Disconnecting switch heating live-line processing control system and method

Abstract

The invention discloses an isolating switch heating live-line processing control system and method. The system comprises a temperature monitoring module, a current acquisition module, a control module and a shunting module. The heating condition is judged by accurately monitoring the temperature current so as to control the shunting module to work, and shunting is realized by means of a wire clamp tightly connected with the moving contact and the static contact and a direct-connection shunting wire. The method comprises the steps of strict preparation before operation, careful assembly of the device, accurate operation, proper rod taking and careful follow-up inspection. The power supply reliability is improved, and the adverse effect of power-off maintenance is avoided; the maintenance efficiency and economic benefits are improved, the maintenance time is shortened, and the cost is reduced; the technical progress and management innovation are promoted, the technical blank is filled, and a new thought is developed. According to full verification of the embodiment, safe and stable operation of the power grid can be effectively guaranteed in various scenes, and the method is of great significance to development of the power industry.

Description

Technical Field

[0001] The present invention relates to the technical field of inspection and maintenance of high-voltage equipment in an electric power system, and in particular to a control system and method for processing power generation of heat-generating belts of an isolating switch. Background Art

[0002] As a vital and numerous primary equipment in the substation, disconnectors are undoubtedly the key hub of the power grid operation, especially in 500kV substations, which are widely distributed in core positions such as the 220kV line outlet interval, main incoming interval and busbar interval. They undertake important and indispensable tasks such as isolating power supply, flexibly adjusting the operation mode, and safely connecting and disconnecting small currents. They are the solid foundation for ensuring the normal operation of the power grid. Taking a large substation as an example, many 220kVGW17 disconnectors are like the "commanders" of the power grid, accurately controlling the flow of electricity. Once a link fails, the power distribution of the entire substation will fall into chaos, which will have a direct and serious impact on the vast number of users closely connected with it.

[0003] However, in actual operation, these disconnectors are always facing severe tests from many aspects. Long-term exposure to the complex and harsh outdoor environment, suffering from the erosion of wind, frost, rain and snow, coupled with the continuous increase in the service life of some equipment, the aging problem is becoming increasingly serious, and the frequent changes in loads and many other factors are intertwined, making it very easy for the dynamic and static contacts and the upper conductive arm soft connection to oxidize, which leads to a sharp increase in contact resistance and a significant decrease in conductivity. The heating defects caused by this are common. For example, after a period of operation, a 220kV GW17 disconnector in a certain area substation had severe ablation of the dynamic contact finger and the static contact conductive rod. After detection, its heating temperature soared to 167℃ (similar to the situation that occurred at the B-phase contact position of a 50522 disconnector in a certain city). This not only seriously interferes with the normal operation of the equipment itself, but also poses a great potential threat to the safety of surrounding equipment. If effective measures are not taken in time to deal with it, it is very likely to cause arc discharge, which will cause the line to trip and cause large-scale load loss. It is like a sudden disaster, which brings a heavy blow to the safe and stable operation of the power grid.

[0004] At present, the treatment of heat defects of disconnectors has traditionally relied on maintenance after power outages. However, this method has exposed many drawbacks that are difficult to overcome in actual operation, especially during special power supply periods, such as major holidays, important events, and peak power load periods such as peak summer and peak winter. Power outages for maintenance are often difficult to implement due to high requirements for power supply reliability. For example, during the high temperature period in summer, the total electricity consumption in society has shown a sharp increase. At this time, if the disconnector is shut down for maintenance, it will inevitably cause power outages for a large area of ​​users, which will cause serious interference to the normal production and living order of the society. Therefore, in this case, the equipment can only be helplessly in a "disease-involved" state.

[0005] In the long process of waiting for the approval of the power outage plan, although the operation and maintenance personnel can use advanced monitoring technologies such as infrared thermal imaging and ultraviolet imaging to closely track the operating status of the equipment, they cannot fundamentally alleviate the heating of the equipment due to the lack of effective active intervention measures. Just like when the B-phase contact position of the 50522 disconnector in a certain city heated up to 167°C and reported a critical defect, while waiting for the dispatcher to adjust the operating mode, the operation and maintenance personnel had no choice but to strengthen the inspection of the equipment in the interval and track the load, current and heating temperature of the relevant lines (recorded every 1 hour). However, the equipment continued to operate at high temperature. The operating risk was like a constantly accumulating "powder keg" that could explode at any time, bringing huge potential crises to the safe and stable operation of the power grid.

[0006] As modern society becomes increasingly dependent on electricity supply, the scale of the power grid continues to expand, and users' expectations for power supply reliability are becoming more and more stringent. Under this new situation, the traditional power outage maintenance method has become inadequate and difficult to meet the urgent needs of efficient operation and maintenance of modern power grids. For example, in some industrial production fields that have extremely high requirements for power supply continuity, even extremely short power outages may cause serious consequences such as damage to production equipment and interruption of production processes, thereby causing huge economic losses. Therefore, there is an urgent need for an innovative technical means to quickly and effectively handle the heating defects of the disconnector without power outages, ensure continuous and stable power supply of the power grid, effectively improve power supply reliability, reduce equipment failure rates, and reduce the many adverse effects of power outages on society.

[0007] In today's era of rapid technological development, live working, as an advanced maintenance concept and technical means, is of self-evident importance. However, the existing heat-generating hot live-working treatment technology for disconnectors still has many shortcomings, and breakthroughs and innovations are urgently needed. For example, there is a general lack of efficient, practical and widely applicable live-working treatment devices for the heating defects of 220kVGW17 disconnectors on the market. Therefore, it has become an inevitable trend in the development of the power industry to develop a new technical solution, actively expand the application scope of live working, and vigorously improve its technical level and processing capabilities. This will help promote the power system to move steadily towards a more intelligent, efficient and reliable direction, so as to better serve the vigorous development of the social economy. Summary of the invention

[0008] The technical problem to be solved by the present invention is a control system and method for processing hot-spot electricity of a disconnector. Aiming at the heating defects of a 220kV GW17 disconnector caused by oxidation at the contact between moving and static contacts and the soft connection of an upper conductive arm, a parallel shunt branch is set at the heating part, and the parallel shunt principle is utilized. A suitable wire clamp and a direct shunt line are used to shunt part of the current, thereby reducing the current value flowing through the heating part of the disconnector, and further reducing the heating temperature. The goal is to reduce the hot spot temperature to below 90°C, so as to prevent arc discharge, line tripping and load loss caused by severe heating.

