An improperly terminated line will have a standing. It blocks the high frequency carrier waves 24 khz to 500 khz and let power waves 50 hz 60 hz to pass through. Development of an electrical substation equipment performance. The bidder shall also specify the bandwidth of the untuned line traps within which the tapping loss shall not exceed 2. For this tapping loss the characteristic impedance of the h.
The wave trap is put in use alongwith a coupling capacitor or a capacitor voltage transformer cvt both of which possesses high capacitance value. Local, state, and federal requirements there are no known government agency requirements and the filing status at the time of. Both work handinhand implementing power line carrier pilot protection. Its main purpose is to provide support for rigid bus as it travels though the substation. Wave trap it trap the high frequency communication signals sent on the line from the remote substation and diverting them to the telecom teleprotection panel in the substation control room. Presentation upptcl 400kv substation motiram adda, gorakhpur. It is connected in series with the transmission line. If protection is not installed then you can watch them explode. It is basically an inductor of rating in milli henry approx 1 milli henry for 220 kv 1250 amp. Stones are provided in the substation to a to avoid fire accident by draining oil from transformer if leaks b to avoid growing of weeds and plants c to provide insulation d all the above. This forms a carrier communication network throughout the transmission network, to communicate between substations.
Presentation upptcl 400kv substation motiram adda, gorakhpur free download as powerpoint presentation. Line traps are used in transmission and distribution networks around the world. It seemed we had the equipment, but we were missing two. Mar 05, 2019 wave trap is nothing but a choke coil which chokes out high frequency carrier signal, as the impedance offered by inductor wl will be high which will not allow the high frequency carrier signal to enter into the substation. Wave trap is installed in the substation for trapping the high frequency communication signal sent on the line from remote substation and diverting them to the telecom panel in substation control room. Wave trap is installed in the substation for trapping the high frequency communication signal sent on the line from remote substation and diverting them to the. A piece of protection also has to do with safety of personnel for instance fast trip settings, disabling breaker reclose, arcflash settings etc. It is connected to the main incoming feeder so that it can trap the waves which may be dangerous to the instruments here in the substation. The inductive reactance of the line trap presents a high reactance to highfrequency signals but a low reactance to mains frequency. Dec 05, 2018 wave trap is a basket looking coil having high inductance. It is basically an inductor of rating in millihenry.
A cheat sheet for electrical substations distran wood. Power substation design calculations a checklist of 18. What it does is trapping the high frequency communication signals sent on the line from the remote substation and diverting them to the telecomteleprotection. Development of an electrical substation equipment performance database for evaluation of equipment fragilities final report april 1, 1999 prepared for pacific gas and electric and the pacific earthquake engineering center by thalia anagnos department of civil and environmental engineering san jose sate university san jose, ca 951920083.
A coupling capacitor in substation is used for power line communication purposes. Abstract the objective of this project to design substation equipment by means of sizing of equipments like lightning arrester, wave trap, cvt, current transformer, isolator, circuit breaker, transformer etc. An electrical substation is a subsidiary station of an electricity generation, transmission and distribution system where voltage is transformed from high to low or the reverse using transformers. Mar 15, 2020 the wave trap connected in series with the feeder line is a kind of reactor. Hence a line trap unit wave trap is inserted between busbar and connection of coupling capacitor to the line. The three main types of structures found inside a substation include. The line trap shall be provided with a protective device which will be designed and. The power line carrier communication plcc uses the existing power infrastructure for the transmission of data from sending to receiving end. These high frequency signal should not be coming on the buses as these may damage the equipments. Electrical substation components and their workings. May 24, 2017 wave trap is a parallel tuned inductor capacitor tank circuit made to be resonant at desired communication frequency. The key steps in the substation designing include switchingsystem, planning and placing of equipment, selection of components as well as ordering, support of engineers, structural design, the design of electrical layout, protection of relay, and major apparatus ratings.
Single circuit in line strain with wave trap wood pole structure. The substation in bhinmal, jalore343029, rajasthan is one of the largest power grids in the state of rajasthan and the northwest area india. Hence a line trap unit wave trap is inserted between busbar and connection of. Highvoltage substations, the node points of todays complex power transmission infrastructure, play a key role in meeting this demand safely and reliably.
