Switch cabinet data acquisition system and method

Abstract

The present invention relates to the technical field of switch cabinets, and specifically to a switch cabinet data acquisition system and method. The switch cabinet data acquisition system includes: a current detection module for obtaining its corresponding current. A power unit acquisition module for obtaining the theoretical power consumption of each power circuit. A calculation and analysis module for obtaining the power consumption evaluation value of the power circuit. A power curve construction module for constructing the power consumption evaluation curve of the power circuit. A judgment and analysis module for judging whether the power consumption evaluation curve is greater than a preset standard power consumption evaluation value, and if so, sending an alarm signal, and calculating the slope of the current power consumption evaluation curve. Judging whether it is greater than a preset standard variation coefficient, and if so, issuing an early warning. The present invention makes judgments through the power consumption evaluation curve, not only evaluating the situation inside the switch cabinet, but also evaluating the status of the electrical appliances on each circuit. It can also make prejudgments of the circuit to avoid major losses to the greatest extent.

Description

Technical Field

[0001] The present invention relates to the technical field of switch cabinets, and in particular to a switch cabinet data acquisition system and method. Background Art

[0002] Switchgear is a type of switching device used to switch, isolate, and control current in high-voltage power systems. It typically consists of one or more circuit breakers, allowing circuits to be operated without requiring a power outage. Switchgear is widely used in power plants, transmission lines, distribution stations, and other applications, providing a crucial guarantee for the stable operation of power systems. The main components of switchgear include: Base: Mounted on the ground, it supports the entire switchgear and enhances its stability. Compartments: Divide the interior of the switchgear into different areas to isolate and control current. Circuit breakers: Responsible for disconnecting and connecting circuits, they are the core component of the switchgear. Grounding system: Ensures the safety and reliability of the switchgear, preventing electric shock and other accidents. Sensors and actuators: Monitor and control the operating status of the switchgear, as well as enabling automation. Communication interfaces: Facilitate remote monitoring and management of the switchgear. Arc extinguishing devices: Absorb and disperse arcs to prevent them from spreading to other areas. Switchgear can be divided into various types based on voltage levels and applications, including conventional switchgear, outdoor switchgear, indoor switchgear, gas-insulated switchgear, vacuum switchgear, and SF6 gas-insulated switchgear. Each type of switchgear has its own characteristics and scope of application. Switchgear requires careful maintenance during use to ensure its reliability and safety. Regular inspection and maintenance of switchgear, as well as timely replacement of damaged parts, can effectively extend the service life of the switchgear.

[0003] Switchgear data collection is the process of comprehensively monitoring the switchgear's operating status, environmental parameters, and performance indicators. This helps promptly detect faults and optimize operations and management. Determining data collection points: First, the layout of data collection points needs to be determined based on factors such as the switchgear's installation location, operating environment, and operating requirements. Generally, data collection points should cover the entire switchgear area to comprehensively monitor all parameters. Selecting appropriate sensors: Select the appropriate sensor type based on the switchgear's operating characteristics and data collection requirements. For example, temperature sensors monitor ambient temperature, humidity sensors measure humidity, and pressure sensors measure gas pressure. Setting the data collection cycle: An appropriate data collection cycle should be established based on factors such as the switchgear's frequency of use, equipment lifespan, and maintenance requirements. Generally, switchgear with low frequency of use can have a longer data collection cycle, while switchgear with high frequency of use requires more frequent data collection. Data transmission and processing: Collected switchgear data is transmitted to the data collection and management terminal via wired or wireless communication. The data terminal is responsible for processing, storing, and issuing alarms for the collected data, and uploading abnormal data to the monitoring platform. Real-time monitoring and early warning: Through the data acquisition and management terminal, switchgear status information is displayed in real time, and alarms are issued for abnormal situations based on set thresholds and rules. This effectively prevents equipment failures and potential accidents, ensuring the safe and stable operation of the power system. Data analysis and optimization: By analyzing historical switchgear data, potential problems and hidden dangers are identified, providing a reference for equipment maintenance, replacement, and management. Targeted measures can reduce equipment failure rates and improve operational efficiency. Personnel training and equipment maintenance: Strengthen the training of operation and maintenance personnel to enable them to master the basic skills of switchgear data collection, analysis, and application. At the same time, regular equipment inspection, maintenance, and updates are carried out to ensure the stable operation of data acquisition equipment.

