500kV transformer state monitoring method and system

Abstract

The invention provides a 500kV transformer state monitoring method and system, and the method comprises the steps: obtaining the three-ratio data of a 500kV transformer when the chromatographic online data of the 500kV transformer meets a first preset condition; respectively determining codes corresponding to the three-ratio data according to the gas ratio range to which the three-ratio data of the transformer belongs; determining the fault type of the 500kV transformer according to the codes corresponding to the three-ratio data; wherein the three-ratio data comprises the ratio data of C2H2 / C2H4, the ratio data of CH4 / H2, and the ratio data of C2H4 / C2H6. According to the technical scheme provided by the invention, the electrified state of the transformer can be monitored, hidden dangers of equipment can be found in time, the maintenance time of the transformer is shortened, and the maintenance quality of the transformer is improved.

Description

Technical Field

[0001] The present application relates to the field of transformer health monitoring, and in particular to a 500kV transformer status monitoring method and system. Background Art

[0002] Transformers are an important part of the power system. The higher the transformer voltage level, the greater the manufacturing difficulty and cost. The current power market is short of power supply, the power load is high, the number of transformers in the power supply and distribution system is large, the annual equipment power outage maintenance time is concentrated, the maintenance time is short, the work intensity is high, and the routine maintenance electrical preventive test voltage is low, which makes it difficult to find problems with the transformer. If the transformer fails with a problem, it will cause significant economic losses. Summary of the invention

[0003] The present application provides a 500kV transformer status monitoring method and system to at least solve the technical problem that the transformer cannot be repaired under power and it is difficult to find problems with the transformer.

[0004] The first embodiment of the present application provides a 500kV transformer state monitoring method, the method comprising:

[0005] When the chromatogram online data of the 500 kV transformer meets the first preset condition, acquiring the three ratio data of the transformer;

[0006] Determine the codes corresponding to the three ratio data respectively according to the gas ratio range to which the three ratio data of the transformer belong;

[0007] Determine the fault type of the 500kV transformer according to the codes corresponding to the three ratio data;

[0008] The three ratio data include: C2H2 / C2H4 ratio data, CH4 / H2 ratio data, and C2H4 / C2H6 ratio data.

[0009] Preferably, when the chromatogram online data of the 500 kV transformer meets the first preset condition, before obtaining the three ratio data of the transformer, it also includes:

[0010] Screening out each test data that is greater than its corresponding threshold value in the chromatogram online data of the 500kV transformer;

[0011] Determine the absolute gas production rate corresponding to each test data;

[0012] Based on the absolute gas production rate corresponding to each test data, the change trend of the chromatogram online data of the 500kV transformer is analyzed;

[0013] The first preset condition includes:

[0014] There is a deviation between the chromatogram online data of the 500kV transformer and the chromatogram offline data of the 500kV transformer, and the change trend of the chromatogram online data of the 500kV transformer is consistent.

[0015] Further, the codes corresponding to the three ratio data are determined respectively according to the gas ratio range to which the three ratio data of the transformer belong, including:

[0016] When the C2H2 / C2H4 ratio data belongs to the preset first gas ratio range, the code corresponding to the C2H2 / C2H4 ratio data is 0;

[0017] When the C2H2 / C2H4 ratio data belongs to the preset gas ratio second range or third range, the code corresponding to the C2H2 / C2H4 ratio data is 1;

[0018] When the C2H2 / C2H4 ratio data belongs to the preset fourth gas ratio range, the code corresponding to the C2H2 / C2H4 ratio data is 2;

[0019] When the CH4 / H2 ratio data belongs to the preset first gas ratio range, the code corresponding to the CH4 / H2 ratio data is 1;

[0020] When the CH4 / H2 ratio data belongs to the preset second gas ratio range, the code corresponding to the CH4 / H2 ratio data is 0;

[0021] When the CH4 / H2 ratio data belongs to the preset gas ratio third range or fourth range, the code corresponding to the CH4 / H2 ratio data is 2;

[0022] When the C2H4 / C2H6 ratio data belongs to the preset gas ratio first range or second range, the code corresponding to the C2H4 / C2H6 ratio data is 0;

[0023] When the C2H4 / C2H6 ratio data belongs to the preset third range of gas ratios, the code corresponding to the C2H4 / C2H6 ratio data is 1;

[0024] When the C2H4 / C2H6 ratio data belongs to the preset fourth range of gas ratios, the code corresponding to the C2H4 / C2H6 ratio data is 2.

