Open circuit protection device for storage battery pack of transformer substation

Abstract

The invention discloses a transformer substation storage battery pack open circuit protection device, which relates to the field of electrical maintenance and comprises a data acquisition unit, a data management unit, a protection execution unit and a result presentation unit. And the data acquisition unit is used for acquiring current, voltage, temperature and internal resistance data of the storage battery pack in real time. According to the invention, continuous monitoring and trend analysis are carried out on the parameters of the storage battery pack in the early warning stage, potential open circuit hidden dangers can be found in time, further development of faults is avoided, the influence of multiple parameters can be comprehensively considered by using a multi-stage protection strategy, and meanwhile, the influence from the external environment is considered; according to the invention, the operation state of the storage battery pack can be reflected more comprehensively and accurately, the accuracy of fault diagnosis is improved, meanwhile, the fault position can be accurately positioned, alarm signals of different levels can be identified, the severity of the fault can be quickly known, and corresponding emergency measures can be taken according to the alarm levels.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical maintenance, in particular to an open circuit protection device for a battery pack in a transformer substation. Background Art

[0002] The normal operation of a substation depends on a stable power supply. In a substation, the DC power system mainly provides power for key equipment such as control, signaling, protection and automatic devices. The battery pack is one of the core components of the DC power system. An open circuit in the battery pack will directly cause the DC power system to be unable to provide power to the load, affecting the normal operation of the substation.

[0003] For example, the “A substation battery pack open circuit protection device” with publication number CN210693533U, the substation battery pack open circuit protection device is connected to a transmission line, to which a load is also connected, wherein the transmission line includes a positive line and a negative line, and the substation battery pack open circuit protection device includes a battery unit, a DC multi-circuit switching unit and a DC voltage stabilizing unit, and the battery unit includes several battery packs connected in series.

[0004] In the existing technology, the open circuit protection device can only directly cut off the connection between the faulty battery pack and the load when an open circuit fault occurs in the battery pack. There will be some signs in the early stage of the open circuit fault, which makes it difficult to detect and predict the impending open circuit hidden dangers in a timely manner. It is impossible to take corresponding measures before the fault occurs or in the early stage, which may cause the fault range to expand and even cause a large-scale power outage. Summary of the Invention

[0005] The purpose of the present invention is to provide a substation battery pack open circuit protection device to solve the problem raised in the above background technology that it is not convenient to predict the open circuit fault in time before it occurs, and it is impossible to take corresponding measures to deal with the fault before it occurs or in the early stage, which leads to the expansion of the fault scope.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a substation battery pack open circuit protection device, comprising a data acquisition unit, a data management unit, a protection execution unit and a result presentation unit; The data acquisition unit is used to obtain the current, voltage, temperature and internal resistance data of the battery pack in real time; The data management unit is used to analyze the collected data, configure parameters, and determine the level of protection measures; The protection execution unit is used to detect early signs of open circuit and adopt different levels of protection measures; The protection execution unit includes a trend warning module and a strategy adjustment module; The trend warning module is used to analyze historical data and current data, detect whether there are early signs of open circuit, and send warning information to the monitoring end; The strategy adjustment module is used to use a multi-level protection strategy to implement different protection measures for different levels of battery packs; The result presentation unit is used to perform different sound and light alarms according to different levels of protection measures, and simultaneously locate the fault position.

[0007] Preferably, the data acquisition unit includes a current acquisition module, a voltage acquisition module, a temperature acquisition module and an internal resistance acquisition module; The current acquisition module is used to detect the current in the battery pack output circuit in real time and convert the current signal into a voltage signal proportional to the current; The voltage acquisition module is used to detect the voltage at both ends of the battery pack in real time; The temperature acquisition module is used to collect the temperature signal of the battery pack and determine the status of the battery pack; The internal resistance acquisition module injects a small AC signal into the battery, measures the voltage response and current response at both ends of the battery, and calculates the internal resistance parameters of the battery.

