A power system booster station, substation underground cable trench pumping system and method

Abstract

This invention provides a pumping system and method for underground cable trenches in power system substations and booster stations, belonging to the field of power system auxiliary equipment. It includes: a sump well installed at the cable trench, at least two drainage pumps, a liquid level detection device, and a controller. It also includes: a water level change rate detection module connected to the controller for real-time calculation of the water level rise rate. The controller has a built-in multi-mode adaptive drainage strategy, used to select any one or a combination of energy-saving intermittent mode, regular automatic mode, forced drainage early warning mode, and emergency forced mode to pump water from the cable trench based on the current water level value and water level rise rate collected by the liquid level detection device. This improves the response speed, adaptability, and emergency protection level of the drainage system, prevents excessive water accumulation in the cable trench, and avoids frequent pump start-stop or ineffective energy consumption.

Description

Technical Field

[0001] This invention relates to the field of auxiliary equipment technology for power systems, and more specifically to a pumping system and method for underground cable trenches in power system booster stations and substations. Background Technology

[0002] Substations and power stations have underground cable trenches containing a large number of power cables. Due to low-lying terrain or rainwater seepage during the rainy season, water can easily accumulate in these trenches. Prolonged water accumulation can reduce the insulation performance of the cables and even cause short circuits or grounding faults, seriously affecting the safe operation of power equipment.

[0003] In existing technologies, common drainage methods involve manually inspecting areas to discover accumulated water and then temporarily setting up drainage pumps to pump it out, or using simple float switches to control the pump's start and stop. Relying solely on a single water level threshold for control is insufficient to cope with sudden events such as heavy rain or a surge in seepage, easily leading to problems such as untimely drainage or frequent pump start-stops. Summary of the Invention

[0004] The purpose of this invention is to provide a pumping system and method for underground cable trenches in power system substations and booster stations, which improves the response speed and emergency response level of the drainage system, prevents excessive water accumulation in the cable trenches, and avoids frequent pump start-stop.

[0005] To achieve the above objectives, embodiments of the present invention provide a pumping system for underground cable trenches in power system substations and booster stations, including a sump well installed at the cable trench, at least two drainage pumps, a liquid level detection device, and a controller, and further including: A water level change rate detection module, connected to the controller, is used to calculate the water level rise rate in real time; The controller has a built-in multi-mode adaptive drainage strategy, which is used to select any one or a combination of energy-saving intermittent mode, normal automatic mode, forced drainage early warning mode and emergency forced mode to pump water from the cable trench based on the current water level value and water level rise rate collected by the liquid level detection device. Among them, when the current water level is lower than the first threshold and the water level rise rate is lower than the lower limit of the rate, or when the current water level reaches the pump start threshold and the water level rise rate is within the normal range, the energy-saving intermittent mode or the regular automatic mode is selected to periodically start a drainage pump for a short time. When the current water level reaches the pump start threshold and the water level rise rate exceeds the rate limit, the forced drainage warning mode is selected to start two drainage pumps simultaneously, and the superposition coefficient is adjusted according to the change in the water level rise rate. When the current water level exceeds the highest warning line or the rate of water level rise continues to exceed the upper limit for a set time, select the emergency forced mode to lock all drainage pumps to run at full speed and send an over-limit alarm to the host computer.

[0006] Optionally, the rate of water level rise can be calculated using the following formula:

[0007] In the formula, For the present The measured water level value at any given time by the liquid level detection device. for Water level value before the time, This is the preset sampling interval.

[0008] Optionally, the water collection well is also equipped with a self-cleaning, anti-clogging filter device, including: A cylindrical filter screen, the bottom of which is closed and the top of which is open, is fixed to the bottom of the water collection well; A backwash branch pipe, one end of which is connected to the outlet pipe of the drain pump, and the other end extends into the interior of the cylindrical filter screen and is equipped with a flushing nozzle; An electric switching valve, controlled by the controller, is used to introduce outlet water from the drainage pump to backwash the cylindrical filter screen within a set time after the drainage pump stops. The backwash wastewater is discharged into the bottom of the collection well through a one-way drain valve located at the bottom of the cylindrical filter screen.