[0025] Further, the determining the fault type of the 500kV transformer according to the codes corresponding to the three ratio data respectively includes:

[0026] When the code corresponding to the C2H2 / C2H4 ratio data is 0:

[0027] If the code corresponding to the CH4 / H2 ratio data is 0 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is the first low-temperature overheating;

[0028] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is the second low temperature overheating;

[0029] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 1, the fault type of the 500kV transformer is medium temperature overheating;

[0030] If the code corresponding to the CH4 / H2 ratio data is 0, 1 or 2 and the code corresponding to the C2H4 / C2H6 ratio data is 2, the fault type of the 500kV transformer is high temperature overheating;

[0031] If the code corresponding to the CH4 / H2 ratio data is 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is partial discharge;

[0032] When the code corresponding to the C2H2 / C2H4 ratio data is 1:

[0033] If the code corresponding to the CH4 / H2 ratio data is 0 or 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is arc discharge;

[0034] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is arc discharge and overheating;

[0035] When the code corresponding to the C2H2 / C2H4 ratio data is 2:

[0036] If the code corresponding to the CH4 / H2 ratio data is 0 or 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is low-energy discharge;

[0037] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is low-energy discharge and overheating.

[0038] Furthermore, the method further comprises:

[0039] Obtaining the operating data of the 500kV transformer, wherein the operating data includes: oil temperature, winding temperature, core and clamp grounding current, cooler cooling water flow, cooler cooling water pressure, conservator oil level, bushing capacitance and dielectric loss, and chromatographic data;

[0040] Determine whether each operating data is greater than its corresponding alarm threshold. If so, an alarm is issued.

[0041] Furthermore, the method further comprises:

[0042] Determine respectively a first mean value of each operation data within a first preset time length and a second mean value of each operation data within a second preset time length;

[0043] Determine the difference between the first mean and the second mean of each running data respectively;

[0044] It is determined whether the 500 kV transformer is faulty based on the difference.

[0045] Furthermore, the method further comprises:

[0046] When the 500kV transformer is a double-winding transformer:

[0047] Obtain the line voltage and phase current on the high-voltage side and the line voltage and phase current on the low-voltage side of the 500kV transformer, and determine the real-time apparent power of the 500kV transformer according to the line voltage and phase current on the high-voltage side and the line voltage and phase current on the low-voltage side;

[0048] Determine whether the real-time apparent power of the 500kV transformer is greater than the rated apparent power. If so, determine that the 500kV transformer has an overload operation fault and issue an alarm;

[0049] When the 500kV transformer is an autotransformer:

[0050] Obtaining the line voltage and phase current and the rated current of the common winding on the high-voltage side of the 500kV transformer, and determining the real-time apparent power of the 500kV transformer according to the line voltage and phase current and the rated current of the common winding on the high-voltage side;

[0051] Determine whether the real-time apparent power of the 500kV transformer is greater than the rated apparent power. If so, determine that the 500kV transformer has an overload operation fault and issue an alarm.

[0052] Furthermore, the method further comprises:

[0053] Determine whether the operating status of the 500kV transformer satisfies the first preset condition, the second preset condition, the third preset condition and the fourth preset condition; if so, determine that the 500kV transformer has a cooler oil flow or water flow complete interruption fault, and control the 500kV transformer to trip;

[0054] The first preset condition includes: the oil flow of oil pump No. 1 is interrupted, the oil flow of oil pump No. 2 is interrupted, the oil flow of oil pump No. 3 is interrupted, or the water flow of cooler No. 1 is interrupted, the water flow of cooler No. 2 is interrupted, and the water flow of cooler No. 3 is interrupted;

[0055] The second preset condition includes: the oil temperature switch value of the 500kV transformer is greater than or equal to 70°C, or the oil temperature analog value of the 500kV transformer is greater than or equal to 70°C;

[0056] The third preset condition includes: the main transformer oil temperature switch value in the non-electrical protection device is greater than 75°C, and the main transformer oil temperature switch value in the non-electrical protection device is less than or equal to 75°C, or the cold control power failure fixed delay is 3600s.

[0057] The fourth preset condition includes: the main transformer high-voltage side disconnector is in the closed position, the soft pressure plate and the hard pressure plate are in operation, and the cold control power failure protection delay is 1200s.

[0058] Furthermore, the method further comprises:

[0059] When the 500kV transformer fails, the fault information is pushed to the information receiving device of the staff.

[0060] The second embodiment of the present application provides a 500kV transformer status monitoring system, including:

[0061] An acquisition module, used for acquiring three ratio data of a 500 kV transformer when the chromatogram online data of the transformer meets a first preset condition;

[0062] A first determination module, configured to determine the codes corresponding to the three ratio data respectively according to the gas ratio range to which the three ratio data of the transformer belong;

[0063] A second determination module is used to determine the fault type of the 500kV transformer according to the codes corresponding to the three ratio data;

[0064] The three ratio data include: C2H2 / C2H4 ratio data, CH4 / H2 ratio data, and C2H4 / C2H6 ratio data.

[0065] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0066] The present application proposes a 500kV transformer state monitoring method and system, the method comprising: when the chromatogram online data of the 500kV transformer meets the first preset condition, obtaining the three ratio data of the transformer; determining the codes corresponding to the three ratio data respectively according to the gas ratio range to which the three ratio data of the transformer belong; determining the fault type of the 500kV transformer according to the codes corresponding to the three ratio data; wherein the three ratio data include: C2H2 / C2H4 ratio data, CH4 / H2 ratio data, C2H4 / C2H6 ratio data. The technical solution proposed in the present application can realize the live state monitoring of the transformer, can timely discover the hidden dangers of the equipment, shorten the transformer maintenance time, and improve the transformer maintenance quality.