[0004] Existing switchgear data collection only collects internal data of the switchgear, mostly temperature collection, and then determines the switch status based on the temperature. However, the main operating body of the switchgear is the electrical appliances connected to the electrical circuit. Often, when the temperature of the switchgear changes, the appliances or circuits have already been seriously damaged. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a switch cabinet data acquisition system for collecting and detecting data on circuits and components in a switch cabinet. The switch cabinet data acquisition system includes:

[0006] The current detection module is used to detect each power circuit and obtain its corresponding current I n , where n is the sequence number of the power circuit in the switch cabinet, I n is the current in the power circuit numbered n.

[0007] The power unit acquisition module is used to collect the usage of each power circuit and obtain the theoretical power consumption P of each power circuit. n Each electrical circuit will have some electrical appliances connected in series or in parallel. We call these series or single parallel appliances electrical units.

[0008] Calculation and analysis module, used to calculate the current I n And theoretical power P n Calculate the power consumption evaluation value E of the power circuit n The power consumption evaluation value E is used to evaluate the current operating status of the power circuit. In actual operation, the power circuit will have current and voltage. Under normal operating conditions, the current and voltage are within their rated values. If they exceed this range, it indicates that the circuit is in an abnormal environment.

[0009] The electricity consumption curve building module is used to calculate the electricity consumption evaluation value E n Construct an electricity consumption evaluation curve for the electricity consumption circuit.

[0010] The judgment analysis module is used to judge whether the power consumption evaluation curve is greater than a preset standard power consumption evaluation value E 标 If yes, an alarm signal is sent, and if no, no alarm signal is sent. The alarm signal contains the information of the power circuit. In the plane coordinate system where the power evaluation curve is located, by setting the standard power evaluation value E 标 , calculate the slope E of the current electricity consumption evaluation curve n ', the slope of the current electricity consumption evaluation curve Then determine whether the slope En' is greater than a preset standard variation coefficient E n标 If yes, then issue an early warning, if no, then do not issue an early warning.

[0011] Optimum: Theoretical power consumption P of each power circuit n The obtaining method may include: collecting statistics on the current electrical appliances on each circuit, and obtaining the power consumption form of the power consumption unit on the power consumption circuit and its corresponding power p j , where j is the number of the current power unit on the circuit, p j The theoretical power consumption of the power unit numbered j is then calculated to obtain the theoretical power consumption of the power circuit. , where J is the total number of current power consumption units on the power consumption circuit, j=1, 2,…, J.

[0012] Optimum: Theoretical power consumption P of each power circuit n The acquisition method may include: theoretical power , where M标 is the standard output, M is the actual output, P 标 is the theoretical electric power corresponding to the standard output, and ε is the proportional adjustment coefficient. 标 It can be calibrated based on experience, the actual output M can be obtained through testing, and the theoretical electric power P corresponding to the standard output 标 It can be obtained by detection, and the proportional adjustment coefficient ε can be obtained through experience. The general value is 0.9-1.1. It can be a fixed value or a variable value that changes with the value. The details are not repeated here.

[0013] Preferably: the electricity consumption evaluation value .

[0014] Preferably: the electricity consumption evaluation value .

[0015] Preferably: the electricity consumption evaluation value , where U n The voltage of the power circuit.

[0016] Preferably, the method for constructing the electricity consumption evaluation curve includes: constructing a plane coordinate system, with the horizontal axis representing each time point within the working time period and the vertical axis representing the numerical value. Then, the calculated electricity evaluation values ​​are implanted into the corresponding coordinate system according to the time point, and then connected in chronological order to obtain the electricity consumption evaluation curve.

[0017] Preferably: In order to improve the alarm capability, the standard electricity evaluation value E 标 It is a multi-level step alarm mode.

[0018] Preferably, the multi-step alarm mode is a three-step alarm mode.

