Portable isolating switch contact finger clamping force tester

Abstract

The utility model discloses a portable isolating switch contact finger clamping force tester, which relates to the field of electric power system application equipment and comprises a handle, a control device and a detection device, the handle is sequentially connected with the control device and the detection device, the control device is externally provided with a display screen and keys and internally provided with two control circuit boards and a lithium battery, and the control circuit boards and the lithium battery are connected with the control device. The detection device is formed by combining an upper touch panel and a lower touch panel, pressure sensors are arranged in two external grooves of the upper touch panel respectively, an auxiliary touch panel is arranged at the tail end of the detection module, the distance between the two touch panels of the disconnecting switch is adapted by adjusting the thickness of the auxiliary touch panel, and the control device is provided with an interface communicating with an upper computer. And a plurality of peripheral interfaces are configured to be connected with a plurality of communication devices and other external devices. The device is simple in structure, small in size, light in weight, wide in measurement range, long in endurance time, flexible and convenient to operate, and strong in universality, and supports clamping force measurement of contacts with various widths.

Description

Technical Field

[0001] The utility model relates to the field of power system application equipment, in particular to a portable isolating switch contact finger clamping force tester. Background Art

[0002] The HGW9-12(W) outdoor single-pole disconnector is suitable for use on 12kV high-voltage transmission and distribution lines, disconnecting and closing single-phase or three-phase circuits with no-load voltage. Designed for single-phase operation in three-phase systems, the switch features a simple, economical, and user-friendly design. It can also be used to adjust the system's operating mode, adapting to busbar current conversion and low-current requirements within the specified ranges for voltage transformers, lightning arresters, and other devices. The HGW9-12(W) disconnector consists of a base, insulators, and conductive parts. It utilizes a knife-type switching mechanism for opening and closing. Each phase consists of a pair of conductive blades, flanked by compression springs. The required contact pressure is achieved by adjusting the spring compression. The switch is operated by pulling or pushing the self-locking mechanism with an insulated hook.

[0003] During continuous power transmission, uneven pressure distribution causes uneven current distribution across each contact finger. The greater the pressure difference, the more severe the uneven current distribution. Over time, this uneven current distribution can lead to poor contact, which in turn causes equipment overheating. During routine maintenance, technicians often rely solely on measuring loop resistance to determine the contact condition of the disconnector's conductive components, assuming that as long as the resistance value is within the acceptable range, the repair is complete. When inspecting the clamping force of disconnector contacts, they often only focus on replacing springs that are clearly failing or broken, while failing to assess springs with reduced force on-site. Some disconnectors feature adjustable contact pressure during installation or maintenance (such as clamp-type disconnectors). Without appropriate monitoring methods, effective adjustment of the disconnector's clamping force is impossible. Insufficient clamping force can lead to severe heating and partial melting of the contacts. Some disconnectors can even fail to withstand the electrodynamic forces of the short-circuit current, pushing the contacts apart and generating arcs that can burn them out, posing a significant safety hazard.

[0004] The clamping force test devices currently available in factories on the market are often large and heavy, making them difficult for on-site operators to carry. They are extremely inconvenient to use in actual narrow or high-altitude working environments. They rely on an AC220V power supply, which greatly restricts their use scenarios. Since they need to be connected to a power source, the position of the tester itself is also restricted, further reducing its flexibility. Secondly, the distance between the operating handle and the control end is usually far, making single-person operation difficult. Furthermore, the measuring dimensions of this test device are relatively short, making it impossible to test various models of products. This limitation makes them incompetent in certain scenarios that require a wider measurement range, thereby reducing their versatility and applicability. In summary, the existing factory clamping force test devices on the market have obvious deficiencies in terms of size, weight, power dependence, ease of operation and measurement range, and are in urgent need of optimization and improvement. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, the utility model provides a portable isolating switch contact finger clamping force tester with simple structure, small size, light weight, supports clamping force measurement of contacts of various widths, has a wide measurement range, long battery life, flexible and convenient operation, and strong versatility.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present utility model is:

[0007] A portable isolating switch contact finger clamping force tester includes a handle, a control device and a detection device. The handle is connected to the control device and the detection device in sequence. The control device has an external display screen and buttons, and two built-in control circuit boards and a lithium battery. The detection device is composed of an upper touch panel and a lower touch panel. Pressure sensors are respectively arranged in the two external grooves of the upper touch panel. An auxiliary touch panel is arranged at the end of the detection module. The distance between the two touch panels of the isolating switch is adapted by adjusting the thickness of the auxiliary touch panel. The control device is provided with an interface for communicating with a host computer, and is equipped with multiple peripheral interfaces for connection with various communication devices and other external devices to realize the display of the isolating switch clamping force, ABC phases, battery power and charging status information. Internal parameter setting, data storage, reset and clearing operations are realized through button operation and mobile phone applet operation.