[0008] Preferably, the data management unit includes a data analysis module, a parameter setting module and a logic judgment module; The data analysis module is used to receive the collected data and determine the status of the battery pack through an algorithm; The parameter setting module is used to configure the alarm thresholds of current, voltage and temperature in combination with the model and capacity of the battery pack and the operating requirements of the substation; The logic judgment module is used to enable different levels of protection measures based on the judgment results of the data analysis module.

[0009] Preferably, the determining the state of the battery pack by using an algorithm comprises the following steps: S1. Collect the basic parameters of the battery pack, including voltage, current, temperature and internal resistance, and collect information on the impact of external environmental humidity, vibration and noise; S2. Use fuzzy logic to comprehensively analyze temperature, humidity, noise factors, voltage, and current parameters to determine the working status of the battery pack; S3. Perform fault diagnosis based on the fused data to eliminate temporary fluctuations in battery pack parameters caused by environmental factors and determine whether the battery has an open circuit fault.

[0010] Preferably, the strategy adjustment module includes a primary protection module, a secondary protection module and an emergency protection module; The primary protection module is used to adjust the charging and discharging process of the battery pack when the condition continues to deteriorate after the warning, reduce the overall discharge current, increase the frequency of parameter monitoring, and record the voltage difference information of each battery cell; The intermediate protection module is used to perform partial circuit isolation measures for open circuit signs that have not been improved in the primary protection stage, cutting off the series branch where the battery cell with the open circuit fault is located in the battery pack, isolating it from other normal battery cells; The emergency protection module is used to directly cut off the connection between the battery pack and the load and switch to the connection to the backup battery pack when the open circuit fault seriously threatens the safety of the substation equipment and the fault still worsens after the intermediate protection stage.

[0011] Preferably, the result presentation unit includes a fault location module and a fault alarm unit; The fault location module is used to set a detection point at each battery unit connection point, and accurately determine the fault location by comparing the voltage drop and current change of each detection point; The fault alarm unit is used to perform different modes of sound and light alarms according to different levels of measures, and send fault information at the same time to remind staff to check in time.

[0012] Preferably, it also includes an open circuit protection device, which includes a mounting mechanism, a positioning mechanism installed on one side of the mounting mechanism, the positioning mechanism including a mounting plate, one end of the mounting plate is fixedly connected to a universal joint, one end of the universal joint is fixedly connected to a positioning plate, a current sensor is installed on one side of the positioning plate, one side of the positioning plate is fixedly connected to a mounting block, both ends of the mounting block are rotatably connected to a positioning collar, a movable push plate is provided on the outside of the positioning collar, one side of the movable push plate and one end of the positioning collar are fixedly connected to a clamping block, the other side of the movable push plate is rotatably connected to a second threaded rod, and one end of the second threaded rod is threadedly connected to one side of the positioning plate.

[0013] Preferably, the mounting mechanism includes a support plate, a side of the support plate is fixedly connected to one end of the mounting plate, a temperature sensor is mounted on one side of the support plate, and a voltage sensor is mounted on the other side of the support plate.

[0014] Preferably, both ends of the support plate are fixedly connected to positioning blocks, one end of the positioning block is rotatably connected to a rotating push plate, one end of the rotating push plate is fixedly connected to a clamping plate, the other end of the rotating push plate is fixedly connected to a second guide rod, the outside of the second guide rod is slidably connected to a moving block, and one end of the moving block is rotatably connected to the rotating rod.

[0015] Preferably, one side of the support plate is threadedly connected to a first threaded rod, one end of the first threaded rod is rotatably connected to a connecting plate, one end of the connecting plate is fixedly connected to one side of the support plate, the external thread of the first threaded rod is connected to a movable plate, one end of the movable plate and one end of the support plate are both rotatably connected to one end of the rotating rod, the end of the movable plate is slidably connected to a first guide rod, one end of the first guide rod is fixedly connected to one side of the connecting plate, and the other end of the first guide rod is fixedly connected to one side of the support plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, by continuously monitoring and trending the battery pack parameters during the early warning phase, potential open circuit hazards can be discovered in a timely manner to avoid further development of faults. The use of a multi-level protection strategy can comprehensively consider the influence of multiple parameters, while also considering the influence from the external environment. It can more comprehensively and accurately reflect the operating status of the battery pack, improve the accuracy of fault diagnosis, and accurately locate the fault location, identify alarm signals of different levels, quickly understand the severity of the fault, and take corresponding emergency measures according to the alarm level.

