A control for a bus tie device

Abstract

The control mother joint device comprises a mother joint cabinet ML and at least two incoming line cabinets, the mother joint cabinet ML is internally provided with a mother joint controller, the two incoming line cabinets comprise a first incoming line cabinet and a second incoming line cabinet, the first incoming line cabinet is connected with a first bus, the second incoming line cabinet is connected with a second bus, the first incoming line cabinet is connected with the mother joint cabinet ML through a cable or a busbar, the second incoming line cabinet is connected with the mother joint cabinet ML through a cable or a busbar, the first incoming line cabinet is provided with a first circuit breaker QF1, the first incoming line cabinet is connected with the mother joint controller through the first circuit breaker QF1, the second incoming line cabinet is provided with a second circuit breaker QF2, the two incoming line cabinets are both provided with RS485 interfaces and are electrically connected with the mother joint controller through the RS485 interfaces. The two incoming line cabinets are controlled through the mother joint controller, a circuit breaker is arranged on each incoming line cabinet, when any section of commercial power fails or is powered off, the load can still be uninterrupted power supply.

Description

Technical Field

[0001] This utility model relates to the field of automatic control technology, specifically to a control bus coupling device. Background Technology

[0002] During the switching between dual power supplies, operational interruptions (power supply interruption to the load supplied by the power supply) or equipment impact damage may occur. In particular, when the power supply is suddenly interrupted, the motor in the system will have residual voltage for a short period of time due to motor coasting, and the out-of-step operation of the micro distributed power supply will also cause residual voltage. If the external power supply is directly connected again at this time, unnecessary losses will be caused due to the phase angle deviation. Utility Model Content

[0003] Based on this, it is necessary to propose a control bus tie device to address the problem that the above-mentioned dual power supply switching process may cause operational interruption (power supply interruption to the load) or equipment impact damage, resulting in power supply interruption to the load. This device provides a stable power supply by controlling the circuit breakers QF on the two incoming line cabinets.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A control bus coupling device, comprising: The bus tie cabinet ML is equipped with a bus tie controller inside; At least two incoming line cabinets are provided, including a first incoming line cabinet and a second incoming line cabinet. The first incoming line cabinet is connected to a first busbar, and the second incoming line cabinet is connected to a second busbar. The first incoming line cabinet is connected to the bus tie cabinet ML via a cable or busbar, and the second incoming line cabinet is connected to the bus tie cabinet ML via a cable or busbar. The first incoming line cabinet is equipped with a first circuit breaker QF1, and the first incoming line cabinet is connected to the bus tie controller via the first circuit breaker QF1. The second incoming line cabinet is equipped with a second circuit breaker QF2, and the second incoming line cabinet is connected to the bus tie controller via the second circuit breaker QF2. A circuit breaker QF3 is provided between the first incoming line cabinet and the second incoming line cabinet, and they are connected or disconnected via a cable or busbar. Both the first incoming line cabinet and the second incoming line cabinet are equipped with RS485 interfaces, and are electrically connected to the bus tie controller via the RS485 interfaces.

[0005] In some embodiments, a fuse FU1 is connected in series on the main circuit connecting the first incoming line cabinet and the first busbar.

[0006] In some embodiments, a first current transformer is provided on the first incoming line cabinet, and the first current transformer is connected in parallel with the cable or busbar.

[0007] In some embodiments, a fuse FU2 is connected in series on the main circuit between the second incoming line cabinet and the second busbar.

[0008] In some embodiments, a second current transformer is provided on the second incoming line cabinet, and the second current transformer is connected in parallel with the cable or busbar.

[0009] In some embodiments, an indicator light is provided.

[0010] In some embodiments, the bus tie cabinet ML further includes an electromagnetic switch KA and a common terminal COM, wherein the common terminal COM and the electromagnetic switch KA are connected to the incoming line cabinet.

[0011] In some embodiments, the bus tie cabinet ML is further provided with a current transformer TA, which is connected to the first bus or the second bus via a cable or busbar.

[0012] In some embodiments, a fuse is connected in parallel between the bus tie cabinet ML and the first busbar and the second busbar.