[0009] Optionally, the controller is also used for: Record the historical running time, number of start-stop cycles, single continuous running time, number of failures, and current waveform characteristics of each drainage pump; and calculate the comprehensive health score of each drainage pump based on these records. Based on the comprehensive health score of each drainage pump, in automatic mode, the drainage pump with the highest comprehensive health score and the shortest cumulative running time is given priority as the main pump. When the overall health score of a drainage pump falls below the score threshold, the pump will be marked as no longer participating in drainage, and local and remote maintenance alarm information will be generated.

[0010] Optionally, calculate the overall health score for each drainage pump using the following formula:

[0011] In the formula, For life expectancy, For cumulative runtime, To allow the maximum number of start-stop operations, For the number of start-stop cycles, To allow the maximum continuous running time, The longest continuous run time in a single session. To allow the maximum number of failures, The number of failures. The allowable deviation of the starting current ratio is determined based on the characteristics of the current waveform. This is the ratio of the peak current at startup to the rated current. , , , , These are the weighting coefficients.

[0012] Optionally, the liquid level detection device includes an immersion-type liquid level transmitter and a non-contact ultrasonic liquid level gauge, respectively connected to the controller, which is further used for: The measured values ​​of the submersible level transmitter and the non-contact ultrasonic level gauge are cross-validated. When the deviation between the two exceeds the preset error range, the level detection is determined to be faulty and the system is switched to one of the following fault-tolerant modes. If only one signal is valid, the system will operate based on that signal and issue an alarm for the submersible level transmitter and the non-contact ultrasonic level gauge. If both signals fail, the system will enter a timed polling pumping mode, starting and stopping the drainage pump at fixed time intervals until the submersible level transmitter and the non-contact ultrasonic level gauge recover.

[0013] Optionally, the underground cable trench pumping system of the power system's step-up substation and substation is also equipped with a cable trench moisture-proof device, including: Sealed cable trench cover, equipped with a one-way exhaust valve; A dry air generator is connected to the inside of the cable trench via a pipe; When the drainage pump stops and the humidity in the cable trench exceeds a preset humidity threshold, the controller starts the dry air generator to fill the cable trench with dry air, so as to maintain a slight positive pressure in the cable trench and prevent external humid air from seeping in.

[0014] Optionally, a dynamic back pressure regulating valve is installed on the outlet pipe of the drainage pump and connected to the controller. When the outlet head of the drainage pump deviates from the high-efficiency zone due to changes in the length or height of the drainage pipe, the controller adjusts the opening of the dynamic back pressure regulating valve and judges the pipe blockage status by monitoring changes in the drainage pump current.

[0015] Optionally, the opening degree of the dynamic back pressure regulating valve can be calculated using the following formula:

[0016] In the formula, For the initial opening, To measure the drain pump current, Rated current, This is the proportional adjustment coefficient.

[0017] Secondly, the present invention also provides a cable trench pumping control method applied to underground cable trench pumping systems in power system substations and booster stations, comprising: The current water level in the collection well is collected in real time, and the rate of water level rise is calculated through the water level change rate detection module. Based on the current water level and the rate of water level rise, select any one or a combination of energy-saving intermittent mode, normal automatic mode, forced drainage early warning mode and emergency forced mode to pump water from the cable trench. Among them, when the current water level is lower than the first threshold and the water level rise rate is lower than the lower limit of the rate, or when the current water level reaches the pump start threshold and the water level rise rate is within the normal range, the energy-saving intermittent mode or the regular automatic mode is selected to periodically start a drainage pump for a short time. When the current water level reaches the pump start threshold and the water level rise rate exceeds the rate limit, the forced drainage warning mode is selected to start two drainage pumps simultaneously, and the superposition coefficient is adjusted according to the change in the water level rise rate. When the current water level exceeds the highest warning line or the rate of water level rise continues to exceed the upper limit for a set time, select the emergency forced mode to lock all drainage pumps to run at full speed and send an over-limit alarm to the host computer.

[0018] The above technical solutions improve the response speed, adaptability, and emergency response level of the drainage system, prevent excessive water accumulation in cable trenches, and avoid frequent pump start-ups and shutdowns or ineffective energy consumption.

