Commercial power line fault alarm device

Abstract

The utility model relates to the field of commercial power supply, in particular to a commercial power line fault alarm device, which is characterized in that a first circuit breaker is respectively connected with a first commercial power supply loop and a bus tie circuit breaker; the second circuit breaker is connected with the second commercial power supply loop and the bus tie circuit breaker. A coil of the first intermediate relay assembly and the first air switch are arranged in a first three-phase line of the first mains supply loop; a coil of the second intermediate relay assembly and the second air switch are arranged in a second three-phase line of the second mains supply loop; and an auxiliary contact of the first intermediate relay assembly and an auxiliary contact of the second intermediate relay assembly are respectively connected with two sides of an auxiliary contact of the bus tie circuit breaker and are connected with an input module of the PLC, so that the technical problem that operation and maintenance personnel cannot timely know the occurrence of a fault due to the fact that an existing low-voltage power distribution system cannot output an alarm is solved.

Description

Technical Field

[0001] The utility model relates to the field of mains power supply, in particular to a mains line fault alarm device. Background Art

[0002] In industrial fields such as cement, mining, metallurgy, building materials, petroleum, and chemical industries that adopt a low-voltage power supply system, two-way mains power supply is often adopted, and a bus-tie breaker is arranged in the middle, and a low-voltage distribution system without an automatic standby power supply function is used for power supply. Under normal circumstances, the two busbars of this low-voltage distribution system each carry half of the load, the bus-tie breaker is in the off state, and the two busbars independently supply power to the load. However, when any one or both mains power supplies have faults such as grounding or disconnection, the low-voltage distribution system does not have a fault alarm function, resulting in maintenance personnel being unable to know the occurrence of the fault in time. Therefore, it is necessary to propose a fault alarm device suitable for this low-voltage distribution system. Summary of the Utility Model

[0003] An embodiment of the utility model discloses a mains line fault alarm device, which is used to solve the technical problem that the existing low-voltage distribution system does not have a fault alarm function, resulting in maintenance personnel being unable to know the occurrence of the fault in time.

[0004] An embodiment of the utility model provides a mains line fault alarm device, which includes: a first circuit breaker, a second circuit breaker, a bus-tie breaker, a first intermediate relay assembly, a second intermediate relay assembly, a first air switch, and a second air switch;

[0005] The first circuit breaker is respectively connected to a first mains power supply circuit and the bus-tie breaker;

[0006] The second circuit breaker is respectively connected to a second mains power supply circuit and the bus-tie breaker;

[0007] The coil of the first intermediate relay assembly and the first air switch are arranged in the first three-phase line of the first mains power supply circuit;

[0008] The coil of the second intermediate relay assembly and the second air switch are arranged in the second three-phase line of the second mains power supply circuit;

[0009] The auxiliary contacts of the first intermediate relay assembly and the auxiliary contacts of the second intermediate relay assembly are respectively connected to both sides of the auxiliary contact of the bus-tie breaker,

[0010] The auxiliary contacts of the first intermediate relay assembly, the auxiliary contacts of the second intermediate relay assembly, and the auxiliary contact of the bus-tie breaker are respectively connected to the input module of the PLC controller.

[0011] Optionally, the first intermediate relay assembly includes: a first intermediate relay and a second intermediate relay;

[0012] The coil of the first intermediate relay is provided between the first phase line and the second phase line of the first three-phase line;

[0013] The coil of the second intermediate relay is provided between the second phase line and the third phase line of the first three-phase line;

[0014] The auxiliary contacts of the first intermediate relay and the auxiliary contacts of the second intermediate relay are connected in parallel, and are respectively connected to the input module of the PLC controller and to one side of the auxiliary contacts of the bus-tie breaker.