The bandwidth of a line trap is the frequency range over which the line trap can provide a certain specified minimum blocking impedance or resistance. Line trap line trap also known as wave traps a critical component of plcc. To cliffs natural resources substation project opsb case no 1894elbln november 7, 2018. Capacitor voltage transformer cvt or capacitor coupled voltage transformer ccvt is a switchgear device used to convert high transmission class voltage into easily measurable values, which are used for metering, protection, and control of high voltage systems additionally, a cvtccvt used as coupling capacitors for coupling highfrequency power line carrier signals to the transmission line. They are tuned to block a carrier frequency that is injected into the transmission line. Apr, 2017 chapter10 wave trap line trap is also known as wave trap. This reactor may have secondary winding to obtain power for auxiliary supply to the substation. Familiarization of 400 kv, 220 kv, 2 kv substation equipment. The electrical substation design is a complex method with full of engineer planning. Inside a substation is like its own unique power world where every pole, bolt, stand, surge arrestor or structure plays its own individual role. Erection of wave trap in 220 kv switchyard, transmission line. Power line carrier communication plcc electrical4u. Wave trap filters the high frequency communication signals sent on the line from the remote substation and diverts them to the telecomteleprotection panel in the substation control room through coupling capacitor and lmu. Line traps are cylinderlike structures connected in series with hv transmission lines.
The secure communication solution for critical infrastructures. Line trap is connected in series with transmission line. Design of substation equipment sizing, testing and commissioning. All rus borrowers rus electric staff effective date. The function of this trap is that it traps the unwanted waves. These high frequency damages the power system components which are designed to operate 50 or 60 hz. It reduces corona losses in transmission lines in power system. This reactor along with the coupling capacitor of the line creates a filter circuit to block the frequencies other than power frequency. Center to start a substation predictive maintenance program. The coil of the line trap provides a low impedance path for the flow of the power frequency energy. Tennessee valley authority, chattanooga, tennessee. The main function of the line trap is to provide a high impedence at powerlinecarrier frequencies 30500 khz while introducing negligable impedence at power frequency 50 or 60 hz. A blog about electrical equipment protection and relay concepts like transformers, motors, capacitor bank,switchyard equipments. The line trap offers high impedance to the high frequency communication signals thus obstructs the flow of these signals in to the substation bus bars.
Universal power line carrier system etl600 r4 etl600 is an advanced plc solution for the transmission of speech signals, data and protection commands over highvoltage transmission lines. A mini project report on operation and maintenance of 2202kv substation submitted in partial fulfillment for the award of the degree of bachelor of technology in electrical and electronics engineering submitted by v. What it does is trapping the high frequency communication signals sent on the line from the remote substation and diverting them to the telecomteleportation panel in the substation control room through coupling capacitor and lmu. Major substation equipment learn the purpose, cost, and lead time to procure. The main coil is designed to carry the rated power frequency current as well as to withstand the fault. The most important of any substation is the grounding earthing system of the instruments, transformers etc. A firstenergy company to cliffs natural resources substation project 4906605 b10d. Line trap wave trap connected in series with the power transmission line. Power line carrier communication plcc electrical concepts. Wave trap is a basket looking coil having high inductance. What it does is trapping the high frequency communication signals sent on the line from the remote substation and diverting them to the telecomteleprotection panel in the substation control room through coupling capacitor and lmu. The wave trap is put in use alongwith a coupling capacitor or a capacitor voltage transformer cvt both of whic. It is used in power line carrier communication plcc system of substation. The technical specification for the civil engineering and building design and construction of secondary substation or 2275400kv substation equipment enclosures that form an integral part of primary.
In this article, i will share 18 design studies or calculations that will set you up to create a beautiful substation. It is connected in series with the power line and prevents carrier current from entering to the power equipment. Transformers inside a substation change the voltage levels between high transmission voltages and lower distribution voltages. Line traps prevent transmission of these high frequency signals to unwanted directions without loss of energy at power frequency. Wave trap is used to create high impedance to the carrier wave high frequency communication entering in to unwanted destinations typically substation. Wave trap consists of a number choke coils connected in series. Maintenance and operation of an electrical substation of. General specification for the civil engineering and. Surge arresters or lightning arresters discharge the over voltage surges to earth and protect the equipment insulation from switching surges and lightning surges.
