About Us

Rotor Kraft Türkiye, with its knowledge on generator equipment maintenance and repair It provides fast and effective service to our customers in power plants and public utilities across the country.

Additionally, we are determined to serve the energy production sector without compromising on safety and quality.

Rotor Kraft Türkiye, offers the highest quality maintenance or repair service for your generator equipment by developing work packages specific to each project.

Mission

Our goal is to support and lead our customers in identifying their maintenance needs. We provide service excellence with a corporate touch by developing and implementing maintenance solutions that enhance the plants of our clientele.

Vision

We strive as a company to provide high quality and value-added complete repair and maintenance solutions.

Values

Integrity, Innovation, Reliability, Respect, Empowerment, Staff Diversity, Teamwork, Dedication, Commitment, Customer Satisfaction

History

Rotor Kraft GmbH Experience History Since 2008

2008

Business Start

2010

Starting to provide technical support for GE, Alstom and Siemens generators maintenance & repair projects

2017

Completion of the first full generator maintenance & repair project

2021

15 generator maintenance projects were completed in Canada, Algeria, Argentina, Colombia, El Salvador, Mexico and Peru

2022

Completion of the first generator maintenance & repair project in Türkiye

2023

Rotor Kraft Türkiye
has been officially registered

Tests and inspections
Re-wedging
Partial / complete rewinds
Removal of retaining rings
Installations
Lube Oil and lift oil Systems conditions check
Rotor Pull-in and Pull-out operations

Inspection of end windings
Radial hydrogen seal replacement
Specialty repairs
Project management
Commissioning and Start Up
High efficiency Technical Training to GS, Winders and O&M team’s
Tool rental and special design according to process

Complete and partial stator rewinds of steam and gas turbine generators with multiple cooling types including; air. hydrogen and liquid cold. Partial rewinds were performed on top and bottom bars/coils in some cases. This required insulation repairs with the bar still connected in the generator and sometimes out on the turbine deck.
End winding stability system repairs
Repairing, greasing or dusting loose blocking and ties. Thoroughly cleaning the area and applying weeping epoxy to resecure the blocks and ties
Removing ties and blocks when necessary and replacing
Due to poor wedge tightness analysis, partial and full re-wedges were performed on differing occasions. Depending on the percentage of hollow, loose and tight wedges. This can require re-engineering the outdated or obsolete wedge system to new and improved methods and materials
As a consequence of results from the EL-CID and/or core ring test, core iron repairs were required to reduce or eliminate hot spots.

Depending on the location of the hot spot determines the repair procedure for example light tooth top damage can be removed simply by etching the tooth top of the iron. More serious tooth top damage may require grinding of the iron. This is a crucial step and extra care must be taken to prevent further damage.
With the hot spot deeper in the tooth it may be necessary to loosen the core and attempt to insert mica in between the laminations of iron in a more extreme case. With the hot spot near the bottom of the slot or deeper the generator would need to be essentially unwound core loosened and sheets of mica inserted deeper into the laminations of iron
Safely utilized a Hytorc to check torque values on key bar nuts, building bolts and thru-bolts. When loose hardware is found, the torquing procedure is followed until OEM specification is met
When the stator core iron fails the core ring test or the integrity of the core iron is degraded far enough, it is recommended for a full stator core restack. Restacked the cores in accordance with OEM specifications a full stator restack is not always the correct recommendation and a partial restack can mitigate any future potential hazards

