A zero-sensing power supply system utilizing a combination of low-voltage generator and step-up transformer.

Abstract

This invention discloses a zero-sensory power supply system utilizing a combination of a low-voltage generator and a step-up transformer. It includes a three-phase high-voltage overhead line, with a No. 2 overhead line sectionalizing switch k2 electrically connected to the three-phase high-voltage overhead line. Lines 1 and 3 are electrically connected to the three-phase high-voltage overhead line on either side of the No. 2 overhead line sectionalizing switch k2, respectively. The system also includes a generator, which is electrically connected to a high-voltage busbar via line 2. Lines 1 and 3 are both electrically connected to the high-voltage busbar, and each of the lines 1, 2, and 3 is connected to the high-voltage busbar via a No. 1 on / off switch, a No. 2 on / off switch, and a No. 3 on / off switch, respectively. Compared to the shortcomings of traditional generator-based power supply systems, this zero-sensory power supply system ensures that users receive power throughout the entire process, unaffected by power outages or construction work. It features a simple structure, convenient operation, strong practicality, and meets the needs of power development.

Description

Technical Field

[0001] This invention relates to a zero-sensory power supply system, and more specifically, to a zero-sensory power supply system that utilizes a combination of a low-voltage generator and a step-up transformer with a synchronous high-voltage switchgear, belonging to the field of power supply equipment. Background Technology

[0002] With the continuous refinement of power supply company management, the number of customers experiencing power outages has become an increasingly important performance indicator for power supply companies at all levels. When construction work cannot be stopped, minimizing the number of customers experiencing power outages during construction projects is a challenge faced by power supply companies at all levels. In recent years, to reduce this key performance indicator, live-line work teams and companies have developed rapidly, and power supply companies at all levels have carried out large-scale live-line work. Simultaneously, because some construction sites and work tasks are not suitable for live-line work, power supply companies are investing significant manpower and resources to generate electricity using on-site generators and directly supply it to users to ensure power supply.

[0003] Currently, traditional generator-based power supply solutions can effectively reduce the number of households affected by power outages and significantly improve user satisfaction. However, due to differences in frequency and phase angle between the electricity generated by the generator and the electricity in the original power grid, it is not possible to directly connect the generator to the grid. The operation method requires first disconnecting the grid power supply and then connecting the generator power supply. Therefore, there is still a few seconds of actual power outage time. During the operation, customers' lights will flicker, computers will shut down, and equipment will stop operating, making it impossible to achieve true "zero-perception" power supply. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a zero-sensing power supply system utilizing a combination of a low-voltage generator and a step-up transformer, featuring the technical characteristics of enabling grid-connected operation of the generator and ensuring continuous power supply to user electrical equipment.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] A zero-sensory power supply system utilizing a combination of a low-voltage generator and a step-up transformer includes a three-phase high-voltage overhead line. A No. 2 overhead line sectionalizing switch k2 is electrically connected to the three-phase high-voltage overhead line. Lines No. 1 and No. 3 are electrically connected to the three-phase high-voltage overhead lines on either side of the No. 2 overhead line sectionalizing switch k2, respectively. The system also includes a generator, which is electrically connected to a high-voltage busbar via Line No. 2. Lines No. 1 and No. 3 are both electrically connected to the high-voltage busbar, and each of Lines No. 1, No. 2, and No. 3 is connected to the high-voltage busbar via a switch No. 1, a switch No. 2, and a switch No. 3, respectively.

[0007] Preferably, it also includes a synchronizing closing controller, which is connected to the No. 1 on / off switch via a line, and a No. 1 motor is connected to the No. 1 on / off switch to control the automatic opening and closing of the No. 1 on / off switch.

[0008] Preferably, the synchronous closing controller includes an electrical logic judgment module and an execution module and a sampling module electrically connected to the logic judgment module. Both line 1 and line 2 are three-phase lines, and each phase line of line 1 and line 2 has a sampling point. The sampling module is connected to the sampling points of line 1 and line 2 respectively through sampling data lines to obtain data information.

[0009] Preferably, the execution module is electrically connected to the No. 1 motor via a line to control the automatic opening and closing of the No. 1 on / off switch.

[0010] Preferably, the No. 2 on / off switch and the No. 3 on / off switch are respectively connected to the No. 2 motor and the No. 3 motor.

[0011] Preferably, display devices are provided on line 1, line 2, and line 3 respectively.

[0012] Preferably, the display device includes indicator lights.

