An experimental device for measuring the arc parameters between the contacts of a gas circuit breaker

Abstract

The present invention provides an experimental device for measuring the arc parameters between the breaking contacts of a gas circuit breaker. The fixed nozzle scheme is adopted, and during the entire opening process, the arc chamber nozzle and the same-side contact are stationary relative to the housing, which helps the imaging device to collect the changing form of the arc inside the nozzle. The bilateral independent mechanisms are used to drive the movement of one side contact and the other side piston independently, and by controlling the two sides of the mechanisms, the adjustment of the contact movement speed, gas flow rate, and gas flow is achieved. An auxiliary contact is added at the rear end of the self-actuated arc contact to stabilize the root of the arc at the static-side contact end during the opening process at the auxiliary contact, which is beneficial to the imaging of the arc form. The present invention adopts bilateral independent mechanisms to drive the arc contact and the pressure cylinder piston to move respectively, and adjusts the relative movement speed of the closing and opening contacts and the gas blowing speed and flow rate between the breaking contacts during opening respectively, and can simulate the arc extinguishing state of the arc chamber contacts under different speeds and gas blowing conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker test equipment, and specifically to an experimental device for measuring arc parameters between the contacts of a gas circuit breaker. Background Art

[0002] Currently, for measuring the internal gas parameters of the arc extinguishing chamber of a gas circuit breaker, it is mainly based on traditional engineering prototypes, improving individual parts inside the circuit breaker, or adding some structures to reduce the gas consumption or experimental error during repeated test measurements. However, almost all test schemes use the self-acting arc contact of the traditional test prototype as the moving contact, which is fixed to the nozzle at the same time. During tests such as arc shape testing, since the nozzle and the moving contact are in a relative motion state with respect to the tank body and the imaging instrument, it affects the focusing of the instrument and the imaging field of view during the arc extinguishing process, and affects the accuracy of the measurement results. In addition, because the electric breakdown theory is based on probability statistics and the arc breaking shape develops randomly, during the arc breaking process, the arc root part of the arc will be randomly distributed on the surface of the self-acting arc contact used in the engineering prototype. Therefore, high-precision high-speed imaging equipment often fails to focus accurately due to the change in the starting position of the arc, resulting in the failure of shooting during the breaking process.

[0003] An arc test device (CN201610199707.9) provides an arc test device. The arc test device includes a closed chamber, inside which a static arc contact, a moving arc contact, and a nozzle that moves with the moving arc contact are provided. The feature of this invention is that the nozzle used is a transparent nozzle, and a first transparent observation window for observing the arc generated between the static arc contact and the moving arc contact is provided on the shell of the closed chamber corresponding to the positions of the static and moving arc contacts. The transparent nozzle does not block the arc and does not affect the observation of the arc shape. The complete arc shape can be observed through the first transparent observation window.

[0004] The test scheme adopted in an arc test device (CN201610199707.9) still uses the self-acting arc contact of the traditional test prototype as the moving contact, which is fixed to the nozzle at the same time. During tests such as arc shape testing, since the nozzle and the moving contact are in a relative motion state with respect to the tank body and the imaging instrument, it affects the focusing of the instrument and the imaging field of view during the arc extinguishing process, and affects the accuracy of the measurement results. At the same time, due to the limitation of the observation range of the observation window, in the case of a large opening distance, the overall state from the initial arc starting to the final arc extinguishing cannot be observed. At the same time, an arc test device also does not pay attention to the situation of shooting failure caused by inaccurate focusing that may occur when the starting point position of the arc changes greatly on the arc contact. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the present invention provides an experimental device for measuring the arc parameters between the breaking ports of a gas circuit breaker. The experimental device has a simple structure and is convenient to operate. It adopts a fixed nozzle scheme, and during the entire opening process, the arc chamber nozzle and the same-side contact are stationary relative to the housing, which helps the imaging device to collect the changing form of the arc inside the nozzle.

