A load resistance measuring device for a live high-voltage switchgear

Abstract

This application discloses a load resistance measuring device for a live high-voltage switchgear, including a trolley body and a contact arm assembly, a control assembly, and a resistance tester mounted on the trolley body. The first end of the contact arm assembly is electrically connected to the input terminal of the control assembly, and the output terminal of the control assembly is electrically connected to the input terminal of the resistance tester. The bottom of the trolley body moves along the guide rail of the high-voltage switchgear. When the trolley body is moved into the high-voltage switchgear, the second end of the contact arm assembly is electrically connected to the connection terminal of the load to be measured inside the high-voltage switchgear. This application achieves contact between the contact arm assembly and the connection terminal of the load to be measured through the trolley structure, ensuring a safe distance between the control assembly and the connection terminal of the load to be measured, and ensuring valid measurement results. Furthermore, it eliminates the need to disassemble the mechanical structure, achieving safe, efficient, and non-disassembly-based measurement of the load inside the high-voltage switchgear.

Description

Technical Field

[0001] This utility model belongs to the field of high-voltage switchgear operation and maintenance technology, specifically relating to a load resistance measuring device for live high-voltage switchgear. Background Technology

[0002] High-voltage switchgear, as the core control and protection equipment in high-voltage power systems, is widely used in critical power facilities such as factory power distribution, urban power grids, and substations. It integrates key components such as circuit breakers, disconnectors, relay protection devices, and measuring instruments into a closed or semi-closed metal cabinet, enabling centralized control, protection, and monitoring of high-voltage circuits. Because the components in high-voltage switchgear operate at high voltages and currents, any fault (such as a short circuit, failure to operate, or poor contact) can easily lead to widespread power outages, equipment damage, and even serious safety accidents such as fires and explosions. Therefore, regular maintenance and testing of high-voltage switchgear, especially load performance testing, is a crucial means of ensuring the safe and stable operation of the power system.

[0003] In the operation and maintenance of high-voltage switchgear, load resistance measurement is a key indicator for judging the load connection status and contact performance. Currently, conventional load resistance testing is usually performed on the high-voltage switchgear itself, mainly in two ways: front and rear. Front-of-cabinet measurement is performed through test points at the front of the cabinet, which is relatively convenient in terms of operating space, but there is a higher risk of electric shock due to its proximity to the live busbar. Rear-of-cabinet measurement requires entering the cable compartment and performing the measurement at the load terminals. The measurement results are more accurate and the measurement is further away from the high-voltage busbar, resulting in higher safety. However, rear-of-cabinet measurement requires opening the cable compartment at the rear of the cabinet, which is a more cumbersome operation and requires disassembling the mechanical interlock mechanism between the door lock and the grounding switch.

[0004] Therefore, there is an urgent need for a safe, efficient, and non-disassembly-free solution for measuring the load resistance of high-voltage switchgear. Utility Model Content

[0005] In view of this, the present invention provides a load resistance measuring device for live high-voltage switchgear, the main purpose of which is to solve the problem that the current load resistance measuring devices for live high-voltage switchgear cannot achieve safe, efficient and non-disassembly load measurement.

[0006] To address the aforementioned problems, this application provides a load resistance measuring device for a live high-voltage switchgear, comprising a trolley body, a contact arm assembly, a control assembly, and a resistance tester. The contact arm assembly, the control assembly, and the resistance tester are all mounted on the trolley body.

[0007] The first end of the contact arm assembly is electrically connected to the input end of the control assembly, and the output end of the control assembly is electrically connected to the input end of the resistance tester.

[0008] The bottom of the trolley body moves along the guide rail of the high-voltage switchgear. When the trolley body is moved into the high-voltage switchgear, the second end of the contact arm assembly is electrically connected to the connection end of the load to be measured in the high-voltage switchgear.

[0009] In one embodiment of this utility model, optionally, the contact arm assembly includes a first contact, a second contact, a third contact, a first contact arm, a second contact arm, and a third contact arm, wherein,

[0010] The first contact arm has a first contact at its first end and a second contact at its second end, which is electrically connected to the first input terminal of the control component; the second contact arm has a second contact at its first end and a second contact at its second end, which is electrically connected to the second input terminal of the control component; the third contact arm has a third contact at its first end and a second contact at its second end, which is electrically connected to the third input terminal of the control component.

[0011] When the trolley body is moved into the high-voltage switch cabinet, the first contact, the second contact, and the third contact are electrically connected to the three-phase voltage connection terminals of the load to be measured, one by one.

