Uninterruptible power transformation voltage secondary circuit nuclear phase system

Abstract

The invention belongs to the technical field of power grid construction, and particularly relates to an uninterruptible power transformation voltage secondary circuit nuclear phase system, which comprises a voltage input module, a voltage display module and a voltage parallel module which are electrically connected in sequence, through cooperation of the voltage input module, the voltage display module and the voltage parallel module, the phase checking device is integrated and packaged, a secondary loop can be transformed without power failure through the phase checking device, safety risks brought by voltage phase checking are reduced, the probability of missing phase checking is eradicated, the phase checking accuracy is ensured through numerical value comparison, and the working efficiency is improved. And a great effect is brought to secondary circuit transformation work. Besides, after the nuclear phase device is used, the operation mode of an original transformer substation is not changed in the transformation process, the power flow distribution of a power grid is stabilized, and huge safety and reliability are brought to the power grid. Powerful support is provided for stable operation of a power grid, and the normal order of social production and life can be guaranteed.

Description

TECHNICAL FIELD

[0002] The application belongs to the technical field of power grid construction, and particularly relates to a voltage secondary loop phase checking system for non-power-off reconstruction. BACKGROUND

[0003] With the deepening of the modernization construction of power grids, the upgrading and reconstruction work of traditional substations is gradually accelerated, and the reconstruction of the secondary voltage loop is also an important item in the traditional substations. In the process of the reconstruction of the secondary voltage loop, the traditional power-off reconstruction method gradually exposes many deficiencies.

[0004] In the process of the reconstruction of the traditional secondary voltage loop, the method of power-off removal of old devices and connection of new devices is usually adopted, and such operation needs to power off the related interval, needs to plan the construction period according to the power-off plan, has long construction period and low flexibility. Moreover, power-off also changes the existing operation mode and power flow distribution, has an influence on the voltage stability and power flow regulation of the system, and increases the complexity and technical difficulty of operation management.

[0005] At the same time, the traditional non-power-off phase checking method is complex in operation, low in efficiency, and difficult to completely guarantee the accuracy, and has been difficult to meet the demand of efficient operation of modern power grids. Moreover, the traditional phase checking method is complicated in process, needs to measure and judge many times manually, is low in efficiency and easy to have errors, is not conducive to the safety of work, and is difficult to meet the requirements of efficient, accurate and reliable operation of modern power grids.

[0006] In the prior art, if power-off reconstruction is adopted, the interval is powered off one by one, resulting in long construction period; if non-power-off reconstruction is adopted, the phase checking operation is complex and time-consuming, which also seriously affects the progress of the project and reduces the work efficiency; and the phase checking accuracy is low, and there is a safety risk; therefore, it is necessary to design a non-power-off voltage secondary loop phase checking system which can accurately and smoothly complete the secondary voltage phase checking and connection, so as to improve the stability of the power grid operation and significantly improve the work efficiency.

[0007] Therefore, the application provides a voltage secondary loop phase checking system for non-power-off reconstruction. SUMMARY

[0008] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0009] The technical scheme adopted by the present application to solve its technical problems is: the voltage secondary circuit phase comparison system for non-power transformation, comprising voltage input module, voltage display module and voltage parallel module connected in sequence; the voltage input module comprises appearance design unit and input-output test line selection unit, and is used for inserting the phase comparison device input secondary voltage; the voltage display module comprises voltage acquisition circuit unit, signal processing circuit unit, display circuit unit and device packaging unit, and forms the phase comparison device through packaging; the voltage parallel module comprises protection function selection unit and air switch appearance selection unit; and is used for overvoltage protection and protection function control.

[0010] Preferably, the appearance design unit is used for selecting the plug; and the plug adopts a banana plug.

[0011] Preferably, the input-output test line selection unit is used for the test line suitable for the size and amplitude of the secondary voltage; and the test line adopts a 4 square millimeter voltage test line.

[0012] Preferably, the voltage acquisition circuit unit is used for sampling the input alternating voltage; the voltage acquisition circuit unit needs to select and design the resistance voltage dividing circuit, phase detector, filter element and protection element; the resistance voltage dividing circuit is used for reducing the input large voltage to a level suitable for circuit processing; the phase detector is used for checking the size of the voltage and detecting the phase; the filter element is used for filtering some high-order or low-order harmonics; and the protection element is used for avoiding damage of the overvoltage to the circuit.

