An alarm system for transformer winding temperature and core temperature

Abstract

The invention discloses an alarm system for transformer winding temperature and core temperature, relates to the field of electric power engineering, solves the problem that the current transformer winding and core alarm system cannot pre-judge the transformer winding and core temperature in advance, and the alarm system comprises a data acquisition module, a data processing module, a pre-alarm module and an alarm release module. The data acquisition module acquires basic transformer data, the data processing module processes the basic transformer data to obtain transformer overheat pre-judgment data, the pre-alarm module issues a pre-alarm based on the transformer overheat pre-judgment data and calculates the transformer early warning coefficient, and the alarm release module issues a transformer temperature alarm based on the pre-alarm data. The invention issues a pre-alarm by calculating the transformer overheat pre-judgment data and setting a threshold value. Compared with a single temperature alarm, the invention greatly improves the operating safety of the transformer and extends the service life of the transformer.

Description

Technical Field

[0001] The invention belongs to the field of electric power engineering and relates to a temperature alarm technology, in particular to an alarm system for transformer winding temperature and iron core temperature. Background Art

[0002] A transformer is an electrical device that works based on the principle of electromagnetic induction and is used for voltage conversion in power systems. The transformer winding is composed of wire coils. The high-voltage winding and the low-voltage winding are used to transmit input and output voltages respectively. When an AC current flows through the input winding, the generated magnetic field will pass through the iron core and act on the output winding through magnetic induction. The wires of the winding are usually wrapped with high-insulation materials to ensure that the current will not short-circuit or leak. The iron core is the supporting structure of the transformer and is usually made of iron. The function of the iron core is to increase the magnetic induction intensity and reduce the magnetic resistance of the magnetic circuit, thereby improving the energy conversion efficiency.

[0003] At present, the alarm method for transformer winding temperature and core temperature is mostly to obtain the temperature data of the resistor winding and core for alarm. It is impossible to pre-judge the winding and core temperature of the transformer in advance. When the alarm is issued, the temperature of the transformer winding and core is often too high. Therefore, we propose an alarm system for transformer winding temperature and core temperature. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an alarm system for transformer winding temperature and core temperature. The present invention is based on obtaining basic transformer data, calculating a transformer overheating reference value through the transformer basic data, and performing a threshold judgment on the transformer overheating reference value to pre-alarm the transformer. At the same time, the temperature values ​​of the transformer winding and the core are monitored in real time, and a transformer early warning coefficient is obtained in combination with the transformer overheating reference value calculation, a threshold judgment is performed on the transformer early warning coefficient, and an alarm is issued in time for transformers with temperature alarm levels.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: an alarm system for transformer winding temperature and core temperature comprises:

[0006] Data acquisition module: respectively acquires power data of the transformer under working state, transformer working data, environmental data of the environment where the transformer is located, and insulation layer data of the transformer, and obtains basic data of the transformer by integrating power data, transformer working data, environmental data, and insulation layer data of the transformer;

[0007] Data processing module: respectively calculates the transformer load rate, the transformer insulation layer insulation reference value and the transformer overheat reference value, and sets a threshold value for the transformer overheat reference value to judge, and obtains overheat pre-judgment data;

[0008] Pre-warning module: issues pre-warning based on transformer overheating pre-judgment data and calculates transformer early warning coefficient;

[0009] Alarm release module: obtains alarm classification data according to the transformer early warning coefficient, and releases alarms according to the alarm classification data;

[0010] It also includes a server, which is connected to the data acquisition module, the data processing module, the pre-warning module and the alarm issuing module respectively.

[0011] Furthermore, the data acquisition module acquires basic transformer data, as follows:

[0012] The data acquisition module includes a power data unit, a core component unit, an environment detection unit and an insulation layer unit;

[0013] The power data unit obtains the power data of the transformer under working status, as follows:

[0014] The current sensor is used to obtain the real-time current data of the transformer under working condition, and the voltage sensor is used to obtain the real-time voltage data of the transformer under working condition;

[0015] The real-time current data and voltage data of the transformer under working condition are calculated by the power calculation formula to obtain power data;

[0016] The core component unit obtains transformer operating data;

[0017] The environmental monitoring unit obtains environmental data of the environment where the transformer is located;

[0018] The insulation layer unit obtains the insulation layer data of the transformer;

[0019] The basic data of transformer consists of power data, transformer working data, environmental data and transformer insulation layer data.

[0020] Furthermore, the core component unit obtains transformer operating data, as follows:

[0021] The transformer winding temperature is obtained in real time through the fluorescent fiber optic temperature detector, and the transformer core temperature is obtained in real time through the fluorescent fiber optic temperature detector;

[0022] The transformer winding is divided into an input side winding and an output side winding. The temperature values ​​of the input side winding and the output side winding are obtained respectively by a fluorescent fiber optic temperature sensor. The input side temperature value and the output side temperature value are calculated by a winding temperature calculation formula to obtain the transformer winding temperature.

[0023] Obtain the value of the cumulative working time of the transformer core, obtain the value of the designed working time of the transformer core, and calculate the value of the cumulative working time of the transformer core and the value of the designed working time of the transformer core through the core calculation formula to obtain a reference value of the transformer core consumption;

[0024] The cumulative number of short-circuit times of the transformer is obtained, and the transformer working data is formed by integrating the transformer winding temperature, transformer core temperature, transformer core consumption reference value and the cumulative number of short-circuit times of the transformer.

[0025] Furthermore, the environment monitoring unit and the insulation layer unit obtain environment data and insulation layer data, as follows:

[0026] The environmental monitoring unit obtains the temperature value of the environment where the transformer is located through the temperature sensor, and obtains the humidity value of the environment where the transformer is located through the humidity sensor. The temperature value and humidity value of the environment where the transformer is located constitute the environmental data;

[0027] The insulation layer unit obtains the electrical strength value of the transformer insulation layer through an insulation tester, obtains the dielectric constant of the insulation layer, and obtains the thermal expansion coefficient of the transformer insulation layer through a thermal expansion meter as the heat resistance data of the insulation layer;

[0028] The insulation layer data is obtained by combining the electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer.

[0029] Furthermore, the data processing module processes the basic data of the transformer as follows:

[0030] The data processing module includes a load calculation unit, an insulation calculation unit and an overheat prediction unit;

[0031] The load calculation unit calculates the transformer load rate based on the power data, as follows:

[0032] Obtain power data based on transformer basic data to obtain the rated output capacity power of the transformer;

[0033] The transformer load rate is obtained by calculating the power data and the rated output capacity power of the transformer through the load calculation formula;

[0034] The insulation calculation unit calculates the insulation reference value of the transformer insulation layer according to the insulation layer data, as follows:

[0035] Obtain the electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer according to the transformer basic data;

[0036] The electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer are calculated using the insulation coefficient calculation formula to obtain the insulation reference value of the transformer insulation layer.

[0037] Furthermore, the overheat prediction unit obtains transformer overheat pre-judgment data, which is as follows:

[0038] According to the basic data of the transformer, the temperature and humidity values ​​of the environment where the transformer is located, the standard working temperature and humidity values ​​of the transformer, the load rate of the transformer, and the insulation reference value of the insulation layer of the transformer are obtained;

[0039] The transformer overheat reference value Gy is calculated by the overheat pre-judgment calculation formula using the temperature value, humidity value, transformer standard operating temperature value, transformer standard operating humidity value, transformer load rate and transformer insulation layer insulation reference value of the transformer environment.

[0040] Furthermore, the overheat prediction unit makes a judgment based on the overheat pre-judgment data, as follows:

[0041] Obtain the transformer standard load rate, transformer insulation layer insulation standard value, transformer standard operating temperature value and transformer standard operating humidity value;

[0042] The transformer standard load rate, transformer insulation layer insulation standard value, transformer standard operating temperature value and transformer standard operating humidity value are calculated through the overheating pre-judgment calculation formula to obtain the transformer overheating reference value threshold data Gy1;

[0043] According to the transformer overheat reference value Gy and the transformer overheat reference value threshold data Gy1, the transformer overheat pre-judgment data is obtained as follows:

[0044] When Gy≥Gy1, it is judged as a warning transformer;

[0045] When 0<Gy<Gy1, it is judged as a normal transformer;

[0046] Overheat pre-judgment data is obtained by judging the transformer overheat reference value.

[0047] Furthermore, the pre-warning module issues a pre-warning and calculates the transformer pre-warning coefficient, as follows;

[0048] The pre-warning module includes a pre-warning unit and a warning coefficient unit;

[0049] The pre-alarm unit issues a pre-alarm based on the transformer overheat pre-judgment data, as follows:

[0050] For the pre-alarm transformer, the first alarm indicator light flashes to issue a pre-alarm;

[0051] For normal transformers, maintain the normal operation of the transformer;

[0052] The warning coefficient unit calculates the transformer warning coefficient as follows:

[0053] According to the basic data of the transformer, the transformer winding temperature, the transformer core temperature, the transformer core consumption reference value and the cumulative short-circuit times of the transformer are obtained to obtain the transformer overheating reference value;

[0054] The transformer early warning coefficient By is calculated by the transformer early warning calculation formula using the transformer winding temperature, transformer core temperature, transformer core consumption reference value, transformer cumulative short circuit times, and transformer overheat reference value.

[0055] Furthermore, the alarm issuing module issues a transformer temperature alarm according to the pre-alarm data, as follows:

[0056] The alarm release module includes an alarm classification unit and an alarm release unit;

[0057] The alarm classification unit obtains the alarm classification data according to the transformer early warning coefficient, as follows:

[0058] Obtain the standard operating temperature of the transformer core, obtain the standard operating temperature of the transformer winding, and obtain the transformer overheating reference value threshold data;

[0059] The transformer core standard operating temperature, transformer winding standard operating temperature and transformer overheat reference value threshold data are calculated by using the alarm coefficient threshold calculation formula to obtain the transformer early warning coefficient threshold data By1;

[0060] Obtain the transformer warning coefficient By, and classify the transformer warning coefficient By1 according to the transformer warning coefficient threshold data, as follows:

[0061] When By≥By1, it is determined that the transformer is at the temperature warning level;

[0062] When By<By1, it is judged that the transformer is at a normal temperature level;

[0063] The transformer warning coefficient is judged by the transformer warning coefficient threshold data to obtain the alarm classification data.

[0064] Furthermore, the alarm issuing unit issues a transformer temperature alarm, as follows:

[0065] For transformers at the temperature warning level, the second warning indicator flashes and the transformer stops working;

[0066] For a transformer at a normal temperature level, the second alarm indicator light does not flash and the transformer operates normally.

[0067] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0068] 1. The present invention obtains a variety of different data to make transformer alarm judgments. Compared with simply using the temperature of the transformer winding and core for alarm, the accuracy of the alarm is greatly improved;

[0069] 2. The present invention calculates transformer overheating pre-judgment data and sets a threshold value for pre-warning. Compared with a single temperature alarm, it greatly improves the operating safety of the transformer and extends the service life of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0071] Figure 1 is the overall system block diagram of the present invention;

[0072] Figure 2 It is a diagram of the implementation steps of the present invention;

[0073] Figure 3 Schematic diagram of transformer winding and core in the present invention. DETAILED DESCRIPTION

[0074] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0075] Embodiment 1

[0076] See also Figure 1 and Figure 2 , the present invention provides a technical solution: an alarm system for transformer winding temperature and core temperature, comprising a data acquisition module, a data processing module, a pre-alarm module, an alarm publishing module and a reference data subunit, the data acquisition module, the data processing module, the pre-alarm module and the alarm publishing module are respectively connected to a server;

[0077] The reference data subunit includes the transformer manufacturer's document and the transformer historical work log. The data involved in the transformer manufacturer's document include the dielectric constant of the transformer insulation layer, the transformer core design working time value, the transformer's rated output capacity power, the transformer's working temperature value and working humidity value, the transformer's rated working load rate, the transformer insulation layer insulation value, the transformer core working temperature and the winding working temperature. The transformer historical work log includes the transformer core cumulative working time value and the transformer cumulative short circuit times;

[0078] The data acquisition module acquires basic data of the transformer;

[0079] The data acquisition module includes a power data unit, a core component unit, an environment detection unit and an insulation layer unit. The power data unit acquires power data under the working state of the transformer, the core component unit acquires transformer working data, the environment monitoring unit acquires environmental data of the environment where the transformer is located, and the insulation layer unit acquires insulation layer data of the transformer. The power data unit includes a current sensor and a voltage sensor, the core component unit includes a fluorescent optical fiber temperature meter and a transformer historical work log, the environment monitoring unit includes a temperature sensor and a humidity sensor, and the insulation layer unit includes an insulation detector and a thermal expansion meter;

[0080] The power data unit obtains the power data of the transformer under working status, as follows:

[0081] The current sensor is used to obtain the real-time current data of the transformer under working condition, and the voltage sensor is used to obtain the real-time voltage data of the transformer under working condition;

[0082] The real-time current data and voltage data of the transformer under working condition are calculated by the power calculation formula to obtain power data;

[0083] The reference formula for power calculation is: Dl=Iy*Vy;

[0084] Wherein, D1 is the real-time power data of the transformer under working condition, and Vy is the real-time voltage data of the transformer under working condition;

[0085] It should be noted here that: in this embodiment, the power working data is the real-time working power of the transformer;

[0086] The core component unit obtains the transformer working data, as follows:

[0087] See also Figure 3 , the transformer winding temperature is obtained in real time through the fluorescent fiber optic temperature detector, and the transformer core temperature is obtained in real time through the fluorescent fiber optic temperature detector;

[0088] The transformer winding is divided into an input side winding and an output side winding. The temperature values ​​of the input side winding and the output side winding are obtained respectively by a fluorescent fiber optic temperature sensor. The input side temperature value and the output side temperature value are calculated by a winding temperature calculation formula to obtain the transformer winding temperature.

[0089] The reference formula for calculating winding temperature is:

[0090] Among them, Rz is the transformer winding temperature, Wr is the input side temperature value, and Wc is the output side temperature value;

[0091] It should be noted that: during the temperature measurement of the transformer winding, the input side and the output side are powered on at the same time, and the temperature difference between different positions of the winding coil due to the power-on time is negligible;

[0092] Obtain the value of the transformer core's cumulative working time through the transformer's historical working log, obtain the value of the transformer core's designed working time through the transformer manufacturer's document, and calculate the transformer core's cumulative working time and the transformer core's designed working time using the core calculation formula to obtain a transformer core consumption reference value;

[0093] The reference calculation formula for transformer core is:

[0094] Among them, Tx is the reference value of transformer core consumption, Lg is the cumulative working time value of the transformer core, Sg is the designed working time value of the transformer core, a1 is the set proportional coefficient and a1>0;

[0095] Obtain the cumulative number of short circuits of the transformer through the transformer historical work log;

[0096] The transformer working data is composed of the transformer winding temperature, transformer core temperature, transformer core consumption reference value and the transformer cumulative short circuit times;

[0097] The environmental monitoring unit obtains the temperature value of the environment where the transformer is located through the temperature sensor, obtains the humidity value of the environment where the transformer is located through the humidity sensor, and obtains the environmental data by integrating the temperature value and humidity value of the environment where the transformer is located;

[0098] The insulation layer unit obtains the insulation layer data of the transformer, as follows:

[0099] The electrical strength value of the transformer insulation layer is obtained through an insulation tester, the dielectric constant of the insulation layer is obtained through the transformer manufacturer's documents, and the thermal expansion coefficient of the transformer insulation layer is obtained through a thermal expansion meter as the heat resistance data of the insulation layer;

[0100] The insulation layer data is obtained by integrating the electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer;

[0101] The data acquisition module integrates power data, transformer working data, environmental data and insulation layer data to obtain transformer basic data, and transmits the transformer basic data to the data processing module and the early warning module;

[0102] What needs to be explained here is that the dielectric constant is a physical quantity that describes the material's ability to respond to an electric field. It represents the material's electrical polarization ability under an external electric field, that is, the degree of separation of positive and negative charges in the material.

[0103] The data processing module processes the basic data of the transformer to obtain the transformer overheating pre-judgment data;

[0104] The data processing module includes a load calculation unit, an insulation calculation unit and an overheat prediction unit. The load calculation unit calculates the transformer load rate according to the power data, the insulation calculation unit calculates the insulation reference value of the transformer insulation layer according to the insulation layer data, and the load calculation unit calculates the transformer overheat reference value and sets a threshold for judgment to obtain overheat pre-judgment data.

[0105] The load calculation unit calculates the transformer load rate based on the power data, as follows:

[0106] Obtain power data based on transformer basic data and obtain the rated output capacity power of the transformer through the transformer manufacturer's documents;

[0107] The transformer load rate is obtained by calculating the power data and the rated output capacity power of the transformer through the load calculation formula;

[0108] The specific reference for the load calculation formula is:

[0109] Among them, F l is the transformer load factor, D l is the power data, and Eg is the rated output capacity power of the transformer;

[0110] The insulation calculation unit calculates the insulation reference value of the transformer insulation layer according to the insulation layer data, as follows:

[0111] Obtain the electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer according to the transformer basic data;

[0112] The insulation reference value of the transformer insulation layer is obtained by calculating the electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer through the insulation coefficient calculation formula;

[0113] The specific reference for the insulation coefficient calculation formula is:

[0114] Wherein, Jy is the insulation reference value of the transformer insulation layer, Jd is the dielectric constant of the transformer insulation layer, Nr is the heat resistance data of the insulation layer, Dq is the electrical strength value of the transformer insulation layer, a2 is the set electrical strength value proportional coefficient and a2>0;

[0115] It should be noted here that the insulation reference value of the transformer insulation layer here refers to the insulation layer between the transformer winding and the iron core. The larger the insulation reference value here, the better the insulation performance of the insulation layer, and the higher the electric field strength it can withstand;

[0116] The load calculation unit calculates the transformer overheat reference value as follows:

[0117] According to the basic data of the transformer, the temperature and humidity values ​​of the environment where the transformer is located, the standard working temperature and humidity values ​​of the transformer, the load rate of the transformer, and the insulation reference value of the insulation layer of the transformer are obtained;

[0118] The transformer standard temperature value and standard humidity value obtained here are the transformer operating temperature value and operating humidity value set in the transformer manufacturer's document;

[0119] The temperature value, humidity value, standard operating temperature value, standard operating humidity value, load factor and insulation reference value of the transformer insulation layer are calculated by the overheating pre-judgment calculation formula to obtain the transformer overheating reference value Gy;

[0120] The specific reference for the overheating pre-judgment calculation formula is as follows:

[0121] Among them, Gy is the transformer overheating reference value, F l is the transformer load rate, Jy is the transformer insulation layer insulation reference value, Ws is the temperature value of the transformer environment, Ss is the humidity value of the transformer environment, Wb is the transformer standard operating temperature value, Sb is the transformer standard operating humidity value, a3 and a4 are set proportional coefficients, and a3 and a4 are both greater than 0;

[0122] Obtain the transformer standard load rate, transformer insulation layer insulation standard value, transformer standard operating temperature value and transformer standard operating humidity value;

[0123] The transformer standard load rate, transformer insulation layer insulation standard value, transformer standard temperature value and standard humidity value here are the transformer rated working load rate, transformer insulation layer insulation value, transformer working temperature value and working humidity value set in the transformer manufacturer's document;

[0124] The transformer standard load rate, transformer insulation layer insulation standard value, transformer standard operating temperature value and transformer standard operating humidity value are calculated through the overheating pre-judgment calculation formula to obtain the transformer overheating reference value threshold data Gy1;

[0125] According to the transformer overheat reference value Gy and the transformer overheat reference value threshold data Gy1, the transformer overheat pre-judgment data is obtained as follows:

[0126] When Gy≥Gy1, it is judged as a warning transformer;

[0127] When 0<Gy<Gy1, it is judged as a normal transformer;

[0128] The transformer overheat pre-judgment data is obtained from the above judgment results;

[0129] The data processing module transmits the transformer overheat pre-judgment data, the transformer overheat reference value and the transformer overheat reference value threshold data to the early warning module;

[0130] The pre-alarm module issues a pre-alarm based on the transformer overheat pre-judgment data and calculates the transformer early warning coefficient;

[0131] The pre-alarm module includes a pre-alarm unit and a pre-alarm coefficient unit. The pre-alarm unit issues a pre-alarm based on the transformer overheat pre-judgment data. The pre-alarm coefficient unit calculates the transformer pre-alarm coefficient. The pre-alarm unit includes a first alarm indicator light and a plurality of fluorescent optical fiber temperature detectors.

[0132] The pre-alarm unit issues a pre-alarm based on the transformer overheat pre-judgment data, as follows:

[0133] For the pre-alarm transformer, the first alarm indicator light flashes, and the temperature of the transformer winding and core is detected simultaneously through multiple fluorescent fiber optic temperature detectors, which increases the monitoring intensity of the transformer winding and core and reduces the load of the transformer;

[0134] For normal transformers, maintain the normal operation of the transformer;

[0135] The warning coefficient unit calculates the transformer warning coefficient as follows:

[0136] According to the basic data of the transformer, the transformer winding temperature, the transformer core temperature, the transformer core consumption reference value and the cumulative short-circuit times of the transformer are obtained to obtain the transformer overheating reference value;

[0137] The transformer early warning coefficient By is calculated by using the transformer early warning calculation formula to obtain the transformer winding temperature, transformer core temperature, transformer core consumption reference value, transformer cumulative short circuit times, and transformer overheat reference value;

[0138] The specific reference of transformer early warning formula is:

[0139] Among them, By is the transformer warning coefficient, Wt is the transformer core temperature, Rz is the transformer winding temperature, Cs is the cumulative number of transformer short circuits, Tx is the transformer core consumption reference value, Gy is the transformer overheating reference value, b1 and b2 are the set proportional coefficients, and b1 and b2 are both greater than 0;

[0140] The pre-alarm module transmits the transformer warning coefficient as pre-alarm data to the alarm issuing module;

[0141] The alarm release module releases transformer temperature alarms based on pre-alarm data;

[0142] The alarm issuing module includes an alarm grading unit and an alarm issuing unit. The alarm grading unit obtains alarm grading data according to the transformer early warning coefficient. The alarm issuing unit issues an alarm according to the alarm grading data. The alarm issuing unit includes a second alarm indicator light.

[0143] The alarm classification unit obtains the alarm classification data according to the transformer early warning coefficient, as follows:

[0144] Obtain the standard operating temperature of the transformer core, obtain the standard operating temperature of the transformer winding, and obtain the transformer overheating reference value threshold data;

[0145] The transformer core standard operating temperature and winding standard operating temperature obtained here are the transformer core operating temperature and winding operating temperature set in the transformer manufacturer's documents;

[0146] The transformer core standard operating temperature, transformer winding standard operating temperature and transformer overheat reference value threshold data are calculated by using the alarm coefficient threshold calculation formula to obtain the transformer early warning coefficient threshold data By1;

[0147] The specific reference formula for calculating the alarm coefficient threshold is: Bv1 = Wt1 + Rz1 + Gv1*b2;

[0148] Among them, By1 is the transformer warning coefficient threshold data, Wt1 is the standard operating temperature of the transformer core, Rz1 is the standard operating temperature of the transformer winding, Gy1 is the transformer overheating reference value threshold data, b2 is the set proportional coefficient and b2>0;

[0149] Obtain the transformer warning coefficient By, and classify the transformer warning coefficient By1 according to the transformer warning coefficient threshold data, as follows:

[0150] When By≥By1, it is judged that the ground is at the temperature warning level;

[0151] When By<By1, it is judged that the ground is at a normal temperature level;

[0152] The transformer warning coefficient will be judged by the transformer warning coefficient threshold data to obtain the alarm classification data;

[0153] The alarm issuing unit issues alarms according to the alarm classification data, as follows:

[0154] For transformers at the temperature warning level, the second warning indicator flashes and the rheostat stops working;

[0155] For a transformer at a normal temperature level, the second alarm indicator light does not flash and the rheostat operates normally.

[0156] In this application, if corresponding calculation formulas appear, the above calculation formulas are all dimensionless and take their numerical calculations. The weight coefficients, proportional coefficients and other coefficients in the formulas are set to a result value obtained by quantifying each parameter. The size of the weight coefficient and the proportional coefficient can be determined as long as it does not affect the proportional relationship between the parameter and the result value.

[0157] Embodiment 2

[0158] Based on another concept of the same invention, a method for warning transformer winding temperature and core temperature is now proposed, comprising the following steps:

[0159] Step S1: The data acquisition module acquires basic data of the transformer;

[0160] Step S11: Obtaining power data of the transformer in working state, as follows:

[0161] Step S111: obtaining real-time current data of the transformer in a working state through a current sensor, and obtaining real-time voltage data of the transformer in a working state through a voltage sensor;

[0162] Step S112: Calculate the real-time current data and voltage data of the transformer under working state by using the power calculation formula to obtain power data;

[0163] Step S12: Obtain transformer operating data, as follows:

[0164] Step S121: obtaining the transformer winding temperature in real time through the fluorescent optical fiber temperature detector, and obtaining the transformer core temperature in real time through the fluorescent optical fiber temperature detector;

[0165] Step S122: the transformer winding is divided into an input side winding and an output side winding, the temperature value of the input side winding and the temperature value of the output side winding are respectively obtained by a fluorescent fiber optic temperature sensor, and the input side temperature value and the output side temperature value are calculated by a winding temperature calculation formula to obtain the transformer winding temperature;

[0166] Step S123: Obtain the value of the cumulative working time of the transformer core, obtain the value of the designed working time of the transformer core, and calculate the value of the cumulative working time of the transformer core and the value of the designed working time of the transformer core through the core calculation formula to obtain a reference value of transformer core consumption;

[0167] Step S124: Obtain the cumulative number of short circuits of the transformer;

[0168] Step S125: The transformer working data is formed by integrating the transformer winding temperature, the transformer core temperature, the transformer core consumption reference value and the transformer cumulative short circuit times;

[0169] Step S13: obtaining a temperature value of the environment where the transformer is located through a temperature sensor, and obtaining a humidity value of the environment where the transformer is located through a humidity sensor, and the temperature value and humidity value of the environment where the transformer is located constitute environmental data;

[0170] Step S14: Obtain the insulation layer data of the transformer, as follows:

[0171] Step S141: obtaining the electrical strength value of the transformer insulation layer through an insulation tester, obtaining the dielectric constant of the insulation layer, and obtaining the thermal expansion coefficient of the transformer insulation layer through a thermal expansion meter as the heat resistance data of the insulation layer;

[0172] Step S142: Insulation layer data is obtained by integrating the electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer;

[0173] Step S145: integrating power data, transformer working data, environmental data and insulation layer data to obtain transformer basic data, and transmitting the transformer basic data to the data processing module and the early warning module;

[0174] Step S2: Processing transformer basic data to obtain transformer overheating pre-judgment data;

[0175] Step S21: Calculate the transformer load rate according to the power data, as follows:

[0176] Step S211: acquiring power data according to basic data of the transformer, and acquiring the rated output capacity power of the transformer;

[0177] Step S212: Calculate the transformer load rate by using the load calculation formula using the power data and the rated output capacity power of the transformer;

[0178] Step S22: Calculate the insulation reference value of the transformer insulation layer according to the insulation layer data, as follows:

[0179] Step S221: obtaining the electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer according to the transformer basic data;

[0180] Step S222: Calculate the insulation reference value of the transformer insulation layer by using the insulation coefficient calculation formula to obtain the electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer;

[0181] Step S23: Calculate the transformer overheat reference value, as follows:

[0182] Step S231: obtaining the temperature value and humidity value of the transformer environment according to the transformer basic data, obtaining the standard operating temperature value and standard operating humidity value of the transformer, obtaining the transformer load rate, and obtaining the insulation reference value of the transformer insulation layer;

[0183] Step S232: Calculate the transformer overheat reference value Gy by using the overheat pre-judgment calculation formula to calculate the transformer overheat reference value Gy.

[0184] Step S233: Obtaining the standard load rate of the transformer, the insulation standard value of the transformer insulation layer, the standard operating temperature value of the transformer, and the standard operating humidity value of the transformer;

[0185] Step S234: Calculate the transformer overheat reference value threshold data Gy1 by using the overheat pre-judgment calculation formula to obtain the transformer overheat reference value threshold data Gy1;

[0186] Step S235: determining and obtaining transformer overheat pre-determination data according to the transformer overheat reference value Gy and the transformer overheat reference value threshold data Gy1, as follows:

[0187] When Gy≥Gy1, it is judged as a warning transformer;

[0188] When 0<Gy<Gy1, it is judged as a normal transformer;

[0189] The above judgment results constitute transformer overheating pre-judgment data;

[0190] Step S3: issuing a pre-warning warning based on the transformer overheating pre-judgment data and calculating the transformer early warning coefficient;

[0191] Step S31: issuing a pre-alarm according to the transformer overheat pre-judgment data, as follows:

[0192] For the pre-alarm transformer windings and cores, the first alarm indicator light flashes, and multiple fluorescent fiber optic temperature detectors are used to simultaneously detect the temperature of the transformer windings and cores, thereby increasing the monitoring of the transformer windings and cores and reducing the load on the transformer;

[0193] For normal transformer windings and cores, maintain the normal operation of the transformer;

[0194] Step S31: Calculate the transformer warning coefficient, as follows:

[0195] Step S311: Obtain transformer winding temperature, transformer core temperature, transformer core consumption reference value and transformer cumulative short-circuit times according to transformer basic data, and obtain transformer overheat reference value;

[0196] Step S312: Calculate the transformer early warning coefficient By by using the transformer early warning calculation formula to calculate the transformer winding temperature, transformer core temperature, transformer core consumption reference value, transformer cumulative short circuit times, and transformer overheat reference value;

[0197] Step S313: Transmitting the transformer warning coefficient as pre-alarm data to the alarm issuing module;

[0198] Step S4: issuing a transformer temperature alarm according to the pre-alarm data;

[0199] Step S41: Acquire alarm classification data according to the transformer early warning coefficient, as follows:

[0200] Step S411: obtaining the standard operating temperature of the transformer core, obtaining the standard operating temperature of the transformer winding, and obtaining the transformer overheating reference value threshold data;

[0201] Step S412: Calculate the transformer early warning coefficient threshold data By1 by using the alarm coefficient threshold calculation formula to calculate the transformer core standard operating temperature, transformer winding standard operating temperature and transformer overheat reference value threshold data;

[0202] Step S413: Obtain the transformer warning coefficient By, and classify the transformer warning coefficient By1 according to the transformer warning coefficient threshold data, as follows:

[0203] When By≥By1, it is determined that the transformer is at the temperature warning level;

[0204] When By<By1, it is judged that the transformer is at a normal temperature level;

[0205] Step S414: judging the transformer warning coefficient by using the transformer warning coefficient threshold data to obtain warning classification data;

[0206] Step S42: issuing an alarm according to the alarm classification data, as follows:

[0207] Step S421: For a transformer at a temperature warning level, the second warning indicator light flashes and the transformer stops working;

[0208] Step S422: For the transformer at a normal temperature level, the second alarm indicator light does not flash and the transformer operates normally.

[0209] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An alarm system for transformer winding temperature and core temperature, characterized in that: include: Data acquisition module: respectively acquires power data of the transformer under working state, transformer working data, environmental data of the environment where the transformer is located, and insulation layer data of the transformer, and obtains basic data of the transformer by integrating power data, transformer working data, environmental data, and insulation layer data of the transformer; Data processing module: respectively calculates the transformer load rate, the transformer insulation layer insulation reference value and the transformer overheat reference value, and sets a threshold value for the transformer overheat reference value to judge, and obtains overheat pre-judgment data; Pre-warning module: issues pre-warning based on transformer overheating pre-judgment data and calculates transformer early warning coefficient; The warning coefficient unit calculates the transformer warning coefficient as follows: Obtain transformer winding temperature, transformer core temperature, transformer core consumption reference value, transformer cumulative short circuit times and transformer overheat reference value based on transformer basic data; The transformer early warning coefficient By is calculated by using the transformer early warning calculation formula to obtain the transformer winding temperature, transformer core temperature, transformer core consumption reference value, transformer cumulative short circuit times, and transformer overheat reference value; The specific reference of transformer early warning formula is: Among them, By is the transformer warning coefficient, Wt is the transformer core temperature, Rz is the transformer winding temperature, Cs is the cumulative number of transformer short circuits, Tx is the transformer core consumption reference value, Gy is the transformer overheating reference value, b1 and b2 are the set proportional coefficients, and b1 and b2 are both greater than 0; Alarm release module: obtains alarm classification data according to the transformer early warning coefficient, and releases alarms according to the alarm classification data; It also includes a server, which is connected to the data acquisition module, the data processing module, the pre-warning module and the alarm issuing module respectively.

2. The alarm system for transformer winding temperature and core temperature according to claim 1, characterized in that: The data acquisition module acquires basic data of the transformer, as follows: The data acquisition module includes a power data unit, a core component unit, an environment detection unit and an insulation layer unit; The power data unit obtains the power data of the transformer under working status, as follows: The current sensor is used to obtain the real-time current data of the transformer under working condition, and the voltage sensor is used to obtain the real-time voltage data of the transformer under working condition; The real-time current data and voltage data of the transformer under working condition are calculated by the power calculation formula to obtain power data; The core component unit obtains transformer operating data; The environmental monitoring unit obtains environmental data of the environment where the transformer is located; The insulation layer unit obtains the insulation layer data of the transformer; The basic data of transformer consists of power data, transformer working data, environmental data and transformer insulation layer data.

3. The alarm system for transformer winding temperature and core temperature according to claim 2, characterized in that: The core component unit obtains transformer working data, as follows: The transformer winding temperature is obtained in real time through the fluorescent fiber optic temperature detector, and the transformer core temperature is obtained in real time through the fluorescent fiber optic temperature detector; The transformer winding is divided into an input side winding and an output side winding. The temperature values ​​of the input side winding and the output side winding are obtained respectively by a fluorescent fiber optic temperature sensor. The input side temperature value and the output side temperature value are calculated by a winding temperature calculation formula to obtain the transformer winding temperature. Obtain the value of the cumulative working time of the transformer core, obtain the value of the designed working time of the transformer core, and calculate the value of the cumulative working time of the transformer core and the value of the designed working time of the transformer core through the core calculation formula to obtain a reference value of the transformer core consumption; The cumulative number of short-circuit times of the transformer is obtained, and the transformer working data is formed by integrating the transformer winding temperature, transformer core temperature, transformer core consumption reference value and the cumulative number of short-circuit times of the transformer.

4. The alarm system for transformer winding temperature and core temperature according to claim 2, characterized in that: The environment monitoring unit and the insulation layer unit obtain environment data and insulation layer data, specifically as follows: The environmental monitoring unit obtains the temperature value of the environment where the transformer is located through the temperature sensor, and obtains the humidity value of the environment where the transformer is located through the humidity sensor. The temperature value and the humidity value constitute the environmental data; The insulation layer unit obtains the electrical strength value of the transformer insulation layer through an insulation tester, obtains the dielectric constant of the insulation layer, and obtains the thermal expansion coefficient of the transformer insulation layer through a thermal expansion meter as the heat resistance data of the insulation layer; The insulation layer data is obtained by combining the electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer.

5. The alarm system for transformer winding temperature and core temperature according to claim 1, characterized in that: The data processing module processes the basic data of the transformer as follows: The data processing module includes a load calculation unit, an insulation calculation unit and an overheat prediction unit; The load calculation unit calculates the transformer load rate based on the power data, as follows: Obtain power data based on transformer basic data to obtain the rated output capacity power of the transformer; The transformer load rate is obtained by calculating the power data and the rated output capacity power of the transformer through the load calculation formula; The insulation calculation unit calculates the insulation reference value of the transformer insulation layer according to the insulation layer data, as follows: Obtain the electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer according to the transformer basic data; The electrical strength value, dielectric constant and heat resistance data of the transformer insulation layer are calculated using the insulation coefficient calculation formula to obtain the insulation reference value of the transformer insulation layer.

6. The alarm system for transformer winding temperature and core temperature according to claim 5, characterized in that: The overheat prediction unit obtains transformer overheat pre-judgment data, which is as follows: According to the basic data of the transformer, the temperature and humidity values ​​of the environment where the transformer is located, the standard working temperature and humidity values ​​of the transformer, the load rate of the transformer, and the insulation reference value of the insulation layer of the transformer are obtained; The transformer overheat reference value Gy is calculated by the overheat pre-judgment calculation formula using the temperature value, humidity value, transformer standard operating temperature value, transformer standard operating humidity value, transformer load rate and transformer insulation layer insulation reference value of the transformer environment.

7. The alarm system for transformer winding temperature and core temperature according to claim 5, characterized in that: The overheat prediction unit makes a judgment based on the overheat pre-judgment data, specifically as follows: Obtain the transformer standard load rate, transformer insulation layer insulation standard value, transformer standard operating temperature value and transformer standard operating humidity value; The transformer standard load rate, transformer insulation layer insulation standard value, transformer standard operating temperature value and transformer standard operating humidity value are calculated through the overheating pre-judgment calculation formula to obtain the transformer overheating reference value threshold data Gy1; According to the transformer overheat reference value Gy and the transformer overheat reference value threshold data Gy1, the transformer overheat pre-judgment data is obtained as follows: When Gy≥Gy1, it is judged as a warning transformer; When 0<Gy<Gy1, it is judged as a normal transformer; Overheat pre-judgment data is obtained by judging the transformer overheat reference value.

8. The alarm system for transformer winding temperature and core temperature according to claim 1, characterized in that: The pre-warning module issues a pre-warning and calculates the transformer pre-warning coefficient, as follows; The pre-warning module includes a pre-warning unit and a warning coefficient unit; The pre-alarm unit issues a pre-alarm based on the transformer overheat pre-judgment data, as follows: For the pre-alarm transformer, the first alarm indicator light flashes to issue a pre-alarm; For normal transformers, maintain normal operation of the transformer.

9. The alarm system for transformer winding temperature and core temperature according to claim 1, characterized in that: The alarm issuing module issues a transformer temperature alarm according to the pre-alarm data, as follows: The alarm release module includes an alarm classification unit and an alarm release unit; The alarm classification unit obtains the alarm classification data according to the transformer early warning coefficient, as follows: Obtain the standard operating temperature of the transformer core, obtain the standard operating temperature of the transformer winding, and obtain the transformer overheating reference value threshold data; The transformer core standard operating temperature, transformer winding standard operating temperature and transformer overheat reference value threshold data are calculated by using the alarm coefficient threshold calculation formula to obtain the transformer early warning coefficient threshold data By1; Obtain the transformer warning coefficient By, and classify the transformer warning coefficient By1 according to the transformer warning coefficient threshold data, as follows: When By≥By1, it is determined that the transformer is at the temperature warning level; When By<By1, it is judged that the transformer is at a normal temperature level; The transformer warning coefficient is judged by the transformer warning coefficient threshold data to obtain the alarm classification data.

10. The alarm system for transformer winding temperature and core temperature according to claim 9, characterized in that: The alarm issuing unit issues a transformer temperature alarm, specifically as follows: For transformers at the temperature warning level, the second warning indicator light flashes and the transformer stops working; For a transformer at a normal temperature level, the second alarm indicator light does not flash and the transformer operates normally.

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