[0015] Optionally, the second intermediate relay assembly includes: a third intermediate relay and a fourth intermediate relay;

[0016] The coil of the third intermediate relay is provided between the first phase line and the second phase line of the second three-phase line;

[0017] The coil of the fourth intermediate relay is provided between the second phase line and the third phase line of the second three-phase line;

[0018] The auxiliary contacts of the third intermediate relay and the auxiliary contacts of the fourth intermediate relay are connected in parallel, and are respectively connected to the input module of the PLC controller and to the other side of the auxiliary contacts of the bus-tie breaker.

[0019] Optionally, it further includes a display module;

[0020] The display module is connected to the output module of the PLC controller.

[0021] Optionally, the display module includes a background monitoring computer.

[0022] Optionally, it further includes a sound alarm module;

[0023] The sound alarm module is connected to the PLC controller, or the sound alarm module is connected to the display module.

[0024] Optionally, it further includes a light alarm module;

[0025] The light alarm module is connected to the PLC controller, or the light alarm module is connected to the display module.

[0026] Optionally, the sound alarm module includes a speaker.

[0027] Optionally, the light alarm module includes a warning light.

[0028] Optionally, it further includes a UPS power supply, which is connected to the PLC controller and the display module.

[0029] As can be seen from the above technical solutions, the embodiments of the present utility model have the following advantages:

[0030] The present utility model provides a mains line fault alarm device, which includes a first circuit breaker, a second circuit breaker, a bus tie circuit breaker, a first intermediate relay assembly, a second intermediate relay assembly, a first air switch and a second air switch; the first circuit breaker is respectively connected to a first mains power supply circuit and the bus tie circuit breaker; the second circuit breaker is respectively connected to a second mains power supply circuit and the bus tie circuit breaker; the coil of the first intermediate relay assembly and the first air switch are arranged in a first three-phase line of the first mains power supply circuit; the coil of the second intermediate relay assembly and the second air switch are arranged in a second three-phase line of the second mains power supply circuit; the auxiliary contacts of the first intermediate relay assembly and the auxiliary contacts of the second intermediate relay assembly are respectively connected to both sides of the auxiliary contact of the bus tie circuit breaker, and the auxiliary contacts of the first intermediate relay assembly, the auxiliary contacts of the second intermediate relay assembly and the auxiliary contact of the bus tie circuit breaker are respectively connected to the input module of the PLC controller.

[0031] In the present utility model, the coil of the first intermediate relay assembly and the first air switch are arranged in the first three-phase line of the first mains power supply circuit; when a fault occurs in the first mains power supply circuit, the coil of the first intermediate relay assembly loses power, triggering the auxiliary contact of the first intermediate relay assembly to close; the coil of the second intermediate relay assembly and the second air switch are arranged in the second three-phase line of the second mains power supply circuit, when a fault occurs in the second mains power supply circuit, the coil of the second intermediate relay assembly loses power, triggering the auxiliary contact of the second intermediate relay assembly to close; the auxiliary contacts of the first intermediate relay assembly and the auxiliary contacts of the second intermediate relay assembly are respectively connected to both sides of the auxiliary contact of the bus tie circuit breaker, and the auxiliary contacts of the first intermediate relay assembly, the auxiliary contacts of the second intermediate relay assembly and the auxiliary contact of the bus tie circuit breaker are respectively connected to the input module of the PLC controller, so that when the auxiliary contact of the first intermediate relay assembly closes, the input module of the PLC controller receives the fault signal generated by the closing of the auxiliary contact of the first intermediate relay assembly, and when the auxiliary contact of the second intermediate relay assembly closes, the input module of the PLC controller receives the fault signal generated by the closing of the auxiliary contact of the second intermediate relay assembly, thereby realizing the alarm of the faulty line, and further enabling the operation and maintenance staff to determine the faulty line by checking the signal received by the input module of the PLC controller.