[0017] 2. In the present invention, by rotating the first threaded rod, the movable plate is driven to move, the rotating rod connected thereto is rotated, and the rotating rod connected to the support plate is rotated synchronously, pushing one end of the rotating push plate to move, driving the two clamping plates to move, adjusting the distance between the two clamping plates, and installing the open circuit protection device on the battery, which facilitates the rapid installation and disassembly of the open circuit protection device.

[0018] 3. In the present invention, by rotating the second threaded rod, the rotatably connected movable push plate is driven to move, and the movement of the movable push plate drives the two positioning rings to rotate, thereby adjusting the position of the clamping block. The clamping block is used to clamp the outside of the output line of the battery pack, and the line is positioned, thereby improving the stability of the current sensor installed on the transmission line. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a system block diagram of a substation battery pack open circuit protection device according to the present invention; Figure 2 This is a block diagram of a strategy adjustment module of a substation battery pack open circuit protection device according to the present invention; Figure 3 This is a schematic diagram of a first three-dimensional structure of an open-circuit protection device of a substation battery pack open-circuit protection device according to the present invention; Figure 4 This is a second structural schematic diagram of an open circuit protection device of a substation battery pack open circuit protection device according to the present invention; Figure 5This is a schematic diagram of the connection structure of the positioning mechanism of the open circuit protection device for a substation battery pack of the present invention; Figure 6 This is a schematic diagram of the connection structure of a movable push plate of a substation battery pack open circuit protection device according to the present invention; Figure 7 The figure is a schematic diagram of the connection structure of the installation mechanism of the open circuit protection device of the substation battery pack of the present invention.

[0020] Figure: 1. Data acquisition unit; 11. Current acquisition module; 12. Voltage acquisition module; 13. Temperature acquisition module; 14. Internal resistance acquisition module; 2. Data management unit; 21. Data analysis module; 22. Parameter setting module; 23. Logic judgment module; 3. Protection execution unit; 31. Trend warning module; 32. Strategy adjustment module; 321. Primary protection module; 322. Intermediate protection module; 323. Emergency protection module; 4. Result presentation unit; 41. Fault location module; 42. Fault alarm unit; 5 , mounting mechanism; 51, support plate; 52, first threaded rod; 53, first guide rod; 54, movable plate; 55, connecting plate; 56, rotating rod; 57, movable block; 58, rotating push plate; 59, clamping plate; 510, positioning block; 511, second guide rod; 6, temperature sensor; 7, positioning mechanism; 71, mounting plate; 72, universal joint; 73, positioning collar; 74, movable push plate; 75, positioning plate; 76, second threaded rod; 77, mounting block; 78, clamping block; 8, current sensor; 9, voltage sensor. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] Example 1: Reference Figure 1 and Figure 2 As shown: A substation battery pack open circuit protection device includes a data acquisition unit 1, a data management unit 2, a protection execution unit 3 and a result presentation unit 4; The data acquisition unit 1 is used to obtain the current, voltage, temperature and internal resistance data of the battery pack in real time; The data acquisition unit 1 includes a current acquisition module 11, a voltage acquisition module 12, a temperature acquisition module 13 and an internal resistance acquisition module 14; The current acquisition module 11 is used to detect the current in the battery pack output circuit in real time and convert the current signal into a voltage signal proportional to it; The voltage acquisition module 12 is used to detect the voltage at both ends of the battery pack in real time; The temperature acquisition module 13 is used to collect the temperature signal of the battery pack and determine the status of the battery pack; The internal resistance acquisition module 14 injects a small AC signal into the battery, measures the voltage response and current response at both ends of the battery, and calculates the internal resistance parameters of the battery; The data acquisition unit 1 is responsible for acquiring key data of the battery pack in real time, providing basic information for subsequent analysis and processing. The current acquisition module 11 accurately monitors the discharge and charging current of the battery pack through the current sensor 8. The voltage acquisition module 12 captures subtle voltage fluctuations through the voltage sensor 9 to ensure the accuracy and real-time performance of the voltage data. The temperature acquisition module 13 is responsible for acquiring the temperature signal of the battery pack to assist in determining the overall status of the battery pack. The internal resistance acquisition module 14 obtains the internal resistance parameters of the battery by calculation to reflect the internal condition of the battery. Changes in internal resistance indicate battery aging, damage or other potential problems.

