PARTIAL DISCHARGE ANALYSIS

Document Sample
PARTIAL DISCHARGE ANALYSIS Powered By Docstoc
					                                      P A R T I A L               D I S C H A R G E                                   A N A L Y S I S
                                                                                                                                           PDA

                                                      A Powerful Diagnostic Technique That Can          obtained leading to failure of the equipment.

                                                      Be Conducted On- or Off-line for
                                                      Condition-based Maintenance and Outage
                                                      Avoidance                                         Your GE Solution
                                                      Partial Discharge Analysis (PDA) is a non-        GE provides a wide variety of installation and test-
                                                      destructive and non-invasive technique for        ing options for Partial Discharge measurements.
                                                      monitoring the integrity of the stator insula-    Using phase-resolved data acquisition, insulation
                                                      tion systems in rotating machines. PDA test-      experts can remotely monitor equipment and tailor
                                                      ing during machine operation is useful for        a testing plan to meet the customer’s needs.
                                                      identifying potentially catastrophic deteriora-
Phase-Resolved PD Analysis Plot
                                                      tion phenomena such as slot discharge,
This plot shows phase-to-phase discharge
activity caused by end-arm contamination.             internal voids, delaminations as well as

                                                      winding looseness.


                                             What is Partial Discharge?

                                             Partial discharges are electrical “sparks” that do not

   What Causes PD?                           completely bridge the electrodes and which exist in
   • Insulation delamination/damage          nearly all high voltage electrical machinery. The phe-
   • End winding contamination
                                             nomena results in high frequency, low voltage signals
   • Damage to end winding voltage
     suppresser system                       on the phase leads. Over time, the degradation and
   • Stator bar vibration                    discharges become larger until a full discharge is
   • Broken conductor strands




                                             g
                                                                                                        GE Energy Services
                                                                                                        gepower.com
                                              P A R T I A L              D I S C H A R G E                        A N A LY S I S
                                                                                                                                  PDA

                                                                                       GE Solutions: Tailored to Meet Your Needs
                                                Couplers meet all applicable
                                                                                       • Installation kits, including PDA sensors and
                                                electrical standards and
    Phase 2




                                                safely allow GE to regularly             termination boxes for your motors and generators
              Ph
                as
                                                monitor the condition of your
        1          e
    e                  3                        installation system.                   • Supervision of installation
  as
Ph

                                                                                       • On-line local or remote data acquisition and

                                                                                         analysis
PDA
Sensor                                                                                 • Continuous On-line Monitor (PDA-COMpact)
                              Data
                           Acquisition
                                                                                       • Data analysis services compatible with other
                             System
                                                                                         manufacturers’ equipment

                                                                                       • Customer training




                             The GE Approach
                                Feature                                  Your GE Advantage
                                GE’s sensors allows us to monitor        Superior to slot-style couplers (e.g., SCC’s) which provide
                                the entire machine winding.              limited coverage to the top bar (or two) per phase.


                                Installation can be done in less than    Far less expensive than competitor methods which may
                                one day during a minor outage.           require removal of the field to install the sensors.


                                GE uses phase-resolved PDA with          We go beyond simple trending of measured and integrated
                                sophisticated pattern analysis.          quantities (e.g., NQN) to more accurately identify defects.




                             For more information, contact your local GE representative.




                              g
                                                                                   GE Energy Services
                              A GE Power Systems Business
                              4200 Wildwood Parkway
                              Atlanta, GA 30339
                              1-800-4GE-FAST


                              GEA 12307B 5M 07/01