[0013] In some embodiments, an intermediate relay is connected between the first bus and the second bus.

[0014] Two incoming line cabinets are controlled by a bus tie controller. Each incoming line cabinet is equipped with a circuit breaker. When any section of the mains power fails or is interrupted, the controller controls the switching of circuit breakers QF1, QF2, and QF3, ensuring an uninterrupted power supply to the load. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] in: Figure 1 This is a circuit diagram of a control bus tie device according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the connection of a control bus coupling device according to an embodiment of the present utility model.

[0017] Figure 3 This is a circuit diagram of the control power supply of the bus tie cabinet for a control bus tie device according to an embodiment of this utility model; Detailed Implementation

[0018] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this utility model.

[0019] To address the problem in existing technologies where almost every communication begins with the same master node query frame, resulting in at least half of the time overhead being redundant, and this time waste increasing linearly with the number of nodes, To address the issue of operational interruptions (power supply interruption to the load) or equipment damage during dual power supply switching in existing technologies, resulting in power supply interruptions to the load, the following will be discussed in conjunction with the appendix. Figures 1 to 3 The present invention provides a detailed description of a control bus coupling device according to an embodiment of the present invention.

[0020] Please see Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a circuit diagram of a control bus tie device according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the connection of a control bus coupler device according to an embodiment of this utility model. Figure 3 This is a circuit diagram of the control power supply of the bus tie cabinet for a control bus tie device according to an embodiment of this utility model.

[0021] A control bus coupling device, comprising: The bus tie cabinet ML is equipped with a bus tie controller inside; At least two incoming line cabinets are provided, including a first incoming line cabinet and a second incoming line cabinet. The first incoming line cabinet is connected to a first busbar, and the second incoming line cabinet is connected to a second busbar. The first incoming line cabinet is connected to the bus tie cabinet ML via a cable or busbar, and the second incoming line cabinet is connected to the bus tie cabinet ML via a cable or busbar. The first incoming line cabinet is equipped with a first circuit breaker QF1, and the first incoming line cabinet is connected to the bus tie controller via the first circuit breaker QF1. The second incoming line cabinet is equipped with a second circuit breaker QF2, and the second incoming line cabinet is connected to the bus tie controller via the second circuit breaker QF2. A circuit breaker QF3 is provided between the first incoming line cabinet and the second incoming line cabinet, and they are connected or disconnected via a cable or busbar. Both the first incoming line cabinet and the second incoming line cabinet are equipped with RS485 interfaces, and are electrically connected to the bus tie controller via the RS485 interfaces.

[0022] Specifically, at least two incoming line cabinets should be installed, and three or more can also be installed. As a switching device used to introduce external power in a high-voltage power distribution system, the incoming line cabinet distributes the power from the grid to the bus system and has protection, metering and monitoring functions. Generally, it includes instantaneous overcurrent protection, overcurrent protection, zero-sequence protection, surge current protection and underfrequency protection. For example, after 10KV power is introduced from the grid, it is distributed to the bus system through the incoming line cabinet, and then the outgoing line cabinet supplies power to various loads. Its operating status directly affects the stability and safety of the entire system. Generally, a backup power supply is set up. During the dual power supply switching process, it may cause operation interruption (power supply interruption to the loads supplied by the power supply) or equipment impact damage, especially when the power supply is suddenly interrupted due to the inertia of the motors in the system.

[0023] The first incoming line cabinet and the external power supply are connected to the external power supply via live wire L1A and neutral wire N. It receives external power and is connected to the first bus to output power to the first bus, providing a stable three-phase power supply. The second incoming line cabinet and the external power supply are connected to the external power supply via live wire L2A and neutral wire N. It receives external power and is connected to the first bus to output power to the first bus, providing a stable three-phase power supply.

[0024] For example, when the first incoming line cabinet malfunctions and cannot provide a stable power supply to the first busbar, its RS485 interface sends a fault signal to the bus tie controller. The first circuit breaker QF1 and the third circuit breaker QF3 close. At this time, the second incoming line cabinet is connected to the first busbar via the first circuit breaker QF1, a cable or busbar, and the third circuit breaker QF3. The second incoming line cabinet then acts as the power source for the first busbar core, providing a stable power supply. When the fault in the first incoming line cabinet is cleared, the first circuit breaker QF1 and the third circuit breaker QF3 open, and the first incoming line cabinet resumes power supply to the first busbar.