[0023] The data management unit 2 is used to analyze the collected data, configure parameters, and determine the level of protection measures; The data management unit 2 includes a data analysis module 21, a parameter setting module 22 and a logic judgment module 23; The data analysis module 21 is used to receive the collected data and determine the status of the battery pack through an algorithm; The parameter setting module 22 is used to configure the alarm thresholds of current, voltage and temperature in combination with the model and capacity of the battery pack and the operating requirements of the substation; The logic judgment module 23 is used to enable different levels of protection measures according to the judgment result of the data analysis module 21.

[0024] Determining the battery pack status through the algorithm includes the following steps: Step 1: Collect the basic parameters of the battery pack, such as voltage, current, temperature and internal resistance, and collect information on the impact of external environmental humidity, vibration and noise; Step 2: Use fuzzy logic to comprehensively analyze temperature, humidity, noise factors, voltage and current parameters to determine the working status of the battery pack; Step 3: Perform fault diagnosis based on the fused data to eliminate temporary fluctuations in battery pack parameters caused by environmental factors and determine whether the battery has an open circuit fault; Data management unit 2 is responsible for conducting in-depth analysis of the collected data, rationally configuring parameters, and accurately determining the level of protection measures. It can effectively eliminate the interference of short-term fluctuations in battery pack parameters caused by environmental factors, accurately determine whether the battery has actual problems such as open circuit faults, and improve the accuracy and reliability of fault diagnosis.

[0025] The protection execution unit 3 is used to detect early signs of open circuit and adopt different levels of protection measures; The protection execution unit 3 includes a trend warning module 31 and a strategy adjustment module 32; The trend warning module 31 is used to analyze historical data and current data, detect whether there are early signs of open circuit, and send warning information to the monitoring end; The strategy adjustment module 32 is used to use a multi-level protection strategy to implement different protection measures according to different levels of battery packs; The strategy adjustment module 32 includes a primary protection module 321 , a secondary protection module 322 and an emergency protection module 323 ; The primary protection module 321 is used to adjust the charging and discharging process of the battery pack when the condition continues to deteriorate after the warning, reduce the overall discharge current, increase the frequency of parameter monitoring, and record the voltage difference information of each battery cell; The intermediate protection module 322 is used to perform partial circuit isolation measures for open circuit signs that have not been improved in the primary protection stage, cutting off the series branch where the battery cell with the open circuit fault is located in the battery pack, isolating it from other normal battery cells; The emergency protection module 323 is used to directly cut off the connection between the battery pack and the load and switch the connection to the backup battery pack when the open circuit fault seriously threatens the safety of the substation equipment and the fault still worsens after the intermediate protection stage; The role of the protection execution unit 3 is to promptly detect early signs of open circuit and adopt different levels of protection measures according to the situation to ensure the safety of the battery pack and substation equipment. The implementation of the multi-level protection strategy reflects the hierarchical and targeted protection. From early warning monitoring to gradually upgraded protection measures, it can respond flexibly according to the development of the fault, avoiding unnecessary losses caused by over-protection and taking decisive and strong measures at critical moments to ensure equipment safety, effectively improving the safety and reliability of substation battery operation.

