Three-incoming-line two-buscouple power supply system

Abstract

The utility model relates to a three incoming line two bus coupler power supply system, the three incoming line two bus coupler power supply system comprises three buses, three incoming line circuit breakers, two bus coupler circuit breakers, a PLC processor and an operation change-over switch, the three incoming line circuit breakers are in one-to-one correspondence with the three buses, and the incoming line circuit breakers are connected with the corresponding buses. And the two bus tie circuit breakers are respectively connected between two adjacent buses and are interlocked with the corresponding inlet wire circuit breakers. And the operation change-over switch is connected with the PLC processor and is used for switching the operation mode of the three-incoming-wire two-buscouple power supply system, so that the incoming-wire circuit breakers and the corresponding buscouple circuit breakers are automatically switched and / or reset when the voltage of the incoming-wire side is abnormal. Through cooperation of the operation change-over switch and the PLC processor, flexible and changeable operation modes can be provided for the three-incoming-line two-bus-coupler power supply system so as to be suitable for various application scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power distribution, in particular to a three-incoming-line and two-bus-connected power supply system. Background Art

[0002] The continuity requirements of line power supply for Class I and Class II power supply loads are particularly important, and some adopt dual-circuit or even three-circuit power supply lines. The traditional method uses a large number of relay contactor components and adopts complex logic methods to realize the mutual switching between the incoming lines. The wiring of a large number of intermediate relays increases the number of fault points and also increases the risk of system instability. The reference of industrial programmable processors PLC and human-machine interfaces has better solved such problems. PLC can not only handle the complex control relationship between multiple circuits, but also upload the working status of the equipment to the HMI to realize the visualization of the operation of the entire power supply system. However, the existing three-incoming and two-bus power supply system has a single operation mode and cannot be well applied to a variety of application scenarios. Summary of the invention

[0003] The purpose of the utility model is to provide a three-input-two-bus power supply system, which has flexible and changeable operation modes and can be applied to a variety of application scenarios.

[0004] In order to achieve the above object, the utility model provides a three-input two-bus power supply system, comprising:

[0005] Three busbars;

[0006] Three incoming circuit breakers correspond to the three busbars one by one, and the incoming circuit breakers are connected to the corresponding busbars;

[0007] Two bus tie circuit breakers, respectively connected between two adjacent busbars and interlocked with the corresponding incoming line circuit breakers;

[0008] PLC processor;

[0009] An operation conversion switch is connected to the PLC processor and is used to switch the operation mode of the three-incoming-line and two-bus-tie power supply system so that the incoming-line circuit breaker and the corresponding bus-tie circuit breaker are automatically switched and / or automatically restored when the incoming-line side voltage is abnormal.

[0010] Optionally, the three-input-two-bus power supply system further includes:

[0011] Three transformers, corresponding one to one with the three incoming circuit breakers, the transformers being connected to input terminals of the incoming circuit breakers;

[0012] Three incoming line cabinets, corresponding to the three incoming line circuit breakers one by one, used to carry the corresponding incoming line circuit breakers, and provided with incoming line transfer switches connected to the PLC processor and used to open and close the corresponding incoming line circuit breakers;

[0013] Two bus tie cabinets correspond one to one with the two bus tie circuit breakers and are used to carry the corresponding bus tie circuit breakers. A bus tie transfer switch connected to the PLC processor and used to open and close the corresponding bus tie circuit breaker is arranged therein.

[0014] Optionally, the incoming line transfer switch and the bus tie transfer switch are set to automatic, and the operation transfer switch is set to automatic transfer and automatic recovery.

[0015] Optionally, the incoming line transfer switch and the main coupling transfer switch are set to automatic, and the operation transfer switch is set to automatic reset.

[0016] Optionally, the incoming line transfer switch and the bus tie transfer switch are set to automatic, and the operation transfer switch is set to manual throw and automatic recovery.

[0017] Optionally, the incoming line transfer switch and the bus tie transfer switch are arranged on-site.

[0018] Optionally, the incoming line transfer switch and the bus tie transfer switch are remotely arranged.

[0019] Optionally, the three-incoming-line and two-bus-coupled power supply system is configured to readjust the load distribution so as to reduce the load to below 1250 kVA when the voltages on the two incoming-line sides are abnormal at the same time.

[0020] The beneficial effect of the utility model is that by operating the conversion switch in conjunction with the PLC processor, a flexible and changeable operating mode can be provided for the three-input two-bus power supply system to be suitable for a variety of application scenarios.

[0021] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic structural diagram of a three-input-two-bus power supply system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] See also Figure 1 A three-incoming line and two-bus tie power supply system shown in a preferred embodiment of the present application includes three busbars 1D, 2D, and 3D, three incoming line circuit breakers QF1, QF2, and QF3, two bus tie circuit breakers QF4 and QF5, a PLC processor, and an operation transfer switch. The three incoming line circuit breakers QF1, QF2, and QF3 correspond to the three busbars 1D, 3D, and 2D one by one, and the incoming line circuit breakers are connected to the corresponding busbars. The two bus tie circuit breakers are respectively connected between two adjacent busbars, that is, the bus tie circuit breaker QF4 is connected between the busbar 1D and the busbar 3D, and the bus tie circuit breaker QF5 is connected between the busbar 3D and the busbar 2D, and the bus tie circuit breaker is interlocked with the corresponding incoming line circuit breaker. The operation conversion switch is connected to the PLC processor and is used to switch the operation mode of the three-incoming line and two-bus-tie power supply system so that the incoming line circuit breaker and the corresponding bus-tie circuit breaker can automatically switch and / or automatically restore when the voltage on the incoming line side is abnormal.

