Low-voltage transformer area contact box and switching power supply system thereof

Abstract

The embodiment of the invention discloses a low-voltage transformer area contact box and a transfer power supply system thereof, the low-voltage transformer area contact box comprises a box body, the box body is internally provided with a primary main loop, and the primary main loop comprises an electric operation unit circuit breaker used for switching on, switching off and protecting the primary main loop and an isolating switch used for isolating a power supply; the main bus bar is used for connecting the electric operating unit circuit breaker and the isolating switch; the mutual inductance unit is coupled with the main bus bar; one end of the electric operation unit circuit breaker is connected with a cable of one transformer area, the other end of the electric operation unit circuit breaker is connected with the main bus bar, the main bus bar is further connected with one end of the isolation switch, and the other end of the isolation switch is connected with a cable of the other transformer area; the system has the advantages that power supply switching processing can be carried out when the transformer area breaks down or is overhauled, and normal power utilization of production and life of residents in the transformer area is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of power supply, and in particular relates to a low-voltage station area connection box and a power supply transfer system thereof. Background Art

[0002] At present, in the construction of distribution network projects, suburban and rural low-voltage substations are all powered independently. Generally, when a line fault or equipment fault occurs in a substation and needs to be repaired, the entire substation needs to be shut down for maintenance. The power outage is large in scope, which has a great impact on residential electricity consumption, commercial electricity consumption, and small industrial production electricity consumption, causing economic losses to electricity users and power supply companies.

[0003] And when the distribution transformer is heavily overloaded, it is necessary to add new distribution transformers or cut and transfer loads from other substations, which sometimes requires extending a long distance to achieve; such situations may encounter obstacles and other uncertainties during implementation, making the time period required longer.

[0004] The above problems have a great impact on the normal electricity consumption of residents in the substation area. Once a fault occurs or a power outage is required for maintenance, it will affect the normal electricity consumption in the substation area.

[0005] Therefore, there is an urgent need for a solution that can transfer power when a failure or maintenance occurs in the substation area to ensure normal electricity use for residents in the substation area. Summary of the invention

[0006] The object of the present invention is to provide a low-voltage area contact box and a power supply transfer system thereof, so as to realize power supply transfer processing when a fault or maintenance occurs in the area.

[0007] In the first aspect, the technical solution adopted by the present invention is: a low-voltage substation contact box, including a box body, the box body includes a primary main circuit, the primary main circuit includes an electric operation unit circuit breaker for switching on and off and protecting the primary main circuit, an isolating switch for isolating a power supply, a main busbar for connecting the electric operation unit circuit breaker and the isolating switch, and a mutual inductance unit coupled to the main busbar;

[0008] One end of the electric operation unit circuit breaker is connected to a cable in one substation area, and the other end of the electric operation unit circuit breaker is connected to the main bus bar. The main bus bar is also connected to one end of the disconnector, and the other end of the disconnector is connected to a cable in another substation area.

[0009] Preferably, the mutual inductance unit comprises a first mutual inductance unit for measuring and a second mutual inductance unit for metering.

[0010] Preferably, the box body further includes a secondary circuit, the secondary circuit includes an electric operating mechanism control circuit, and the electric operating mechanism control circuit is connected to the electric operating unit in the electric operating unit circuit breaker.

[0011] Preferably, a meter is installed in the box, and a digital display is installed on the box;

[0012] The digital display is connected to the first mutual inductor unit; the meter is connected to the second mutual inductor unit.

[0013] Preferably, the box is also provided with a cable gland for fixing and protecting the cable.

[0014] Preferably, a metering and collection terminal for uploading data is also provided in the box.

[0015] Preferably, the metering and collection terminal is connected to the meter via a communication bus; a password generation module is also deployed in the metering and collection terminal, and the password generation module is used to encrypt the collected electricity data.

[0016] Preferably, a digital temperature-compensated crystal oscillator is deployed in the meter, and the digital temperature-compensated crystal oscillator is used as a clock source to improve the accuracy of acquisition.

