{"id":5246,"date":"2020-01-28T11:51:38","date_gmt":"2020-01-28T11:51:38","guid":{"rendered":"https:\/\/blog.uk.tdk-lambda.com\/uk\/?p=5246"},"modified":"2020-01-28T11:51:39","modified_gmt":"2020-01-28T11:51:39","slug":"points-to-consider-when-selecting-a-power-supply-for-operation-on-a-three-phase-input","status":"publish","type":"post","link":"https:\/\/blog.uk.tdk-lambda.com\/uk\/2020\/01\/28\/points-to-consider-when-selecting-a-power-supply-for-operation-on-a-three-phase-input\/","title":{"rendered":"Points to consider when selecting a power supply for operation on a three phase input"},"content":{"rendered":"\n
Power supplies with a rated output of greater than 2,500W\noften require, or have an option for, a high voltage three phase AC input. A\nload of 3,000W, for example, operating from a single phase 230Vac input will\nconsume 13A (3000W \/ 230V = 13A). The same load operating from a 400Vac three\nphase input will draw just 4.3A (3000W \/ (400V x \u221a3) per phase.<\/p>\n\n\n\n
Using a three phase input avoids the use of large diameter conductors\nfor the AC wiring, a high current AC connector or even a hard wired (fixed)\nconnection to a distribution panel. It also mitigates current balancing issues\nfor a facility\u2019s three phase input, which will occur if large amounts of\ncurrent are drawn from a single phase.<\/p>\n\n\n\n
When selecting a power supply, it is very important to know\nwhere it will be operated and what input voltages are available. In Europe, the\nAC three phase voltage is a \u201charmonised\u201d 400Vac. Actually, the voltage in mainland\nEurope is 380Vac and 415Vac in the UK. In the US, however, the three phase\nvoltage can be 208Vac or 480Vac.<\/p>\n\n\n\n
In most countries power generation plants produce and\ntransmit high voltages in a three phase Delta configuration (see Figure 1) to multiple\nlocal substation transformers. Here it is reduced in voltage and supplied to the\nend customer. Note that a Delta configuration only uses three wires and has no\nneutral or ground wire. This saves the cost of extra wires, which are not\nneeded during transmission.<\/p>\n\n\n\n
Taking the UK as an example, the utility transformer close to a facility will receive 11kV in a Delta configuration from the National Grid. A step-down transformer converts the Delta configuration into a three phase, four wire Wye or star configuration (Figure 2), for connection to the facility\u2019s distribution panel shown in Figure 3.\u00a0 As explained earlier, 380V\/220Vac is mainly used in mainland Europe, 415\/240Vac in the UK.<\/p>\n\n\n\n
Figure 2: 380\/415Vac phase to phase Wye (star) configuration <\/figcaption><\/figure><\/div>\n\n\n\n
<\/p>\n\n\n\n
Figure 3: Available voltages in a typical European facility <\/figcaption><\/figure><\/div>\n\n\n\n
From the distribution panel, in addition to being able to\nsupply 380\/415Vac single and three phase (measuring across phase to phase),\n220\/240Vac is available by connecting to one of the Lines (L1, L2 or L3) and\nneutral N.<\/p>\n\n\n\n
380\/415Vac is used for mid-sized loads, typically greater\nthan 5kW. This could include large ovens, test equipment and burn in chambers, or\nmachines for metal fabrication, laser cutting and additive manufacturing. 220\/240Vac is used for loads less than 5kW\nand regular wall sockets.<\/p>\n\n\n\n
In the US, a facility will receive a 480Vac Delta\nthree-wire feed from the local substation (see Figure 4).<\/p>\n\n\n\n
Figure 4: Typical US facility power distribution <\/figcaption><\/figure><\/div>\n\n\n\n
Step-down Delta-Wye transformers are used to provide power\nto loads less than 25kW. This provides 208Vac single and three phase and single\nphase 120Vac (Figure 5). Unlike Europe, equipment requiring large amounts of\npower will utilise three phase 480Vac Delta directly, without being stepped\ndown by a transformer, reducing cost, energy and space on the factory floor.<\/p>\n\n\n\n
Figure 5: 208Vac phase to phase Wye configuration <\/figcaption><\/figure><\/div>\n\n\n\n
TDK-Lambda\u2019s GENESYS+™ series of AC-DC 1,500W to 15kW programmable\npower supplies offers a wide selection of input voltage ranges, depending on\nthe output power level. <\/p>\n\n\n\n
<\/figure><\/div>\n\n\n\n
On the higher power GENESYS+™, if only European operation is\nrequired, then a three phase 342 to 460Vac input would be selected for a 400V\nnominal input. If exporting to the US is also desired for the power system, then\nthe extended 342 to 528Vac input range should be chosen. The three phase input\nfor the GENESYS+™ is suitable for both a three wire Delta and Wye connection,\nplus ground.<\/p>\n\n\n\n
Alternatively, if a system is being built just for\nUS use, then it must be determined in advance if 208 or 480Vac three phase will\nbe needed.<\/p>\n\n\n\n
The 4,000W rated TPS4000 series of industrial power\nsupplies also accepts a 350 to 528Vac, Delta or Wye 3 phase input and can be\nused internationally too.<\/p>\n\n\n\n
If global use is important, it is advisable to check if a\npower supply will operate from both a high voltage Delta and Wye connection. Lower\ncost products may only operate with a 230Vac Delta connection or a 400Vac Wye\nsource. This may force the end customer to require the installation of a large,\nexpensive step-down transformer.<\/p>\n","protected":false},"excerpt":{"rendered":"
Power supplies with a rated output of greater than 2,500W often require, or have an option for, a high voltage three phase AC input. A load of 3,000W, for example, operating from a single phase 230Vac input will consume 13A (3000W \/ 230V = 13A). The same load operating from a 400Vac three phase input […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3,81,22],"tags":[],"class_list":["post-5246","post","type-post","status-publish","format-standard","hentry","category-application-solutions","category-genesysplus","category-products"],"acf":[],"yoast_head":"\n
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<\/figure><\/div>\n\n\n\n