[0006] The present invention is realized through the following technical solutions:

[0007] An experimental device for measuring the arc parameters between the breaking ports of a gas circuit breaker, comprising a moving-side II operating mechanism, a test circuit breaker, and a moving-side I operating mechanism; the test circuit breaker includes a circuit breaker body and a control device, the control device is electrically connected to the circuit breaker body and is used to control the circuit breaker body, the circuit breaker body includes a housing, and an arc chamber arranged inside the housing; the arc chamber includes a moving-side I arc contact assembly and a moving-side II arc contact assembly connected coaxially;

[0008] The moving-side I arc contact assembly includes a moving-side I support assembly, a moving-side I pull rod assembly, a cylinder, a piston, an auxiliary contact, a moving-side I arc contact, and a nozzle; one end of the moving-side I support assembly is fixed inside the housing, and the other end is connected to the cylinder, one end of the cylinder is equipped with a nozzle, one end of the moving-side I pull rod assembly passes through the moving-side I support assembly and extends into the cylinder, the piston is connected to the end of the moving-side I pull rod assembly inside the cylinder, and the other end of the moving-side I pull rod assembly extends out of the housing along the moving-side I support assembly and is connected to the moving-side I operating mechanism; a contact mounting seat is arranged inside the cylinder, the contact mounting seat is located between the piston and the inner end face of the nozzle, the moving-side I arc contact is assembled on the contact mounting seat and is located inside the nozzle, the auxiliary contact is arranged inside the moving-side I arc contact, and the mounting end is assembled on the contact mounting seat;

[0009] The moving-side II arc contact assembly includes a moving-side II support assembly, a moving-side II pull rod assembly, and a moving-side II arc contact; one end of the moving-side II support assembly is fixed inside the housing, the moving-side II arc contact is assembled on one end of the moving-side II pull rod assembly, and extends into the nozzle along the moving-side II support assembly and contacts the moving-side I arc contact, and the other end of the moving-side II pull rod assembly extends out of the housing along the moving-side II support assembly and is connected to the moving-side II operating mechanism;

[0010] The control device drives the moving-side II operating mechanism and the moving-side I operating mechanism respectively, and by controlling the opening and closing sequence and speed of the operating switch, the simulation of different opening and closing speeds and gas-blowing conditions during the opening and closing of the circuit breaker is realized.

[0011] Preferably, the auxiliary contact includes a limit rod, a sleeve, an installation slider, an auxiliary contact head, and a spring. The sleeve is assembled inside the moving-side I arc contact and fastened to the moving-side I arc contact by threads. The installation slider and the auxiliary contact head are assembled inside the sleeve. One end of the limit rod extends into the sleeve and is fixedly connected to the installation slider by threads. The other end of the installation slider is connected to the auxiliary contact head. When the circuit breaker is closed, the auxiliary contact head contacts the moving-side II arc contact. The limit rod is sleeved with a spring inside the sleeve.

[0012] Further, the diameter of the auxiliary contact head is smaller than that of the moving-side I arc contact, and when the circuit breaker is in the open state, the auxiliary contact head protrudes at least 0.5 mm from the surface of the moving-side I arc contact inside the moving-side I arc contact.

[0013] Preferably, the moving-side II support assembly includes a moving-side II insulating support and a moving-side II support base. One end of the moving-side II insulating support is assembled on the housing, and the other end is connected to the moving-side II support base. The moving-side II arc contact sequentially passes through the moving-side II insulating support and the moving-side II support base on the moving-side II pull rod assembly and extends into the nozzle to contact the moving-side I arc contact. The other end of the moving-side II pull rod assembly extends out of the housing and is connected to the moving-side II operating mechanism. Among them, the moving-side II pull rod assembly includes a moving-side II insulating pull rod and a moving-side II steel pull rod. One end of the moving-side II insulating pull rod in the moving-side II insulating support extends out of the housing and is connected to the moving-side II operating mechanism, and the other end extends into the moving-side II support base and is connected to the moving-side II steel pull rod. The moving-side II arc contact is assembled on the moving-side II steel pull rod and extends into the nozzle through the moving-side II steel pull rod to contact the moving-side I arc contact.

[0014] Preferably, the moving-side I support assembly includes a moving-side I support base and a moving-side I insulating support. One end of the moving-side I insulating support is assembled on the housing, and the other end is connected to the moving-side I support base. The other end of the moving-side I support base is connected to the cylinder. One end of the moving-side I pull rod assembly sequentially passes through the moving-side I insulating support and the moving-side I support base and extends into the cylinder to be connected to the piston, and the other end extends out of the housing and is connected to the moving-side I operating mechanism. Among them, the moving-side I pull rod assembly includes a moving-side I steel pull rod and a moving-side I insulating pull rod. One end of the moving-side I insulating pull rod in the moving-side I insulating support extends out of the housing and is connected to the moving-side I operating mechanism. The other end is connected to the moving-side I steel pull rod. The moving-side I steel pull rod extends into the cylinder in the moving-side I support base and is connected to the piston.