[0026] The result presentation unit 4 is used to perform different sound and light alarms according to different levels of protection measures, and simultaneously locate the fault position; The result presentation unit 4 includes a fault location module 41 and a fault alarm unit 42; The fault location module 41 is used to set a detection point at each battery unit connection point, and accurately determine the fault location by comparing the voltage drop and current change of each detection point; The fault alarm unit 42 is used to perform different modes of sound and light alarms according to different levels of measures, and send fault information at the same time to remind staff to check in time; The result presentation unit 4 is responsible for presenting the working results of the protection device to the operation and maintenance personnel in an intuitive and clear manner, and at the same time accurately positioning the fault location for rapid maintenance and processing. The coordinated work of the sound and light alarm and fault location provides the operation and maintenance personnel with comprehensive and timely fault information, enabling them to respond to and process the fault in the shortest possible time, effectively reducing the impact of the fault on the substation operation and ensuring the stable operation of the power system.

[0027] Example 2: Figure 3 - Figure 7 As shown, it also includes an open circuit protection device, which includes a mounting mechanism 5, a positioning mechanism 7 installed on one side of the mounting mechanism 5, the positioning mechanism 7 includes a mounting plate 71, one end of the mounting plate 71 is fixedly connected to a universal joint 72, one end of the universal joint 72 is fixedly connected to a positioning plate 75, one side of the positioning plate 75 is installed with a current sensor 8, one side of the positioning plate 75 is fixedly connected to a mounting block 77, both ends of the mounting block 77 are rotatably connected to a positioning collar 73, a movable push plate 74 is provided on the outside of the positioning collar 73, one side of the movable push plate 74 and one end of the positioning collar 73 are fixedly connected to a clamping block 78, the other side of the movable push plate 74 is rotatably connected to a second threaded rod 76, one end of the second threaded rod 76 is threadedly connected to one side of the positioning plate 75; the mounting mechanism 5 includes a support plate 51, the side of the support plate 51 is fixedly connected to one end of the mounting plate 71, one side of the support plate 51 is installed with a temperature sensor 6, and the other side of the support plate 51 is installed with a voltage sensor The first guide rod 53 is fixedly connected to the end of the first guide rod 53, and the other end of the first guide rod 53 is fixedly connected to the first guide rod 53.

[0028] In this embodiment, by rotating the first threaded rod 52, the threaded movable plate 54 is driven to move, and the movable plate 54 slides outside the first guide rod 53, so that the movable plate 54 performs linear motion. The movement of the movable plate 54 drives the rotating rod 56 connected thereto to rotate, and the movable block 57 slides outside the second guide rod 511, and rotates synchronously with the rotating rod 56 connected to the support plate 51, pushing one end of the rotating push plate 58 to move. The rotating push plate 58 rotates with the positioning block 510 as a fixed point, driving the two clamping plates 59 to move, and adjusting the distance between the two clamping plates 59. The open circuit protection device is installed on the battery, and a temperature sensor is installed on the side of the support plate 51 in contact with the battery. 6, is used to monitor the battery temperature. A voltage sensor 9 is installed on the other side of the support plate 51. The two input terminals of the voltage sensor 9 are connected to the positive and negative terminals of the battery to monitor the voltage changes of the battery. By rotating the second threaded rod 76, the movable push plate 74 connected to the rotation is driven to move. The movement of the movable push plate 74 drives the two positioning rings 73 to rotate, and the position of the clamping block 78 is adjusted. The clamping block 78 is used to clamp the outside of the output line of the battery pack to position the line, thereby improving the stability of the current sensor 8 installed on the transmission line. The current sensor 8 is installed on the outside of the line. The current sensor 8 is used to monitor the current of the line.

[0029] The usage and working principle of this device are as follows: by rotating the first threaded rod 52, the movable plate 54 is driven to move, and the movement of the movable plate 54 drives the rotating rod 56 connected thereto to rotate, and the rotating rod 56 connected to the support plate 51 rotates synchronously, pushing one end of the rotating push plate 58 to move, and driving the two clamping plates 59 to move, so that the open circuit protection device is installed on the battery, the battery temperature is monitored by the temperature sensor 6, and the battery voltage change is monitored by the voltage sensor 9, the second threaded rod 76 is rotated to drive the movable push plate 74 to move, and the two positioning rings 73 are rotated to adjust the position of the clamping block 78, and the outside of the output line of the battery pack is clamped by the clamping block 78, and the current sensor 8 is installed on the outside of the line, and the current of the line is monitored by the current sensor 8.

