A high voltage cable for power plants

Abstract

The application relates to a power plant high-voltage cable in the field of cables, which comprises a cable main body, a plurality of outer protective layers sleeved on the cable main body, a reinforced wire harness group arranged between the outer protective layers and the cable main body, the reinforced wire harness group comprising a plurality of fiber reinforced wires and an optical fiber sensing wire harness, the optical fiber sensing wire harness being provided with an optical fiber sensor, and a distribution protection sleeve connected between two adjacent outer protective layers; the distribution protection sleeve comprises a partition ring embedded in the cable main body, two pairs of protective rings fixedly connected to the inner wall of the partition ring, two pairs of nozzles fixedly connected to the two pairs of heat insulation bags, the two pairs of nozzles being respectively inserted into the inner protective layer and the outer protective layer, and fire-extinguishing particles being filled in the protective rings; the protective rings inject the fire-extinguishing particles into the inner protective layer and the outer protective layer after being heated, the running state of the cable is monitored in real time, fire-extinguishing particles are arranged in the distribution protection sleeve, and the fire-extinguishing particles can be quickly released when the cable is abnormal, so that the spread of fire is effectively inhibited.

Description

Technical Field

[0001] The present invention relates to a high-voltage cable for power plants, and more particularly to a high-voltage cable for power plants used in the field of cables. Background Technology

[0002] High-voltage cables used in power plants are a critical component of power transmission systems, connecting generator sets to the power grid or transmitting high-voltage power within the power plant. These cables are typically designed to withstand high voltage and high current while ensuring low loss and high reliability. High-voltage cables generally consist of a conductor, insulation layer, shielding layer, and protective jacket. The conductor is usually made of copper or aluminum to ensure good electrical conductivity. The insulation layer uses high-voltage resistant materials, such as cross-linked polyethylene (XLPE) or polyvinyl chloride (PVC), to ensure the cable does not break down under high voltage. The shielding layer prevents electromagnetic interference and protects the cable from external environmental influences. The protective jacket provides mechanical protection and waterproofing.

[0003] Chinese invention patent CN108933003B discloses an ultra-high voltage insulated gas pipeline cable. The invention has a reasonable structural design and excellent material performance. Its cable has a high voltage level and can be used for high voltage output lines of hydropower, thermal power and nuclear power with a voltage of 500kV. The cable not only has low cost and low safety risk, but also can ensure the safe operation and work of equipment and personnel, meeting the needs of the actual working environment of power plants today.

[0004] Chinese invention patent CN116779236B discloses a high-voltage cable that uses a plate structure for impact protection. The plate structure and its containment mechanism achieve fluid cooling to prevent overheating. Furthermore, after a cable breakdown, the airflow helps workers quickly locate the damage in complex environments, making repairs more convenient.

[0005] The existing high-voltage cables used in power plants lack sufficient monitoring capabilities, making it inconvenient to detect potential operational hazards in a timely and accurate manner. Furthermore, when cables catch fire, the fire spreads rapidly, and existing cables lack adequate countermeasures. This can easily lead to huge economic losses and serious safety accidents. Summary of the Invention

[0006] The technical problem this invention aims to solve in response to the aforementioned existing technologies is the insufficient monitoring capabilities of existing high-voltage cables used in power plants. This makes it inconvenient to detect potential operational hazards in a timely and accurate manner during cable use. Furthermore, when cables catch fire, the fire spreads rapidly, and existing cables lack effective countermeasures. This can easily lead to significant economic losses and serious safety accidents.

[0007] To solve the above problems, the present invention provides a high-voltage cable for power plants, including a cable body, the cable body including a core, an inner protective layer covering the outside of the core, multiple outer protective layers on the inner protective layer, a reinforcing wire bundle group between the outer protective layer and the cable body, the reinforcing wire bundle group including multiple fiber reinforcing wires and fiber optic sensing wire bundle, the fiber optic sensing wire bundle being equipped with a fiber optic sensor.

[0008] A distributed protective sleeve connects two adjacent outer protective layers;

[0009] The distributed protective sleeve includes an isolation ring embedded in the cable body. Both ends of the isolation ring are connected to multiple wiring units for wiring with fiber optic sensing bundles. Two pairs of protective rings are fixedly connected to the inner wall of the isolation ring, and two pairs of nozzles are fixedly connected to the protective rings. The output ends of the nozzles are sealed by thermal break beads. The two pairs of nozzles are inserted into the inner protective layer and the outer protective layer, respectively. The protective rings are filled with fire extinguishing particles. When the protective rings are heated, fire extinguishing particles are injected into the inner and outer protective layers. A terminal block that is electrically connected to multiple wiring units is embedded in the isolation ring.