[0027] According to the solution of the embodiment of the utility model, by operating the conversion switch in conjunction with the PLC processor, the operating mode of the three-input two-bus power supply system can be made flexible and changeable to suit a variety of application scenarios.

[0028] The following is a detailed description with specific embodiments:

[0029] The three-incoming-line and two-bus-coupling power supply system also includes three transformers #1TR, #2TR, #3TR, three incoming-line cabinets and two bus-coupling cabinets. The three transformers #1TR, #2TR, #3TR correspond one-to-one to the three incoming-line circuit breakers QF1, QF2, QF3, and the transformers are connected to the input ends of the incoming-line circuit breakers. The three incoming-line cabinets correspond one-to-one to the three incoming-line circuit breakers, and are used to carry the corresponding incoming-line circuit breakers, and are provided with incoming-line transfer switches connected to the PLC processor for opening and closing the corresponding incoming-line circuit breakers. The two bus-coupling cabinets correspond one-to-one to the two bus-coupling circuit breakers, and are used to carry the corresponding bus-coupling circuit breakers, and are provided with bus-coupling transfer switches connected to the PLC processor for opening and closing the corresponding bus-coupling circuit breakers.

[0030] The three-incoming-two-bus power supply system is equipped with three 0.4KV incoming lines. The incoming circuit breakers on the three incoming lines operate independently and each carries a section of the busbar load. During normal operation, the three incoming circuit breakers work simultaneously and serve as a hidden standby for each other. When one of the transformers is out of service due to maintenance or failure, the voltage on the corresponding incoming line side is abnormal. At this time, the corresponding interlocked busbar circuit breaker is put into operation and serves as a hidden standby for each other.

[0031] The three-input and two-bus power supply system has five operation modes:

[0032] Mode 1: The incoming line transfer switch and the bus tie transfer switch are set on-site, and the incoming line circuit breaker and the bus tie circuit breaker are manually operated on the cabinet surface of the incoming line cabinet and the bus tie cabinet.

[0033] Mode 2: The incoming line transfer switch and the bus tie transfer switch are set to remote locations, and the incoming line circuit breaker and the bus tie circuit breaker are remotely operated for opening and closing through I / O module communication.

[0034] In the above two modes, when the voltage on the incoming line side is abnormal, normal power supply is ensured by manually or remotely operating the opening and closing of the corresponding incoming line circuit breaker and the bus tie circuit breaker.

[0035] Mode 3: The incoming line transfer switch and the busbar transfer switch are set to automatic, and the running transfer switch is set to automatic transfer and automatic recovery.

[0036] When the system is in the automatic standby state, each incoming line cabinet detects the voltage on the incoming line side. If the voltage is normal, the incoming line circuit breaker is automatically closed, and the bus tie circuit breaker is always in the open state, that is, the three incoming line circuit breakers are closed and the two bus tie circuit breakers are open.

[0037] When the voltage on the incoming line side is abnormal, the incoming line circuit breaker on this incoming line will not be closed (automatically delayed opening), and the corresponding bus tie circuit breaker on the bus connected to this incoming line circuit breaker will be automatically closed to supply power. When the voltage on this incoming line side returns to normal, the corresponding bus tie circuit breaker will be automatically exited (that is, the bus tie circuit breaker will be automatically opened), and the incoming line circuit breaker on this incoming line will be automatically closed. If the incoming line circuit breaker is tripped due to a fault, the corresponding bus tie circuit breaker is not allowed to be automatically put into operation to avoid the expansion of the accident.

[0038] For example, when the voltage on the incoming line side of the incoming line circuit breaker QF1 is abnormal, the incoming line circuit breaker QF1 is not allowed to be closed (automatically opened), and the bus tie circuit breaker QF4 is automatically closed first. When the voltage on this incoming line side returns to normal, the bus tie circuit breaker QF4 is automatically opened and the incoming line circuit breaker QF1 is automatically closed.

[0039] Mode 4: The incoming line transfer switch and the busbar transfer switch are set to automatic, and the running transfer switch is set to automatic reset.

[0040] When the system is in the automatic standby state, each incoming line cabinet detects the voltage on the incoming line side. If the voltage is normal, the incoming line circuit breaker is automatically closed, and the bus tie circuit breaker is always in the open state, that is, the three incoming line circuit breakers are closed and the two bus tie circuit breakers are open.