[0009] In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0010] A heat-generating belt electrification processing control system for an isolating switch, comprising:

[0011] Temperature monitoring module, used to monitor the temperature of the isolating switch in real time;

[0012] A current acquisition module is used to collect the current of the isolating switch;

[0013] A control module, connected to the temperature monitoring module and the current acquisition module, for judging whether the isolating switch is heated according to the monitored temperature and the collected current, and controlling the shunt module to work when it is judged that the isolating switch is heated;

[0014] Diversion module: Based on the formula: Where R a is the original branch resistance, R b is the parallel shunt branch resistance, R eq is an equivalent resistor, connected to the control module and used to shunt the isolating switch under the control of the control module to reduce the heating temperature of the isolating switch;

[0015] Connection relationship and function realization of each part: The temperature monitoring module and the current acquisition module transmit the collected data to the control module in real time. After processing and judgment, the control module sends a control instruction to the shunt module. Under the precise control of the control module, the shunt module is tightly connected to the moving and static contacts of the isolating switch through the wire clamp. The direct shunt line shunts part of the current, thereby reducing the current density in the heating part of the isolating switch, achieving the purpose of reducing the heating temperature and ensuring the safe and stable operation of the isolating switch.

[0016] As a preferred solution of the present invention, the method for the control module to determine whether the isolating switch is heated is as follows: when the monitored temperature exceeds a preset temperature threshold or the collected current exceeds a preset current threshold, the isolating switch is judged to be heated, specifically:

[0017] Real-time monitoring of the temperature and current of the isolating switch: The temperature monitoring module and current acquisition module installed on the isolating switch are used to continuously collect temperature and current data and timely capture the changes in temperature and current;

[0018] The heating condition of the isolating switch is judged according to the monitored temperature and the collected current: when it is judged that the isolating switch is heated, the shunt module is controlled to shunt the isolating switch to reduce the heating temperature of the isolating switch; after receiving the monitoring data, the control module analyzes it according to the preset judgment logic, and if the temperature exceeds the preset temperature threshold or the current exceeds the preset current threshold, it is judged that the isolating switch is heated. At this time, the control module immediately sends a start signal to the shunt module, and the shunt module starts working, and part of the current is shunted through the wire clamp and the direct shunt line to reduce the current density of the heating part, thereby reducing the heating temperature; during the shunting process, the temperature and current changes are continuously monitored, and the shunting strategy is adjusted according to the actual situation.

[0019] Furthermore, the wire clamp part includes:

[0020] Moving contact side wire clamp: A specially designed G-type wire clamp is used, and its structure is highly adapted to the shape of the moving contact of the disconnector, based on the following formula: Among them, C is the basic ratio, A is the actual contact circumference length, and B is the total circumference length of the conductive arm; the structural design has a contact ratio of not less than 87.5% with the conductive arm circumference, and the contact circumference range angle is 0°-180°. The contact part is made of special conductive alloy material to ensure good conductivity and contact stability. The clamping force of the G-type wire clamp can be adjusted through a precisely designed threaded fastening device. It is easy and firm to install, avoiding loosening due to vibration and other reasons during operation. It is reliably connected with the moving contact to achieve efficient current conduction, thereby sharing the current at the hot point and reducing the heating temperature;

[0021] Static contact side clamp: Use E-type clamp, which is designed based on the formula Where D is the effective contact area ratio, N is the actual effective contact area between the wire clamp and the static contact, and M is the total area of ​​the static contact base; the structural characteristics of the static contact are fully considered, the form is more in line with the structure of the static contact base, the effective contact area ratio is at least 95%, and it is reliably connected to the static contact base. The E-type wire clamp is tightly connected to the static contact through a unique fastening method, so that it can withstand greater tension and pressure, ensuring a stable electrical connection with the static contact during the shunting process, effectively sharing the current to achieve the shunting of the current at the hot point, and thus achieving the purpose of reducing the temperature.

[0022] As a preferred technical solution of the present invention, the direct-connected shunt line part: the direct-connected shunt line adopts high-purity copper multi-strand conductive copper stranded wire, and the surface of each copper wire is specially plated to improve the oxidation resistance and corrosion resistance. Its cross-sectional area is precisely designed to be 200mm 2 According to the rated current and heating condition of the disconnector and the maximum load current of the main transformer 220kV side not exceeding 1200A, the cross-sectional area is determined by calculation. The calculation formula is as follows:

[0023]

[0024] It not only effectively shares the current, but also ensures that the temperature rise of the shunt line itself is within a safe range, ensuring that the shunt effect is significant, stable and reliable.

[0025] Furthermore, the G-type wire clamp and the E-type wire clamp are both made of aluminum alloy, which reduces the overall weight of the wire clamp, facilitates installation and operation, and is particularly suitable for complex environments such as high-altitude operations.

[0026] As a preferred solution of the present invention, it also includes an insulating rod for installing the wire clamp and the direct-connected shunt line. The insulating rod is made of glass fiber reinforced plastic epoxy resin, has a length of 5.6m, and a withstand voltage rating of 220kV.