[0015] Preferably, the control device includes a secondary control circuit unit and a controller. The input end of the controller is connected to a signal input module, and the signal input module is connected to the secondary control circuit unit for inputting an operation command to the controller. The output end of the controller is connected to a drive module, and the drive module is respectively assembled on the moving-side I operating mechanism and the moving-side II operating mechanism for controlling the opening and closing actions of the circuit breaker.

[0016] Furthermore, the moving-side I arc contact is a self-actuating arc contact; the moving-side II arc contact is a rod-shaped arc contact.

[0017] Preferably, at least two observation windows are provided at the installation position of the housing corresponding to the nozzle for data acquisition of the measuring device.

[0018] Preferably, the nozzle is made of a transparent material and fixed to the cylinder.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] The present invention provides an experimental device for measuring the arc parameters between the breaking ports of a gas circuit breaker. Adopting a fixed nozzle scheme, during the entire opening process, the arc chamber nozzle and the same-side contacts are stationary relative to the housing, which helps the photographing device to collect the changing shape of the arc inside the nozzle; adopting a double-sided independent mechanism to drive one side of the contacts and the other side of the piston to move independently, and adjusting the moving speed of the contacts, the gas flow rate, and the gas flow through the control of the two sides of the mechanism; adding an auxiliary contact at the rear end of the self-actuating arc contact to stabilize the root of the arc at the static-side contact end during the opening process, which is beneficial to the photographing of the arc shape. The present invention adopts a double-sided independent mechanism to drive the arc contacts and the piston of the pressure cylinder to move respectively, and adjusts the relative moving speed of the closing and opening contacts and the gas blowing speed and flow rate between the breaking ports during opening respectively, and can simulate the arc extinguishing state of the arc chamber contacts under different speeds and gas blowing conditions.

[0021] Furthermore, an auxiliary contact is provided at the self-actuating arc contact to stabilize the arc root during the opening process at the auxiliary contact, which is beneficial to the capture and photographing of the arc shape.

[0022] Furthermore, in one structure of the auxiliary contact, the sleeve is assembled inside the moving-side I arc contact and fastened to the moving-side I arc contact by threads, ensuring the stability of the sleeve installation. The installation slider and the auxiliary contact are assembled inside the sleeve. One end of the limiting rod extends into the sleeve and is fixedly connected to the installation slider by threads; the other end of the installation slider is connected to the auxiliary contact; the auxiliary contact contacts the moving-side II arc contact; a spring is sleeved on the limiting rod inside the sleeve. This structure is simple and convenient for installation.

[0023] Furthermore, in another structure of the auxiliary contact, it further includes a spring fixing column and a spring fixing cover. The spring is sleeved on the spring fixing column. The spring fixing column is used to guide the movement path of the spring, and the spring fixing cover is used to provide a mounting base for the spring and provide spring support during closing. In this auxiliary contact, the spring is at a certain distance from the current path and is located in the rear space of the self-actuating contact, which is beneficial to heat dissipation and has a lower requirement for the heat resistance of the spring compared to the former. At the same time, multiple strands of springs can be provided to increase the pre-pressure between the auxiliary contact and the rod-shaped arc contact at the beginning, which is beneficial to the stable contact with the rod-shaped arc contact before the initial breaking point during opening.

[0024] Furthermore, the diameter of the auxiliary contact is smaller than that of the moving-side I arc contact, and when the circuit breaker is in the open state, the auxiliary contact protrudes at least 0.5 mm from the surface of the moving-side I arc contact, facilitating contact with the moving-side II arc contact to achieve opening and closing operations.

[0025] Furthermore, the moving-side II support assembly and the moving-side I support assembly provide stable support for the arc extinguishing chamber inside the housing, ensuring the opening and closing operations.

[0026] Furthermore, the secondary control circuit unit in the control device controls and adjusts the two independent operating mechanisms, and by setting the opening and closing timing and speed of the operating switch, it simulates different opening and closing speeds and gas blowing conditions when the circuit breaker opens and closes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the experimental device for measuring the arc parameters between the breaker contacts of a gas circuit breaker provided by the present invention;

[0028] Figure 2 is Figure 1 an enlarged view of part A in

[0029] Figure 3 is a schematic diagram of the structure of the first auxiliary contact in the present invention;

[0030] Figure 4 is a schematic diagram of the structure of the second auxiliary contact in the present invention;

[0031] Figure 5 is a flowchart of the operation of the experimental device in the present invention.

