Transformer safety monitoring method

Abstract

The invention discloses a transformer safety monitoring method. The method comprises the following steps: S1, data acquisition: respectively acquiring temperature, load current, voltage and insulation resistance parameters during operation of a transformer; s2, calculating a health index: calculating the health index according to the data collected in the step S1; and S3, setting an early warning level and a corresponding threshold value. Key parameters of the transformer can be monitored in real time, possible faults can be predicted by analyzing the data, traditional monitoring indexes of the transformer are considered, an insulation aging degree index is added for monitoring, the insulation aging degree index is combined with other traditional monitoring indexes, a health index is formed, comprehensive evaluation is provided for the state of the transformer, and the safety of the transformer is improved. The overall health condition of the transformer can be evaluated more accurately, and particularly, early warning can be carried out on the aging problem possibly occurring in long-term operation, so that operation and maintenance personnel can be helped to find potential problems in time.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer detection, and particularly to a transformer safety monitoring method. Background Art

[0002] A transformer is the core device of a substation and has the functions of voltage conversion and electric energy transmission. The operating state of the transformer is crucial for the normal operation of the entire substation. The transformer oil fills the entire interior of the transformer box and plays the roles of insulation, heat dissipation, and arc extinction. The winding realizes the voltage conversion function through electromagnetic conversion. To ensure the safe and reliable operation of the transformer, it is necessary to detect the transformer. In the prior art, the comprehensive evaluation is mainly carried out by collecting and recording voltage, load current, or temperature, and there are situations of misjudging the operating state of the transformer, and it is difficult to evaluate the influence of insulation aging on the transformer, resulting in low accuracy in monitoring the operating state of the transformer. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide an intelligent detection method for a distribution box, which can monitor the key parameters of the transformer in real time and predict possible faults by analyzing these data, helping to more accurately evaluate the overall health status of the transformer, especially for early warning of possible aging problems during long-term operation, and being able to help operation and maintenance personnel discover potential problems in time, and can effectively solve the problems in the background art.

[0004] To achieve the above object, the present invention provides the following technical solution: A transformer safety monitoring method, comprising the following steps:

[0005] Step S1, data acquisition: respectively acquire the temperature, load current, voltage, and insulation resistance parameters during the operation of the transformer;

[0006] Step S2, health index calculation: calculate the health index according to the data acquired in step S1 to quantify the health state of the transformer; The health index is expressed as: ; Wherein, , , , are respectively functions of temperature, load current, voltage, and insulation resistance, used to convert the original measurement values into standardized scores; , , , are weight coefficients; Temperature influence function: , wherein, is the measured temperature, is the optimal operating temperature, Control temperature sensitivity; Load current influence function: , where is the measured load current, is the rated current, is the maximum allowable current: Voltage influence function: , where is the measured voltage, is the minimum allowable voltage, is the maximum allowable voltage, is the target voltage, is the adjustment factor; Insulation resistance influence function: , where is the measured insulation resistance, is the lowest acceptable insulation resistance, is the insulation resistance at the time of new installation;

[0007] Step S3, warning level and corresponding threshold setting: Normal state: 0.85, indicating that the transformer is in good operating condition and does not require special attention; Attention state: 0.65 0.85, indicating that there are slight abnormalities and close observation is required; Warning state: 0.45 0.65, indicating that there are obvious problems and further inspection is required; Emergency state: 0.45, indicating that the transformer faces a serious failure risk and immediate action should be taken.

[0008] Preferably, in the step S1, , , , The standardized scores of are 0 - 1.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: It can monitor the key parameters of the transformer in real time and predict possible faults by analyzing these data. It not only considers the traditional monitoring indicators of the transformer (such as temperature, load current, voltage, etc.), but also introduces the index of insulation aging degree for monitoring, and combines it with other traditional monitoring indicators to form a health index, providing a comprehensive evaluation of the state of the transformer, which helps to more accurately evaluate the overall health status of the transformer, especially for early warning of aging problems that may occur during long-term operation, and can help the operation and maintenance personnel to detect potential problems in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic flow chart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or positional relationship, it is only corresponding to the drawings of the present application for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation.