Wherever you are, siemens is your reliable partner for the onestop planning and construction of customized, stateoftheart highvoltage. Rigid bus is stiff and will not move around during weather events. Cvts in combination with wave traps are used for filtering highfrequency communication signals from power frequency. The figure 1 shows a basic plcc network used in power substations. Wave trap line trap what is wave trap what is line. The most important of any substation is the grounding.
Capacitor voltage transformer cvt or ccvt construction. In a delta connected power system, a star point or neutral point is created by using zigzag star connected 3 phase reactor, called an earthing transformer. Surge arresters are generally connected between phase conductor and ground. It is the effort to utilize the same transmission line between two substation for the purpose of communications 22 23. It is common practice to install wave traps at each end of a two terminal line. The line trap is connected in series with the transmission line. A substation is an assemblage of equipment where electrical energy is passed in order to be stepped up or stepped down.
Single circuit inline strain with wave trap wood pole structure exhibit 6 single circuit light angle wood pole structure. Line traps are connected in series with hv transmission lines. A line trap, also known as wave trap, or highfrequency stopper, is a maintenance free parallel. Wave trap is installed in the substation for trapping the. Wave trap is nothing but a choke coil which chokes out high frequency carrier signal, as the impedance offered by inductor wl will be high which will not allow the high frequency carrier signal to enter into the substation. Schematic drawing of complete installation of equipment at each substation. Erection of wave trap in switchyard, transmission line, 220 kv. Line traps are seriesconnected to the transmission lines, and are designed to withstand the rated power frequency current and the short circuit current to which the lines are subjected. How does the wave trap work at an electrical substation. This bulletin is an update and revision of previous rea bulletin 651, design guide for rural substations revised june 1978. Plcc system consists of three parts the terminal assemblies include the receivers transmitters and protective relays. Tapered tubular design is typically efficient and economical in deadend andstatic pole situations when compared to aisc standard shape structures.
Line tuner, on the other hand, is a bandpass filter. Some plc maintenance will require taking the transmission line out of service. Wave trap is an instrument using for tripping of the wave. Report on industrial summer training on 220 kv substation. The recommendations of this document apply to substation structures that support electrical equipment, rigid bus, and electrical cableswires. Wave trap is used for trapping the high frequency communication signals sent on the line from the remote substation and diverting to the telecomtele protection panel in the substation control room through coupling capacitor and lmu.
What is a wave trap in a substation and how does it work. This forms a carrier communication network throughout the transmission network. Wave trap wave trap are used in power system for carrier communication. This prevents carrier signals from being dissipated in the substation or in a tap line or branch of. In a substation surge arrester is located at the starting of the substation as seen from incoming transmission lines and is the first equipment of the substation. Since the power flow is rather large at times, the coil used in a line trap must be large in terms of physical size. Line trap is a device which prevents the highfrequency carrier signals to enter the substation side. Apr 26, 2012 the purpose of the substation structure design guide is to provide a comprehensive document for the design of outdoor electrical transmission substation structures. The cvt is installed at a point after lightning arrester and before wave trap. When two waves, traveling in opposite directions on a transmission line pass, they create a standing wave.
It is designed to carry the rated power frequency 50 hz or 60 hz current, as well as to withstand the substation fault currents. What does it take to design a masterpiece of a substation. The plcc equipment and wave traps shall be installed at the respective ends of the. Highvoltage substations highvoltage power transmission. Carrier wave communication uses up to 150khz to 800khz frequency to send the all the communication. Wave trap a device used to exclude unwanted frequency components, such as noise or other interference, of a wave. This type of reactor is mainly used to facilitate power line carrier communication. Bus supports are the most basic structure found inside a substation. Wave trap is a parallel tuned inductor capacitor tank circuit made to be resonant at desired communication frequency. Switchgear equipment capacitors reactors ground switches lightning arresters wave traps. Peguru substation design explained in simple terms. A line trap, also known as wave trap, or highfrequency stopper, is a maintenancefree parallel resonant circuit, mounted inline on highvoltage hv ac transmission power lines to prevent the transmission of high frequency 40 khz to khz carrier signals of power line communication to unwanted destinations. Power substations contain expensive pieces of equipment. Substation equipment in this section we describe the function and operating principles of the following power system components.
Line traps are a key component in plc power line carrier systems used for remote control. Why wave traps are used in any two phases in substation. The high impedence limits the attenuation of the carrier signal within the power system by preventing the carrier signal from being. Substation electrical substation transformer free 30.
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