[0025] When the second incoming line cabinet malfunctions and cannot provide a stable power supply, its RS485 interface sends a fault signal to the bus tie controller. The second circuit breaker QF1 and the third circuit breaker QF3 close. At this time, the first incoming line cabinet is connected to the first busbar through the second circuit breaker QF1, cable or busbar, and the third circuit breaker QF3. The second incoming line cabinet acts as a new power source for the first busbar, providing a stable power supply. When the fault in the first incoming line cabinet is cleared, the first circuit breaker QF1 and the third circuit breaker QF3 open, and the second incoming line cabinet resumes providing a stable power supply to the second busbar.

[0026] Beneficial effects: By controlling two incoming line cabinets through the bus tie controller, each cabinet is equipped with a circuit breaker. When any section of the mains power fails or is interrupted, the controller switches circuit breakers QF1, QF2, and QF3 on and off, ensuring an uninterrupted power supply to the load. In one embodiment, a fuse FU1 is connected in series on the main circuit connecting the first incoming line cabinet and the first busbar.

[0027] Specifically, when a fault occurs in the first busbar, and the current in the circuit exceeds the rated value, the circuit is disconnected. The circuit status is monitored in real time through the fuse to ensure the stable operation of the power grid. For example, when the first busbar experiences problems such as short circuit, overload, poor contact, or aging and deterioration, the fuse will short-circuit, thus protecting the stable operation of the power grid.

[0028] In one embodiment, the first incoming line cabinet is provided with a first current transformer, which is connected in parallel with the cable or busbar.

[0029] Specifically, the first current transformer converts the high current in the incoming line cabinet into a low current signal for use by secondary equipment. It provides a signal source for energy metering, equipment monitoring, relay protection, and safety isolation, ensuring the safe and stable operation of the power system. In one embodiment, a fuse FU2 is connected in series on the main circuit between the second incoming line cabinet and the second busbar.

[0030] Specifically, when a fault occurs on the second busbar, and the current in the circuit exceeds the rated value, the circuit is disconnected. The circuit status is monitored in real time through the fuse to ensure the stable operation of the power grid. For example, when the second busbar experiences problems such as short circuit, overload, poor contact, or aging and deterioration, the fuse will short-circuit, thus protecting the stable operation of the power grid.

[0031] In one embodiment, a second current transformer is provided on the second incoming line cabinet, and the second current transformer is connected in parallel with the cable or busbar.

[0032] Specifically, the second current transformer converts the high current in the incoming line cabinet into a low current signal for use by secondary equipment. It provides a signal source for energy metering, equipment monitoring, relay protection, and safety isolation, ensuring the safe and stable operation of the power system. In one embodiment, an indicator light is provided.

[0033] Specifically, indicator lights are installed to provide alarm and recording functions for abnormal situations.

[0034] In one embodiment, the bus tie cabinet ML further includes an electromagnetic switch KA and a common terminal COM, wherein the common terminal COM and the electromagnetic switch KA are connected to the incoming line cabinet.

[0035] Specifically, the common terminal is used to realize circuit loop connection and ensure equipment safety.

[0036] In one embodiment, the bus tie cabinet ML is further provided with a current transformer TA, which is connected to the first bus or the second bus via a cable or busbar.

[0037] Specifically, it can perform current transformation, converting the large current of the high-voltage line in the bus tie cabinet into a small current, facilitating instrument measurement and standardized use of relay protection devices; it can also achieve electrical isolation, transmitting current information through a small current on the secondary side to achieve electrical isolation between measuring equipment and the high-voltage bus tie cabinet, ensuring the safety of personnel and equipment. In one embodiment, a fuse is connected in parallel between the bus tie cabinet ML and the first busbar and the second busbar.