[0032] In the figure: 1 - moving-side II operating mechanism; 2 - moving-side II insulating pull rod; 3 - moving-side II insulating support; 4 - moving-side II steel pull rod; 5 - moving-side II support seat; 6 - moving-side II arc contact; 7 - housing; 8 - observation window; 9 - nozzle; 10 - moving-side I arc contact; 11 - auxiliary contact; 12 - cylinder; 13 - piston; 14 - moving-side I steel pull rod; 15 - moving-side I support seat; 16 - moving-side I insulating support; 17 - moving-side I insulating pull rod; 18 - moving-side I operating mechanism; 19 - control device; 111 - limit rod; 112 - sleeve; 113 - mounting slider; 114 - auxiliary contact; 115 - spring; 116 - spring fixing column; 117 - spring fixing cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0035] The present invention will be further described in detail below with reference to the accompanying drawings:

[0036] See Figure 1 and Figure 2 , the present invention provides an experimental device for measuring the arc parameters between the contacts of a gas circuit breaker. The experimental device has a simple structure and is easy to operate. It adopts a fixed nozzle scheme, and during the entire opening process, the nozzle of the arc extinguishing chamber and the same-side contact are stationary relative to the housing, which helps the imaging device to collect the changing shape of the arc inside the nozzle.

[0037] Specifically, the experimental device for measuring the arc parameters between the contacts of a gas circuit breaker includes a moving-side II operating mechanism 1, a test circuit breaker, and a moving-side I operating mechanism 18; the test circuit breaker includes a circuit breaker body and a control device 19, and the control device 19 is electrically connected to the circuit breaker body for controlling the circuit breaker body. The circuit breaker body includes a housing 7 and an arc extinguishing chamber provided inside the housing 7; the arc extinguishing chamber includes a moving-side I arc contact assembly and a moving-side II arc contact assembly connected coaxially.

[0038] The moving-side I arc contact assembly includes a moving-side I support assembly, a moving-side I pull rod assembly, a cylinder 12, a piston 13, an auxiliary contact 11, a moving-side I arc contact 10, and a nozzle 9; one end of the moving-side I support assembly is fixed inside the housing 7, and the other end is connected to the cylinder 12. One end of the cylinder 12 is equipped with the nozzle 9. One end of the moving-side I pull rod assembly passes through the moving-side I support assembly and extends into the cylinder 12. The piston 13 is connected to the end of the moving-side I pull rod assembly inside the cylinder 12. The other end of the moving-side I pull rod assembly extends out of the housing 7 along the moving-side I support assembly and is connected to the moving-side I operating mechanism 18. A contact mounting seat is provided inside the cylinder 12, which is located between the piston 13 and the inner end face of the nozzle 9. The moving-side I arc contact 10 is assembled on the contact mounting seat and is located inside the nozzle 9. The auxiliary contact 11 is arranged inside the moving-side I arc contact 10, and its mounting end is assembled on the contact mounting seat.

[0039] The moving-side II arc contact assembly includes a moving-side II support assembly, a moving-side II pull rod assembly, and a moving-side II arc contact 6. One end of the moving-side II support assembly is fixed inside the housing 7. The moving-side II arc contact 6 is assembled at one end of the moving-side II pull rod assembly and extends into the nozzle 9 along the moving-side II support assembly to contact the moving-side I arc contact 10. The other end of the moving-side II pull rod assembly extends out of the housing 7 along the moving-side II support assembly and is connected to the moving-side II operating mechanism 1.

[0040] The control device 19 drives the moving-side II operating mechanism 1 and the moving-side I operating mechanism 18 respectively, and by controlling the opening and closing sequence and speed of the operating switch, it realizes the simulation of different opening and closing speeds and air-blowing conditions during the opening and closing of the circuit breaker.

[0041] Specifically, according to Figure 3 As shown, the auxiliary contact 11 includes a limit rod 111, a sleeve 112, a mounting slider 113, an auxiliary contact tip 114, and a spring 115. The sleeve 112 is assembled inside the moving-side I arc contact 10 and is fastened to the moving-side I arc contact 10 by threads. The mounting slider 113 and the auxiliary contact tip 114 are assembled inside the sleeve 112. One end of the limit rod 111 extends into the sleeve 112 and is fixedly connected to the mounting slider 113 by threads, and the other end contacts the contact mounting seat. The other end of the mounting slider 113 is connected to the auxiliary contact tip 4. When the circuit breaker closes, the auxiliary contact tip 4 contacts the moving-side II arc contact. The limit rod 111 is sleeved with a spring 115 inside the sleeve 112.