[0013] Preferably, the third line is a three-phase line and each phase line of the third line has a sampling point. The sampling module is connected to the sampling point of the third line through a sampling data line to obtain data information.

[0014] Preferably, the No. 1 motor, No. 2 motor, and No. 3 motor are all grounded.

[0015] Preferably, it also includes a No. 1 overhead line sectionalizing switch k1, which is connected to the three-phase high-voltage overhead line, and the connection point between the No. 1 line and the three-phase high-voltage overhead line is located between the No. 1 overhead line sectionalizing switch k1 and the No. 2 overhead line sectionalizing switch k2.

[0016] Beneficial effects: Compared with the shortcomings of traditional generator power supply, the zero-sensory power supply system of this application enables users to truly enjoy power supply throughout the entire process and is not affected by power outage construction; it has a simple structure, is easy to operate, and is highly practical, meeting the needs of power development configuration. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is an enlarged view of part of the structure of the present invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

[0020] In practical applications, system wiring is complex and power consumption points are dispersed, requiring multiple power supply systems to operate simultaneously to meet actual power demands. This invention offers a flexible, non-interfering system that can be used in conjunction with multiple systems at different locations on the same line to meet practical needs.

[0021] like Figure 1-2 The illustration shows a specific embodiment of a zero-sensory power supply system utilizing a combination of a low-voltage generator and a step-up transformer. This embodiment includes a three-phase high-voltage overhead line, with a No. 2 overhead line sectionalizing switch k2 electrically connected to the three-phase high-voltage overhead line. Lines 1 and 3 are electrically connected to the three-phase high-voltage overhead lines on either side of the No. 2 overhead line sectionalizing switch k2, respectively. The system also includes a generator, which is electrically connected to a high-voltage busbar via line 2. Lines 1 and 3 are both electrically connected to the high-voltage busbar, and each of the lines 1, 2, and 3 is connected to the high-voltage busbar via a No. 1 on / off switch, a No. 2 on / off switch, and a No. 3 on / off switch, respectively. In this application, a step-up transformer is used when the generator is a low-voltage generator; if the generator is a medium-voltage generator, a step-up transformer is not used. After the system lines are connected, the low-voltage generator outputs 380V power, which is then converted into 10kV high-voltage power through a step-up transformer and input to the high-voltage busbar (high-voltage switchgear busbar). A synchronizing controller can be used to determine whether the line power and generator power meet the synchronization requirements. Specifically, the sampling module obtains information to determine whether the grid voltage and frequency are close to the generator voltage and frequency. If they are normal, the synchronizing closing device is activated via a mobile control terminal. If the power quality after generator voltage boosting is poor, the generator and step-up transformer are adjusted to make the power quality closer to the grid power. When the synchronization time node is reached, automatic synchronizing closing is performed, avoiding power outages caused by manual operation of opening and closing, achieving zero-perception power supply protection. The closing determination is achieved through the coordinated operation of the execution module and the sampling module.

[0022] Currently, generators provide power directly by supplying 380V to the main switch on the low-voltage side of the transformer or directly to the customer's low-voltage distribution box. However, 380V has relatively low power, limiting its application to small areas with low electricity consumption. In practice, a medium-voltage generator truck (which can be directly connected to overhead lines) is typically needed to achieve 10kV high voltage. While medium-voltage generator trucks offer greater power and can provide power over a wider area, their rental costs are high, their large size requires a large truck for transport, and they are particularly inaccessible in areas with complex terrain.

[0023] This application adds the use of a low-voltage generator G, eliminating concerns about the generator's source. After low-voltage power generation, a separate step-up transformer T is used to boost the voltage, and then a synchronizing device controls the synchronizing closing. Each component is independent, small in size and weight. Multiple components are combined to form a functional unit, which facilitates transportation and allows access to areas with complex terrain. At the same time, due to the flexible combination, three to five units can be clustered together to ensure power supply, solving the problem of insufficient power from low-voltage generators and enabling the entire power supply to achieve true zero power outage and zero perception.

[0024] In a preferred embodiment, the device further includes a synchronous closing controller, which is connected to a first on / off switch via a line. A first motor is connected to the first on / off switch to control the automatic opening and closing of the first on / off switch. The execution module controls the first motor to drive the first on / off switch to open and close.

