PARTIAL DISCHARGE MEASUREMENT
|
|
- Ronald Hodge
- 5 years ago
- Views:
Transcription
1 PARTIAL DISCHARGE MEASUREMENT Partial Discharges are small electrical sparks which occur predominantly at insulation imperfection. It is the phenomenon which occurs in the insulation on application of high voltage. PD is defined as localized electrical discharges in insulating materials, restricted to only part of dielectric under test. It takes place in cavities and voids inside the insulation.
2 Partial Discharges: Metallic conductor Partial bridging of the Insulation between the conductors Localized electrical discharges restricted to a part of the dielectric void dielectric
3 Types of Partial discharges Internal discharges Surface discharges Corona discharges Internal discharges lead to deterioration of insulation and treeing treeing 3
4 1. ACOUSTIC EMISSION TECHNIQUE A.E. sensing is a non-destructive test method, offers good, real time solution to both -PD detection and PD source location. Because it is not affected by strong electric fields, it is well suited to inspection of on-line transformer. Frequency content of these mechanical pulses are generally located in freq band of 100 to 200 KHZ. Acoustic signals (generated by PD) to be detected by multiple channels which provide enough information for location of discharge source.
5 Partial Discharges: Associated with degradation of insulation system. Pulse-like in nature and cause high frequency (ultrasonic) pressure pulses to propagate through insulation media. Always produce/cause mechanical stress waves (acoustic waves/emission) which propagate through surrounding oil and can be detected at transformer tank wall. Similar in character to stress waves propagated in solids during crack formation.
6 Block Diagram of AE System Sensors: Piezo-electric transducers. Converts the mechanical signal emanating from PD source into elect. Signal. Sensors are mounted using a silicone vacuum grease as coupling agent between sensor and Transformer tank wall. A constant force, magnetic hold down is used to press sensors against transformer wall. Pre-amplifier: It is necessary not only to amplify the signal but also to lower its impedance. Filter: The signal can then be filtered to exclude erroneous data before further manipulation takes place. Band pass filter of 100 KHZ to 300 KHZ. Superheterodyne Circuit : Part of the signal is fed to Super heterodyne ckt which drops its freq. into audible range i.e. 20 HZ to 20 KHZ. This enables one to literally listen to Partial Discharges. The remainder of the signal is then further amplified in an adjustable amplifier. Threshold: It passes the signal which has amplitude above the threshold value & cuts all the signals below the threshold value. Counter: The number of pulses exceeding this value is totaled in the COUNTER module. This counter is reset at predetermined intervals so that the output to the strip chart recorder is actually pulse rate.
7 Case Study (1) 200 KVA Distribution Transformer was monitored. AE signal with PCR (Pulse Count Rate) up to 30,000 per second were detected. Source of signals appeared to be in the general area of TAP CHANGER. Tap Changer was dismantled and it was found that arcing had occurred between rollers and contacts causing minor damage. Following repair and reassembly, no further signals were detected.
8 Case Study (2) 333 KVA Transformer monitored This emitted pulses at the rate of 2000 per second. Monitoring this for several months showed an increasing level of activity until PCR (Pulse Count Rate) rose to 10,000 pulses/second. At that time, Gas and Oil Samples were taken and transformer was taken out of service for more detailed examination.
9
10 The large surplus of carbon dioxide (4 times ambient air) and the reduction of oxygen (0.77 times ambient) together with a trace of hydrogen suggests that Cellulose degradation products were present. The lack of any hydrocarbons suggests that the oil is in good condition despite its age (18 years). It is concluded that PDs had been taking place in the Transformer and were associated with Cellulose materials.
11 Strategies 1. Amplitude (db) vs Time (sec.) 2. Count vs Time (sec) 3. Energy vs Time (sec) 4. Asl (accumulated signal level) vs Time (sec)
12 Fig Phase Generator Transformer 160 MVA, 11.5 / 230 KV TOP VIEW OF TRANSFORMER UNDER TEST. Fig. 1 VIEW OF SENSOR POSITION ON DIFFERENT SIDES OF TRANSFORMER
13 Fig. 3
14 Location 13
15 Location K
16 LOCATION L
17 Location M
18
19 BETN SIDES A & C ( TOP CORNER OF X MER NEAR TAP CHANGER SIDE)
20 DISCHARGE PATTERN in Electrical method off line: The Display Of Partial Discharges Can Be Observed On An Oscilloscope, Preferably In The Form Of An Elliptical Display Representing A Sine Wave.
