The focus of the document is on electromechanical switchgear, however electronic devices used in low voltage. Pdf ch 16 introduction to switchgear andebo hillary. In an electric power system, switchgear is composed of electrical disconnect switches, fuses or. The locked rotor current lrc of a motor depends on the motor design, and is typically between five and ten times motor full load current flc. Circuit breaker ratings up to 4000a can be accommodated and have been tested within type. Medium voltage technical guide electrical engineering portal. Source is from a rutgers 4160 volt 3 phase radial or loop underground system supplied from a 26,400 to 4160 volt grounded system. For standard design, specify pad mount transformers for outdoor use, 3 phase, oil filled, with a 55. Design and installation of medium voltage switchgear facts. Design guide for rural substations usda rural development. It performs these functions so that sensitive loads are assured of suitable voltage quality at all times. Space heaters are used to raise the temperature in the enclosure by supplementing the heating naturally present in energized equipment. The focus of the document is on electromechanical switchgear, however electronic devices used in low voltage engineering have also been included. The inter rupting rating is 75,000 kva in the 4160 volt range, and 50,000 kva at 2300 volts.
Powell vacuum circuit breakers have a proven history of stable design for high reliability and ease of maintenance. Manufactured medium voltage mv switchgear panels are rated according to a number of specifications. Vista switchgear s sealed tank design protects the equipment from contaminants, wildlife, and weather elements, allowing it to require virtually no maintenance. Medium voltage power distribution and control systems switchgear. Rozdzielnice mns is rozdzielnice niskiego napiecia mns abb. Powerzone 4 arc resistant low voltage switchgear with arcblok technology metalclad switchgear description page low voltage switchgear.
Standard bil ratings of 60 kv are available for 5 kv applications, and 95 kv bil for 15 kv applications. Part iii division 26 page 4 rutgers design standards manual june 2018 gas co. This bus work conveys the power to the different medium voltage switchgears located in the plant. Olta switchgear buil last 1 dw2, primary switchgear, air insulated and metal clad. However, the use of high voltage greater than v to. In addition, the system ist also capable of eliminating the perturbation produced by irregular loads. In addition to the high voltage airinsulated or gasinsulated installation possibilities, also a. Complicated distribution substations can be found in the downtown areas of large cities, with high voltage switching, and switching and backup systems on the low voltage side. Mediumvoltage power distribution and control systems motor control. Designing mediumvoltage genset systems specifying engineer. The drive costs more, and you need more infrastructure to house and protect the drive. Basic substation configurations and the components avo training. The infrastructure of the switchgear is also established.
The difference between the ground potential rise and the surface. In addition to the high voltage airinsulated or gasinsulated installation possibilities, also a socalled hybrid solution is available. Power frequency withstand voltage ac 50 hz, 1 min across isolaing distance 160 kv 265 kv 315 kv rated lightning impulse withstand voltage 1. In this plant design there are two sets of switchgear buses rated at 6. Designing mediumvoltage electrical systems consulting.
The use of sipcon can enable energy suppliers worldwide to provide the. Medium voltage products technical guide the mvlv transformer. On design aspects our present thrust is more on lv switchgear and control gear assemblies being used the most. Written by a team of leading experts in the field, the third edition features new sections on lightning protection for buildings, electrical equipment, and distribution systems.
Typical rvss motor starter with mpr for 400 900 hp at 4160 volts 3 dia 60hz schematic diagram ii. The switchgear s simple, singlehandle operation and visible gaps allow performance of routine operations without confusion and with less worker exposure to medium voltage. Install voltage markers on all conduits containing medium voltage cables. Front or rear accessible design fixmounted isolation switch and starter fvnr, fvr, fvc, rvat, and ssrv configurations available 2300, 4160, 7200 voltage ratings powered by safety mvmccar nema e2 motor control center overview continuing our position of leadership in advancing arc resistant technology, powell offers. Handbook to ieee standard 45 a guide to electrical installations on. Nov 14, 2014 for detailed design information on grounding and protection, consult the ieee color book series. Philosophy of protection, nature, causes and consequences of faults, zone of. Customerend user guide to creating mvlv electrical substations.
Magnum ds switchgear is an assembled metal enclosure that houses drawout power circuit breakers and typically includes control and metering devices. Fundamentals of electrical substations and switchgear. Mv switchgear types are classified according to function and method of insulation. You can turn to the new edition of classic handbook for the latest information on switchgear design, application, safety, and maintenance. For the use of this standard, high voltage see iev 6010127 is the rated voltage above v.
On design aspects our present thrust is more on lv switchgear. Outdoor service disconnect service equipment installed outdoors may be of weatherproof metal clad or metal enclosed switchgear or of pole type construction. This equipment shall have drip proof indoor enclosures 7. Philosophy of protection, nature, causes and consequences of faults, zone of protection, requirements of a protective scheme, basic terminology components of protection scheme. Book, ieee std 1411993, recommended practice for electric power. The high voltage side 110 kv is an outdoortype airinsulated switchyard and the medium voltage side 20 kv is metalenclosed airinsulated switchgear located inside the building. High voltage switchgear was invented at the end of the 19th century for operating motors and. However, the term medium voltage see iev 6010128 is commonly used for distribution systems with voltages. All medium voltage systems require medium voltage metalclad switchgear to tie everything together. Secondary voltages are configured for seriesparallel operation at 120 v or 240 v. Medium voltage solid state starters 300 6,000 hp 2,300.