[0019] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a pumping system for underground cable trenches in a power system booster station or substation, provided in an embodiment of the present invention. Figure 2 This is a flowchart illustrating the implementation of a method for controlling pumping water in underground cable trenches of power system substations and booster stations, as provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures 1. Cable trench; 2. Water collection well; 3. Drainage pump; 4. Controller. Detailed Implementation

[0022] Various embodiments of this disclosure will be described more fully in the following detailed description. This disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of this disclosure to the specific embodiments disclosed herein, but rather this disclosure should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of this disclosure.

[0023] In the following, the terms “comprising” or “may include”, which may be used in various embodiments of this disclosure, indicate the presence of the disclosed functions or operations and do not limit the addition of one or more functions or operations. Furthermore, as used in various embodiments of this disclosure, the terms “comprising,” “having,” and their cognates are intended only to indicate a specific feature, number, step, operation, or combination of the foregoing and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, or combinations of the foregoing, or the possibility of adding one or more features, numbers, steps, operations, or combinations of the foregoing.

[0024] In various embodiments of this disclosure, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] See Figure 1 The diagram shown is a structural diagram of the underground cable trench pumping system of a power system step-up substation and substation in a specific embodiment, including: This includes a water collection well 2 located at cable trench 1, at least two drainage pumps 3, a liquid level detection device and controller 4, and, A water level change rate detection module, connected to the controller 4, is used to calculate the water level rise rate in real time; The controller 4 has a built-in multi-mode adaptive drainage strategy, which is used to select any one or a combination of energy-saving intermittent mode, normal automatic mode, forced drainage early warning mode and emergency forced mode to pump water from cable trench 1 based on the current water level value and water level rise rate collected by the liquid level detection device. Specifically, when the current water level is below the first threshold and the rate of water level rise is below the lower limit of the rate, or when the current water level reaches the pump start threshold and the rate of water level rise is within the normal range, a drainage pump will be started periodically for a short period of time. When the current water level reaches the pump start threshold and the water level rise rate exceeds the rate limit, two drainage pumps are started simultaneously, and the superposition coefficient is adjusted according to the change in the water level rise rate. When the current water level exceeds the highest warning line or the rate of water level rise continues to exceed the upper limit for a set time, all drainage pumps will be locked to run at full speed and an over-limit alarm will be sent to the host computer.

[0027] Specifically, the rate of water level rise is calculated using the following formula:

[0028] In the formula, For the present The measured water level value at any given time by the liquid level detection device. for Water level value before the time, This is the preset sampling interval.

[0029] In one specific embodiment, the water collection well is further provided with a self-cleaning anti-clogging filter device, including: A cylindrical filter screen, the bottom of which is closed and the top of which is open, is fixed to the bottom of the water collection well; A backwash branch pipe, one end of which is connected to the outlet pipe of the drain pump, and the other end extends into the interior of the cylindrical filter screen and is equipped with a flushing nozzle; An electric switching valve, controlled by the controller, is used to introduce outlet water from the drainage pump to backwash the cylindrical filter screen within a set time after the drainage pump stops. The backwash wastewater is discharged into the bottom of the collection well through a one-way drain valve located at the bottom of the cylindrical filter screen.

[0030] Specifically, the controller is also used for: Record the historical running time, number of start-stop cycles, single continuous running time, number of failures, and current waveform characteristics of each drainage pump; and calculate the comprehensive health score of each drainage pump based on these records. Based on the comprehensive health score of each drainage pump, in automatic mode, the drainage pump with the highest comprehensive health score and the shortest cumulative running time is given priority as the main pump. When the overall health score of a drainage pump falls below the score threshold, the pump will be marked as no longer participating in drainage, and local and remote maintenance alarm information will be generated.

[0031] In one embodiment, the overall health score of each drainage pump is calculated according to the following formula:

[0032] In the formula, For life expectancy, For cumulative runtime, To allow the maximum number of start-stop operations, For the number of start-stop cycles, To allow the maximum continuous running time, The longest continuous run time in a single session. To allow the maximum number of failures, The number of failures. The allowable deviation of the starting current ratio is determined based on the characteristics of the current waveform. This is the ratio of the peak current at startup to the rated current. , , , , These are the weighting coefficients.

