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Table of contents
- Overhead Conductor Design
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- Indian Journals
- US20080247106A1 - Reduction of Inrush Current Due to Voltage Sags - Google Patents
If a bulletin is available online, clicking the link will bring up the text of the document. Contact customer service for a cable designed to your exact specifications. Power Line Systems, Inc. Our trainers have spent a lot of time in the field. A full complement of overhead conductor sag and tension coefficient data files have been calculated and are available for immediate use in PLS-CADD software by our mutual customers. This value is automatically computed when the power base and the voltage base are entered or modified.
Sheets Sketch. Tailor your resume by picking relevant responsibilities from the examples below and then add your accomplishments. Lihat profil lengkap di LinkedIn dan terokai kenalan dan pekerjaan Suhaimi di syarikat yang serupa. Not all conductors are equal. Lihat profil Suhaimi A. Can you advise us on where to find other software that is capable of designing Alcan SD conductors?.
This is to include field experience related to the construction, maintenance, and troubleshooting of overhead and underground distribution lines. Projects have been constructed with new facilities, upgrades of existing infrastructure, emergency repairs, as well as NERC mandated modifications.
Overhead Conductor Design
Quanta constructs and maintains everything from generating stations, substations, gathering lines, distribution lines to transmission lines of any size. Dry cable designs, ballistic protection and other cable designs are available upon request. I'm having a problem with scaling. Can anyone can provide me the address of any type of training centre regarding this. New transmission line design engineer careers are added daily on SimplyHired. Pls cadd tutorial pdf Free Download for Windows. A default assignment of material distribution parameters. CHA's experts have decades of experience planning, designing, and permitting electrical power delivery infrastructure including overhead and underground transmission lines and substations.
One of the most familiar software in the world is PLS-CADD Power Line Systems Computer Aided Design and Drafting whose overall concept is based on 3D terrain modeling including real model of towers, conductors and other basic components of the overhead transmission lines. The lowest point of the conductor is O. Calculate the length of the catenary on the interval.
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Fiber optic cable fittings drop wire tension clamps. In PLS-CADD, all cable sags and tensions calculations, and consequently all loads and clearance calculations, are made for designated weather cases. Find the actual length of each of the cables in Figure P4. For over 80 years we've been a top provider of telecom, broadband cable, electric power distribution, gas distribution and data center build-outs.
We provided the required field engineering, design survey and construction staking along the major highway. From this model, and always using PLS-CADD, different hypotheses are studied to calculate distan-ces and behavior of the line, according to our clients needs.
Thanx in advance. Risto has 2 jobs listed on their profile. It is a round, all dielectric cable ideally suited for self-supporting drop-type installations as well as in lashed or conduit builds. Start searching!. It started off as a company of one owner cum engineer, one supervisor, one foreman and twelve employees, maximizing their potential and working in a small one room office to, now what we see as a vibrant organization, operating from ten offices around the globe. Call us today to find out more about our engineering and design capabilities.
Sold by the foot cut to length. With the help of client supplied information, these models are created to match your existing line records. These other employers are not participants in the development, ownership or sale of the software and have no responsibility or liability for the software accuracy or performance. Free download pls cadd tutorial pdf Files at Software Informer. PLS CADD is a very powerful overhead line design package calculating pole strengths, automatic pole spotting, sag and tension tables, line profiling, EMF, conductor thermal rating, sequence impedances etc.
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The information contained in this document is the exclusive and proprietary intellectual property of General Cable Corporation, and any reproduction or disclosure, in whole or in part, is prohibited without the express written consent of an officer of General Cable Corporation.
O-Calc-Pro is structural analysis software for utility poles. Tower Loading Calculation 3. Full cracked version, no limit, full functio. Suppose the three curves in Figure P4 represent cables strung at different heights between poles that are meters apart. In the link below you can see a transmission line with tower models in it and later on you will see a tower being analyzed. This site uses profiling cookies to improve your online experience. Transmission Line Design. Makes and manages strategically and financially attractive investments and leads company-wide innovation efforts.
Foundations were designed using PLS-Caisson software. Parkia, Inc. The ends are bent outward to provide stress relief at the critical cable departure areas. It coordinates all parts of line outline into a solitary remain solitary program with a straightforward,. Thereafter, the impedance is removed when the power voltage has reached a predefined point in the power voltage cycle after the power voltage has returned to the nominal voltage The timing of the removal of the impedance from the load after the power voltage has returned to the nominal voltage is specified to as to minimize an occurrence of an inrush current surge flowing to the load according to various embodiments of the present invention.
In this respect, the removal of the impedance from the load is timed at the predefined point on the power voltage cycle of the power voltage In one embodiment, the impedance is removed from the load when the power voltage is less than a magnitude of the capacitor voltage across a capacitor associated with a rectifier, where the load is a rectifier load. In such a scenario, given that the line voltage is rectified, then it can be said that the impedance is removed from the load when the absolute value of the magnitude of the power voltage is less than a magnitude of the voltage across the capacitor associated with the rectifier of the load.