[0012] In one embodiment of this utility model, optionally, the control component includes a housing and a panel disposed on the housing. The housing is provided with a first connection point, a second connection point, a third connection point, a first output terminal, and a second output terminal. The second end of the first contact arm is disposed on the first connection point, the second end of the second contact arm is disposed on the second connection point, and the second end of the third contact arm is disposed on the third connection point. The first output terminal and the second output terminal are respectively electrically connected to the input terminal of the resistance tester.

[0013] In one embodiment of this utility model, optionally, the panel is provided with a first switch, a second switch and a third switch, wherein a first end of the first switch is electrically connected to the first output terminal, a second end of the first switch is electrically connected to the first connection point, a third end of the first switch is electrically connected to the second connection point, and a fourth end of the first switch is electrically connected to the second output terminal.

[0014] The first end of the second switch is electrically connected to the first output end, the second end of the second switch is electrically connected to the second connection point, the third end of the second switch is electrically connected to the third connection point, and the fourth end of the second switch is electrically connected to the second output end.

[0015] The first end of the third switch is electrically connected to the first output end, the second end of the third switch is electrically connected to the third connection point, the third end of the third switch is electrically connected to the first connection point, and the fourth end of the third switch is electrically connected to the second output end.

[0016] In one embodiment of this utility model, optionally, the handcart body includes a chassis and a bracket mounted on the chassis. The bracket is provided with a push handle, and the bottom of the chassis is provided with rollers that move along the guide rails of the high-voltage switchgear.

[0017] In one embodiment of this utility model, optionally, the bracket is provided with the housing and the insulation test chamber, and the insulation test chamber is provided with the resistance tester.

[0018] In one embodiment of this utility model, optionally, the bracket is provided with a plurality of positioning holes in the vertical direction, and the side of the box is provided with a retractable pin, the head of the retractable pin matching the positioning hole.

[0019] Optionally, in one embodiment of this utility model, the insulation test chamber is provided with a first test point and a second test point. The first end of the first test point is electrically connected to the first output terminal, the second end of the first test point is electrically connected to the first input terminal of the resistance tester, the first end of the second test point is electrically connected to the second output terminal, and the second end of the second test point is electrically connected to the second input terminal of the resistance tester.

[0020] The beneficial effects of this application are as follows: The load resistance measuring device for a live high-voltage switchgear provided by this utility model adopts a handcart structure. The handcart body is equipped with a control component and a contact arm component. When the handcart body is moved into the high-voltage switchgear, the contact arm component contacts the connection end of the load to be measured and transmits the signal to the control component. The control component then transmits the signal to the resistance tester, which measures the load inside the high-voltage switchgear. Since the connection between the connection end of the load to be measured and the control component is realized through the contact arm component, the distance between the control component and the contact end of the load to be measured is safe, and the measurement result is valid. At the same time, it does not require disassembly of the mechanical structure, thus achieving safe, efficient, and non-disassembly measurement of the load inside the high-voltage switchgear.

[0021] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 A schematic diagram of the load resistance measuring device for a live high-voltage switchgear, which is an exemplary embodiment of this utility model;

[0024] Figure 2 Another structural connection diagram of the load resistance measuring device for a live high-voltage switchgear, which is an exemplary embodiment of this utility model;

[0025] Figure 3 A structural connection diagram of the control component of the load resistance measuring device for a live high-voltage switchgear, which is an exemplary embodiment of this utility model;

[0026] Figure 4 A schematic diagram of the panel of a load resistance measuring device for a live high-voltage switchgear, which is an exemplary embodiment of the present invention;

[0027] Figures 1-4 In the diagram, 1-cart body; 2-contact arm assembly; 3-control assembly; 4-resistance tester; 5-insulation test chamber; 51-first test point; 21-first contact; 22-first contact arm; 31-box; 32-panel; SB1-first switch; SB2-second switch; SB3-third switch; L-first output terminal; N-second output terminal; A-first connection point; B-second connection point; C-third connection point. Detailed Implementation

[0028] To overcome the deficiencies in the prior art, this utility model provides a load resistance measuring device for energized high-voltage switchgear. To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the preferred embodiments of this utility model will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this utility model. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. The embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] This application provides a load resistance measuring device for a live high-voltage switchgear, see [link to relevant documentation]. Figure 1 It includes a handcart body 1, a contact arm assembly 2, a control assembly 3, and a resistance tester 4. The contact arm assembly 2, control assembly 3, and resistance tester 4 are all mounted on the handcart body 1.

[0030] The first end of the contact arm assembly 2 is electrically connected to the input end of the control assembly 3, and the output end of the control assembly 3 is electrically connected to the input end of the resistance tester 4.