[0010] The distribution protective sleeve is snapped with an outer bracket, which includes a pair of clamps, the inner ends of which are embedded with terminals for mating with the terminal block.

[0011] In the aforementioned high-voltage cables used in power plants, real-time monitoring of the cable's operating status was achieved, and fire extinguishing particles were installed inside the protective sheath, which could be quickly released in case of cable abnormalities, effectively suppressing the spread of fire.

[0012] As a further improvement of this application, a communication unit is provided on the outer bracket, and a distribution gateway connected to multiple communication units is provided at predetermined intervals. The distribution gateway is used to collect monitoring data collected by multiple terminal blocks.

[0013] As a further improvement of this application, the thermal cracking bead includes a hollow thin-walled shell filled with a liquid that expands easily when heated. When the cable temperature reaches a preset threshold, the liquid expands, causing the hollow thin-walled shell structure to crack.

[0014] As a further improvement of this application, auxiliary tubes are provided on both sides of the terminal block for insertion into the protective ring. A miniature air pump matching the auxiliary tubes is installed in the clamp, and when the auxiliary tubes input airflow into the protective ring, the protective ring releases fire extinguishing particles through the nozzle.

[0015] As another improvement of this application, the extinguishing particles include perfluorohexanone extinguishing agent.

[0016] As a further improvement to this application, the terminal block is damped and slidably connected within the clamping frame. The terminal block and the clamping frame are respectively equipped with mutually matched permanent magnets and electromagnets. By controlling the electromagnets to move the terminal block up and down, the connection and disconnection between the terminal block and the terminal block can be achieved.

[0017] As a further improvement to this application, an auxiliary monitoring system is also included, which includes a terminal processor connected to a monitoring module, a data processing module, a control module, and a communication module.

[0018] The monitoring module is used to collect monitoring data, including data on the internal and external environment of the cable collected by the reinforced cable harness group;

[0019] The data processing module is used to process and analyze monitoring data, and set the status of each distributed protection sleeve according to the analysis results of the monitoring data and the preset control scheme. The working status of the distributed protection sleeve includes isolated operation mode, continuous operation mode and emergency protection mode.

[0020] The isolated operation mode is set when the system is under high load. When the isolated operation mode is running, the distributed protection sleeve is disconnected from the distributed gateway.

[0021] The continuous operation mode is set when the system is working normally. When the continuous operation mode is running, the distributed protective cover connects to the distributed gateway and uploads monitoring data in real time.

[0022] The emergency protection mode is set when the monitoring data uploaded at any distribution protective sleeve exceeds the set value. When the emergency protection mode is running, the protective ring of the distribution protective sleeve at the corresponding location releases fire extinguishing particles.

[0023] The control module is used to adjust the distributed protective sleeve or external support to perform operation schemes that match the corresponding state according to the instructions of the data processing mode.

[0024] The communication module is used to establish communication connections and transmit data with multiple distributed gateways.

[0025] As another improvement of this application, the specific working process of the emergency protection mode includes: when the system detects abnormal monitoring data uploaded from any distribution protection sleeve, the data processing module of the auxiliary monitoring system will quickly analyze the data and trigger the emergency protection mode; at this time, the micro air pump in the outer bracket will respond quickly, inputting airflow into the protective ring to promote the release of fire extinguishing particles from the nozzle.

[0026] In summary, this solution enables real-time monitoring of the cable's operating status and adjusts the status of the distribution protection sleeve based on the monitoring data. The distribution protection sleeve is equipped with fire extinguishing particles, which can be quickly released in case of cable abnormalities, effectively suppressing the spread of fire and ensuring the safe operation of the power plant. Attached Figure Description

[0027] Figure 1 This is a perspective view of the cable according to the first embodiment of this application;

[0028] Figure 2 This is a cross-sectional view of the distribution protective sleeve in the first embodiment of this application;

[0029] Figure 3 This is a side sectional view of the distribution protective sleeve in the first embodiment of this application;

[0030] Figure 4 This is a perspective view of the protective sleeve according to the first embodiment of this application;

[0031] Figure 5 This is a cross-sectional view of the cable according to the first embodiment of this application;

[0032] Figure 6 This is a block diagram of the auxiliary monitoring system according to the second embodiment of this application.