[0030] The present invention collects monitoring data from the temperature sensor 6, the current sensor 8, and the voltage sensor 9, combines it with information about the influence of humidity, vibration, and noise in the external environment, and uses fuzzy logic to perform a comprehensive analysis of the data to determine the operating status of the battery pack and perform open circuit fault diagnosis. In combination with the configuration of thresholds for various parameters, different levels of protection measures are applied to the open circuit fault. By analyzing the combination of historical data and current data, it is predicted whether early signs of open circuit will appear, and early warning information is sent to the monitoring end in advance. Appropriate measures are taken before the fault occurs or in the early stages to prevent further development of the fault. After detecting a fault, a multi-level protection strategy is used to implement primary, intermediate, and emergency protection measures according to the severity of the fault. At the same time, different degrees of sound and light alarms are issued according to different levels of protection measures, so that the severity of the fault can be quickly understood. By using the multi-level protection strategy, multiple parameters including current, voltage, temperature, and internal resistance can be comprehensively considered, while considering the influence of the external environment. It can more comprehensively and accurately reflect the operating status of the battery pack, improve the accuracy of fault diagnosis, enhance the ability to identify complex faults, and reduce misjudgments and missed judgments.

[0031] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A substation battery pack open circuit protection device, characterized in that: It comprises a data collection unit (1), a data management unit (2), a protection execution unit (3) and a result presentation unit (4); The data acquisition unit (1) is used to obtain the current, voltage, temperature and internal resistance data of the battery pack in real time; The data management unit (2) is used to analyze the collected data, configure parameters, and determine the level of protection measures; The protection execution unit (3) is used to detect early signs of open circuit and adopt different levels of protection measures; The protection execution unit (3) comprises a trend warning module (31) and a strategy adjustment module (32); The trend warning module (31) is used to analyze historical data and current data, detect whether there are early signs of open circuit, and send warning information to the monitoring end; The strategy adjustment module (32) is used to use a multi-level protection strategy to implement different protection measures for different levels of the battery pack; The result presentation unit (4) is used to perform different sound and light alarms according to different levels of protection measures, and simultaneously locate the fault position.

2. The open circuit protection device for a substation battery pack according to claim 1, characterized in that: The data acquisition unit (1) comprises a current acquisition module (11), a voltage acquisition module (12), a temperature acquisition module (13) and an internal resistance acquisition module (14); The current acquisition module (11) is used to detect the current magnitude in the output circuit of the battery pack in real time, and convert the current signal into a voltage signal proportional to the current; The voltage acquisition module (12) is used to detect the voltage at both ends of the battery pack in real time; The temperature acquisition module (13) is used to acquire the temperature signal of the battery pack and determine the state of the battery pack; The internal resistance acquisition module (14) injects a small AC signal into the battery to measure the voltage response and current response at both ends of the battery, thereby calculating the internal resistance parameters of the battery.

3. The open circuit protection device for a substation battery pack according to claim 2, characterized in that: The data management unit (2) comprises a data analysis module (21), a parameter setting module (22) and a logic judgment module (23); The data analysis module (21) is used to receive the collected data and determine the state of the battery pack through an algorithm; The parameter setting module (22) is used to configure the alarm thresholds of current, voltage and temperature in combination with the model and capacity of the battery pack and the operation requirements of the substation; The logic judgment module (23) is used to activate protection measures of different levels according to the judgment result of the data analysis module (21).

4. A substation battery pack open circuit protection device according to claim 3, characterized in that: Determining the state of the battery pack by using an algorithm comprises the following steps: S1. Collect the basic parameters of the battery pack, such as voltage, current, temperature and internal resistance, and collect information on the impact of external environmental humidity, vibration and noise; S2. Use fuzzy logic method to comprehensively analyze temperature, humidity, noise factors and voltage and current parameters to determine the working status of the battery pack; S3. Perform fault diagnosis based on the fused data to eliminate temporary fluctuations in battery pack parameters caused by environmental factors and determine whether the battery has an open circuit fault.