[0019] Preferred: E 标 Including E 标 1 、E 标 2 and E 标 3 , and E 标 1 <E 标 2 <E 标 3 , which will form three step threshold lines. When the electricity consumption evaluation curve is lower than E 标 1 , then no alarm is given. When E 标 1 ≤E n <E 标 2, a first-level alarm is issued, which can notify maintenance personnel to conduct inspections. 标 2 ≤E n <E 标 3 , a secondary alarm is issued, which can notify maintenance personnel to conduct an expedited inspection. 标 3 ≤E n , a three-level alarm is issued, and the switches of the power circuits ranked n are controlled to be on and off.

[0020] Preferably: the standard electricity evaluation value , where l and k are the numbers of the interference evaluation factors, K is the total number of interference evaluation factors, l, k = 1, 2, ..., K; ɑ k and ɑ l It is the interference evaluation factor value corresponding to the interference evaluation factors numbered k and l.

[0021] Preferably, the interference evaluation factors may include but are not limited to voltage interference factors, circuit damage interference factors, and power unit interference factors.

[0022] The present invention also provides a switch cabinet data acquisition method, comprising the following steps:

[0023] S1. Detect each power circuit and obtain its corresponding current I n , where n is the sequence number of the power circuit in the switchgear.

[0024] S2. Obtain the theoretical power P of each power circuit n .

[0025] S3, according to the current I n And theoretical power P n Calculate the power consumption evaluation value E of the power circuit n .

[0026] S4. Based on the electricity consumption evaluation value E n Construct an electricity consumption evaluation curve for the electricity consumption circuit.

[0027] S5. Determine whether the electricity consumption evaluation curve is greater than a preset standard electricity consumption evaluation value E. 标 If yes, an alarm signal is sent; if no, no alarm signal is sent.

[0028] S6. Calculate the slope E of the current electricity consumption evaluation curve n '.

[0029] S7. Determine whether the slope En' is greater than a preset standard variation coefficient E. n标If yes, then issue an early warning, if no, then do not issue an early warning.

[0030] The technical effects and advantages of the present invention are as follows: By forming a threshold straight line in a plane coordinate system, when the power consumption evaluation curve exceeds this line, it indicates that the power circuit is experiencing severe losses, with a significant deviation in the ratio between the actual power output and the effective power. This not only results in significant energy waste, but also generates significant heat, wear, or equipment malfunction, shortening or damaging the equipment lifespan. Conventional insurance measures rely solely on current flow, which can only determine the load on the circuit, not the operating status of individual appliances. The present invention can evaluate based on the power consumption evaluation value within the circuit, not only assessing the conditions within the switchgear but also the status of appliances on each circuit, providing strong evaluation capabilities. Displaying the information using linear coordinates provides intuitive visualization. By determining the slope, the power circuit's losses can be determined. Typically, problems with power circuits or power units do not immediately cause damage to the equipment or circuit. Such damage only manifests itself when the damage reaches a threshold, but by then the equipment or circuit is already severely damaged. By judging the slope, the circuit can be predicted and the deterioration trend of the circuit can be revealed at the first time. It can be discovered in time and the damage can be nipped in the bud to avoid damage to equipment or circuits and minimize major losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural block diagram of a switch cabinet data acquisition system proposed by the present invention.

[0032] Figure 2 The figure is a flow chart of a switch cabinet data acquisition method proposed by the present invention.

[0033] Figure 3 This is a flow chart of a method for constructing an electricity consumption evaluation curve in a switch cabinet data acquisition system proposed by the present invention. DETAILED DESCRIPTION

[0034] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described to better illustrate the principles of the invention and its practical application, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for specific applications.

[0035] Example 1 Reference Figure 1In this embodiment, a switch cabinet data acquisition system is proposed for collecting and detecting data on circuits and components in a switch cabinet. The switch cabinet data acquisition system includes:

[0036] The current detection module is used to detect each power circuit and obtain its corresponding current I n , where n is the sequence number of the power circuit in the switch cabinet, I n The current in the power circuit numbered n is the current. A switchgear is a complete set of switchgear and control equipment. It serves as a power center and main distribution device, primarily for switching operations. In a typical application scenario, there are many electrical appliances and / or units. Each appliance and / or unit corresponds to a power circuit, which is integrated within the switchgear and connected to the switchgear or control equipment. Therefore, each power circuit is connected to one or more appliances and / or units. We need to monitor each circuit to obtain the corresponding current, so we need to install current measurement equipment on each circuit. There are various methods for measuring current, which can be categorized as direct or indirect. The direct method calculates current by measuring the magnetic field or potential generated by the current. This method measures current directly without further processing of voltage or other related parameters. Key measurement methods include Hall effect sensors and ammeters. Hall effect sensors utilize the interaction between the magnetic field generated by current passing through a conductor and the Hall resistance to generate a voltage. This voltage is then measured to determine the current. Hall effect sensors offer advantages such as fast response speed and high accuracy. Amperemeters, also known as magnetic flow sensors, calculate current by measuring changes in the magnetic field near a conductor caused by current flow. Amperemeters have advantages such as strong anti-interference capabilities and a compact size. Indirect methods calculate current by measuring changes in physical quantities caused by current flow. This method requires understanding the effect of current on a specific parameter, then measuring that parameter to determine the current value. Electromagnetic induction methods: According to Faraday's law of electromagnetic induction, when a conductor cuts through magnetic flux lines, an electromotive force (EMF) is generated within the conductor. By measuring the magnitude of this EMF, the current can be calculated. Hysteresis methods: Utilizing the hysteresis of the magnetic field around a conductor when current flows through it, the area or length of the hysteresis loop is measured to determine the current. This method is suitable for high current applications. Transformers: The magnetic field generated by current in the transformer's primary winding acts on the secondary winding, generating an EMF. Measuring this EMF allows the current to be calculated. Transformers are widely used in high-precision current measurement applications.

[0037] The power unit acquisition module is used to collect the usage of each power circuit and obtain the theoretical power consumption P of each power circuit. nEach power circuit will have some electrical appliances connected in series or in parallel. We call these series or single parallel appliances power units. In actual work, electrical appliances are mainly connected in parallel. If they are connected in series, the appliances in the entire series circuit can be regarded as a power unit for calculation. The details will not be elaborated here. The theoretical power consumption P of each power circuit n The acquisition method may include the following: collecting statistics on the current electrical appliances on each circuit, and obtaining the power consumption form and corresponding power p of the power consumption unit on the power consumption circuit. j , where j is the number of the current power unit on the circuit, p j The theoretical power consumption of the power unit numbered j is then calculated to obtain the theoretical power consumption of the power circuit. , where J is the total number of current power consumption units on the power circuit, j=1, 2, ..., J. In the actual working process, each power consumption unit has its own operating state, and each operating state corresponds to its electric power p j This does not require real-time detection and can be obtained through pre-tests or equipment parameters. It is only necessary to know the operating status of the equipment. The operating status can be obtained in real time through the current status of the power unit. Specifically, the control center of the power unit can be connected to the power unit acquisition module to obtain the status data in real time. Then, according to the status data, a pre-prepared state-electric power information table is searched to obtain the electric power of each power device. For example, in actual work, there is a boiler on an electric circuit in a chemical plant. The boiler has three states: heating, insulation, and cooling. The power of the three states is 1×10 5 W, 1×10 3 W and 1×10 4 W, we can prepare the state-power information table in advance based on the power corresponding to the state of the equipment. By monitoring the power circuit, we can obtain that the state of the boiler is insulation at this time, and the power obtained by looking up the table is 1×10 3 W. This circuit has only one electrical appliance, so the theoretical power consumption of this circuit is 1×10 3 W. Of course, it can be obtained by other methods, which will not be described in detail here. Of course, there are also some operating modes that are calculated based on power output, specifically theoretical power consumption. , where M 标 is the standard output, M is the actual output, P 标 is the theoretical electric power corresponding to the standard output, and ε is the proportional adjustment coefficient. 标 It can be calibrated based on experience, the actual output M can be obtained through testing, and the theoretical electric power P corresponding to the standard output 标It can be detected and obtained. The proportional adjustment coefficient ε can be obtained through experience. The general value is 0.9-1.1. It can be a fixed value or a variable value that changes with the value. The specific details are not described here. For example, to calculate the theoretical output of a motor, the output at this time needs to be evaluated based on the output speed. We assume that the output torque is the same under a working environment and do not consider it here. The standard output torque of this motor M 标 The actual output speed M is 4000rpm, and the actual output speed M is 3500rpm. At this time, the theoretical electric power corresponding to the standard output is 12KW, and the proportional adjustment coefficient is 0.95. Then we calculate the theoretical electric power =9.975KW. Of course, this is just a simple example and is not universal. Other cases will not be elaborated here.