[0017] In a second aspect, another technical solution adopted by the present invention is: a power supply system, comprising a back end and a plurality of low-voltage area contact boxes as described in the first aspect;

[0018] The backend is used to:

[0019] Receive electricity data uploaded by the contact boxes of each low-voltage area;

[0020] The power data is transmitted to a pre-trained state assessment model for processing to determine whether the power data is abnormal.

[0021] Preferably, the state assessment model is trained and verified using a deep learning algorithm, and a confidence interval is set based on the processing results.

[0022] The above technical scheme has the following advantages: the primary main circuit includes an electric operation unit circuit breaker for switching on and off and protecting the primary main circuit, an isolating switch for isolating the power supply, a main busbar for connecting the electric operation unit circuit breaker and the isolating switch, and a mutual inductance unit coupled to the main busbar; one end of the electric operation unit circuit breaker is connected to a cable in a substation area, and the other end of the electric operation unit circuit breaker is connected to the main busbar, and the main busbar is also connected to one end of the isolating switch, and the other end of the isolating switch is connected to a cable in another substation area; the technical effect of power supply being able to be transferred when a fault or maintenance occurs in the substation area to ensure normal electricity use for residents in the substation area is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the connection of a primary main circuit in a low-voltage area connection box provided by an embodiment of the present invention;

[0024] Figure 2 A connection diagram of a control circuit of an electric operating mechanism provided by an embodiment of the present invention;

[0025] Figure 3 A side view of a low-voltage area connection box provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the drawings and specific embodiments. The description here does not mean that all the subjects corresponding to the specific examples stated in the embodiments are cited in the claims.

[0027] Reference Figure 1 As shown, the present invention provides a low-voltage substation area contact box, including a box body, wherein the box body includes a primary main circuit, wherein the primary main circuit includes an electric operation unit circuit breaker for switching on and off and protecting the primary main circuit, an isolating switch for isolating a power supply, a main busbar for connecting the electric operation unit circuit breaker and the isolating switch, and a mutual inductance unit coupled to the main busbar;

[0028] One end of the electric operation unit circuit breaker is connected to a cable in one substation area, and the other end of the electric operation unit circuit breaker is connected to the main bus bar. The main bus bar is also connected to one end of the disconnector, and the other end of the disconnector is connected to a cable in another substation area.

[0029] It should be noted that the contact box is used to connect the power feeders of two substations, so that the substation lines are connected. When there is a power outage in any of the substations, the low-voltage substation contact distribution box can be used as a contact switch, and the other substation will supply power to it, which is convenient for cutting and transferring loads between substations.

[0030] Figure 1 L1, L2 and L3 represent cables in one substation; L11, L12 and L13 represent cables in another substation; ABC represents the main busbar; 1QF represents the electric operation unit circuit breaker; 1QS represents the disconnector.

[0031] In a specific implementation, the mutual inductance unit includes a first mutual inductance unit for measuring and a second mutual inductance unit for metering; that is, Figure 1 Among them, 1TA-C: measuring current transformer, 2TA-C: metering current transformer.

[0032] The specific working process is as follows:

[0033] When the substation line is operating normally, the electric operation unit circuit breaker is in the open state, and the isolating switch is in the open state. When the line or equipment outgoing line of the primary substation fails (the residential load of the primary substation is in a power-off state), (the power supply incoming line side of the electric operation unit circuit breaker is in a power-off state), the isolating switch is closed through the operating handle of the isolating switch, and then the electric operation unit circuit breaker is electrically closed; at this time, the line or equipment of the primary substation is energized, and the residential load of the primary substation is transferred from the secondary substation to realize normal power consumption in the primary substation;

[0034] Similarly, when there is a fault in the outgoing line or equipment in the secondary circuit substation (the residential load in the secondary circuit substation is in a power-off state), (the power supply incoming line side of the isolating switch is in a power-off state), the isolating switch is closed through the operating handle of the isolating switch, and then the electric operation unit circuit breaker is electrically closed. At this time, the line or equipment in the secondary circuit substation is energized, and the residential load in the secondary circuit substation is transferred from the primary circuit substation to achieve normal power consumption in the secondary circuit substation.

[0035] In this embodiment, a meter is also installed in the box, and a digital display is also installed on the box; the data collected by the meter includes power consumption, voltage, current, power and other power data;

[0036] The digital display is connected to the first mutual inductor unit; the meter is connected to the second mutual inductor unit.