At such time, the respective diodes in the rectifier are reversed biased when the absolute value of the magnitude of the power voltage is less than the magnitude of the voltage across the capacitor associated with the rectifier of the load. Consequently, there is no inrush current when the absolute value of the magnitude of the power voltage is less than the magnitude of the voltage across a capacitor associated with a rectifier of the load.
Ultimately, in this scenario, the capacitor associated with the rectifier is charged when the normal peaks of the rectified power voltage are applied to the capacitor, rather than experiencing an instantaneous change in the voltage as illustrated by the voltage differential V D depicted in FIG. In an additional alternative, the impedance is removed from the load at approximately a zero 0 crossing of the power voltage that occurs after the power voltage has returned to the nominal voltage after the end of a voltage sag In another embodiment, the impedance may be removed from the load at approximately a first one of the many zero crossings that occur after the power voltage as returned to the nominal voltage This is advantageous as the power is returned to the load as soon as possible but in a manner that minimizes the possibility that a significant inrush current will occur.
In yet another embodiment, the impedance may be removed from the load at a point on the power voltage cycle that substantially minimizes the differential V D between an absolute value of the magnitude of the power voltage and a magnitude of the voltage across a capacitor associated with a rectifier of the load.
In this respect, if the power voltage returns to the nominal voltage at a location in the power voltage cycle such that the magnitude of the power voltage is close to the voltage across the capacitor so that minimal inrush current may result, then the impedance may be removed potentially even in a case where the power voltage is on an upswing and is greater than the voltage across the capacitor, as long as the voltage differential V D is small enough so as to result in an acceptable amount of inrush current to the load.
In such a case, a maximum voltage differential V D may be specified that results in a maximum allowable inrush current that could be applied to the load, where the impedance would not be removed if the actual voltage differential V D is greater than the maximum voltage differential V D specified. As depicted in the graph of FIG. With reference next to FIG.
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The power voltage FIG. The power voltage may be received from a typical outlet or other power source as can be appreciated.
Indian Journals
The current limiting circuit includes a transient voltage surge suppressor that is coupled across the input nodes In addition, the current limiting circuit includes a zero crossing detector , a sag detector , and a gate drive The power voltage is received as an input into both the zero crossing detector and the sag detector The output of the zero crossing detector comprises a zero crossing signal that is applied to the gate drive The output of the sag detector is also applied to the gate drive The gate drive controls a thyristor and a relay In this respect, the gate drive controls whether the thyristor and the relay are turned on or off.
The relay couples the input nodes to a load The thyristor couples the input nodes to the load through a resister R T. In the embodiment depicted in FIG. The load as depicted in FIG. The rectifier includes the diodes and the rectifier capacitor In addition, the load may include other components that receive DC power as can be appreciated.
Alternatively, the load may be an inductive load or other type of load. Next, a general discussion of the operation of the current limiting circuit is provided according to one embodiment of the present invention.
US20080247106A1 - Reduction of Inrush Current Due to Voltage Sags - Google Patents
To begin, assume the power voltage comprises a nominal voltage is applied to the load and suddenly experiences a voltage sag FIG. Assuming that the voltage sag lasts a predefined threshold of time where the capacitor voltage FIG. During steady state operation of the load, the relay is in a closed position and the power voltage is applied directly to the load through the relay Given that the relay is a direct electrical connection, it presents the path of least resistance for the current flowing to the load Consequently, the current bypasses the resistor R S.
During the steady state operation of the load, the thyristor is also in an off state, thereby preventing current from flowing through the resistance R T. Once the sag detector detects the voltage sag , then the sag detector output directs the gate drive to open the relay As a result, the voltage at the input nodes is applied to the load through the resistor R S. The resistance R S is obviously higher than the near zero resistance presented by the closed relay By opening the relay , the resistor R S is added to the load The resistance R S is specified so as to limit the current that can flow to the load This resistance thus limits any current surge that might occur when the voltage returns to nominal and the voltage sag has ended, thereby minimizing or eliminating the possibility of damage to electrical components of the load such as diodes in the rectifier or other components.
It should be noted that the resistance R S may also reduce the voltage that is seen by the load during the voltage sag until either the thyristor is closed turned on or the relay is closed. In this respect, the resistance R S can exacerbate the reduced voltage experienced by the load during the voltage sag However, the reduced voltage due to the resistor R S will not be much worse than what can typically be experienced by the load without the resistance R S.
This is especially true if the voltage sag lasts for a short time. If the voltage sag lasts for relatively long time such that the operation of the load is disrupted, chances are any reduction in voltage due to the resistance R S would not be of any consequence. For maximum protection, the current flow through the resistor R S should be low, but as stated above, this might increase the possibility of momentary interference with the load operation.
Thus, the value of the resistance R S is determined based upon a trade off between protection in a multi-load environment and the possibility of nuisance interference with the operation of the load Experiments show that the resistance R S generally does not interfere with the load operation for voltage sags of short duration lasting less than five 5 cycles or so.
Once the relay is opened due to the detection of the voltage sag , then the current limiting circuit stays in such state until the sag detector detects that the voltage sag has ended. Assuming that the voltage sag has ended, then the sag detector output is appropriately altered. In response, the gate drive does not close the relay right away.
Rather, the relay is maintained in an open state.