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.

Transformer differential protection trip inspection process

Transformer differential protection trip, it should be checked and processed as follows: (1) Check the transformer body without exception, porcelain differential within the scope of protection checks whether flashover, damage, if there is a short circuit 2 lead if the transformer differential protection. no significant fault within the device, you should check whether the secondary circuit protection and fault, if there are two DC circuit ground. 3 or more after inspection  electric meter , should be sent immediately after the removal of a load test, and then try to send the trip may not be sending. 4 If the relay or secondary circuit due to failure or  Electric transformer  caused by moving the DC grounding points, differential protection should be out of operation, the transformer power transmission, and then deal with the secondary circuit and DC ground fault.

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.

Elimination and suppression of ferromagnetic resonance, has taken various measures

In order to eliminate and suppress the ferromagnetic resonance, to take a variety of measures, the selection of the excitation characteristics of a good TV; openings in TV delta winding open end of the installation of a linear damping resistors or bulbs; open delta windings connected in parallel in TV multifunction computer harmonic  mcb circuit breaker  ; the TV  Circuit breaker  to a neutral point of zero sequence TV; side of the TV once in series between the neutral point and ground resonance eliminator. Operating experience shows, TV wiring measures to curb ferromagnetic  electric transformer  a good effect, so it is widely used in domestic power companies. Together with the 10 kV bus through the TV Burning Accident Zero Sequence analysis of the causes of damage explores the TV and from the TV source parameter design proposed ultra-low frequency oscillation suppression over current solutions.

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.

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.

Explosion wave shutter design and structural strength can withstand high intensity explosive shock wave case

Explosion-proof valve is to protect the front wave trenches engineering personnel protective equipment is one of the important survival. It is installed in the tunnel inlet and exhaust system of the head. Usually the shutter is open, trenches normal ventilation; after suffering a nuclear attack, the quick closing valve prevents the shock waves through the mouth of radioactive dust into the tunnel  electric transformer  inside to  Circuit breaker , equipment safety. Explosion wave shutter design and structural strength can withstand high intensity explosive shock wave case, within the fortifications on the tunnel personnel,  air circuit breaker  has played a crucial role. As foreign nuclear power development of weaponry to the United States, Russia, represented by nuclear states, and its missile hit accuracy are improved quickly. Such as: U.S. Minuteman ICBM Ⅲ roadbed, Russia SS.19 roadbed ICBM CEP reach 200m ~ 300m. It is estimated at 50 tons TNT equivalent touchdown burst conditions, positions at 240m radius from the explosion center, and its resistance at 25MPa, the survival probability of 54% (structure and equipment suffered minor damage, the device does not affect use); pair of precision-guided weapons in terms of a higher hit rate.

Multiplier is harmonic backdrop electronic energy meter measurement error resulting main links

Focuses on the electronic energy meter's internal structure and working principle, through the electronic meter error characteristics and frequency characteristics of the theoretical analysis, pointing out that the multiplier is a harmonic backdrop electronic energy meter measurement error resulting main components. Secondly,  electric transformer  wave modulation type time division multiplier (TDM) works to mathematical analysis, the establishment of electronic energy meter measurement error mathematical model. Multisim simulation software to build electronic energy meter  air circuit breaker , and verify that the simulation results of the simulation model was built correctly. Simulation model based on indicators in different circumstances specific harmonic simulation analysis, simulation waveform.

High voltage transformer insulating oil sulfur corrosion, oil furfural determination

To ensure the normal operation of the transformer operation, the power transformer fault diagnosis technology research is necessary. This selection of power transformer insulation fault for the study, from the high-voltage transformer insulating oil sulfur corrosion, oil furfural determination, oil dissolved gas  air circuit breaker  network in fault diagnosis analysis and research in three aspects: Foreign involved with most  Electric transformer  sulfur corrosion related accident, detected in oil dibenzyl disulfide (DBDS) this organic matter. Relevant domestic transformer insulating oil sulfur corrosion failures reported less experimentally simulate the presence of dibenzyl disulfide on oil performance.