[0027] Furthermore, the fastening method of connecting the various parts is specifically as follows:

[0028] Threaded fastening: used for wire clamps, the relationship between torque and friction clamping force is 90% torque is used to overcome friction, 10% torque is used to generate clamping force, so that the wire clamp is firmly connected to the corresponding part of the disconnector, providing a reliable connection point for the direct-connected shunt line; during the operation of the disconnector, the stable connection ensures that the shunt line can effectively share the current of the hot point, thereby reducing the heating temperature, ensuring the normal operation of the disconnector, and further improving the safety of the operation and the stability of the device;

[0029] Copper nose crimping: used to connect the direct shunt line with the wire clamp, so that the current can be transmitted efficiently, reducing energy loss, and making the connection firm and reliable, avoiding problems such as looseness and poor contact during use, which may affect the shunt effect;

[0030] One-time action tripping: The wire clamp is connected to the insulating operating rod, and the wire clamp and the insulating operating rod are designed to be separated from the insulating operating rod in a one-time action, so that the wire clamp can be accurately fixed on the heating part of the disconnector to achieve effective shunt connection; after the operation is completed, the insulating operating rod can be separated from the wire clamp conveniently and quickly, so that the operator can smoothly complete the disassembly and evacuation of the device, reducing the operation time and operation difficulty, while reducing the risk of damage to equipment or personnel due to improper operation, ensuring the safety and efficiency of live work.

[0031] A method for processing heat-generating belts of disconnectors, comprising the above modules and the clamp part and the direct-connected shunt part; the clamp part comprises a contact side clamp and a static contact side clamp, the moving contact side clamp is a G-type clamp, the static contact side clamp is an E-type clamp, the direct-connected shunt wire is a copper multi-strand conductive copper stranded wire, and its cross-sectional area is 200mm 2 ; Including an insulating rod for installing the wire clamp and the direct-connected shunt line, the insulating rod is made of fiberglass epoxy resin, has a length of 5.6m, and a withstand voltage rating of 220kV.

[0032] As a preferred solution of the present invention, the specific steps of the method for processing heat-generating belts of an isolating switch are as follows:

[0033] Preparation before operation: Test weather conditions to ensure there is no thunder, rain, snow, hail, or wind force 5 or above. At the same time, test that the air humidity is not more than 80%; perform segmented insulation resistance test on the insulating rods, using a 2500V insulation megger or insulation meter for testing, with a resistance value of no less than 700MΩ, to ensure good insulation performance of the insulating rods and ensure operation safety;

[0034] Device assembly: First, connect the two insulating rods to ensure that they are firmly connected. During operation, the insulating rods will not loosen or separate. According to the structural characteristics of the disconnector, there are round-mouth wire clamps and flat-mouth wire clamps. Install and fix the two wire clamps at the interface of the insulating rods and rotate them to the innermost part of the slot to ensure that the installation position of the wire clamps is accurate and stable, so as to prepare for the subsequent connection with the disconnector.

[0035] Lift the device to complete the direct connection operation: the operator lifts the assembled device and moves it horizontally to the direct connection position. During the movement, pay attention to the wind direction and stand upwind to operate to prevent deviation caused by unstable holding, so as to ensure the accuracy and safety of the operation; control the insulating rod to clamp the wire clamp steadily on the heating part of the disconnector at the specified position. For the GW17 disconnector, the G-type wire clamp is clamped on the upper conductive arm, and the E-type wire clamp is fixed on the ground knife connecting plate, and then rotated and tightened to make the wire clamp closely connected with the disconnector components to achieve good electrical conduction, so as to share the current of the heating point through the direct connection shunt line;

[0036] Removing the rod: After the operator makes sure that the wire clamp is fastened in place, he or she slightly rotates the insulating rod in the opposite direction to release it. This release mode is designed as a one-time action to ensure smooth release and easy operation. The insulating rod is removed smoothly to complete the separation operation of the device and the disconnector.

[0037] Post-operation inspection and finishing work: Inspect the treated isolating switches and monitor temperature changes by including but not limited to infrared temperature measurement methods to effectively alleviate heating defects and reduce the equipment temperature to below the target temperature.

[0038] The beneficial effects of adopting the above technical solution are: improving power supply reliability, realizing live processing of heating defects of disconnectors, avoiding the impact of power outages and maintenance on users' electricity consumption, especially during special power supply and load peak periods, ensuring the continuity of power supply, significantly improving power supply reliability, and enhancing the power grid's support capacity for social production and life; timely handling of heating defects reduces the risk of disconnector failure, reduces power outages caused by equipment failure, ensures the safe and stable operation of the power grid, and provides a stable power environment for social and economic development; improves maintenance efficiency and economic benefits, greatly shortens maintenance time; reduces maintenance costs, reduces the consumption of manpower, material resources and time, and reduces the power loss caused by power outages, with significant economic benefits; promotes technological progress and management innovation, fills the gap in the maintenance technology of disconnector heating, provides new technical means for the industry, and promotes the development of power equipment maintenance technology; opens up new ideas for equipment defect handling, promotes the transformation of maintenance mode to a combination of live processing and power outage processing, forms a new equipment management archive and status maintenance mode, improves the equipment management level and power grid operation efficiency, and lays a foundation for the sustainable development of the power industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 :Overall scheme diagram;

[0040] Figure 2 :Device design schematic diagram;

[0041] Figure 3 : Schematic diagram of moving contact;

[0042] Figure 4 :G type wire clamp diagram;

[0043] Figure 5 :G type wire clamp design drawing;

[0044] Figure 6 : E-type wire clamp;

[0045] Figure 7 : Schematic diagram of direct connection shunt line;

[0046] Figure 8 : Schematic diagram of thread fastening;

[0047] Fig. 9 : Copper nose crimping;

[0048] Fig.10 : Overall connection diagram. DETAILED DESCRIPTION

[0049] The principles of the present disclosure will now be described with reference to several exemplary embodiments shown in the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that these embodiments are described only to facilitate those skilled in the art to better understand and implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way.

[0050] In the description of the following embodiments, specific details such as specific system structures, technologies, etc. are proposed for illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, and methods are omitted to prevent unnecessary details from hindering the description of the present application.

[0051] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components.

