Explosion-proof motors are generally used in explosive environments

Explosion-proof motor is mainly used in coal, oil and gas, petrochemical and chemical industries. In addition, textile, metallurgy, city gas, transportation, grain and oil processing, paper making, medicine and other departments have also been widely used. With the development of production, there is a risk of explosion is also increasing, so how to choose a suitable explosion-proof motor it? We introduce the following aspects. Explosion-proof Motor and General Motors difference:  Electric energy meter  motors generally used in explosive situations; explosion-proof electrical junction box sealing better than ordinary motor; explosion-proof motor protection class minimum as I, but also some rather ordinary motor, it  electric meter  containing flammable, explosive, corrosive gases and relatively clean place, and used to drive a variety of machinery and equipment without special requirements, such as machine tools, pumps, fans, compressors,  circuit breakers , etc., and therefore can tell from the appearance. Through the motor can be divided into categories according to their functions and controls the motor drive motor; divided into categories according to AC power and DC motors; motor speed and power from the power relationship between the frequency classification can be divided into synchronous motor and induction motor;

Homemade hydrogen station in two ways, one is the use of chemicals hydrogen, the second is the use of water electrolysis hydrogen

Currently the majority of our high-altitude stations compressed hydrogen from the hydrogen production plant, part of the high-altitude station using a homemade hydrogen.  Electric energy meter  station in two ways, one is the use of chemicals hydrogen, the second is the use of water  electric meter  hydrogen production. I got another one hydrogen from water electrolysis hydrogen station, so the hydrogen transport, storage and use of hydrogen process must pay attention to fire and explosion.  Voltage stabilizer  is a flammable and explosive nature of hydrogen gas, hydrogen flame burning in air temperature up to 1500 ℃, the oxygen in the combustion flame temperature up to 2000 ℃ ~ 3000 ℃. Its penetration force, highly penetrating, high temperature, high pressure, it can penetrate very thick plate.

Induction meter only in a very narrow frequency near the frequency range and the voltage

Induction meter only in a very narrow frequency near the frequency range and the voltage and current for the fundamental conditions to ensure the best [for performance. In the case of a distortion of the waveform, the harmonic voltage and current  Voltage stabilizer  the turntable through  Circuit breaker  magnetic flux, causing fundamental changes in the magnetic flux distribution, thereby affecting the G-wave generator driving torque; Also, because the braking torque and flux distribution is almost irrelevant,  Electric energy meter  rotational speed changes, power metering errors. The harmonics of the power meter measurement error of j depends on how much content Mu are waves, harmonic current direction and other factors.

In-depth systematic study of harmonics on the power meter and electric energy metering is essential

Meter is a core part of energy metering and basic measuring tools, and its measurement accuracy is directly related to energy metering accuracy. Therefore, in-depth systematic study of  Electric energy meter the power meter and electric energy metering is essential. Based on academic research and engineering applications, research and analysis induction meter structure and working principle is proposed based on an improved air circuit breaker  energy metering errors nonlinear mathematical model; analysis in the study of electronic power table and its time-division multiplier structure and  Voltage stabilizer , based on the multiplier was first established by the simulation model; through computational analysis and simulation analysis, the harmonics induction meter and electronic energy meter accuracy factors and the impact of a more comprehensive, in-depth analysis;

Electricity production automation, energy metering and intelligent power management has been widely used

Electronic energy meter is also known as static energy meter is a rapid development in recent years, a new type of energy meter, with the economic development needs of the electricity market, as well as development of microelectronics  air circuit breaker , electronic energy meter with its unique features, in the power production automation, energy metering and intelligent power management has been widely used, but increasingly high demand. For the correct measurement of energy and  Electric energy meter , electronic energy meter has played an extremely important role. Electronic energy meter is a kind of works with conventional induction meter completely different new electrical measuring instruments, with the development of electronic technology, improving the quality of electronic components.

