Monopole 31.5 kv composite combined electric appliance

Abstract

The utility model relates to a single-pole 31.5 kv composite combined electric appliance, which comprises a 31.5 kv tank type circuit breaker, a current transformer, a 31.5 kv isolation grounding switch and a sleeve, the 31.5 kv tank type circuit breaker is installed on a cross beam, the upper end face of the 31.5 kv tank type circuit breaker is provided with two phase column interfaces which are distributed in a V shape, and the upper end of each phase column interface is sequentially provided with a current transformer, a 31.5 kv isolation grounding switch and a sleeve from bottom to top. The 31.5 kv tank-type circuit breaker is provided with a circuit breaker shell wrapping all the elements, the current transformer is provided with a transformer shell wrapping all the elements, and the 31.5 kv isolation grounding switch is provided with an isolation switch shell wrapping all the elements. And the circuit breaker shell, the mutual inductor shell and the isolating switch shell are matched and fixed through flanges. The unipolar 31.5 kv composite combined electric appliance is suitable for a traction substation power supply system, and can automatically identify fault types, protect a power supply circuit and realize intelligent control of the circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of circuit breaker, especially relates to a single pole 31.5kv combined electric appliance. BACKGROUND

[0002] At present, the railway traffic of our country develops rapidly, and the railway power supply system is also developing continuously, in order to meet the power supply demand, there are four power supply modes at present: direct power supply mode (TR power supply mode), induced current transformer power supply mode (BT power supply mode), self-coupling transformer power supply mode (AT power supply mode), coaxial cable power supply mode (CC power supply mode).

[0003] The TR power supply mode is that the traction substation directly supplies power to the electric locomotive through the catenary, and the return current returns to the substation through the rail and the ground, and the single-phase power frequency alternating current is used to supply power to the locomotive, and the structure is simple, the equipment is less, the construction and operation maintenance are convenient, and the cost is low.

[0004] The circuit breaker, current transformer and isolation grounding switch applied in the traction substation generally adopt the open type AIS scheme, and belong to the floor-mounted structure, and have the following defects: many on-site devices, complicated wiring, complex construction and installation; large occupation area, high land acquisition cost; many exposed parts of the equipment, poor resistance to external environmental influence, easy to be affected by the climate and environmental conditions, not conducive to the safe and reliable operation of the system, and high requirements for the installation foundation and space layout. UTILITY MODEL CONTENT

[0005] The utility model solves the technical problem to provide a single pole 31.5kv combined electric appliance suitable for railway traction power supply system.

[0006] In order to solve the above technical problems, the technical scheme of the utility model is as follows: a single pole 31.5kv combined electric appliance, the innovation point is that: including 31.5kv tank type circuit breaker, current transformer, 31.5kv isolation grounding switch and bushing;

[0007] The 31.5kv tank type circuit breaker is installed on a cross beam, the upper end face of the 31.5kv tank type circuit breaker has two phase column interfaces distributed in V shape, the current transformer, the 31.5kv isolation grounding switch and the bushing are sequentially installed from bottom to top at the upper end of the phase column interface, the circuit breaker operating mechanism is installed on the lower end face of the cross beam, and the isolation grounding switch mechanism is installed on the side end of the cross beam;

[0008] The 31.5kv tank circuit breaker has a circuit breaker shell covering all the components of the 31.5kv tank circuit breaker, the current transformer has a transformer shell covering all the components of the current transformer, and the 31.5kv isolating grounding switch has a switch shell covering all the components of the 31.5kv isolating grounding switch, the circuit breaker shell and the transformer shell are fixed by flanges, and the transformer shell is fixed to the switch shell by flanges.

[0009] The bottom end of the cross beam is installed on a vertically arranged support, and a control cabinet is installed on the side end of the support by cooperation of a hoop, the control cabinet is connected to the circuit breaker operating mechanism and the isolating grounding switch mechanism through a line.

[0010] Further, the 31.5kv tank circuit breaker comprises a circuit breaker shell, an arc extinguishing chamber is arranged in the circuit breaker shell, the arc extinguishing chamber is filled with an insulating medium, and the arc extinguishing chamber is driven to move by the circuit breaker operating mechanism.

[0011] The 31.5kv isolating grounding switch comprises a switch shell and a conductive rod arranged in the switch shell, one side of the conductive rod extends from the bottom end of the switch shell and passes through the current transformer and is connected to the 31.5kv tank circuit breaker, and the conductive rod is driven to move by the isolating grounding switch mechanism.

[0012] The current transformer is of a through core structure, comprising a pouring coil, an inner support shell and a transformer shell, the inner support shell is in a cylindrical shape, has a through hole for passing the conductive rod at the center position of the inner support shell, and the transformer shell is sleeved on the outer wall of the inner support shell, and the transformer shell and the inner support shell jointly form a cavity for mounting the pouring coil.

[0013] The top end of the sleeve is connected to the primary overhead line, and a shielding cover is arranged in the sleeve.

[0014] Further, the current transformer, the 31.5kv isolating grounding switch and the sleeve on the same side are on the same inclined central axis, a vertical plane between the two phase column interfaces of the 31.5kv tank circuit breaker is defined as a reference plane, and the included angle between the central axis on any side and the reference plane is 10°.