[0008] The handle is adjustable in length and is fixedly connected to the housing of the control device.

[0009] The upper shell of the control device and the upper touch panel of the detection device are set as an integrated structure, a separate rear cover is set at the rear of the control device, and the rear of the upper touch panel of the detection device is fixedly connected to the lower touch panel.

[0010] Two grooves are arranged on the outer wall of the lower touch plate at intervals, and the pressure sensors are respectively arranged in the two grooves. Positioning blocks are also provided in the two grooves, and the positioning blocks have built-in holes. Holes are also provided at corresponding positions on the upper touch plate, and the upper touch plate and the lower touch plate are fixedly connected by bolts passing through the two corresponding holes.

[0011] The auxiliary touch panel is configured as an inverted concave plate structure that is sleeved on the end of the detection device. Its inner side wall tightly fits the outer walls of the upper touch panel and the lower touch panel of the detection device, and is fixedly connected to the detection device through prefabricated holes and bolts.

[0012] The pressure sensor adopts a piezoresistive strain bridge.

[0013] The lithium battery of the control device is arranged between two control circuit boards. The upper control circuit board is the display operation board, and the lower control circuit board is the main control circuit board. The lithium battery is a 3.7V rechargeable lithium battery.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1) The tester consists of a handle, a control device and a detection device, with a compact structure, small size and light weight. The front shell of the control device and the detection device are an integrated structure with a firm connection. The handle is connected to the control device and the length is adjustable, which makes the operation flexible and convenient.

[0016] 2) The control device of the tester has a built-in control circuit board and rechargeable lithium battery, an external display screen and buttons, which can support the connection of various communication devices and external devices, and connect to the host computer. Through buttons or mobile phone app operations, it can realize the touch panel clamping force measurement, parameter setting, data storage, reset, clearing and other operations, with strong controllability and high measurement accuracy;

[0017] 3) Using rechargeable lithium batteries, no need to rely on external power supply, wide range of use and strong flexibility;

[0018] 4) The detection device is equipped with an auxiliary touch panel, which can measure the clamping force of fingers with different widths by adjusting the width of the auxiliary touch panel. It has a wide measurement range and strong versatility, making it suitable for large-scale promotion and application.

[0019] 5) It not only improves the safety and stability of the power system, but also greatly enhances the accuracy and efficiency of maintenance work, significantly reduces the maintenance cost of the power system, and safeguards the long-term stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the overall structure of the utility model;

[0021] Figure 2 A schematic diagram of the structure of the control device of the utility model;

[0022] Figure 3 Schematic diagram of the use of the utility model. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] like Figure 1-2 As shown, the portable isolating switch contact finger clamping force tester includes a handle 1, a control device 2 and a detection device 3. The handle 1 is connected to the control device 2 and the detection device 3 in sequence. The control device 2 has an external display screen 21 and a button 24, and two built-in control circuit boards 22 and a lithium battery 23. The detection device 3 is composed of an upper touch panel 31 and a lower touch panel 32. Pressure sensors 33 are respectively arranged in the two external grooves of the upper touch panel 31. An auxiliary touch panel 34 is arranged at the end of the detection module 3. The thickness of the auxiliary touch panel 34 is adjusted to adapt to the distance between the two touch panels of the isolating switch. The control device 2 is provided with an interface for communicating with the host computer, and is equipped with multiple peripheral interfaces for connection with various communication devices and other external devices to realize the display of the isolating switch clamping force, ABC phase, battery power and charging status information. Internal parameter setting, data storage, reset and clearing operations are realized through button operation and mobile phone applet operation.

[0025] As a preferred embodiment, the handle 1 is adjustable in length and fixedly connected to the housing of the control device 2. Specifically, in this embodiment, a threaded post is provided at the end of the handle 1 to connect with the threaded hole of the lower touch plate 32. The length of the handle 1 can be selected according to the actual situation.

[0026] As a preferred embodiment, in this embodiment, the upper shell of the control device 2 and the upper touch panel 31 of the detection device 3 are set as an integrated structure, a separate rear cover 25 is set at the rear of the control device 2, and the rear of the upper touch panel 31 of the detection device 3 is fixedly connected to the lower touch panel 32.