[0038] Specifically, the fuses configured between the bus tie cabinet and the first and second busbars mainly serve to protect the circuit and prevent overloads and short circuits. Their specific functions are as follows: Overload protection: When the circuit load exceeds the rated current, the fuse melts and breaks the circuit to prevent equipment damage; Short circuit protection: When a short circuit fault occurs, the fuse quickly melts and limits the impact of the short circuit current on the equipment; Bus tie cabinet operation: When switching power in the bus tie cabinet, the fuse can isolate the load between different busbars to prevent accidental power supply causing short circuits or equipment damage; Multiple power supply switching: The fuse enables safe switching between different busbars to ensure power supply stability.

[0039] In one embodiment, an intermediate relay is connected between the first bus and the second bus.

[0040] Specifically, installing an intermediate relay between the first and second busbars enables signal conversion, circuit control, and safety protection. The intermediate relay converts the control signals from the first busbar into a signal format suitable for the second busbar's requirements, achieving compatibility with different voltage or current specifications. By increasing the number and capacity of contacts, the intermediate relay can expand the control capabilities of the second busbar. For example, in industrial control systems, it is often used to switch multiple control circuits, improving system flexibility and reliability. Through isolation of circuit interference and overload protection, the intermediate relay effectively ensures the safe operation of equipment on the second busbar. For example, in power distribution systems, it can reduce the impact of voltage fluctuations on load equipment.

[0041] Beneficial effects: The bus tie controller controls two incoming line cabinets, each equipped with a circuit breaker. This ensures uninterrupted power supply to the load even if any section of the mains power fails or is interrupted. A fuse FU2 is connected in series in the main circuit between the second incoming line cabinet and the second busbar. The fuses configured between the bus tie cabinet and the first and second busbars primarily protect the circuit and prevent overloads and short circuits. The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A control bus coupling device, characterized in that, include: The bus tie cabinet ML is equipped with a bus tie controller inside; At least two incoming line cabinets are provided, including a first incoming line cabinet and a second incoming line cabinet. The first incoming line cabinet is connected to a first busbar, and the second incoming line cabinet is connected to a second busbar. The first incoming line cabinet is connected to the bus tie cabinet ML via a cable or busbar, and the second incoming line cabinet is connected to the bus tie cabinet ML via a cable or busbar. The first incoming line cabinet is equipped with a first circuit breaker QF1, and the first incoming line cabinet is connected to the bus tie controller via the first circuit breaker QF1. The second incoming line cabinet is equipped with a second circuit breaker QF2, and the second incoming line cabinet is connected to the bus tie controller via the second circuit breaker QF2. A circuit breaker QF3 is provided between the first incoming line cabinet and the second incoming line cabinet, and they are connected or disconnected via a cable or busbar. Both the first incoming line cabinet and the second incoming line cabinet are equipped with RS485 interfaces, and are electrically connected to the bus tie controller via the RS485 interfaces.

2. The control bus coupling device according to claim 1, characterized in that, A fuse FU1 is connected in series on the main circuit connecting the first incoming line cabinet and the first busbar.

3. The control bus coupling device according to claim 1, characterized in that, The first incoming line cabinet is equipped with a first current transformer, which is connected in parallel with the cable or busbar.

4. A control bus coupling device according to claim 1, characterized in that, A fuse FU2 is connected in series on the main circuit between the second incoming line cabinet and the second busbar.

5. A control bus coupling device according to claim 1, characterized in that, The second incoming line cabinet is equipped with a second current transformer, which is connected in parallel with the cable or busbar.

6. A control bus coupling device according to claim 1, characterized in that, It is equipped with indicator lights.

7. A control bus coupling device according to claim 1, characterized in that, The bus tie cabinet ML also includes an electromagnetic switch KA and a common terminal COM, which are connected to the incoming line cabinet.

8. A control bus coupling device according to claim 1, characterized in that, The bus tie cabinet ML is also equipped with a current transformer TA, which is connected to the first bus or the second bus via a cable or busbar.

9. A control bus coupling device according to claim 8, characterized in that, A fuse is connected in parallel between the bus tie cabinet ML and the first busbar and the second busbar.

10. A control bus coupling device according to claim 1, characterized in that, An intermediate relay is connected between the first busbar and the second busbar.

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