Skip to main content

Digital Protection

Digital Protection

In a large interconnected power system, having large sizes of alternators and higher capacity transmission lines, the protective relays and circuit breakers should operate as fast as possible to improve the transient stability of the system. The transients consist of a large number of harmonic currents and voltages with the addition of doing. component, 

Both Fundamental components of current and voltage are with inherent large time delays required. For protective relaying purpose applications. Earlier, analog filters were used. The digital filters extract the fundamental components from the transient in about half a cycle.

The reasons for using digital protection relaying schemes in place of analog protection offer many advantages over analog protection. As minicomputers, microprocessors, and microcontrollers are developing protective relaying schemes have been developed on these devices. These devices offer low burden, filter in operation, low maintenance, and are not affected by external causes such as mechanical shocks and vibrations.

Digital protection Advantages

(a) Functional flexibility: A variety of protection functions such as distance relay characteristics (mho, ohm, quadrilateral, parabolic, etc.) can be obtained with a slight change in hardware and software.

(b) Low cost: The cost of equipment in digital protection is low.

(c) Self-checking functions: By using proper software, the hardware faults can be easily diagnosed.

(d) Easy communication: Using a microprocessor-based relay, an easy interface with digital communication equipment is possible.

(e) System integration and digital environment: The system of the digital relay can be easily integrated with other devices.

(f) Longer life: The performance of digital protection equipment does not change because of the aging of components.

Popular posts from this blog

RS Aggarwal Aptitude Book PDF Free Download

RS Aggarwal Aptitude Book PDF Free Download RS Agarwal Aptitude Book PDF Free Download: Quantitative Aptitude by R.S Aggarwal is a standout amongst the most inclining books among the hopefuls getting ready for Bank PO, PO, MBA, RBI, IBPS, CAT, SSC, IAS, PSC, Hotel Management, Railway Recruitment Exams, and other aggressive and placement tests. This book is suggested by different specialists in this field. This book covers relatively every theme which is being requested for the focused exams. On the off chance that you are looking to Download RS Aggarwal Quantitative Aptitude PDF's most recent version with the expectation of complimentary then you appear to be at the correct place.    Download PDF  RS Aggarwal Reasoning  In English RS Agarwal Aptitude Book PDF Free Download This book covers Problems on Surds and Indices, Simplification, Numbers and Ages, Pipes and Cisterns, Boats and Streams, Problems on Trains, Simple and Compound Interests, Time and Work, Permutations and Combina

Comparison between VSI and CSI

Comparison between VSI and CSI In power electronic systems, inverters are an essential component that converts direct current (DC) into alternating current (AC). There are two main types of inverters used in power electronic systems: Voltage Source Inverters (VSI) and Current Source Inverters (CSI). Both have their own unique advantages and disadvantages, and the choice of which to use depends on the specific application and the desired outcome. Comparisons between voltage source inverters and current source inverters are as follows. In voltage source inverters, the input voltage is maintained constant and the amplitude of the output voltage does not depend on the load. However, the waveform of load current, as well as its magnitude, depends upon the nature of load impedance.  In current source inverters (CSI), the input current is constant but adjustable. The amplitude of output current from CSI is freelance of the load. However, the magnitude of output voltage and its undulation outp

Limitations of Terzaghi Theory

Limitations of Terzaghi Theory The value of the coefficient of consolidation has been assumed to be constant.  The distance d of the drainage path cannot be measured accurately in the field. The thickness of the deposit is generally variable, and an average value has to be estimated.  There is sometimes difficulty 1n locating the drainage face, and sometimes thin previous seams that can act as good drainage faces are missed in the boring operations. The equation is based on the assumption that the consolidation is one-dimensional. In the field, the consolidation is generally 3-dimensional. The lateral drainage may have a significant effect on the time rate of consolidation. The initial consolidation and secondary consolidation have been neglected. Sometimes these form an important part of the total consolidation. In actual practice, the pressure distribution may be far from linear or uniform.