[0032] Therefore, in the present utility model, by arranging a first intermediate relay assembly and a second intermediate relay assembly in the first three-phase line of the first mains power supply circuit and the second three-phase line of the second mains power supply circuit, and setting the connection relationship between the first intermediate relay assembly, the second intermediate relay assembly and the input module of the PLC controller, when a line fault occurs, a fault signal is output through the intermediate relay assembly, realizing the warning of the faulty line, enabling the operation and maintenance personnel to timely know the occurrence of the fault, and solving the technical problem that the existing low-voltage power distribution system does not have a fault alarm function, resulting in the operation and maintenance personnel being unable to timely know the occurrence of the fault. Brief Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 It is a schematic connection structure diagram of a mains line fault alarm device provided in an embodiment of the present utility model;

[0035] Figure 2 It is a schematic connection structure diagram of the primary system side of a mains line fault alarm device provided in an embodiment of the present utility model;

[0036] Figure 3 It is a schematic connection structure diagram of the auxiliary contacts of a mains line fault alarm device provided in an embodiment of the present utility model;

[0037] In the figure, DY1 is the first mains power supply circuit; DY2 is the second mains power supply circuit; QF1 is the first circuit breaker of the first mains power supply circuit DY1; QF2 is the second circuit breaker of the second mains power supply circuit DY2; QF3 is the bus-coupler circuit breaker; QF4 is the first air switch of the first mains power supply circuit DY1; QF5 is the second air switch of the second mains power supply circuit DY2; K1, K2, K3, K4 are respectively the coil and auxiliary contacts of the first intermediate relay, the coil and auxiliary contacts of the second intermediate relay, the coil and auxiliary contacts of the third intermediate relay, and the coil and auxiliary contacts of the fourth intermediate relay; K5 is the auxiliary contact of the bus-coupler circuit breaker QF3. Detailed Embodiments

[0038] The present utility model provides a mains line fault alarm device for solving the technical problem that the existing low-voltage power distribution system cannot output an alarm, resulting in the operation and maintenance personnel being unable to timely know the occurrence of the fault.

[0039] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work belong to the scope of protection of the present utility model.

[0040] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "front", "rear", "upper", "lower", "both ends", "center", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. The relational terms such as "first", "second", etc. are only used to distinguish one entity from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities.

[0041] Unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "fixation", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0042] Please refer to Figures 1-3 , a mains power line fault alarm device provided in an embodiment of the present utility model is applicable to a low-voltage distribution system with two-way mains power supply, a bus tie switch in the middle, and no automatic standby power supply function. In the low-voltage distribution system, under normal circumstances, two sections of busbars of the two-way mains power supply circuits respectively supply partial loads, and the bus tie circuit breaker QF3 is in the off state; when any one of the mains power supply circuits fails and power is cut off, the circuit breaker of the faulty line is manually disconnected, and the bus tie circuit breaker QF3 is closed. At this time, the non-faulty line supplies power to the two sections of busbars.

[0043] Among them, the mains power line fault alarm device includes: a first circuit breaker QF1, a second circuit breaker QF2, a bus tie circuit breaker QF3, a first intermediate relay assembly, a second intermediate relay assembly, a first air switch QF4, and a second air switch QF5;

[0044] The first circuit breaker QF1 is respectively connected to the first mains power supply circuit DY1 and the bus tie circuit breaker QF3;

[0045] The second circuit breaker QF2 is respectively connected to the second mains power supply circuit DY2 and the bus-tie circuit breaker QF3;

[0046] The coil of the first intermediate relay assembly and the first air switch QF4 are arranged in the first three-phase line of the first mains power supply circuit DY1;

[0047] The coil of the second intermediate relay assembly and the second air switch QF5 are arranged in the second three-phase line of the second mains power supply circuit DY2;

[0048] The auxiliary contacts of the first intermediate relay assembly and the auxiliary contacts of the second intermediate relay assembly are respectively connected to both sides of the auxiliary contact K5 of the bus-tie circuit breaker QF3;

[0049] The auxiliary contacts of the first intermediate relay assembly, the auxiliary contacts of the second intermediate relay assembly and the auxiliary contact K5 of the bus-tie circuit breaker QF3 are respectively connected to the input module of the PLC controller.

