Turbogenerators. With Top Performance for Steam and Gas Applications. Specifically tailored 4-pole Synchronous Turbogenerators

Transcription

1 Turbogenerators With Top Performance for Steam and Gas Applications Specifically tailored 4-pole Synchronous Turbogenerators siemens.com / automation

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3 Top Performance Turbogenerators for Steam and Gas Applications Deriving from a longstanding tradition and extensive know-how as the world s leading manufacturer of electrical machines, Siemens has designed a new turbo generator specifically customized for the steam and gas turbine industry. 3

4 Leading Innovative Technology. The 4-pole generator incorporates innovative Siemens technologies such as MICALASTIC, optimized rotor dynamics, ventilation system simulation capability, and has a proven modular design that can be adjusted to fit existing foundations as well as gear boxes. The mechanical structure has a long operating life even under extreme operating conditions. Product description The brushless synchronous generator has a compact design with low overall dimensions and weight. Benefiting from Siemens extensive industry know-how, flexible engineering and 3D CAD systems, the generator is based on a modular design concept that shortens delivery times and enables reduced vibration output. The generator has a cylindrical rotor and welded housing. The short circuit current can be maintained for a sufficient amount of time until the short circuit protection is activated. Low lifecycle costs, long maintenance intervals, high reliability and long service life set Siemens apart from its competitors. 4

5 rpm / 50 Hz 1800 rpm / 60 Hz kva V V 6600 V V Basic parameters Voltage kv / 50 Hz; kv / 60 Hz Speed 1500, 1800 rpm Power factor 0.8 Degree of protection IP 23, IP 24W, IP 44R, IP 55, IP 56 Insulation/Utilization F / F; F / B Design type IMB3 (IM1001) Installation Indoor, outdoor AVR Digital Excitation Conventional with auxiliary winding Cooling method IC 01, IC 81W, IC 616, IC 31 Bearings Flanged sleeve bearings (forced lubrication) Axe height 900, 1060, 1180, 1340 mm Standards IEC, EN, DIN, VDE Optional parameters Design type IMB20 (IM1101) Classification ABS, DnV, LR, CCS, BV, GL, RMRS Standards NEMA, KTA 3702 Excitation PMG Ex-protection Ex na II acc. To IEC EN

6 Housing and Stator Core The stator core is built into a rugged welded housing. It is axially compressed and held together on the back of the core by clamping elements. The stator core consists of high-grade electric sheet steel laminations that are insulated from each other by a varnish coat. The three-phase winding and the auxiliary winding used to supply the excitation current (if PMG is not required) are accommodated in the slots in the stator core. Thanks to the excellent winding insulation (MICALASTIC ), the generators are also suitable for applications with extremely high humidity. Patented and Proven MICALASTIC Insulation System MICALASTIC is a proven mica-based Siemens insulation system for high-rating high voltage and low voltage generators and motors. The vacuum pressure impregnation (VPI) method is an important component that has been incorporated in the overall insulation design. This insulation system is characterized by its extraordinarily high mechanical strength, dielectric strength, and thermal endurance as well as durability against contamination, dirt, moisture and aggressive atmospheres which ensures a long winding lifetime even in the toughest conditions. 6

7 Rotor The rotor design is based on a laminated cylindrical rotor core pressed onto the forged shaft with a cylindrical shaft end for the coupling hub. The rotor winding is a flat-wire compact winding inserted into the rotor slots. The coils are secured by slot wedges in the active components and by bandages on the overhang elements. Copper damper bars are pressed into the core for smooth operation and resistance against load changes. In addition to the field and damper winding the rotor is equipped with a shaft driven fan, the exciter rotor and a rotating rectifier block. Damper Winding Each rotor is equipped with a generously dimensioned damper winding for smooth parallel operations and effective damping in the case of unbalanced loads. Damper copper bars and pressure plates on both sides of the rotor core are welded together to create a damper cage. This damper cage ensures that the generator has effective damping for transient oscillations that can occur during parallel operation with large load changes (load switch on / off). Bearings The generator rotor is secured by two sleeve bearings, allowing easy inspection and maintenance without having to dismantle the machine. Either radial bearings or single-thrust bearings are used depending on application requirements. Bearings are forced lubricated. One of the bearings is insulated to prevent a shaft current and to protect the bearing housings. 7