[0038] Calculation and analysis module, used to calculate the current I n And theoretical power P n Calculate the power consumption evaluation value E of the power circuit n The power consumption evaluation value E is used to evaluate the working state of the current power circuit. In the actual working process, the power circuit will have current and voltage. In a normal working environment, the current and voltage are within their rated values. When it exceeds this range, it proves that the circuit is in an abnormal environment. , of course, does not exclude other calculation methods, such as ,or , U n It is the voltage of the power circuit, and the details are not described here. The power evaluation value and the voltage or the inverse of the voltage are not the same concept. The power evaluation value is calculated by the theoretical power consumption and the actual current. What is calculated is a power consumption state, not a voltage value. The power evaluation value can reflect the state of electric energy operation, which is a state relationship between theoretical and actual power consumption. The power evaluation value can only calculate the numerical value without considering the unit. It is a dimensionless value. Of course, the attached unit can also be evaluated. The details are not described here. For example, when a power circuit is working, its theoretical power consumption is 1×10 3 W. By detecting that the current of the circuit is 5A, we can obtain the power consumption evaluation value by calculation =5 / 1000=0.005. Of course, this is just a simple example calculation and is not universally applicable, so I won't go into detail here. To facilitate identification and subsequent calculations, the calculated electricity consumption evaluation value can be amplified to facilitate identification, but I won't go into detail here.

[0039] The electricity consumption curve building module is used to calculate the electricity consumption evaluation value E nConstruct the power consumption evaluation curve of the power circuit. Figure 3 The method for constructing the electricity consumption evaluation curve includes: constructing a plane coordinate system, the horizontal axis is each time point in the working time period, and the vertical axis is a numerical value. Then the calculated electricity evaluation value is implanted into the corresponding coordinate system according to the time point, and then connected in sequence in chronological order, so that the electricity consumption evaluation curve can be obtained. The electricity consumption evaluation curve can reflect the electricity consumption status of each power circuit, and at the same time, it can reflect the electricity consumption status of each power circuit that changes with time. There is no need to consider the increase or decrease of electrical appliances on the power circuit. It has a wide range of applications and low interference. The working time period can be analyzed according to actual conditions. Generally, the working time period can be one day, two hours, one hour, etc., and can be set according to actual needs.