[0013] Preferably, the signal processing circuit unit is composed of a microcontroller and an analog-to-digital converter; the microcontroller is used for bearing the signal receiving, processing and output; and the analog-to-digital converter is used for converting the analog voltage signal into a digital signal, and the conversion process includes sampling, quantization and slowing down.

[0014] Preferably, the display circuit unit comprises a liquid crystal display and a power element; the liquid crystal display adopts an LCD display; the power element is the working power supply of the liquid crystal display; the power element usually has a transformer, filter capacitor and voltage stabilizer inside, and is used for converting a large voltage into a small voltage suitable for circuit working; the power voltage selected by the display circuit unit is the same as the voltage collected by the acquisition circuit unit.

[0015] Preferably, the device packaging unit is used for integrating the voltage acquisition circuit unit, signal processing circuit unit and display circuit unit into a voltage digital display circuit, and performing physical packaging on the circuit; and the device shell adopts PE material.

[0016] Preferably, the protection function selection unit adopts voltage protection, which includes undervoltage protection and overvoltage protection. The overvoltage protection issues a trip command or overvoltage signal when the fault voltage exceeds the protection setting value; the undervoltage protection issues a trip command or low voltage signal when the fault voltage is lower than the protection setting value.

[0017] Preferably, the selection unit for the appearance of the air switch realizes the switching of voltage, and uses an air switch to achieve this. A three-pole air switch is used, and its phase comparison needs to be performed on three groups A, B, and C. It needs to be used in conjunction with another three-pole air switch.

[0018] Preferably, the nucleus phase is suitable for the following steps: S1: Prepare two sets of voltage test leads, phase comparison devices, and secondary circuit design drawings; S2: Locate the corresponding terminal block by checking the secondary circuit voltage; S3: Connect the voltages of the new and old secondary circuits to the phase comparison device through the test line; S4: Observe the value displayed on the device. If it is inconsistent, you need to find the drawing again, solve the problem, and repeat S2-S4; if it is consistent, turn on the air switch. S5: Disconnect the old circuit and connect the new circuit; S6: Complete the phase integration and connection of a set of voltages, and repeat S2-S6; S7: Organize tools and restore the site to its initial state.

[0019] The beneficial effects of this invention are as follows: 1. The voltage secondary circuit phase comparison system for uninterrupted power supply retrofitting described in this invention integrates a voltage input module, a voltage display module, and a voltage parallel module into a phase comparison device. This device enables uninterrupted power supply retrofitting of the secondary circuit, reducing safety risks associated with voltage phase comparison and eliminating the probability of missed phases. Numerical comparison ensures the accuracy of phase comparison, significantly contributing to secondary circuit retrofitting. Furthermore, the use of the phase comparison device does not alter the original substation's operating mode during the retrofitting process, stabilizing the power flow distribution of the grid and significantly enhancing its safety and reliability. This provides strong support for the stable operation of the grid and helps ensure the normal order of social production and life.

[0020] 2. The voltage secondary circuit phase comparison system for uninterrupted power outage retrofitting described in this invention achieves voltage magnitude and phase comparison through integrated circuits. A novel integrated phase comparison device is designed, including voltage acquisition, processing, and display units. It directly connects to the old and new voltage circuits using voltage test terminals. The device automatically displays the magnitude and phase, is simple to operate, has moderate system complexity, and extremely high safety. It provides a clear view of voltage magnitude and phase with high accuracy. By pre-connecting the new voltage in parallel and using voltage test lines and the phase comparison device for real-time phase comparison, it effectively avoids the time consumption caused by switching power outage circuits in traditional methods. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a modular framework diagram of the voltage secondary circuit phase grading system for uninterrupted power supply modification in this invention; Figure 2 This is a module framework diagram of the voltage input module in this invention; Figure 3 This is a module framework diagram of the voltage display module in this invention; Figure 4 This is a module framework diagram of the voltage parallel module in this invention; Figure 5 This is a flowchart of the traditional uninterrupted power supply operation in this invention; Figure 6 This is a flowchart of the uninterrupted power supply operation in this embodiment of the present invention; Figure 7 This is a schematic diagram of the secondary phase voltage wire connection in this invention; Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0024] like Figures 1 to 7 As shown in the embodiment of the present invention, a voltage secondary circuit phase comparison system for uninterrupted power supply modification includes a voltage input module, a voltage display module, and a voltage parallel module connected in sequence. The voltage input module includes an appearance design unit and an input / output test line selection unit for connecting the secondary voltage input to the phase comparison device. The voltage display module includes a voltage acquisition circuit unit, a signal processing circuit unit, a display circuit unit, and a device packaging unit, which together form the phase comparison device. The voltage parallel module includes a protection function selection unit and an air switch appearance selection unit for overvoltage protection and protection function control.