[0033] Preferably, the liquid level detection device includes an immersion-type liquid level transmitter and a non-contact ultrasonic liquid level gauge, respectively connected to a controller, the controller further being used for: The measured values ​​of the submersible level transmitter and the non-contact ultrasonic level gauge are cross-validated. When the deviation between the two exceeds the preset error range, the level detection is determined to be faulty and the system is switched to one of the following fault-tolerant modes. If only one signal is valid, the system will operate based on that signal and issue an alarm for the submersible level transmitter and the non-contact ultrasonic level gauge. If both signals fail, the system will enter a timed polling pumping mode, starting and stopping the drainage pump at fixed time intervals until the submersible level transmitter and the non-contact ultrasonic level gauge recover.

[0034] Furthermore, the underground cable trench pumping system of the power system's booster station and substation is also equipped with a cable trench moisture-proof device, including: Sealed cable trench cover, equipped with a one-way exhaust valve; A dry air generator is connected to the inside of the cable trench via a pipe; When the drainage pump stops and the humidity in the cable trench exceeds a preset humidity threshold, the controller starts the dry air generator to fill the cable trench with dry air, so as to maintain a slight positive pressure in the cable trench and prevent external humid air from seeping in.

[0035] Preferably, a dynamic back pressure regulating valve is installed on the outlet pipe of the drainage pump and connected to the controller. When the outlet head of the drainage pump deviates from the high-efficiency zone due to changes in the length or height of the drainage pipe, the controller adjusts the opening of the dynamic back pressure regulating valve and judges the pipe blockage status by monitoring changes in the drainage pump current.

[0036] Specifically, the opening degree of the dynamic back pressure regulating valve is calculated according to the following formula:

[0037] In the formula, For the initial opening, To measure the drain pump current, Rated current, This is the proportional adjustment coefficient.

[0038] Preferably, the controller is a PLC or an embedded microcontroller with a built-in multi-mode adaptive drainage strategy. The controller is also connected to a wireless communication module for sending alarm signals and operating data to the host computer.

[0039] The system can switch between four modes in real time: energy-saving intermittent, normal automatic, forced drainage warning and emergency forced, based on water level and rise rate. It can also optimize pump rotation and extend the life of the whole machine through health score, avoid equipment damage and blockage through dry operation protection and backwashing, improve pump operating efficiency through back pressure regulation, reduce the frequency of manual inspection, and prevent insulation degradation and electrical faults caused by water accumulation in cable trenches.

[0040] like Figure 2 As shown, the following are embodiments of the pumping control method for underground cable trenches of power system substations and power substations provided in this disclosure. These methods belong to the same inventive concept as the pumping systems for underground cable trenches of power system substations and power substations described in the above embodiments. For details not described in detail in the embodiments of the pumping control method for underground cable trenches of power system substations and power substations, please refer to the embodiments of the above-described pumping systems for underground cable trenches of power system substations and power substations.

[0041] Step 200: Collect the current water level value in the collection well in real time, and calculate the water level rise rate through the water level change rate detection module.

[0042] Specifically, the rate of water level rise is calculated using the following formula:

[0043] In the formula, For the present The measured water level value at any given time by the liquid level detection device. for Water level value before the time, This is the preset sampling interval.

[0044] Step 201: Based on the current water level and the rate of water level rise, select any one or a combination of the following modes: energy-saving intermittent mode, normal automatic mode, forced drainage early warning mode, and emergency forced mode to pump water from the cable trench.

[0045] Specifically, when the current water level is below the first threshold and the rate of water level rise is below the lower limit, or when the current water level reaches the pump start threshold and the rate of water level rise is within the normal range, the energy-saving intermittent mode or the regular automatic mode is selected to periodically start one drainage pump for a short period of time; when the current water level reaches the pump start threshold and the rate of water level rise exceeds the upper limit, the forced drainage warning mode is selected to start two drainage pumps simultaneously, and the superposition coefficient is adjusted according to the change in the rate of water level rise; when the current water level exceeds the highest warning line or the rate of water level rise continues to exceed the upper limit for a set time, the emergency forced mode is selected to lock all drainage pumps to full speed and send an over-limit alarm to the host computer.

