Automatic voltage regulating device for terminal voltage of 10kV power distribution network

Abstract

The utility model belongs to the technical field of electric power supply, and particularly relates to a 10kV power distribution network tail end voltage automatic regulating device which comprises a container body, a switch cabinet, a power cabinet and a control device are arranged in the container body, a lightning arrester is arranged outside the container body, and a high-voltage sleeve is arranged on the side face of the container body. The high-voltage bushing is used for arranging a cable for connecting the input end of the switch cabinet with a 10kV power distribution network; the output end of the switch cabinet is connected with the power cabinet through a rectangular copper bus. A vacuum circuit breaker, a current transformer and a voltage transformer are arranged in the switch cabinet, a plurality of IGBT modules are arranged in the power cabinet, and two ends of each IGBT module are connected with an energy storage capacitor; the input end of the control device is connected with the output ends of the current transformer and the voltage transformer in the switch cabinet, and the output end of the control device is connected with the control end of the IGBT module in the power cabinet. According to the utility model, rapid voltage regulation of a 10kV line can be realized, and the problem that the corresponding speed of voltage regulation at the tail end of the line is slow is effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric power supply, and in particular relates to an automatic voltage regulating device at the end of a 10kV distribution network. Background Art

[0002] The distribution network system is closely related to social production and life, and the power quality of the distribution network directly affects the quality of production and life. At present, the distribution network system has a complex structure, some lines are long, and the load is heavy. When some impact loads suddenly occur at the end of some long lines, the voltage drops quickly, resulting in voltage flicker, which affects the power consumption of users. For this type of problem, there are currently two common solutions: one is to install capacitors at the head end of the line, that is, the substation end, to supplement the reactive power demand of the line and suppress the voltage drop, but when the voltage at the end of the line flickers, the capacitor at the head end will not work; the second is to install a series auto-coupling voltage-regulating transformer in the middle and rear sections of the line. When the terminal voltage is lower than the set value, the on-load voltage-regulating switch will adjust the gear and increase the voltage. This solution can play a good role in scenarios where the voltage changes slowly. If the voltage flickers, the voltage regulator action time is much longer than the voltage flicker time, and the response time requirements cannot be met.

[0003] In summary, it is necessary to develop a voltage regulating device that can quickly respond to and adjust the voltage and adapt to the deployment and installation methods of the distribution network. Utility Model Content

[0004] The utility model overcomes the deficiencies of the prior art and aims to solve the technical problem of providing a 10kV power distribution network terminal voltage automatic voltage regulating device to achieve automatic voltage regulation of the power distribution line.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a 10kV distribution network terminal voltage automatic voltage regulating device, comprising: a container body, a switch cabinet, a power cabinet and a control device are arranged in the container body, a lightning arrester is arranged outside the container body, and a high-voltage bushing is arranged on the side, and the high-voltage bushing is used to set a cable connecting the input end of the switch cabinet with the 10kV distribution network; the output end of the switch cabinet is connected to the power cabinet through a rectangular copper busbar;

[0006] The switch cabinet is provided with a vacuum circuit breaker, a current transformer and a voltage transformer, and the power cabinet is provided with a plurality of IGBT modules, and both ends of each IGBT module are connected with an energy storage capacitor;

[0007] The input end of the control device is connected to the output ends of the current transformer and the voltage transformer in the switch cabinet, and the output end of the control device is connected to the control end of the IGBT module in the power cabinet.

[0008] The 10kV distribution network terminal voltage automatic voltage regulating device also includes a protection device and a measuring device; the protection device input end is connected to the output end of the current transformer and the voltage transformer in the switch cabinet, and the output end is connected to the control end of the vacuum circuit breaker, which is used to collect the incoming line voltage and current of the switch cabinet and control the vacuum circuit breaker; the measuring device input end is connected to the output end of the current transformer and the voltage transformer in the switch cabinet, and the output end is connected to the control device, which is used to collect the incoming line current, voltage, and power signals of the switch cabinet in real time and send them to the background through the control device.

[0009] The 10kV distribution network terminal voltage automatic voltage regulating device also includes a drop-out fuse, and the cable led out of the high-voltage bushing is connected to the 10kV distribution network line through the drop-out fuse.

[0010] One end of the lightning arrester is grounded, and the other end is connected to the output end of the drop-out fuse.

[0011] The 10kV distribution network terminal voltage automatic voltage regulating device also includes a panel cabinet, and the control device is arranged in the panel cabinet.

