Automatic control system

Abstract

The present invention provides a standby automatic switching control system, comprising: a first main incoming line distribution cabinet and a busbar cabinet, wherein the first main incoming line distribution cabinet comprises a first distribution terminal and a first switch device connected thereto, the busbar cabinet comprises a second distribution terminal and a busbar switch, the busbar switch is respectively connected to the first main incoming line, the second main incoming line and the second distribution terminal, when the first main incoming line and the second main incoming line are both operating normally, the first switch device is in a closed state, and the busbar switch is in an open state; when the first distribution terminal detects that the first main incoming line loses power, the first switch device is controlled to be disconnected, and a first signal for indicating that the first main incoming line loses power is sent to the second distribution terminal; after receiving the first signal, the second distribution terminal detects whether the second main incoming line has power, and if so, controls the busbar switch to be closed. Through the present invention, accurate and timely automatic switching is achieved when power is cut off at the primary distribution point, ensuring the stability and safety of the low-voltage power distribution system.

Description

Technical Field

[0001] The invention relates to the technical field of power electronics, and in particular to a standby automatic switching control system. Background Art

[0002] With the development of modern technology, there are more and more high-rise buildings, and the electrical equipment of various enterprises is becoming more and more complex. As a result, higher requirements are placed on the safety, reliability and intelligent management of low-voltage distribution systems.

[0003] Generally, the current low-voltage power distribution industry uses manual switching for incoming line switching. However, this method has a long power-off interval and is unsafe, thus failing to ensure the stability and safety of the low-voltage power distribution system. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a standby automatic switching control system to achieve accurate and timely automatic switching when power is cut off at the primary distribution point, thereby ensuring the stability and safety of the low-voltage distribution system.

[0005] To achieve the above-mentioned purpose of the invention, an embodiment of the present invention provides a standby automatic control system for a low-voltage distribution network, wherein the low-voltage distribution network includes a first main incoming line and a second main incoming line, and the system includes: a first main incoming line distribution cabinet and a bus tie cabinet, wherein the first main incoming line distribution cabinet includes a first distribution terminal and a first switch device connected thereto, and the bus tie cabinet includes a second distribution terminal and a bus tie switch, and the bus tie switch is respectively connected to the first main incoming line, the second main incoming line and the second distribution terminal. When the first main incoming line and the second main incoming line are operating normally, the first switch device is in a closed state and the bus tie switch is in an open state; when the first distribution terminal detects that the first main incoming line loses power, it controls the first switch device to be disconnected and sends a first signal for indicating that the first main incoming line loses power to the second distribution terminal; after receiving the first signal, the second distribution terminal detects whether the second main incoming line has power, and if so, controls the bus tie switch to be closed, so that the second main incoming line supplies power to the electrical equipment connected to the incoming line of the first main incoming line.

[0006] Preferably, the system further comprises a second main incoming power distribution cabinet, a mains incoming power cabinet and a diesel generator incoming power cabinet, wherein the second main incoming power distribution cabinet comprises a third power distribution terminal and a second switch device connected thereto, the mains incoming power cabinet comprises a fourth power distribution terminal and a third switch device connected thereto, and the diesel generator incoming power cabinet comprises a fifth power distribution terminal and a fourth switch device connected thereto;

[0007] When the third power distribution terminal detects that the second main incoming line loses power, it controls the second switch device to disconnect, and sends a second signal for indicating that the second main incoming line loses power to the fourth power distribution terminal and the fifth power distribution terminal respectively;

[0008] After receiving the second signal, the fourth power distribution terminal controls the third switch device to be disconnected;

[0009] After receiving the second signal, the fifth power distribution terminal controls the fourth switch device to close and controls the start-up of the diesel generator so that the diesel generator supplies power to the emergency load in the low-voltage distribution network.