[0067] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0069] Figure 1 A flowchart of a 500kV transformer status monitoring method provided according to an embodiment of the present application;

[0070] Figure 2 A first structural diagram of a 500kV transformer condition monitoring system provided according to an embodiment of the present application;

[0071] Figure 3 A second structural diagram of a 500kV transformer condition monitoring system provided according to an embodiment of the present application;

[0072] Figure 4 A third structural diagram of a 500kV transformer condition monitoring system provided according to an embodiment of the present application;

[0073] Figure 5 A fourth structural diagram of a 500kV transformer condition monitoring system provided according to an embodiment of the present application;

[0074] Figure 6 A fifth structural diagram of a 500kV transformer condition monitoring system provided according to an embodiment of the present application;

[0075] Figure 7A sixth structural diagram of a 500kV transformer condition monitoring system provided according to an embodiment of the present application;

[0076] Figure 8 This is a seventh structural diagram of a 500kV transformer status monitoring system provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0077] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0078] The present application proposes a 500kV transformer state monitoring method and system, the method comprising: when the chromatogram online data of the 500kV transformer meets the first preset condition, obtaining the three ratio data of the transformer; determining the codes corresponding to the three ratio data respectively according to the gas ratio range to which the three ratio data of the transformer belong; determining the fault type of the 500kV transformer according to the codes corresponding to the three ratio data; wherein the three ratio data include: C2H2 / C2H4 ratio data, CH4 / H2 ratio data, C2H4 / C2H6 ratio data. The technical solution proposed in the present application can realize the live state monitoring of the transformer, can timely discover the hidden dangers of the equipment, shorten the transformer maintenance time, and improve the transformer maintenance quality.

[0079] A 500kV transformer status monitoring method and system according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0080] Embodiment 1

[0081] Figure 1 A flow chart of a 500kV transformer status monitoring method provided according to an embodiment of the present application is shown in FIG. Figure 1 As shown, the method includes:

[0082] Step 1: When the chromatogram online data of the 500 kV transformer meets the first preset condition, the three ratio data of the transformer are obtained;

[0083] The three ratio data include: C2H2 / C2H4 ratio data, CH4 / H2 ratio data, and C2H4 / C2H6 ratio data.

[0084] It should be noted that when the chromatogram online data of the 500 kV transformer meets the first preset condition, before obtaining the three ratio data of the transformer, it also includes:

[0085] 1. Screen out the test data that are greater than the corresponding threshold value in the chromatogram online data of the 500kV transformer;

[0086] 2. Determine the absolute gas production rate corresponding to each test data;

[0087] The calculation formula of the absolute gas production rate is as follows:

[0088]

[0089] In the formula, γ a,i is the absolute gas production rate corresponding to the i-th gas: mL / day; C i.1 The concentration of the i-th gas in the oil measured for the first sampling: μL / L; C i.2 The concentration of the i-th gas in the oil measured for the second sampling is: μL / L; Δt is the actual operating time between the two sampling intervals: days; m is the total oil volume of the equipment: t; ρ is the density of the oil: t / m 3 .

[0090] 3. Based on the absolute gas production rate corresponding to each test data, the change trend of the chromatogram online data of the 500kV transformer is analyzed;

[0091] The first preset condition includes:

[0092] There is a deviation between the chromatogram online data of the 500kV transformer and the chromatogram offline data of the 500kV transformer, and the change trend of the chromatogram online data of the 500kV transformer is consistent.

[0093] Step 2: Determine the codes corresponding to the three ratio data respectively according to the gas ratio range to which the three ratio data of the transformer belong;

[0094] In the embodiment of the present disclosure, step 2 specifically includes:

[0095] When the C2H2 / C2H4 ratio data belongs to the preset first gas ratio range, the code corresponding to the C2H2 / C2H4 ratio data is 0;

[0096] When the C2H2 / C2H4 ratio data belongs to the preset gas ratio second range or third range, the code corresponding to the C2H2 / C2H4 ratio data is 1;

[0097] When the C2H2 / C2H4 ratio data belongs to the preset fourth gas ratio range, the code corresponding to the C2H2 / C2H4 ratio data is 2;

[0098] When the CH4 / H2 ratio data belongs to the preset first gas ratio range, the code corresponding to the CH4 / H2 ratio data is 1;

[0099] When the CH4 / H2 ratio data belongs to the preset second gas ratio range, the code corresponding to the CH4 / H2 ratio data is 0;

[0100] When the CH4 / H2 ratio data belongs to the preset gas ratio third range or fourth range, the code corresponding to the CH4 / H2 ratio data is 2;

[0101] When the C2H4 / C2H6 ratio data belongs to the preset gas ratio first range or second range, the code corresponding to the C2H4 / C2H6 ratio data is 0;

[0102] When the C2H4 / C2H6 ratio data belongs to the preset third range of gas ratios, the code corresponding to the C2H4 / C2H6 ratio data is 1;

[0103] When the C2H4 / C2H6 ratio data belongs to the preset fourth range of gas ratios, the code corresponding to the C2H4 / C2H6 ratio data is 2.