[0052] Example 1: Specific presentation of the system and operation method

[0053] 1. System composition and working principle

[0054] 1. Overall system architecture

[0055] A heat-generating heating treatment control system for an isolating switch is mainly composed of a temperature monitoring module, a current acquisition module, a control module, a shunt module, an insulating rod and other parts. Among them, the temperature monitoring module is responsible for real-time monitoring of the temperature condition of the isolating switch. It is installed at a specific position on the isolating switch and can continuously obtain temperature data; the current acquisition module is used to collect current information of the isolating switch and is also installed at a suitable position to accurately collect current data. The control module is connected to the temperature monitoring module and the current acquisition module, receives the data collected by the two, and determines whether the isolating switch is heated according to the preset logic. When the monitored temperature exceeds the preset temperature threshold or the collected current exceeds the preset current threshold, the control module determines that the isolating switch is heated, and then controls the shunt module to work. Under the command of the control module, the shunt module is tightly connected to the moving and static contacts of the isolating switch through the wire clamp part it contains, and uses the direct shunt line to shunt part of the current to reduce the current density of the heating part of the isolating switch, and finally achieves the purpose of reducing the heating temperature, ensuring that the isolating switch can operate safely and stably. The insulating rod is used to install wire clamps and direct-connected shunt lines. It is made of fiberglass epoxy resin, with a length of 5.6m and a withstand voltage rating of 220kV. It plays a key role in support and insulation in the entire system.

[0056] (II) Detailed design of diversion module

[0057] 1. Wire clamp part

[0058] Moving contact side clamp (G-type clamp): The G-type clamp is specially designed to adapt to the shape of the moving contact of the disconnector. The contact ratio of its structure and the circumference of the conductive arm is based on the formula Among them, C is the basic ratio, A is the actual contact circle length, and B is the total circumference length of the conductive arm. The calculated ratio is not less than 87.5%, and the contact circle range angle is (0°-180°). The contact part is made of special conductive alloy material to ensure good conductivity and contact stability. The clamping force of the G-type wire clamp is adjusted by a precisely designed threaded fastening device. The threaded fastening method is based on the relationship between torque and friction clamping force (no less than 90% of the torque is used to overcome friction, and the remaining torque is used to generate clamping force). The wire clamp can be firmly connected to the moving contact of the disconnector. It is easy and firm to install, and effectively avoids loosening due to vibration and other factors during the operation of the disconnector, thereby reliably connecting with the moving contact to achieve efficient current conduction, thereby sharing the current at the hot point and reducing the heating temperature.

[0059] The static contact side clamp (E-type clamp): The selected E-type clamp is designed with full consideration of the structural characteristics of the static contact. The effective contact area ratio is based on the formula Where D is the effective contact area ratio, N is the actual effective contact area between the wire clamp and the static contact, and M is the total area of ​​the static contact base, which is calculated to be at least 95%. It is more in line with the structure of the static contact base and is reliably connected to the static contact base. The E-type wire clamp is tightly connected to the static contact through a unique fastening method, so that it can withstand greater tension and pressure, ensuring a stable electrical connection with the static contact during the shunting process, effectively sharing the current, and shunting the current at the hot spot to achieve the purpose of reducing the temperature. Both the G-type wire clamp and the E-type wire clamp are made of aluminum alloy, which reduces the overall weight of the wire clamp and facilitates installation operations in complex environments such as high-altitude operations.

[0060] 2. Direct connection shunt line: The direct connection shunt line uses high-purity copper multi-strand conductive copper stranded wire. The surface of each copper wire is specially plated to improve the oxidation resistance and corrosion resistance. Its cross-sectional area is precisely designed to be 200mm 2 The cross-sectional area is calculated based on the rated current and heating condition of the disconnector and the maximum load current of the main transformer 220kV side not exceeding 1200A. (Where S is the cross-sectional area of ​​the shunt line, I max is the maximum current, and D is the current carrying capacity calculated and determined. This design can not only effectively share the current, but also ensure that the temperature rise of the shunt line itself is within a safe range, ensuring that the shunt effect is significant and stable and reliable. The direct-connected shunt line and the wire clamp are connected by copper nose crimping. This connection method can enable efficient current transmission and reduce energy loss. At the same time, it makes the connection firm and reliable, effectively avoiding problems such as looseness and poor contact during use, thereby ensuring the shunt effect.

[0061] (III) Connection and fastening methods of each component

[0062] 1. Threaded fastening (for wire clamp): In the heat treatment control system of the disconnector, the connection between the wire clamp and the corresponding part of the disconnector is threaded fastening. The principle is based on the relationship between torque and friction clamping force, that is, no less than 90% of the torque is used to overcome friction, and the remaining torque is used to generate clamping force. For example, in actual operation, when a certain torque (such as 40N·M) is applied to a bolt of a certain specification (such as an M14 bolt), according to the threaded fastening clamping force calculation formula

[0063] By consulting the table of coarse thread nominal diameter and median diameter (the median diameter of the M14 bolt thread is 12.701mm), it can be calculated that the clamping force is 40÷10÷(12.701÷2÷1000)=630N), which can meet the clamping force requirements of the main manufacturers of disconnectors (greater than 600N), so that the wire clamp is firmly connected to the corresponding part of the disconnector, providing a reliable connection point for the direct-connected shunt line. During the operation of the disconnector, this stable connection ensures that the shunt line can effectively share the current of the hot spot, reduce the heating temperature, and ensure the normal operation of the disconnector, while further improving the safety of the operation and the stability of the device.

[0064] 2. Copper nose crimping (used for connecting direct-connected shunt wires and wire clamps): Copper nose crimping is used between direct-connected shunt wires and wire clamps. This connection method is based on its ability to efficiently transmit current, reduce energy loss, and make the connection firm and reliable. In practical applications, by optimizing the design and crimping process of the copper nose, the connection is ensured to be firm, and problems such as looseness and poor contact during use are avoided, thereby ensuring the shunting effect. For example, when performing a resistance test on the connection part, the copper nose crimping method can show a smaller resistance value than other connection methods (such as clamp crimping), effectively reducing energy loss and improving shunting efficiency.

