An integrated device of vacuum circuit breaker, mutual inductor and lightning arrester

Abstract

The utility model discloses an integrated device of integrated vacuum circuit breaker and mutual inductor, lightning arrester relates to electric power system application equipment technical field, and voltage mutual inductor, current mutual inductor, lightning arrester all realize integrated structure through the mounting chassis of fixed connection with vacuum circuit breaker base and vacuum circuit breaker, can realize equipment manufacturer preloading, has reduced the complexity of equipment field installation, has designed the support structure of current mutual inductor mainly with terminal support and insulating rod, has formed the continuous, reliable mechanical force transmission path of lightning arrester mounting chassis-vacuum circuit breaker base from current mutual inductor outlet terminal-terminal support-insulating rod, has effectively decomposed the continuous mechanical stress and torque of multi-winding CT to circuit breaker outlet terminal due to dead weight and vibration, fundamentally prevents the cracking at the junction, thereby avoids the safety accident caused by the damage of current mutual inductor, and the reliability and completeness of electric power system operation are enhanced significantly.

Description

Technical Field

[0001] This utility model relates to the field of power system application equipment technology, specifically an integrated device that combines a vacuum circuit breaker, a transformer, and a surge arrester. Background Technology

[0002] Circuit breakers, as crucial switching devices in power systems, can connect, carry, and disconnect current under normal and fault conditions, playing a role in control and protection of circuits. Among them, 10kV pole-mounted vacuum circuit breakers are widely used in distribution networks due to their advantages such as strong arc-extinguishing capability, small size, and long service life.

[0003] Since 2021, the Electric Power Research Institute (EPI) has released the "Standardized Design Scheme for 12kV Primary and Secondary Integrated Pole-Mounted Circuit Breakers and Distribution Automation Terminal Units (FTUs)," which integrates current transformers onto vacuum circuit breakers for unified installation. However, electromagnetic voltage transformers and drop-out arresters used on poles still require independent installation. This installation method has several drawbacks: firstly, each device needs to be installed and commissioned individually on-site, increasing construction difficulty and time costs, and requiring higher technical skills from installers; secondly, it requires a large footprint, with multiple devices installed separately, necessitating longer crossarms and larger line corridor space. Furthermore, currently, multi-winding current transformers rely solely on their connection to the circuit breaker for fixation, lacking additional support structures. During long-term operation, they are prone to loosening or even detachment due to environmental factors (such as wind and vibration) and their own weight, leading to equipment damage, power system failures, increased maintenance costs, and power outage risks. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides an integrated device that combines a vacuum circuit breaker, current transformer, and surge arrester. This simplifies the on-site installation process, reduces construction difficulty, and saves time and costs. The integrated installation design of the current transformer and surge arrester enhances the safety and stability of the equipment.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An integrated device comprising a vacuum circuit breaker, a voltage transformer, a current transformer, and a surge arrester is disclosed. A voltage transformer mounting bracket is fixedly mounted on one side of the vacuum circuit breaker's base, and a current transformer mounting bracket and a surge arrester mounting bracket are fixedly mounted on the other side. The voltage transformer, current transformer, and surge arrester are respectively fixed on their respective mounting brackets and electrically connected to the vacuum circuit breaker. A terminal bracket is fixedly connected below the outgoing terminal of the current transformer, through which the copper rod of the vacuum circuit breaker passes. An insulating rod is fixedly connected below the terminal bracket, and the other end of the insulating rod is fixedly mounted on the surge arrester mounting bracket. The insulating rod supports the outgoing terminal via the terminal bracket. The surge arrester is a drop-out surge arrester. A diagonal brace is provided on each side of the vacuum circuit breaker's base, and the other end of the diagonal brace is fixedly connected to the bottom surface of the surge arrester mounting bracket, forming a triangular stable support structure for the surge arrester.

[0006] The voltage transformer mounting base consists of two support bends and a mounting plate. The two support bends are symmetrically fixed on the bottom surface of the mounting plate and are fixedly connected to the base of the vacuum circuit breaker. The mounting plate has two rows of four mounting slots symmetrically arranged on both sides. The inner row of slots penetrates the mounting plate and the support bends to achieve universal installation of voltage transformers of different sizes.