[0012] Please refer to Figure 1 , the present invention provides a technical solution: a transformer safety monitoring method, characterized in that it includes the following steps:

[0013] Step S1, data acquisition: respectively acquire the temperature, load current, voltage and insulation resistance parameters during the operation of the transformer;

[0014] Step S2, health index calculation: calculate the health index according to the data acquired in step S1 to quantify the health state of the transformer;

[0015] The health index is expressed as: ;

[0016] Wherein, , , , are respectively functions of temperature, load current, voltage and insulation resistance, used to convert the original measured values into standardized scores, , , , The standardized scores of are 0-1; , , , are weight coefficients;

[0017] Temperature influence function: , where is the measured temperature, is the optimal operating temperature, controls the temperature sensitivity;

[0018] Load current influence function: , where is the measured load current, is the rated current, is the maximum allowable current:

[0019] Voltage influence function: , where is the measured voltage, is the minimum allowable voltage, is the maximum allowable voltage, is the target voltage, is the adjustment factor;

[0020] Insulation resistance influence function: , where is the measured insulation resistance, is the lowest acceptable insulation resistance, is the insulation resistance at the time of new installation;

[0021] For each influence function , , , The parameters in also need to be adjusted according to the actual situation:

[0022] Temperature influence function: By analyzing the optimal operating temperature range of the transformer, adjust and . If it is found that the transformer has the best performance within a certain specific temperature range, then should be set within this temperature range, and should be adjusted according to the temperature fluctuation;

[0023] Load current and voltage influence functions: Determine , , and and other parameters according to the technical specification of the transformer;

[0024] Insulation resistance influence function: can be set according to the standards provided by the manufacturer, while should be based on the measured values at the time of transformer installation;

[0025] Step S3, Warning level and corresponding threshold setting:

[0026] Normal state: 0.85, indicating that the transformer is operating well and does not require special attention;

[0027] Attention state: 0.65 0.85, suggesting that there may be a slight anomaly and it is recommended to observe closely;

[0028] Warning state: 0.45 0.65, indicating that there are obvious problems and further inspection is required;

[0029] Emergency state: 0.45, indicating that the transformer may face the risk of serious failure and immediate action should be taken;

[0030] When HI is lower than the preset threshold, an alarm is triggered. The alarm methods can include but are not limited to SMS notification, email reminder, APP push, etc., to ensure that relevant personnel can receive the information in a timely manner;

[0031] It is possible to monitor the key parameters of the transformer in real time and predict possible failures by analyzing these data. Not only traditional monitoring indicators of the transformer (such as temperature, load current, voltage, etc.) are considered, but also an indicator of the degree of insulation aging is introduced for monitoring, and it is combined with other traditional monitoring indicators to form a health index, providing a comprehensive assessment of the state of the transformer, which helps to more accurately evaluate the overall health status of the transformer, especially for early warning of aging problems that may occur during long-term operation, and can help maintenance personnel discover potential problems in a timely manner.

[0032] The parts not detailed in the present invention are prior art. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting, aiming to include all changes falling within the meaning and scope of the equivalent elements in the content of the present invention.

Claims

1. A transformer safety monitoring method, characterized in that: The following steps are involved: Step S1, data collection: respectively collecting the temperature, load current, voltage and insulation resistance parameters of the transformer during operation; Step S2, health index calculation: Calculate the health index based on the data collected in step S1 to quantify the health status of the transformer; The health index is expressed as: ; in, , , , They are functions of temperature, load current, voltage, and insulation resistance, respectively, used to convert raw measurements into standardized scores; , , , is the weight coefficient; Temperature influence function: ,in, is the measured temperature, is the optimal operating temperature, Control temperature sensitivity; Load current affects the function: ,in, is the measured load current, is the rated current, is the maximum allowable current: Voltage influence function: ,in, is the measured voltage, is the minimum allowable voltage, is the maximum allowable voltage, is the target voltage, is the regulating factor; Insulation resistance influence function: ,in, is the measured insulation resistance, is the minimum acceptable insulation resistance, is the insulation resistance when newly installed; Step S3: Setting of warning level and corresponding thresholds: Normal state: 0.85, indicating that the transformer is in good condition and does not require any special attention; Attention Status: 0.65 0.85, indicating that there may be slight abnormalities, and close observation is recommended; Warning status: 0.45 0.65, indicating an obvious problem and requiring further inspection; State of Emergency: 0.45, indicating that the transformer may be at risk of serious failure and immediate action should be taken.

2. A transformer safety monitoring method according to claim 1, characterized in that: In the step S1, , , , The standardized score is 0-1.

Images