TAL-049-E - Leroy Somer | 1060 kW

Model. The TAL-049-E is a Leroy Somer TAL 4-pole alternator. TAL is Leroy Somer's high-power four-pole range. The three-digit group 049 is the frame and the trailing letter E is the core length — earlier letters are shorter stacks, later letters longer. The frame and core together determine the kVA ceiling for this machine. It is wound for three-phase service at 50 Hz. Electrical rating. At 0.8 power factor lagging this machine is rated 1060 kW, which is 1325 kVA, delivered as three-phase at 400 V 50 Hz. At 400 V line-to-line that is 1912.5 A per line. At this rating the machine is normally ordered with a PMG excitation system rather than plain shunt excitation, because the fault current available from a permanent magnet pilot exciter is what lets the downstream protection discriminate properly on a set this size. The 1500 rpm figure is synchronous speed, so there is no slip and no speed-dependent voltage droop. Frame and core. The 049 frame carries the E core. Frame size fixes the stator bore and the shaft centre height; the core length fixes how much active iron sits in that bore, and therefore how much output the machine can make at a given temperature rise. The exact finished weight and outline drawing depend on the winding and the coupling, so they are confirmed on the certified datasheet issued with the order. The cooling circuit is direct air cooled, IC01, and the frame is steel frame with cast iron end shields. Three-phase winding. This is a three-phase machine with a 12 re-connectable winding brought out to 12 re-connectable terminals, so it can be reconnected on site for the usual voltage pairs — 380/220 V, 400/230 V, 415/240 V, 440/254 V and 480/277 V on the 50 Hz build, and the 60 Hz pairs on the 60 Hz build. Reconnection is done on the link board inside the terminal box, not by rewinding, which is why one machine can serve a 380 V job and a 480 V job. The 2/3 pitch design is what keeps the fifth and seventh space harmonics down without skewing the stator, and it is the reason the line-to-line waveform stays within the distortion limits the standards ask for. Four-pole build. A four-pole machine turns at 1500 rpm on 50 Hz and 1800 rpm on 60 Hz. That is the standard choice for generator sets from a few tens of kVA up to the low megawatt range, because the lower rotor speed gives a longer bearing life, a quieter fan, a higher subtransient reactance that is easier to coordinate with downstream protection, and a rotor that can carry a substantial damper cage for parallel operation. The trade is weight: a four-pole machine of a given kVA is roughly twice the mass of a two-pole one. Excitation and voltage regulation. The excitation system is SHUNT standard; auxiliary "AREP" optional, regulated by R120 standard / R180 / R250 / R438 optional, holding steady-state voltage to +/-0.5%. Mechanical build. The frame is steel frame with cast iron end shields. Bearings are permanently lubricated ball bearings. Mounting is IM 1201 single bearing or IM 1001 two bearing, SAE flange. Maximum overspeed is 2250 rpm, and the machine is rated for 1000 m without derating. The rotor is dynamically balanced to ISO 1940 and IEC 60034-14. The single-bearing arrangement couples through a SAE flange and drive discs, so the alternator rotor is carried partly by the engine flywheel housing; the two-bearing arrangement carries its own shaft extension and takes a conventional coupling. Where it fits. Utility-scale standby and heavy process plant. At this rating the alternator is normally specified with a PMG and a digital AVR, and the specification usually calls out reactive capability, fault current, and parallel operation with the grid rather than just kW. On a three-phase machine of 1060 kW the practical constraint is usually the downstream protection and the cable, not the alternator itself. Core stack position. The E core is stack position 4 of 4 in the TAL family, roughly 100% of the way along the family's lamination length range. It is the longest stack the TAL family is built with. Long-stack builds carry the rating in the frame with the lowest flux density of the family. The extra iron costs length and weight, and buys a cooler-running core, lower magnetising current, better part-load efficiency and more margin for site ambient above 40 C or for a non-standard voltage. Where it sits in the range. The TAL family is catalogued from 11 kW up to 968 kW, and this page covers the 1060 kW / 1325 kVA point. The step below it is the TAL-049-D at 968 kW, 1210 kVA. It is the largest build in the family, so it is the one to quote when the load is fixed and there is no room for a second frame size. Reading the model code. A Leroy Somer designation is read as the LSA or TAL series, the frame size, and the core stack code (VS, S, M, L or VL plus a stack number). Here that gives TAL-049-E for the model, 049 for the frame, E for the core and three for the phase count, so the code on the nameplate and the code on this page match one for one. Quoting the full code rather than just the frame matters on this family, because the same frame number is built in several core lengths and the winding changes with the voltage. Frame position. The TAL range is built on 6 frame sizes — 40, 42, 44, 46, 47, 49 — and the 049 frame is number 6 of them. No other frame in this range carries exactly this rating, so the 049 is the only build at 1060 kW and there is no cross-frame decision to make. What the nameplate means once it is wired in. At 1060 kW and 1325 kVA this machine pushes 1912 A down each line on a 400 V three-phase supply. That current, not the kVA figure, is what the switchgear and the cable have to survive, so the outgoing breaker should be a 2500 A frame device set to trip above 2391 A, and the run from the alternator terminals to the first panel should be 630 mm2 copper per phase for a normal 25 to 30 m span. Longer runs, aluminium conductors or tray-installed cable all move that number up, and the volt drop at full load is what decides it in the end. On the mechanical side the prime mover has to deliver about 1187.2 kW at the coupling. The usual 1.10 to 1.15 margin over the alternator rating covers the fan, the excitation loss and the governor droop, and it is the reason a 1060 kW alternator is normally quoted against a 1187.2 kW engine rather than a 1060 kW one. Fuel burn follows the electrical load almost linearly in this range. At a realistic 0.29 L per kWh for a modern common-rail set, running this alternator at full rating takes roughly 307 L per hour; at 75 per cent load it drops to about 240 L per hour and at half load to about 169 L per hour, because the fixed losses stay put while the variable ones fall away. Quote the breaker frame, the cable size and the engine rating together with the alternator, because a set that is right on paper and undersized on the cable is the most common way a good alternator gets blamed for a bad installation. Where this rating sits in the frame ladder. Within the 049 frame TAL carries 4 distinct ratings, and this is number 4 of them at 1060 kW. This is the largest rating the 049 frame carries; the step below is the TAL-049-D at 968 kW / 1210 kVA, 92 kW under this one. Anything bigger moves to the next frame size up. Every step inside one frame is one more lamination stack length. The shaft, the bearings, the foot pattern, the terminal box and the AVR are the same part across the whole ladder, and only the core length and the winding change. That is why the price gap between two neighbouring steps is small while the gap between the last step of one frame and the first step of the next is large. It also sets the value-engineering rule: dropping one core size inside the frame saves money and axial length but eats the margin to the load, while stepping up one size costs far less than jumping to the next frame and buying a bigger skid, a bigger breaker and a bigger cable with it. Supply. Supplied as a genuine Leroy Somer unit — Nidec Industrial Solutions, built in France. LSA and TAL ranges are built in Europe and carry a European certificate of origin. Each alternator ships with the routine test certificate, the winding connection diagram, and the AVR commissioning sheet. Export packing is seaworthy plywood on a pallet sized to the frame, and the machine is strapped and shrink-wrapped inside it. Tell us the engine make and model, the coupling arrangement (single or two bearing), the voltage and frequency, and whether you need a PMG, and we will confirm the build before it leaves the works.