1. Cooling layer:
The cooling layer is located on the surface of the coal pile, about 0.5 to 1.5 meters thick. The layer is in full contact with the air. Although the oxidation reaction occurs, the heat dissipation condition is good and the heat is difficult to accumulate, so the incidence of spontaneous combustion is low.
2. Oxide layer:
The oxide layer is below the cooling layer, about 1 to 4 meters thick, and has a certain oxygen supply. The heat emitted by the oxidation reaction is difficult to dissipate heat, and keeps accumulating and heating up, which in turn promotes the oxidation reaction and is prone to spontaneous combustion.
3, choking layer:
The asphyxiation layer is located below the oxide layer, so the oxygen supply is insufficient and spontaneous combustion cannot occur.
Power plants tend to store coal piles after compaction, resulting in a decrease in porosity and a corresponding decrease in the depth of the oxide layer of coal piles. According to field experience, the oxide layer is usually located in the depth range of 1 to 4 meters below the surface. From the actual situation of the coal yard, the spontaneous combustion of the coal pile also shows a very obvious local regional sudden characteristics, there are many reasons, for example, there are some coal blocks in a certain location, resulting in good oxygen supply conditions of the location; Or a location of the coal in the process of stacking damp, moisture more visible coal pile temperature importance.
Oil pressure strength tester is an instrument for measuring the dielectric strength of insulating oil. Dielectric strength test of insulating oil is a routine test in the high voltage electrical industry. Usually, the performance analysis of transformer and capacitor oil is carried out regularly. Through the dielectric strength test of oil, the insulation performance and dielectric strength of oil can be effectively detected to ensure that the quality of oil is normal, so as to avoid the occurrence of breakdown.
Oil pressure strength tester is suitable for testing the dielectric strength of various insulating oils in the electrical industry. When there was no such instrument before, testing the performance of oil is very troublesome, and to test the dielectric strength, and to test the dielectric loss, are tested by the old way, wasting human and material resources and financial resources, Through the oil pressure strength tester can effectively one-time test the performance of insulating oil, save time and effort.
Baoding Excellence Electric Co., Ltd. always adheres to the business philosophy of "science and technology as the first, honesty as the foundation", takes the market as the guide, takes the customer demand as the center, takes the quality as the theme, takes the technology innovation as the power, strives for survival by the quality, develops enterprising, updates the perfect testing equipment, improves the quality assurance system. Let customer satisfaction is the purpose of the company, to provide customers with reliable products and thoughtful service is the company's staff will always strive for the goal.
The company will continue to carry forward the spirit of hard work, to produce excellent products as its own responsibility, and constantly improve product quality and service level, as always forge ahead!
Precautions for the use of oil pressure tester: do some matters needing attention when testing the dielectric strength of insulating oil. To ensure the accuracy of the test, the oil cup used for the test must be carefully scrubbed clean, without stains and kept dry. However, the oil cup must not be dried at will, and the surface of the electrode must be clean and smooth. Because there are high-precision parts in the instrument, the performance of the parts will decline in a humid environment. After the test, the instrument should be stored in a dry and ventilated place. In the process of testing the boost, do not touch the metal part of the instrument, which is very dangerous to avoid accidents, to do a good job of grounding measures, strictly in accordance with the test steps to operate.
Baoding excellence electric co., LTD. Is engaged in the wireless temperature measurement, the coal temperature, the transformer on-line monitoring, grounding transformer core, transformer capacity tester, dc resistance tester, oil pressure tester, oleic acid value tester, empty load tester, and other products of research and development, production, sales, service as one of the high-tech enterprises.
Spontaneous combustion of coal pile often needs to have three main conditions: one is the tendency of spontaneous combustion of coal quality, two is good oxygen supply conditions, three is poor heat dissipation conditions. The spontaneous combustion capacity of various coals is different, and some are easy to spontaneous combustion, such as lignite, long flame coal, etc. Some are not easy to spontaneous combustion, such as lean coal, anthracite, etc., in addition, the higher the sulfur content and moisture content of coal, the faster the oxidation reaction rate, the more heat release, the more easily spontaneous combustion of coal. Coal pile heating is oxidation reaction, so the coal pile spontaneous combustion requires a certain porosity, good ventilation conditions. The oxidation reaction of the coal pile emits heat. If the heat dissipation condition is poor, the heat accumulation will improve the temperature of the coal pile. The higher the temperature of the coal, the more intense the oxidation reaction is. Therefore, the coal pile temperature measurement of different types of coal pile oxidation layer can be set up a reasonable anti-spontaneous combustion monitoring temperature, through the coal pile oxidation layer temperature measurement to predict whether spontaneous combustion will occur in the coal pile.
Baoding excellence electric co., LTD. Is engaged in the wireless temperature measurement, the coal temperature, the transformer on-line monitoring, grounding transformer core, transformer capacity tester, dc resistance tester, oil pressure tester, oleic acid value tester, empty load tester, and other products of research and development, production, sales, service as one of the high-tech enterprises.
The company is guided by science and technology, relying on hebei University, North China Electric Power University and other institutions of higher scientific research, power system professionals and our company's professional R & D personnel, and has been committed to developing the power system automation this high-tech field. The company has perfect production, test equipment, strictly in accordance with the national standards and industry standards for production, and constantly improve, update, and strive to make the products meet or better than the national standards and industry standards; Strictly control each link in the production process, to ensure the stability and reliability of product quality, to better meet customer needs and faster development laid a solid foundation. Products have been widely used in electric power, water conservancy, petroleum, railway, mining, chemical, machinery, metallurgy, electronics and many other fields. Sales and service network covering nearly 30 provinces, autonomous regions, municipalities directly under the central Government, reliable technical performance and product quality has won the praise of users.
The company will continue to carry forward the spirit of hard work, to produce excellent products as its own responsibility, and constantly improve product quality and service level, as always forge ahead!
Baoding Excellence Electric Co., Ltd. takes science and technology as the guide, relies on hebei University, North China Electric Power University and other institutions of higher scientific research, power system personnel and our r & D personnel, and has been committed to developing the high-tech field of power system automation. The company has perfect production, test equipment, strictly in accordance with the national standards and industry standards for production, and constantly improve, update, and strive to make the products meet or better than the national standards and industry standards; Strictly control each link in the production process, to ensure the stability and reliability of product quality, to better meet customer needs and faster development laid a solid foundation. Products have been widely used in electric power, water conservancy, petroleum, railway, mining, chemical, machinery, metallurgy, electronics and many other fields. Sales and service network covering nearly 30 provinces, autonomous regions, municipalities directly under the central Government, reliable technical performance and product quality has won the praise of users.
Oil pressure strength tester method of use
1. Adjust and place the electrode of the oil cup, put the oil into the instrument and cover it with a glass cover.
2. Plug in the power cord and turn on the power switch. At this time, the power indicator is on and the instrument has started to work.
3. When the zero indicator light is on, press the start button, and the high pressure indicator light is on. At the same time, the instrument will automatically boost the voltage according to 2KV/S speed, and observe the indicator status of the instrument.
4. After the oil breakdown, the relay operates and the high voltage is disconnected. The voltage displayed by the instrument is the oil breakdown voltage.
5. Press the "stop and reset" button, the voltage displayed on the instrument disappears, and the motor reverses back to the "zero" position. When it reaches the zero position, the zero indicator light stops automatically at the same time.
6. After 5-10 minutes of oil static, repeat the above work for 3-6 times to synthesize the average value. At this time, the converted data is the electrical strength value of insulating oil.
Baoding excellence electric co.,LTD.Is engaged in the wireless temperature measurement,the coal temperature,the transformer on-line monitoring,grounding transformer core,transformer capacity tester,dc resistance tester,oil pressure tester,oleic acid value tester,empty load tester,and other products of research and development,production,sales,service as one of the high-tech enterprises.Today and everyone together about the empty load tester in the use of what matters needing attention.
1.Do not touch the metal part of the test line during the measurement to avoid being injured by electricity.
2.Measuring wiring must be operated strictly according to the instructions,otherwise the consequences shall be borne by you.
3.Before testing,make sure that the parameters set are correct.
4.It is best to use the power socket with ground wire.
5.Cannot operate under voltage and current overlimits.
6.During the short circuit test,the short connection of the non-pressurized side must be good,otherwise it will affect the test result.
7.During the short circuit test,if the high voltage or medium voltage side outlet bushing is equipped with annular current transformer,the secondary current transformer must be short-circuited before the test.
8.The test wiring shall be carried out under the condition of grounding of the tested line to prevent electric shock by induced voltage.All short circuits,grounding and leads shall have sufficient cross sections and shall be securely connected.The test organization should be strict and the communication should be smooth to ensure the smooth progress of the test work.
9.If the instrument is not used for a long time(more than three months),the battery will be exhausted and damaged,so the instrument should be charged once every three months(about 90%of the power will be displayed after it is turned on)to ensure the normal use of the instrument.Charging steps:plug in 220V power supply,turn on the power switch,charging indicator light(this charging mode for fast charging,charging about two hours after the power display 90%can be)
10.Time adjustment:After starting up and entering the main menu,press cancel for five consecutive times,and then press OK to enter the date and time adjustment interface.Press left and right keys to select and up and down keys to adjust.
Transformer is an important and expensive key equipment in the power system, it bears the responsibility of voltage transformation, electric energy distribution and transfer, the normal operation of the transformer is an important guarantee of reliable economic operation and power supply of the power system, therefore, it is necessary to minimize the occurrence of transformer failures or accidents. But because the transformer runs for a long time, it is impossible to avoid faults and accidents completely. So in the implementation process of the important online monitoring of the transformer, so the main measurement of what data, today Baoding Excellence Electric Co., Ltd. will give you say.
1. General detection of oil change: oil temperature, oil level, gas (switching volume: light gas alarm, heavy gas trip), etc.
2. Dry change general monitoring: temperature (temperature simulation quantity, switching quantity: high temperature alarm, overtemperature trip), etc.
Transformer a static electrical device used to transform ac voltage and current and transmit ac electrical energy. It is based on the principle of electromagnetic induction to achieve electric energy transfer. Transformer on its use can be divided into power transformer, test transformer, instrument transformer and special purpose transformer: power transformer is the power transmission and distribution, power user distribution of the necessary equipment.
In the management of coal yard, the phenomenon of self-heating and spontaneous combustion is widespread. The self-heating and spontaneous combustion of coal pile not only waste energy and increase the cost of power generation, but also cause serious pollution to the environment by carbon monoxide, sulfur dioxide and other harmful gases produced by spontaneous combustion. With the further promotion of power plant of blending system and the popularization, the power plant used by more and more coal, producing area and source, fuel management work more and more complex, faces many challenges, including of heating combustion phenomenon more and more serious, the traditional artificial coal temperature and burn the old "new" system is more and more not adapt to the current status of coal yard, unable to curb of heating combustion phenomenon.
At present, the traditional of coal temperature measuring device is to open a at both ends of the tube inserted into the depths of one, and then put a rope connected thermometer in the pipe, temperature measurement, so the temperature measurement on the downside, the tube is inserted into the process of oxidation layer, due to the tube inserted into the pile end is open, the coal surface of coal is not because tube insertion were pushed out, However, it remains in the inside of the tube. Although the coal on the surface of the coal pile will sink to a certain extent with the tube in the process of inserting the tube into the coal pile, it is still the surface coal, that is, the traditional measurement method measures the temperature of the coal on the surface of the coal pile, so that the temperature measuring component can not accurately measure the actual temperature of the oxide layer. In addition, as there is no mark indicating the height of the pipe, how deep the temperature measuring pipe needs to be inserted depends on the operator's experience, which also leads to the inability to accurately measure the actual temperature of the oxide layer. It can be seen that the traditional coal pile temperature measuring device can not accurately measure the actual temperature of oxide layer because of its structural defects, so that it can not play a role in monitoring the coal pile, and even bring serious consequences.
As we know, transformer in operation, shell, iron core and other components must be grounded, this is the use of the principle of protective grounding, when the transformer fault shell is charged, the current into the earth. But why is the core only slightly grounded?
Why the transformer core must be grounded
Transformer in operation or test, iron core and parts and other metal parts are in a strong electric field, due to electrostatic induction in the iron core or other metal structure to produce suspension potential, resulting in discharge to the ground and damage parts, this is not allowed, in addition to screw, iron core and all metal components must be reliably grounded.
Two. Why is the iron core only allowed a little grounding
If there are two points or more than two points of grounding, a closed loop is formed between the ground point. When the transformer runs, the main magnetic flux through the closed loop will generate circulation, which will cause local overheating of the iron core, burning parts and insulation, causing accidents, so only one point of grounding is allowed.
How to operate transformer core grounding?
1. The core is connected with the core clip (only one place) through the grounding piece (usually copper).
2. The clip is connected with the oil tank.
3. There is a grounding bolt in the lower tank. The user only needs to connect the grounding wire with the grounding bolt on the transformer tank reliably.
Transformer capacity tester is a high precision testing instrument developed for the current market situation. It has its own rechargeable battery, without external power can be charged a continuous measurement of 100 times. At the same time, the internal digital synthesis of three-phase standard sine wave signal, low distortion, high stability, effectively ensure the accuracy of the project test data under non-rated conditions; Through the power amplifier output three high-power test power supply, can automatically adjust the output voltage and current, can adapt to different capacity transformer test, wide application range. In the measurement of transformer capacity and transformer short circuit loss does not need external three-phase test power supply and voltage regulator, current booster and other auxiliary equipment, simplified wiring, greatly improve the work efficiency; The accuracy of capacity test results is 100%.
Transformer capacity tester features:
1, can measure the capacity of various distribution transformers, passive measurement, convenient and accurate.
2, internal power supply, automatic generation of three-phase high-power test power supply.
3, can measure various types of transformer no-load current, no-load loss, short circuit voltage, short circuit loss.
4, can be automatically waveform distortion correction, temperature correction, voltage correction (non-rated voltage no-load test), current correction (non-rated current condition short circuit test), transformer capacity tester operator only according to the transformer type input calibration index instrument can automatically calculate the results after correction, It is very suitable for units without short circuit test conditions of slightly larger capacity transformers.
5, voltage loop width limit: the maximum voltage can be measured to 750V, without switching gears can ensure the accuracy. No damage to the instrument itself due to the wrong selection of voltage range.
6, the remaining battery percentage indicator function, is not a simple power loss alarm.
6, large screen, high brightness LCD display, full Chinese menu and operation prompts to achieve friendly man-machine dialogue, touch the key to make the operation more convenient, wide temperature LCD with brightness adjustment, can adapt to the winter and summer seasons.
7, the user can test the data at any time through the micro printer will print out the results.
8, with test results storage function, transformer capacity tester can store 200 groups of capacity test data.
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