Three-phase open-phase alarm with zero line alarm

Abstract

The utility model relates to a three-phase open-phase alarm with zero line alarm. An alarm module is assembled in a hollow main body and can give out light and sound alarm; the alarm module is provided with an audible and visual alarm circuit, a first phase power supply circuit, a second phase power supply circuit and a third phase power supply circuit, a first live wire of the first phase power supply circuit is communicated with a three-phase live wire terminal L1, and a first optical coupler is arranged between the first live wire and a zero line terminal N; a second live wire of the second-phase power supply circuit is communicated with the three-phase live wire terminal L2, and a second optical coupler is arranged between the second live wire and the zero line terminal N; a third live wire of the third-phase power supply circuit is communicated with the three-phase live wire terminal L3, and a third optical coupler is arranged between the third live wire and the zero line terminal N; the three optical couplers are sequentially connected in series, and the output end of the third optical coupler is connected with the audible and visual alarm circuit through the switching tube, so that sound and light alarm can be generated when any one or two of the 380V three-phase four-wire system power supply is broken. And the product is modularized and has good practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply circuit systems, in particular to monitoring of a 380V three-phase four-wire power supply. Background Art

[0002] In a low-voltage 380V three-phase power system, a phase or neutral line may become disconnected due to circuit faults or rusted switch contacts. If not promptly notified or alerted, this can damage electrical equipment and potentially cause personal injury. Therefore, it is essential to install a three-phase loss alarm. However, typical three-phase loss alarm detection instruments only detect open circuits in the power system's three phase lines, but fail to check the neutral line for normal operation. Summary of the Invention

[0003] The purpose of the utility model is to provide a single-phase two-way power failure alarm device with a simple structure, easy installation and use, and the function of detecting and alarming when the neutral line is broken, thereby solving the problem of no alarm when the neutral line is disconnected in a three-phase four-wire power supply system.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A three-phase phase loss alarm with a neutral line alarm, which has:

[0006] A hollow body, on which are provided three-phase live wire terminal L1, three-phase live wire terminal L2, three-phase live wire terminal L3 and neutral wire terminal N;

[0007] An alarm module is assembled in the hollow body and can emit light and sound alarms through the hollow body; the alarm module comprises an audible and visual alarm circuit, a first-phase power circuit, a second-phase power circuit, and a third-phase power circuit; the first live wire of the first-phase power circuit is connected to the three-phase live wire terminal L1, and a first optical coupler is provided between the first live wire and the neutral wire terminal N; the second live wire of the second-phase power circuit is connected to the three-phase live wire terminal L2, and a second optical coupler is provided between the second live wire and the neutral wire terminal N; the third live wire of the third-phase power circuit is connected to the three-phase live wire terminal L3, and a third optical coupler is provided between the third live wire and the neutral wire terminal N;

[0008] The first optocoupler, the second optocoupler, and the third optocoupler are connected in series in sequence, and the output end of the third optocoupler is connected to the sound and light alarm circuit through a switch tube, so that if any one or two wires of the 380V three-phase four-wire power supply are broken, a sound and light alarm can be generated.

[0009] The above scheme is further that the sound and light alarm circuit includes a speaker, a light-emitting element and a relay. The relay is based on the action of electromagnetic induction and mechanical switch. The switch tube turns on and off the relay circuit. When the 380V three-phase four-wire power supply is in normal state, the switch tube disconnects the relay circuit, the speaker does not sound, and the light-emitting element does not light up.

[0010] The above solution is further provided with a card interface at the bottom of the hollow body, and the card interface is adapted to be connected to the rail of the electrical box.

[0011] The above solution is further that a raised boss is provided on the top of the hollow body, and a sound port and a light-emitting hole are provided on the boss. The sound port is adapted to transmit the sound emitted by the sound and light alarm circuit; the light-emitting hole is adapted to emit the light emitted by the sound and light alarm circuit.

[0012] The above solution is further characterized in that the model of the relay is HFD4-12.

[0013] The above solution is further characterized in that the model of the switching tube is 2N5551.

[0014] The above solution is further provided with a manual switch and a remote signal dry contact extending to the hollow body on the sound and light alarm circuit.