21 EVALUATION/INTERPRETATION ELECTRODE HV CAVITY DIELECTRIC _ a) Internal discharges in a dielectric bounded cavity i) Discharges occur between Zero transition & peak on both half cycles. ii) Discharges are of same amplitude & number on both sides of ellipse. iii) No variation in magnitude with rise in voltage. iv) Time of voltage application has no effect on discharge pattern. v) Inception voltage is well defined and Ve is slightly below or equal to Vi.
22 EVALUATION/INTERPRETATION ELECTRODE HV CAVITY ELECTRODE DIELECTRIC - b) Internal discharges in a cavity in the insulator at electrodes. Discharges occur before the voltage peak on both half cycles. Large discharges on one half cycle. If small number of larger pulses are observed in the ve peak and a large number of small discharges at +ve peak, the discharges are on the ground side and if pattern is reversed, discharges are on the hv side. No variation in magnitude with rise in voltage. Time of voltage application has no effect on discharge pattern.
23 EVALUATION / INTERPRETATION ELECTRODE HV FISSURE + 0 DIELECTRIC _ c) Internal discharges fissures in elastomeric insulation in direction of field. Discharges occur ahead of voltage peaks on both half cycles. Discharges are of similar in amplitude and number on both half cycle. No variation in magnitude with rise in voltage. Time of voltage application effects the discharge pattern. If the maximum voltage is kept for longer time, the discharge level decreases.
24 EVALUATION/INTERPRETATION HV ELECTRODE DISCHARGES + 0 DIELECTRIC DIELECTRIC ELECTRODES Internal discharges in a number of cavities of different shapes & sizes within a dielectric. (fig.1) and discharges on an external dielectric surfaces at areas of high tangential stress.(fig. 2) and discharges on an external dielectric surfaces between two touching conductors (fig. 3) Discharges occurs ahead of voltage peaks on both half cycles. Discharges are of same amplitude and numbers on both sides of ellipse. The no of pulses increase and become unresolved with rise in voltage. Time of voltage application has no effect on discharge pattern. Ve is slightly below or equal to Vi. -
25 EVALUATION/INTERPRETATION ELECTRODE HV LAMINAR CAVITY + 0 DIELECTRIC e) Discharge in the laminar cavity. Discharges occur before the voltage peak on both half cycles. Discharges are of the same amplitude and number on both side of ellipse. The no. of pulses increases and becomes unresolved with rise in voltage. Time of voltage application effects the discharge pattern. If max. voltage is kept for longer time, the discharge level decreases. Ve < Vi - 180
26 EVALUATION/INTERPRETATION ELECTRODE HV CAVITY + CARBON TRACKS DIELECTRIC - f) Discharges in a cavity which degenerates into a track. Discharges are of the same amplitude on both half cycles. The no of pulses increases and becomes unresolved with rise in voltage. Magnitude remains the same with rise in voltage. Time of voltage application has no effect on discharge pattern.
27 ON-LINE PARTIALDISCHARGE MEASUREMENT Partial discharges occur years before failure. Sufficient time to corrective maintenance to avoid In-service failure of the generator or motor. Disadvantages of Off-line Partial Discharge Measurement OR Advantages of On-line Partial Discharge Measurement Although P.D. testing has normally been done with the machine out of service (Off Line) to minimize test cost & inconvenience, plants prefer an ON-LINE. Stator winding problems such as slot discharge are not so apparent during Off-Line PD tests.