[0033] Explanation of the labels in the diagram:

[0034] 1. Cable body; 11. Core; 12. Inner protective layer; 2. Outer protective layer; 31. Fiber reinforced wire; 32. Fiber optic sensing bundle; 4. Distribution protective sleeve; 41. Isolation ring; 42. Wiring unit; 43. Protective ring; 44. Terminal block; 5. Outer support; 51. Clamping frame; 52. Terminal post; 53. Auxiliary conduit. Detailed Implementation

[0035] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0036] Implementation method 1:

[0037] Figures 1-5 A high-voltage cable for power plants is shown, including a cable body 1, the cable body 1 including a core 11, an inner protective layer 12 covering the outside of the core, and multiple outer protective layers 2 sleeved on the inner protective layer. The inner protective layer 12 is made of porous flexible flame-retardant sponge, and the outer protective layer 2 is made of corrosion-resistant material.

[0038] A reinforcing wire bundle 3 is provided between the outer protective layer 2 and the cable body 1. The reinforcing wire bundle 3 includes multiple fiber reinforcing wires 31 and fiber optic sensing wire bundles 32. Fiber optic sensors are provided on the fiber optic sensing wire bundles 32. The fiber optic sensors are used to detect the temperature inside and outside the cable. The appropriate fiber optic sensors in the prior art are selected by those skilled in the art for setting.

[0039] A distributed protective sleeve 4 connects two adjacent outer protective layers 2;

[0040] The distribution protective sleeve 4 includes a partition ring 41 embedded in the cable body 1, and the outer protective layer 2 is fixedly connected to the outer wall of the partition ring 41. Both ends of the partition ring 41 are connected to multiple wiring units 42 for wiring with the fiber optic sensing bundle 32. The wiring units 42 can also be used for positioning and fixing the fiber reinforcement wire 31.

[0041] The fiber reinforcement wire 31 or the optical fiber sensing bundle 32 is straightened and fixed by two wiring units 42, and the optical fiber sensing bundle 32 can transmit monitoring data to the outside after being connected to the wiring unit 42.

[0042] The wiring unit 42 includes a threaded connector that is threadedly connected to the isolation ring 41, and one end of the isolation ring 41 is fixedly connected to the fiber reinforcement wire 31 or the optical fiber sensing wire bundle 32, while the other end is connected to a wire provided inside the isolation ring 41.

[0043] Two pairs of protective rings 43 are fixedly connected to the inner wall of the isolation ring 41. Two pairs of nozzles are fixedly connected to the protective rings 43. The output ends of the nozzles are all sealed by thermal break beads. The thermal break beads include a hollow thin-walled shell. The hollow thin-walled shell is filled with a liquid that is easily expanded by heat. When the cable temperature reaches a preset threshold, the liquid that is easily expanded by heat expands, causing the hollow thin-walled shell structure to break.

[0044] Two pairs of nozzles are inserted into the inner protective layer 12 and the outer protective layer 2 respectively. The protective ring 43 is filled with fire extinguishing particles. After the protective ring 43 is heated, fire extinguishing particles are injected into the inner protective layer 12 and the outer protective layer 2. The fire extinguishing particles include perfluorohexanone fire extinguishing agent. A terminal block 44 that is electrically connected to multiple wiring units 42 is embedded in the isolation ring 41.

[0045] When the thermal breakage bead at the nozzle output end of the protective ring 43 is heated, it breaks, and the protective ring 43 quickly releases fire extinguishing particles into the inner protective layer 12 and the outer protective layer 2. Since there are gaps in the outer protective layer 2 and the inner protective layer 12 is made of porous sponge material, the fire extinguishing particles can quickly penetrate into it, which facilitates the rapid improvement of the fire suppression capability at the distribution protective sleeve 4, provides additional safety for the cable, avoids the rapid spread of fire when the cable catches fire, and provides rescue time for fire fighting and rescue.

[0046] An outer bracket 5 is snapped onto the protective sleeve 4. The outer bracket 5 includes a pair of clamping frames 51. The inner end of the clamping frame 51 is embedded with a terminal post 52 for matching the terminal block 44. Both sides of the terminal post 52 are provided with auxiliary tubes 53 that are inserted into the protective ring 43. A miniature air pump matching the auxiliary tubes 53 is installed in the clamping frame 51. When the auxiliary tubes 53 input airflow into the heat insulation bag, the heat insulation bag releases fire extinguishing particles through the nozzle.

[0047] The terminal 52 is damped and slidably connected inside the clamp 51. The terminal 52 and the clamp 51 are respectively equipped with a matching permanent magnet and an electromagnet. By controlling the electromagnet to move the terminal 52 up and down, the terminal 52 can be connected to and disconnected from the terminal block 44.