Some have important academic significance and practical value of the results

Comprehensive in-depth summary of the relevant literature, based on the power transformer insulation for the structure and design of electromagnetic theory and computational problems, to carry out a lot of research and calculation, made ​​some important academic significance and practical value of the results. With the rapid development of  Air circuit breaker technology and the electromagnetic field numerical analysis method perfected, so that the transformer insulation structure optimization and automatic design of  Electric energy meter  solutions become possible. Based on the finite element method and sensitivity analysis techniques, focusing on the overall structure of power transformer insulation arrangement, electrode shape optimization and design of electromagnetic program automatically issues.

Intelligent information processing approach is the key technology research

Power transformer fault diagnosis methods include power transformer condition assessment, fault diagnosis and fault prediction. Data for the power transformer fault diagnosis of small samples, poor information characteristics, study the theory of intelligent information processing techniques mainline power transformer fault diagnosis methods, the main contents are as follows: ⑴ intelligent  mcb circuit breaker processing method of key technologies. In the study analyzed the key technology of intelligent information processing theory, based on the proposed intelligent  Electric energy meter theory to the main line of the power transformer fault diagnosis technology solutions. ⑵ power transformer condition assessment algorithm. Determine the power transformer condition assessment index system based on cloud model study whitening weight function of gray clustering analysis and improved combined weighted gray target theory of power transformer condition assessment model, a priori knowledge and experimental analysis through joint optimization of cloud model parameters, research at normal power transformers for the bull's-eye of the improved data weighted gray target theory algorithms, optimization status classification.

The use of a great variety of electrical switching element controlling the movement of the machine

In machine tools, the use of a large variety of electrical switching element controlling the movement of the machine. Especially in the machine work area for electrical switch, because poor working conditions, protection of the switching elements have certain requirements. Electrical component protection at home and abroad generally IPXX graded. From a lot of the actual use of the situation: some current protection of  electri cenergy meter  can not be done with its own label corresponding to the IP level. It is important that the switch itself is not the problem but rather the waterproof test standards and the difference between the actual use. Speaking from an instance of the following, in order to explain this situation and analyzed. A safety  air circuit breaker  capability due to inadequate equipment failure my company a combination of Italian-made CNC machine tools during machining,  Electric energy meter  exchange when the door is closed, after rising rotary table should be rotated after a station stop and whereabouts but suddenly stopped rising after the rotation is not the case, the operator immediately press the emergency stop, but in vain, the operator immediately turn off the main power tools, was able to stop. Eventually found the problem because inadequate protection safety switch lock protection class IP65.

Improvement of the original low-voltage distribution box wiring capacitor bank

The low-voltage electrical distribution box by fuses, AC contactor, residual current operated protective devices, capacitors and gauges and other components. These low-voltage electrical appliances according GB1497 "low-voltage electrical basic standards" for design and manufacture, and their  Electric energy meter  provisions were made under normal  electri cenergy meter : ambient air temperature does not exceed the upper limit of 40 ℃; 24h average ambient air temperature does not exceed 35 ℃ ; ambient air temperature limit of not less than -5 ℃ or -25 ℃.
Rural Reconstruction  circuit breakers  box in the outdoor run, it is not only subject to direct sunlight, high temperature, while the operation itself will generate heat, so hot in the summer season, the cabinets will reach temperatures above 60 ℃, when the temperatures much higher than the predetermined temperature of these appliances, which occur due to the distribution box failures caused by overheating of electrical components.

Distribution line and distribution transformer branch lines most commonly used as a short-circuit protection switch

Drop-out fuse is 10kV distribution line and distribution transformer branch lines most commonly used as a short-circuit protection switch, which has an economic, easy to operate, to adapt to the outdoor environment, and other circuit breakers, are widely used in 10kV distribution lines and distribution transformer primary side and for equipment as a protective cast, cut operating purposes. Drop-out fuse 10kV electric transformer installed in the branch line, which could reduce the power range, because there is a clear break point, with the isolation switch Electric energy meter to repair lines and equipment segment to create a safe working environment, increase the maintenance personnel security.

