DIG110/DIG120/DIG130 — medium- and high-voltage synchronous generator 3.3–13.8 kV, up to 4000 kVA

Description

DIG110, DIG120 and DIG130 are the smaller frame sizes of the DIG series: medium- and high-voltage synchronous generators with a salient-pole rotor and bar stator winding, produced in Craiova (Romania). DIG120 covers the range 880–2600 kVA (maximum 2050 kVA at 50 Hz and 2600 kVA at 60 Hz) at voltages of 3.3–11 kV, four poles. DIG130 develops up to 3850 kVA at 50 Hz and 4000 kVA at 60 Hz (range 1140–4000 kVA) at voltages of 3.3–13.8 kV, in four-, six- and eight-pole versions. The DIG110 frame size (560–1300 kVA, 3.3–11 kV) has been discontinued, but it is supported with spare parts and service. According to the brochure, the rated powers are given for 3.3, 6.3, 6.6, 10.5 and 11 kV at 50 Hz and for 4.16, 6.6 and 13.8 kV at 60 Hz. DIG generators have brushless excitation with the regulator powered from an auxiliary stator winding (permanent-magnet pilot exciter is optional), which ensures a steady-state short-circuit current of more than 3 times the rated value; the regulator withstands short-circuit conditions for up to 10 s, after which over-excitation protection de-excites the machine. The digital regulators DECS100, DECS150, DECS250, DM110 and UNITROL 1010/1020 provide accuracy of ±0.5 % in island mode, reactive load sharing, and parallel operation with the grid with power factor regulation. Stator with formed coils and a 5/6 pitch, salient-pole rotor with damper winding; class F insulation with VPI. Standard protection IP23, options include filters and IP44/54/55; cooling IC01, air–air IC611/IC616 (CACA) and air–water IC81W (CACW); rolling or split sleeve bearings. Example of rating data: DIG130 h/4 at 11 kV, 50 Hz, 1500 rpm — 2100 kVA at power factor 0.8 (1680 kW), current 110.2 A, class F, IP23, cooling IC01, mass 6300 kg, moment of inertia 85 kg·m², regulator DECS 100; efficiency according to IEC is 96–97 % over the 50–100 % load range, short-circuit ratio 0.48, xd″ = 0.189 p.u. The generator complies with IEC 60034, zone A according to IEC 60034-1 (voltage deviation ±5 %, frequency ±2 %). DIG generators are designed to be coupled with diesel and gas engines and with steam and gas turbines of all major manufacturers. Applications: primary power stations, the oil and gas industry, mining enterprises, marine power stations and propulsion installations, data centres. The generators meet the requirements of the main marine classification societies.

Technical specifications