[0065] 3. One-time tripping (connection between the wire clamp and the insulating operating rod): The design of one-time action between the wire clamp and the insulating operating rod is used to disengage the wire clamp from the insulating operating rod. During the operation, when the operator lifts the device and accurately fixes the wire clamp on the hot part of the disconnector, this connection method can ensure that the wire clamp is firmly installed and achieve effective shunt connection. After the operation is completed, the operator can slightly rotate the insulating rod in the opposite direction to make the wire clamp smoothly tripped at one time, and the insulating operating rod can be separated from the wire clamp conveniently and quickly, so that the operator can smoothly complete the disassembly and evacuation of the device. This not only reduces the operation time and operation difficulty, but also reduces the risk of damage to equipment or personnel due to improper operation, and effectively ensures the safety and efficiency of live work.

[0066] 2. Implementation steps of the treatment method for heating heat of isolating switch

[0067] (I) Preparation before operation

[0068] 1. Weather and environment testing: Before carrying out the heat treatment operation of the disconnector, the weather conditions must be strictly tested. Ensure that there is no severe weather such as thunder, rain, snow, hail, etc. in the working environment, and the wind speed does not exceed level 5. At the same time, the air humidity is tested to be no more than 80%. Only when these weather and environmental conditions are met can subsequent operations be carried out to ensure the safety of the operation.

[0069] 2. Insulation performance test of insulation rod: Perform insulation resistance test on insulation rod in sections, use 2500V insulation megger or insulation tester for detection, and the resistance value is required to be no less than 700MΩ. In this way, the insulation performance of insulation rod is ensured to be good, thus providing reliable insulation guarantee for subsequent live work and preventing safety accidents caused by insulation problems.

[0070] (II) Device assembly

[0071] 1. Insulation rod docking: dock the two insulation rods, and ensure that the docking is firm so that the insulation rods will not loosen or separate during subsequent operations. This step is the basis for the assembly of the entire device and provides a stable support structure for the subsequent installation of wire clamps and direct-connected shunt wires.

[0072] 2. Wire clamp installation: According to the structural characteristics of the disconnector (specifically divided into round-mouth wire clamps and flat-mouth wire clamps), install and fix the two wire clamps at the interface of the insulating rod, and rotate them to the innermost position of the slot. This operation can make the installation position of the wire clamp accurate and stable, fully prepare for the subsequent accurate connection with the disconnector, and ensure that the wire clamp can closely cooperate with the moving and static contacts of the disconnector.

[0073] (III) Lift the device to complete the direct connection operation

[0074] 1. Lifting and moving the device: The operator lifts the assembled device steadily and moves it horizontally to the direct connection position. During the movement, the operator must pay attention to the wind direction and stand upwind to prevent the device from shifting due to unstable control caused by the wind. This operation requires the operator to have high operating skills and safety awareness to ensure the accuracy and safety of the operation.

[0075] 2. Wire clamp connection and tightening: Control the insulating rod to clamp the wire clamp steadily at the specified position (i.e. the heating part of the disconnector). For the GW17 disconnector, the G-type wire clamp is clamped on the upper conductive arm, and the E-type wire clamp is fixed on the ground knife connecting plate. Then rotate and tighten the wire clamp to make the wire clamp tightly connected to the disconnector component to achieve good electrical conduction. In this way, when the shunt module is working, the direct-connected shunt line can effectively share the current at the heating point and reduce the heating temperature of the disconnector.

[0076] (IV) Take the rod

[0077] 1. Check the tightness of the wire clamp: The operator can only remove the pole after confirming that the wire clamp is tightened in place. This step requires the operator to carefully check the connection between the wire clamp and the disconnector components to ensure a firm connection and avoid loosening or falling off of the wire clamp during the pole removal process.

[0078] 2. Disconnection and removal of the insulating rod: Slightly rotate the insulating rod in the opposite direction to disconnect it. This disconnection method is designed as a one-time action to ensure smooth disconnection and easy operation. The operator must follow the operating specifications during the disconnection process, smoothly remove the insulating rod, and complete the separation operation of the device and the disconnector. This process requires the operator to be skilled in operation and accurate in action to ensure the safety and efficiency of the entire rod removal process.

[0079] (V) Post-operation inspection and finishing work

[0080] 1. Temperature monitoring and inspection: Inspect the treated isolating switch and monitor the temperature change by infrared temperature measurement and other methods. Observe whether the temperature of the isolating switch drops below the target temperature to determine whether the heating defect has been effectively alleviated. If the temperature does not reach the expected effect, further analysis of the cause is required and corresponding measures should be taken.

[0081] 2. Equipment arrangement and record: After confirming that the heating problem of the isolating switch has been effectively handled, clean up the work site. The ground cooperates with the electrician to assist in counting and sorting the tools and tools, and repack the insulating rods into the canvas bag. The person in charge of the work shall handle the termination procedures of the live direct-connected isolating switch work ticket, including acceptance and confirmation signature. At the same time, fill in the maintenance record in detail, record the relevant information of this operation, such as operation time, isolating switch model, temperature before treatment, temperature after treatment, operation steps, etc., to provide a reference for subsequent equipment maintenance and management.

[0082] During the entire process of isolating switch heating and electrification, each module and component works together and is operated strictly in accordance with the above implementation steps to ensure that the heating temperature of the isolating switch can be effectively reduced, the safe and stable operation of the isolating switch can be guaranteed, and the power supply reliability can be improved. At the same time, operators need to strictly abide by the operating procedures and pay attention to safety matters to ensure that the live working process is safe and efficient.

[0083] Example 2: Heat treatment of GW17 type isolating switch in 220kV substation

[0084] 1. Implementation background and preparation

[0085] In a 220kV substation, the moving contact finger and static contact conductive rod of a GW17 type disconnector that had been in operation for many years were seriously ablated, with the heating temperature reaching 140℃ (similar to the heating situation that Shao 222A disconnector had experienced), and a serious defect had been reported. After receiving the defect report, the substation maintenance QC team responded quickly and prepared to use the newly developed heat-generating heating treatment device to handle it.