[0104] It should be noted that the preset first range of gas ratio may be less than 0.1;

[0105] The preset second range of gas ratio may be greater than or equal to 0.1 and less than 1;

[0106] The preset third range of gas ratio may be greater than or equal to 1 and less than 3;

[0107] The preset fourth range of gas ratio may be greater than or equal to 3.

[0108] Step 3: Determine the fault type of the 500kV transformer according to the codes corresponding to the three ratio data;

[0109] In the embodiment of the present disclosure, step 3 specifically includes:

[0110] When the code corresponding to the C2H2 / C2H4 ratio data is 0:

[0111] If the code corresponding to the CH4 / H2 ratio data is 0 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is the first low-temperature overheating;

[0112] It should be noted that the first low-temperature overheating corresponds to a temperature below 150 degrees. The cause of the fault may be overheating of the paper-wrapped insulated wire. It is necessary to pay attention to the increment of CO and CO2 and the CO / CO2 value;

[0113] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is the second low temperature overheating;

[0114] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 1, the fault type of the 500kV transformer is medium temperature overheating;

[0115] If the code corresponding to the CH4 / H2 ratio data is 0, 1 or 2 and the code corresponding to the C2H4 / C2H6 ratio data is 2, the fault type of the 500kV transformer is high temperature overheating;

[0116] It should be noted that the temperature corresponding to the second low-temperature overheating is greater than or equal to 150 degrees and less than 300 degrees, the temperature corresponding to the medium-temperature overheating is greater than or equal to 300 degrees and less than or equal to 700 degrees, and the temperature corresponding to the high-temperature overheating is greater than 700 degrees. The causes of the second low-temperature overheating, medium-temperature overheating, and high-temperature overheating may be 1. Poor contact of the tap changer; 2. Poor lead connection; 3. Poor welding of the wire joints, short circuit between strands causing overheating; 4. Multiple grounding of the iron core, local short circuit between silicon steel sheets, etc.

[0117] If the code corresponding to the CH4 / H2 ratio data is 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is partial discharge;

[0118] It should be noted that the cause of the partial discharge failure may be: discharge with low energy density caused by high humidity, air gap, burr, paint nodule, impurities, etc.

[0119] When the code corresponding to the C2H2 / C2H4 ratio data is 1:

[0120] If the code corresponding to the CH4 / H2 ratio data is 0 or 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is arc discharge;

[0121] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is arc discharge and overheating;

[0122] It should be noted that the causes of the arc discharge, arc discharge and overheating faults may be: 1. Discharge between coil turns and layers, and phase-to-phase flashover; 2. Oil gap flashover between tap leads, and arcing of the selector switch; 3. Discharge of the lead to the box shell or other grounding body.

[0123] When the code corresponding to the C2H2 / C2H4 ratio data is 2:

[0124] If the code corresponding to the CH4 / H2 ratio data is 0 or 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is low-energy discharge;

[0125] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is low-energy discharge and overheating.

[0126] It should be noted that the causes of the low-energy discharge, low-energy discharge and overheating failures may be: spark discharge between different potentials, and circulating current between the lead wire and the cable bushing (or lead wire shielding tube).

[0127] Furthermore, the method further comprises:

[0128] Obtaining the operating data of the 500kV transformer, wherein the operating data includes: oil temperature, winding temperature, core and clamp grounding current, cooler cooling water flow, cooler cooling water pressure, conservator oil level, bushing capacitance and dielectric loss, and chromatographic data;

[0129] Determine whether each operating data is greater than its corresponding alarm threshold. If so, an alarm is issued.

[0130] Furthermore, the method further comprises:

[0131] Determine respectively a first mean value of each operation data within a first preset time length and a second mean value of each operation data within a second preset time length;

[0132] Determine the difference between the first mean and the second mean of each running data respectively;

[0133] It is determined whether the 500 kV transformer is faulty based on the difference.

[0134] It should be noted that trend analysis is performed on data such as transformer oil temperature, winding temperature, core and clamp grounding current, transformer cooler cooling water flow, transformer cooler cooling water pressure, oil pillow oil level, bushing capacitance and dielectric loss. For example, the average value of the day is subtracted from the average value of the previous few days. If the difference is within the set range, it is judged to be stable, if it exceeds the range, it is judged to be rising, and if the difference is a negative value, it is judged to be falling. By analyzing the trend of the change of the oil pillow oil level, it is possible to analyze whether there is a leak in the equipment; by analyzing the trend of the change of the transformer cooler cooling water flow and the transformer cooler cooling water pressure, it is possible to analyze whether there is a blockage in the cooling water pipeline.