[0025] This embodiment utilizes the phase comparison function based on the principle of voltage parallel connection. It achieves voltage magnitude and phase comparison through integrated circuits and designs a brand-new integrated phase comparison device, which includes voltage acquisition, processing, and display units. It directly connects to the new and old voltage circuits using voltage test terminals. The device automatically displays the magnitude and phase, is simple to operate, has moderate system complexity, and is extremely safe. It can intuitively show the voltage magnitude and phase with high accuracy. By pre-connecting the new voltage parallel and using voltage test lines and the phase comparison device for real-time phase comparison, it can effectively avoid the time consumption caused by power outage circuit switching in traditional methods.

[0026] like Figure 2 As shown, the appearance design unit is used for selecting the plug; the plug is a banana plug.

[0027] The appearance design unit provided in this embodiment mainly involves the selection of plugs for the appearance design of the input structure. The appearance of the plugs is selected based on the structure of the voltage test terminal blocks in conventional substations. There are two main types of voltage terminal blocks: one with connecting pieces and the other without connecting pieces. The plugs used for terminals with connecting pieces are banana-shaped, while the plugs used for terminal blocks without connecting pieces are round pins. Through comprehensive investigation, it was found that the voltage terminal blocks of substations in the uninterruptible power renovation area all have a structure with connecting pieces, which is suitable for banana plugs.

[0028] like Figure 2 As shown, the input / output test line selection unit is used for test lines applicable to the magnitude and amplitude of secondary voltage, and the test lines adopt 4 square millimeter voltage test lines.

[0029] The selection of input / output test leads provided in this embodiment is crucial to accommodate all secondary voltage magnitudes and amplitudes. The most important factor in choosing test leads is their size. Two commonly used voltage test lead sizes are 2.5 square millimeters and 4 square millimeters. Their thicknesses differ, and therefore, they can withstand different voltages. A larger square millimeter number indicates better voltage tolerance and greater safety. Both 2.5 square millimeter and 4 square millimeter voltage test leads can meet the requirements, but to avoid secondary overvoltage, the 4 square millimeter voltage test lead is safer.

[0030] like Figure 3 As shown, the voltage acquisition circuit unit is used to sample the input AC voltage; the voltage acquisition circuit unit needs to select and design a resistor voltage divider circuit, a phase detector, a filter element, and a protection element; the resistor voltage divider circuit is used to reduce the large input voltage to a level suitable for circuit processing; the phase detector is used to check the voltage magnitude and detect the phase; the filter element is used to filter some high-order harmonics or low-order harmonics; the protection element is used to prevent overvoltage from damaging the circuit.

[0031] The voltage acquisition circuit unit provided in this embodiment includes the selection of a resistor voltage divider circuit, a phase detector, a filter element, and a protection element; 1) Selection of resistor voltage divider circuit: A resistor divider circuit reduces a large input voltage to a level suitable for circuit processing. The selection of the resistor value is crucial for this type of circuit. As shown in formula (1-1), the larger the voltage divider resistor R1, the larger its output voltage.

[0032] (1-1) Wherein represents the equivalent resistance in the circuit, represents the input voltage, represents the output voltage, and represents the voltage divider resistor; this resistor divider is used to reduce the large voltage to a small voltage for the circuit to use, ensuring that the circuit can work normally and meet the requirements of the phase. Small resistors are suitable for applications requiring higher current, while large resistors are more suitable for low current applications. Therefore, resistors of 1KΩ-10KΩ are usually used to meet the voltage requirements of the circuit.