[0042] The present invention can also provide another auxiliary contact 11. According to Figure 4As shown in the figure, the auxiliary contact 11 includes a limit rod 111, a sleeve 112, a mounting slider 113, an auxiliary contact 114, a spring 115, a spring fixing column 116 and a spring fixing cover 117; the sleeve 112 is assembled in the moving-side I arc contact 10 and fastened to the moving-side I arc contact 10 by threads. One end of the spring fixing cover 117 is assembled on the sleeve 112, and the other end is connected to the contact mounting seat. The spring fixing column 116 is inside the spring fixing cover 117, with one end fixed on the inner wall of the spring fixing cover 117 and the other end connected to the sleeve 112. The limit rod 111 is slidably arranged in the spring fixing column 116. The spring 115 is sleeved on the spring fixing column 116. The other end of the limit rod 111 is connected to the mounting slider 113 by threads. The auxiliary contact 114 is assembled at the other end of the mounting slider 113. When the circuit breaker is closed, the auxiliary contact 114 contacts the moving-side II arc contact.

[0043] Among them, the diameter of the auxiliary contact 114 is smaller than that of the moving-side I arc contact 10, and when the circuit breaker is in the open state, the auxiliary contact 114 protrudes at least 0.5 mm from the surface of the moving-side I arc contact 10 inside the moving-side I arc contact 10.

[0044] The auxiliary contact 114 is fixed to the mounting slider 113 by screws, and the limit rod 111 is fixed to the mounting slider 113 by threads; the mounting slider 113 is located inside the sleeve 112 and can slide inside the sleeve 112.

[0045] The sleeve 112 is installed inside the self-actuating arc contact and fastened to the self-actuating arc contact by threads. The limit between the rear end of the sleeve 112 and the arc contact mounting seat needs to be considered for convenient fixation during installation.

[0046] The diameter of the auxiliary contact is smaller than the inner edge diameter of the arc contact of the static-side arc contact without applying an external force, and the auxiliary contact should protrude at least 0.5 mm from the upper surface of the static-side arc contact when the circuit breaker is in the open state;

[0047] In the present invention, an auxiliary contact is provided at the self-actuating arc contact, so that the arc root is stabilized at the auxiliary contact during the breaking process, which is beneficial to the capture and shooting of the arc shape.

[0048] In the present invention, the bilateral independent mechanism includes an operating mechanism connected to the rod-shaped arc contact and an operating mechanism connected to the piston of the puffer chamber. Among them, the operating mechanism connected to the rod-shaped arc contact can be an electric, spring or hydraulic operating mechanism, which has an independent control and adjustment function and drives the rod-shaped contact side to move during the opening and closing process of the circuit breaker to complete the speed adjustment function of opening and closing; the operating mechanism connected to the piston rod of the puffer chamber can be an electric, spring or hydraulic operating mechanism, which has an independent control and adjustment function and drives the piston rod side of the puffer chamber to move during the opening and closing process of the circuit breaker to complete the function of providing different speed gas blowing amounts between the breaker contacts.

[0049] Specifically, the moving-side II support assembly includes a moving-side II insulating support 3 and a moving-side II support base 5. One end of the moving-side II insulating support 3 is assembled on the housing 7, and the other end is connected to the moving-side II support base 5. The moving-side II arc contact 6 passes through the moving-side II insulating support 3 and the moving-side II support base 5 in sequence on the moving-side II pull rod assembly and extends into the nozzle 9 to contact the moving-side I arc contact 10. The other end of the moving-side II pull rod assembly extends out of the housing 7 and is connected to the moving-side II operating mechanism 1; among them, the moving-side II pull rod assembly includes a moving-side II insulating pull rod 2 and a moving-side II steel pull rod 4; one end of the moving-side II insulating pull rod 2 extends out of the housing 7 and is connected to the moving-side II operating mechanism 1 within the moving-side II insulating support 3, and the other end extends into the moving-side II support base 5 and is connected to the moving-side II steel pull rod 4. The moving-side II arc contact 6 is assembled on the moving-side II steel pull rod 4 and extends into the nozzle 9 through the moving-side II steel pull rod 4 to contact the moving-side I arc contact 10.