[0025] In a preferred embodiment, the synchronizing closing controller includes an electrical logic judgment module and an execution module and a sampling module electrically connected to the logic judgment module. Both Line 1 and Line 2 are three-phase lines, and each phase line of Line 1 and Line 2 has a sampling point. The sampling module is connected to the sampling points of Line 1 and Line 2 respectively through sampling data lines to obtain data information. The information obtained by the sampling module is used to know whether the grid voltage and frequency are close to the generator voltage and frequency. If they are normal, the synchronizing closing device is started through the mobile control terminal. If the power quality after the generator is boosted is poor, the generator and the boost transformer are adjusted to make the power quality close to the grid voltage.

[0026] In a preferred embodiment, the execution module is electrically connected to motor number one via a line to control the automatic opening and closing of switch number one. Switch number two and switch number three are respectively connected to motor number two and motor number three to achieve automatic opening and closing. Motor number one, motor number two, and motor number three are all grounded.

[0027] Preferably, display devices are installed on lines one, two, and three respectively for easy reminders and observation. The display devices include indicator lights, namely, circuit breaker indicator lights.

[0028] In a preferred embodiment, the third line is a three-phase line and each phase line of the third line has a sampling point. The sampling module is connected to the sampling point of the third line through a sampling data line to obtain data information.

[0029] In a preferred embodiment, the method further includes a No. 1 overhead line sectionalizing switch k1, which is connected to the three-phase high-voltage overhead line. The connection point between the No. 1 line and the three-phase high-voltage overhead line is located between the No. 1 overhead line sectionalizing switch k1 and the No. 2 overhead line sectionalizing switch k2, which are relatively close to each other.

[0030] Example 1

[0031] Taking the power outage construction after the sectionalizing switch K2 on the No. 2 overhead line as an example, the power outage operation is as follows:

[0032] 1. Use high-voltage cables to connect all equipment or lines. At this time, all switches are in the open position, remote / local switches are in the remote position, and the open / close indicator lights are normal.

[0033] 2. The lines on both sides of the No. 2 overhead line sectionalizing switch k2 are energized and connected, that is, the No. 1 line and the No. 3 line are respectively connected to the three-phase high-voltage overhead lines on the left and right sides of the No. 2 overhead line sectionalizing switch k2.

[0034] 3. Start the generator (preferably a low-voltage generator G, in conjunction with a step-up transformer T), and adjust the electrical parameters (including frequency and voltage);

[0035] 4. Since Line 1, Line 2, and Line 3 are all three-phase lines, their connection with the three-phase high-voltage overhead line must be correct. Therefore, a phase checker is used to check the phase between Line 1 and Line 2, Line 1 and Line 3, and Line 2 and Line 3 respectively. If the phase is correct, proceed to the next step; if the phase is incorrect, adjust the connection.

[0036] 5. Manually or electrically close the No. 2 on / off switch on line No. 2 to transmit the electrical energy from the low-voltage generator G to the high-voltage bus.

[0037] 6. The synchronization controller uses the three-phase sampling points of the No. 1 and No. 2 line terminals to collect power data to determine the synchronization point. When the grid voltage and frequency are close to the generator voltage and frequency, the No. 1 on / off switch is automatically closed to connect the low-voltage generator G to the grid. Here, the synchronization controller can directly and intelligently control the generator parameters to achieve faster synchronization, but the generator needs to meet the wiring requirements. Some existing generators have this function.

[0038] 7. Manually or electrically connect the No. 3 on / off switch (the switch can be closed by pressing the electric closing button). The power supply behind the No. 3 line is still grid power, and no synchronization is required again.

[0039] 8. Open the sectionalizing switch K2 for overhead line No. 2;

[0040] 9. Adjust the remote / local switch on Line 1 to the local position, disconnect the No. 1 on / off switch (you can manually press the trip button), and change Line 1 from operation to standby. This completes the power outage part of the power supply protection work during the entire power outage period. The section of the line after the No. 2 overhead line section switch k2 is powered by the generator.

[0041] The power restoration operation is as follows (this power restoration operation is not based on the power outage operation process):

[0042] 1. After the power supply side of the No. 2 overhead line sectionalizing switch k2 is restored, use a phase checker to check the phase between line 1 and line 2 (or check the phase of the overhead line). If the phase is correct, proceed to the next step. If the phase is incorrect, adjust the connection.

[0043] 2. Manually or electrically close the No. 2 on / off switch on line 2 to allow the low-voltage generator G to transmit power to the high-voltage bus. The synchronization controller uses the three-phase sampling points of the terminals of lines 1 and 2 to collect power data to determine the synchronization point. When the grid voltage and frequency are close to the generator voltage and frequency, the No. 1 on / off switch is automatically closed to connect the low-voltage generator G to the grid. Manually or electrically connect the No. 3 on / off switch (which can be closed by pressing the electric closing button). The line after line 3 is still connected to the grid, and no synchronization is required again.

