Distribution transformer oil temperature monitoring and early warning method, device, system and equipment

Abstract

The present invention discloses a method, device, system, and equipment for monitoring and warning oil temperature of a distribution transformer. The method includes the following steps: 1) obtaining the oil temperature value w of the distribution transformer, the oil temperature rise rate s within a preset time period, and the distribution transformer load rate k; 2) calculating the oil temperature alarm floating threshold value w1 and the oil temperature rise rate alarm floating threshold value s1 based on the distribution transformer load rate k; 3) comparing w with w1; when w>w1, determining that the oil temperature is high level one yellow warning condition is met; when w>w12, determining that the oil temperature is high level two red warning condition is met, where W12 is the oil temperature high level two red warning threshold value; comparing s with s1; when s>s1, determining that the oil temperature is high fast warning condition is met. The present invention can achieve accurate early warning of oil temperature and temperature rise.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of oil temperature monitoring of distribution transformers, and in particular to a method, device, system and equipment for monitoring and warning the oil temperature of distribution transformers. Background Art

[0002] Distribution transformers are crucial hub equipment in power distribution networks and are found in large numbers. Oil-immersed transformers are the primary component of these devices. Oil temperature is a crucial operating parameter for distribution transformers. Monitoring oil temperature and its changes can help analyze and determine the transformer's operating status. Traditional on-site inspections are often used to monitor transformer oil temperature, but this method has significant drawbacks and cannot readily detect abnormal oil temperatures.

[0003] The mature application of accurate collection and digitization technology for distribution transformer oil temperature and the promotion of integrated terminal use in substations have provided the technical conditions for remote monitoring and intelligent early warning of oil temperature. However, the current oil temperature monitoring cannot accurately distinguish between oil temperature anomalies caused by load influence and internal problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in response to the problems existing in the prior art, the present invention provides a distribution transformer oil temperature monitoring and early warning method, device, system and equipment that can realize accurate early warning of distribution transformer oil temperature and temperature rise.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0006] A distribution transformer oil temperature monitoring and early warning method comprises the following steps:

[0007] 1) Obtain the oil temperature w of the distribution transformer, the oil temperature rise rate s within a preset time period, and the distribution transformer load factor k;

[0008] 2) Calculating the oil temperature alarm floating threshold value w1 and the oil temperature rise rate alarm floating threshold value s1 according to the distribution transformer load rate k;

[0009] 3) Compare the oil temperature value w with the oil temperature alarm floating threshold value w1; when w>w1, it is determined that the oil temperature is too high, the yellow warning condition of level one is met, and a level one yellow warning is issued; when w>w12, it is determined that the oil temperature is too high, the red warning condition of level two is met, and a level two red warning is issued, where W12 is the fixed value of the oil temperature too high, the red warning threshold of level two is met;

[0010] The oil temperature rise rate s is compared with the oil temperature rise rate alarm floating threshold value s1; when s>s1, it is determined that the oil temperature rapid temperature rise warning condition is met, and a rapid temperature rise warning is issued.

[0011] As a further improvement of the above technical solution:

[0012] In step 2), the specific process of calculating the oil temperature alarm floating threshold value w1 according to the distribution transformer load rate k is as follows:

[0013] When k≤K1, w1=W11;

[0014] When k>K1, w1=W11*[1+K2*(k-K1)];

[0015] Among them, W11-oil temperature high yellow alarm threshold value;

[0016] K1-load rate affects the starting threshold;

[0017] K2-The impact rate of load rate on the high oil temperature alarm threshold.

[0018] In step 2), the specific process of calculating the oil temperature rise rate alarm floating threshold value s1 according to the distribution transformer load rate k is as follows:

[0019] When k≤K1, s1=S;

[0020] When k>K1, s1=S*[1+K3*(k-K1)];

[0021] Among them, S is the oil temperature rapid temperature rise alarm threshold value;

[0022] K3-The impact rate of load rate on the temperature rise alarm threshold.

