For this rapid switching operation, they static transfer switches use semiconductor elements such as scrs i. The pdi static transfer switch supplies critical loads with a choice between two available sources of electrical power. This sts automatically transfers critical loads from a primary power source to an alternate power source in the. The ge static transfer switch supplies critical loads with a choice between two available sources of electrical power.
Provide input overcurrent protection in accordance with the unit ratings. Ul 1008 life expectancy transfer switch applications typically require a plant exerciser once a week or once a month. Beware of transformer and static transfer switch location in. Cyberex superswitch4 200a2000a digital static transfer switch. Before making any connections to the ss4, ensure that anyall power sources are deenergized and locked out. When specifying any ul 1008 transfer switch, you can be assured the switch has met and passed the following endurance testing. Careful evaluations are required regarding the numerous different pieces of equipment used power sources, ups systems, protective devices, electrical. Breakers and switches switches changeover and transfer switches. Static transfer switches power systems international. A static transfer switch uses power semiconductors such as siliconcontrolled rectifiers scrs to transfer a load between two sources.
The use of transfer switches and 2n architecture increases the maintainability of the switch panels and upstream equipment. They enable flexible site maintenance ensuring high availability. Static transfer systems sts are intelligent switches providing increased supply availability, automatically transferring loads to alternative power sources when the primary power source fails or is not available. Note to bypass the source 2 static transfer switch when source 1 is presently active, you must first transfer to source 2. The static transfer switch sts is an electrical device that allows instantaneous transfer of power sources to the load. If an alternate feeder exists or can be provided to the critical load at reasonable cost, sts can transfer quickly enough the voltage supply to an alternate source and sensitive load experiences only a shallow sag of short duration. The stsi is one in a family of l3 power paragons high speed digital static transfer switches series stsi. Based on this long experience the apotrans reliability is assured. Auxiliary contacts can be snapped on to the sides of the switches and the power terminals can be connected in parallel with bridging bars.
If the preferred source deviates outside of preset limits, the unit will instantaneously transfer to the secondary source. Power transfer switches static transfer switches ats sts. Preferred source mode selected preferred source supplies the load. The unit is designed to operate from solidly grounded ac power sources only. Application and installation, power quality assurance, vol. Modular and compact automatic transfer switch from 40 to 160a.
The static transfer switch is suitable for indoor use only. Static power is a privately owned australian company, based in melbourne where we design, manufacture, test and maintain our ists brand of static transfer switches. Liebert static transfer switch user manual pdf download. This sts automatically transfers critical loads from a primary power source to an alternate power source in the event of interruption or abnormal conditions. The backplane also provides the power output connections, alternate source input connections, and dry contact alarm connections. This transfer switch is suitable for use as service entrance equipment. Static transfer switch for it applications with no downtime during transfer from 16 to 1600a. Static transfer switch power paragon stsi product description the stsi is one in a family of l3 power paragons high speed digital static transfer switches series stsi. Static transfer switch sstn400ac400 the quality system has an iso9001.
Static transfer switches for source redundancy ge series sts 3 three phase. Russelectric automatic transfer switches are modern, highspeed switching devices designed to transfer electrical loads from a preferred power source to an alternate power source when voltage andor frequency varies from preset limits, and to retransfer loads when preferred source is restored. Static transfer switches are designed for operation in three modes. Enclosed automatic transfer switchin equipment with bypass from 125 to 3200a. The static transfer switch is a critical component within a data center or other critical environment. Because there are no mechanical moving parts, the transfer can be completed rapidly, perhaps within a quartercycle of the power frequency. A transfer switch is an electrical switch that switches a load between two sources. Understanding how a power continuity static switch operates. Static transfer switch sstn400ac63 rack control panel all products are equipped with led indicators and control panel. Power quality, static transfer switch, preferred source, alternate source, transfer time, detection time, sensitive load, control logic.
These systems can also be the achilles heel of the electrical distribution system if not operating properly and can represent a single point of failure in the system. Purpose the purpose of a static transfer switch sts is to keep power supplied to a downstream mission critical load by. Gold medal at the 74th poznan international fair for the static transfer switches series ss, ssn, sst, sstn. Ups module with st sw bypass ups with st sw bypass ups module with st sw bypass ups module with st sw bypass static transfer parallel switch. For maximum availability applications, liebert sts2 static transfer switch provides an automatic, seamless transfer between your critical load and the outputs of two independent ups systems in a dualbus power configuration. Twinsource rack mounted transfer switches united states. Allinone automatic transfer switch for all applications from 125 to 3200a. Static transfer switches 8 take an indepth look at the major components, parameters, installation locations, maintenance and testing a static transfer switch sts is critical to any redundant power system supplying data center loads. The sts controller module is a microprocessor based pcb that monitors the ac sources and controls the operation and automatic transfer of the sts. Layerzero static transfer switch products are power transfer switches designed to transfer power between multiple sources without interrupting the critical load. Eaton static transfer switch sts eaton type ii static transfer switch sts the eaton type ii sts transfers electrical loads from one source to another while eliminating the chance of a loss of power to critical equipment by properly coordinating with the electrical distribution system.
