Substation secondary cable has extremely important problem of electromagnetic compatibility

With increasing voltage levels and secondary equipment more and more decentralized, substation secondary circuit already in a strong electromagnetic environment in recent years has multiple causes substation DC system disruption caused by the secondary  electri cenergy meter  no fault tripping accidents, which caused a serious threat to the grid, affecting the safe and reliable operation of power systems. Therefore, the study of secondary cable substation electromagnetic compatibility  Voltage stabilizer  a very important theoretical significance and practical value. This paper focuses on the finite difference time domain method based on  air circuit breaker  transmission line theory and electromagnetic interference on the secondary substation cable coupling situation.

Buried cables and coaxial with frequency-dependent parameters such as multi-conductor transmission line transient electromagnetic process FDTD calculation method

Get transfer impedance and transfer admittance amplitude-frequency characteristics, and the phase-frequency characteristics can be obtained, and the test system is relatively simple; applies not only to single-core shielded cable can also be used for multi-core shielded cable transfer impedance and transfer admittance measurement . With other methods of  electric meter  results were compared with measurements to verify the correctness of this measurement method. Proposed for research overhead lines, underground cables and coaxial cables with frequency-dependent  air circuit breaker  as multi-conductor transmission line transient electromagnetic process FDTD calculation. The main research results to establish a substation switching transients field time-domain simulation model, based on the spark  Voltage stabilizer , the isolation arc discharge channel switching operation, time-varying resistance and inductance formulas. A typical substation switching transients by fitting the measured field data obtained arc discharge channel switching time-varying resistance range. Based on this model to study the impact of switching transients field intensity and rise time of a variety of parameters for EHV and UHV substation switching transients field study provides a theoretical basis.

Secondary equipment electromagnetic compatibility problems have become increasingly prominent

With the ultra-high voltage grid, intensive direction and microelectronics technology in the wide application of the secondary equipment, substation electromagnetic Voltage stabilizer , secondary equipment, electromagnetic compatibility problems have become increasingly prominent, research substation switching transients and the effect on two times the cable coupling mechanism having a weightTo  mcb circuit breaker  and application value. This paper, based on finite-difference time-domain (FDTD) method to study the field of substation switching transients time-domain  air circuit breaker , substations and cable trench soil transient electromagnetic field distribution, bounded wave electromagnetic pulse (EMP) simulator transmission line designed for near-field Finite length cable coupling mechanism, as well as the transient electromagnetic field coupling cable numerical methods.

Transfer admittance and unit-length parameters broadband measurement method and short-circuit fault substation

Research substation transient electromagnetic environment electromagnetic coupling problems secondary cable has an extremely important theoretical significance and practical value. In this paper, the National Outstanding Youth Science Fund Project "EMI coupling mechanism," focuses on the transfer impedance of shielded cable,  mcb circuit breaker  and unit-length parameters broadband measurement methods and substation system short circuit fault, lightning and switching operation on the secondary  Circuit breaker  electromagnetic coupling mechanism, through the measurement results and other literature comparing the calculated results to verify the measurement methods and calculation methods herein correctness. A new measurement shielded cable transfer impedance and transfer admittance easy way.

Multi-rate meter using microcomputer control, you can set up multiple sessions

To rationalize the allocation of electricity, power supply bureau has been implemented on the user's electricity sharing billing system. Electricity users in different periods, the electricity price is also different. The factories and enterprises in order to save energy and  Voltage stabilizer  expenses, but also for departments, workshops and other subordinate departments to implement a time-sharing administration. There are a variety of multi-rate watt-hour meter market sale. Multi-rate  mcb circuit breaker  microcomputer control, you can set up multiple sessions, price, electricity maximum demand can also be set to allow the maximum load, to achieve load control. Existing multi-rate watt-hour meter in common is that each meter at a pre-set period of time to accumulate on the battery and charging.  electric meter  on the meter input and output display device for input and output display settings. Press the button to switch the meter reading personnel electricity or electricity display can also be switched each time readings. The table has a small capacity memory for storing values ​​and the accumulated value of each set of data. This meter is a with data acquisition, data processing and full input and output SCM application system.

Multi-rate meter and time switch constitutes Indexer

Limited period of time each day measuring energy to electrical energy at different rates denominated tables, also known as the timeshare interest rate level meter or meter . Multi-rate watt-hour meter has a number of degrees , respectively, in each of degrees within the prescribed period of time to work out the different measurement periods  Circuit breaker energy tariffs . Using multi-rate watt-hour meter peaks and valleys of electricity can be measured separately , namely billing, is an economical means to regulate the electricity load with effective measures . Multi-rate watt-hour meter energy meter by the agency ,  electric meter  protractor and time switches. The active power integrated over time to measure the AC circuit functional capacity of the meter , also known kWh meter or meter . Power meter is widely used, can be used to measure the energy emitted power plants and a variety of user consumption of electricity , and as  mcb circuit breaker  and collection of electricity basis. Meter is divided into single -phase energy meter and three-phase energy meter , there are some special-purpose power meter, such as multi-rate meter , largest scale , reactive power meter, DC energy meter , standard meter and so on. Induction single-phase energy meter system structure shown in Fig. Voltage element 1 and the current element 2 from the corresponding coil and core components.

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.

Fault Tree Analysis (FTA) to build a power transformer internal fault

Power transformer fault location method of providing practical basis. Analysis of power transformer fault detection technology, to further explore the power transformer internal fault detection and effective way. The use of fault tree analysis techniques (FTA) to build a power transformer internal fault classification  air circuit breaker , will be  electric meter  electric power transformer fault localization studies. Study the characteristics of ant colony algorithm, principles, algorithms and  Voltage stabilizer  model. Pheromone ant colony algorithm, the information heuristic function factor, the number of ants, ant colony algorithm expectations inspired performance factors on the impact of simulation studies.