[0015] Through the design of the alarm circuit, the present invention can connect the three phases of a 380V three-phase four-wire power supply to the first, second, and third phases of the power supply circuit, respectively. The first, second, and third optical couplers are arranged and connected in series, and the output end of the third optical coupler is connected to the sound and light alarm circuit via a switch tube. This generates an audible and visual alarm if any one or two wires of the 380V three-phase four-wire power supply are disconnected. During use, the present invention is installed on the rails of an electrical box, and the three-phase live wires L1, L2, and L3 and the neutral wire N on the 380V three-phase four-wire power supply are connected to the three-phase live wire terminals L1, L2, and L3 and the neutral wire terminal N marked on the top of the present invention, respectively. This monitors the power supply for phase loss or neutral wire disconnection alarms. The modular design of the product is convenient for assembly and use, facilitating maintenance and inspection by personnel, and is removable and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attachment Figure 1 This is a schematic structural diagram of a preferred embodiment of the utility model;

[0017] Attachment Figure 2 for Figure 1 A side structural diagram of an embodiment;

[0018] Attachment Figure 3 for Figure 1 Schematic diagram of the electrical principle of the embodiment. DETAILED DESCRIPTION

[0019] The following will further illustrate the concept, specific structure and technical effects of the utility model in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the utility model.

[0020] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "vertical", "horizontal", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0021] See Figure 1 、 2 As shown in Figures 3 and 4, the present invention relates to a three-phase phase loss alarm with a neutral line alarm, which can be flexibly connected to a 380V three-phase four-wire power supply to monitor the on / off status of the power circuit and provide luminous and audible alarms. The present invention comprises a hollow body 1 and an alarm module. The hollow body 1 is made of insulating material and is provided with a card interface 11 at the bottom of the hollow body 1. The card interface 11 is adapted to be connected to the rail of the electrical box, which greatly facilitates installation and achieves standardization. The hollow body 1 is provided with a three-phase live wire terminal L1, a three-phase live wire terminal L2, a three-phase live wire terminal L3, and a neutral wire terminal N to facilitate wiring and assembly. The alarm module is assembled in the hollow body 1 and can emit light and sound alarms through the hollow body. The alarm module has an audio-visual alarm circuit 2, a first-phase power circuit 3, a second-phase power circuit 4, and a third-phase power circuit 5. The first live wire of the first-phase power circuit 3 is connected to the three-phase live wire terminal L1, and a first optical coupler 6 is set between the first live wire and the neutral wire terminal N. The second live wire of the second-phase power circuit 4 is connected to the three-phase live wire terminal L2, and a second optical coupler 7 is set between the second live wire and the neutral wire terminal N. The third live wire of the third-phase power circuit 5 is connected to the three-phase live wire terminal L3, and a third optical coupler 8 is set between the third live wire and the neutral wire terminal N. The first optical coupler 6, the second optical coupler 7, and the third optical coupler 8 are connected in series in sequence. Figure 3 As shown, in this embodiment, the output end of the first optical coupler 6 is connected to the input end of the second optical coupler 7, and the output end of the second optical coupler 7 is connected to the input end of the third optical coupler 8. The output end of the third optical coupler 8 is connected to the sound and light alarm circuit 2 through the switch tube 9. Therefore, by utilizing the linkage of the first optical coupler 6, the second optical coupler 7 and the third optical coupler 8, if any one or two wires of the 380V three-phase four-wire power supply are disconnected, the switch tube 9 can connect the sound and light alarm circuit 2, so that the sound and light alarm circuit 2 generates sound and light alarms.

[0022] In this embodiment, the sound and light alarm circuit 2 includes a speaker 21, a light-emitting element 22, and a relay 23. Relay 23 operates based on electromagnetic induction and mechanical switching. Switch 9 opens and closes the relay 23 circuit. When the 380V three-phase four-wire power supply is normal, switch 9 opens the relay 23 circuit, and speaker 21 does not sound, and light-emitting element 22 does not light up. Conversely, when relay 23 is energized, speaker 21 sounds, and light-emitting element 22 lights up.

[0023] In this embodiment, preferably, the model of the relay 23 is HFD4-12, the model of the switch tube 9 is 2N5551, and the models of the first optical coupler 6, the second optical coupler 7 and the third optical coupler 8 are all PS2505-1.

[0024] The top of the hollow body 1 is provided with a raised boss 12, and a sound-emitting port (121) and a light-emitting hole (122) are provided on the boss. The sound-emitting port 121 is adapted to transmit the sound emitted by the speaker 21 on the sound and light alarm circuit 2; the light-emitting hole 122 is adapted to emit light from the light-emitting element 22 of the sound and light alarm circuit 2. In this embodiment, the light-emitting element 22 is preferably a light-emitting LED, which is embedded in the light-emitting hole 122 and exposed during assembly. This embodiment has a simple structure, is easy to assemble, and has good visual and auditory effects, thereby improving the alarm effect.