[0135] Furthermore, the method further comprises:

[0136] When the 500kV transformer is a double-winding transformer:

[0137] Obtain the line voltage and phase current on the high-voltage side and the line voltage and phase current on the low-voltage side of the 500kV transformer, and determine the real-time apparent power of the 500kV transformer according to the line voltage and phase current on the high-voltage side and the line voltage and phase current on the low-voltage side;

[0138] Determine whether the real-time apparent power of the 500kV transformer is greater than the rated apparent power. If so, determine that the 500kV transformer has an overload operation fault and issue an alarm;

[0139] It should be noted that the calculation formula of the first real-time apparent power S1 is as follows:

[0140]

[0141] S=u 1.A i 1.A +u 1.B i 1.B +u 1.C i 1.C =u 2.A i 2.A +u 2.B i 2.B +u 2.C i 2.C

[0142] In the formula, U1 and U2 represent the line voltage on the high voltage side and the low voltage side respectively: kV; I1 and I2 represent the phase current on the high voltage side and the low voltage side respectively: kA; u 1.A ,u 1.B ,u 1.C Represent the three-phase voltage on the high-voltage side, i 1.A ,i 1.B ,i 1.C Respectively represent the three-phase current on the high-voltage side; u 2.A ,u 2.B ,u2.C Respectively represent the three-phase voltage on the low-voltage side, i 2.A ,i 2.B ,i 2.C Respectively represent the three-phase currents on the low-voltage side.

[0143] When the 500kV transformer is an autotransformer:

[0144] Obtaining the line voltage and phase current and the rated current of the common winding on the high-voltage side of the 500kV transformer, and determining the real-time apparent power of the 500kV transformer according to the line voltage and phase current and the rated current of the common winding on the high-voltage side;

[0145] Determine whether the real-time apparent power of the 500kV transformer is greater than the rated apparent power. If so, determine that the 500kV transformer has an overload operation fault and issue an alarm.

[0146] It should be noted that the calculation formula of the real-time apparent power S2 is as follows:

[0147]

[0148] In the formula, U represents the line voltage on the high-voltage side: kV; I represents the phase current on the high-voltage side: kA; I e Indicates the current flowing through the common winding: kA, where the rated current on the high voltage side is: Rated current on medium voltage side: Common winding rated current: I e =I e2 -I e1 .

[0149] Among them, in the actual operation of the autotransformer, there is a situation where the apparent power is not overloaded, but the common winding is overloaded. The common winding current of the transformer is calculated, and an alarm is issued when it exceeds the alarm value, and the transformer power flow is adjusted in time.

[0150] Furthermore, the method further comprises:

[0151] Determine whether the operating status of the 500kV transformer satisfies the first preset condition, the second preset condition, the third preset condition and the fourth preset condition; if so, determine that the 500kV transformer has a cooler oil flow or water flow complete interruption fault, and control the 500kV transformer to trip;

[0152] The first preset condition includes: the oil flow of oil pump No. 1 is interrupted, the oil flow of oil pump No. 2 is interrupted, the oil flow of oil pump No. 3 is interrupted, or the water flow of cooler No. 1 is interrupted, the water flow of cooler No. 2 is interrupted, and the water flow of cooler No. 3 is interrupted;

[0153] The second preset condition includes: the oil temperature switch value of the 500kV transformer is greater than or equal to 70°C, or the oil temperature analog value of the 500kV transformer is greater than or equal to 70°C;

[0154] The third preset condition includes: the main transformer oil temperature switch value in the non-electrical protection device is greater than 75°C, and the main transformer oil temperature switch value in the non-electrical protection device is less than or equal to 75°C, or the cold control power failure fixed delay is 3600s.

[0155] The fourth preset condition includes: the main transformer high-voltage side disconnector is in the closed position, the soft pressure plate and the hard pressure plate are in operation, and the cold control power failure protection delay is 1200s.

[0156] Furthermore, the method further comprises:

[0157] When the 500kV transformer fails, the fault information is pushed to the information receiving device of the staff.

[0158] It should be noted that the transformer online data is monitored online, the data is analyzed, abnormal signals are promptly alarmed, and pushed to relevant professionals. Professionals understand the equipment status in real time and adjust the equipment operation mode in time according to the equipment implementation status.

[0159] In summary, the 500kV transformer status monitoring method proposed in this embodiment can realize the transformer live status monitoring, can timely discover the hidden dangers of the equipment, formulate corresponding treatment measures for the hidden dangers, shorten the transformer maintenance time, and improve the transformer maintenance quality.

[0160] Embodiment 2

[0161] Figure 2 FIG. 1 is a structural diagram of a 500 kV transformer status monitoring system provided according to an embodiment of the present application, such as Figure 2 As shown, the system comprises:

[0162] An acquisition module 100 is used to acquire three ratio data of a 500 kV transformer when the chromatogram online data of the transformer meets a first preset condition;

[0163] A first determination module 200 is used to determine the codes corresponding to the three ratio data respectively according to the gas ratio range to which the three ratio data of the transformer belong;

[0164] A second determination module 300 is used to determine the fault type of the 500 kV transformer according to the codes corresponding to the three ratio data;

[0165] The three ratio data include: C2H2 / C2H4 ratio data, CH4 / H2 ratio data, and C2H4 / C2H6 ratio data.