[0050] Specifically, the moving-side I support assembly includes a moving-side I support base 15 and a moving-side I insulating support 16; one end of the moving-side I insulating support 16 is assembled on the housing 7, and the other end is connected to the moving-side I support base 15. The other end of the moving-side I support base 15 is connected to the cylinder 12; one end of the moving-side I pull rod assembly passes through the moving-side I insulating support 16 and the moving-side I support base 15 in sequence and extends into the cylinder 12 to be connected to the piston 13, and the other end extends out of the housing 7 and is connected to the moving-side I operating mechanism 18; among them, the moving-side I pull rod assembly includes a moving-side I steel pull rod 14 and a moving-side I insulating pull rod 17; one end of the moving-side I insulating pull rod 17 extends out of the housing 7 and is connected to the moving-side I operating mechanism 18 within the moving-side I insulating support 16. The other end is connected to the moving-side I steel pull rod 14, and the moving-side I steel pull rod 14 extends into the cylinder 12 within the moving-side I support base 15 and is connected to the piston 13.

[0051] Specifically, the control device 19 includes a secondary control circuit unit and a controller; the input end of the controller is connected to a signal input module, and the signal input module is connected to the secondary control circuit unit for inputting an operation command to the controller; the output end of the controller is connected to a drive module, and the drive module is respectively assembled on the moving-side I operating mechanism 18 and the moving-side II operating mechanism 1 for controlling the opening and closing actions of the circuit breaker.

[0052] In the present invention, the moving-side I arc contact 10 is a self-actuating arc contact; the moving-side II arc contact 6 is a rod-shaped arc contact.

[0053] Specifically, at least two observation windows 8 are provided at the installation position of the housing 7 corresponding to the nozzle 9 for data acquisition of the measuring device.

[0054] The nozzle 9 of the present invention is made of a transparent material and fixed on the cylinder 12. Adopting a fixed nozzle design, the moving component on the active side where the nozzle is installed is independent of the nozzle, so that the nozzle is stationary relative to the circuit breaker housing during opening and closing, providing a stable shooting platform for the arc parameter measuring device; an auxiliary contact is added at the rear end of the self-actuating arc contact inside the arc extinguishing chamber of the test circuit breaker to stabilize the root of the arc at the end of the self-actuating arc contact at the auxiliary contact during the opening process, which is beneficial to the shooting of the arc shape.

[0055] An experimental device for measuring the arc parameters between the contacts of a gas circuit breaker provided by the present invention, when in use, as Figure 5 shown, when conducting an arc-related parameter measurement test, first, the opening and closing speeds and the moving stroke of the moving-side II arc contact in the opening test can be set for the moving-side II operating mechanism through the secondary control circuit, and the relative moving speed of the piston during opening and closing in the opening test can be set for the moving-side I operating mechanism through the secondary control circuit. Furthermore, the volume change speed of the compressed gas during the opening and closing tests can be calculated based on the cross-sectional area of the piston.

[0056] When conducting an opening test, after receiving the action signal sent by the laboratory control console, action signals are respectively sent to the moving-side I and moving-side II operating mechanisms by the secondary control circuit, so that the gas state between the contacts of the arc extinguishing chamber under different opening and closing speeds and different gas-blowing conditions can be simulated.

[0057] When conducting an opening test, after receiving the action signal sent by the laboratory control console, the secondary control circuit sends a signal to the measuring device, and the measuring device records or shoots the test data at the contact by the observation window according to the measurement or shooting time preset by the software before the test. Subsequently, the signal can be further processed as needed.

