A busbar controller controls a two-stage transformer incoming line cabinet

Abstract

A bus coupling controller controls an electric cabinet of two-section transformer incoming cabinets, comprising a bus coupling cabinet and at least two incoming cabinets, each of the incoming cabinets corresponding to a transformer and connected to the bus coupling cabinet via a conductive wire, each of the incoming cabinets being provided with a circuit breaker QF, the bus coupling cabinet being provided with a bus coupling controller, the bus coupling controller being connected to each of the circuit breaker QF, so as to realize uninterrupted supply by switching on and off each incoming cabinet, the present application adds a closed-loop control mode, i.e., parallel operation of two-section transformers, in which the two-section incoming cabinets and the bus coupling cabinet are closed, even if any section of the city power fails or is out of power, the load will not be out of power, ensuring that the load is not out of power when any transformer fails or is planned for maintenance.

Description

Technical Field

[0001] The utility model relates to the field of electric cabinets, in particular to an electric cabinet for controlling two-section transformer incoming cabinets by a busbar controller. Background Art

[0002] In the prior art, most of the power supply methods use two incoming lines and one busbar, which can only be realized by manual or automatic switching devices. Under normal circumstances, the two sections of the busbar are powered by their own transformers. When a problem occurs in the transformer or the medium voltage side of a section of the incoming line, such as a serious voltage sag (undervoltage or loss of voltage) or a fault, the incoming line circuit breaker of this section is opened, and then the bus tie circuit breaker is closed. When the system is restored, the bus tie circuit breaker needs to be opened and then the incoming line circuit breaker of this section needs to be closed again. This method is simple, but the load on the busbar, such as the motor, needs to experience a power outage and restart again after experiencing a power outage and restart. Utility Model Content

[0003] In order to solve the above problems, the present technical solution provides a busbar controller to control an electric cabinet of two-section transformer incoming cabinets.

[0004] To achieve the above purpose, the technical solution is as follows:

[0005] A bus coupling controller controls an electric cabinet of two-section transformer incoming cabinets, comprising a bus coupling cabinet and at least two incoming cabinets, each of which corresponds to a transformer and is connected to the bus coupling cabinet via a conductive line, each of which is provided with a circuit breaker QF, and the bus coupling cabinet is provided with a bus coupling controller, which is connected to each of the circuit breaker QF to achieve uninterrupted supply by switching each incoming cabinet on and off.

[0006] In some embodiments, the bus tie controller includes a switching switch 1SA connected to the incoming line cabinet, the switching switch 1SA is connected to a closing-loop control switch SA, and the closing-loop control switch SA is connected to a bus tie automatic switching controller HATS.

[0007] In some embodiments, the current detection terminal of the bus tie automatic switching controller HATS is connected to the incoming line cabinet for collecting current; the voltage detection terminal of the bus tie automatic switching controller HATS is connected to the incoming line cabinet for collecting voltage.

[0008] The beneficial effects of this application are:

[0009] The present application adds a closed-loop control mode, that is, the parallel operation of two-section transformers. In the case of parallel operation, the two-section incoming line cabinets and the busbar cabinets are closed. Even if any section of the mains fails or a power outage occurs, the load will not be powered off, ensuring that the load will not be disconnected when any transformer fails or is planned for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0011] Figure 1 It is a schematic diagram of the electrical structure of an embodiment of the utility model;

[0012] Figure 2 This is a circuit diagram of an incoming line cabinet in an embodiment of the utility model;

[0013] Figure 3 It is another circuit diagram of the incoming line cabinet of an embodiment of the utility model;

[0014] Figure 4 This is a schematic diagram of the circuit structure of a mother coupling cabinet according to an embodiment of the utility model;

[0015] Figure 5 It is a schematic diagram of the circuit structure of the bus coupling controller of an embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] Please refer to Figure 1-5 As shown, a bus coupling controller controls an electrical cabinet of two-section transformer incoming cabinets, including a bus coupling cabinet and at least two incoming cabinets, each of which corresponds to a transformer and is connected to the bus coupling cabinet through a conductive wire, each of which is provided with a circuit breaker QF, and the bus coupling cabinet is provided with a bus coupling controller, which is connected to each of the circuit breaker QF to achieve uninterrupted supply by switching each incoming cabinet on and off.

[0018] In this embodiment, the bus tie controller includes a switching switch 1SA connected to the incoming line cabinet, the switching switch 1SA is connected to a closing control switch SA, and the closing control switch SA is connected to a bus tie automatic switching controller HATS.

[0019] In this embodiment, the current detection terminal of the bus tie automatic switching controller HATS is connected to the incoming line cabinet for collecting current; the voltage detection terminal of the bus tie automatic switching controller HATS is connected to the incoming line cabinet for collecting voltage.

[0020] In low-voltage power distribution, due to the importance of many electrical equipment, when one of the transformers in parallel operation is damaged, it needs to be quickly removed from the power grid, and the other or two transformers can still ensure the normal power supply of the electrical equipment; when a transformer is repaired, it does not affect the normal operation of other transformers, thereby reducing the scope and number of power outages during failures and maintenance, and improving power supply reliability. Secondly, the parallel operation of transformers also improves the economy of transformer operation. When the load of electrical equipment increases to the point where the capacity of one transformer is insufficient, the second transformer can be put into parallel operation, and when the load is reduced to the point where two transformers are not needed to supply power at the same time, one transformer can be withdrawn from operation. Especially in lithium battery material factories, seasonal electricity consumption is obvious. Transformers in parallel operation can be switched on and off according to the size of the power load. In this way, the loss of the transformer itself can be minimized to achieve the purpose of economic operation.