[0012] A communication module and a DC power supply module are also arranged in the screen cabinet.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model provides a 10kV distribution network terminal voltage automatic voltage regulating device. By connecting a power cabinet to the 10kV line, the 10kV line can be quickly regulated, effectively solving the problem of slow voltage adjustment response speed at the line end. Moreover, through the container body integrated circuit equipment, the problems of long on-site equipment installation construction period and long power outage time are solved, thereby improving the level of power acquisition of distribution network users, improving the power quality of the power grid, improving power supply reliability, and reducing power outage time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A circuit schematic diagram of a 10kV distribution network terminal voltage automatic voltage regulating device provided by an embodiment of the utility model;

[0016] Figure 2 This is a planar installation layout diagram inside a container body in an embodiment of the utility model;

[0017] Figure 3 This is a schematic diagram of the three-dimensional structure of the container body in the embodiment of the utility model;

[0018] Figure 4 This is a control circuit principle block diagram of the automatic voltage regulating device in the embodiment of the utility model;

[0019] Figure 5 A schematic diagram of on-site installation of a 10kV distribution network terminal voltage automatic regulator provided in an embodiment of the utility model.

[0020] In the figure: 1 is a container body, 2 is a switch cabinet, 3 is a power cabinet, 4 is a lightning arrester, 5 is a high-voltage bushing, 6 is a cable, 7 is a panel cabinet, 8 is a drop-out fuse, 9 is a cable end, 10 is a 10kV line, and 11 is a tower. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] like Figures 1 to 5 As shown, the embodiment of the utility model provides a 10kV distribution network terminal voltage automatic voltage regulating device, including: a container body 1, wherein a switch cabinet 2, a power cabinet 3 and a control device are arranged in the container body 1, a lightning arrester 4 is arranged outside the container body 1, and a high-voltage bushing 5 is arranged on the side, and the high-voltage bushing 5 is used to set a cable connecting the input end of the switch cabinet 1 with the 10kV distribution network; the output end of the switch cabinet 2 is connected to the power cabinet 3 through a rectangular copper busbar; a vacuum circuit breaker DL, a current transformer CT and a voltage transformer PT are arranged in the switch cabinet 2, and a plurality of IGBT modules are arranged in the power cabinet 3, and a storage capacitor is connected to both ends of each IGBT module; the input end of the control device is connected to the output ends of the current transformer and the voltage transformer in the switch cabinet 2, and the output end of the control device is connected to the control end of the IGBT module in the power cabinet 2.

[0023] In this embodiment, the high-voltage bushing 5 extends from the side of the container body 1, which is convenient for connection with the 10kV line 10; the inner side of the high-voltage bushing 5 is directly connected to the upper end of the switch cabinet by a closed rectangular copper wire, passes through an isolation trolley, a vacuum circuit breaker, a current transformer, etc., returns to the top of the cabinet through the busbar lifting cabinet, and then connects to the power cabinet 3 through the rectangular copper busbar.

[0024] like Figure 3 As shown, in this embodiment, the keel of the container body 1 is made of all-steel material, and the top cover is a sloping roof to facilitate drainage; the outer surface is all made of stainless steel plates to meet the corrosion resistance requirements; the wall is filled with fireproof cotton to meet the fire protection requirements.

[0025] like Figure 4As shown, in this embodiment, the control device is connected to the output end of the voltage transformer PT to collect the line voltage and track it in real time. When it is found that the voltage flicker is lower than the strategy setting value, the control device controls the IGBT module in the power cabinet to operate and keep the voltage at a normal level.

[0026] The 10kV distribution network terminal voltage automatic voltage regulating device also includes a protection device and a measuring device; the input end of the protection device is connected to the output end of the current transformer CT and the voltage transformer PT in the switch cabinet 2, and the output end is connected to the control end of the vacuum circuit breaker, which is used to collect the incoming line voltage and current of the switch cabinet 2 and control the vacuum circuit breaker; the input end of the measuring device is connected to the output end of the current transformer and the voltage transformer in the switch cabinet 2, and the output end is connected to the control device, which is used to realize telemetry, telesignaling, and remote control functions. Specifically, it collects the incoming line current, voltage, and power signals of the switch cabinet 2 and sends them to the background through the control device. In addition, the control device can also receive instructions from the background or the main control end to adjust or act. Specifically, the protection device and the measuring device can be set in the switch cabinet 2.