[0046] For example, the conditions for selecting the energy-saving intermittent mode are: when At times, in fixed cycles Starting and stopping a drainage pump, duration of a single run satisfy ,in, To preset the low water level threshold, To preset the minimum rise rate threshold, This refers to the rated flow rate of a single drainage pump.

[0047] Conditions for selecting normal automatic mode: When At that time, start one main pump to continuously drain water until... The pump was then stopped, among which, The water level threshold for starting the pump. The water level threshold for stopping the pump. This is the preset maximum rise rate threshold.

[0048] Conditions for selecting the strong early warning mode: When At the same time, two drainage pumps are started, and the superposition factor is calculated. The actual total drainage flow is .

[0049] Conditions for selecting Emergency Forced Mode: When or The duration exceeded the preset time At that time, all drainage pumps are locked at full speed and an over-limit alarm is sent to the host computer. This is the highest warning water level threshold.

[0050] In one specific embodiment, the liquid level detection device includes an immersion liquid level transmitter and a non-contact ultrasonic liquid level gauge, which are respectively connected to a controller. The controller is further configured to: cross-verify the measured values ​​of the immersion liquid level transmitter and the non-contact ultrasonic liquid level gauge; when the deviation between the two exceeds a preset error range, determine that the liquid level detection is faulty and switch to one of the following fault-tolerant modes.

[0051] If only one signal is valid, the system will operate based on that signal and issue an alarm for the submersible level transmitter and the non-contact ultrasonic level gauge. If both signals fail, the system will enter a timed polling pumping mode, starting and stopping the drainage pump at fixed time intervals until the submersible level transmitter and the non-contact ultrasonic level gauge recover.

[0052] For example, the bias of the measured value of an immersion level transmitter and a non-contact ultrasonic level gauge is calculated according to the following formula: In the formula, The water level value is measured by an immersion level transmitter. The water level value was measured using a non-contact ultrasonic level gauge. when At that time, take .

[0053] when If a sensor malfunction is detected, the rate of change of the current value of each sensor compared to the value at the previous moment is compared, and sensor data with a reasonable rate of change are retained. The other path is marked as invalid and an alarm is issued.

[0054] When both sensors fail, the controller enters a timed polling pumping mode: pumping at fixed time intervals. Start a drainage pump and run it for a fixed period of time until any sensor resumes valid output.

[0055] In one specific embodiment, the controller also includes a dry-run protection module, which calculates the rate of change of current after the drainage pump starts. and liquid level change ,in, For the start time, This refers to the detection duration. If... and If the pump body is found to be empty or cavitated, the pump will be stopped immediately and a dry run alarm will be generated. Simultaneously, the pump will be prohibited from operating in any other manner. It will automatically restart within minutes.

[0056] In one specific embodiment, the water collection well is equipped with a self-cleaning anti-clogging filter device. The backwashing control logic of this device is as follows: after each drainage pump stops, the controller records the total drainage time. and cumulative drainage ,in, This is the average flow rate during this drainage period; when At this time, open the backwash electric switching valve, introduce pump outlet water to backwash the filter screen through the flushing nozzle, and the flushing time is [duration missing]. Close the flushing valve after flushing is complete.

[0057] In one specific embodiment, the cable trench pumping control process applied to the underground cable trench pumping system of power system step-up substations and substations is as follows: Step S1: The controller reads the water level value H(t) of the liquid level detection device at intervals of Δt (dynamically adjustable, 60 seconds when the water level is low, and 1 second when the water level is close to the pump start threshold), and calls the water level change rate detection module to calculate v(t).

[0058] Step S2: The controller compares H(t) with the preset first threshold H_low, pump start threshold H_start, and maximum warning line H_alarm; at the same time, it compares v(t) with the lower limit of rate V_min, the upper limit of rate V_max, and the duration of exceeding the set time T_over.