[0041] When the voltage on the incoming line side is abnormal, the incoming line circuit breaker on this incoming line will not be closed (automatically delayed opening), and the corresponding bus tie circuit breaker on the bus connected to this incoming line circuit breaker will be automatically delayed to supply power. When the voltage on this incoming line side returns to normal, the corresponding bus tie circuit breaker will be manually exited (i.e., the bus tie circuit breaker will be manually opened), and the incoming line circuit breaker on this incoming line will be manually closed. If the incoming line circuit breaker is tripped due to a fault, the corresponding bus tie circuit breaker is not allowed to be automatically put into operation to avoid the expansion of the accident.

[0042] For example, when the voltage on the incoming line side of the incoming line circuit breaker QF2 is abnormal, the incoming line circuit breaker QF2 is not allowed to be closed (automatically opened), and the bus tie circuit breaker QF4 or QF5 is automatically closed first. When the voltage on this incoming line side returns to normal, the bus tie circuit breaker QF4 or QF5 is manually opened and the incoming line circuit breaker QF2 is manually closed.

[0043] Mode 5: The incoming line transfer switch and the busbar transfer switch are set to automatic, and the running transfer switch is set to manual throw and automatic recovery.

[0044] When the system is in the automatic standby state, each incoming line cabinet detects the voltage on the incoming line side. If the voltage is normal, the incoming line circuit breaker is automatically closed, and the bus tie circuit breaker is always in the open state, that is, the three incoming line circuit breakers are closed and the two bus tie circuit breakers are open.

[0045] When the voltage on the incoming line side is abnormal, the incoming line circuit breaker on this incoming line will not be closed (manual delay opening), and the corresponding bus tie circuit breaker on the bus connected to this incoming line circuit breaker will be manually delayed to supply power. When the voltage on this incoming line side returns to normal, the corresponding bus tie circuit breaker will be automatically exited (that is, the bus tie circuit breaker will be automatically opened), and the incoming line circuit breaker on this incoming line will be automatically closed.

[0046] For example, when the voltage on the incoming line side of the incoming line circuit breaker QF3 is abnormal, it is not allowed to close (manually open) the incoming line circuit breaker QF3, and manual closing of the bus tie circuit breaker QF5 is preferred. When the voltage on this incoming line side returns to normal, the bus tie circuit breaker QF5 is automatically opened and the incoming line circuit breaker QF3 is automatically closed.

[0047] In the above three modes, when the voltage on the incoming line side is abnormal, different operating modes can be set by running the conversion switch in conjunction with the PLC processor to meet the needs of various application scenarios.

[0048] When one of the transformers is under maintenance, if another transformer fails and temporarily stops working, that is, the voltages on both incoming lines are abnormal and a double fault occurs, the three buses are combined into a single bus by manual closing. Under this special condition, the load distribution must be readjusted to reduce the load to below 1250kVA, and the power supply of Class I loads and some important Class II loads must be ensured.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A three-input two-bus power supply system, characterized in that: include: Three busbars; Three incoming circuit breakers correspond to the three busbars one by one, and the incoming circuit breakers are connected to the corresponding busbars; Two bus tie circuit breakers, respectively connected between two adjacent busbars and interlocked with the corresponding incoming line circuit breakers; PLC processor; An operation transfer switch is connected to the PLC processor and is used to switch the operation mode of the three-incoming-line and two-bus-tie power supply system so that the incoming-line circuit breaker and the corresponding bus-tie circuit breaker can be automatically switched and / or automatically restored when the incoming-line voltage is abnormal.

2. The three-input-two-bus power supply system according to claim 1 is characterized in that: Also includes: Three transformers, corresponding one to one with the three incoming circuit breakers, the transformers being connected to input terminals of the incoming circuit breakers; Three incoming line cabinets, corresponding to the three incoming line circuit breakers one by one, used to carry the corresponding incoming line circuit breakers, and provided with incoming line transfer switches connected to the PLC processor and used to open and close the corresponding incoming line circuit breakers; Two bus tie cabinets correspond one to one with the two bus tie circuit breakers and are used to carry the corresponding bus tie circuit breakers. A bus tie transfer switch connected to the PLC processor and used to open and close the corresponding bus tie circuit breaker is arranged therein.

3. The three-input-two-bus power supply system according to claim 2 is characterized in that: The incoming line transfer switch and the busbar transfer switch are set to be automatic, and the operation transfer switch is set to be automatic.

4. The three-input-two-bus power supply system according to claim 2 is characterized in that: The incoming line transfer switch and the busbar transfer switch are set to automatic, and the operation transfer switch is set to automatic reset.

5. The three-input-two-bus power supply system according to claim 2 is characterized in that: The incoming line transfer switch and the busbar transfer switch are set to automatic, and the operation transfer switch is set to manual throw and automatic recovery.

6. The three-input-two-bus power supply system according to claim 2 is characterized in that: The incoming line transfer switch and the bus tie transfer switch are arranged on-site.

7. The three-input-two-bus power supply system according to claim 2 is characterized in that: The incoming line transfer switch and the bus tie transfer switch are remotely arranged.

8. The three-input-two-bus power supply system according to claim 1 is characterized in that: The three-incoming-line and two-bus-coupled power supply system is configured to readjust the load distribution to reduce the load to below 1250kVA when the voltages on the two incoming-line sides are abnormal at the same time.

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