The main application direction Electrotechnical

"Electrical Technology" non-electric class professional basic compulsory, which includes two parts: circuit analysis and motor control, and relay contactor control system is an important component of the latter is the main application of electrical  electric transformer . Relay contactor control system by means of electrical control to achieve a certain  Voltage stabilizer , both in respect to the control electrical applications, but also related to how effectively its constitution circuit control requirements. For students, this is a new content, but also the course one of the difficulties in learning, often there are certain difficulties.

Auxiliary converter system isolation contactor failure is more common converter

"Auxiliary converter I" of the two converters to Vll and V 12, "auxiliary inverter 11," the two converters to V21 and V22, a total of four sets of the entire vehicle, respectively, for the respective auxiliary power unit . Set any of them fails,  electric transformer  by isolation, conversion contactor load reallocation, can ensure locomotive maintenance operation. Kind, car segment more than three years in my practice, auxiliary converter system isolation, conversion contactor failure is more common, due to  air circuit breaker handling crew, resulting in more  circuit breakers , therefore, affecting the transportation and production.  failure is more common converteris faulty twisted addictedslave wild side ironing full clarity of J junction compensation in order to better and more S J Lin turned flower locomotive in practical problems.

Switching power supply due to its state at high frequency inverter circuit

Large inductance and high charging rectifiers, bulky, cumbersome. And this power is the energy storage capacitor operating mode "is done and that charge" mode, thyratron and a high  electric meter  storage capacitor a  Electric transformer  the state, seriously affecting the thyratron and storage capacitor life. The switching power supply due to their work at high frequency inverter circuit, the transformer core is very small,  Circuit breaker  the need for large-scale energy storage capacitor coupled inductors and charge, therefore, small size, light weight. Switching power supply for the energy storage capacitor to adopt a "charging is completed, the release" mode, thyristors and capacitors to withstand high pressure of the time far below the resonant charging mode.

Ranging data is low, affecting the data to improve the accuracy

Current international satellite laser ranging stations ranging widely used frequency below 10Hz, using pulsed xenon lamp-pumped laser devices, although this ranging technology is quite mature, but the disadvantage is obvious: repetition frequency is low,  mcb circuit breaker  capture the satellite, LEO satellites for some or even undetectable data; ranging data is low, affecting the data to improve the accuracy;  electric transformer  of the laser output beam and pulse wave instability brings the system unstable and affect  electric meter  accuracy. These are restricting the Satellite Laser Ranging further scientific applications. Especially in recent years, there have been some mm-level precision scientific applications, this laser ranging system accuracy and the number of observations have raised further requirements.

Low power high harmonic pollution is rising

Electrical construction electrical design basis is the most important documents, the main factors affecting the quality of the project are: the design file is executed in strict accordance with state regulations, the depth of the design and construction documents relevant professional close coordination between the degree. Therefore, the electrical design of the whole project a top priority. Decline in quality design is particularly serious in recent years. There may be multiple reasons, such as the design of the vicious competition, lower prices between companies,  Electric transformer units to reduce inputs in order to reduce costs and so on. However, these symptoms are not chronic, as long as the design unit attached importance recurrent organizational design personnel to learn the relevant design standards and  electric meter  the design process of supervision,  mcb circuit breaker  review, you can basically solve such problems, but such small changes it can make project supervision and construction will benefit. Affect the quality of several electrical engineering design problems violate or deviate from the design Electrical design specification With the popularity of various household appliances, low-voltage power high harmonic pollution is increasing, times and odd harmonic multiples constitute neutral current, neutral overcurrent and thus lead to the phenomenon of electrical fires is also increasing.

Mine explosion-proof electrical products in the technical development work

Mine production environment is very harsh, gas and coal dust explosions have occurred, therefore explosion-proof electrical switch design and manufacturing is very important. Author many years engaged in mining explosion-proof electrical products,  Electric transformer  development work on how to improve product safety, avoid safety hazards, and accumulated some experience. The main points discussed below are optional.  electri cenergy meter  groove on the rod-proof products, many manufacturers now shell and front cover has a variety of button, the button bar is often used form of ring, ring effect is that once the explosion occurred inside the enclosure, the pressure acting on the F button end of the rod when the rod ring prevents the button is pushed outside shell, thus avoiding the formation of the button bar missing booster channels.