[0010] Preferably, when the third power distribution terminal detects that the second main incoming line is powered and the power-on time exceeds a set time threshold, the second switch device is controlled to close, and a third signal indicating that the second main incoming line is powered is sent to the fourth power distribution terminal and the fifth power distribution terminal respectively;

[0011] After receiving the third signal, the fifth power distribution terminal controls the fourth switch device to be disconnected, and controls the diesel generator to stop running;

[0012] After receiving the third signal, the fourth power distribution terminal controls the third switch device to close.

[0013] Preferably, when the first power distribution terminal detects that the first main incoming line is powered and the power-on time exceeds a set time threshold, the fourth signal used to indicate that the first main incoming line is powered is sent to the second power distribution terminal;

[0014] After receiving the fourth signal, the second distribution terminal controls the bus tie switch to open, and sends a fifth signal to the first distribution terminal to indicate that the bus tie switch is open, so that the first distribution terminal controls the first switch device to close after receiving the fifth signal.

[0015] Preferably, at least one of the first switch device, the second switch device, the third switch device and the fourth switch device is a circuit breaker.

[0016] Preferably, at least one of the first power distribution terminal, the second power distribution terminal, the third power distribution terminal, the fourth power distribution terminal and the fifth power distribution terminal is a digital power distribution terminal.

[0017] Preferably, the system further comprises: a host computer communicatively connected to the first power distribution terminal, the second power distribution terminal, the third power distribution terminal, the fourth power distribution terminal and the fifth power distribution terminal respectively.

[0018] Preferably, the host computer is used to receive a notification signal for characterizing a power distribution fault sent by at least one of the first power distribution terminal, the second power distribution terminal, the third power distribution terminal, the fourth power distribution terminal and the fifth power distribution terminal.

[0019] Preferably, when the first power distribution terminal detects that the first main incoming line loses power, an alarm message is prompted on the first power distribution terminal; and / or,

[0020] When the third power distribution terminal detects that the second main incoming line loses power, an alarm message is prompted on the third power distribution terminal.

[0021] Preferably, the alarm information is alarm information for demonstration on the first power distribution terminal and / or the second power distribution terminal.

[0022] The standby automatic switching control system provided in the embodiment of the present invention is provided by setting a first main incoming line distribution cabinet and a bus coupling cabinet in the low-voltage distribution network, wherein the first main incoming line distribution cabinet is provided with a first distribution terminal and a first switch device connected thereto, and the bus coupling cabinet is provided with a second distribution terminal and a bus coupling switch. When the first distribution terminal detects that the first main incoming line loses power, the first switch device is controlled to disconnect, and a signal is sent to the second distribution terminal to inform it of the power failure. Further, after receiving a signal, the second distribution terminal detects whether there is power in the second main incoming line. If there is power, the bus coupling switch is controlled to close, so as to use the second main incoming line to supply power to the electrical equipment connected to the first main incoming line. Thereby, accurate and timely automatic switching is achieved when power is cut off at the primary distribution point, thereby ensuring the stability and safety of the low-voltage distribution system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the automatic switching control system of the first embodiment of the present invention; for ease of understanding, the figure shows the electrical equipment;

[0024] Figure 2 This is a schematic diagram of the structure of the automatic backup control system of the second embodiment of the present invention; for ease of understanding, the figure shows electrical equipment, diesel generators and emergency loads. DETAILED DESCRIPTION

[0025] The following is a detailed description of the automatic switching control system according to an embodiment of the present invention in conjunction with the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present invention are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0027] Embodiment 1

[0028] Figure 1 This is a schematic diagram of the structure of the automatic control system of the first embodiment of the present invention, referring to Figure 1 The automatic standby control system is used for a low-voltage distribution network. The low-voltage distribution network includes a first main incoming line and a second main incoming line. The automatic standby control system includes: a first main incoming line distribution cabinet 110 and a bus coupling cabinet 120, wherein the first main incoming line distribution cabinet 110 includes a first distribution terminal 111 and a first switch device 112 connected thereto, and the bus coupling cabinet 120 includes a second distribution terminal 121 and a bus coupling switch 122. The bus coupling switch 122 is respectively connected to the first main incoming line, the second main incoming line and the second distribution terminal 121. When the first main incoming line and the second main incoming line are both positive During normal operation, the first switch device 112 is in a closed state and the bus tie switch 122 is in an open state; when the first distribution terminal 111 detects that the first main incoming line loses power, it controls the first switch device 112 to be opened, and sends a first signal for indicating that the first main incoming line has lost power to the second distribution terminal 121; after receiving the first signal, the second distribution terminal 121 detects whether the second main incoming line has power, and if so, controls the bus tie switch 122 to be closed, so that the second main incoming line can supply power to the electrical equipment connected to the incoming line of the first main incoming line.