[0048] The cable in this solution features multiple safety protections and intelligent monitoring functions. The reinforced cable harness group 3 not only enhances the cable's mechanical strength but also integrates sensors that can monitor the cable's internal and external environmental data in real time, ensuring stable operation under complex working conditions.

[0049] The distribution protective sleeve 4 between adjacent outer protective layers contains a protective ring 43. The fire extinguishing particles filled in the protective ring 43 can be rapidly released when the cable heats up abnormally, effectively suppressing the spread of fire and ensuring the safety of the power plant environment. At the same time, the design of the terminal block 44 on the distribution protective sleeve and the terminal post 52 on the outer support facilitates the flexible connection and disconnection of the cable, improving the convenience of cable maintenance.

[0050] The second implementation method:

[0051] Figure 6 As shown, a communication unit is provided on the outer bracket 5, and a distribution gateway connected to multiple communication units is provided at predetermined intervals. The distribution gateway is used to collect monitoring data collected by multiple terminal blocks 44.

[0052] Furthermore, the cable in this solution also includes an external auxiliary monitoring system, which includes a terminal processor connected to a monitoring module, a data processing module, a control module, and a communication module.

[0053] The monitoring module is used to collect monitoring data, including the internal and external environmental data of the cable collected by the reinforced cable harness group 3;

[0054] The data processing module is used to process and analyze monitoring data, and sets the status of each distributed protection sleeve 4 according to the analysis results of the monitoring data and the preset control scheme. The working status of the distributed protection sleeve 4 includes isolated operation mode, continuous operation mode and emergency protection mode.

[0055] The isolated operation mode is set when the system is under high load. When the isolated operation mode is running, the distributed protection sleeve 4 is disconnected from the distributed gateway.

[0056] The continuous operation mode is set when the system is working normally. When the continuous operation mode is running, the distributed protective cover 4 connects to the distributed gateway and uploads monitoring data in real time.

[0057] The emergency protection mode is set when the monitoring data uploaded at any distribution protective sleeve 4 exceeds the set value. When the emergency protection mode is running, the protective ring 43 of the corresponding distribution protective sleeve 4 releases fire extinguishing particles.

[0058] The control module is used to adjust the distributed protective sleeve 4 or the outer support 5 to execute the operation scheme that matches the corresponding state according to the instructions of the data processing mode.

[0059] The communication module is used to establish communication connections and transmit data with multiple distributed gateways.

[0060] The specific working process of the emergency protection mode includes: when the system detects that the monitoring data uploaded from any distribution protection sleeve 4 is abnormal, that is, exceeds the preset safety threshold, the data processing module of the auxiliary monitoring system will quickly analyze the data and trigger the emergency protection mode; at this time, the control module will accurately locate the corresponding distribution protection sleeve 4 with the problem according to the data analysis results, and immediately send a command to the corresponding outer support 5; after receiving the command, the micro air pump in the outer support 5 responds quickly, inputting airflow into the protective ring 43, promoting the release of fire extinguishing particles from the nozzle, so as to quickly improve the flame-retardant fire extinguishing capability of the distribution protection sleeve 4, effectively prevent the spread of fire, and achieve area isolation through the distribution protection sleeve 4.

[0061] In isolated operation mode, terminal block 44 and disconnect terminal 52 avoid system delays caused by data transmission under high load conditions and ensure system operating temperature. At this time, the fire extinguishing particles are only released when the thermal breakage beads inside the nozzle rupture due to excessive temperature in the cable area. In the isolated operation mode of this solution, the release of fire extinguishing particles is not affected, ensuring that the fire can still be suppressed by releasing fire extinguishing particles when the system is under high load or fault. It should be noted that the rate of spontaneous release of fire extinguishing particles due to the rupture of thermal breakage beads will be much lower than the release rate of fire extinguishing particles in emergency protection mode.

[0062] In summary, this solution enables real-time monitoring of the cable's operating status and adjusts the status of the distribution protection sleeve based on the monitoring data. The distribution protection sleeve is equipped with fire extinguishing particles, which can be quickly released in case of cable abnormalities, effectively suppressing the spread of fire and ensuring the safe operation of the power plant.