[0031] The bottom of the trolley body 1 moves along the guide rail of the high-voltage switchgear. When the trolley body 1 is moved into the high-voltage switchgear, the second end of the contact arm assembly 2 is electrically connected to the connection end of the load to be measured inside the high-voltage switchgear.

[0032] Specifically, the load resistance measuring device for the live high-voltage switchgear adopts a handcart-type structure, which is matched with the high-voltage switchgear handcart compartment. The bottom of the handcart body is equipped with rollers that move along the guide rails of the high-voltage switchgear. The contact arm assembly has three sets of contact arms. When the handcart is moved into the high-voltage switchgear, the second ends of the three contact arms connect one-to-one with the contact terminals of phases A, B, and C of the load to be measured. The first ends of the three contact arms connect to the input terminal of the control component, and the output terminal of the control component connects to the input terminal of the resistance tester. When the control component outputs a control signal, such as an AB phase control signal, the load connection terminal between phases A and B connects to the AB phase test circuit in the control component. The AB phase test circuit in the control component transmits the signal to the resistance tester, which measures the resistance value between phases A and B. This measurement does not require proximity to the high-voltage busbar, ensuring the safety of the testing personnel, and can be quickly completed by one person at the high-voltage switchgear location.

[0033] Compared with the prior art, the load resistance measuring device for live high-voltage switchgear provided by this utility model adopts a handcart structure. The handcart body is equipped with a control component and a contact arm component. When the handcart body is moved into the high-voltage switchgear, the contact arm component contacts the connection end of the load to be measured and transmits the signal to the control component. The control component then transmits the signal to the resistance tester. The resistance tester measures the load in the high-voltage switchgear. Since the connection between the connection end of the load to be measured and the control component is realized through the contact arm component, the distance between the control component and the contact end of the load to be measured is safe and the measurement result is valid. At the same time, it does not require disassembly of the mechanical structure, thus realizing safe, efficient and non-disassembly measurement of the load in the high-voltage switchgear.

[0034] In one embodiment of this utility model, see Figure 2 The contact arm assembly 2 includes a first contact 21, a second contact, a third contact, a first contact arm 22, a second contact arm, and a third contact arm, wherein...

[0035] The first contact arm 22 has a first contact 21 at its first end, and the second end of the first contact arm 22 is electrically connected to the first input terminal of the control component 3; the second contact arm has a second contact at its first end, and the second end of the second contact arm is electrically connected to the second input terminal of the control component 3; the third contact arm has a third contact at its first end, and the second end of the third contact arm is electrically connected to the third input terminal of the control component 3.

[0036] When the trolley body 1 is moved into the high-voltage switch cabinet, the first contact 21, the second contact and the third contact are electrically connected to the three-phase voltage connection terminals of the load to be measured one by one.

[0037] In this embodiment, since the load to be measured includes phases A, B, and C, the contact arm assembly needs to be configured with three sets of components, each set connected to one phase of the load to be measured. The first contact arm and the first contact are configured as one set of components. The first contact is located at the first end of the first contact arm. When the trolley body is moved into the high-voltage switchgear, the first contact is connected to one phase of the load to be measured, and the second end of the first contact arm is connected to the control component to transmit the signal to the control component.

[0038] The second contact arm and the second contact are a set of components. The second contact is located at the first end of the second contact arm. When the trolley body is moved into the high-voltage switchgear, the second contact connects to one phase contact end of the load to be measured. The second end of the second contact arm connects to the control component, transmitting the signal to the control component. The third contact arm and the third contact are a set of components. The third contact is located at the first end of the third contact arm. When the trolley body is moved into the high-voltage switchgear, the third contact connects to one phase contact end of the load to be measured. The second end of the third contact arm connects to the control component, transmitting the signal to the control component. The first, second, and third contact arms ensure a safe and effective distance between the control component and the load to be measured.

[0039] In one embodiment of this utility model, see Figure 2 and Figure 3 The control component 3 includes a housing 31 and a panel 32 disposed on the housing 31. The housing 31 is provided with a first connection point A, a second connection point B, a third connection point C, a first output terminal L, and a second output terminal N. The second end of the first contact arm 22 is disposed on the first connection point A, the second end of the second contact arm is disposed on the second connection point B, and the second end of the third contact arm is disposed on the third connection point C. The first output terminal L and the second output terminal N are electrically connected to the input terminal of the resistance tester 4, respectively.