[0029] In actual applications, the first main incoming line and the second main incoming line operate independently during normal operation and serve as backup for each other. The bus tie switch 122 connects the two bus sections of the first main incoming line and the second main incoming line. At this time, the first switch device 112 connected to the first power distribution terminal 111 is in a closed state, and the bus tie switch 122 is in an open state. When the first main incoming line loses power and the second main incoming line operates normally, when the first power distribution terminal 111 in the first main incoming line distribution cabinet 110 detects that the first main incoming line power supply has lost power, the first power distribution terminal 111 controls the first switch device 112 to disconnect or the first switch device 112 equipped with an undervoltage protection device disconnects autonomously. The first power distribution terminal 111 communicates with the second power distribution terminal 121 through the CAN bus and sends a signal to the second power distribution terminal 121 in the bus tie cabinet 120. The second power distribution terminal 121 in the busbar cabinet 120 (which can monitor the electrical parameters at both ends of the busbar switch at the same time) detects that the second main incoming line has power, and the second power distribution terminal 121 controls the busbar switch 122 to close, and the second main incoming line supplies power to the electrical equipment on the two incoming lines. At the same time, the screen of the first power distribution terminal 111 flashes to indicate that an event has occurred, and the standby automatic switching is completed. In addition, if the first power distribution terminal 111 detects that the reason for the loss of power in the first main incoming line is a fault trip, it will not automatically switch. The safety of the system power supply is guaranteed.

[0030] The standby automatic switching control system provided in the embodiment of the present invention is provided by setting a first main incoming line distribution cabinet and a bus coupling cabinet in the low-voltage distribution network, wherein the first main incoming line distribution cabinet is provided with a first distribution terminal and a first switch device connected thereto, and the bus coupling cabinet is provided with a second distribution terminal and a bus coupling switch. When the first distribution terminal detects that the first main incoming line loses power, the first switch device is controlled to disconnect, and a signal is sent to the second distribution terminal to inform it of the power failure. Further, after receiving a signal, the second distribution terminal detects whether there is power in the second main incoming line. If there is power, the bus coupling switch is controlled to close, so as to use the second main incoming line to supply power to the electrical equipment connected to the first main incoming line. Thereby, accurate and timely automatic switching is achieved when power is cut off at the primary distribution point, thereby ensuring the stability and safety of the low-voltage distribution system.

[0031] Embodiment 2

[0032] Figure 2 Schematic diagram of the structure of the automatic switching control system of the second embodiment of the present invention. Figure 1 A specific implementation of the device embodiment shown in FIG. Figure 2 ,compared to Figure 1 The device structure of the device embodiment shown, Figure 2 The figure shows a second main incoming distribution cabinet 130, a city power incoming cabinet 140, a diesel generator incoming cabinet 150, a third distribution terminal 131, a fourth distribution terminal 141, a fifth distribution terminal 151, a second switch device 132, a third switch device 142 and a fourth switch device 152.

[0033] Specifically, the standby automatic control system can also include a second main incoming line distribution cabinet 130, a mains incoming line cabinet 140 and a diesel generator incoming line cabinet 150, wherein the second main incoming line distribution cabinet 130 includes a third distribution terminal 131 and a second switch device 132 connected thereto, the mains incoming line cabinet 140 includes a fourth distribution terminal 141 and a third switch device 142 connected thereto, and the diesel generator incoming line cabinet 150 includes a fifth distribution terminal 151 and a fourth switch device 152 connected thereto.