Stator Electrical Testing

Stator copper winding resistance utilized by DLRO (Digital low resistance ohmmeter)
RTD (Resistance temperature detector) resistance testing/grounding
IR (Insulation resistance) testing utilizing megger
PI (Polarization index) testing utilizing megger
DC Hi-pot (up to 80 kVDC)
DC leakage/step voltage (up to 80 kVDC)
Doble (10kVAC)
EL-CID (Electromagnetic core imperfection detector)
Core LOOP Test
Infrared camera inspection
Tube to Tube and tube to copper resistance test (Westinghouse single and double tube stack)
RSO testing (Repetitive surge oscilloscope) utilizing a generator shorted turn analyzer)
Knife test on core iron
Stator copper winding resistance utilized by DLRO (Digital low resistance ohmmeter)
Key bar tightening utilizing a hytorc
Building bolt tightening utilizing a hytorc
Thru-bolt tightening utilizing a hytorc
Belly band tightening utilizing a hytorc
End winding and stability system borescope and visual inspection of exciter end and turbine end windings
Borescope and visual inspection of the stator core
Wedge tightness tests (hand tap, ecotip or equivalent)
Bump test (nodal and reciprocity) stator windings that are in resonance will have high levels of vibration if not properly damped or braced windings in resonance can suffer from early conductor strand fatigue cracking, arcing and failure during operation.

Stator Mechanical Testing

Borescope and visual inspection of the stator core
Bump test (nodal and reciprocity) stator windings that are in resonance will have high levels of vibration if not properly damped or braced windings in resonance can suffer from early conductor strand fatigue cracking, arcing and failure during operation.
Coil Vent Tube Pressure Drop Test
End winding and stability system borescope and visual inspection of exciter end and turbine end windings
Main and neutral bushing air flow
Wedge tightness tests (hand tap, ecotip or equivalent)
Core tightening
Parallel ring assembly air flow

Example of Past Rotor Projects

Borescope and visual inspection of the stator core
Bump test (nodal and reciprocity) stator windings that are in resonance will have high levels of vibration if not properly damped or braced windings in resonance can suffer from early conductor strand fatigue cracking, arcing and failure during operation.
Coil Vent Tube Pressure Drop Test
End winding and stability system borescope and visual inspection of exciter end and turbine end windings
Main and neutral bushing air flow
Wedge tightness tests (hand tap, ecotip or equivalent)
Core tightening
Parallel ring assembly air flow

Rotor Electrical Testing

Rotor copper winding resistance utilized utilized by DLRO (Digital low resistance ohmmeter)
IR (Insulation resistance) testing utilizing megger
PI (Polarization index) testing utilizing megger
AC impedance testing
Pole drop test
Gauss meter test
Borescope and visual inspection of the rotor body and windings
RSO testing (Repetitive surge oscilloscope) utilizing a generator shorted turn analyzer)
Borescope and visual inspection of the rotor core

Reference Application’s

Blocking Modification and Pol to Pol connector replacement

Modification on the Phase Connection

Problem finding and eliminating insulation breach discovered and fixed

Our Repair & Maintenance Projects

Why Rotor Kraft Türkiye

Experience

15+ years combined specialist experience in the
Rotor Services division
Staff average 10+ years’ experience

Resources

Trained and experienced personnel provide high quality service
Efficient and certified operational processes

Credibility

Our Rotor Services division has completed over
25 projects since 2008
Loyal customers include General Electric

Value

Highly competitive rates
On-time and on-budget performance

Our Strengths

Loyalty

Team members are committed to the success
and future of the company

Efficiency

We generates services with the optimum amount of time and money needed to produce them

Reliability

We are accountable and consistently performing and delivering on what we promise

Commitment

We take all actions in the present that binds us to our future responsibilities

Phase modification
Stud replacement
Troubleshooting
Pol to pol replacement with partial rewind
Re-wedge
Repair

Robotic inspection
Consulting for stator rewinding

Consulting for retaining ring disassembling and assembling
GE OEM TIL2370 Retaining ring insulation - glass liner and insulation materials supply service
GE OEM TIL2067 Stator slot side filling migration application
ELDEC (Retaining ring removal special tool) rental

Rotor Kraft Enerji San. ve Tic. A.Ş.

Location

Ünalan Mahallesi Libadiye Caddesi Emaar Residence No: 82 E Blok Daire: 291 34700 Üsküdar İstanbul TÜRKİYE

Call Us

+90 216 606 6175

E-Mail

info@rotorkraft.com.tr

Explore Our Services