[0015] The single-pole 31.5kv composite combined electrical apparatus has the advantages of high combination degree, light weight, modular installation, small space occupation, high reliability, maintenance-free, convenient transportation and installation, and the like.

[0016] For current transformers, a through-hole design is adopted, in which the cast coil and inner support shell are placed inside the transformer shell, which is completely sealed and has good insulation performance and weather resistance.

[0017] This utility model's single-pole 31.5kV composite switchgear can replace the traditional AIS solution. It integrates a 31.5kV tank-type circuit breaker, current transformer, and 31.5kV isolating grounding switch into a single module, which is enclosed in a container filled with insulating gas. The busbars, which are prone to failure, are arranged in an open manner. Compared with AIS products, this greatly reduces the number of grounding bushings and supports, which also reduces the probability of grounding flashover caused by contamination of the insulating supports, thus helping to improve operational reliability. It also shortens the wiring distance between equipment and saves the layout size of each piece of equipment. Compared with traditional AIS, it greatly reduces the longitudinal layout size of high-voltage equipment, reducing the floor space by 40-60%. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the single-pole 31.5kV composite combined electrical appliance of this utility model.

[0019] Figure 2 This is a schematic diagram of the circuit breaker housing of this utility model.

[0020] Figure 3 This is a schematic diagram of the current transformer in this utility model.

[0021] Figure 4 This is a schematic diagram of the 31.5kV isolating grounding switch in this utility model.

[0022] Figure 5 This is a schematic diagram of the sleeve in this utility model. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0024] like Figures 1-5 The single-pole 31.5kV composite switch shown includes a 31.5kV tank-type circuit breaker 4, a current transformer 3, a 31.5kV isolating grounding switch 2, and a bushing 1.

[0025] A 31.5kV tank-type circuit breaker 4 is installed on a crossbeam 10. The upper end face of the 31.5kV tank-type circuit breaker 4 has two phase post interfaces 42 distributed in a V-shape. From bottom to top, a current transformer 3, a 31.5kV isolating grounding switch 2 and a bushing 1 are installed on the upper end of the phase post interfaces 42. The circuit breaker operating mechanism 7 is installed on the lower end face of the crossbeam 10, and the isolating grounding switch mechanism 6 is installed on the side end of the crossbeam 10.

[0026] The 31.5kV tank-type circuit breaker 4 has a circuit breaker housing 41 that encloses all its components. The current transformer 3 has a current transformer housing 31 that encloses all its components. The 31.5kV isolating grounding switch 2 has an isolating switch housing 21 that encloses all its components. One side of the circuit breaker housing 41 and the current transformer housing 31 are connected and fixed via flanges, and the other side of the current transformer housing 31 is fixed to the isolating switch housing 21 via flanges. The internal cavities of the circuit breaker housing 41, the current transformer housing 31, and the isolating switch housing 21 are interconnected. Because the internal cavities of the circuit breaker housing 41, the current transformer housing 31, and the isolating switch housing 21 are interconnected, the 31.5kV isolating grounding switch 2 is also protected by an insulating medium, preventing problems such as porcelain insulator breakage, operational malfunction, overheating of the conductive circuit, and corrosion.

[0027] The bottom end of the crossbeam 10 is installed on the vertically set bracket 8. A control cabinet 9 is installed on the side end of the bracket 8 with the help of a clamp. The control cabinet 9 is connected to the circuit breaker operating mechanism 7 and the isolating grounding switch mechanism 6 through a line. The control cabinet 9 is connected to the bracket 8 by clamp, and there is no need to make a separate cement foundation for the control cabinet 9.

[0028] like Figure 2 As shown in the schematic diagram, the 31.5kV tank-type circuit breaker 4 includes a circuit breaker housing 41, and an arc-extinguishing chamber is provided inside the circuit breaker housing 41. The arc-extinguishing chamber is filled with an insulating medium, which is SF6 gas. The arc-extinguishing chamber is driven by the circuit breaker operating mechanism 7 through the cooperation of the transmission linkage. A density table 5 is also provided on the side of the circuit breaker housing 41 for measuring the density of the insulating medium in the arc-extinguishing chamber.

[0029] like Figure 4 As shown in the schematic diagram, the 31.5kV isolating grounding switch 2 includes an isolating switch housing 21 and a conductive rod built into the isolating switch housing 21. One side of the conductive rod extends from the bottom of the isolating switch housing, passes through the current transformer, and is connected to the 31.5kV tank-type circuit breaker. The conductive rod is driven by the isolating grounding switch mechanism 6 through the output connecting rod 22 to cut off the fault current through the insulating medium.

