Switch cabinet data acquisition system and method

Abstract

The invention relates to the technical field of switch cabinets, in particular to a switch cabinet data acquisition system and method. The switch cabinet data acquisition system comprises a current detection module used for obtaining corresponding current. The power utilization unit acquisition module is used for acquiring theoretical power utilization power of each power utilization circuit. And the calculation and analysis module is used for obtaining an electricity utilization evaluation value of the electricity utilization circuit. The electricity utilization curve construction module is used for constructing an electricity utilization evaluation curve of the electricity utilization circuit. The judgment and analysis module is used for judging whether the electricity utilization evaluation curve is larger than a preset standard electricity utilization evaluation value or not, if yes, an alarm signal is sent, and the slope of the current electricity utilization evaluation curve is obtained through calculation. And judging whether the change coefficient is greater than a preset standard change coefficient, and if so, performing early warning. According to the method, judgment is carried out through the electricity utilization evaluation curve, the situation in the switch cabinet is evaluated, and the state of the electric appliance on each circuit can also be evaluated. And the circuit can be pre-judged, so that heavy loss is avoided 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 switching device used for current switching, isolation and control in high-voltage power systems. It usually consists of one or more circuit breakers, which can operate the circuit without power outage. Switchgear is widely used in power plants, transmission lines, distribution stations and other occasions, providing important guarantee for the stable operation of power systems. The main components of the switchgear include: Base: installed on the ground, used to support the entire switchgear and improve its stability. Compartment: divides the inside of the switchgear into different areas to achieve functions such as current isolation and control. Circuit breaker: responsible for cutting off and connecting the circuit, which is the core part of the switchgear. Grounding system: used to ensure the safety and reliability of the switchgear, prevent electric shock and other accidents. Sensors and actuators: used to monitor and control the working status of the switchgear, as well as to realize the function of automation. Communication interface: convenient for remote monitoring and management of the switchgear. Arc extinguishing device: used to absorb and disperse the arc to prevent the arc from spreading to other areas. According to the voltage level and purpose, switchgear can be divided into many types, such as conventional switchgear, outdoor switchgear, indoor switchgear, gas insulated switchgear, vacuum switchgear, SF6 gas insulated switchgear, etc. Each type of switchgear has its own characteristics and scope of application. The switchgear needs to be maintained and maintained during use to ensure its reliability and safety. Regular inspection and maintenance of the switchgear and timely replacement of damaged parts can effectively extend the service life of the switchgear.

[0003] Switchgear data collection is a process of comprehensive monitoring of the operating status, environmental parameters and working indicators of the switchgear, which helps to timely detect faults, optimize operation and management. Determine the data collection points: First, it is necessary to determine the layout of the data collection points based on factors such as the installation location, use environment and operation requirements of the switchgear. Generally speaking, the data collection points should cover the entire switchgear area so as to comprehensively monitor the various parameters of the switchgear. Select the appropriate sensor: Select the appropriate sensor type according to the working characteristics of the switchgear and the data collection requirements. For example, the temperature sensor is used to monitor the ambient temperature, the humidity sensor is used to detect the ambient humidity, and the air pressure sensor is used to measure the gas pressure. Set the data collection cycle: According to the frequency of use of the switchgear, the equipment life and the maintenance requirements, formulate a suitable data collection cycle. Generally speaking, the switchgear with low frequency of use can extend the data collection cycle, while the switchgear with high frequency of use needs to collect data frequently. Data transmission and processing: The collected switchgear data is transmitted to the data collection and management terminal through wired or wireless communication. The data terminal is responsible for processing, storing, alarming and other functions of the collected data, and uploading abnormal data to the monitoring platform. Real-time monitoring and early warning: Through the data acquisition and management terminal, the status information of the switch cabinet is displayed in real time, and alarms are issued for abnormal situations according to the set thresholds and rules. This can effectively prevent equipment failures and potential accidents and ensure the safe and stable operation of the power system. Data analysis and optimization: Through the analysis of the historical data of the switch cabinet, potential problems and hidden dangers can be found to provide a reference for equipment maintenance, replacement and management. Targeted measures can reduce the equipment failure rate and improve operating efficiency. Personnel training and equipment maintenance: Strengthen the training of operation and maintenance personnel so that they can master the basic skills of switch cabinet data collection, analysis and application. At the same time, regularly inspect, maintain and update the equipment to ensure the stable operation of the data acquisition equipment.