[0059] Step S3: Perform drainage.

[0060] like Then, it enters the energy-saving intermittent mode: the controller controls the main pump to start once every 10 minutes, run for 30 seconds and then stop, in order to discharge a small amount of seepage water and prevent the pump from getting stuck.

[0061] like Then it enters the normal automatic mode: the main pump runs continuously until... Down to Then stop.

[0062] like If the system fails to activate, it enters the forced discharge warning mode: the controller simultaneously starts the main pump and the standby pump, and adjusts the pumping mechanism according to the current situation. The ratio is used to calculate the superposition coefficient. The actual drainage flow rate is Double the rated flow rate of a single pump. When Falling back to The following and When the forced discharge mode is exited, single pump operation will resume.

[0063] like or If the emergency forced mode is activated, the controller will lock both pumps to run at full speed with rated power, send an emergency drainage alarm for exceeding the water level limit to the host computer, and flash a red light on the local display screen.

[0064] Step S4: Store all mode switching, water level data, rate data and alarm information in the controller's memory, and upload them to the host computer every 10 minutes for operation and maintenance personnel to view remotely.

[0065] Figure 3 This is a schematic diagram of the hardware structure of an electronic device that implements various embodiments of the present invention.

[0066] The pumping method for underground cable trenches in power system substations and booster stations provided in this application can be applied to electronic devices. Those skilled in the art will understand that the electronic device structures involved in the embodiments of this invention do not constitute a limitation on the electronic device. Electronic devices may include more or fewer components than illustrated, or combine certain components, or have different component arrangements. In the embodiments of this invention, electronic devices include, but are not limited to, laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic devices may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the embodiments of this application described and / or claimed herein.

[0067] Electronic devices may include processors, external memory interfaces, internal memory, universal serial bus (USB) interfaces, charging management modules, power management modules, batteries, wireless communication modules, audio modules, speakers, microphones, submersible level transmitters and non-contact ultrasonic level gauge modules, buttons, cameras, displays, and SIM card interfaces, etc.

[0068] It is understood that the structures illustrated in the embodiments of this application do not constitute a specific limitation on the electronic device. In other embodiments of this application, the electronic device may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0069] A processor may include one or more processing units, such as: a central processing unit (CPU), an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processing unit (NPU). Different processing units may be independent devices or integrated into one or more processors.

[0070] The processor can serve as the nerve center and command center of an electronic device. The controller can generate operation control signals based on the instruction opcode and timing signals to control the fetching and execution of instructions.

[0071] The processor may also include memory for storing instructions and data. In some embodiments, the memory in the processor is a cache memory. This memory can store instructions or data that the processor has just used or that are used repeatedly. If the processor needs to use the instruction or data again, it can retrieve it directly from this memory. This avoids repeated accesses, reduces processor latency, and thus improves system efficiency.

[0072] An external storage interface (ESI) can be used to connect external memory cards, such as microSD cards, to expand the storage capacity of electronic devices. The external memory card communicates with the processor through the ESI to perform data storage functions, such as saving music and video files on the external memory card.

[0073] Internal memory can be used to store computer executable program code, which includes instructions. The processor executes various functional applications and data processing of electronic devices by running the instructions stored in internal memory. Internal memory can include a program storage area and a data storage area. Internal memory can include high-speed random access memory, and can also include non-volatile memory, such as at least one disk storage device, flash memory device, universal flash storage (UFS), etc.

[0074] Wireless communication functionality in electronic devices can be achieved through antennas, wireless communication modules, modem processors, and baseband processors.

[0075] Wireless communication modules can provide solutions for wireless communication applications in electronic devices, including wireless local area networks (WLANs) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), and infrared (IR) technologies.

[0076] Electronic devices can implement audio functions through audio modules, speakers, receivers, microphones, headphone jacks, and application processors.

[0077] Electronic devices can achieve shooting functions through ISPs, cameras, video codecs, GPUs, displays, and application processors.

[0078] Electronic devices can achieve display functions through GPUs, displays, and application processors.

[0079] A GPU is a microprocessor for image processing, connected to the display screen and application processor. GPUs are used to perform mathematical and geometric calculations for graphics rendering. A processor may include one or more GPUs, which execute program instructions to generate or modify display information.