[0023] In step 1), the power distribution load rate k is read from the data center of the substation edge computing terminal.

[0024] The present invention also discloses a distribution transformer oil temperature monitoring and early warning device, including a distribution transformer oil temperature sensor and an edge computing terminal. The distribution transformer oil temperature sensor is connected to the edge computing terminal, and is used to detect the oil temperature of the distribution transformer and send it to the edge computing terminal for analysis, and monitor and warn the oil temperature of the distribution transformer based on the analysis results.

[0025] As a further improvement of the above technical solution:

[0026] The distribution transformer oil temperature sensor is connected to the edge computing terminal via RS485 or wirelessly.

[0027] The edge computing terminal is connected to the power distribution master station, and the power distribution master station is used to visualize the uploaded oil temperature data.

[0028] The power distribution master station is connected to the terminal and is used to send oil temperature visualization display data and early warning signals to the terminal.

[0029] The present invention further discloses a distribution transformer oil temperature monitoring and early warning system, comprising:

[0030] The first program module is used to obtain the oil temperature value w of the distribution transformer, the oil temperature rise rate s within a preset time period, and the distribution transformer load factor k;

[0031] The second program module is used to calculate the oil temperature alarm floating threshold value w1 and the oil temperature rise rate alarm floating threshold value s1 according to the distribution transformer load rate k;

[0032] The third program module is used to compare the oil temperature value w with the oil temperature alarm floating threshold value w1; when w>w1, it is judged that the oil temperature is high and the yellow warning condition of the first level is met, and a first level yellow warning is issued; when w>W12, it is judged that the oil temperature is high and the red warning condition of the second level is met, and a second level red warning is issued, wherein W12 is the second level red warning threshold constant of the oil temperature; the oil temperature rise rate s is compared with the oil temperature rise rate alarm floating threshold value s1; when s>s1, it is judged that the oil temperature rise fast warning condition is met, and a fast temperature rise warning is issued.

[0033] The present invention also discloses a computer device, comprising a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is run by the processor, the steps of the above method are executed.

[0034] Compared with the prior art, the advantages of the present invention are:

[0035] The present invention digitizes the real-time oil temperature of the distribution transformer and accurately determines the oil temperature alarm floating threshold value w1 and the oil temperature rise rate alarm floating threshold value s1 based on the distribution transformer load rate k, thereby eliminating the normal temperature rise caused by load increase and achieving accurate early warning of the distribution transformer oil temperature and temperature rise. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The figure is a flow chart of an embodiment of the early warning method of the present invention.

[0037] Figure 2 This is a curve diagram of the high oil temperature alarm threshold value of the present invention.

[0038] Figure 3 This is a curve diagram of the oil temperature rapid temperature rise alarm threshold value of the present invention.

[0039] Figure 4 This is a diagram showing an embodiment of the early warning device of the present invention in a specific application. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] like Figure 1 As shown, the distribution transformer oil temperature monitoring and early warning method of this embodiment includes the following steps:

[0042] 1) Obtain the oil temperature w of the distribution transformer, the oil temperature rise rate s within a preset time period, and the distribution transformer load factor k;

[0043] 2) Calculate the oil temperature alarm floating threshold value w1 and the oil temperature rise rate alarm floating threshold value s1 based on the distribution transformer load factor k;

[0044] 3) Compare the oil temperature value w with the oil temperature alarm floating threshold value w1; when w>w1, it is determined that the oil temperature is too high, the yellow warning condition is met, and a yellow warning is issued; when w>w12, it is determined that the oil temperature is too high, the red warning condition is met, and a red warning is issued, where W12 is the oil temperature too high, the red warning threshold value;

[0045] The oil temperature rise rate s is compared with the oil temperature rise rate alarm floating threshold value s1; when s>s1, it is determined that the oil temperature rapid temperature rise warning condition is met and a rapid temperature rise warning is issued.