[0086] Before the operation, the team members strictly followed the operating specifications for preparation. First, the weather conditions were tested. There was no thunder, rain, snow, or hail on that day. The wind force was level 3 and the air humidity was 70%, which met the operation requirements. Then the insulation resistance of the insulating rod was tested in sections. A 2500V insulation megger was used to test it. The resistance of each section of the insulating rod was not less than 700MΩ, ensuring good insulation performance.

[0087] 2. Device assembly and operation process

[0088] Reference Figure 1-10 When assembling the device, members firmly dock two 5.6m long fiberglass epoxy resin insulating rods. This type of insulating rod has excellent insulation performance (voltage rating of 220kV) and mechanical strength, and its length design can ensure that operators can operate at a safe distance. Then, the G-type wire clamp and E-type wire clamp made of aluminum alloy are installed and fixed at the interface of the insulating rod and rotated to the innermost of the slot. The wire clamp made of aluminum alloy is light and easy to operate. The G-type wire clamp is adapted to the conductive arm on the side of the moving contact. Its structural design makes the circumferential contact ratio with the conductive arm reach 87.5%, and the contact circumferential range angle is 0°-180°. The threaded fastening method (applying 40N·M torque to the M14 bolt produces a clamping force greater than 600N) ensures a firm connection; the E-type wire clamp is used for the static contact base. Its form fits the base structure, and the effective contact area ratio reaches 95%, which can be tightly connected with the static contact.

[0089] The operator lifts the assembled device and moves it horizontally to the heating part of the disconnector. During the movement, the operator stands upwind to prevent the grip from being unstable due to the wind direction. After reaching the designated position, the insulating rod is controlled to clamp the G-type wire clamp steadily on the upper conductive arm, and the E-type wire clamp is fixed on the ground knife connecting plate, and then rotated and tightened to make the wire clamp tightly connected to the disconnector component to achieve good electrical conduction. At this time, the direct-connected shunt line (high-purity copper multi-strand conductive copper stranded wire, cross-sectional area 200mm 2 ) begins to play a role, it shunts part of the current and reduces the current density in the heating part. The special coating treatment on the surface of each copper wire of the shunt line improves the oxidation resistance and corrosion resistance. Its cross-sectional area is calculated and determined based on the rated current of the disconnector, the heating situation and the maximum load current on the 220kV side of the main transformer. It can effectively share the current and ensure its own temperature rise safety.

[0090] 3. Treatment effect and follow-up inspection

[0091] After 3 hours of treatment, the temperature of the isolating switch was monitored by an infrared thermometer and gradually decreased and finally stabilized at 85°C, which was lower than the target temperature of 90°C. The heating defect was effectively alleviated.

[0092] After the operation is completed, the operator checks the tightening of the wire clamp, and after confirming that it is correct, slightly rotates the insulating rod in the opposite direction, and uses the one-time action trip design to successfully remove the insulating rod to complete the separation operation of the device and the disconnector. After that, the team members conducted a follow-up inspection of the disconnector, including observing whether there are any abnormalities in the appearance of the equipment, measuring the insulation resistance again, etc., to ensure that the equipment has returned to normal operation. This processing process successfully verified the effectiveness of the invention in practice and ensured the safe and stable operation of the substation.

[0093] Example 3: Emergency treatment during the peak period of summer electricity consumption

[0094] 1. Problems and challenges

[0095] During the peak period of electricity consumption in summer, the electricity consumption in a certain area increased significantly, and the power supply pressure was huge. At this time, the GW17 type disconnector in an important 220kV substation had a heating problem. If the traditional power outage maintenance method was used, it would cause a large area of ​​users to lose power, affecting the normal production and living order of society. Therefore, it was decided to use the newly invented live processing device to solve the problem.

[0096] The heat-generating part of the isolating switch is mainly concentrated at the connection between the moving contact and the static contact. The temperature continues to rise and has reached 130°C. The situation is critical. The maintenance personnel need to quickly reduce the temperature of the isolating switch without power outage and ensure safety to ensure the continuity of power supply.

[0097] 2. Device application process

[0098] The maintenance personnel quickly prepared the live-handling device, and the insulation rods, wire clamps, direct-connected shunt wires and other components had been checked in advance. During the operation, the insulation rods provided stable support and reliable insulation for the entire device. Its fiberglass epoxy resin material maintained good insulation performance in the high temperature and high load summer environment, ensuring that the operator maintained a safe distance from the live body.

[0099] G-type and E-type clamps play a key role in connecting disconnectors. The G-type clamp is tightly connected to the moving contact by virtue of its special design, effectively conducting the current to the direct-connected shunt line; the E-type clamp firmly connects the static contact to provide a stable circuit for the shunt current. The copper nose crimping method of the direct-connected shunt line ensures the firmness and conductivity of the connection, allowing the current to be efficiently shunted. The structure of the multi-strand conductive copper stranded wire still maintains good flexibility at high temperatures, which is convenient for installation and operation. At the same time, its precisely designed cross-sectional area effectively shares the current in the heating part and reduces the temperature.

[0100] 3. Achievements and Significance

[0101] After about 2.5 hours of treatment, the temperature of the disconnector dropped to 88°C, successfully below the target temperature of 90°C, and the heating problem was effectively controlled. This achievement ensured that the substation could continue to supply power stably during the peak period of summer power consumption, avoiding huge losses to users due to power outages.

[0102] This successful handling not only demonstrates the practicality and efficiency of the invention in emergency situations, but also provides important technical support for ensuring power supply during the peak period of summer power consumption. At the same time, it also accumulates valuable experience for the subsequent handling of similar situations, promotes the application and development of live working technology in the power system, and is of great significance to improving the overall reliability of the power grid.