[0080] A display screen is used to display images, videos, etc. A display screen includes a display panel.

[0081] The storage medium provided in this application stores a program product capable of implementing a method for pumping water from underground cable trenches in power system substations and booster stations.

[0082] The method for pumping water from underground cable trenches in power system substations and booster stations includes: real-time acquisition of the current water level in the collection well and calculation of the water level rise rate through a water level change rate detection module; based on the current water level and the water level rise rate, selecting any one or a combination of energy-saving intermittent mode, normal automatic mode, forced drainage warning mode, and emergency forced mode to pump water from the cable trench; specifically, when the current water level is below the first threshold and the water level rise rate is below the lower limit, or when the current water level reaches the pump start threshold and the water level rise rate is within the normal range, selecting the energy-saving intermittent mode or the normal automatic mode to periodically start one drainage pump for a short period; when the current water level reaches the pump start threshold and the water level rise rate exceeds the upper limit, selecting the forced drainage warning mode to start two drainage pumps simultaneously, and adjusting the superposition coefficient according to the change in the water level rise rate; when the current water level exceeds the highest warning line or the water level rise rate continues to exceed the upper limit for a set time, selecting the emergency forced mode to lock all drainage pumps running at full speed and sending an over-limit alarm to the host computer.

[0083] In some possible implementations, the subject matter of this disclosure, namely, the method and system for pumping water from underground cable trenches of power system step-up substations and substations, can be implemented as a program product comprising program code that, when the program product is run on a terminal device, causes the terminal device to perform the steps described in the "Exemplary Methods" section of this specification according to various exemplary embodiments of this disclosure.

[0084] The storage medium disclosed herein may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0085] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power system booster station, substation underground cable trench pumping system, comprising a catch basin provided at the cable trench, at least two drainage pumps, a liquid level detection device and a controller, characterized in that, Also includes: A water level change rate detection module, connected to the controller, is used to calculate the water level rise rate in real time; The controller has a built-in multi-mode adaptive drainage strategy, which is used to select any one or a combination of energy-saving intermittent mode, normal automatic mode, forced drainage early warning mode and emergency forced mode to pump water from the cable trench based on the current water level value and water level rise rate collected by the liquid level detection device. Among them, when the current water level is lower than the first threshold and the water level rise rate is lower than the lower limit of the rate, or when the current water level reaches the pump start threshold and the water level rise rate is within the normal range, the energy-saving intermittent mode or the regular automatic mode is selected to periodically start a drainage pump for a short time. When the current water level reaches the pump start threshold and the water level rise rate exceeds the rate limit, the forced drainage warning mode is selected to start two drainage pumps simultaneously, and the superposition coefficient is adjusted according to the change in the water level rise rate. When the current water level exceeds the highest warning line or the rate of water level rise continues to exceed the upper limit for a set time, select the emergency forced mode to lock all drainage pumps to run at full speed and send an over-limit alarm to the host computer.

2. The power system booster station, substation underground cable trench pumping system of claim 1, wherein, Calculate the rate of water level rise using the following formula: In the formula, is the current instantaneous water level value of the water level detection device, is the water level value before the time, is the preset sampling interval.

3. The power system booster station, substation underground cable trench pumping system of claim 1, wherein, The water collection well is also equipped with a self-cleaning, anti-clogging filter device, including: A cylindrical filter screen, the bottom of which is closed and the top of which is open, is fixed to the bottom of the water collection well; A backwash branch pipe, one end of which is connected to the outlet pipe of the drain pump, and the other end extends into the interior of the cylindrical filter screen and is equipped with a flushing nozzle; An electric switching valve, controlled by the controller, is used to introduce outlet water from the drainage pump to backwash the cylindrical filter screen within a set time after the drainage pump stops. The backwash wastewater is discharged into the bottom of the collection well through a one-way drain valve located at the bottom of the cylindrical filter screen.