[0044] 3. Close the No. 2 overhead line sectionalizing switch k2;

[0045] 4. Manually or electrically disconnect the No. 1 on / off switch on line 1 and the No. 3 on / off switch on line 3 respectively to disconnect the generator from the grid;

[0046] 8. Turn off the low-voltage generator G;

[0047] 9. Remove the line connections on both sides of the No. 2 overhead line sectionalizing switch k2 (Line 1 and Line 3) while the line is energized to complete the entire power supply guarantee process.

[0048] In the event of a power outage during construction work on the line between overhead line sectionalizing switch k1 (No. 1) and overhead line sectionalizing switch k2 (No. 2), lines 1, 2, and 3 in this application can also be used as bypass switches. At this time, generators and step-up transformers are no longer needed. Simply open switches 1, 2, and 3, and connect the cables of lines 1 and 3 to the power supply side of overhead line sectionalizing switch k1 (No. 1) and the load side of overhead line sectionalizing switch k2 (No. 2) respectively while they are energized. Then, close switches 1 and 3 in sequence. The advantage is that generators are no longer needed, and power supply costs are significantly reduced, but longer connecting cables are required.

[0049] Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A zero perception power supply system using a low voltage generator and a step-up transformer combination comprising of three phase high voltage overhead lines, characterized by, The three-phase high-voltage overhead line is electrically connected with a No. 2 overhead line sectional switch k2, the three-phase high-voltage overhead line on the left and right sides of the No. 2 overhead line sectional switch k2 is respectively electrically connected with a No. 1 line and a No. 3 line, further comprising a generator, the generator is electrically connected with a high-voltage bus through a No. 2 line, the No. 1 line and the No. 3 line are electrically connected on the high-voltage bus, and a No. 1 on-off switch, a No. 2 on-off switch and a No. 3 on-off switch are arranged between the No. 1 line, the No. 2 line, the No. 3 line and the high-voltage bus respectively; Further comprising a synchronous closing controller, the synchronous closing controller is connected on the No. 1 on-off switch through a circuit, and a No. 1 motor is connected on the No. 1 on-off switch to control the No. 1 on-off switch to automatically open and close; The synchronous closing controller comprises an electrical logic judgment module, an execution module and a sampling module electrically connected with the logic judgment module, the No. 1 line and the No. 2 line are three-phase lines, and a sampling point is arranged on each phase line of the No. 1 line and the No. 2 line, the sampling module is connected on the sampling points of the No. 1 line and the No. 2 line through sampling data lines to obtain data information.

2. A zero perception power supply system using a low voltage generator and a step-up transformer combination as claimed in claim 1, wherein, The execution module is electrically connected with the No. 1 motor through a circuit to control the No. 1 on-off switch to automatically open and close.

3. The zero-awareness power supply system using a low-voltage generator and a step-up transformer combination according to claim 1 or 2, characterized by, The No. 2 on-off switch and the No. 3 on-off switch are respectively connected with a No. 2 motor and a No. 3 motor.

4. The zero-awareness power supply system using a low-voltage generator and a step-up transformer combination according to claim 1 or 2, characterized by, Display devices are arranged on the No. 1 line, the No. 2 line and the No. 3 line respectively.

5. A zero-awareness power supply system using a low-voltage generator and a step-up transformer combination according to claim 4, characterized in that, The display device comprises a signal lamp.

6. The zero-awareness power supply system using a low-voltage generator and a step-up transformer combination according to claim 1 or 2, characterized by, The No. 3 line is a three-phase line, and a sampling point is arranged on each phase line of the No. 3 line, the sampling module is connected on the sampling points of the No. 3 line through sampling data lines to obtain data information.

7. A zero-awareness power supply system using a low-voltage generator and a step-up transformer combination according to claim 3, characterized in that, The No. 1 motor, the No. 2 motor and the No. 3 motor are grounded.

8. A zero-awareness power supply system using a low voltage generator and a step-up transformer combination as claimed in claim 1, wherein, Further comprising a No. 1 overhead line sectional switch k1, the No. 1 overhead line sectional switch k1 is connected on the three-phase high-voltage overhead line, and the connection point of the No. 1 line and the three-phase high-voltage overhead line is located between the No. 1 overhead line sectional switch k1 and the No. 2 overhead line sectional switch k2.

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