[0027] As a preferred method, in this embodiment, two grooves are arranged on the outer wall of the lower touch plate 32 at intervals, and the pressure sensors 33 are respectively arranged in the two grooves. Positioning blocks 35 are also provided in the two grooves, and the positioning blocks 35 have built-in holes. Holes are also provided at corresponding positions on the upper touch plate 31, and the upper touch plate 31 is fixedly connected to the lower touch plate 32 by bolts passing through the two corresponding holes.

[0028] As a preferred method, in this embodiment, the auxiliary touch panel 34 is configured as an inverted concave plate structure that is sleeved on the end of the detection device 3, and its inner side wall tightly fits the outer wall of the upper touch panel 31 and the lower touch panel 32 of the detection device 3, and is fixedly connected to the detection device 3 through prefabricated holes and bolts.

[0029] As a preferred embodiment, in this embodiment, the pressure sensor 33 adopts a piezoresistive strain bridge to convert pressure into a differential signal, which has high versatility.

[0030] As a preferred method, in this embodiment, the lithium battery 23 of the control device 2 is arranged between two control circuit boards 22, the upper control circuit board 22 is a display operation panel, and the lower control circuit board 22 is a main control circuit board. The lithium battery 23 is a 3.7V rechargeable lithium battery.

[0031] In this embodiment, the circuit board module of the control module has a Type-C interface, and uses the Type-C interface to communicate with the host computer PC.

[0032] The upper control circuit board 22 is equipped with a Type-C interface, a voltage stabilization circuit and a battery management circuit. The size of the OLED display screen 21 connected to the control is 1.3 inches (about 33*22mm). It communicates with the microcontroller through the I2C protocol to realize the display of information such as clamping force, ABC phases, battery power and charging status. Data saving, resetting, clearing, internal parameter setting and other related operations can be realized through button operation and app operation.

[0033] The control circuit board 22 on the lower layer is mainly composed of a main control chip, a digital-to-analog conversion chip and circuit, a Bluetooth module, and several interfaces. The main control chip uses the commonly used STM32F103C8T6 single-chip microcomputer. The STM32F103C8T6 is a microcontroller based on the ARM Cortex-M core STM32 series, with an operating voltage of 2V to 3.6V and an operating temperature of -40°C to 85°C. It is equipped with a rich peripheral interface, including multiple general-purpose timers, universal synchronous / asynchronous serial interfaces, I2C and SPI interfaces to support various communication and external device connection requirements. In this embodiment, the structural design of the control circuit board 22 ensures installation in a small space while increasing portability.

[0034] The Bluetooth module uses MX-01A, with a theoretical communication distance of 100 meters. In this embodiment, only 20 to 30 meters is required. The Bluetooth module communicates with the main control chip through the serial port to achieve transparent transmission. To match the Bluetooth module, the part of the tester with the circuit board at the tail is preferably made of plastic on both bottom surfaces.

[0035] The mobile phone APP or PAD can realize wireless communication with the tester, display and store data, automatically perform professional analysis and curve display on the data, etc., and can also add functions according to customer needs.

[0036] The following takes the clamping force test of the HGW9-12 (W) type disconnector as an example to specifically illustrate the use process of the present invention.

[0037] like Figure 3 Figure 1 shows the schematic diagram of the conductive portion of the disconnector. To open the circuit, the insulating hook rod first pulls the hook plate 41, causing the clamping plate 42 to rotate about its axis. When the clamping plate 42 reaches the limit position, the groove at the bottom of the clamping plate 42 disengages from the limit plate 43. At this point, the insulating hook rod continues to pull the hook plate 41, causing the contact blade 44 to rotate as a whole and separate from the right terminal block. To close the circuit, the insulating hook rod pushes the hook plate 41, causing the contact blade 44 to rotate. Near the closing point, the groove at the bottom of the clamping plate 42 contacts the limit plate 43. Under the driving force, the groove of the clamping plate 42 rotates along its own circular edge, passing over the limit plate 43. The reset spring 45 resets the clamping plate 42 in the opposite direction, causing the groove to enter under the limit plate 43, achieving self-locking.

[0038] The specific usage of this utility model is as follows:

[0039] First, place the HGW9-12(W) type disconnector in the open state;

[0040] Choose whether to add an auxiliary touch plate 34 at the end of the detection device 2 according to the distance between the contact blades 44 of the disconnector. Select a tester with a suitable width for the contact blades 44 to be tested. Apply a small amount of grease on both sides of the upper touch plate 31, the lower touch plate 32, or the auxiliary touch plate 34.