[0040] In this embodiment, the housing is provided with three connection points, and the second end of each of the three contact arms is connected to one of the connection points. The connection point serves as the input end of the control component, receiving the signal transmitted by the contact arm and transmitting the signal to other control component elements connected to the connection point.

[0041] In one embodiment of this utility model, see Figure 3 The panel is equipped with a first switch SB1, a second switch SB2 and a third switch SB3. The first end of the first switch SB1 is electrically connected to the first output terminal L, the second end of the first switch SB1 is electrically connected to the first connection point A, the third end of the first switch SB1 is electrically connected to the second connection point B, and the fourth end of the first switch SB1 is electrically connected to the second output terminal N.

[0042] The first terminal of the second switch SB2 is electrically connected to the first output terminal L, the second terminal of the second switch SB2 is electrically connected to the second connection point B, the third terminal of the second switch SB2 is electrically connected to the third connection point C, and the fourth terminal of the second switch SB2 is electrically connected to the second output terminal N.

[0043] The first terminal of the third switch SB3 is electrically connected to the first output terminal L, the second terminal of the third switch SB3 is electrically connected to the third connection point C, the third terminal of the third switch SB3 is electrically connected to the first connection point A, and the fourth terminal of the third switch SB3 is electrically connected to the second output terminal N.

[0044] In this embodiment, the first, second, and third switches are all double normally open contact buttons. When pressed, both contacts close, and when released, they reset. Pressing the first switch connects the first output terminal to the first connection point and the second output terminal to the second connection point. If the first connection point is connected to the contact arm connected to phase A and the second connection point is connected to the contact arm connected to phase B, the resistance between phases A and B can be measured. Pressing the second switch connects the first output terminal to the second connection point and the second output terminal to the third connection point. If the second connection point is connected to the contact arm connected to phase B and the third connection point is connected to the contact arm connected to phase C, the resistance between phases B and C can be measured. Pressing the third switch connects the first output terminal to the third connection point and the second output terminal to the first connection point. If the first connection point is connected to the contact arm connected to phase A and the third connection point is connected to the contact arm connected to phase C, the resistance between phases C and D can be measured.

[0045] In one embodiment, the panel is equipped with a nameplate, such as... Figure 4 As shown, the first switch SB1 measures the resistance between phases AB, the second switch SB2 measures the resistance between phases BC, and the third switch SB3 measures the resistance between phases CA.

[0046] In one embodiment of this utility model, the handcart body 1 includes a chassis and a bracket mounted on the chassis. The bracket is provided with a push handle, and the bottom of the chassis is provided with rollers that move along the guide rails of the high-voltage switchgear.

[0047] In this embodiment, the chassis is the basic frame of the trolley body, typically welded from high-strength steel, and has a rectangular structure. It supports the brackets above and the electrical components on the brackets, and must have sufficient load-bearing strength. The handle is fixed to the side of the bracket and is usually a U-shaped metal handle. The handle provides the operator with a "force point" to pull the trolley. When the trolley needs to be pushed into the switchgear, the operator grips the handle and pushes forward; when the trolley needs to be pushed out of the switchgear, the operator grips the handle and pulls backward. The bottom of the trolley compartment of the high-voltage switchgear has two pre-set parallel metal guide rails (the rail spacing perfectly matches the trolley roller spacing). The rollers are embedded in the grooves of the guide rails. The operator grips the handle and pushes forward or pulls backward, causing the trolley to move back and forth along the guide rails.

[0048] In one embodiment of this utility model, a box 21 and an insulation test chamber 5 are provided on the bracket, and a resistance tester 4 is provided inside the insulation test chamber 5.

[0049] In this embodiment, when measuring the resistance of high-voltage equipment, the resistance tester needs to be placed in an insulation testing chamber to eliminate external environmental interference, ensure the accuracy and stability of the measurement results, and guarantee operational safety. A portable, small-sized insulation testing chamber is used here.

[0050] In one embodiment of this utility model, the bracket is provided with multiple positioning holes along the vertical direction, and a retractable pin is provided on the side of the box, with the pin head of the retractable pin matching the positioning hole.

[0051] Specifically, the mounting holes on the bracket cooperate with the retractable pins on the housing to achieve precise fixation of the housing at different heights on the bracket. Since the contact arm is connected to the connection point of the housing, the height of the housing is set according to the height of the load connection point to be measured that the contact arm needs to contact, and the height of the contact arm is adjusted according to the height of different load connection points to be measured.

[0052] In one embodiment of this utility model, the insulation test chamber 5 is provided with a first test point 51 and a second test point. The first end of the first test point 51 is electrically connected to the first output terminal L, and the second end of the first test point 51 is electrically connected to the first input terminal of the resistance tester 4. The first end of the second test point is electrically connected to the second output terminal N, and the second end of the second test point is electrically connected to the second input terminal of the resistance tester 4.