[0037] The box body also includes a secondary circuit, which includes an electric operating mechanism control circuit, and the electric operating mechanism control circuit is connected to the electric operating unit in the electric operating unit circuit breaker.

[0038] The electric operating mechanism control circuit includes a relay, a fuse, a push button switch and a corresponding indicator light. The specific connection structure is as follows Figure 2 As shown;

[0039] Figure 2It is the control circuit of the 1QF electric operation unit circuit breaker. Through the interlocking of the closing and opening buttons SH, SF's start and stop and the auxiliary contacts of the intermediate relay KA, the circuit breaker is opened and closed. Among them, the control power comes from both sides of the electric operation unit circuit breaker, which can ensure that the circuit breaker can be opened and closed electrically when power is received from the one-way station area, and can also ensure that the circuit breaker can be opened and closed when power is received from the two-way station area.

[0040] In this embodiment, the electric operation unit circuit breaker adopts an electronic tripping device based on microprocessor technology, which has high tripping accuracy, high action reliability, and is less affected by the external environment, and has the following characteristics:

[0041] 1) Overload protection: It has an overload long-delay inverse time overcurrent action release, which can adjust the overload protection current according to the load demand of the substation to ensure the coordination of line protection and the overload protection operation of the transformer;

[0042] 2) Short-circuit protection: It has instantaneous protection function to prevent the expansion of damage caused by short circuit between lines and ensure stable and reliable operation of the power grid;

[0043] 3) Equipped with electric operation unit and auxiliary contacts for switch status indication and later automation information collection;

[0044] 4) It can be poured and used without reducing the capacity.

[0045] Furthermore, the box body is also provided with a cable gland for fixing and protecting the cable; at the same time, it can also prevent water and other substances from entering the box body.

[0046] Furthermore, the box is also provided with a metering and collecting terminal for uploading data; the data here is the electricity data mentioned above.

[0047] Specifically, the metering and collecting terminal is connected to the meter via a communication bus, and the metering and collecting terminal is also connected to an external metering system via wireless communication; wherein the communication bus may be RS485 or Modbus.

[0048] During implementation, in order to improve the security of data transmission, a password generation module is also deployed in the metering and collection terminal, and the password generation module is used to encrypt the collected power data;

[0049] At the same time, it can also support the aggregation of multi-source data and realize the merging of different measurement data.

[0050] Furthermore, in another embodiment, in order to address the current problem of high errors between measured values ​​and actual values, a digital temperature compensated crystal oscillator is deployed in the meter, and the digital temperature compensated crystal oscillator is used as a clock source to improve the accuracy of acquisition; by providing an accurate time reference, the consistency and synchronization of network time are maintained, so that the data is more accurate during the acquisition process.

[0051] like Figure 3 As shown, in this embodiment, the top cover of the box body adopts a ridge structure; the box body is a stainless steel box body, such as a 304 stainless steel shell, which has sufficient mechanical strength and shall not be deformed or damaged during lifting, transportation and installation; the box door is sealed and waterproof, and there are no exposed detachable bolts outside the box body; the door axis is concealed, and the box door should be able to open more than 90 degrees. After closing, the door handle rotates past the dead point, and the lock tongue is inserted up and down at the same time.

[0052] Through the low-voltage substation communication box, the substation lines are connected, and power can be transferred during power outages, which is convenient for cutting and transferring loads between substations. In addition to power outages caused by distribution transformers due to faults, there are also planned power outages due to normal line maintenance. When these situations occur, since there is communication between the substation lines, power can be transferred first when a power outage occurs in the substation, which helps to avoid considering which substation to extend from and whether the extension path is reasonable when load cutting and transfer are required. This can greatly shorten working time and help maintenance personnel find the release point in a shorter time when cutting and transferring loads, greatly improving the communication performance between substations. It can still ensure normal electricity consumption in the substation, minimizing the impact of power outages in the substation on residents' lives.

[0053] By applying a low-voltage substation interconnection distribution box provided in this application, the application prospects are broad, and the load cutting and transfer between substations can be more effectively realized, while improving construction efficiency and reducing the impact of project implementation on the lives of surrounding residents.