[0040] The judgment analysis module is used to judge whether the power consumption evaluation curve is greater than a preset standard power consumption evaluation value E 标 If yes, an alarm signal is sent, and the alarm signal contains the information of the power circuit. In the plane coordinate system where the power evaluation curve is located, by setting the standard power evaluation value E 标 , forming a threshold straight line in the plane coordinate system. When the electricity consumption evaluation curve exceeds this straight line, it means that the loss of the power circuit is serious, and there is a serious deviation in the ratio between the actual power output of the loss and the effective electric power. At this time, not only a large amount of energy will be wasted, but the lost electric energy will also generate a large amount of heat, wear or abnormal operation of the equipment, etc., which will cause the life of the equipment to be shortened or damaged. The general insurance measures are only judged by the current. The current judgment can only determine the load condition of the circuit, and cannot determine the working status of each electrical appliance. The present invention can be evaluated based on the electricity consumption evaluation value in the circuit. It not only evaluates the situation in the switch cabinet, but also evaluates the status of the electrical appliances on each circuit, and has a strong evaluation capability. In order to improve the alarm capability, the standard electricity consumption evaluation value E can be used. 标 It is divided into multiple levels of alarm mode. Generally, it is divided into three levels for alarm. 标 Including E 标 1 、E 标 2 and E 标 3 , and E 标 1 <E 标 2 <E 标 3 , which will form three step threshold lines. When the electricity consumption evaluation curve is lower than E 标 1 , then no alarm is given. When E 标 1 ≤En <E 标 2 , a first-level alarm is issued, which can notify maintenance personnel to conduct inspections. 标 2 ≤E n <E 标 3 , a secondary alarm is issued, which can notify maintenance personnel to conduct an expedited inspection. 标 3 ≤E n , a three-level alarm is issued, and the switch of the power circuit ranked n is opened and closed. The specific design needs to be based on the actual situation, and the specific values ​​are not described here. The standard power evaluation value E 标 It can be designed based on actual needs or experience, and of course it can also be obtained through calculation, as follows: Standard electricity evaluation value , where l and k are the numbers of the interference evaluation factors, K is the total number of interference evaluation factors, l, k = 1, 2, ..., K; ɑ k and ɑ l It is the interference evaluation factor value corresponding to the interference evaluation factors numbered k and l. The interference evaluation factors may include but are not limited to voltage interference factors, circuit damage interference factors, and power unit interference factors. Its specific value can be set and calculated according to the situation. The value of the voltage interference factor needs to be determined according to the actual voltage used. It is generally 220, and of course other voltage operations are not excluded. The value of the circuit damage interference factor needs to be designed according to the tolerance of the circuit. Generally, a circuit-interference factor information table can be made in advance according to the power circuit situation, and then obtained by looking up the table. Its value is generally 500-1000. The information table and the value setting are not the subject of protection of this application, and the specific content will not be repeated here. The value of the power unit interference factor needs to take into account the performance of the electrical appliances used, and can also be obtained by looking up the table. Its value is generally 500-1000, and the specific details will not be repeated here. This method can be used to evaluate the entire circuit. The setting of the standard power consumption evaluation value takes into account the influence of voltage, circuit and power unit performance. The calculation is accurate and fits the reality, and it has strong applicability and a wide range. For example, in actual work, when calculating a boiler, its working voltage is 220V. We get the voltage interference factor as 220. We analyze the circuit situation to get the circuit data, and then look up the table to get the value of 600. We analyze the boiler situation to get the electrical data, and then look up the table to get the value of 800. Then we calculate =(600×800+220×600+220×800) / (220×600×800)=0.0075. Of course, this is just a simple example and is not necessarily universal. The details will not be elaborated here. After receiving the alarm signal, the circuit can be directly powered off, or a maintenance signal can be sent to the staff for inspection. The various electrical appliances on the circuit can be checked and countermeasures can be taken in time to avoid serious losses caused by damage to the equipment or circuit. Calculate the slope E of the current power consumption evaluation curve n ', the slope of the current electricity consumption evaluation curve Then determine whether the slope En' is greater than a preset standard variation coefficient E n标 ', if yes, then an early warning will be issued, if not, then no early warning will be issued. By judging the slope, the loss of the power circuit can be judged. When a problem occurs in a general power circuit or power unit, it will not immediately cause damage to the equipment or circuit. When the degree of damage reaches the threshold, the damage will be manifested, but at this time the equipment or circuit has been severely damaged. By judging the slope, it can be manifested at the first time when the circuit shows a deterioration trend, and it can be discovered in time, and the damage can be nipped in the bud to avoid damage to the equipment or circuit, and to avoid major losses to the greatest extent. The standard variation coefficient E n标 'It can be determined based on actual conditions or experience, generally ranging from 0.05-0.3. Of course, it can also be set as a gradient judgment. Generally, three gradients are set to provide different degrees of warning prompts. The details are not detailed here.

[0041] Example 2 Reference Figure 2 The present invention also proposes a switch cabinet data acquisition method, comprising the following steps:

[0042] S1. Detect each power circuit and obtain its corresponding current I n , where n is the sequence number of the power circuit in the switchgear.

[0043] S2. Obtain the theoretical power P of each power circuit n .

[0044] S3, according to the current I n And theoretical power P n Calculate the power consumption evaluation value E of the power circuit n .

[0045] S4. Based on the electricity consumption evaluation value E n Construct an electricity consumption evaluation curve for the electricity consumption circuit.

[0046] S5. Determine whether the electricity consumption evaluation curve is greater than a preset standard electricity consumption evaluation value E. 标 If yes, an alarm signal is sent; if no, no alarm signal is sent.