[0053] Specifically, the first and second test points are fixed inside the insulation test chamber. The first and second test points are the intermediate hubs connecting the external terminals and the resistance tester. One end is connected to the external signal output terminal, and the other end is connected to the input terminal of the resistance tester. This avoids direct exposed connection between the tester and the external terminals, ensuring that the resistance tester can accurately collect the resistance data of the circuit (or device) under test.

[0054] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this application will be apparent to those skilled in the art.

[0055] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0056] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0057] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application.

[0058] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0059] Specific embodiments of this application are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in a variety of substantially any suitable detailed structures.

[0060] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0061] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A load resistance measuring device for a live high voltage switchgear, characterized in that include: The system comprises a handcart body, a contact arm assembly, a control assembly, and a resistance tester. The contact arm assembly, the control assembly, and the resistance tester are all mounted on the handcart body. The first end of the contact arm assembly is electrically connected to the input end of the control assembly, and the output end of the control assembly is electrically connected to the input end of the resistance tester. The bottom of the trolley body moves along the guide rail of the high-voltage switchgear. When the trolley body is moved into the high-voltage switchgear, the second end of the contact arm assembly is electrically connected to the connection end of the load to be measured in the high-voltage switchgear.

2. The load resistance measuring device of the live high voltage switchgear according to claim 1, characterized in that, The contact arm assembly includes a first contact, a second contact, a third contact, a first contact arm, a second contact arm, and a third contact arm, wherein, The first contact arm has a first contact at its first end and a second contact at its second end, which is electrically connected to the first input terminal of the control component; the second contact arm has a second contact at its first end and a second contact at its second end, which is electrically connected to the second input terminal of the control component; the third contact arm has a third contact at its first end and a second contact at its second end, which is electrically connected to the third input terminal of the control component. When the trolley body is moved into the high-voltage switch cabinet, the first contact, the second contact, and the third contact are electrically connected to the three-phase voltage connection terminals of the load to be measured, one by one.

3. The load resistance measuring device of a live high voltage switchgear according to claim 2, characterized in that, The control component includes a housing and a panel disposed on the housing. The housing is provided with a first connection point, a second connection point, a third connection point, a first output terminal, and a second output terminal. The second end of the first contact arm is disposed on the first connection point, the second end of the second contact arm is disposed on the second connection point, and the second end of the third contact arm is disposed on the third connection point. The first output terminal and the second output terminal are respectively electrically connected to the input terminal of the resistance tester.

4. The load resistance measuring device of the live high voltage switchgear according to claim 3, characterized in that, The panel is provided with a first switch, a second switch and a third switch, wherein the first end of the first switch is electrically connected to the first output terminal, the second end of the first switch is electrically connected to the first connection point, the third end of the first switch is electrically connected to the second connection point, and the fourth end of the first switch is electrically connected to the second output terminal. The first end of the second switch is electrically connected to the first output end, the second end of the second switch is electrically connected to the second connection point, the third end of the second switch is electrically connected to the third connection point, and the fourth end of the second switch is electrically connected to the second output end. The first end of the third switch is electrically connected to the first output end, the second end of the third switch is electrically connected to the third connection point, the third end of the third switch is electrically connected to the first connection point, and the fourth end of the third switch is electrically connected to the second output end.

5. The load resistance measuring device of a live high voltage switchgear according to claim 3 or 4, characterized in that, The trolley body includes a chassis and a bracket mounted on the chassis. The bracket is equipped with a push handle, and the bottom of the chassis is equipped with rollers that move along the guide rails of the high-voltage switchgear.

6. The load resistance measuring device of the live high voltage switchgear according to claim 5, characterized in that, The bracket is equipped with the housing and the insulation test chamber, and the insulation test chamber is equipped with the resistance tester.

7. The load resistance measuring device of a live high voltage switchgear according to claim 6, characterized in that, The bracket is provided with multiple positioning holes in the vertical direction, and the side of the box is provided with a retractable pin, the head of which matches the positioning hole.

8. The load resistance measuring device of the live high voltage switchgear according to claim 6, characterized in that, The insulation test chamber is provided with a first test point and a second test point. The first end of the first test point is electrically connected to the first output end, and the second end of the first test point is electrically connected to the first input end of the resistance tester. The first end of the second test point is electrically connected to the second output end, and the second end of the second test point is electrically connected to the second input end of the resistance tester.

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