[0054] The present application also provides a power supply transfer system, including a back end and a plurality of low-voltage station area contact boxes as described above;

[0055] The backend is used to:

[0056] Receive electricity data uploaded by the contact boxes of each low-voltage area;

[0057] The power data is transmitted to a pre-trained state assessment model for processing to determine whether the power data is abnormal.

[0058] In this embodiment, the state assessment model is trained and verified using a deep learning algorithm, and a confidence interval is set based on the processing results.

[0059] Use deep learning algorithms to mine and analyze the uploaded data information to determine whether there are any abnormal problems with the meter, specifically:

[0060] The collected electricity data is a kind of time series data, each of which is measured within a specific time interval. Through model mining and analysis, valuable information hidden in the time series can be extracted.

[0061] First, the long short-term memory network is used to train and verify the model using the existing data information, and then the model can be used to predict the expected values ​​of the current, voltage, power and other data in the future readings; that is, the processing results are obtained;

[0062] Then a combined judgment is made based on the set confidence interval; if the result is within the confidence interval, it is considered that there is no abnormality; on the contrary, if the result is not within the confidence interval, it is determined that an abnormality has occurred.

[0063] At the same time, in view of the actual situation of multiple meters and in order to improve the training efficiency of the model, during training, using the established model as the starting point for training the unestablished model will greatly reduce the overall training time of the model;

[0064] The clustering-based chain transfer learning method makes it possible to build a neural network-based prediction model for a large number of meters in a short time; the combination of clustering and chain transfer learning improves the performance of chain transfer learning by restricting the migration of model parameters within the same cluster.

[0065] Those of ordinary skill in the art will appreciate that the modules and steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0066] Finally, it should be noted that the above description is a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A low voltage area contact box, comprising a box body, characterized in that: The box includes a primary main circuit, which includes an electric operation unit circuit breaker for switching on and off and protecting the primary main circuit, an isolating switch for isolating the power supply, a main busbar for connecting the electric operation unit circuit breaker and the isolating switch, and a mutual inductance unit coupled to the main busbar; One end of the electric operation unit circuit breaker is connected to a cable in one substation area, and the other end of the electric operation unit circuit breaker is connected to the main bus bar. The main bus bar is also connected to one end of the disconnector, and the other end of the disconnector is connected to a cable in another substation area.

2. A low voltage area contact box according to claim 1, characterized in that: The mutual inductance unit includes a first mutual inductance unit for measuring and a second mutual inductance unit for metering.

3. A low voltage area contact box according to claim 1 or 2, characterized in that: The box body also includes a secondary circuit, which includes an electric operating mechanism control circuit, and the electric operating mechanism control circuit is connected to the electric operating unit in the electric operating unit circuit breaker.

4. A low voltage area contact box according to claim 3, characterized in that: A meter is also installed in the box, and a digital display is also installed on the box; The digital display is connected to the first mutual inductor unit; the meter is connected to the second mutual inductor unit.

5. A low voltage area contact box according to claim 4, characterized in that: The box body is also provided with a cable gland for fixing and protecting the cable.

6. A low voltage area contact box according to claim 5, characterized in that: The box is also provided with a metering and collecting terminal for uploading data.

7. A low voltage area contact box according to claim 6, characterized in that: The metering and collecting terminal is connected to the meter via a communication bus; a password generating module is also deployed in the metering and collecting terminal, and the password generating module is used to encrypt the collected electricity quantity data.

8. A low voltage area contact box according to claim 7, characterized in that: A digital temperature-compensated crystal oscillator is deployed in the meter, and the digital temperature-compensated crystal oscillator is used as a clock source to improve the accuracy of acquisition.

9. A power transfer system, characterized in that: It comprises a rear end and a plurality of low-voltage area contact boxes as claimed in claim 8; The backend is used to: Receive electricity data uploaded by the contact boxes of each low-voltage area; The power data is transmitted to a pre-trained state assessment model for processing to determine whether the power data is abnormal.

10. A power transfer system according to claim 9, characterized in that: The state assessment model is trained and validated using a deep learning algorithm, and a confidence interval is set based on the processing results.

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