[0050] It should be noted that the first circuit breaker QF1 and the second circuit breaker QF2 are used to connect and disconnect the mains power supply; the first air switch QF4 and the second air switch QF5 are respectively used to provide system power for the coil of the first intermediate relay assembly and the coil of the second intermediate relay assembly. When the first air switch QF4 is closed, the coil of the first intermediate relay assembly is connected to the system power supply and gets energized. When the first air switch QF4 is opened, the coil of the first intermediate relay assembly loses power; when the second air switch QF5 is closed, the coil of the second intermediate relay assembly is connected to the system power supply and gets energized. When the second air switch QF5 is opened, the coil of the second intermediate relay assembly loses power.

[0051] The first intermediate relay assembly and the second intermediate relay assembly are used to control the opening and closing of their normally open auxiliary contacts and normally closed auxiliary contacts through the energization and de-energization of their coils to generate a fault signal.

[0052] The auxiliary contact K5 of the bus-tie circuit breaker QF3 is a normally open contact. When the bus-tie circuit breaker QF3 is closed, the auxiliary contact K5 of the bus-tie circuit breaker QF3 is closed; when the bus-tie circuit breaker QF3 is opened, the auxiliary contact K5 of the bus-tie circuit breaker QF3 is opened.

[0053] The input modules of the PLC controller are respectively connected to the first intermediate relay assembly, the second intermediate relay assembly, and the auxiliary contacts of the bus-tie switch relay. When each auxiliary contact is closed or opened, corresponding switch quantities will be generated. The input module of the PLC controller can convert the switch quantity signals generated by the closing or opening of the auxiliary contacts into digital quantity signals. Therefore, by checking the digital quantity signals obtained from the input module of the PLC controller, it is possible to determine whether a line fault has occurred. It can be understood that the existing input modules of PLC controllers all have the function of converting switch quantities into digital quantity signals. The present utility model uses an off-the-shelf product of an existing and mature input module of a PLC controller on the market, and does not involve the improvement of its conversion function. One of the improvements of the present utility model lies in the connection relationship between the input module of the PLC controller and the first intermediate relay assembly, the second intermediate relay assembly, and the auxiliary contact K5 of the bus-tie circuit breaker QF3.

[0054] The working principle of this embodiment is as follows:

[0055] When a fault occurs in the first mains power supply circuit DY1, the first circuit breaker QF1 is in the open state, causing the coil of the first intermediate relay assembly to lose power, resulting in the closing of the auxiliary contacts of the first intermediate relay assembly. At this time, the input module of the PLC controller receives the switch quantity signal generated by the closing of the auxiliary contacts of the first intermediate relay assembly and converts it into a digital quantity signal "1", indicating that a fault has occurred in the first mains power supply circuit DY1. When the first mains power supply circuit DY1 is normal, the first circuit breaker QF1 is in the closed state, causing the coil of the first intermediate relay assembly to be powered on, resulting in the opening of the auxiliary contacts of the first intermediate relay assembly. At this time, the input module of the PLC controller receives the switch quantity signal generated by the opening of the auxiliary contacts of the first intermediate relay assembly and converts it into a digital quantity signal "0", indicating that there is no fault in the first mains power supply circuit DY1.

[0056] When a fault occurs in the second mains power supply circuit DY2, the second circuit breaker QF2 is in the open state, causing the coil of the second intermediate relay assembly to lose power, resulting in the closing of the auxiliary contacts of the second intermediate relay assembly. At this time, the input module of the PLC controller receives the switch quantity signal generated by the closing of the auxiliary contacts of the second intermediate relay assembly and converts it into a digital quantity signal "1", indicating that a fault has occurred in the second mains power supply circuit DY2. When the second mains power supply circuit DY2 is normal, the second circuit breaker QF2 is in the closed state, causing the coil of the second intermediate relay assembly to be powered on, resulting in the opening of the auxiliary contacts of the second intermediate relay assembly. At this time, the input module of the PLC controller receives the switch quantity signal generated by the opening of the auxiliary contacts of the second intermediate relay assembly and converts it into a digital quantity signal "0", indicating that there is no fault in the second mains power supply circuit DY2.