[0033] 2) Selection of phase detector: Because phase matching requires checking not only the voltage magnitude but also the phase, the correct phase sequence is essential. For example, the commercially available model using a phase detector is AD8302.

[0034] 3) Selection of filter components: Filtering components in circuits filter out high-order or low-order harmonics to prevent them from affecting the final result. Common filtering components include capacitors and inductors; however, capacitors can pass sinusoidal alternating current and impede direct current, while inductors impede sinusoidal alternating current but can pass direct current. Therefore, capacitors can filter parasitic circuits and static electricity in secondary equipment in substations, but inductors cannot. Thus, capacitors are chosen as the filtering components.

[0035] 4) Selection of protective components Protective components are designed to prevent overvoltage damage to circuits. Diodes are commonly used as protective components in integrated circuits. Their parameters, such as maximum forward current, maximum repetitive peak current, maximum repetitive peak voltage, and maximum continuous reverse voltage, ensure circuit safety. Small, high-speed switching diodes can also meet overvoltage protection requirements in terms of reliability and cost-effectiveness.

[0036] like Figure 3 As shown, the signal processing circuit unit consists of a microcontroller and an analog-to-digital converter. The microcontroller is used to receive, process, and output signals; the analog-to-digital converter is used to convert analog voltage signals into digital signals, and the conversion process includes sampling, quantization, and slowing down.

[0037] The signal processing circuit unit provided in this embodiment uses a microcontroller as one of the core components. This microcontroller is responsible for receiving, processing, and outputting signals, thereby achieving precise control and management of various signals within the circuit. As the "brain" of the circuit, the microcontroller's central processing unit (CPU) is responsible for executing instructions and performing various calculations, making it its most important component. Simultaneously, the microcontroller integrates various peripheral interfaces and control function modules, effectively simplifying circuit design and improving system operating efficiency. In this embodiment, the 8051 series is selected. An analog-to-digital converter (ADC) converts analog voltage signals into digital signals for further calculation and processing. In this embodiment, a 12-bit ADC is selected.

[0038] like Figure 3 and Figure 7 As shown, the display circuit unit includes a liquid crystal display (LCD) and a power supply component. The LCD is used for the operation of the liquid crystal display. The power supply component typically contains a transformer, a filter capacitor, and a voltage regulator to convert a large voltage into a small voltage suitable for the circuit operation. The power supply voltage selected by the display circuit unit is the same as the voltage acquired by the acquisition circuit unit.

[0039] The display circuit unit provided in this embodiment uses an LCD display; the secondary phase voltage of the power supply element ranges from 57.74V to 120V.

[0040] like Figures 1 to 2 As shown, the device's packaging unit integrates the voltage acquisition circuit unit, signal processing circuit unit, and display circuit unit into a single circuit for a voltage digital display circuit, and physically encapsulates the circuit; the device's outer shell is made of PE material.

[0041] The device packaging unit provided in this embodiment uses PE material for the outer shell. The size selection is determined by comprehensively considering the size of the voltage acquisition circuit, signal processing circuit, display circuit, ductility of PE material, and suitable LCD screen for the display circuit. Then, the voltage acquisition circuit unit, signal processing circuit unit, and display circuit unit are integrated into a single circuit to form a voltage digital display circuit, and then physically packaged.

[0042] like Figure 4 As shown, the protection function selection unit adopts voltage protection, which includes undervoltage protection and overvoltage protection. The overvoltage protection issues a trip command or overvoltage signal when the fault voltage exceeds the protection setting value; the undervoltage protection issues a trip command or low voltage signal when the fault voltage is lower than the protection setting value.

[0043] The protection function selection unit provided in this embodiment includes overvoltage protection, which issues a trip command or overvoltage signal when the fault voltage exceeds the protection setting value. Undervoltage protection, on the other hand, issues a trip command or undervoltage signal when the fault voltage is lower than the protection setting value. A comparison and analysis of the two protection functions are shown in the table below:

[0044] like Figure 4 As shown, the selection unit for the appearance of the air switch realizes the switching of voltage. It uses an air switch, specifically a three-pole air switch. Its phase comparison requires phase comparison of three groups (A, B, and C), and it needs to be used in conjunction with another three-pole air switch.