[0027] like Figure 1 and 5 As shown, the 10kV distribution network terminal voltage automatic voltage regulating device described in this embodiment also includes a drop-out fuse 8. After the cable led out of the high-voltage bushing 5 rises to the top along the tower 11, it is connected to the 10kV distribution network line 10 through the drop-out fuse 8.

[0028] In addition, when this embodiment is installed on site, it is necessary to prepare a reinforced concrete foundation in advance to fix the container complete set of equipment; the on-site line tower leads the line down through the column drop-out fuse 8, and two methods can be selected to connect to the equipment high-voltage bushing: one is to use overhead bare wires for direct connection, and this solution requires the voltage regulating equipment to be installed near the line; the other is to use cable connection, and this solution has no special requirements for the installation location of the voltage regulating device.

[0029] like Figure 1 As shown, in this embodiment, one end of the lightning arrester 4 is grounded, and the other end is connected to the output end of the drop-out fuse 8 .

[0030] Furthermore, a 10kV distribution network terminal voltage automatic voltage regulating device of this embodiment also includes a panel cabinet 7, and the control device is arranged in the panel cabinet 7. In addition, a communication module and a DC power supply module are also arranged in the panel cabinet. The communication module can use optical fiber communication or GPRS wireless communication. By setting up the communication module, the voltage regulating device can have four remote functions and communication functions, and can perform online remote control switching, remote modification of voltage parameters, remote viewing of equipment status and other functions. Specifically, the panel cabinet 7 is a 800×600×2260 standard panel cabinet and is installed side by side with the power cabinet 3.

[0031] The working principle of the utility model is as follows: the switch cabinet 2 is connected to the 10kV line 10 through the cable 6 arranged upward along the pole tower 11, and the IGBT module and energy storage capacitor arranged in the power cabinet 3 respond quickly to the voltage flicker of the line to adjust and stabilize the voltage. Specifically, the control module controls the rapid conduction and shutdown of the IGBT element by using the microprocessor through the measured on-site voltage value, so as to control the phase and amplitude of the voltage on the output side of the bridge circuit, thereby achieving the purpose of regulating the voltage. The voltage regulating device arranged in the container body can greatly improve the efficiency of on-site equipment installation, and solve the problems of long on-site equipment installation construction period and long power outage time.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A 10kV distribution network terminal voltage automatic voltage regulating device, characterized in that: include: A container body (1), wherein a switch cabinet (2), a power cabinet (3) and a control device are arranged inside the container body (1); a lightning arrester (4) is arranged outside the container body (1); a high-voltage bushing (5) is arranged on the side; the high-voltage bushing (5) is used to set a cable connecting the input end of the switch cabinet (1) to a 10 kV power distribution network; the output end of the switch cabinet (2) is connected to the power cabinet (3) via a rectangular copper busbar; The switch cabinet (2) is provided with a vacuum circuit breaker, a current transformer and a voltage transformer, and the power cabinet (3) is provided with a plurality of IGBT modules, and both ends of each IGBT module are connected to an energy storage capacitor; The input end of the control device is connected to the output ends of the current transformer and the voltage transformer in the switch cabinet (2), and the output end of the control device is connected to the control end of the IGBT module in the power cabinet (2).

2. A 10kV distribution network terminal voltage automatic voltage regulating device according to claim 1, characterized in that: It also includes a protection device and a measuring device; the protection device input end is connected to the output end of the current transformer and the voltage transformer in the switch cabinet (2), and the output end is connected to the control end of the vacuum circuit breaker, and is used to collect the incoming line voltage and current of the switch cabinet (2) and control the vacuum circuit breaker; the measuring device input end is connected to the output end of the current transformer and the voltage transformer in the switch cabinet (2), and the output end is connected to the control device, and is used to collect the incoming line current, voltage, and power signals of the switch cabinet (2) in real time and send them to the background through the control device.

3. The 10kV distribution network terminal voltage automatic voltage regulating device according to claim 1 is characterized in that: It also comprises a drop-out fuse (8), through which the cable led out of the high-voltage bushing is connected to a 10 kV power distribution network line (10).

4. A 10kV distribution network terminal voltage automatic voltage regulating device according to claim 3, characterized in that: One end of the lightning arrester (4) is grounded, and the other end is connected to the output end of the drop-out fuse (8).

5. The 10kV distribution network terminal voltage automatic voltage regulating device according to claim 2 is characterized in that: It also includes a screen cabinet, and the control device is arranged in the screen cabinet.

6. A 10kV distribution network terminal voltage automatic voltage regulating device according to claim 5, characterized in that: A communication module and a DC power supply module are also arranged in the screen cabinet.

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