Each starter is supplied with a load break isolation switch, class r motor. The application of 4160 v to longwall face equipment. The breaker is designed to operate on ac circuits of 2300 to 4160 volts nominal, and 4760 volts maximum. Design control and protection for medium voltage switchgear. This bulletin provides a basic design guide and a reference tool for designing rural substations. The induced eddy current heating in the steel panels of the switchgear caused by the current flow and the resistive heating resulting from the impedance.
In this way, switchgear protects the system from the damage and ensures continuity of supply. True, it costs less to install a medium voltage drive, but that cost is a fraction of the overall cost differences between the two options. Medium voltage drives cost more than low voltage drives. Condensation in switchgear and anticondensation heaters. The currents are lower, shortcircuit protection is often ensured by the assigned circuit breaker at the primary distribution level. Type wl lowvoltage switchgear substation secondaries. Vaccladw 515kv, metalclad mediumvoltage switchgear design. The cptik is used in an ambient temperature of 30c for full. This manual provides engineering data and criteria for designing electric power plants where the size and characteristics of the electric. A typical medium voltage metalclad switchgear lineup will use medium voltage vacuum breakers along with the associated protective relaying see. The medium voltage, or power pole section, is located in the main body of the enclosure, whereas the low voltage section containing the control logic is located behind the door as an isolated compartment. Elementary principles of arc interruption, recovery.
Section 26 , mediumvoltage circuit breaker switchgear. Sep 05, 2019 photo source from switching in electrical transmission and distribution systems book figure 6. Design detail standards las vegas valley water district. Understand the function of a medium voltage circuit breaker in a power plant. Typical rvss motor starter with mpr for 400 900 hp at 4160 volts 3 dia 60hz schematic diagram ii pdf. The present technical manual is intended as an aid in project design and the application of low voltage switchgear and controlgear in switchgear assemblies and machine control. Standard two or four compartment designs meet the many. With airinsulated switchgear from siemens you are always on the safe side our switchgear is typetested for indoor installat. The scope of 4160 volt upgrade project is to make significant improvements to the 4160 volt power distribution system at the knolls laboratory by replacing antiquated 60 year old switchgear and cabling located in the z4 high yard with new stateoftheart equipment.
This design was completed with the end user in mind. Typical single line diagram and elevation for 480 volt switchgear and motor control center pdf download dwg. The uats secondary windings are connected to the nonsegregated phase bus duct or nonseg bus. Seismic qualification for metal enclosed and solidinsulation enclosed switchgear and controlgear assemblies for rated voltages above 1 kv and up to and including 52 kv cei 994. Practical power distribution for industry sciencedirect. The purpose of this thesis work has been to design a c ontrol panel for our switchgear, plan protection relays and plan the hardwire plc system for a new switchgear. In this chapter, we shall present the elementary introduction to switchgear. Different design combinations provide unlimited applications and maximum service reliability. Switchgear and protective devices 2015 3 p a g e syllabus switchgear and protective devices 310 modulei 10 hours protective devices. If the project is located in areas outside of central campus, design using a primary voltage of,800 volts. May have various voltage levels before it reaches the customer.
The conditions of the contract and applicable requirements of divisions 0 and 1 and section 26 00 01, electrical general provisions, govern this section. Iem outdoor metal clad medium voltage switchgear 5kv 163466 e. Maximum design flexibility and elimination of epoxy cracking. This corresponds to 10,400 amperes interrupting rating at 4160 volts, and 12,500 amperes at 2300 volts. Also, the mine safety and health administration msha has developed approval criteria for high voltage equipment to supplement existing regulations. Electric power manual bus transfer switchmbt switch. Abb padmount switchgear overview abbs flexible padmounted switchgear is available in over 40 models, with a variety of switch and fuse arrangements to satisfy most customer requirements. This design becomes impractical when dealing with higher voltages. Typical single line diagram and elevation for 480 volt switchgear and motor control center 041907 e146. This depends on the reliability, fault level, and the flexibility required. Full voltage starting also referred to as direct online or acrosstheline starting results in a high starting current, equal to locked rotor current.
Smaller transportation size and consequently easier shipping. Consulting specifying engineer designing mediumvoltage. Low voltage switchgear powerzone 4 low voltage switchgear with masterpact circuit breakers 116 micrologic trip units 116 medium voltage switchgear minibreak compact height switches 5. Design and installation of medium voltage switchgear facts you. Switchgear switchgear de12 de123 low voltage metalenclosed drawout class 6037 refer to catalogue 6037ct9901 powerzone 4 arc resistant switchgear with arcblok. Metalclad vacuum breaker switchgear vaccladwmediumvoltage. Eaton s medium voltage switchgear provides centralized control and protection of medium voltage power equipment and circuits in industrial, commercial, and utility installations involving generators, motors, feeder circuits, and transmission and distribution lines. Section 16346 outdoor metal clad medium voltage swtichgear.
Jul 04, 20 breaker and switchgear development that has set industry standards for quality, reliability, maintainability and extended operating life. By using transformers to reduce large currents and high voltages to lower ranges usually 05 amps and 120 volts, very simple motors or electronic circuits can be used to externally control circuit breakers. Low voltage switchgear is applied at 600 v and less. Allows the breaker to be removed using a motoroperated or handcranked. Gasinsulated switchgear should be used for the medium voltage consumer substation. Description mva standard narrow design mva arc resistant voltage 5, 15, 27, 38 kv 5 kv 5, 15, 27, 38 kv operation duty cycle high high high. Metalclad vacuum breaker switchgear vaccladwmedium voltage.
1325 1794 1550 231 1341 944 1505 64 1790 122 792 1685 916 131 1188 1688 154 289 1306 731 237