4. The power system booster station, substation underground cable trench pumping system of claim 1, wherein, The controller is also used for: Record the historical running time, number of start-stop cycles, single continuous running time, number of failures, and current waveform characteristics of each drainage pump; and calculate the comprehensive health score of each drainage pump based on these records. Based on the comprehensive health score of each drainage pump, in automatic mode, the drainage pump with the highest comprehensive health score and the shortest cumulative running time is given priority as the main pump. When the overall health score of a drainage pump falls below the score threshold, the pump will be marked as no longer participating in drainage, and local and remote maintenance alarm information will be generated.

5. The power system booster station, substation underground cable trench pumping system of claim 4, wherein, The overall health score for each drainage pump is calculated using the following formula: In the formula, is the expected life, is the cumulative running time, is the maximum number of start-stop allowed, is the number of start-stops, is the maximum continuous running time allowed, is the single longest continuous running time, is the maximum number of faults allowed, is the number of faults, is the start current ratio deviation allowed based on the current waveform characteristics, is the ratio of the current peak value at the start time to the rated current, , , , , is the weight coefficient.

6. The power system booster station, substation underground cable trench pumping system of claim 1, wherein, The liquid level detection device includes an immersion-type liquid level transmitter and a non-contact ultrasonic liquid level gauge, which are respectively connected to a controller. The controller is also used for: The measured values ​​of the submersible level transmitter and the non-contact ultrasonic level gauge are cross-validated. When the deviation between the two exceeds the preset error range, the level detection is determined to be faulty and the system is switched to one of the following fault-tolerant modes. If only one signal is valid, the system will operate based on that signal and issue an alarm for the submersible level transmitter and the non-contact ultrasonic level gauge. If both signals fail, the system will enter a timed polling pumping mode, starting and stopping the drainage pump at fixed time intervals until the submersible level transmitter and the non-contact ultrasonic level gauge recover.

7. The power system booster station, substation underground cable trench pumping system of claim 1, wherein, The underground cable trench pumping system of the power system's booster station and substation is also equipped with a cable trench moisture-proof device, including: Sealed cable trench cover, equipped with a one-way exhaust valve; A dry air generator is connected to the inside of the cable trench via a pipe; When the drainage pump stops and the humidity in the cable trench exceeds a preset humidity threshold, the controller starts the dry air generator to fill the cable trench with dry air, so as to maintain a slight positive pressure in the cable trench and prevent external humid air from seeping in.

8. The power system booster station, substation underground cable trench pumping system of claim 1, wherein, A dynamic back pressure regulating valve is installed on the outlet pipe of the drainage pump and is connected to the controller. When the outlet head of the drainage pump deviates from the high-efficiency zone due to changes in the length or height of the drainage pipe, the controller adjusts the opening of the dynamic back pressure regulating valve and judges the pipe blockage status by monitoring the changes in the drainage pump current.

9. The power system booster station, substation underground cable trench pumping system of claim 8, wherein, The opening degree of the dynamic back pressure regulating valve is calculated using the following formula: In the formula, is the initial opening, is the measured discharge pump current, is the rated current, is the proportional adjustment coefficient.

10. A cable trench pumping control method applied to the cable trench pumping system of the power system booster station, substation underground cable trench of any one of claims 1-9, characterized in that, include: The current water level in the collection well is collected in real time, and the rate of water level rise is calculated through the water level change rate detection module. Based on the current water level and the rate of water level rise, select any one or a combination of energy-saving intermittent mode, normal automatic mode, forced drainage early warning mode and emergency forced mode to pump water from the cable trench. Among them, when the current water level is lower than the first threshold and the water level rise rate is lower than the lower limit of the rate, or when the current water level reaches the pump start threshold and the water level rise rate is within the normal range, the energy-saving intermittent mode or the regular automatic mode is selected to periodically start a drainage pump for a short time. When the current water level reaches the pump start threshold and the water level rise rate exceeds the rate limit, the forced drainage warning mode is selected to start two drainage pumps simultaneously, and the superposition coefficient is adjusted according to the change in the water level rise rate. When the current water level exceeds the highest warning line or the rate of water level rise continues to exceed the upper limit for a set time, select the emergency forced mode to lock all drainage pumps to run at full speed and send an over-limit alarm to the host computer.

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