Security and other aspects of superiority is unmatched contact switch

Non-contact switch in electromagnetic compatibility, reliability, security, and other aspects of the superiority of the contact switch is unmatched. Non-contact switch is used to control thyristor, so it is done internally in the PN junction turn-on and shut-off, and there will be no spark, make up the contact switch mcb circuit breaker, when there is not Electric energy meter to avoid excessive current occurs spark or breakdown of the high voltage circuit, the air, resulting in malfunction. Non-contact switch is also very good air circuit breaker to high pressure, such as the number of large motor starting, turning the rotor inertia from rest becomes very large, resulting in large starting current (roughly equal to the short-circuit current), shutdown due to inertia continue to operate, will result in very high voltage, non-contact switch can be applied to this.

Containing both continuous dynamic power system, also contain discrete dynamic

Containing both continuous dynamic power system, also contain discrete dynamic. Switch status changes caused by changes in the power system network architecture, is a typical discrete event dynamic process. The entire network topology analysis of the problem is decomposed into mcb circuit breaker unit of analysis, Electric energy meter unit of analysis colored Petri net model, when the switch state changes, simply re-calculating the effects of changes in the switching state of the bus, can improve the efficiency of topology analysis. Through the above algorithm Circuit breaker and analysis, we can see their own characteristics, but in isolation, any one of which can not be used to achieve intuitive, effective, fast and so comprehensive distribution network topology requirements. Therefore, to fully draw on previous research results, according to the actual situation to achieve the distribution network topology analysis.

Distribution networks generally use closed loop design, open-loop operation, its structure radially

In the urban grid system, the primary network is 110KV and above voltage level of the grid, the main connection mcb circuit breaker the high pressure (220KV and above) the role of the grid
Distribution refers to the voltage level of 35KV and below the grid, the role is to give the city all kinds of electricity load distribution stations and power supply
Distribution networks generally use closed loop design, open-loop operation, its structure radially. mcb circuit breaker line diameter Electric energy meter the power lines, resulting in the distribution network R / X bigger. Because distribution line R / X is large, so that the transmission grid in these algorithms commonly used in the distribution network power flow calculation is difficult to guarantee the convergence.

Transformer room set point should consider the following factors

(1) should be close to load centers, distribution shorter the distance, the smaller the power loss and voltage drop, construction costs, materials fee more provinces.
(2) a short distance supply, power supply easy. When existing buildings or the construction of buried objects cause obstacles, should be considered supply routes, the study identifies the location of the power distribution room.
(3) surrounding electric meter. Should not be set in a dusty place, hot and humid places, vibration of the machine next to salt damage around the device or is likely to suffer serious flooding and tidal areas. But when this is unavoidable, appropriate measures should be adopted. Also can not be set flammable, corrosive gases and retention areas may occur. Distribution room Electric energy meter in places like 0,1,2, or explosion-proof electrical products should be structured, or explosion-proof construction. Such local distribution room set from the ground floor to the first floor height should be in 600mm or more.
Outdoor box-type substation and power transformers should adopt the cable into the outlet. The distribution of the aid should be established production houses.
(4) Equipment and out easily. In the equipment updates, additions, repairs, vehicle shall be easily accessible.
(5) easy expansion. Taking into account the future increase in the load equipment, capabilities, installation location should be left the possibility of extension.
(6) should be avoided provided in areas of poor foundation, can not be avoided, you need to improve foundation or piling construction. In addition, the location of the power distribution room set up to deal with its neighbors had no effect, no effect on the future development.

Distribution room planning to completion, roughly step

From the planning to the completion of the power distribution room, roughly as follows: Determine the size, structure; decided to set up lAir circuit breaker detailed construction; inspection, circuit breakers architectural drawings; construction; completion of construction and acceptance; distribution room equipment construction, such as lighting, air conditioning, fire alarm, etc.; final acceptance.
Substation should be designed Electric energy meter project development plan, so far, the recent combination of the recent main, correctly handle the recent construction and long-term development of the relationship may be appropriate to consider expansion. Substation must be designed from the overall situation, balanced, according to the nature of the load, electricity capacity, the engineering characteristics of regional energy supply conditions and the requirements of environmental protection into account to determine design.