[0025] Figure 3 As shown, in this embodiment, the sound and light alarm circuit 2 is further provided with a manual switch 24 extending from the hollow body 1 and a remote signal dry contact 25. The manual switch 24 is used to manually turn off the light and sound of the sound and light alarm circuit 2 to facilitate the next monitoring operation. During monitoring, the manual switch 24 is open and in the ON state. The remote signal dry contact 25 facilitates connection to a signal receiver, which utilizes the operating state changes of the relay 23 to obtain the corresponding remote signal, enabling remote monitoring and further improving the alarm effectiveness.

[0026] The present invention provides both luminous and audible alarms, has a simple structure, requires few components, and is easily integrated into a hollow body 1, conveniently installed and used, and has a low investment cost. Through the design of the alarm circuit, the three phases of a 380V three-phase four-wire power supply can be connected to the first phase power circuit, the second phase power circuit, and the third phase power circuit, respectively. The first, second, and third optical couplers are arranged and sequentially connected in series, and the output end of the third optical coupler is connected to the sound and light alarm circuit via a switching tube. This allows for sound and light alarms to be generated if any one or two wires of the 380V three-phase four-wire power supply are broken. The product is modular, easy to assemble and use, convenient for maintenance and inspection by staff, and is removable and practical.

[0027] Although the preferred specific embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention should not be limited to the structure and operation exactly the same as the above description and drawings. For those skilled in the art, many equivalent improvements and changes can be made to the above embodiments through logical analysis, reasoning or limited experiments without exceeding the concept and scope of the present invention, but these improvements and changes should all fall within the scope of protection claimed by the present invention.

Claims

1. A three-phase phase loss alarm with a neutral alarm, characterized in that: have: A hollow main body (1), wherein the hollow main body (1) is provided with a three-phase live wire terminal L1, a three-phase live wire terminal L2, a three-phase live wire terminal L3 and a neutral wire terminal N; An alarm module is assembled in a hollow body (1) and can emit light and sound alarms externally through the hollow body; the alarm module comprises an audible and visual alarm circuit (2), a first-phase power supply circuit (3), a second-phase power supply circuit (4) and a third-phase power supply circuit (5); a first live wire of the first-phase power supply circuit (3) is connected to a three-phase live wire terminal L1, and a first optical coupler (6) is provided between the first live wire and a neutral wire terminal N; a second live wire of the second-phase power supply circuit (4) is connected to a three-phase live wire terminal L2, and a second optical coupler (7) is provided between the second live wire and the neutral wire terminal N; a third live wire of the third-phase power supply circuit (5) is connected to a three-phase live wire terminal L3, and a third optical coupler (8) is provided between the third live wire and the neutral wire terminal N; The first optical coupler (6), the second optical coupler (7) and the third optical coupler (8) are sequentially connected in series, and the output end of the third optical coupler (8) is connected to the sound and light alarm circuit (2) via the switch tube (9), so that if any one or two wires of the 380V three-phase four-wire power supply are broken, a sound and light alarm can be generated.

2. A three-phase phase loss alarm with a neutral line alarm according to claim 1, characterized in that: The sound and light alarm circuit (2) includes a speaker (21), a light-emitting element (22) and a relay (23). The relay (23) is based on the action of electromagnetic induction and mechanical switch. The switch tube (9) switches the circuit of the relay (23) on and off. When the 380V three-phase four-wire power supply is in a normal state, the switch tube (9) disconnects the circuit of the relay (23), the speaker (21) does not sound, and the light-emitting element (22) does not light up.

3. A three-phase phase loss alarm with a neutral line alarm according to claim 1, characterized in that: A card interface (11) is provided at the bottom of the hollow body (1), and the card interface (11) is adapted to be connected to the rail of the electrical box.

4. A three-phase phase loss alarm with a neutral line alarm according to claim 1, characterized in that: The top of the hollow body (1) is provided with a raised boss (12), and the boss is provided with a sound-emitting port (121) and a light-emitting hole (122). The sound-emitting port (121) is adapted to transmit the sound emitted by the sound and light alarm circuit (2); and the light-emitting hole (122) is adapted to emit the light emitted by the sound and light alarm circuit (2).

5. The three-phase phase loss alarm with a neutral line alarm according to claim 2, characterized in that: The model of the relay (23) is HFD4-12.

6. A three-phase phase loss alarm with a neutral line alarm according to claim 1 or 2, characterized in that: The model of the switch tube (9) is 2N5551.

7. The three-phase phase loss alarm with a neutral line alarm according to claim 2, characterized in that: The sound and light alarm circuit (2) is also provided with a manual switch (24) and a remote signal dry contact (25) extending to the hollow body (1).

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