[0046] The present invention digitizes the real-time oil temperature of the distribution transformer and accurately determines the oil temperature alarm floating threshold value w1 and the oil temperature rise rate alarm floating threshold value s1 based on the distribution transformer load rate k, thereby eliminating the normal temperature rise caused by load increase and achieving accurate early warning of the distribution transformer oil temperature and temperature rise.

[0047] In a specific embodiment, in step 2), the specific process of calculating the oil temperature alarm floating threshold value w1 according to the distribution transformer load rate k is as follows:

[0048] When k≤K1, w1=W11;

[0049] When k>K1, w1=W11*[1+K2*(k-K1)];

[0050] Among them, W11-oil temperature high yellow alarm threshold value;

[0051] K1-load rate affects the starting threshold. The optimal value of the distribution transformer load rate is 57.7%, which can be set within the range of 50%-65%;

[0052] K2-The impact rate of load rate on the high oil temperature alarm threshold can be set between 16-25.

[0053] The specific process of calculating the oil temperature rise rate alarm floating threshold value s1 based on the distribution transformer load rate k is as follows:

[0054] When k≤K1, s1=S;

[0055] When k>K1, s1=S*[1+K3*(k-K1)];

[0056] Among them, S is the oil temperature rapid temperature rise alarm threshold value;

[0057] K3-The impact rate of load rate on the temperature rise alarm threshold can be set between 5-10.

[0058] like Figure 4 As shown, an embodiment of the present invention further provides a distribution transformer oil temperature monitoring and early warning device, including a distribution transformer oil temperature sensor and an edge computing terminal. The distribution transformer oil temperature sensor is connected to the edge computing terminal to detect the oil temperature of the distribution transformer and send it to the edge computing terminal for analysis. The distribution transformer oil temperature is monitored and early warning based on the analysis results. The distribution transformer oil temperature sensor and the edge computing terminal are connected via RS485 or wirelessly.

[0059] In addition, the edge computing terminal is connected to the power distribution master station, which is used to visualize the uploaded oil temperature data. The power distribution master station is connected to the terminal to send the oil temperature visualization data and warning signals to the terminal.

[0060] The present invention is further described in detail below in conjunction with a complete specific embodiment:

[0061] Install the substation edge computing terminal and distribution transformer oil temperature sensor on the distribution transformer. The distribution transformer oil temperature sensor uses 485 or wireless methods to transmit the collected distribution transformer oil temperature to the edge computing terminal. The edge computing function of the edge computing terminal is used to calculate the oil temperature rise, and a high oil temperature warning information is generated according to the high oil temperature warning rules. This warning information and oil temperature data are sent to the distribution master station through the substation edge computing terminal wireless module. The distribution master station visualizes the sent oil temperature data and sends the warning information of the oil temperature visualization display data set to the device owner's mobile phone.

[0062] The warning rules include high oil temperature warning and rapid temperature rise warning, which are described in detail as follows:

[0063] 1. Two-level warning for high oil temperature design:

[0064] The oil temperature high alarm threshold value has a two-stage broken line characteristic, such as Figure 2 As shown, Figure 2 middle,

[0065] W11—Yellow alarm threshold value for oil temperature one level higher;

[0066] W12—Level 2 red alarm threshold value for high oil temperature;

[0067] K1—Load rate affects the starting threshold;

[0068] K2—load rate impact on oil temperature high alarm threshold;

[0069] w—vertical axis, the collected distribution transformer oil temperature value;

[0070] k—abscissa, distribution transformer load rate read from the data center of the edge computing terminal;

[0071] Calculation: Calculate the oil temperature alarm floating threshold value w1 based on the collected distribution transformer load rate k:

[0072] When k≤K1: w1=W11; when k>K1: w1=W11*【1+K2*(k-K1)】.

[0073] Logical judgment: When w>W12, the oil temperature is judged to be high level 2 red warning; when w>w1, the oil temperature is judged to be high level 1 yellow warning.