5. The open circuit protection device for a substation battery pack according to claim 4, characterized in that: The strategy adjustment module (32) includes a primary protection module (321), a secondary protection module (322) and an emergency protection module (323); The primary protection module (321) is used to adjust the charging and discharging process of the battery pack when the condition continues to deteriorate after the early warning, reduce the overall discharge current, increase the frequency of parameter monitoring, and record the voltage difference information of each battery unit; The intermediate protection module (322) is used to perform partial circuit isolation measures for the open circuit signs that have not been improved in the primary protection stage, and to cut off the series branch where the battery unit in the battery pack that is determined to have an open circuit fault is located, thereby isolating it from other normal battery units; The emergency protection module (323) is used to directly cut off the connection between the battery pack and the load and switch to the connection with the standby battery pack when the open circuit fault seriously threatens the safety of the substation equipment and the fault still worsens after the intermediate protection stage.

6. The open circuit protection device for a substation battery pack according to claim 5, characterized in that: The result presentation unit (4) comprises a fault location module (41) and a fault alarm unit (42); The fault location module (41) is used to set a detection point at each battery unit connection point, and accurately determine the fault location by comparing the voltage drop and current change of each detection point; The fault alarm unit (42) is used to perform sound and light alarms in different modes according to different levels of measures, and simultaneously send fault information to remind staff to check in time.

7. The open circuit protection device for a substation battery pack according to claim 6, characterized in that: The invention also comprises an open circuit protection device, the open circuit protection device comprising a mounting mechanism (5), a positioning mechanism (7) being mounted on one side of the mounting mechanism (5), the positioning mechanism (7) comprising a mounting plate (71), one end of the mounting plate (71) being fixedly connected to a universal joint (72), one end of the universal joint (72) being fixedly connected to a positioning plate (75), one side of the positioning plate (75) being mounted with a current sensor (8), one side of the positioning plate (75) being fixedly connected to a mounting block (77), both ends of the mounting block (77) being rotatably connected to a positioning collar (73), a movable push plate (74) being arranged on the outer side of the positioning collar (73), one side of the movable push plate (74) and one end of the positioning collar (73) being fixedly connected to a clamping block (78), the other side of the movable push plate (74) being rotatably connected to a second threaded rod (76), one end of the second threaded rod (76) being threadedly connected to one side of the positioning plate (75).

8. The open circuit protection device for a substation battery pack according to claim 7, characterized in that: The mounting mechanism (5) comprises a support plate (51), a side edge of the support plate (51) being fixedly connected to one end of a mounting plate (71), a temperature sensor (6) being mounted on one side of the support plate (51), and a voltage sensor (9) being mounted on the other side of the support plate (51).

9. The open circuit protection device for a substation battery pack according to claim 8, characterized in that: Both ends of the support plate (51) are fixedly connected with positioning blocks (510), one end of the positioning block (510) is rotatably connected with a rotating push plate (58), one end of the rotating push plate (58) is fixedly connected with a clamping plate (59), the other end of the rotating push plate (58) is fixedly connected with a second guide rod (511), the outside of the second guide rod (511) is slidably connected with a moving block (57), and one end of the moving block (57) is rotatably connected with a rotating rod (56).

10. The open circuit protection device for a substation battery pack according to claim 8, characterized in that: One side of the support plate (51) is threadedly connected to a first threaded rod (52), one end of the first threaded rod (52) is rotatably connected to a connecting plate (55), one end of the connecting plate (55) is fixedly connected to one side of the support plate (51), an external thread of the first threaded rod (52) is connected to a movable plate (54), one end of the movable plate (54) and one end of the support plate (51) are both rotatably connected to one end of a rotating rod (56), an end of the movable plate (54) is slidably connected to a first guide rod (53), one end of the first guide rod (53) is fixedly connected to one side of the connecting plate (55), and the other end of the first guide rod (53) is fixedly connected to one side of the support plate (51).

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