Check that the fuse of the motor operator at the bottom of the switch is ok, that the omd controller does not show any alarms and that the switch has a power supply. They perform instantaneous switching operations and thus supply immediate power to the load. One of the two sources can be designated as the preferred power supply, to which the static switch will transfer the load. This happens in such a way, that when one of the power supplying elements fail to supply power to the load, they promptly switch towards the backup power source, so that large or over sensitive loads do not have to face any.
The motorized changeover switches have snapon control wire connections. Some transfer switches are manual, in that an operator effects the transfer by throwing a switch, while others are automatic and trigger when they sense one of the sources has lost or gained power. For a comprehensive overview of publications available for the superswitch4 product line, refer to the. The installation of an automatic transfer switch or static transfer switch ensures 2n architecture is achievedand allows loads with single feeds to always be supplied by the highest quality of power. Designed using siliconcontrolled rectifier scr powerswitching elements, the stsi transfers the critical load between power sources in less than 14 cycle upon loss of source more than 10 times faster than. Wavestar static transfer switch power distribution, inc. If the primary ups should fail, the switch will automatically transfer the loads to the alternate ups. Liebert static transfer switch 2 installation, operation.
Uninterrupted transfer between sources is inhibited due to input source failure, sources out of sync, switch failure, or the unit is in bypass mode. Static power was started in 2002 with a team of dedicated, experienced engineers and professionals previously involved with the ups industry. Our solutions cover large power ranges and are suitable for. The uniblock is the most reliable high power ups in the world and has been built since 1982 using static switch technology. Use a transfer switch at the point of use to select a preferred source, and when that source fails switch to the second power path figure 1b use a large centralized transfer switch fed from the two sources, to generate a new power bus to supply a large group of single corded loads figure 1c ups 1 2 ups 1 a transfer switch is a. This superior switching time means that if one power source fails the sts switches to the backup power source so quickly that the load never recognizes the transfer made. Tfa static transfer switch power distribution, inc. Patented algorithm ensures instantaneous transfers without cross connection of sources. As such, reliability of these types of systems is critical and good. The automatic transfer switch does not change its position even if both networks are available. A toggle switch on the sts controller is used to set the primary source for the output power. Highperformance design industry leading full 5 year warranty, parts and labor. Also known as power transfer switches, the product transfers the connected load between two ac alternating current power sources a and b.
Static transfer switch pdi power distribution, inc. See manual transfer preferred source selection on page 66. Protect unit from excessive moisture and install in an area free from flammable liquids, gases, or corrosive substances. The eaton automatic transfer switch ats pdu enables you to remotely monitor alerts, provide redundant power and keep key missioncritical applications running. Total detect and transfer time for a failed source is typically 4ms. Apotrans at 100a to 1600a feature benefit very high reliability third generation static transfer switch by the quality leader in high power ups. Three phase static transfer switch with output pdu mdu bcms monitoring on sts unit sts unit display screen can portray. The static switch makes a rapid switch from one source to the other in the event of a fault to the power supply used to power the load, or carry out testmaintenance. Automatic power transfer switches automatic transfer switches ats and source or static transfer switches sts are a critical component within a power continuity plan.
The liebert algorithm is designed to optimize transfer timing such that the voltseconds applied to the downstream transformer primary is balanced, thus minimizing peak saturation current. Generally used to provide power redundancy to equipment with a single power supply, the eaton ats pdu automatically transfers power between sources with no interruption if the primary. Powering singlecorded equipment in a dual path environment. The transfer switch consists of a transfer mechanism, service disconnect circuit breaker, a relay control, fuses, and a terminal strip for connection of sensing wires. The sts controller determines the state of each source as good, bad, or failed and will automatically switch from a bad or failed source to a good source. The automatic transfer switches feature the automatic control unit, which can be adjusted according to the mounting depth of the panel. By continually monitoring power quality, the wavestar switch automatically transfers to an alternate source within a quarter cycle and without interruption of power to even your most sensitive critical loads.
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