[0030] likeFigure 3 As shown in the schematic diagram, the current transformer 3 is a through core structure, including a pouring coil 32, an inner support shell 33 and a transformer shell 31, the inner support shell 33 is cylindrical, and has a through hole for passing through the conductive rod in the center position of the inner support shell 33, the transformer shell 31 is sleeved on the outer wall of the inner support shell 33, and a cavity for installing the pouring coil 32 is formed between the transformer shell 31 and the inner support shell 33, and the current transformer 3 uses the conductive rod of the 31.5kv isolation grounding switch 2 as a through core conductor. For the current transformer, the through core design is adopted, and the pouring coil 32 and the inner support shell 33 are all arranged in the transformer shell 31, which is completely sealed and has good insulation performance and weather resistance.

[0031] As shown in the schematic diagram, the top end of the bushing 1 is connected with the primary overhead line, and a shielding cover 11 is arranged in the bushing 1, which can meet the requirement of partial discharge ≤3pC under the test voltage 1.1*31.5kV. Figure 5

[0032] The current transformer 3, the 31.5kv isolation grounding switch 2 and the bushing 1 on the same side are located on the same inclined central axis, a vertical plane between the two phase column interfaces of the 31.5kv tank circuit breaker is defined as a reference plane, and the included angle between the central axis on any side and the reference plane is 10°.

[0033] The monopole 31.5kv combined electric appliance can replace the traditional AIS solution, integrates the 31.5kv tank circuit breaker, the current transformer, the 31.5kv isolation grounding switch and the like into a group of modules, and is integrally closed in a container filled with insulating gas, and the busbar prone to failure is arranged in an open type, compared with the AIS product, the number of ground insulation bushings and support columns is greatly reduced, the probability of ground flashover caused by pollution of the insulation support column is also reduced, and the operation reliability is improved; the indirect wiring distance between equipment is shortened, the arrangement size of each equipment is saved, compared with the traditional AIS, the longitudinal arrangement size of the high-voltage equipment is greatly reduced, and the occupied area is reduced by 40-60%.

[0034] Based on the improved structure, the combined electric appliance can be integrally assembled, debugged, modularly transported and installed on site in a manufacturing plant, and the on-site construction and installation are simpler and more convenient, and the amount of steel required by the substation support is reduced. In addition, the foundation is small, the engineering quantity is small, the amount of concrete is small, and the foundation work and cost expenditure are greatly reduced.

[0035] ​The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make minor changes or modifications to the disclosed technical content, or make equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change or modification of the above embodiments, which does not depart from the technical solution of the present application, is still within the scope of the technical solution of the present application.

Claims

1. A single-pole 31.5 kV composite combined electrical apparatus, characterized by: Includes 31.5kV tank-type circuit breakers, current transformers, 31.5kV isolating grounding switches and bushings; The 31.5kV tank-type circuit breaker is installed on a crossbeam. The upper end face of the 31.5kV tank-type circuit breaker has two phase column interfaces distributed in a V-shape. From bottom to top, a current transformer, a 31.5kV isolating grounding switch and a bushing are installed on the upper end of the phase column interfaces. The circuit breaker operating mechanism is installed on the lower end face of the crossbeam, and the isolating grounding switch mechanism is installed on the side end of the crossbeam. The 31.5kV tank-type circuit breaker has a circuit breaker housing that encloses all the components of the 31.5kV tank-type circuit breaker; the current transformer has a transformer housing that encloses all the components of the current transformer; and the 31.5kV isolating grounding switch has an isolating switch housing that encloses all the components of the 31.5kV isolating grounding switch. The circuit breaker housing and the transformer housing are connected and fixed on one side by a flange, and the other side of the transformer housing is fixed to the isolating switch housing by a flange. The bottom end of the crossbeam is mounted on a vertically installed bracket, and a control cabinet is installed on the side end of the bracket through a clamp. The control cabinet is connected to the circuit breaker operating mechanism and the isolating grounding switch mechanism through a line.

2. The unipolar 31.5 kV composite combined electrical apparatus according to claim 1, characterized in that: The 31.5kV tank-type circuit breaker includes a circuit breaker housing, and an arc-extinguishing chamber is provided inside the circuit breaker housing. The arc-extinguishing chamber is filled with an insulating medium, and the arc-extinguishing chamber is driven to operate by the circuit breaker operating mechanism. The 31.5kV isolating grounding switch includes an isolating switch housing and a conductive rod built into the isolating switch housing. One side of the conductive rod extends from the bottom of the isolating switch housing, passes through the current transformer, and is connected to the 31.5kV tank-type circuit breaker. The conductive rod is driven by the isolating grounding switch mechanism to operate. The current transformer has a through-hole structure, including a cast coil, an inner support shell, and a transformer outer shell. The inner support shell is cylindrical and has a through hole at the center for a conductive rod to pass through. The transformer outer shell is fitted onto the outer wall of the inner support shell, and a cavity for the cast coil to be installed is formed between the transformer outer shell and the inner support shell. The top end of the sleeve is connected to the primary overhead line, and a shielding cover is installed inside the sleeve.

3. The unipolar 31.5 kV composite combined electrical apparatus according to claim 1, characterized in that: The current transformer, 31.5kV isolating grounding switch and bushing on the same side are on the same inclined central axis. The vertical plane between the two phase column interfaces of the 31.5kV tank circuit breaker is defined as the reference plane, and the angle between the central axis on either side and the reference plane is 10°.

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