28 The typical 5 years interval between Off-Line tests (i.e. PD tests done during a suitable outage ) is too long a period compared to the time it takes for some problems to originate & lead to failure. ON-LINE PD testing makes it practical to test the motor or generator more frequently. So, Power Utilities and Chemical companies emphasize ON-LINE PD testing, as opposed to tests performed during outage. Find loose, overheated, and contaminated windings in stators of motors and generators well before these problems lead to failure. Assess the need for motor and generator maintenance in stator windings.
29 Able to determine manufacturing or installation problems, such as poor impregnation with epoxy. Provides an effective way of avoiding interruptions and failures due to slowly progressing electrical deterioration of insulation. Help maintenance engineers identify which stator windings need off-line testing, inspections, and/or repair. The main difficulty in performing ON-LINE PD test is not in detecting PD signals, but rather in distinguishing the PD from electrical noise.
30 CHALLENGES FOR ON LINE PD MEASUREMENT Different kinds of SENSORS Methods for noise suppression
31 SENSORS FOR ON LINE PD MEASUREMENT : High voltage capacitive sensor 2. Stator Slot Coupler ( SSC )
32 High voltage capacitive sensor A bridge like pair of capacitive sensors are permanently mounted on each phase of hydro generator ( or motor). That is key for inherent elimination of noise. Two PD sensors or bus couples are installed per phase, i.e. six per machine (see fig.1). High voltage capacitors connected to the phase terminals are used to detect the PD pulses. Capacitor sizes ranged from 80 to > 1000 pf.
33 In comparing the time of arrival of pulses at the two couplers in a phase, if a pulse is first detected at couplers nearest to the stator winding (N in Fig.1), then the pulse is likely to be caused by stator PD, and should be counted. However if a pulse is first detected at the coupler closest to the power system, i.e. at the coupler furthest from the stator (F in Fig.1), then the pulse is due to noise and should be ignored.
34 On- line Partial Discharge tests for Turbine Generators using Stator Slot Coupler ( SSC) An on- line Partial Discharge test using bus couplers was found to be unreliable for high speed turbine generators rated 100 MVA or more. In all large turbine generators there are significant sources of internal noise from brush sparking, poor contacts, and core lamination arcing, and the test results could not be correlated with known turbine generator winding condition. This realization lead to the development of a new type of PD sensor called the Stator Slot Coupler ( SSC ).
35 Unlike PD sensors using high voltage capacitors, the SSC is not electrically connected to the winding.
36 The SSC is a low voltage antenna which detects the electromagnetic energy from PD and other signals. The SSC is installed in stator winding slots. SSC is installed underneath the wedges. Each SSC is about 50cm long, 1.7mm thick, and is custom made to be the same width as the stator slot. The substrate of the SSC is an epoxy-glass laminate (NEMA G0 or G11).
37 The characteristics of PD and noise detected by an SSC are completely different, permitting reliable discrimination between PD and noise. PD pulses within the stator winding results in voltage pulses which last only 1 to 5 ns (see Fig. 5 (a) ). However all pulses not due to stator PD have a pulse width in excess of 20 ns (see Fig 5 (b) )
38 This clear difference in pulse shape permits distinguishing between all noise (external and internal) and stator PD. The SSC has a relatively flat frequency response in the range 30 MHz to greater than 1GHz. Therefore the SSC can detect the true pulse shape of any high- frequency signal propagating along the stator slot.
39 Since the SSC is made of the same materials used for conventional wedges and slot packing, the SSC can operate to the same class F (155 C) temperature rating of epoxy windings. Typically six slots in a stator are equipped with SSC s. The main advantage of the SSC is its ability to produce different responses to all types of electrical interference, both from within and without the machine.
40 SSC test can identify large turbine generators with good and deteriorated windings. A deteriorated winding has a partial discharge activity which is about 30 times higher than a generator of the same make and vintage which in good condition. FINALLY Sensors have been developed which inherently reduce the influence of noise. Experience shows that there is at least a 30:1 difference between a good stator winding and a deteriorated winding which needs maintenance. Thus the new test identifies those motors and generators needing corrective maintenance
41 Data presentation All data presented were obtained using either 80-pF capacitive couplers or SSC s installed within the stator winding. The pulse magnitude is measured in milli volts (mv). The peak positive and negative PD magnitudes (+Qm and -Qm) represent the highest PD pulses measured in mv. Qm is a reasonable predictor of winding insulation condition. A high Qm measured in a winding compared with a lower Qm in another winding usually implies that the former windings is more deteriorated.
