A control system for parallel operation of 10kV distribution transformers

Abstract

The present invention discloses a control system for parallel operation of 10kV distribution transformers, a load control terminal, which is arranged on the main incoming line circuit of the distribution transformer, and is used for real-time monitoring and recording the load conditions of the substation, and can remotely monitor and control the parallel operation of the distribution transformers; the present invention measures the total current of the main incoming line circuit by using the load control terminal, and operates the auxiliary transformer load switch according to the real-time measured load conditions of the substation, so as to realize the load-adaptive auxiliary transformer switching control function, and realize automatic and rapid switching in areas with large load fluctuations; by realizing the automatic switching function of the auxiliary transformer in parallel operation, automatic switching can be realized in the event of load overload, and the response speed of the substation overload problem is effectively improved, and when the distribution transformer load changes from overload to overload, the system can realize automatic exit from operation.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer control, and in particular to a control system for parallel operation of 10kV distribution transformers. Background Art

[0002] In view of the characteristics of the festive homecoming load of the Guizhou power grid, in order to make full use of the old transformers that have been replaced by capacity increase, some substations will adopt the method of operating two distribution transformers in parallel to increase the capacity. This operation mode is highly economical and reliable, and can solve the problem of seasonal heavy overload of distribution transformers. However, the switching of the auxiliary transformers of the parallel-operated transformers still relies on manual or PLC installation for operation, which brings certain manpower and investment costs. Calculated based on the cost of two people and one car for each switching, the cost of each parallel-operated transformer needs to spend nearly 200 yuan in labor costs each time. Due to the high value of PLC switching operations and the technical barriers for operators, manual operation to control the switching of parallel distribution transformers requires a lot of manpower to support, which consumes a lot of time and increases the operation and maintenance costs. At the same time, the long-term operation of parallel distribution transformers will increase losses. Summary of the invention

[0003] In view of the above-mentioned problems existing in the existing control system for parallel operation of 10kV distribution transformers, the present invention is proposed.

[0004] Therefore, an object of the present invention is to provide a control system for parallel operation of 10kV distribution transformers.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0006] The load control terminal is installed on the main incoming line circuit of the distribution transformer. It is used to monitor and record the load conditions of the substation in real time. It can remotely monitor and control the parallel operation of the distribution transformer.

[0007] As a preferred solution of the control system for parallel operation of 10kV distribution transformers described in the present invention, the load control terminal measures the load condition of the substation by measuring the total current of the total incoming line loop.

[0008] As a preferred solution of the control system for parallel operation of 10kV distribution transformers described in the present invention, the load control terminal is composed of a hardware carrier and a peripheral circuit.

[0009] As a preferred solution of the control system for parallel operation of 10kV distribution transformers of the present invention, wherein: the hardware carrier includes a computing unit, which is used to process load data;

[0010] The control unit is used to control the switching of the distribution transformer according to the data processed by the calculation unit.

[0011] As a preferred solution of the control system for parallel operation of 10kV distribution transformers of the present invention, wherein: the peripheral circuit includes a data monitoring unit, which is used to monitor the load condition of the distribution transformer;

[0012] As a preferred solution of the control system for parallel operation of 10kV distribution transformers described in the present invention, wherein: the switch node input and output unit is used to receive and send control signals;

[0013] The monitoring circuit is used to monitor the load status of the transformer.

[0014] As a preferred solution of the control system for parallel operation of 10kV distribution transformers described in the present invention, the peripheral circuit also includes a data storage unit, which is used to store load data and operation records.

[0015] As a preferred solution of the control system for parallel operation of 10kV distribution transformers described in the present invention, the hardware carrier is installed in a dedicated shell.

[0016] As a preferred solution of the control system for parallel operation of 10kV distribution transformers described in the present invention, the monitoring loop includes a current measurement module and a voltage measurement module.

[0017] As a preferred solution of the control system for parallel operation of 10kV distribution transformers described in the present invention, wherein: the switch node input and output unit is electrically connected to the distribution Internet of Things switch.

[0018] As a preferred solution of the control system for parallel operation of 10kV distribution transformers described in the present invention, the calculation unit is provided with buttons and a display screen.