[0007] The beneficial effects of this utility model are as follows: 1. A support structure for the current transformer, mainly consisting of terminal brackets and insulating rods, was designed, forming a continuous and reliable mechanical force transmission path from the current transformer output terminals to the terminal brackets, insulating rods, surge arrester mounting base, and vacuum circuit breaker base. This effectively decomposes the continuous mechanical stress and torque caused by the weight and vibration of the multi-winding CT on the circuit breaker output terminals, fundamentally preventing cracking at the connection points, effectively supporting the current transformer, enhancing its stability, and avoiding loosening or detachment due to environmental factors and current surges, thereby preventing damage to the current transformer and safety accidents. 2. Voltage transformers, current transformers, and surge arresters are all integrated with the vacuum circuit breaker through a mounting frame that is fixedly connected to the vacuum circuit breaker base. This allows for pre-installation by the equipment manufacturer, reducing the complexity of on-site installation. Users do not need to connect and fix the equipment, reducing the possibility of installation errors and avoiding equipment damage caused by wiring errors. This completely changes the traditional installation mode of independent installation of each piece of equipment and reliance on crossarms for load-bearing, forming a unified, high-strength load-bearing frame and improving the safety and stability of the equipment. 3. The surge arrester adopts a drop-out surge arrester, which has a stronger protection capability. The design of the surge arrester mounting base with a diagonal brace structure can effectively resist the strong impact force generated when the drop-out surge arrester is activated and the swaying caused by wind load over the years, prevent fatigue deformation of the base frame, and ensure the long-term stability of the surge arrester. 4. The adjustable size and universal installation design of the voltage transformer allows for continuous and stepless adjustment of the installation position in both horizontal and vertical directions. This not only adapts to equipment of different sizes and brands, but also allows for precise fine-tuning of the installation position, ensuring that the arc, length, and safe distance to ground of the primary high-voltage connection conductor are in the optimal state, avoiding the inconvenience and errors caused by on-site conductor cutting. 5. This utility model has a simple and practical design, is easy and quick to install, saves installation space, improves installation efficiency, significantly enhances the reliability and integrity of power system operation, and extends the service life of equipment, making it suitable for large-scale promotion and application. Attached Figure Description

[0008] Figure 1 This is a side view of the present invention. Figure 2 This is a schematic diagram of the present invention viewed from below. Figure 3 This is a schematic diagram of the overall state of this utility model; The component names represented by each number are as follows: 1-Vacuum circuit breaker, 2-Voltage transformer, 3-Current transformer, 4-Surge arrester, 21-Voltage transformer mounting base, 31-Current transformer mounting base, 41-Surge arrester mounting base, 11-Base, 12-Diagonal brace, 32-Outgoing terminal block, 33-Terminal bracket, 34-Insulating rod, 211-Supporting bend plate, 212-Mounting plate, 213-Long slot. Detailed Implementation

[0009] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: like Figure 1-3As shown, this integrated device combining a vacuum circuit breaker, current transformer, and surge arrester includes a vacuum circuit breaker 1, a voltage transformer 2, a current transformer 3, and a surge arrester 4. A voltage transformer mounting bracket 21 is fixedly mounted on one side of the base 11 of the vacuum circuit breaker 1, and a current transformer mounting bracket 31 and a surge arrester mounting bracket 41 are fixedly mounted on the other side. The voltage transformer 2, current transformer 3, and surge arrester 4 are respectively fixed on their corresponding mounting brackets and electrically connected to the vacuum circuit breaker 1. The copper rod of the vacuum circuit breaker 1 passes through the current transformer 3 and has an outgoing line at its end. A terminal bracket 33 is fixedly connected below the terminal 32, and an insulating rod 34 is fixedly connected below the terminal bracket 33. The other end of the insulating rod 34 is fixedly mounted on the arrester mounting base 41. The insulating rod 34 supports the outgoing terminal 32 through the terminal bracket 33. The arrester 4 is a drop-out arrester. A diagonal brace 12 is provided on each side of the base 11 of the vacuum circuit breaker 1. The other end of the diagonal brace 12 is fixedly connected to the bottom surface of the arrester mounting base 41, forming a triangular stable support structure for the arrester 4.