Internal current transformer in series with one end

Uses the output string into the current transformer wires inside an electrical equipment other end  mcb circuit breaker  circuit breakers, input connecting an ammeter in s1 s2 ammeter connected to the other end. Generated when electrical work on the ammeter current  Electric energy meter  spread through pointer display current. But at this current must be multiplied by the number of current transformer ratio is the actual value of the current work is the electrical current.

Outside the cassette clever use of magneto optical current transformer current sensing structural characteristics of glass

Outside the cassette clever use of magneto optical current transformer current sensing structural characteristics of the glass, take double half-ring clamp structure in the tank circuit breakers, enclosed combination of electrical appliances and other  Circuit breaker  housing mounted externally, opening up a closed electrical the new direction of current sensing technology, rely on technological progress to break the foreign equipment and technology for the leading power  Electric energy meter  of the situation. Based on magnetic rotation effect, outside the cassette optical current transformer measurement accuracy, precision smart grid to meet the steady-state and transient measurement needs; small size, light weight,  electric meter , in line with the development trend of intelligent substation primary equipment; non-contact with high voltage can be charged to maintenance, operation and better security; clamp in a closed electrical housing exterior, installation, maintenance and replacement easier.

Within the protected transformer short-circuit failure caused by the saturation

Occurred in the area to be protected transformer saturation caused by short-circuit fault is not easy with the differential and restraint currents ratio distinction. This is because the differential and restraint currents measured value will be affected, and they will immediately satisfy the protection ratio of operating conditions. At this time, the ratio of the operating characteristics of the differential  Electric energy meter  effective, the failure rate differential protection features to meet operating conditions.
That occurred outside the protected transformer fault, it produces a large short-circuit currents caused through saturation will have a great false differential current, which in the case of each measuring point is not the same saturation is more serious. If the magnitude of the resulting operating point falls triggered by the ratio of the operating  electric transformer  of the differential protection zone, and do not take any measures to stabilize the differential protection ratio, the ratio differential protection will malfunction. Calculated according to Kirchhoff's current law to get the amount of current transformers on each side of the differential current, basic balance at the beginning of a short time, only the current imbalance will produce a smaller, until saturation will produce a greater differential current, causing the transformer differential protection. How to identify the current transformer saturation .

Analysis of the hollow spiral coil sensing principle two structures

Hollow spiral coil emphatically analyzed two structures sensing principle and the mechanism of resistance to external magnetic interference deduced their mutual inductance is calculated and studied to explore the practical engineering of a variety of air-core coil spiral structure; affect spiral hollow coil performance factors were analyzed, and the corresponding measures to solve; designed experimental model, and thus the experimental testing and research; Finally, the study explored the hollow spiral coil electronic current transformers at high pressure, the low pressure  Electric energy meter  technology devices and made PCB planar spiral hollow coil can be used as the focus of future research and application. Theoretical analysis and experimental results show that: the hollow spiral coil current sensor  electric meter  frequency bandwidth, fast response, anti-electromagnetic interference capability, and can accurately measure small currents, as an electronic energy meter and relay dedicated current transformer Similarly, since no magnetic saturation, but also for medium and high voltage high current measurement system. The patented technology, which for the development of new electronic current transformer has important theoretical significance and practical value.

Electrical equipment requires a supply voltage stability

it is a can automatically adjust the output voltage of the power supply circuit or power supply equipment, and its role is to volatile and non-use of electrical equipment requires a supply voltage stabilized at its set value range, the various circuit or electrical equipment can be rated working voltage to Electric energy meter. Series AC automatic voltage regulator, the contact auto transformers, servo motor, automatic control circuit, etc., when the grid voltage instability or load changes, the automatic mcb circuit breaker control circuit voltage regulator servo motor drive signal, adjust the auto-carbon brush regulator position so that the regulator adjusted to the rated output voltage and mcb circuit breaker a steady state. The series regulator product variety, full specifications, beautiful appearance and so on. With waveform distortion, high efficiency, reliable performance, long-term operation and other characteristics, the regulator has a short delay, overvoltage protection function, according to the needs of users can be added with the long delay undervoltage protection.