8 Air/air cooled generator IC616 with PMG. Cooler The turbogenerators can be delivered with IC01 cooling systems, which use the surrounding air from the local environment extended with ducts for remote cooling air or closed machines equipped with heat exchangers mounted on top. In the case of water cooling, the cooling elements are located on top of the machine. A redundant cooler element is optional. The air to air exchanger is also mounted on the top of the machine. The cooling air in the outer circuit is blown into the exchanger by electric fans. Excitation System The excitation system consists of auxiliary windings or a PMG, automatic voltage regulator (AVR), CTs and VTs for current and voltage sensing, a built-in exciter and rotating rectifier. Standard equipped turbogenerators include digital AVR, enabling power factor (PF) regulation and a large number of options for monitoring and protec tion (excitation limiters, overvoltage detection, possibility of redundancy etc.) The DC excitation current from the AVR is amplified by the rotating exciter and then rectified by the rotating rectifier. The rotating rectifier consists of diodes and surge protectors. Monitoring and Accessories The stator winding is monitored by temperature detectors embedded in the winding. Standard equipment for monitoring of bearings includes double temperature detectors and oil-flow meters for sleeve bearings. The air inlet is also monitored by a double sensor. The generator is equipped with an anticondensation heater to prevent surface moisture under certain climatic conditions. The heater is designed to keep the active elements of the machine warmer than the ambient temperature. The generator can optionally be equipped with CTs for metering or differential protection. Vibration sensors for bearings and shaft are also available. 8

9 The complete machine is mechanically checked and tuned if needed. 3D model of the complete rotor. Engineering & Design The engineering design is available in a 3D environment. The entire product can be visualized including the accuracy level and connections between motor parts, enabling continuous improvement and optimization. The rotating and static parts are FE modeled to assure stiffness. The excitation from surrounding elements is also included in the complete analysis. Special attention is given to reduce vibration and noise issues. The complete design is modular, assuring the synchronization of the main parts, reducing delivery times and the lead time for the complete product. Although the main parts make up the standard design, the interface connection and ventilation unit are customizable. Quality Turbogenerators, like all other products supplied by Siemens, conform to high quality standards. In addition to ISO 9001 certification, all materials comply with general standards (EN, IEC, ISO etc) as well as with Siemens standards which are even more stringent in many ways. 9

10 The biggest container ships in the world, 8 APM Maersk L , have one steam turbine driven generator on board ( MVA, 60 Hz, 1800 rpm, 6.6 kv, ABS classification) as part of the waste heat recover (WHR) system. Applications Turbogenerators are suitable for use in turbines with speeds of 1500 or 1800 rpm. The design can be adapted for steam or gas turbines, for open foundations or container solutions, for land or classified generators on ships or off-shore platforms including all relevant aspects of operation (environmental, declination for ship or offshore, etc.). The connection to the turbine, foundation as well as the cable connection and auxiliaries can be optimally adapted to match the setup of the complete system. 10

11 Final assembly of the steam turbine driven generator 15 MVA, 13.2 kv, 1500 rpm for steam turbine in Brazil. Service The Siemens service network is made up of an experienced team of professionals around the world who can provide customer support in over 100 countries. Offering an extensive range of services and support for Siemens customers throughout the product life cycle, the service team acts as your partner for the entire life of the generator. We offer comprehensive services ranging from technical support and preparing a generator design to providing after sales service and support. Service and maintenance contracts ensure the reliable functionality of your plant. We also offer spare parts, repairs and troubleshooting. Furthermore, we can give you the best technical advice on new projects such as expansions, retrofitting and general optimization and modernization projects. 11

12 Get more information / Siemens AG Industry Sector Drive Technologies and Industry Automation P.O. Box NUREMBERG GERMANY Subject to change without prior notice Order No.: E20001-A420-P500-X-7600 DISPO GD.LD.XX.LDSO WS Printed in Germany Siemens AG 2011 The information provided in this brochure contains merely general descriptions or characteristics of performance which in case of actual use do not always apply as described or which may change as a result of further development of the products. An obligation to provide the respective characteristics shall only exist if expressly agreed in the terms of contract. All product designations may be trademarks or product names of Siemens AG or supplier companies whose use by third parties for their own purposes could violate the rights of the owners.