[0166] In the embodiments of the present disclosure, Figure 3 As shown, the system further includes: a first judgment module 400;

[0167] The first determination module 400 is used for:

[0168] Screening out each test data that is greater than its corresponding threshold value in the chromatogram online data of the 500kV transformer;

[0169] Determine the absolute gas production rate corresponding to each test data;

[0170] Based on the absolute gas production rate corresponding to each test data, the change trend of the chromatogram online data of the 500kV transformer is analyzed;

[0171] The first preset condition includes:

[0172] There is a deviation between the chromatogram online data of the 500kV transformer and the chromatogram offline data of the 500kV transformer, and the change trend of the chromatogram online data of the 500kV transformer is consistent.

[0173] In the embodiment of the present disclosure, the first determining module 200 is specifically used to:

[0174] When the C2H2 / C2H4 ratio data belongs to the preset first gas ratio range, the code corresponding to the C2H2 / C2H4 ratio data is 0;

[0175] When the C2H2 / C2H4 ratio data belongs to the preset gas ratio second range or third range, the code corresponding to the C2H2 / C2H4 ratio data is 1;

[0176] When the C2H2 / C2H4 ratio data belongs to the preset fourth gas ratio range, the code corresponding to the C2H2 / C2H4 ratio data is 2;

[0177] When the CH4 / H2 ratio data belongs to the preset first gas ratio range, the code corresponding to the CH4 / H2 ratio data is 1;

[0178] When the CH4 / H2 ratio data belongs to the preset second gas ratio range, the code corresponding to the CH4 / H2 ratio data is 0;

[0179] When the CH4 / H2 ratio data belongs to the preset gas ratio third range or fourth range, the code corresponding to the CH4 / H2 ratio data is 2;

[0180] When the C2H4 / C2H6 ratio data belongs to the preset gas ratio first range or second range, the code corresponding to the C2H4 / C2H6 ratio data is 0;

[0181] When the C2H4 / C2H6 ratio data belongs to the preset third range of gas ratios, the code corresponding to the C2H4 / C2H6 ratio data is 1;

[0182] When the C2H4 / C2H6 ratio data belongs to the preset fourth range of gas ratios, the code corresponding to the C2H4 / C2H6 ratio data is 2.

[0183] In the embodiment of the present disclosure, the second determining module 300 is specifically used to:

[0184] When the code corresponding to the C2H2 / C2H4 ratio data is 0:

[0185] If the code corresponding to the CH4 / H2 ratio data is 0 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is the first low-temperature overheating;

[0186] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is the second low temperature overheating;

[0187] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 1, the fault type of the 500kV transformer is medium temperature overheating;

[0188] If the code corresponding to the CH4 / H2 ratio data is 0, 1 or 2 and the code corresponding to the C2H4 / C2H6 ratio data is 2, the fault type of the 500kV transformer is high temperature overheating;

[0189] If the code corresponding to the CH4 / H2 ratio data is 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is partial discharge;

[0190] When the code corresponding to the C2H2 / C2H4 ratio data is 1:

[0191] If the code corresponding to the CH4 / H2 ratio data is 0 or 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is arc discharge;

[0192] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is arc discharge and overheating;

[0193] When the code corresponding to the C2H2 / C2H4 ratio data is 2:

[0194] If the code corresponding to the CH4 / H2 ratio data is 0 or 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is low-energy discharge;

[0195] If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is low-energy discharge and overheating.

[0196] In the embodiments of the present disclosure, Figure 4 As shown, the system further includes: a second judgment module 500;

[0197] The second determination module 500 is specifically used for:

[0198] Obtaining the operating data of the 500kV transformer, wherein the operating data includes: oil temperature, winding temperature, core and clamp grounding current, cooler cooling water flow, cooler cooling water pressure, conservator oil level, bushing capacitance and dielectric loss, and chromatographic data;

[0199] Determine whether each operating data is greater than its corresponding alarm threshold. If so, an alarm is issued.

[0200] In the embodiments of the present disclosure, Figure 5 As shown, the system further includes: a third determination module 600;

[0201] The third determination module 600 is specifically used for:

[0202] Determine respectively a first mean value of each operation data within a first preset time length and a second mean value of each operation data within a second preset time length;

[0203] Determine the difference between the first mean and the second mean of each running data respectively;

[0204] It is determined whether the 500 kV transformer is faulty based on the difference.

[0205] In the embodiments of the present disclosure, Figure 6 As shown, the system further includes: a third judgment module 700;

[0206] The third determination module 700 is specifically used for:

[0207] When the 500kV transformer is a double-winding transformer:

[0208] Obtain the line voltage and phase current on the high-voltage side and the line voltage and phase current on the low-voltage side of the 500kV transformer, and determine the real-time apparent power of the 500kV transformer according to the line voltage and phase current on the high-voltage side and the line voltage and phase current on the low-voltage side;

[0209] Determine whether the real-time apparent power of the 500kV transformer is greater than the rated apparent power. If so, determine that the 500kV transformer has an overload operation fault and issue an alarm;

[0210] When the 500kV transformer is an autotransformer:

[0211] Obtaining the line voltage and phase current and the rated current of the common winding on the high-voltage side of the 500kV transformer, and determining the real-time apparent power of the 500kV transformer according to the line voltage and phase current and the rated current of the common winding on the high-voltage side;

[0212] Determine whether the real-time apparent power of the 500kV transformer is greater than the rated apparent power. If so, determine that the 500kV transformer has an overload operation fault and issue an alarm.

