighting broken wire positioning alarm receiver is connected with the annunciator.
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| CN202410533348.0A CN118131080B (en) | 2024-04-30 | 2024-04-30 | Lighting broken wire positioning alarm receiver and lighting system |
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| CN202410533348.0A CN118131080B (en) | 2024-04-30 | 2024-04-30 | Lighting broken wire positioning alarm receiver and lighting system |
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