[0057] In this embodiment, the coil of the first intermediate relay assembly and the first air switch QF4 are arranged in the first three-phase line of the first mains power supply circuit DY1; when a fault occurs in the first mains power supply circuit DY1, the coil of the first intermediate relay assembly loses power, triggering the auxiliary contact of the first intermediate relay assembly to close; the coil of the second intermediate relay assembly and the second air switch QF5 are arranged in the second three-phase line of the second mains power supply circuit DY2, and are used to trigger the auxiliary contact of the second intermediate relay assembly to close when a fault occurs in the second mains power supply circuit DY2; the auxiliary contacts of the first intermediate relay assembly, the auxiliary contact of the bus-tie breaker, and the auxiliary contacts of the second intermediate relay assembly are respectively connected to the input module of the PLC controller. Thus, when the auxiliary contact of the first intermediate relay assembly closes, the input module of the PLC controller receives the fault signal generated by the closing of the auxiliary contact of the first intermediate relay assembly. When the auxiliary contact of the second intermediate relay assembly closes, the input module of the PLC controller receives the fault signal generated by the closing of the auxiliary contact of the second intermediate relay assembly, thereby realizing the alarm for the faulty line, and further enabling the operation and maintenance staff to determine the faulty line by checking the signal received by the input module of the PLC controller.

[0058] Therefore, in this embodiment, by arranging the first intermediate relay assembly and the second intermediate relay assembly in the first three-phase line of the first mains power supply circuit DY1 and the second three-phase line of the second mains power supply circuit DY2, and setting the connection relationship between the first intermediate relay assembly, the second intermediate relay assembly and the input module of the PLC controller, when a fault occurs in the line, the intermediate relay assembly outputs a fault signal, realizing the alarm for the faulty line, enabling the operation and maintenance staff to know the occurrence of the fault in time, and solving the technical problem that the existing low-voltage distribution system does not have a fault alarm function, resulting in the operation and maintenance staff being unable to know the occurrence of the fault in time.

[0059] In a specific embodiment, the first intermediate relay assembly includes: a first intermediate relay K1 and a second intermediate relay K2;

[0060] The coil of the first intermediate relay K1 is arranged between the first phase line and the second phase line of the first three-phase line;

[0061] The coil of the second intermediate relay K2 is arranged between the second phase and the third phase line of the first three-phase line;

[0062] The auxiliary contacts of the first intermediate relay K1 and the auxiliary contacts of the second intermediate relay K2 are connected in parallel, and are respectively connected to the input module of the PLC controller and to one side of the auxiliary contact K5 of the bus-tie breaker QF3.

[0063] It should be noted that, asFigure 1 As shown, the coil of the first intermediate relay K1 is connected between the A-phase line and the B-phase line of the first mains power supply circuit DY1. The coil of the second intermediate relay K2 is connected between the B-phase line and the C-phase line of the first mains power supply circuit DY1. The first air switch QF4 is arranged below the coil of the first intermediate relay and the coil of the second intermediate relay K2.

[0064] As Figure 3 shown, the auxiliary contacts of the first intermediate relay K1 and the auxiliary contacts of the second intermediate relay K2 are in parallel, and are connected to one side of the auxiliary contact K5 of the bus-tie circuit breaker QF3, and are connected to the positive pole PLC+ and the negative pole PLC- of the input module of the PLC controller.

[0065] It should be noted that when the digital quantity signal of the first intermediate relay K1 is 1 and / or the digital quantity signal of the second intermediate relay K2 is 1, it indicates that the first mains power supply circuit DY1 fails. Only when the digital quantity signal of the first intermediate relay K1 is 0 and the digital quantity signal of the second intermediate relay K2 is 0, can it indicate that the first mains power supply circuit DY1 is fault-free.