42 Database Analysis Method A cumulative version of the statistical distribution is shown in Table 1, which also shows the maximum Qm measured as well as the average Qm. Table 1. Distribution of Qm for hydrogenerators with 80 pf sensors with generator windings For a 13.8kV stator, the average Qm from all tests was 312 mv. 25% of tests had a Qm <38mV. 50% of the tests had a Qm < 96mV, 75% were <194 mv. 90% of tests had a Qm <392 mv. Thus if a Qm of 500 mv is obtained on a 13.8 kv hydrogenator, then it is likely that this stator will be deteriorated, as it has PD levels higher that in 90% of similar machines.
43 Table 2. Distribution of Qm for air cooled stators, 80 pf sensors on terminals of motors and turbogenerators Table 2 illustrates the similar statistical distribution for motors and turbo generators. 80-pF capacitors are installed at the machine terminals. The distributions show that, at the 90% level, turbos seem to have greater PD than hydros.
44 Table 3. PD magnitude distribution for hydrogen-cooled machines at different pressures equipped with 80 pf couplers. Table 3 also shows that as operating hydrogen pressure increases, the 90% Qm PD activity level decreases significally. Clearly, before interpreting a PD result, one needs to know whether the machine is hydrogen or air cooled, and if hydrogencooled what the pressure was at the time of the measurement.
45 Table 4. Slot PD magnitude distribution for hydrogen-cooled machines equipped with SSC Table 4 shows the effect of voltage class and hydrogen pressure on the rest results from SSC. Similarly comparing Table 3 & 4, it is obvious that the PD measured with SSC sensors should be interpreted differently from results acquired with capacitive sensors, that is the 90% levels are usually lower with SSC than with capacitive couplers.
46 Table 5. Effect of winding manufacturing date on PD levels in 13 to 15 KV air cooled stators. Winding Age One surprising result from the statistical analysis of the database was the distribution of Qm as a function of winding age. Table 5 illustrates the PD results in the database from machines that were from 1 yr old to more than 50 yr old.
47 Table 6. Effect of manufacturer on PD levels for 13 to 15 KV stators. Manufacturer Table 6 shows the results for 13kV to 15kV stator. The cause or the differences between manufacturers unknown, but it may be due to different manufacturing processes, electric stress design levels, and assembly methods.
PARTIAL DISCHARGE MEASUREMENT ON ROTATING MACHINES
PARTIAL DISCHARGE MEASUREMENT ON ROTATING MACHINES Engr. IÑIGO V. ESCOPETE, JR. ITC Level 2 Certified Thermographer PHIL-NCB NDT-UT Level 2 Partial Discharge testing is a Condition Based Maintenance tool
More informationCHAPTER 5 CONCEPT OF PD SIGNAL AND PRPD PATTERN
75 CHAPTER 5 CONCEPT OF PD SIGNAL AND PRPD PATTERN 5.1 INTRODUCTION Partial Discharge (PD) detection is an important tool for monitoring insulation conditions in high voltage (HV) devices in power systems.
More informationIRIS POWER TGA-B. Periodic Online Partial Discharge Monitoring Instrument for Turbine Generators and Motors
IRIS POWER TGA-B Periodic Online Partial Discharge Monitoring Instrument for Turbine Generators and Motors We have not found another test method that produces as much decision support data for generator
More informationThe University of New South Wales. School of Electrical Engineering and Telecommunications. High Voltage Systems ELEC9712. Appendix Partial Discharge
The University of New South Wales School of Electrical Engineering and Telecommunications High Voltage Systems ELEC9712 Appendix Partial Discharge Content Introduction Quantities measured Test circuits
More informationPartial Discharge Theory, Modeling and Applications To Electrical Machines
Partial Discharge Theory, Modeling and Applications To Electrical Machines V. Vahidinasab, A. