When charging the transformer should put all protection, and to ensure there is sufficient sensitivity

When charging the transformer should put all protection , and to ensure there is sufficient sensitivity , taking into account the impact of inrush current protection system . To ensure the stability of the system , if necessary, reduce the charge should be preceded by the relevant line of active power. Large current grounding system before charging or transformer outage must be neutral grounding blade closed. After charging , check the supply voltage, so that each side of the voltage transformer does not exceed 5% of the corresponding tap voltage . When the transformer into operation , should be less affected side of the inrush current power transmission . Generally start charging power supply side , after closing the load side switch. When a power outage , you should pull the load side of the switch, pull the power supply side of the switch. If 220kV transformers high and low pressure  mcb circuit breaker , when power by charging high side and low pressure side of the tie should be on the low side splitting power outage . When the ring transformer operating system , you should select the correct charging terminal to reduce the voltage difference tied at . When the transformer parallel operation , shall comply with the conditions of parallel operation . Transformers stop, when an impact  power transformers  as when the power would run the system transformer neutral grounding , protection must be adjusted according to the requirements of operating procedures in the adjustment process, should be fit after pulling principles. For stop after power operation in hot standby transformer neutral point grounding blade should close the state.

Transformer protection misoperation pressure release case studies

Main transformer pressure relief protection, as important non- power transformer protection , depending on the fuel tank body release valve micro switch to achieve. That is when the oil inside the device accidents , oil tank is vaporized , producing large amounts of gas , so that a sharp increase in pressure inside the tank . When the tank pressure  power transformers opening pressure rises to its micro switch quickly closed, while the rapid release valve opens within 2ms, so the tank pressure rapidly decreases, while its micro switch quickly closed, turned tripping circuit , broken open each side of the transformer circuit breaker .  electric transformer  the deformation of the transformer tank , or even burst. However, the actual operation, the transformer pressure relief protection malfunction accidents often occur. Shandong SISHUI ​​power company belongs 110kV substation Kim Chong , occurred because of the pressure relief protection transformer malfunction , each side of the transformer circuit breaker tripped , causing power loss of pressure in the station accident . Kim Chong 110kV substation is an important hub for the western grid substation Surabaya . Powered by 110kV and 110kV lines Jinzhuang song Si line, the bridge connection , a single mother of segmented , double main transformer mutual standby operation.

Troubleshooting substation with transformer

Found the following cases, the emergency disconnect each side of the transformer power supply: Internal strongly inhomogeneous noise and the sound of the spark discharge; conservator or spill-proof tube; casing burst, flashover discharge exaggerating; Oil and gas meter relay do not see the oil level; under normal load conditions, the temperature swells,  electri cenergy meter  the allowable value; If the standby power switch automatically when the power loss in the transformer, check switch is good;  power transformers  the high voltage side of the transformer isolation switch, it is checked if the switch into standby transformer should be good to keep the power supply. If the high voltage transformer fuse breaking work should be put into standby transformer, then opened the work on both sides of the transformer isolation switch, check its associated equipment to determine the cause of the accident.

Traditional contactor product-oriented design methods, using trial and error methods

Traditional contactor product-oriented design methods, using trial and error, long development and production cycles, low efficiency, high cost; and product performance and other aspects of electrical life is often difficult to achieve the desired targets. The merits of the dynamic characteristics affecting the performance of high-power DC contactor and electrical life is good or bad, is an important factor in the mechanical  electric meter . Therefore, the use of virtual prototyping technology to the dynamic characteristics of high-power DC contactor for analysis and optimization has important theoretical and practical significance. In this paper, a series of high-power dual-winding DC contactor for the study, based on virtual  power transformers  technology combined with the structural characteristics of the type of contactor, analyze its static mechanical properties of the reaction force, the establishment of an equivalent circuit model double  air circuit breaker , the development of direct contacts analysis of dynamic characteristics of virtual prototyping system, and thus on the dynamic characteristics of contacts to optimize the design in order to improve its reliability and electrical life. In this paper, multi-software co-simulation method to establish the dynamic characteristics of high-power DC contactor analysis model.

When existing traditional DC contactors work, pull the breaking process should arcing

Existing traditional DC contactors work, pull the breaking process should produce an arc , and the contactor coil has to rely on the pull to keep energized contactor closed state , there is a coil power consumption, power run when noise, there is a strong arc shortcomings off when the main contact circuit , so not only caused a lot of energy waste , pollution of the surrounding environment, but also greatly reduces the electrical contactor life . This article is based on the original DC contactor on its  power transformers  and no arc transformation , which developed a non- permanent magnet DC arc contactor. It uses NdFeB rare earth permanent magnet  mcb circuit breaker  and high- power electronic devices , such as the combination of acting on the contactor electromagnetic system . The use of magnetic flux generated by the permanent magnet to pull the state to maintain the coil is energized only when breaking moment , the rest of the time there is no  Circuit breaker  the coil from the fundamental solution to the problem of power consumption . Through the use of special measures to release a good solution to power and voltage protection issues such as permanent magnetic contactor , contactor so it has a strong magnetic pull , permanent magnet to keep saving , noise-free function. Meanwhile , in the original contactor in parallel across a triac , contacts and thyristor action sequence by using a special control unit has the strength of electrical isolation of control .

Due to constantly switch loading and unloading, excitation contactor frequent contacts with electrically controlled pull and release

Problems in the line locomotive traction process, regularly running load and unload meet changing requirements in order to achieve a constant speed running resistance. Due to  mcb circuit breaker  switch loading and unloading, excitation contactor frequent contacts with electrically controlled pull and release, excitation contactor off by the strong current  power transformers  moments often burning the main contacts. At the same time due to electrical control contacts open distance and overtravel can not achieve the same, 6 Taipower can not meet the synchronization control contactor closing and opening, individual electric contacts early release caused by the burning of contacts, it is necessary to take effective measures to prevent it.

Braking resistors are made locomotive excitation regulator control

Wheel on the train through the kinetic energy into electrical energy consumed in the braking resistor, then the form of heat escaping into the atmosphere. In this process, generated by the traction motor shaft counter moment acting on the motorcycle wheel braking force generated on. The braking effect is called resistance braking.  electric transformer  diesel locomotives, most equipped with resistor braking devices. All Dongfeng diesel locomotive braking resistor circuit conditions substantially the same as the braking resistor are made locomotive excitation regulator (or resistor braking control cabinet) control, when the resistor  power transformers , the excitation regulator (or resistance brake control cabinet) according to the engine speed signal and provides the braking current and the magnetizing current  Voltage stabilizer  and actual braking current and excitation current is compared with a reference value by calculation, outputs a signal to control the chopper excitation current excitation system, the braking current and excitation current limit within a predetermined range.

Specifically for switchgear temperature measuring instrument, little, live temperature monitoring, there are two main methods

Specifically for switchgear temperature measuring instrument, little, live temperature monitoring methods are mainly two: First, the measured surface coated with a temperature-dependent color light-emitting materials, by observing the color changes to roughly determine the temperature range, this method is low accuracy, poor reliability, quantitative measurement can not be performed; another method is  electric meter  an infrared  power transformers , infrared temperature measurement accuracy and reliability of the test by atmospheric background, the distance factor, the object emissivity the operating wavelength, regional and instantaneous FOV and other factors, it is very difficult to do accurately measure; and because this  Voltage stabilizer  equipment and there are no obstructions between the measured point can be accurately measured, so that the high pressure switch cabinets and other specific occasions too convenient. Therefore, the author developed a contactless temperature sensor line monitoring system, since the monitoring device at a high potential, surveyors can not close, so the temperature sensor system using front-end power.

E-glass fiber and its products have a range of excellent performance because

The transformer is an important power industry for substation equipment, ensure that the transformer operation safety and reliability, not only for the promotion of economic development and social progress of great significance, but also to ensure that people's lives and property also has a very important significance. E-glass fiber and its products because with a series of excellent performance, especially good  power transformers , high heat resistance, has been in power electrical industry has been widely used. In recent years, due to the power transformer and technological progress and product upgrading, glass fiber and its products in the manufacture of dry-type transformers, has become an indispensable important material.  air circuit breaker  of the development since the Faraday discovered electromagnetic induction has been more than a century ago is the earliest of the transformer dry-type transformers. Because of this transformer can not be bigger, high voltage can not do technically was extremely restricted. The emergence of  electric transformer technology development made an indelible achievements. Currently, the transformer industry mainly to produce mainly oil-filled transformers, which accounts for about 60% of total capacity to 70%. In the use of oil-filled transformers have some fatal disadvantages, limiting its wide application.

Online adaptive protection can automatically identify and diagnose the fault type

Change caused by the regulator tap the TA secondary current mismatch, seriously affecting the accuracy and reliability of the differential protection. Online adaptive protection can automatically identify and diagnose the fault type and automatically  mcb circuit breaker  and characteristics of protective action. As adaptive protection hardware foundation, the rapid development of computer systems makes adaptation more extensive  power transformers  prospect theory. In-depth understanding of transformer differential protection based on an adaptive principle and criteria currently used inrush current is proposed by combining the new voltage switching principle and the second harmonic restraint combination of complex criteria.

Do not use iron tools percussion drums, especially installed over empty bucket of gasoline is more dangerous

Around the barrels of gasoline or diesel, especially for warehouse storage of barrels of oil to be ventilated to ensure timely  mcb circuit breaker of fuel vapor. In the depot or reservoir area over the ban erection wires. Do not use iron tools percussion drums,  Voltage stabilizer  installed over empty bucket of gasoline is more dangerous. Because the barrel of the combustible gas tap out a case of Mars, it will explode and burn rapidly.  power transformers  collision between drums, do not wear shoes with nails to work in the depot in order to avoid touching the iron sparks cause fire. Stained with oil cloth, cotton yarn and gloves and other items, do not pile up in the depot in order to avoid temperature rise caused by spontaneous combustion.

Low-cost explosion of new materials is undoubtedly a piece of meaningful work

Explosion-proof sheet metal fabrication difficult, requires high precision manufacturing nip machinery and material attached to ensure no oxidation, organizational  electri cenergy meter  uniform heat treatment apparatus and other processing equipment, making the cost of greatly improved, a proof sheet metal processing costs to attributable costs more than 90 bowel. Therefore, seeking reliable, low cost explosion-proof sheet material is  power transformers  a new meaningful work. Voltage stabilizer  artificial graphite is an excellent corrosion resistance, and ease of processing of brittle materials. Used to manufacture explosion-proof film, when it burst, it is possible to achieve similar shear rupture disk bursting form, to get the maximum through the area.

When the material is corrosive or crystallization, may cause corrosion or wear of the valve seat

Pressure vessels and equipment commonly used security device has safety valve, explosion-proof tablets.  electri cenergy meter  proved that the reliability of the safety valve and the nature of the material being processed has a direct relationship between the corrosion resistance when the material or crystallization, may cause corrosion or wear of the valve seat, resulting in seal failure; when the material is  power transformers  the reaction. large amount of gas when the pressure within the vessels or equipment will rise sharply, requires a large passage area, this time, the use of explosion-proof film is more appropriate. Ex-piece safety device of simple  air circuit breaker , reliable work, by capacity, is used widely. At present, the domestic metal rupture disc has more in-depth research, has made great progress.

A sudden increase in pressure automatically when the pressure relief safety devices rupture

Explosion-proof film, also known as proof membrane, blasting plate, since rupture disk. A sudden increase in pressure automatically when the rupture pressure relief safety device. Installed in the presence of flammable gases, vapors or dust and other  mcb circuit breaker  pressure vessel or piping, equipment or pipeline materials when suddenly boost or exceed the design pressure transient response can be  power transformers  blasting pressure relief. Which is characterized by multi-release materials,  Voltage stabilizer , simple structure, the device can withstand rupture test conditions. For high viscosity and corrosive materials equipment systems and easy to crystallize or polymeric materials can clog valves and does not allow any fluid leakage occasions.

Thereby reducing the explosive ammonium nitrate fertilizer; adding a small amount of proof agent

Ammonium nitrate crystals after being hit, the friction between the crystals and ammonium nitrate containing tiny bubbles  Circuit breaker produces a hot, fast diffusion and the formation explosion. For these two main reasons, the major modification methods are: by doing fertilizer, ammonium nitrate reduction in the content of  air circuit breaker , thereby reducing the explosive ammonium nitrate fertilizers; adding a small amount of proof agent, inhibiting its explosive, so that both high retention of  power transformers  fertilizer, but also reduce the explosive. The experiment by adding a small amount of thermal decomposition of ammonium nitrate explosion and inhibits the generation of hot spots, to ammonium nitrate explosive control. According to several experiments to determine the three-proof formulations were tested for various sensitivities.