[0066] In a specific embodiment, the second intermediate relay assembly includes: a third intermediate relay K3 and a fourth intermediate relay K4;

[0067] The coil of the third intermediate relay K3 is arranged between the first-phase line and the second-phase line of the second three-phase line;

[0068] The coil of the fourth intermediate relay K4 is arranged between the second-phase line and the third-phase line of the second three-phase line;

[0069] The auxiliary contacts of the third intermediate relay K3 and the auxiliary contacts of the fourth intermediate relay K4 are in parallel, and are respectively connected to the input module of the PLC controller, and are connected to the other side of the auxiliary contact K5 of the bus-tie circuit breaker QF3.

[0070] It should be noted that as Figure 1 shown, the coil of the third intermediate relay K3 is connected between the A-phase line and the B-phase line of the second mains power supply circuit DY2. The coil of the fourth intermediate relay K4 is connected between the B-phase line and the C-phase line of the second mains power supply circuit DY2. The second air switch QF5 is arranged below the coil of the third intermediate relay K3 and the coil of the fourth intermediate relay K4.

[0071] As Figure 3 shown, the auxiliary contacts of the third intermediate relay K3 and the auxiliary contacts of the fourth intermediate relay K4 are in parallel, and are connected to the other side of the auxiliary contact K5 of the bus-tie circuit breaker QF3, and are connected to the positive pole PLC+ and the negative pole PLC- of the input module of the PLC controller.

[0072] It should be noted that when the digital quantity signal of the third intermediate relay K3 is 1 and / or the digital quantity signal of the fourth intermediate relay K4 is 1, it indicates that the second utility power supply circuit DY2 has a fault. Only when the digital quantity signal of the third intermediate relay K3 is 0 and the digital quantity signal of the fourth intermediate relay K4 is 0, can it indicate that the second utility power supply circuit DY2 has no fault.

[0073] The working principle of this embodiment is as follows:

[0074] When the three-phase utility power supply of DY1 and DY2 is normally powered, the first circuit breaker QF1 and the second circuit breaker QF2 are closed, the first air switch QF4 and the second air switch QF5 are closed, the bus tie circuit breaker QF3 is opened, the coils of the first intermediate relay K1, the second intermediate relay K2, the third intermediate relay K3, and the fourth intermediate relay K4 are energized, the auxiliary contacts of the first intermediate relay K1, the second intermediate relay K2, the third intermediate relay K3, and the fourth intermediate relay K4 are opened, the auxiliary contact K5 of the bus tie circuit breaker QF3 is opened, and the digital quantity signals output by the first intermediate relay K1, the second intermediate relay K2, the third intermediate relay K3, the fourth intermediate relay K4, and the bus tie circuit breaker QF3 are all 0, indicating that there is no fault in the line.

[0075] When a fault such as phase voltage grounding or line break occurs in any one of the first utility power supply circuit DY1 and the second utility power supply circuit DY2, the corresponding first circuit breaker QF1 or the corresponding second circuit breaker QF2 is opened, causing the coil of the first intermediate relay K1 or the second intermediate relay K2 or the third intermediate relay K3 or the fourth intermediate relay K4 to lose power correspondingly. The auxiliary contact of the intermediate relay corresponding to the faulty line is closed, and the output digital quantity signal is 1, indicating that there is a line fault. For example: when a grounding or line break fault occurs in the A-phase line of the first utility power supply circuit DY1, the first circuit breaker QF1 is opened, causing the coil of the first intermediate relay K1 to lose power, resulting in the closure of the auxiliary contact of the first intermediate relay K1 and the output of a digital quantity signal of 1, indicating that there is a fault in the first utility power supply circuit DY1 line.