[0063] In light of current practical needs, the above-described embodiments adopted in this application are not limited to this scope of protection. Various changes made within the knowledge of those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A high-voltage cable for power plants, comprising a cable body (1), the cable body (1) comprising a conductor (11), the conductor being covered by an inner protective layer (12), and the inner protective layer being fitted with multiple outer protective layers (2), characterized in that: A reinforcing wire bundle group (3) is provided between the outer protective layer (2) and the cable body (1). The reinforcing wire bundle group (3) includes multiple fiber reinforcing wires (31) and an optical fiber sensing wire bundle (32). An optical fiber sensor is provided on the optical fiber sensing wire bundle (32). A distributed protective sleeve (4) is connected between two adjacent outer protective layers (2); The distribution protective sleeve (4) includes a partition ring (41) embedded in the cable body (1). Both ends of the partition ring (41) are connected to multiple wiring units (42) for wiring with the fiber optic sensing bundle (32). Two pairs of protective rings (43) are fixedly connected to the inner wall of the partition ring (41). Two pairs of nozzles are fixedly connected to the protective rings (43). The output ends of the nozzles are sealed by thermal break beads. The two pairs of nozzles are respectively inserted into the inner protective layer (12) and the outer protective layer (2). The protective rings (43) are filled with fire extinguishing particles. After the protective rings (43) are heated, fire extinguishing particles are injected into the inner protective layer and the outer protective layer (2). A terminal block (44) that is electrically connected to multiple wiring units (42) is embedded in the partition ring (41). The distribution protective sleeve (4) is snapped with an outer bracket (5), the outer bracket (5) includes a pair of clamps (51), and the inner end of the clamps (51) is embedded with a terminal post (52) for matching the terminal block (44). It also includes an auxiliary monitoring system, which includes a terminal processor connected to a monitoring module, a data processing module, a control module and a communication module; the monitoring module is used to collect monitoring data, which includes cable internal and external environment data collected by the reinforced wire harness group (3); The data processing module is used to process and analyze monitoring data, and set the status of each distributed protection sleeve (4) according to the analysis results of the monitoring data and the preset control scheme. The working status of the distributed protection sleeve (4) includes isolated operation mode, continuous operation mode and emergency protection mode. The isolated operation mode is set when the system is under high load. When the isolated operation mode is running, the distributed protection sleeve (4) is disconnected from the distributed gateway. The continuous operation mode is set when the system is working normally. When the continuous operation mode is running, the distribution protective sleeve (4) is connected to the distribution gateway and the monitoring data is uploaded in real time. The emergency protection mode is set when the monitoring data uploaded at any distribution protective sleeve (4) is greater than the set value. When the emergency protection mode is running, the protective ring (43) of the corresponding distribution protective sleeve (4) releases fire extinguishing particles. The control module is used to adjust the distribution protective sleeve (4) or the outer support (5) to perform the operation scheme that matches the corresponding state according to the instructions of the data processing mode. The communication module is used to establish communication connections and transmit data with multiple distribution gateways.

2. The high-voltage cable for power plants according to claim 1, characterized in that: The outer support (5) is equipped with a communication unit, and a distribution gateway connected to multiple communication units is set at intervals of a set distance. The distribution gateway is used to collect monitoring data collected by multiple terminal blocks (44).

3. The high-voltage cable for power plants according to claim 1, characterized in that: The thermal cracking bead includes a hollow thin-walled shell filled with a liquid that expands easily when heated. When the cable temperature reaches a preset threshold, the liquid expands, causing the hollow thin-walled shell structure to crack.

4. A high-voltage cable for power plants according to claim 1, characterized in that: Both sides of the terminal block (52) are provided with auxiliary tubes (53) that can be inserted into the protective ring (43). The clamp (51) is equipped with a miniature air pump that matches the auxiliary tube (53). When the auxiliary tube (53) inputs airflow into the protective ring (43), the protective ring (43) releases fire extinguishing particles through the nozzle.

5. A high-voltage cable for power plants according to claim 1, characterized in that: The extinguishing particles include perfluorohexanone extinguishing agent.

6. A high-voltage cable for power plants according to claim 1, characterized in that: The terminal block (52) is damped and slidably connected in the clamping frame (51). The terminal block (52) and the clamping frame (51) are respectively equipped with a matching permanent magnet and an electromagnet. By controlling the electromagnet to move the terminal block (52) up and down, the terminal block (52) and the terminal block (44) can be connected and disconnected.

7. A high-voltage cable for power plants according to claim 1, characterized in that: The specific working process of the emergency protection mode includes: when the system detects that the monitoring data uploaded at any distribution protective sleeve (4) is abnormal, the data processing module of the auxiliary monitoring system will quickly analyze the data and trigger the emergency protection mode; at this time, the micro air pump in the outer bracket (5) responds quickly, so that it inputs airflow into the protective ring (43) to promote the release of fire extinguishing particles from the nozzle.

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