[0004] The existing data collection of switch cabinets only collects the internal data of the switch cabinet, mostly temperature collection, and then determines the switch status by the temperature. However, the main operating body of the switch cabinet is the electrical appliances connected to the electrical circuit. Often when the temperature of the switch cabinet changes, the electrical appliances or circuits have been seriously damaged. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a switch cabinet data acquisition system for collecting and detecting data of circuits and components in the switch cabinet. The switch cabinet data acquisition system comprises: 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 electrical circuit numbered n.

[0006] 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.

[0007] The calculation and analysis module is used to calculate the current I n And theoretical power consumption 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.

[0008] The electricity consumption curve building module is used to calculate the power consumption curve according to the electricity consumption evaluation value E. n Construct an electricity consumption evaluation curve for the electricity circuit.

[0009] The judgment and 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, if no, no alarm signal is sent. The alarm signal contains information about 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 a warning, if no, then do not issue a warning.

[0010] 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 and corresponding electric 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 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.

[0011] Optimum: Theoretical power consumption P of each power circuit n The acquisition method may include: theoretical power consumption , where M 标is the standard output, M is the actual output, P is 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 detection, and the theoretical electric power P corresponding to the standard output 标 It can be detected and obtained, 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.

[0012] Preferably: the electricity consumption evaluation value .

[0013] Preferably: the electricity consumption evaluation value .

[0014] Preferably: the electricity consumption evaluation value , where U n The voltage of the power circuit.

[0015] Preferably, the method for constructing the power 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 value. Then the calculated power evaluation value is implanted into the corresponding coordinate system according to the time point, and then connected in sequence according to the time sequence, so as to obtain the power consumption evaluation curve.

[0016] Preferred: In order to improve the alarm capability, the standard electricity evaluation value E 标 It is a multi-level step alarm mode.

[0017] Preferably: the multi-step alarm mode is a three-step alarm mode.

[0018] 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 , 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 inspection.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 opening and closing of the power circuit switches ranked n are controlled.

[0019] Preferably: the standard electricity rating value , where l, 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 l It is the interference evaluation factor value corresponding to the interference evaluation factors numbered k and l.

[0020] Preferably, the interference evaluation factors may include but are not limited to voltage interference factors, circuit damage interference factors, and power consumption unit interference factors.

[0021] The present invention also provides a switch cabinet data acquisition method, comprising the following steps: 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.

[0022] S2. Obtain the theoretical power consumption P of each power circuit n .

[0023] S3, according to the current I n And theoretical power consumption P n Calculate the power consumption evaluation value E of the power circuit n .

[0024] S4. Based on the electricity consumption evaluation value E n Construct an electricity consumption evaluation curve for the electricity circuit.

[0025] 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.

[0026] S6. Calculate the slope E of the current electricity consumption evaluation curve n '.

[0027] S7, determine whether the slope En' is greater than a preset standard variation coefficient E n标 ', if yes, then issue a warning, if no, then do not issue a warning.

[0028] The technical effects and advantages of the present invention are as follows: the present invention forms a threshold straight line in a plane coordinate system. When the power consumption evaluation curve exceeds this straight line, it indicates that the power consumption circuit has serious losses, and the ratio between the actual power output and the effective power has serious deviations. At this time, not only a large amount of energy waste will be generated, but also a large amount of heat, wear or abnormal operation of the equipment will be generated, resulting in a reduction in the life of the equipment or damage. In general, the insurance measures are only judged by the current, and the current judgment can only determine the load of the circuit, and cannot determine the working state of each electrical appliance. The present invention can be evaluated according to the power consumption evaluation value in the circuit, not only the situation in the switch cabinet, but also the state of the electrical appliances on each circuit, and the evaluation ability is strong. Display is made by linear coordinates, and the display is intuitive. By judging the slope, the loss of the power consumption circuit can be judged. When a problem occurs in a general power consumption circuit and a power consumption unit, it will not cause damage to the equipment or circuit in the first time. When the degree of damage reaches the threshold, the damage will be manifested, but at this time the equipment or circuit has been seriously damaged. By judging the slope, the circuit can be predicted. If the circuit shows a deterioration trend, it can be discovered in time and the damage can be nipped in the bud to avoid damage to the equipment or circuit, thus avoiding major losses to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural block diagram of a switch cabinet data acquisition system proposed by the present invention.