[0076] When the first utility power supply circuit DY1 and the second utility power supply circuit DY2 are all faulty and powered off, the coils of the first intermediate relay K1, the second intermediate relay K2, the third intermediate relay K3, and the fourth intermediate relay K4 are all powered off, causing the auxiliary contacts of the first intermediate relay K1, the second intermediate relay K2, the third intermediate relay K3, and the fourth intermediate relay K4 to all close, thereby all outputting digital quantity signals "1", indicating that the first utility power supply circuit DY1 and the second utility power supply circuit DY2 are all faulty and powered off.

[0077] When any of the mains power lines is manually shut down for maintenance, if the first circuit breaker QF1 is manually shut down, the coils of the first intermediate relay K1 and the second intermediate relay K2 are both de-energized, causing the auxiliary contacts of the first intermediate relay K1 and the second intermediate relay K2 to close, and both output a digital signal of 1, indicating a fault in the first mains power supply circuit DY1. When the second circuit breaker QF2 is manually shut down, the coils of the third intermediate relay K3 and the fourth intermediate relay K4 are both de-energized, causing the auxiliary contacts of the third intermediate relay K3 and the fourth intermediate relay K4 to close, and both output a digital signal of 1, indicating a fault in the second mains power supply circuit DY2. When the bus tie circuit breaker QF3 is manually closed, the second circuit breaker QF2 or the first circuit breaker QF1 supplies power to the two bus sections (that is, if the first circuit breaker QF1 is out of operation, the second circuit breaker QF2 supplies power to the two bus sections, and if the second circuit breaker QF2 is out of operation, the first circuit breaker QF1 supplies power to the two bus sections). At this time, the auxiliary contact K5 of the bus tie circuit breaker QF3 is closed, so that the three-phase line corresponding to the fault line is energized, thereby energizing the corresponding intermediate relay coil, and then disconnecting the corresponding auxiliary contact, thereby outputting a digital signal of 0 and releasing the fault alarm; at this time, if the other mains power is cut off (equivalent to a complete power outage of the two lines), the auxiliary contact K5 of the bus tie circuit breaker QF3 is disconnected, and the coils of the first intermediate relay assembly and the second intermediate relay assembly are both de-energized, and the auxiliary contacts are both closed, thereby outputting a digital signal of 1, indicating that both the DY1 line and the DY2 line are faulty.

[0078] In a specific embodiment, it also includes a display module;

[0079] The display module is connected to the output module of the PLC controller.

[0080] In a specific embodiment, the display module includes a background monitoring computer.

[0081] It should be noted that in an application example, the PLC controller can output a fault signal representing the AC power circuit to the background monitoring computer based on the digital signal of the input module. The background monitoring computer outputs an alarm prompt based on the received fault signal to remind the operation and maintenance and process personnel to deal with the fault as soon as possible.

[0082] For example, pre-set the text warning messages of "DY1 line fault" and "DY2 line fault" on the background monitoring computer, and set that when the digital quantity signal of K1 or K2 is 1, the background monitoring computer outputs the text alarm message of "DY1 line fault", and when the digital quantity signals of both K1 and K2 are 0, the background monitoring computer does not output the text alarm message of "DY1 line fault"; when the digital quantity signal of K3 or K4 is 1, the background monitoring computer outputs the text alarm message of "DY2 line fault", and when the digital quantity signals of both K3 and K4 are 0, the background monitoring computer does not output the text alarm message of "DY2 line fault".

[0083] In a specific embodiment, it further includes a sound alarm module;

[0084] The sound alarm module is connected to the PLC controller, or the sound alarm module is connected to the display module.

[0085] In a specific embodiment, it further includes a light alarm module;

[0086] The light alarm module is connected to the PLC controller, or the light alarm module is connected to the display module.

[0087] In a specific embodiment, the sound alarm module includes a speaker.

[0088] In a specific embodiment, the light alarm module includes a warning light.

[0089] It should be noted that in an application example, the warning light can be set to flash for alarm in the background monitoring computer in advance, and at the same time, the speaker alarm is added, and a sound warning is output during the alarm.