[0045] The air switch appearance selection unit provided in this embodiment utilizes the air switch to achieve the parallel operation capability in the voltage parallel structure. Ordinary air switches are compatible with AC voltages of 0-500V. This device is only used under a secondary voltage of 100V, so an ordinary air switch can be used to switch the voltage on and off. The protection function is also implemented through the air switch. There are many types of AC air switches, distinguished by the number of poles: single-pole, double-pole, and three-pole. An analysis of these types of air switches is shown in the table below:

[0046] like Figure 6 As shown, the nucleus phase is applicable to the following steps: S1: Prepare two sets of voltage test leads, phase comparison devices, and secondary circuit design drawings; S2: Locate the corresponding terminal block by checking the secondary circuit voltage; S3: Connect the voltages of the new and old secondary circuits to the phase comparison device through the test line; S4: Observe the value displayed on the device. If it is inconsistent, you need to find the drawing again, solve the problem, and repeat S2-S4; if it is consistent, turn on the air switch. S5: Disconnect the old circuit and connect the new circuit; S6: Complete the phase integration and connection of a set of voltages, and repeat S2-S6; S7: Organize tools and restore the site to its initial state.

[0047] The phase verification method provided in this embodiment is applicable to traditional modification processes that are time-consuming, requiring more than 20 minutes per group of voltage phase verifications. The operation steps are complex and inefficient. Manual measurement and multiple judgments not only waste time but are also prone to errors, severely restricting the improvement of work efficiency. Traditional uninterrupted power supply operation procedures, such as... Figure 6 As shown; through technological innovation and process optimization, the time for each voltage phase re-entry can theoretically be reduced from over 20 minutes to less than 5 minutes. The operation process is as follows:Figure 5 As shown, this not only reduces the voltage phase verification time for each group to less than 5 minutes, but also significantly reduces human error, ensuring efficiency and accuracy, and providing an efficient solution for power grid transformation.

[0048] Working principle: Voltage magnitude and phase comparison is achieved through integrated circuits. A brand-new integrated phase comparison device is designed, which includes voltage acquisition, processing and display units. The device is directly connected to the old and new voltage circuits through voltage test terminals. The device automatically displays the magnitude and phase. It is simple to operate, has moderate system complexity, and extremely high safety. The voltage magnitude and phase can be seen intuitively, and the accuracy is high. By pre-connecting the new voltage in parallel and using the voltage test line and phase comparison device for real-time phase comparison, the time consumption caused by power outage circuit switching in the traditional method can be effectively avoided.

[0049] In the design and selection process: the plug adopts a banana plug shape, and the input and output test leads use 4 square millimeter test leads; the voltage acquisition circuit unit uses a small resistor voltage divider, and the phase detector selected is model AD8302; the filtering element uses capacitor filtering, and the protection element uses small diodes; in the signal processing circuit unit, the microcontroller is one of the core components, undertaking the tasks of receiving, processing, and outputting signals, thereby realizing the precise control and management of various signals in the circuit, and the model selected is 8051 series; the analog-to-digital converter converts analog voltage signals into digital signals for further calculation and processing, and in this embodiment, a 12-bit analog-to-digital converter is selected; the device packaging unit is used to integrate the voltage acquisition circuit unit, signal processing circuit unit, and display circuit unit into a voltage digital display circuit, and the circuit is physically packaged.