[0010] In a preferred embodiment, the voltage transformer mounting base 21 consists of two supporting bent plates 211 and a mounting plate 212. The two supporting bent plates 211 are symmetrically fixed on the bottom surface of the mounting plate 212 and are fixedly connected to the base 11 of the vacuum circuit breaker 1. The mounting plate 212 has two rows of four mounting slots 213 symmetrically arranged on both sides. The row of slots 213 on the inner side penetrates the mounting plate 212 and the supporting bent plates 211, allowing the voltage transformer 2 to be continuously and steplessly adjusted in the horizontal and vertical directions, realizing universal installation of three commonly used voltage transformer sizes: 160×160, 180×180, and 160×180.

[0011] In the specific implementation of this utility model, taking the installation of a 10kV pole-mounted vacuum circuit breaker as an example, there are two voltage transformers 2. The primary high-voltage side is connected to the incoming terminal of the pole-mounted vacuum circuit breaker 1 through a high-voltage insulated wire, and the voltages of lines AB and BC are collected respectively. The high-voltage side of the surge arrester 4 is connected to the terminal of the vacuum circuit breaker 1 through a high-voltage insulated wire. The surge arrester 4 is connected to the surge arrester mounting base 41 by bolts, which effectively saves installation space.

[0012] The vacuum circuit breaker 1 serves as the core structural base and conductive hub of the entire integrated device. The voltage transformer mounting base 21, current transformer mounting base 31, and surge arrester mounting base 41 are directly or indirectly rigidly connected to the base 11 housing of the vacuum circuit breaker 1, forming a unified, high-strength load-bearing frame. A diagonal brace 12 is designed for triangular stability support, ensuring the overall installation stability of the device. Simultaneously, the stable support structure for the current transformer 3, composed of the outgoing terminal 32, terminal bracket 23, and insulating rod 24, effectively prevents damage to the current transformer 3 and avoids safety accidents.

[0013] In the electrical wiring, voltage transformer 2 is connected to the circuit breaker incoming terminal via the PT primary connection line, and surge arrester 4 is connected to the circuit breaker outgoing terminal 32 via the surge arrester primary connection line.

[0014] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. An integrated device comprising a vacuum circuit breaker, current transformers, and surge arresters, comprising a vacuum circuit breaker (1), two voltage transformers (2), three current transformers (3), and three surge arresters (4), wherein two voltage transformer mounting frames (21) are fixedly installed on one side of the base (11) of the vacuum circuit breaker (1), and a current transformer mounting frame (31) and a surge arrester mounting frame (41) are fixedly installed on the other side; the voltage transformers (2), current transformers (3), and surge arresters (4) are respectively fixed on their corresponding mounting frames and electrically connected to the vacuum circuit breaker (1), characterized in that, The copper rod of the vacuum circuit breaker (1) passes through the current transformer (3) and is fixedly connected to the terminal bracket (33) below the outgoing terminal (32). The terminal bracket (33) is fixedly connected to the bottom of the insulating rod (34). The other end of the insulating rod (34) is fixedly set on the arrester mounting base (41). The insulating rod (34) supports the outgoing terminal (32) through the terminal bracket (33). The arrester (4) is a drop-out arrester. The base (11) of the vacuum circuit breaker (1) is provided with a diagonal brace (12) on each side. The other end of the diagonal brace (12) is fixedly connected to the bottom surface of the arrester mounting base (41) to form a triangular stable support structure for the arrester (4).

2. The integrated device for a vacuum circuit breaker, instrument transformer, and surge arrester according to claim 1, characterized in that, The voltage transformer mounting base (21) consists of two support bends (211) and a mounting plate (212). The two support bends (211) are symmetrically fixed on the bottom surface of the mounting plate (212) and fixedly connected to the base (11) of the vacuum circuit breaker (1). The mounting plate (212) has two rows of four mounting slots (213) symmetrically arranged on both sides. The row of slots (213) on the inner side penetrates the mounting plate (212) and the support bends (211) to achieve universal installation of voltage transformers of different sizes.

Images