Transformers can be put into operation guide reliable, safe and economic operation

Combined with the power system status and development needs, according to the transformer and more high performance requirements of the transformer and the actual current detection means perfect, with computer control technology, studied theoretically  electric transformer testing and fault diagnosis of technical methods to guide transformers put into operation a reliable, safe and economical operation. By analyzing the transformer  circuit breakers , sorting out the work to meet the power  Voltage stabilizer  testing standards, testing requirements and procedures; accordance with the "functional integration, structured microcomputer, monitor screens, management intelligent" requirements, design performance parameters of power transformers Integrated Detection System ;

Undervoltage release device which is attached a

With the mini circuit (hereinafter referred to as MCB) in the terminal building electrical distribution equipment widely used. Now with some of the electrical auxiliary devices and protection accessories (also known as attachment) with MCB body assembled together in  air circuit breaker  to increase the MCB, expanded scope of use. Undervoltage release is attached devices one of them. In this paper, suitable for use with MCB assembled  Electric transformer  release applications and design issues elaborated, introduces a voltage auxiliary circuit. An undervoltage release features undervoltage release is a protective accessory; at its terminal voltage drops below a specified range.

Improve on-time delivery rate and improving design accuracy once

While many companies in the design and low voltage electrical switches Guiji have been using a variety of CAD systems, to a certain extent, simplifies the design work, but just stay in the lower level of basic two-dimensional computer-aided design stage, when faced with changing user works contracts, it is difficult to achieve agile and  air circuit breaker . Thus, poor product design means designing and manufacturing enterprises often become the bottleneck link. In order to further reduce design time and improve on-time delivery rate, and improve design accuracy once,  Electric transformer  parts library design ideas, develop a set of high and low voltage electrical switchgear 3D standard parts library and switchgear virtual assembly system to solve the traditional enterprise  mcb circuit breaker  switch design displeasure, inconvenience, and allowed other problems. Computer-aided design software, the main function is to operate to achieve the user through an interactive design intent, but the user can not complete the special or specific requirements.

Mechanical shock shocks on the ship when the main features

Mechanical impact on the ship on the ship when under attack ship structure is characterized by a sudden movement gained. The nature of this movement is very complex. The equipment on the ship (including circuit breakers) required to withstand sudden movement and not suffer. Ship structure produce sudden movement may be due to: ① non-contact  Voltage stabilizer ; ② contact explosion; ③ by a bomb exploded in the air or ship their weapons transmit the generated air waves. 1.2 Impact on the adverse effects of the circuit breaker breaker movement of the ship above the impact of the response will cause one or more adverse effects. These negative effects can be  electric transformer  follows: (1) mechanical damage usually takes the form of mechanical damage breaker member breakage or permanent deformation. If the damage is very serious that the circuit breaker can no longer perform its  circuit breakers , because of the impact that the failure of the circuit breaker. The word must be noted that failure nature of the damage, the mounting device may cause severe deformation of the circuit breaker is able to continue normal operation state, and the shaft or rod linkage may make slight permanent deflection not work. If the circuit breaker is not materially affected the availability, it can happen that there is no damage.

Intelligent release is the core of intelligent low-voltage circuit breakers

Intelligent release is the core of intelligent low-voltage circuit breakers, not only has the general release of the various protection functions, but also has real-time parameter display, fault memory and queries, self-diagnostics, networking, communications and many other features. In the reviewed and summed up the development  air circuit breaker  release after  power transformers  the current smart appliances, especially the development trend of intelligent release is proposed based on DSP and CAN fieldbus intelligent release research direction. Paper discusses in detail the design  Electric transformer  of intelligent release from the electrical parameters of the sensor to the electrical parameters of the sampling method of calculating with intelligent release from a variety of protection features to achieve these protective properties of the mathematical model.