[0030] Figure 2 The present invention is a flow chart of a switch cabinet data acquisition method.

[0031] 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

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0033] Example 1 Reference Figure 1 In this embodiment, a switch cabinet data acquisition system is proposed, which is used to collect and detect data on circuits and components in the switch cabinet. 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 switch cabinet, I n is the current of the power circuit numbered n. The switchgear is a set of switchgear and control equipment. It serves as a power center and main distribution device and mainly plays the role of opening and closing. In the use scenario, there will be many electrical appliances and / or power units. Each electrical appliance and / or power unit will correspond to a power circuit. These power circuits will be gathered in the switchgear and connected to the switchgear or control equipment. Therefore, each power circuit will be connected to one or more electrical appliances and / or power units. We need to detect each power circuit to obtain the corresponding current. Therefore, it is necessary to install equipment for detecting current on each power circuit. There are many ways to obtain current, which can be divided into direct method and indirect method. The direct method is to calculate the current by measuring the magnetic field or potential generated by the current. This method directly measures the current without additional processing of voltage or other related parameters. Its main measurement methods include: Hall effect sensor and ammeter. Hall effect sensor: The magnetic field generated when the current passes through the wire interacts with the Hall resistance to generate voltage, and then the current is determined by measuring this voltage. Hall effect sensor has the advantages of fast response speed and high accuracy. Ammeter: Also known as magnetic flow velocity sensor, it calculates the current by measuring the change of magnetic field near the wire excited by the current. Ammeter has the advantages of strong anti-interference ability and small size. Indirect method: The indirect method calculates the current by measuring the change of physical quantity caused by the flow of current. This method requires first understanding the influence of current on a certain parameter, and then obtaining the current value by measuring the parameter. Electromagnetic induction method: According to Faraday's law of electromagnetic induction, when a conductor cuts the magnetic flux lines and moves, an electromotive force will be generated in the conductor. By measuring the magnitude of this electromotive force, the magnitude of the current can be calculated. Hysteresis effect method: When the current passes through the wire, the hysteresis phenomenon of the magnetic field around the wire is used to measure the area or length of the hysteresis loop to obtain the current magnitude. This method is suitable for large current occasions. Transformer: The magnetic field generated by the current in the primary winding of the transformer acts on the secondary winding to generate an electromotive force. By measuring the magnitude of this electromotive force, the current magnitude can be calculated. Transformers are widely used in high-precision current measurement occasions.

[0034] 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 appliances connected in series or in parallel as 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 obtaining method may include the following: collecting statistics on the current electrical appliances on each circuit, and obtaining the power consumption form and corresponding electric 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 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. 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-experiments 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, and then a pre-prepared state-power information table is searched according to the status data to obtain the power of each power device. For example, in actual work, there is a boiler on an electrical circuit of 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 according to 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 then we can obtain the power by looking up the table as 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 also 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 is 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 detection, 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 repeated here. For example, to calculate the theoretical output of a motor, the output at this time needs to be evaluated by the output speed. We assume that the output torque is the same under a working environment, which is not considered 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 power corresponding to the standard output is 12KW, and the proportional adjustment coefficient is 0.95. Then we calculate the theoretical power consumption. =9.975KW. Of course, this is just a simple example and is not universal. Other situations will not be elaborated here.

[0035] The calculation and analysis module is used to calculate the current I n And theoretical power consumption 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 they exceed 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 voltage or the inverse of voltage are not the same concept. The power evaluation value is calculated by theoretical power consumption and 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 calculate the power consumption evaluation value =5 / 1000=0.005. Of course, this is just a simple example calculation, which is not universal, and will not be described in detail here. In order to facilitate identification and subsequent calculations, the calculated power consumption evaluation value can also be amplified to facilitate identification, and will not be described in detail here.

[0036] The electricity consumption curve building module is used to calculate the power consumption curve according to 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 chronological order, so that the electricity consumption evaluation curve can be obtained. The electricity consumption evaluation curve can reflect the power consumption status of each power circuit, and at the same time, it can reflect the power 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., which is set according to actual needs.