[0041] 1. Turn on the battery switch and check whether the displayed value is zero after the self-test is stable;

[0042] 2. Insert the tester touch panel into the isolating switch contact blade 44, making sure that the touch panels on both sides of the tester detection device 2 are perpendicular to the isolating switch contact blade 44. Insert the touch panels steadily. After inserting the touch panels, do not move them left or right or up and down to avoid affecting the accuracy of the readings and causing damage to the isolating switch contact blade 44.

[0043] 3. Wait for the value displayed on the display screen 21 to stabilize before reading;

[0044] 4. After reading, move the touch panels on both sides of the tester out smoothly, turn off the power switch, and place the clamping force tester in a ventilated and dry place for proper storage;

[0045] 5. Restore the HGW9-12(W) type isolating switch to the closed state.

[0046] Multiple tests have shown that the overall weight of this tester is ≤1.5kg, and it can support the clamping force measurement of various contact widths including 30, 40, 60, and 80mm. It has a wide range of applications and a measurement range of 0-2000N, meeting the contact clamping force measurement needs of various disconnectors. The instrument has a built-in rechargeable lithium battery with strong endurance and a sustainable battery life of more than 4 hours. It is small in size, flexible and convenient to operate, and has high measurement accuracy. By measuring the clamping force, problems with the disconnector clamping force can be discovered and addressed in a timely manner, effectively avoiding further deterioration of potential problems, reducing safety hazards of power equipment, providing good protection for the long-term stable operation of the power system, and significantly reducing the maintenance cost of the power system.

[0047] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A portable isolating switch contact finger clamping force tester, characterized in that: The invention comprises a handle (1), a control device (2) and a detection device (3), wherein the handle (1) is connected to the control device (2) and the detection device (3) in sequence, wherein the control device (2), an external display screen (21), two built-in control circuit boards (22) and a lithium battery (23), and a key (24), wherein the detection device (3) is composed of an upper touch panel (31) and a lower touch panel (32), wherein pressure sensors (33) are respectively arranged in two external grooves of the upper touch panel (31), and an auxiliary touch panel (34) is arranged at the end of the detection device (3), and the distance between the two touch panels of the isolating switch is adapted by adjusting the thickness of the auxiliary touch panel (34), wherein the control device (2) is provided with an interface for communicating with a host computer, and is configured with multiple peripheral interfaces for connecting with various communication devices and other external devices, so as to realize the display of the clamping force, ABC phases, battery power and charging status information of the isolating switch, and realize the internal parameter setting, data saving, resetting and clearing operations through key operation and mobile phone applet operation.

2. A portable isolating switch contact finger clamping force tester according to claim 1, characterized in that: The handle (1) is adjustable in length and is fixedly connected to the housing of the control device (2).

3. A portable isolating switch contact finger clamping force tester according to claim 1, characterized in that: A separate rear cover (25) is provided at the rear of the control device (2), the upper shell of the control device (2) and the upper touch panel (31) of the detection device (3) are provided as an integrated structure, and the rear of the upper touch panel (31) of the detection device (3) is fixedly connected to the lower touch panel (32).

4. A portable isolating switch contact finger clamping force tester according to claim 1, characterized in that: Two grooves are arranged on the outer wall of the lower touch plate (32) at intervals, and the pressure sensors (33) are respectively arranged in the two grooves. Positioning blocks (35) are also arranged in the two grooves, and the positioning blocks (35) have holes therein. The upper touch plate (31) is also provided with holes at corresponding positions, and the upper touch plate (31) is fixedly connected to the lower touch plate (32) by passing bolts through the two corresponding holes.

5. The portable isolating switch contact finger clamping force tester according to claim 1, characterized in that: The auxiliary touch plate (34) is configured as an inverted concave plate-like structure sleeved on the end of the detection device (3), with its inner side wall tightly fitting the outer walls of the upper touch plate (31) and the lower touch plate (32) of the detection device (3), and is fixedly connected to the detection device (3) through prefabricated holes and bolts.

6. A portable isolating switch contact finger clamping force tester according to claim 1, characterized in that: The pressure sensor (33) adopts a piezoresistive strain bridge.

7. A portable isolating switch contact finger clamping force tester according to claim 1, characterized in that: The lithium battery (23) of the control device (2) is arranged between two control circuit boards (22), the upper control circuit board (22) is a display operation board, and the lower control circuit board (22) is a main control circuit board. The lithium battery (23) is a 3.7V rechargeable lithium battery.

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