[0213] In the embodiments of the present disclosure, Figure 7 As shown, the system further includes: a fourth judgment module 800;

[0214] The fourth determination module 800 is specifically used for:

[0215] Determine whether the operating status of the 500kV transformer satisfies the first preset condition, the second preset condition, the third preset condition and the fourth preset condition; if so, determine that the 500kV transformer has a cooler oil flow or water flow complete interruption fault, and control the 500kV transformer to trip;

[0216] The first preset condition includes: the oil flow of oil pump No. 1 is interrupted, the oil flow of oil pump No. 2 is interrupted, the oil flow of oil pump No. 3 is interrupted, or the water flow of cooler No. 1 is interrupted, the water flow of cooler No. 2 is interrupted, and the water flow of cooler No. 3 is interrupted;

[0217] The second preset condition includes: the oil temperature switch value of the 500kV transformer is greater than or equal to 70°C, or the oil temperature analog value of the 500kV transformer is greater than or equal to 70°C;

[0218] The third preset condition includes: the main transformer oil temperature switch value in the non-electrical protection device is greater than 75°C, and the main transformer oil temperature switch value in the non-electrical protection device is less than or equal to 75°C, or the cold control power failure fixed delay is 3600s.

[0219] The fourth preset condition includes: the main transformer high-voltage side disconnector is in the closed position, the soft pressure plate and the hard pressure plate are in operation, and the cold control power failure protection delay is 1200s.

[0220] In the embodiments of the present disclosure, Figure 8 As shown, the system further includes: an information sending module 900;

[0221] The information sending module 900 is specifically used for:

[0222] When the 500kV transformer fails, the fault information is pushed to the information receiving device of the staff.

[0223] In summary, the 500kV transformer status monitoring system proposed in this embodiment can realize transformer live status monitoring, timely discover hidden dangers in equipment, formulate corresponding treatment measures for hidden dangers, shorten transformer maintenance time, and improve transformer maintenance quality.

[0224] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0225] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0226] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A 500kV transformer status monitoring method, characterized in that: The method comprises: When the chromatogram online data of the 500 kV transformer meets the first preset condition, acquiring the three ratio data of the transformer; Determine the codes corresponding to the three ratio data respectively according to the gas ratio range to which the three ratio data of the transformer belong; Determine the fault type of the 500kV transformer according to the codes corresponding to the three ratio data; The three ratio data include: C2H2 / C2H4 ratio data, CH4 / H2 ratio data, and C2H4 / C2H6 ratio data.

2. The method according to claim 1, characterized in that When the chromatogram online data of the 500 kV transformer meets the first preset condition, before obtaining the three ratio data of the transformer, the method further includes: Screening out each test data that is greater than its corresponding threshold value in the chromatogram online data of the 500kV transformer; Determine the absolute gas production rate corresponding to each test data; Based on the absolute gas production rate corresponding to each test data, the change trend of the chromatogram online data of the 500kV transformer is analyzed; The first preset condition includes: There is a deviation between the chromatogram online data of the 500kV transformer and the chromatogram offline data of the 500kV transformer, and the change trend of the chromatogram online data of the 500kV transformer is consistent.

3. The method according to claim 2, characterized in that The step of respectively determining the codes corresponding to the three ratio data according to the gas ratio range to which the three ratio data of the transformer belong comprises: When the C2H2 / C2H4 ratio data belongs to the preset first gas ratio range, the code corresponding to the C2H2 / C2H4 ratio data is 0; When the C2H2 / C2H4 ratio data belongs to the preset gas ratio second range or third range, the code corresponding to the C2H2 / C2H4 ratio data is 1; When the C2H2 / C2H4 ratio data belongs to the preset fourth gas ratio range, the code corresponding to the C2H2 / C2H4 ratio data is 2; When the CH4 / H2 ratio data belongs to the preset first gas ratio range, the code corresponding to the CH4 / H2 ratio data is 1; When the CH4 / H2 ratio data belongs to the preset second gas ratio range, the code corresponding to the CH4 / H2 ratio data is 0; When the CH4 / H2 ratio data belongs to the preset gas ratio third range or fourth range, the code corresponding to the CH4 / H2 ratio data is 2; When the C2H4 / C2H6 ratio data belongs to the preset gas ratio first range or second range, the code corresponding to the C2H4 / C2H6 ratio data is 0; When the C2H4 / C2H6 ratio data belongs to the preset third range of gas ratios, the code corresponding to the C2H4 / C2H6 ratio data is 1; When the C2H4 / C2H6 ratio data belongs to the preset fourth range of gas ratios, the code corresponding to the C2H4 / C2H6 ratio data is 2.