[0103] Example 4: Application in the maintenance of old substation equipment

[0104] 1. Equipment status and processing requirements

[0105] The GW17 disconnector in an old 220kV substation has been in operation for 15 years. The equipment is seriously aged, and the oxidation and dust accumulation at the contact between the moving and static contacts are obvious, which leads to increased circuit resistance and frequent heating defects. The traditional treatment method is difficult to meet the needs of non-stop maintenance, which seriously affects the normal operation of the substation and the life of the equipment.

[0106] During a routine inspection, it was found that the heating temperature of the isolating switch reached 125°C. Effective measures were urgently needed to reduce the temperature, improve the operating stability of the equipment, and extend the service life of the equipment.

[0107] 2. Implementation details and operation steps of the device

[0108] The maintenance personnel first assembled the device. The length and material of the insulating rod ensured the safety and convenience of operation in the complex environment of the old substation. Its 5.6m length enabled the operator to safely approach the disconnector in a limited space for operation, and the insulating properties of the fiberglass epoxy resin material effectively prevented the risk of electric shock.

[0109] When connecting the disconnector, the unique design advantages of the G-type wire clamp and the E-type wire clamp are fully demonstrated. The threaded fastening device of the G-type wire clamp ensures that the moving contact can still be firmly connected in the vibration environment of the aging equipment. The contact part of its special conductive alloy material ensures good conductivity and effectively shares the current of the hot spot; the fitting design of the E-type wire clamp and the static contact base increases the effective contact area, and the unique fastening method withstands greater tension and pressure to maintain a stable electrical connection. The copper multi-strand structure of the direct-connected shunt line adapts to the structural changes of the equipment after aging, is easy to install, and has a significant shunt effect. Its cross-sectional area is 200mm 2 The design has been precisely calculated to effectively cope with the heating conditions of the old disconnector.

[0110] 3. Treatment effects and long-term impacts

[0111] After being treated with the live treatment device, the temperature of the isolating switch dropped to 87°C within 2 hours, meeting the requirements for safe operation of the equipment. After a period of observation, the heating condition of the equipment was significantly improved and no high temperature alarm occurred, effectively extending the service life of the equipment.

[0112] This process provides a new solution for the maintenance of old substation equipment, reduces the number of power outages and maintenance caused by frequent heating of equipment, and improves the overall operational reliability of the substation. At the same time, it also provides reference experience for the maintenance of equipment in other old substations, promotes the development of live maintenance technology for old equipment in the power system, and has positive significance for ensuring the stable operation of the power grid.

[0113] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A heat-generating belt power processing control system for an isolating switch, characterized in that: Includes the following basic modules: Temperature monitoring module: used to monitor the temperature of the isolation switch in real time; Current acquisition module: used to collect the current of the isolating switch; Control module: connected to the temperature monitoring module and the current acquisition module, used to determine whether the isolating switch is heated according to the monitored temperature and the collected current, and control the shunt module to work when it is determined that the isolating switch is heated; Diversion module: Based on formula Where R a is the original branch resistance, R b is the parallel shunt branch resistance, R eq is an equivalent resistor, connected to the control module and used to shunt the isolating switch under the control of the control module to reduce the heating temperature of the isolating switch; The connection relationship and function realization of each part are as follows: A1. The temperature monitoring module and current acquisition module transmit the collected data to the control module in real time A2. After processing and judging, the control module sends control instructions to the diversion module A3. Under the precise control of the control module, the shunt module is tightly connected to the moving and static contacts of the isolating switch through the wire clamp. The direct shunt line shunts part of the current to reduce the current density in the heating part of the isolating switch, thereby achieving the purpose of reducing the heating temperature and ensuring the safe and stable operation of the isolating switch.

2. A heat-generating belt electrification processing control system for an isolating switch according to claim 1, characterized in that: The control module determines whether the isolating switch is heated by: when the monitored temperature exceeds a preset temperature threshold or the collected current exceeds a preset current threshold, the isolating switch is determined to be heated, specifically: Real-time monitoring of the temperature and current of the isolating switch: The temperature monitoring module and current acquisition module installed on the isolating switch are used to continuously collect temperature and current data and timely capture the changes in temperature and current; The heating condition of the isolating switch is judged according to the monitored temperature and the collected current: when it is judged that the isolating switch is heated, the shunt module is controlled to shunt the isolating switch to reduce the heating temperature of the isolating switch; after receiving the monitoring data, the control module analyzes it according to the preset judgment logic, and if the temperature exceeds the preset temperature threshold or the current exceeds the preset current threshold, it is judged that the isolating switch is heated. At this time, the control module immediately sends a start signal to the shunt module, and the shunt module starts working, and part of the current is shunted through the wire clamp and the direct shunt line to reduce the current density of the heating part, thereby reducing the heating temperature; during the shunting process, the temperature and current changes are continuously monitored, and the shunting strategy is adjusted according to the actual situation.

3. The isolating switch heat-generating belt electrification processing control system according to claim 1, characterized in that: The shunt module comprises: a wire clamp part for connecting a moving contact and a stationary contact of the isolating switch; and a direct-connected shunt wire part connected between the wire clamps for sharing the current of the isolating switch.

4. A heat-generating belt electrification processing control system for an isolating switch according to claim 3, characterized in that: The clamp part comprises: Moving contact side wire clamp: A specially designed G-type wire clamp is used, and its structure is highly adapted to the shape of the moving contact of the disconnector, based on the following formula: Among them, C is the basic ratio, A is the actual contact circumference length, and B is the total circumference length of the conductive arm; the structural design has a contact ratio of not less than 87.5% with the conductive arm circumference, and the contact circumference range angle is 0°-180°. The contact part is made of special conductive alloy material to ensure good conductivity and contact stability. The clamping force of the G-type wire clamp is adjusted by a precisely designed threaded fastening device to ensure that it is installed and tightened to avoid loosening due to vibration and other reasons during operation; it is reliably connected with the moving contact to achieve efficient current conduction, thereby sharing the current at the heating point and reducing the heating temperature; Static contact side clamp: Use E-type clamp, which is designed based on the formula Where D is the effective contact area ratio, N is the actual effective contact area between the wire clamp and the static contact, and M is the total area of ​​the static contact base; the structural characteristics of the static contact are fully considered, the form is more in line with the structure of the static contact base, and the effective contact area ratio is at least 95%; the E-type wire clamp is tightly connected to the static contact through a unique fastening method so that it can withstand greater tension and pressure, ensuring a stable electrical connection with the static contact during the shunting process, effectively sharing the current to achieve the shunting of the current at the hot point and thus achieve the purpose of reducing the temperature.