[0090] For example: when it is necessary to output "DY1 line fault" and "DY2 line fault", the background monitoring computer screen displays the text warnings of "DY1 line fault" and "DY2 line fault", the warning light flashes, and the speaker outputs a sound alarm to prompt the operation and maintenance personnel that a two-way mains power failure has occurred. When it is necessary to output "DY1 line fault", the background monitoring computer screen displays the text warning of "DY1 line fault", at the same time the warning light flashes, and the speaker outputs a sound alarm to prompt the operation and maintenance personnel that the DY1 line has a fault. When it is necessary to output "DY2 line fault", the background monitoring computer screen displays the text warning of "DY2 line fault", at the same time the warning light flashes, and the speaker outputs a sound alarm to prompt the operation and maintenance personnel that the DY2 line has a fault.

[0091] In a specific embodiment, it further includes a UPS power supply, and the UPS power supply is connected to the PLC controller and the display module.

[0092] The above has introduced in detail a mains power line fault alarm device provided by the present utility model. For those of ordinary skill in the art, according to the idea of the embodiments of the present utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A mains power line fault alarm device, characterized in that: The device comprises: a first circuit breaker, a second circuit breaker, a bus tie circuit breaker, a first intermediate relay assembly, a second intermediate relay assembly, a first air switch and a second air switch; The first circuit breaker is connected to the first mains power supply circuit and the bus tie circuit breaker respectively; The second circuit breaker is connected to the second mains power supply circuit and the bus tie circuit breaker respectively; The coil of the first intermediate relay assembly and the first air switch are arranged in the first three-phase circuit of the first mains power supply circuit; The coil of the second intermediate relay assembly and the second air switch are arranged in the second three-phase circuit of the second mains power supply circuit; The auxiliary contacts of the first intermediate relay assembly and the auxiliary contacts of the second intermediate relay assembly are respectively connected to two sides of the auxiliary contacts of the bus tie circuit breaker; The auxiliary contacts of the first intermediate relay assembly, the auxiliary contacts of the second intermediate relay assembly and the auxiliary contacts of the bus tie circuit breaker are respectively connected to the input module of the PLC controller.

2. The device according to claim 1, characterized in that The first intermediate relay assembly includes: a first intermediate relay and a second intermediate relay; The first phase circuit and the second phase circuit of the first three-phase circuit are provided with the coil of the first intermediate relay; A coil of the second intermediate relay is arranged between the second phase and the third phase of the first three-phase circuit; The auxiliary contacts of the first intermediate relay and the auxiliary contacts of the second intermediate relay are connected in parallel, and are respectively connected to the input module of the PLC controller, and are connected to one side of the auxiliary contacts of the bus tie circuit breaker.

3. The device according to claim 1, characterized in that The second intermediate relay assembly includes: a third intermediate relay and a fourth intermediate relay; The first phase circuit and the second phase circuit of the second three-phase circuit are provided with the coil of the third intermediate relay; A coil of the fourth intermediate relay is arranged between the second phase and the third phase of the second three-phase circuit; The auxiliary contacts of the third intermediate relay and the auxiliary contacts of the fourth intermediate relay are connected in parallel, and are respectively connected to the input module of the PLC controller, and are connected to the other side of the auxiliary contacts of the bus tie circuit breaker.

4. The device according to claim 1, characterized in that Also includes a display module; The display module is connected to the output module of the PLC controller.

5. The device according to claim 4, characterized in that The display module includes a background monitoring computer.

6. The device according to claim 4, characterized in that Also includes an audible alarm module; The sound alarm module is connected to the PLC controller, or the sound alarm module is connected to the display module.

7. The device according to claim 4, characterized in that Also includes a light alarm module; The optical alarm module is connected to the PLC controller, or the optical alarm module is connected to the display module.

8. The device according to claim 6, characterized in that The sound alarm module includes a speaker.

9. The device according to claim 7, characterized in that The optical alarm module includes a warning light.

10. The device according to claim 4, characterized in that It also includes a UPS power supply, which is connected to the PLC controller and the display module.

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