[0058] In summary, an experimental device for measuring arc parameters between the contacts of a gas circuit breaker provided by the present invention is composed of a bilateral independent operating mechanism and a test circuit breaker. Among them, the bilateral independent mechanism is used to drive the arcing contacts and the piston of the pressure cylinder to move respectively, so as to adjust the relative movement speed of the closing and opening contacts, the gas blowing speed and flow rate between the contacts during opening respectively, and simulate the arc extinguishing state of the contacts in the arc extinguishing chamber under different speeds and gas blowing conditions, reduce the number of test prototypes and spare parts, and effectively shorten the test time and improve the test efficiency. Secondly, the nozzle of the actual product and the self-acting arcing contact connected thereto and serving as the moving arcing contact are fixedly designed in the present application, so that they are independent of the original connected moving piston. The nozzle and the self-acting arcing contact connected thereto are set as static contacts. During the closing and opening process, the nozzle and the arcing contact connected thereto are stationary relative to the circuit breaker housing. At the same time, the rod-shaped arcing contact serving as the static arcing contact in the actual product is set as the moving contact. After the above settings of the nozzle and the arcing contact are made, the nozzle is stationary relative to the housing during the entire opening process, which helps the photographing device to collect the change form of the arc in the nozzle. In addition, an auxiliary contact is added at the rear end of the self-acting arcing contact in the present application to stabilize the root of the arc at the static side contact end during the opening process at the auxiliary contact, which is beneficial to the photographing of the arc form.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement without departing from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. An experimental device for measuring the arc parameters between the contacts of a gas circuit breaker, characterized in that It includes a moving-side II operating mechanism (1), a test circuit breaker, and a moving-side I operating mechanism (18); the test circuit breaker includes a circuit breaker body and a control device (19), the control device (19) is electrically connected to the circuit breaker body and is used to control the circuit breaker body, the circuit breaker body includes a housing (7), and an arc extinguishing chamber provided within the housing (7); the arc extinguishing chamber includes a moving-side I arc contact assembly and a moving-side II arc contact assembly connected coaxially; The moving-side I arc contact assembly includes a moving-side I support assembly, a moving-side I pull rod assembly, a cylinder (12), a piston (13), an auxiliary contact (11), a moving-side I arc contact (10), and a nozzle (9); one end of the moving-side I support assembly is fixed within the housing (7), and the other end is connected to the cylinder (12), one end of the cylinder (12) is equipped with the nozzle (9), one end of the moving-side I pull rod assembly passes through the moving-side I support assembly and extends into the cylinder (12), the piston (13) is connected to the end of the moving-side I pull rod assembly within the cylinder (12), the other end of the moving-side I pull rod assembly extends out of the housing (7) along the moving-side I support assembly and is connected to the moving-side I operating mechanism (18); a contact mounting seat is provided within the cylinder (12), the contact mounting seat is located between the piston (13) and the inner end face of the nozzle (9), the moving-side I arc contact (10) is assembled on the contact mounting seat and is located within the nozzle (9), the auxiliary contact (11) is arranged within the moving-side I arc contact (10), and the mounting end is assembled on the contact mounting seat; The moving-side II arc contact assembly includes a moving-side II support assembly, a moving-side II pull rod assembly, and a moving-side II arc contact (6); one end of the moving-side II support assembly is fixed within the housing (7), the moving-side II arc contact (6) is assembled at one end of the moving-side II pull rod assembly, and along the moving-side II support assembly, it extends into the nozzle (9) to contact the moving-side I arc contact (10), the other end of the moving-side II pull rod assembly extends out of the housing (7) along the moving-side II support assembly and is connected to the moving-side II operating mechanism (1); The control device (19) drives the moving-side II operating mechanism (1) and the moving-side I operating mechanism (18) respectively, and by controlling the timing and speed of the operation switch for opening and closing, it realizes the simulation of different opening and closing speeds and air-blowing conditions during the opening and closing of the circuit breaker; A structure of the auxiliary contact (11) includes a limit rod (111), a sleeve (112), an installation slider (113), an auxiliary contact head (114), and a spring (115). The sleeve (112) is assembled in the moving-side I arc contact head (10) and fastened to the moving-side I arc contact head (10) by threads. The installation slider (113) and the auxiliary contact head (114) are assembled in the sleeve (112). One end of the limit rod (111) extends into the sleeve (112) and is fixedly connected to the installation slider (113) by threads. The other end of the installation slider (113) is connected to the auxiliary contact head (114). When the circuit breaker is closed, the auxiliary contact head (114) contacts the moving-side II arc contact head. The limit rod (111) is sleeved with a spring (115) in the sleeve (112). Another structure of the auxiliary contact (11) includes a limit rod (111), a sleeve (112), an installation slider (113), an auxiliary contact head (114), a spring (115), a spring fixing column (116), and a spring fixing cover (117). The sleeve (112) is assembled in the moving-side I arc contact head (10) and fastened to the moving-side I arc contact head (10) by threads. One end of the spring fixing cover (117) is assembled on the sleeve (112), and the other end is connected to the contact installation seat. The spring fixing column (116) is inside the spring fixing cover (117), with one end fixed on the inner wall of the spring fixing cover (117) and the other end connected to the sleeve (112). The limit rod (111) is slidably arranged in the spring fixing column (116). The spring (115) is sleeved on the spring fixing column (116). The other end of the limit rod (111) is connected to the installation slider (113) by threads. The auxiliary contact head (114) is assembled at the other end of the installation slider (113). When the circuit breaker is closed, the auxiliary contact head (114) contacts the moving-side II arc contact head.