[0019] The beneficial effects of the present invention are as follows: by using the load control terminal to measure the total current of the main incoming line circuit, the load situation of the substation is measured and recorded in real time, and the auxiliary transformer load switch is operated according to the real-time measured load situation of the substation, so as to realize the load-adaptive auxiliary transformer switching control function, and at the same time, combined with the switching strategy of the parallel operation transformer, it can realize automatic and rapid switching in areas with large load fluctuations; compared with the traditional manual switching auxiliary transformer, it has the characteristics of all-weather, timeliness, and meeting the load requirements of the substation;

[0020] By realizing the automatic switching function of the auxiliary transformer in parallel operation, automatic switching can be achieved in the event of load overload, effectively improving the response speed of the overload problem in the substation. When the distribution transformer load changes from overload to overload, the system can automatically exit operation. Using this system to realize the automatic switching function of the auxiliary transformer, according to the scale of 4,000 sets of parallel running transformers, it is estimated that an average operation can save nearly 800,000 in expenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0022] Figure 1 This is a schematic diagram of the distribution transformer parallel load control terminal of the present invention.

[0023] Figure 2 This is a schematic diagram of the parallel connection of the distribution transformer hardware of the present invention.

[0024] Figure 3 This is a schematic diagram of the parallel control logic of distribution transformers according to the present invention. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0029] Example 1

[0030] Reference Figure 1-Figure 3 , provides a control system for parallel operation of 10kV distribution transformers,

[0031] include,

[0032] The load control terminal is installed on the main incoming line circuit of the distribution transformer, which is used to monitor and record the load situation of the distribution area in real time, and can remotely monitor and control the parallel operation of the distribution transformer;

[0033] The load control terminal measures the load condition of the substation by measuring the total current of the main incoming line loop;

[0034] Through the intelligent switching of parallel-operated transformers, the load-adaptive switching control function of the auxiliary transformer is realized. At the same time, combined with the switching strategy of parallel-operated transformers, automatic and rapid switching can be achieved in areas with large load fluctuations.

[0035] Furthermore, the load control terminal is composed of a hardware carrier and a peripheral circuit; the hardware carrier cooperates with the peripheral circuit to achieve real-time measurement of the load situation in the substation area and to operate the auxiliary transformer load switch.

[0036] Further, the hardware carrier includes a computing unit, which is used to process load data;

[0037] The calculation unit is responsible for receiving real-time data from the data monitoring unit, such as current, voltage, power factor, etc., and processing it quickly; using algorithms to analyze load data to determine the best switching strategy to adapt to the changing grid load requirements; the calculation unit is also responsible for communicating with other grid management systems, receiving external instructions or uploading processed data;

[0038] A control unit, which is used to control the switching of the distribution transformer according to the data processed by the calculation unit;

[0039] The control unit performs specific operations according to the instructions of the calculation unit, such as switching on and off the auxiliary transformer of the distribution transformer; the control unit also has fault detection and self-protection functions, and can automatically disconnect when an abnormal situation is detected to protect the safety of the equipment and the power grid.

[0040] Further, the peripheral circuit includes a data monitoring unit, which is used to monitor the load condition of the distribution transformer;

[0041] The data monitoring unit is responsible for real-time monitoring of the operating status of the distribution transformer, including but not limited to parameters such as current, voltage, power, power factor and temperature. It uses high-precision sensors and transformers to obtain data to ensure the accuracy and reliability of the data. The data monitoring unit also has a data preprocessing function and can perform preliminary analysis on the original data to reduce the burden on the calculation unit.

[0042] A switch node input and output unit for receiving and sending control signals;

[0043] This unit is responsible for communicating with the switchgear of the distribution transformer, receiving instructions from the control unit and performing corresponding operations; it has a highly reliable communication protocol to ensure stable transmission of control signals under various grid conditions; the switch node input and output unit also has a state feedback function, which can feed back the state of the switchgear to the control unit in real time; the control unit sends control signals through the switch node input and output unit to control the parallel operation state of the distribution transformer;

[0044] The monitoring circuit is used to monitor the load status of the transformer. The monitoring circuit is specially designed for monitoring the load status of the transformer. It can monitor the operating status of the transformer in real time, including current, voltage and temperature. The monitoring circuit uses dedicated sensors and signal processing circuits to ensure the accuracy and real-time nature of the monitoring data. The circuit also has an abnormal alarm function, which can immediately notify the control unit to take corresponding measures when an abnormal load status of the transformer is detected.

[0045] Furthermore, the peripheral circuit also includes a data storage unit, which is used to store load data and operation records; the data storage unit is responsible for storing data processed by the calculation unit, including historical load data, operation records and system logs, etc.; it uses high-capacity, high-speed storage devices to ensure long-term preservation and fast access to data; the data storage unit also has data backup and recovery functions to prevent data loss or damage, and regularly checks the load data and operation records stored in the data storage unit; adjusts the control strategy according to the inspection results to optimize the parallel operation of distribution transformers.