[0074] The high oil temperature warning function compares the collected distribution transformer oil temperature with the second-level red threshold. If the value is greater than the threshold, the oil temperature is determined to meet the second-level red warning condition. If the value is less than the threshold, the oil temperature is compared with the warning floating threshold w1. If the value is less than the threshold, no alarm is issued; if the value is greater, a first-level yellow warning is issued. If both the first-level yellow warning and the second-level red warning are met, the high oil temperature telemeter is sent to the data center.

[0075] 2. The oil temperature rise alarm threshold value is a two-stage broken line characteristic, such as Figure 3 As shown:

[0076] A, oil temperature rapid rise threshold S;

[0077] B, read the load factor k of the distribution transformer, read the load factor k from the data center of the edge computing terminal, S—the threshold value for the alarm of rapid oil temperature rise;

[0078] K1—Load rate affects the starting threshold;

[0079] K3—the impact rate of load rate on the temperature rise alarm threshold;

[0080] s—vertical axis, the oil temperature rise rate calculated after collecting the distribution transformer oil temperature;

[0081] k—horizontal axis, distribution transformer load rate read from the data center of the edge computing terminal;

[0082] Calculation method of oil temperature rise rate: If the oil temperature of the distribution transformer changes by △w within a fixed time difference △t, the oil temperature rise rate is: s = △w / △t;

[0083] Calculation: Calculate the oil temperature rise rate alarm floating threshold value s1 based on the collected distribution transformer load rate k:

[0084] When k is less than or equal to K1, the oil temperature rapid rise warning threshold remains unchanged; that is, when k≤K1: the oil temperature alarm floating threshold value s1=S;

[0085] If k is greater than K1, the value will be increased by a ratio of K3 times the threshold value; that is, when k>K1, the oil temperature rapid rise warning floating threshold value s1=S*【1+K3*(k-K1)】.

[0086] Logical judgment: If s≤s1, no warning is issued; if s>s1, it is determined that the oil temperature rises rapidly and the warning conditions are met, and a warning is issued.

[0087] The purpose of the distribution transformer oil temperature monitoring and early warning of the present invention is to provide an early warning of high or rapid oil temperature rise caused by internal problems of the corresponding transformer, which is different from the normal temperature rise caused by increased load; this method summarizes a large amount of operating experience of oil-immersed transformers to determine the initial setting range of K1, K2 and K3. Later, the values ​​of K1, K2 and K3 can be optimized and adjusted based on a large amount of actual operating status data of the distribution transformer; through the above analysis, better early warning of high oil temperature and rapid oil temperature rise is given.

[0088] The embodiment of the present invention further provides a distribution transformer oil temperature monitoring and early warning system, comprising:

[0089] The first program module is used to obtain the oil temperature value w of the distribution transformer, the oil temperature rise rate s within a preset time period, and the distribution transformer load factor k;

[0090] The second program module is used to calculate the oil temperature alarm floating threshold value w1 and the oil temperature rise rate alarm floating threshold value s1 according to the distribution transformer load factor k;

[0091] The third program module is used to compare the oil temperature value w with the oil temperature alarm floating threshold value w1; when w>w1, it is judged that the oil temperature is high and the yellow warning condition of the first level is met, and a first level yellow warning is issued; when w>W12, it is judged that the oil temperature is high and the red warning condition of the second level is met, and a second level red warning is issued, wherein W12 is the second level red warning threshold constant of the oil temperature; the oil temperature rise rate s is compared with the oil temperature rise rate alarm floating threshold value s1; when s>s1, it is judged that the oil temperature rise fast warning condition is met, and a fast temperature rise warning is issued.

[0092] The early warning system of the present invention corresponds to the above-mentioned early warning method and also has the advantages described in the above-mentioned early warning method.

[0093] An embodiment of the present invention further provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the steps of the above method are executed.