[0034] When the third distribution terminal 131 detects that the second main incoming line has lost power, it controls the second switch device 132 to be disconnected, and sends a second signal for indicating the loss of power to the second main incoming line to the fourth distribution terminal 141 and the fifth distribution terminal 151 respectively; after receiving the second signal, the fourth distribution terminal 141 controls the third switch device 142 to be disconnected; after receiving the second signal, the fifth distribution terminal 151 controls the fourth switch device 152 to be closed, and controls the start-up of the diesel generator so that the diesel generator can supply power to the emergency loads in the low-voltage distribution network.

[0035] When the third power distribution terminal 131 detects that the second main incoming line is powered and the power-on time exceeds the set time threshold, the second switch device 132 is controlled to close, and the third signal used to indicate that the second main incoming line is powered is sent to the fourth power distribution terminal 141 and the fifth power distribution terminal 151 respectively; after receiving the third signal, the fifth power distribution terminal 151 controls the fourth switch device 152 to open and controls the diesel generator to stop running; after receiving the third signal, the fourth power distribution terminal 141 controls the third switch device 142 to close. It should be noted that after the fourth switch device 152 is opened, the third switch device 142 is closed last.

[0036] When the first distribution terminal 111 detects that the first main incoming line is energized and the energization time exceeds the set time threshold, it sends a fourth signal to the second distribution terminal 121 to indicate that the first main incoming line is energized; after receiving the fourth signal, the second distribution terminal 121 controls the main coupling switch 122 to disconnect, and sends a fifth signal to the first distribution terminal 111 to indicate that the main coupling switch 122 is disconnected, so that the first distribution terminal 111 controls the first switch device 112 to close after receiving the fifth signal.

[0037] Preferably, at least one of the first switch device 112 , the second switch device 132 , the third switch device 142 and the fourth switch device 152 may be a circuit breaker.

[0038] Further, at least one of the first power distribution terminal 111 , the second power distribution terminal 121 , the third power distribution terminal 131 , the fourth power distribution terminal 141 and the fifth power distribution terminal 151 may be a digital power distribution terminal.

[0039] Optionally, the standby automatic control system further includes: a host computer 160 which is communicatively connected to the first power distribution terminal 111, the second power distribution terminal 121, the third power distribution terminal 131, the fourth power distribution terminal 141 and the fifth power distribution terminal 151 respectively.

[0040] Furthermore, the host computer 160 is used to receive a notification signal for characterizing a power distribution fault sent by at least one of the first power distribution terminal 111 , the second power distribution terminal 121 , the third power distribution terminal 131 , the fourth power distribution terminal 141 and the fifth power distribution terminal 151 .

[0041] Furthermore, when the first power distribution terminal 111 detects that the first main incoming line loses power, an alarm message is prompted on the first power distribution terminal 111; and / or when the third power distribution terminal 131 detects that the second main incoming line loses power, an alarm message is prompted on the third power distribution terminal 131. It should be noted that the alarm message may be an alarm message for demonstration on the first power distribution terminal 111 and / or the second power distribution terminal 131.

[0042] In a specific implementation, after the first main incoming line loses power, when the second main incoming line also loses power, the third distribution terminal 131 in the second main incoming line distribution cabinet 130 detects that the incoming line also loses power, and the second switch device 132 and the first switch device 112 are disconnected due to the same reason, then the third distribution terminal 131 sends a signal to the fourth distribution terminal 141 in the main power incoming line cabinet 140 and the fifth distribution terminal 151 at the front end of the diesel generator through the CAN bus, the fourth distribution terminal 141 controls the third switch device 142 to disconnect, the fifth distribution terminal 151 controls the fourth switch device 152 to close, and controls the diesel generator to start, so that the diesel generator supplies power to the emergency load to ensure the continuity of the emergency load. It should be noted that the emergency load is an important equipment in the low-voltage distribution network, mainly including fire hydrant pumps for fire fighting, emergency lighting, fire smoke exhaust fans, fire shutter doors, fire monitors, etc. The loss of power to the emergency load will cause huge property losses or accidents. Therefore, when both the first main incoming line and the second main incoming line lose power, it is necessary to supply power to the important equipment, namely the emergency load. At the same time, the screen of the third power distribution terminal 131 flashes an alarm prompt, indicating that a power outage has occurred.