[0046] By using the load control terminal to measure the total current of the main incoming line circuit, the load situation of the substation is measured and recorded in real time. The load switch of the auxiliary transformer is operated according to the real-time measured load situation of the substation, and the load-adaptive auxiliary transformer switching control function is realized. At the same time, combined with the switching strategy of the parallel transformer, automatic and rapid switching is realized in areas with large load fluctuations. Compared with the traditional manual switching auxiliary transformer, it has the characteristics of all-weather, timely, and in line with the load demand of the substation;

[0047] By realizing the automatic switching function of the auxiliary transformer in parallel operation, automatic switching can be achieved in the event of load overload, effectively improving the response speed of the overload problem in the substation. When the distribution transformer load changes from overload to overload, the system can automatically exit operation. Using this system to realize the automatic switching function of the auxiliary transformer, according to the scale of 4,000 sets of parallel running transformers, it is estimated that an average operation can save nearly 800,000 in expenses.

[0048] Example 2

[0049] Reference Figure 1-Figure 3 This embodiment is different from the first embodiment in that: the hardware carrier is installed in a dedicated shell; the hardware carrier is protected by the dedicated shell.

[0050] Furthermore, the monitoring loop includes a current measurement module and a voltage measurement module; the current measurement module is a key part of the system for accurately measuring the current in the incoming and outgoing line loops of the distribution transformer;

[0051] The voltage measurement module is responsible for measuring the input and output voltage of the distribution transformer to ensure that the voltage is within a safe and specified range.

[0052] Furthermore, the switch node input and output unit is electrically connected to the distribution Internet of Things switch; the switch node input and output unit is a key part of the device for controlling and monitoring the switch status of the distribution transformer; according to the instructions of the computing unit, a control signal is sent through the input and output unit to control the opening and closing status of the distribution Internet of Things switch, realize remote monitoring and control functions, and enable operators to remotely operate the distribution Internet of Things switch in the control center; the control signal adopts isolated transmission to improve the anti-interference ability of the system; the switch node input and output unit can receive status feedback signals of the distribution Internet of Things switch, such as opening and closing status, fault signals, etc.; the status information is transmitted to the computing unit through the input and output unit for further processing.

[0053] The rest of the structure is the same as that of Example 1.

[0054] Example 3

[0055] Reference Figure 1-Figure 3 , this embodiment is different from the above embodiments in that: the computing unit is provided with buttons and a display screen;

[0056] The keys can serve as inputs to the computing unit to enable manual control and configuration of the device.

[0057] The display screen is used as the output end of the computing unit to display the operating status, real-time data and configuration information of the device. The display screen can display the historical operation records and event logs of the device, which is convenient for operators to query and audit;

[0058] The buttons and display screen of the computing unit support on-site manual switching operations to provide backup operations in case of emergency or automatic control failure. Through the buttons and display screen, operators can configure and calibrate the device, such as setting switching thresholds, calibrating sensors, and updating firmware.

[0059] The rest of the structure is the same as that of Example 2.

[0060] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0061] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0062] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A control system for parallel operation of 10kV distribution transformers, characterized in that: include, The load control terminal is installed on the main incoming line circuit of the distribution transformer. It is used to monitor and record the load conditions of the substation in real time. It can remotely monitor and control the parallel operation of the distribution transformer.

2. The control system for parallel operation of 10kV distribution transformers according to claim 1, characterized in that: The load control terminal measures the load condition of the substation by measuring the total current of the main incoming line loop.

3. The control system for parallel operation of 10kV distribution transformers according to claim 2, characterized in that: The load control terminal is composed of a hardware carrier and a peripheral circuit.

4. The control system for parallel operation of 10kV distribution transformers according to claim 3, characterized in that: The hardware carrier includes a computing unit, which is used to process load data; The control unit is used to control the switching of the distribution transformer according to the data processed by the calculation unit.

5. The control system for parallel operation of 10kV distribution transformers according to claim 4, characterized in that: The peripheral circuit includes a data monitoring unit, which is used to monitor the load condition of the distribution transformer; A switch node input and output unit for receiving and sending control signals; The monitoring circuit is used to monitor the load status of the transformer.

6. The control system for parallel operation of 10kV distribution transformers according to claim 5, characterized in that: The peripheral circuit further includes a data storage unit for storing load data and operation records.

7. The control system for parallel operation of 10kV distribution transformers according to claim 5 or 6, characterized in that: The hardware carrier is installed in a dedicated shell.

8. The control system for parallel operation of 10kV distribution transformers according to claim 7, characterized in that: The monitoring loop includes a current measurement module and a voltage measurement module.

9. The control system for parallel operation of 10kV distribution transformers according to claim 8, characterized in that: The switch node input and output unit is electrically connected to the power distribution Internet of Things switch.

10. The control system for parallel operation of 10kV distribution transformers according to claim 9, characterized in that: The calculation unit is provided with buttons and a display screen.

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