Phytic acid is usually in the form of calcium and magnesium salts in plants

Characteristics and uses of phytic acid chemical name is inositol hexaphosphate, also known as phytic  electric transformer  esters. Is light yellow or brown syrupy liquid, soluble in water, 95% ethanol and acetone, insoluble in benzene, ether, hexane and chloroform, the proportion of 1.58. Easy to decompose when heated. Phytic acid is lectri cenergy meter  form of calcium and  power transformers  salts in plants, rice bran, sesame, wheat, soybean, peanut, corn and other grains and oilseeds seed coat, embryo, etc. content of more, usually 0.5% to 6% . Phytic acid has 12 dissociated acidic hydrogen ions and six phosphate groups, it has a unique chemical properties and physiological function.

Brush sparking or electrical contacts can always sparks ignite explosive gases, explosion test

Depots , mines and other places where flammable gases used in motors, electrical motors were tested must pass after a reasonable gap and then into the tank . Use explosion-proof .  Air circuit breaker  of flammable gases , such as fuel gas tank , exhaust pipe guide when inflated to protect the tank on top of a breakthrough kraft paper, etc. near the outside , the use of electrical appliances must also use explosion-proof . Because the motor unit plus Tiegai be ensured by mechanical means . Brush sparking or electrical contacts can always sparks ignite explosive gases, explosion test : as long as the gas concentration reaches a certain value can cause an  air circuit breaker . This problem is inside the motor and tank test spark plug with a high voltage generator connected ( ie, the old machine new machine design and modification can not be ignored . Automotive ignition coil ) , there are two  power transformers  . Explosion-proof electrical design structure, material selection should meet explosion-proof electric motor connected to the subjects within the spark plug power supply, the motor combustible gas blasting machine technical requirements. New trial and for each product line-item fried routine tests are required . At this point the gas tank can not explode. Identification method is to tank Bu side. Breakthrough kraft not explode . If you were blasted , indicating the subjects can not be flameproof motors .

Ex-wave plate for hanging protective properties of the shutter is more mature

Civil air defense projects ventilation equipment types used internally complex, the production process is relatively backward means of detection, product quality can not effectively ensure ventilation. In order to regulate the ventilation ventilation protective equipment performance testing, protective equipment to improve product quality, it is necessary to develop a standard set of test bench. Currently, hanging plate proof protective  power transformers  of wave shutter has been more mature, and the ventilation valve on the hanging board performance study was relatively small. In this paper, the shutter mechanism and close the ventilation air flow  air circuit breaker , hanging plate ventilation valve test bench is designed to provide a theoretical basis. Hanging plate valve closed model mainly by the base plate,  mcb circuit breaker , hinged seat and limit housing component. Close valve when hanging panels, new air vents through the hanging plate inside and out diffusion chamber. If the wind gradually increased from 0 to slow the increases to a certain extent from the rear overhang board is placed phenomenon, this time from the air flow is called swing wind; when ventilation rate continues to increase to a certain extent, then hanging plate closes and the the air flow is called close air volume. Put the wind from the air flow volume and turn off the ventilation valves belong performance.

Industry Association club and Nanyang Explosion-proof motors Electric Institute jointly

With the deepening of reform and opening up, all walks of life has changed dramatically, with the rapid economic and technological progress and industrial development on the product performance, quality, a new and higher requirements. China Electrical  air circuit breaker  Association,  power transformers  electrical motor branch of Nanyang Institute teamed up with the explosion-proof motor industry and users  mcb circuit breaker  research, on the basis of proof on the motor according to the current standards, as well as a comparison with the motor, integrated in the explosion safety and quality, energy conservation, environmental indicators and other aspects of the production process problems and security risks, as soon as the products included in the proposed national phase-out product catalogs, stop the production and sale of referrals, the motor security flaws, the motor will be replaced motor is based on GB3836-83 "electrical equipment for explosive atmospheres" "General requirements" and part 2 "flameproof electrical equipment" design, manufacture.

Operator to enter the storage room and the plenum chamber shall not carry matches

If mixed with hydrogen in the air volume to the total volume of 4% to 74.2%, once the event sparks can cause a fire or explosion.  Air circuit breaker  to the hazardous properties of hydrogen, we have in the transport, storage and use of hydrogen process must pay attention to fire and explosion. 2 safety procedures ① operator must undergo a  mcb circuit breaker  and have higher job card issued by the department to mount guard, the operator strictly follow the rules and safety operation points executed. ②  power transformers  the storage room and the plenum chamber shall not carry matches, lighters and other fire, not easy to produce static wear chemical fiber clothing, shoes and shoes with nails to turn off the phone.