[0043] In the case of diesel generator power supply, when the third power distribution terminal 131 in the second main incoming line distribution cabinet 130 detects that the second main incoming line has power, and after a delay, the third power distribution terminal 131 controls the second switch device 132 in the second main incoming line to close. The fifth power distribution terminal 151 in the diesel generator incoming line cabinet 150 controls the fourth switch device 152 to open, and controls the diesel generator to stop running, and the fourth power distribution terminal 141 controls the third switch device 142 in the mains power distribution cabinet 140 to close. At this time, the bus tie switch 122 is in a closed state.

[0044] When the circuit is powered only by the second main incoming line, if the first distribution terminal 111 on the first main incoming line detects that there is power in the first main incoming line, and after a delay, the second distribution terminal 121 controls the disconnection of the bus tie switch 122. After the first distribution terminal 111 determines that the bus tie switch 122 is disconnected through communication with the second distribution terminal 121, it controls the first switch device 112 of the first main incoming line to close, thereby completing the recovery of the standby automatic transfer.

[0045] It should be noted that the first distribution terminal 111 on the first main incoming line and the third distribution terminal 131 on the second main incoming line are both located at the front end of the corresponding first switch device 112 and the second switch device 132 (i.e., circuit breakers). Therefore, the backup automatic switching control process will only be started when the power grid is out of power. If the first distribution terminal 111 or the third distribution terminal 131 detects that the cause of the power failure of the corresponding main incoming line circuit breaker is a fault trip, automatic switching will not be performed, thereby ensuring the safety of the system power supply.

[0046] In addition, the mains power incoming line cabinet 140 is a busbar, and there is a third switch device 142, that is, a circuit breaker, in the cabinet. When the mains power incoming line is powered by the busbar, this circuit breaker is closed, and the mains power incoming line cabinet is connected to the emergency load and the diesel generator.

[0047] The automatic standby control system provided by the embodiment of the present invention has the following technical effects based on the above embodiment:

[0048] On the one hand, during normal operation, the first main incoming line and the second main incoming line operate independently and serve as backup for each other. When one of the incoming lines loses power, the busbar switch is closed, and the electrical equipment on the incoming line is powered by the other incoming line. When both incoming lines lose power, the circuit breaker in the mains incoming line cabinet is disconnected, and the diesel generator is started to supply power to the emergency load, thereby ensuring the continuity of the emergency load operation;

[0049] On the other hand, the first main incoming line distribution cabinet, the second main incoming line distribution cabinet, the busbar cabinet, the mains incoming line cabinet, and the diesel generator incoming line cabinet are added on the basis of the original power distribution system. Among them, digital distribution terminals are installed in the cabinets, and the digital distribution terminals are connected to the corresponding circuit breakers. Each digital distribution terminal can collect data such as current and voltage and analyze and judge them. The digital distribution terminals communicate through the CAN bus and can also control the action of the protection switch device (i.e., circuit breaker) of the corresponding distribution line. To ensure the continuity and safety of the system power supply. In addition, the digital distribution terminal can locate the location of the fault and display it on the upper machine, which is convenient for maintenance personnel to repair the fault.

