Power System

Transient Recovery Voltage (TRV) is the voltage appearing across the contacts of circuit breaker after a switching action. Typically, every transient TRV has high amplitude and high frequency. In this post we will be disusing the Effects of Transient Recovery Voltage . For detail on Transient Recovery voltage, read Transient ...
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Power Line Carrier Communication (PLCC) is used for the purpose of protection of line and communication between the two stations. Two different PLCC channels are used for the protection of a single line. This is the reason, you will notice that wave traps are normally installed in R and B ...
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ABCD parameters are generalized parameters of transmission line. These parameters are quite helpful for calculation and analysis of transmission line. In any four terminal network, the input voltage and current can be expressed in terms of output voltage and current provided the network should be passive, linear and bilateral. Fortunately, ...
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Corona has many advantages and disadvantages. Therefore for designing a transmission line, care must be taken to have a balance between the advantage and disadvantage of Corona. Advantage of Corona Following are some of the advantage of corona: The effective diameter of power conductor increases due to Corona. How? Actually, ...
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Transposition of Conductors refers to the exchanging of position of conductors of a three phase system along the transmission distance in such a manner that each conductor occupies the original position of every other conductor over an equal distance as shown in figure below.Advantages of Transposing Transmission Line:When conductors are ...
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Harmonic voltages and currents in a Power System are a result of non-linear electric loads.In a normal AC Power System, the current varies sinusoidally at a specific frequency, usually 50 or 60 Hertz. When a linear electrical load is connected to the system, it draws a sinusoidal current at the ...
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Anti Pumping Relay is used in a Circuit Breaker to indicate the spring failure of TNC i.e. Trip Neutral and Close (TNC) switch. TNC switch is used to manually Open and Close the Circuit Breaker either from Local or Remote. This is called TNC switch as it has three positions ...
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Autoreclosing is a feature which is provided in the Line Circuit Breaker so that Single Pole of a Breaker may trip and close when command is given to do so.Based on the time duration of fault existing in the Power System, faults can be classified into three categories asTransient FaultSemi-Transient ...
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A Transmission Line classification based on its length are Short, Medium and Long lines. The length of line is calculated between the two substations of concern. If the length of line is less than 80 km then it is said to be Short Transmission Line. The length of Medium Transmission ...
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Cable capacitance is the formation of capacitance between the charged core or conductor and the earthed lead sheath. Therefore it is quite important to have an idea of how the cable capacitance varies or the factors affecting its value. Calculation of Cable Capacitance A single core cable is similar to ...
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The application for capacitor voltage transformers, CVTs, is the same as for Inductive Voltage Transformers. The main function of a Capacitive Voltage Transformer is as follows:   To transform currents or voltages from a usually high value to a value easy to handle for relays and instruments. To insulate the ...
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Heat is the prime cause which leads to electrical insulation deterioration. Some possible causes of heat generation in the electrical insulation are as follows: Heat is generated in the electrically stressed insulation, due to dielectric loss and conduction currents. Heat is imparted to insulation by the neighboring current carrying parts ...
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What is Circuit Breaker?Circuit Breaker is switch capable of making or breaking the circuit under no-load as well as on-load condition. It can make or break circuit either manually or by remote control. A Circuit Breaker in conjunction with Relay can break the circuit under fault condition.You may also like ...
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Power from Generating Station to the Load Center is transmitted by 3 phase 3 wire system. The comparison between 3 phase Power Transmission and 1 phase Power Transmission is done assuming the Power to be transmitted, Voltage, Distance and loss to be same.From the economy point of view the weight ...
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Electric Power can either be transmitted by means of AC or DC. Each system has their advantages and disadvantages. Therefore it is very crucial to have a comparative study of their merit and demerits and then decide which method should be adopted to transmit power.Advantages of DC Transmission:1) The high ...
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