4. The method according to claim 3, characterized in that The determining the fault type of the 500kV transformer according to the codes corresponding to the three ratio data respectively includes: When the code corresponding to the C2H2 / C2H4 ratio data is 0: If the code corresponding to the CH4 / H2 ratio data is 0 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is the first low-temperature overheating; If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is the second low temperature overheating; If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 1, the fault type of the 500kV transformer is medium temperature overheating; If the code corresponding to the CH4 / H2 ratio data is 0, 1 or 2 and the code corresponding to the C2H4 / C2H6 ratio data is 2, the fault type of the 500kV transformer is high temperature overheating; If the code corresponding to the CH4 / H2 ratio data is 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0, the fault type of the 500kV transformer is partial discharge; When the code corresponding to the C2H2 / C2H4 ratio data is 1: If the code corresponding to the CH4 / H2 ratio data is 0 or 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is arc discharge; If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is arc discharge and overheating; When the code corresponding to the C2H2 / C2H4 ratio data is 2: If the code corresponding to the CH4 / H2 ratio data is 0 or 1 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is low-energy discharge; If the code corresponding to the CH4 / H2 ratio data is 2 and the code corresponding to the C2H4 / C2H6 ratio data is 0 or 1 or 2, the fault type of the 500kV transformer is low-energy discharge and overheating.

5. The method according to claim 4, characterized in that The method further comprises: Obtaining the operating data of the 500kV transformer, wherein the operating data includes: oil temperature, winding temperature, core and clamp grounding current, cooler cooling water flow, cooler cooling water pressure, conservator oil level, bushing capacitance and dielectric loss, and chromatographic data; Determine whether each operating data is greater than its corresponding alarm threshold. If so, an alarm is issued.

6. The method according to claim 5, characterized in that The method further comprises: Determine respectively a first mean value of each operation data within a first preset time length and a second mean value of each operation data within a second preset time length; Determine the difference between the first mean and the second mean of each running data respectively; It is determined whether the 500 kV transformer is faulty based on the difference.

7. The method according to claim 6, characterized in that The method further comprises: When the 500kV transformer is a double-winding transformer: Obtain the line voltage and phase current on the high-voltage side and the line voltage and phase current on the low-voltage side of the 500kV transformer, and determine the real-time apparent power of the 500kV transformer according to the line voltage and phase current on the high-voltage side and the line voltage and phase current on the low-voltage side; Determine whether the real-time apparent power of the 500kV transformer is greater than the rated apparent power. If so, determine that the 500kV transformer has an overload operation fault and issue an alarm; When the 500kV transformer is an autotransformer: Obtaining the line voltage and phase current and the rated current of the common winding on the high-voltage side of the 500kV transformer, and determining the real-time apparent power of the 500kV transformer according to the line voltage and phase current and the rated current of the common winding on the high-voltage side; Determine whether the apparent power of the 500kV transformer is greater than the rated apparent power. If so, determine that the 500kV transformer has an overload operation fault and issue an alarm.

8. The method according to claim 7, characterized in that The method further comprises: Determine whether the operating status of the 500kV transformer satisfies the first preset condition, the second preset condition, the third preset condition and the fourth preset condition; if so, determine that the 500kV transformer has a cooler oil flow or water flow complete interruption fault, and control the 500kV transformer to trip; The first preset condition includes: the oil flow of oil pump No. 1 is interrupted, the oil flow of oil pump No. 2 is interrupted, the oil flow of oil pump No. 3 is interrupted, or the water flow of cooler No. 1 is interrupted, the water flow of cooler No. 2 is interrupted, and the water flow of cooler No. 3 is interrupted; The second preset condition includes: the oil temperature switch value of the 500kV transformer is greater than or equal to 70°C, or the oil temperature analog value of the 500kV transformer is greater than or equal to 70°C; The third preset condition includes: the main transformer oil temperature switch value in the non-electrical protection device is greater than 75°C, and the main transformer oil temperature switch value in the non-electrical protection device is less than or equal to 75°C, or the cold control power failure fixed delay is 3600s. The fourth preset condition includes: the main transformer high-voltage side disconnector is in the closed position, the soft pressure plate and the hard pressure plate are in operation, and the cold control power failure protection delay is 1200s.

9. The method according to claim 8, characterized in that The method further comprises: When the 500kV transformer fails, the fault information is pushed to the information receiving device of the staff.

10. A 500kV transformer status monitoring system, characterized in that: The system comprises: An acquisition module, used for acquiring three ratio data of a 500 kV transformer when the chromatogram online data of the transformer meets a first preset condition; A first determination module, configured to determine the codes corresponding to the three ratio data respectively according to the gas ratio range to which the three ratio data of the transformer belong; A second determination module is used to determine the fault type of the 500kV transformer according to the codes corresponding to the three ratio data; The three ratio data include: C2H2 / C2H4 ratio data, CH4 / H2 ratio data, and C2H4 / C2H6 ratio data.

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