5. The isolating switch heat-generating belt electrification processing control system according to claim 3, characterized in that: The direct connection shunt line part: the direct connection shunt line adopts high-purity copper multi-strand conductive copper stranded wire, and its cross-sectional area is precisely designed to be 200mm 2 According to the rated current and heating condition of the disconnector and the maximum load current of the main transformer 220kV side not exceeding 1200A, the cross-sectional area is determined by calculation. The calculation formula is as follows: It not only effectively shares the current, but also ensures that the temperature rise of the shunt line itself is within a safe range, ensuring that the shunt effect is significant, stable and reliable.

6. The isolating switch heat-generating belt electrification processing control system according to claim 3, characterized in that: The G-type wire clamp and the E-type wire clamp are both made of aluminum alloy, which reduces the overall weight of the wire clamp and facilitates installation and operation, and is particularly suitable for complex environments of high-altitude operations.

7. The isolating switch heat-generating belt electrification processing control system according to claim 1, characterized in that: It also includes an insulating rod for installing the wire clamp and the direct-connected shunt line. The insulating rod is made of glass fiber reinforced plastic epoxy resin, has a length of not less than 5.6m, and a withstand voltage level of at least 220kV.

8. A heat-generating belt power processing control system for an isolating switch according to claims 3-7, characterized in that: The specific fastening methods for connecting the various parts are as follows: Threaded fastening: used for wire clamps, the torque and friction clamping force relationship is not less than 90%. The torque is used to overcome the friction, and the remaining torque is used to generate the clamping force to firmly connect the wire clamp to the corresponding part of the disconnector, providing a reliable connection point for the direct-connected shunt line. During the operation of the disconnector, the stable connection ensures that the shunt line can effectively share the current of the hot spot, thereby reducing the heating temperature to ensure the normal operation of the disconnector, and further improve the safety of the operation and the stability of the device. Copper nose crimping: used to directly connect the shunt line and the wire clamp to enable efficient current transmission, reduce energy loss and make the connection firm and reliable, avoiding problems including but not limited to looseness and poor contact during use, which may affect the shunt effect; One-time action tripping: The wire clamp is connected to the insulating operating rod. The wire clamp and the insulating operating rod are separated by a one-time action design, so that the wire clamp is accurately fixed on the hot part of the disconnector to achieve effective shunt connection; after the operation is completed, the insulating operating rod and the wire clamp can be separated quickly and conveniently, so that the operator can smoothly complete the disassembly and evacuation of the device, reducing the operation time and operation difficulty while reducing the risk of damage to equipment or personnel due to improper operation, ensuring the safety and efficiency of live work.

9. A method for processing heat-generating belt of an isolating switch, characterized in that: The invention comprises the modules of claims 1 to 8 and the clamp part and the direct-connected shunt part; the clamp part comprises a contact side clamp and a static contact side clamp, the dynamic contact side clamp is a G-type clamp, and the static contact side clamp is an E-type clamp; the direct-connected shunt wire is a copper multi-strand conductive copper stranded wire with a cross-sectional area of ​​200 mm 2 ; Including an insulating rod for installing the wire clamp and the direct-connected shunt line; the insulating rod is made of fiberglass epoxy resin, with a length of not less than 5.6m and a withstand voltage rating of 220kV.

10. A method for processing heat-generating belts of disconnecting switches according to claim 9, characterized in that: The specific steps are: Preparation before operation: Test weather conditions to ensure that there are no thunder, rain, snow, hail, or wind force 5 or above. At the same time, test that the air humidity is not more than 80%. Perform segmented insulation resistance tests on the insulating rods. Use a 2500V insulation megger and insulation meter to test. The resistance value is not less than 700MΩ to ensure that the insulation performance of the insulating rods is good and to ensure operation safety. Device assembly: First, firmly connect the two insulating rods to prevent them from loosening or separating during operation. According to the structural characteristics of the disconnector, there are round-mouth wire clamps and flat-mouth wire clamps. Fix the two wire clamps at the interface of the insulating rods and rotate them to the innermost part of the slot to ensure that the installation position of the wire clamps is accurate and stable, so as to prepare for the subsequent connection with the disconnector. Lift the device to complete the direct connection operation: the operator lifts the assembled device and moves it horizontally to the direct connection position; Pay attention to the wind direction during the movement, stand in the upwind position to prevent deviation caused by unstable grip, and ensure the accuracy and safety of the operation; control the insulating rod to clamp the wire clamp steadily at the designated position of the hot part of the disconnector: for the GW17 disconnector, the G-type wire clamp is clamped on the upper conductive arm, and the E-type wire clamp is fixed on the ground knife connecting plate, and then rotate and tighten to make the wire clamp closely connected with the disconnector components to achieve good electrical conduction so as to share the hot point current through the direct shunt line; Remove the rod: After confirming that the wire clamp is fastened in place, the operator slightly rotates the insulating rod in the opposite direction to release it. This release mode is a one-time action design to ensure smooth release and easy operation. Remove the insulating rod smoothly and complete the separation operation of the device and the disconnector. Post-operation inspection and finishing work: Inspect the treated isolating switches and monitor temperature changes by including but not limited to infrared temperature measurement methods to effectively alleviate heating defects and reduce the equipment temperature to below the target temperature.

Images