[0094] As shown in this disclosure and the claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not specifically refer to the singular, but also include the plural. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0095] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A distribution transformer oil temperature monitoring and early warning method, characterized in that: Including steps: 1) Obtain the oil temperature w of the distribution transformer, the oil temperature rise rate s within a preset time period, and the distribution transformer load factor k; 2) Calculating the oil temperature alarm floating threshold value w1 and the oil temperature rise rate alarm floating threshold value s1 according to the distribution transformer load factor k; 3) Compare the oil temperature value w with the oil temperature alarm floating threshold value w1; when w>w1, it is determined that the oil temperature is too high, the yellow warning condition of the first level is met, and a yellow warning of the first level is issued; when w>w12, it is determined that the oil temperature is too high, the red warning condition of the second level is met, and a red warning of the second level is issued, where W12 is the fixed value of the oil temperature too high, the red warning threshold of the second level is issued; Compare the oil temperature rise rate s with the oil temperature rise rate alarm floating threshold s1; when s>s1, it is determined that the oil temperature rise rapid warning condition is met, and a rapid temperature rise warning is issued; In step 2), the specific process of calculating the oil temperature alarm floating threshold value w1 according to the distribution transformer load rate k is as follows: When k≤K1, w1=W11; When k>K1, w1=W11*[1+K2*(k-K1)]; Among them, W11 is the yellow alarm threshold value of oil temperature high level; K1—Load rate affects the starting threshold; K2—load rate impact on oil temperature high alarm threshold; In step 2), the specific process of calculating the oil temperature rise rate alarm floating threshold value s1 according to the distribution transformer load rate k is as follows: When k≤K1, s1=S; When k>K1, s1=S*[1+K3*(k-K1)]; Where S is the oil temperature rapid temperature rise alarm threshold value; K3—The impact of load rate on the temperature rise alarm threshold.

2. The distribution transformer oil temperature monitoring and early warning method according to claim 1 is characterized in that: In step 1), the power distribution load rate k is read from the data center of the substation edge computing terminal.

3. A distribution transformer oil temperature monitoring and early warning device, used to perform the steps of the method according to any one of claims 1 to 2, characterized in that: It includes a distribution transformer oil temperature sensor and an edge computing terminal. The distribution transformer oil temperature sensor is connected to the edge computing terminal, and is used to detect the oil temperature of the distribution transformer and send it to the edge computing terminal for analysis, and monitor and warn the oil temperature of the distribution transformer based on the analysis results.

4. The oil temperature monitoring and early warning device for distribution transformer according to claim 3, characterized in that: The distribution transformer oil temperature sensor is connected to the edge computing terminal via RS485 or wirelessly.

5. The oil temperature monitoring and early warning device for distribution transformer according to claim 3 or 4, characterized in that: The edge computing terminal is connected to the power distribution master station, and the power distribution master station is used to visualize the uploaded oil temperature data.

6. The distribution transformer oil temperature monitoring and early warning device according to claim 5, characterized in that: The power distribution master station is connected to the terminal and is used to send oil temperature visualization display data and early warning signals to the terminal.

7. A distribution transformer oil temperature monitoring and early warning system, used to perform the steps of the method according to any one of claims 1 to 2, characterized in that: include: The first program module is used to obtain the oil temperature value w of the distribution transformer, the oil temperature rise rate s within a preset time period, and the distribution transformer load factor k; The second program module is used to calculate the oil temperature alarm floating threshold value w1 and the oil temperature rise rate alarm floating threshold value s1 according to the distribution transformer load rate k; The third program module is used to compare the oil temperature value w with the oil temperature alarm floating threshold value w1; when w>w1, it is judged that the oil temperature is high and the yellow warning condition of the first level is met, and a first level yellow warning is issued; when w>W12, it is judged that the oil temperature is high and the red warning condition of the second level is met, and a second level red warning is issued, wherein W12 is the second level red warning threshold constant of the oil temperature; the oil temperature rise rate s is compared with the oil temperature rise rate alarm floating threshold value s1; when s>s1, it is judged that the oil temperature rise fast warning condition is met, and a fast temperature rise warning is issued.

8. A computer device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the computer program is executed by a processor, the computer program performs the steps of the method according to any one of claims 1 to 2.

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