[0047] S6. Calculate the slope E of the current electricity consumption evaluation curve n '.

[0048] S7. Determine whether the slope En' is greater than a preset standard variation coefficient E. n标 If yes, then issue an early warning, if no, then do not issue an early warning.

[0049] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making creative efforts should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. A switch cabinet data acquisition system, characterized in that: The switch cabinet data acquisition system includes: The current detection module is used to detect each power circuit and obtain its corresponding current I n , where n is the sequence number of the power circuit in the switchgear; The power unit acquisition module is used to obtain the theoretical power consumption P of each power circuit. n , the theoretical power consumption P of each power circuit n The acquisition method includes: collecting statistics on the current electrical appliances on each circuit, obtaining the power consumption form of the power consumption unit on the power consumption circuit and its corresponding power p j , where j is the number of the current power unit on the circuit, p j is the theoretical power of the power unit numbered j; then the theoretical power of the power circuit is calculated , where J is the total number of current power consumption units on the power consumption circuit, j=1, 2, ..., J; The calculation and analysis module is used to calculate the current I n And theoretical power P n Calculate the power consumption evaluation value E of the power circuit n ; The electricity consumption curve construction module is used to calculate the electricity consumption evaluation value E n Constructing an electricity consumption evaluation curve for the electricity consumption circuit; The judgment analysis module is used to judge whether the electricity consumption evaluation curve is greater than a preset standard electricity consumption evaluation value E 标 If yes, an alarm signal is sent, if no, no alarm signal is sent; calculate the slope E of the current electricity consumption evaluation curve n '; Determine whether the slope En' is greater than a preset standard variation coefficient E n标 ', if yes, then give an early warning, if no, then do not give an early warning; the electricity consumption evaluation value is 、 or , where U n is the voltage of the power circuit; Switchgear data collection methods include: S1. Detect each power circuit and obtain its corresponding current I n , where n is the sequence number of the power circuit in the switchgear; S2. Obtain the theoretical power P of each power circuit n ; S3, according to the current I n And theoretical power P n Calculate the power consumption evaluation value E of the power circuit n ; S4. Based on the electricity consumption evaluation value E n Constructing an electricity consumption evaluation curve for the electricity consumption circuit; S5. Determine whether the electricity consumption evaluation curve is greater than a preset standard electricity consumption evaluation value E. 标 , if yes, then send an alarm signal, if no, then do not send an alarm signal; S6. Calculate the slope E of the current electricity consumption evaluation curve n '; S7. Determine whether the slope En' is greater than a preset standard variation coefficient E. n标 If yes, then issue an early warning, if no, then do not issue an early warning.

2. A switch cabinet data acquisition system according to claim 1, characterized in that: The method for constructing the electricity consumption evaluation curve includes: constructing a plane coordinate system, the horizontal axis is each time point in the working time period, and the vertical axis is the electricity consumption evaluation value, implanting the calculated electricity consumption evaluation value into the corresponding coordinate system according to the time point, and then connecting them in sequence in chronological order to obtain the electricity consumption evaluation curve.

3. A switch cabinet data acquisition system according to claim 1, characterized in that: Standard electricity consumption evaluation value E 标 It is a multi-level step alarm mode.

4. A switch cabinet data acquisition system according to claim 3, characterized in that: The multi-level step alarm mode is a three-step alarm mode.

5. A switch cabinet data acquisition system according to claim 4, characterized in that: The E 标 Including E 标 1 、E 标 2 and E 标 3 , and E 标 1 <E 标 2 <E 标 3 , thus forming three step threshold lines. When the electricity consumption evaluation curve is lower than E 标 1 , then no alarm is given. When E 标 1 ≤E n <E 标 2 , a first-level alarm is issued; when E 标 2 ≤E n <E 标 3 , a secondary alarm is issued; when E 标 3 ≤E n , and issue a third-level alarm.

6. A switch cabinet data acquisition system according to claim 5, characterized in that: Level 1 alarm notifies maintenance personnel to conduct an inspection; level 2 alarm notifies maintenance personnel to conduct an expedited inspection; level 3 alarm controls the opening and closing of the power circuit switches ranked n.

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