2. The experimental device for measuring the arc parameters between the breaking ports of a gas circuit breaker according to claim 1, characterized in that, The diameter of the auxiliary contact head (114) is smaller than that of the moving-side I arc contact head (10), and when the circuit breaker is in the open state, the auxiliary contact head (114) protrudes at least 0.5 mm from the surface of the moving-side I arc contact head (10) inside the moving-side I arc contact head (10).

3. The experimental device for measuring the arc parameters between the contacts of a gas circuit breaker according to claim 1, characterized in that, The moving-side II support assembly includes a moving-side II insulating support (3) and a moving-side II support base (5). One end of the moving-side II insulating support (3) is assembled on the housing (7), and the other end is connected to the moving-side II support base (5). The moving-side II arc contact (6) extends into the nozzle (9) through the moving-side II insulating support (3) and the moving-side II support base (5) in sequence on the moving-side II pull rod assembly to contact the moving-side I arc contact (10). The other end of the moving-side II pull rod assembly extends out of the housing and is connected to the moving-side II operating mechanism (1). Among them, the moving-side II pull rod assembly includes a moving-side II insulating pull rod (2) and a moving-side II steel pull rod (4). One end of the moving-side II insulating pull rod (2) extends out of the housing (7) in the moving-side II insulating support (3) and is connected to the moving-side II operating mechanism (1), and the other end extends into the moving-side II support base (5) and is connected to the moving-side II steel pull rod (4). The moving-side II arc contact (6) is assembled on the moving-side II steel pull rod (4) and extends into the nozzle (9) through the moving-side II steel pull rod (4) to contact the moving-side I arc contact (10).

4. The experimental device for measuring the arc parameters between the contacts of a gas circuit breaker according to claim 1, characterized in that, The moving-side I support assembly includes a moving-side I support base (15) and a moving-side I insulating support (16). One end of the moving-side I insulating support (16) is assembled on the housing (7), and the other end is connected to the moving-side I support base (15). The other end of the moving-side I support base (15) is connected to the cylinder (12). One end of the moving-side I pull rod assembly passes through the moving-side I insulating support (16) and the moving-side I support base (15) in sequence and extends into the cylinder (12) to be connected to the piston (13), and the other end extends out of the housing (7) and is connected to the moving-side I operating mechanism (18). Among them, the moving-side I pull rod assembly includes a moving-side I steel pull rod (14) and a moving-side I insulating pull rod (17). One end of the moving-side I insulating pull rod (17) extends out of the housing (7) in the moving-side I insulating support (16) and is connected to the moving-side I operating mechanism (18), and the other end is connected to the moving-side I steel pull rod (14). The moving-side I steel pull rod (14) extends into the cylinder (12) in the moving-side I support base (15) and is connected to the piston (13).

5. An experimental device for measuring the arc parameters between the contacts of a gas circuit breaker according to claim 1, characterized in that, The control device (19) includes a secondary control circuit unit and a controller. The input end of the controller is connected to a signal input module, and the signal input module is connected to the secondary control circuit unit for inputting an operation command to the controller. The output end of the controller is connected to a drive module, and the drive module is respectively assembled on the moving-side I operating mechanism (18) and the moving-side II operating mechanism (1) for controlling the opening and closing actions of the circuit breaker.

6. An experimental device for measuring the arc parameters between the contacts of a gas circuit breaker according to claim 5, characterized in that The moving-side I arc contact (10) is a self-acting arc contact; the moving-side II arc contact (6) is a rod-shaped arc contact.

7. An experimental device for measuring arc parameters between the contacts of a gas circuit breaker according to claim 1, characterized in that, At least two observation windows (8) are provided at the installation position of the housing (7) corresponding to the nozzle (9) for data acquisition of the measuring device.

8. An experimental device for measuring arc parameters between the breaking ports of a gas circuit breaker according to claim 1, characterized in that, The nozzle (9) is made of a transparent material and is fixed on the cylinder (12).

Images