[0050] The phase comparison device allows for uninterrupted modification of secondary circuits, reducing safety risks associated with voltage phase comparison and eliminating the probability of missed phase comparisons. Numerical comparison ensures accurate phase comparisons, significantly benefiting secondary circuit modification work. Furthermore, the use of the phase comparison device does not alter the original substation's operating mode during modification, stabilizing the power flow distribution of the grid and significantly enhancing its safety and reliability. This provides strong support for the stable operation of the grid and helps ensure the normal order of social production and life. The above describes the basic principles, main features, and advantages of this invention. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A no-break retrofit voltage secondary circuit phase comparison system, characterized by: The voltage input module, the voltage display module and the voltage parallel module are sequentially electrically connected. The voltage input module includes an appearance design unit and an input-output test line selection unit, which are used for plugging the input secondary voltage of the phase comparison device. The voltage display module includes a voltage acquisition circuit unit, a signal processing circuit unit, a display circuit unit and a device packaging unit, and forms the phase comparison device through packaging. The voltage parallel module includes a protection function selection unit and an air switch appearance selection unit, which are used for overvoltage protection and protection function control.

2. A no-break retrofit voltage secondary circuit phase comparison system according to claim 1, characterized in that: The appearance design unit is used for selecting a plug, and the plug is a banana plug.

3. A no-break retrofit voltage secondary circuit phase comparison system according to claim 2, characterized in that: The input-output test line selection unit is used for test lines suitable for the size and amplitude of the secondary voltage, and the test line is a 4 square millimeter voltage test line.

4. A no-break retrofit voltage secondary circuit phase comparison system according to claim 3, characterized in that: The voltage acquisition circuit unit is used for sampling the input alternating voltage, and needs to select and design a resistance dividing circuit, a phase detector, a filter element and a protection element; the resistance dividing circuit is used for reducing the input high voltage to a level suitable for circuit processing; the phase detector is used for checking the size of the voltage and detecting the phase; the filter element is used for filtering some high or low harmonics; and the protection element is used for avoiding damage of overvoltage to the circuit.

5. A no-break retrofit voltage secondary circuit phase comparison system according to claim 4, characterized in that: The signal processing circuit unit is composed of a microcontroller and an analog-to-digital converter, the microcontroller is used for receiving, processing and outputting signals, and the analog-to-digital converter is used for converting an analog voltage signal into a digital signal, and the conversion process includes sampling, quantization and slowing down.

6. A no-break retrofit voltage secondary circuit phase comparison system according to claim 5, characterized in that: The display circuit unit includes a liquid crystal display and a power element, the liquid crystal display is an LCD display, the power element is a working power supply of the liquid crystal display, the power element usually has a transformer, a filter capacitor and a voltage stabilizer inside, which are used for converting a high voltage into a small voltage suitable for circuit working, and the power voltage selected by the display circuit unit is the same as the voltage collected by the acquisition circuit unit.

7. A no-break retrofit voltage secondary circuit phase comparison system according to claim 6, characterized in that: The device packaging unit is used for integrating the voltage acquisition circuit unit, the signal processing circuit unit and the display circuit unit into a voltage display circuit on one circuit, and performing physical packaging on the circuit, and the shell of the device is made of PE material.

8. A no-break retrofit voltage secondary circuit phase comparison system according to claim 7, characterized in that: The protection function selection unit adopts voltage protection, the voltage protection includes under-voltage protection and over-voltage protection, the over-voltage protection is to issue a trip command or an over-voltage signal when the fault voltage exceeds the protection setting value, and the under-voltage protection is to issue a trip command or a low-voltage signal when the fault voltage is lower than the protection setting value.

9. A no-break retrofit voltage secondary circuit phase comparison system according to claim 8, characterized in that: The air switch appearance selection unit realizes the on-off of voltage, and is achieved by using an air switch, a three-pole air switch is used, the phase comparison needs to compare the ABC three groups, and a three-pole air switch needs to be used in cooperation.

10. A no-break retrofit voltage secondary circuit phase comparison system according to claim 9, characterized in that: The phase comparison is suitable for the following steps: S1: preparing two groups of voltage test lines, a phase comparison device and secondary circuit design drawings; S2: finding the corresponding terminal row by checking the secondary circuit voltage; S3: connecting the voltage of the new and old secondary circuits to the phase comparison device through the test lines. S4: observe the numerical size of the display of the observation device, if not consistent, need to re-find the drawing, solve the problem, repeat S2-S4; if consistent, open the air switch; S5: remove the old circuit, access to the new circuit; S6: complete a set of voltage phase and access, repeat S2-S6; S7: arrange the tools, restore the initial state of the scene.

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