[0050] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A standby automatic control system for a low voltage distribution network, the low voltage distribution network comprising a first main incoming line and a second main incoming line, characterized in that: The system comprises: a first main incoming line distribution cabinet and a bus coupling cabinet, wherein the first main incoming line distribution cabinet comprises a first distribution terminal and a first switch device connected thereto, the bus coupling cabinet comprises a second distribution terminal and a bus coupling switch, the bus coupling switch is respectively connected to the first main incoming line, the second main incoming line and the second distribution terminal, and when the first main incoming line and the second main incoming line are operating normally, the first switch device is in a closed state, and the bus coupling switch is in an open state; When the first power distribution terminal detects that the first main incoming line loses power, it controls the first switch device to be disconnected, and sends a first signal indicating that the first main incoming line loses power to the second power distribution terminal; After receiving the first signal, the second power distribution terminal detects whether the second main incoming line has power, and if so, controls the bus tie switch to close, so that the second main incoming line supplies power to the electrical equipment connected to the incoming line of the first main incoming line. The system further comprises a second main incoming power distribution cabinet, a mains incoming power cabinet and a diesel generator incoming power cabinet, wherein the second main incoming power distribution cabinet comprises a third power distribution terminal and a second switch device connected thereto, and the first power distribution terminal and the second power distribution terminal communicate via a CAN controller local area network bus, the mains incoming power cabinet comprises a fourth power distribution terminal and a third switch device connected thereto, and the diesel generator incoming power cabinet comprises a fifth power distribution terminal and a fourth switch device connected thereto; When the third power distribution terminal detects that the second main incoming line loses power, it controls the second switch device to disconnect, and sends a second signal for indicating that the second main incoming line loses power to the fourth power distribution terminal and the fifth power distribution terminal respectively; After receiving the second signal, the fourth power distribution terminal controls the third switch device to be disconnected; After receiving the second signal, the fifth power distribution terminal controls the fourth switch device to close and controls the diesel generator to start, so that the diesel generator supplies power to the emergency load in the low-voltage distribution network. When the third power distribution terminal detects that the second main incoming line is powered and the power-on time exceeds a set time threshold, the second switch device is controlled to close, and a third signal indicating that the second main incoming line is powered is sent to the fourth power distribution terminal and the fifth power distribution terminal respectively; After receiving the third signal, the fifth power distribution terminal controls the fourth switch device to be disconnected, and controls the diesel generator to stop running; After receiving the third signal, the fourth power distribution terminal controls the third switch device to close.

2. The automatic backup control system according to claim 1, characterized in that: When the first power distribution terminal detects that the first main incoming line is powered and the power-on time exceeds a set time threshold, the first power distribution terminal sends a fourth signal for indicating that the first main incoming line is powered to the second power distribution terminal; After receiving the fourth signal, the second distribution terminal controls the bus tie switch to open, and sends a fifth signal to the first distribution terminal to indicate that the bus tie switch is open, so that the first distribution terminal controls the first switch device to close after receiving the fifth signal.

3. The automatic backup control system according to claim 2, characterized in that: At least one of the first switch device, the second switch device, the third switch device and the fourth switch device is a circuit breaker.

4. The automatic backup control system according to claim 2 or 3, characterized in that: At least one of the first power distribution terminal, the second power distribution terminal, the third power distribution terminal, the fourth power distribution terminal and the fifth power distribution terminal is a digital power distribution terminal.

5. The automatic switching control system according to claim 2, characterized in that: The system further includes: a host computer that is communicatively connected to the first power distribution terminal, the second power distribution terminal, the third power distribution terminal, the fourth power distribution terminal, and the fifth power distribution terminal, respectively.

6. The automatic backup control system according to claim 5, characterized in that: The host computer is used to receive a notification signal for indicating a power distribution fault sent by at least one of the first power distribution terminal, the second power distribution terminal, the third power distribution terminal, the fourth power distribution terminal and the fifth power distribution terminal.

7. The automatic backup control system according to claim 1, characterized in that: When the first power distribution terminal detects that the first main incoming line loses power, an alarm message is prompted on the first power distribution terminal; and / or, When the third power distribution terminal detects that the second main incoming line loses power, an alarm message is prompted on the third power distribution terminal.

8. The automatic backup control system according to claim 7, characterized in that: The alarm information is alarm information used for demonstration on the first power distribution terminal and / or the second power distribution terminal.

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