[0037] The judgment and 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 power circuit has serious losses, and there is a serious deviation in the ratio between the actual power output and the effective power. At this time, not only a large amount of energy will be wasted, but the lost electricity will also generate a large amount of heat, wear or abnormal operation of the equipment, etc., resulting in a reduction in the life of the equipment or damage. 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 ability. In order to improve the alarm capability, the standard electricity consumption evaluation value E can be 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 , 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 inspection. 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 according to actual needs or experience, and of course it can also be obtained through calculation, as follows: Standard power evaluation value , where l, 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 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, 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 circuit tolerance. 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 is not 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 it is not repeated here. Through this method, the entire circuit can be evaluated, and the setting of the standard power consumption evaluation value takes into account the influence of voltage, circuit and power unit performance, etc. The calculation is accurate and practical, and the applicability is strong and the range is wide. 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, it is not necessarily universal, and I will not elaborate on it 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, and 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 , the details are not described here. Then determine whether the slope En' is greater than a preset standard variation coefficient E n标 ', if yes, then an early warning is issued, if not, then no early warning is issued. By judging the slope, the loss of the power circuit can be determined. 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 only manifest itself, but at this time the equipment or circuit has been severely damaged. By judging the slope, the deterioration trend of the circuit can be shown at the first time, and it can be discovered in time to nip the damage in the bud, avoid damage to the equipment or circuit, and avoid major losses to the greatest extent. The standard variation coefficient E n标 'It can be determined according to actual conditions or experience, generally ranging from 0.05 to 0.3. Of course, it can also be set as a gradient determination. Generally, three gradients are set to provide different degrees of early warning prompts. The details will not be repeated here.

[0038] Example 2 Reference Figure 2 The present invention also proposes a switch cabinet data acquisition method, comprising the following steps: 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.

[0039] S2. Obtain the theoretical power consumption P of each power circuit n .

[0040] S3, according to the current I n And theoretical power consumption P n Calculate the power consumption evaluation value E of the power circuit n .

[0041] S4. Based on the electricity consumption evaluation value E n Construct an electricity consumption evaluation curve for the electricity circuit.

[0042] 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.

[0043] S6. Calculate the slope E of the current electricity consumption evaluation curve n '.

[0044] S7, determine whether the slope En' is greater than a preset standard variation coefficient E n标 ', if yes, then issue a warning, if no, then do not issue a warning.

[0045] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A switch cabinet data acquisition system, characterized in that: The switch cabinet data acquisition system comprises: 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; The power unit acquisition module is used to obtain the theoretical power consumption P of each power circuit. n ; The calculation and analysis module is used to calculate the current I n And theoretical power consumption P n Calculate the power consumption evaluation value E of the power circuit n ; The electricity consumption curve building module is used to calculate the electricity consumption curve according to the electricity consumption evaluation value E. n Constructing an electricity consumption evaluation curve of the electricity consumption circuit; 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, if no, no alarm signal is sent; the slope E of the current electricity consumption evaluation curve is calculated n '; Determine whether the slope En' is greater than a preset standard variation coefficient E n标 ', if yes, then issue a warning, if no, then do not issue a warning.

2. A switch cabinet data acquisition system according to claim 1, characterized in that: The electricity consumption evaluation value .

3. A switch cabinet data acquisition system according to claim 1, characterized in that: The electricity consumption evaluation value .

4. A switch cabinet data acquisition system according to claim 1, characterized in that: The electricity consumption evaluation value , where U n The voltage of the power circuit.

5. 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 a numerical value, implanting the calculated electricity 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.

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

7. A switch cabinet data acquisition system according to claim 6, characterized in that: The multi-step alarm mode is a three-step alarm mode.

8. A switch cabinet data acquisition system according to claim 7, 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 , 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; when E 标 2 ≤E n <E 标 3 , a second-level alarm is issued; when E 标 3 ≤E n , and issue a third-level alarm.

9. A switch cabinet data acquisition system according to claim 8, characterized in that: Level 1 alarm notifies maintenance personnel to conduct inspection; level 2 alarm notifies maintenance personnel to conduct expedited inspection; level 3 alarm controls the opening and closing of power circuit switches ranked n.

10. A switch cabinet data collection method, characterized in that: The switch cabinet data collection method comprises: S1. 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; S2. Obtain the theoretical power consumption P of each power circuit n ; S3, according to the current I n And theoretical power consumption 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 of 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, an alarm signal is sent, if no, no alarm signal is sent; 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 a warning, if no, then do not issue a warning.

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