[0021] The technical problems to be solved by this application are:

[0022] 1. When running in parallel, close the two sections of incoming lines and bus tie circuit breakers. When one section fails or is shut down for maintenance, the other section of the transformer can still supply power to the load, realizing non-stop switching of the power grid and ensuring the power supply of important electrical equipment;

[0023] 2. When the load increases to the point where the capacity of one transformer is insufficient, a second transformer can be put into parallel operation. When the load decreases to the point where two transformers are no longer needed to supply power at the same time, one transformer can be taken out of operation.

[0024] The switching principle of the bus coupling controller: two switching switches of "manual / stop / automatic / remote control" and "three-in-two / closed loop" are set in the bus coupling cabinet. The bus coupling controller is set in the bus coupling cabinet. The bus coupling controller needs to collect the "voltage, current, switch status, fault status" signals of the two incoming lines and the position signals of the two switching switches of the bus coupling cabinet. The opening and closing signals of the bus coupling controller are connected to the opening and closing circuits of the two incoming cabinets and the bus coupling cabinet through the interconnecting line.

[0025] Bus tie controller switching logic:

[0026] 1. Under normal circumstances, two power supplies work at the same time and serve as backup for each other, and the bus tie circuit breaker is in the open state. The 1# and 2# incoming lines and bus tie switches are three-in-two electrically interlocked. When one power supply fails, the bus tie switch can be manually / automatically / remotely switched on. The first transfer switch is set to the manual position; the incoming bus tie can be opened and closed manually by the button, and the bus tie controller does not operate; the first transfer switch is set to the remote control position; the incoming bus tie can be opened and closed by communication, and the bus tie controller does not operate;

[0027] 2. In the case of split operation: the first conversion switch is turned to automatic gear; the second conversion switch is turned to three-in-two gear:

[0028] a. Under normal circumstances, the two power supplies work at the same time and serve as backup for each other, and the main circuit breaker is in the open state.

[0029] b. When the T1 (T2) transformer fails and loses power, the bus coupling controller issues a command to disconnect the 1# / 2# incoming line. After confirming the disconnection, the bus coupling is closed after a delay of 10 seconds;

[0030] c. When the power supply of T1 (T2) transformer is restored, the bus coupling controller issues a command to disconnect the bus coupling. After confirming the disconnection, the 1# / 2# incoming line is closed to restore normal operation;

[0031] 3. Under parallel operation: the first conversion switch is turned to the automatic gear; the second conversion switch is turned to the closing gear. When the low-voltage incoming line main switches of T1 (T2) transformers are in the closed state, the bus coupling controller detects the frequency and phase synchronization of the two incoming line voltages and closes the bus coupling switch.

[0032] 4. The separate operation and parallel operation modes of the bus tie controller can be selected separately.

[0033] refer to Figure 5 Under normal circumstances, the two power supplies work at the same time and serve as backup for each other. The bus tie circuit breaker is in the open state, and the incoming line and busbar switches are three-in-two electrically interlocked. When one power supply fails, the bus tie switch can be manually, automatically or remotely switched on, and the 1SA transfer switch is in the manual position; the incoming line bus tie can be manually opened and closed by the button, and the HATS will not work; the 1SA transfer switch is in the remote control position, and the incoming line bus tie can be opened and closed by communication, and the HATS will not work;

[0034] In the case of split operation, the 1SA switch is turned to the automatic gear, and the SA switch is turned to the three-in-two gear:

[0035] A. Under normal circumstances, the two power supplies work at the same time and serve as backup for each other, and the bus tie circuit breaker is in the open state;

[0036] B. When the T1 transformer fails and loses power, HATS issues a command to disconnect the 1 or 2 incoming lines. After confirming the disconnection, it delays 10 seconds to close the busbar.

[0037] C. When the power supply of transformer T1 is restored, HATS issues a command to disconnect the denominator. After confirming the disconnection, close the 1 or 2 incoming line to restore normal operation.

[0038] D. In parallel operation: 1SA transfer switch is turned to automatic gear; SA transfer switch is turned to closing gear. When the main switches of the low-voltage incoming lines of T1 transformer are all in the closed state, HATS detects frequency and phase synchronization and then closes the bus tie switch.

[0039] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application. Other principles and basic structures that are the same or similar to those of the present application are within the protection scope of the present application.

Claims

1. A busbar controller controls a cabinet of two-stage transformer incoming line cabinets, characterized in that: It includes a bus coupling cabinet and at least two incoming line cabinets, each of which corresponds to a transformer and is connected to the bus coupling cabinet through a conductive line. Each incoming line cabinet is provided with a circuit breaker QF, and the bus coupling cabinet is provided with a bus coupling controller, which is connected to each circuit breaker QF, so that each incoming line cabinet can be turned on and off to achieve uninterrupted supply; The bus tie controller comprises a switching switch 1SA connected to the incoming line cabinet, the switching switch 1SA is connected to a closing-loop control switch SA, and the closing-loop control switch SA is connected to a bus tie automatic switching controller HATS.

2. A busbar controller according to claim 1 controls an electric cabinet of two-stage transformer incoming line cabinets, characterized in that: The current detection terminal of the bus tie automatic switching controller HATS is connected to the incoming line cabinet for collecting current; the voltage detection terminal of the bus tie automatic switching controller HATS is connected to the incoming line cabinet for collecting voltage.

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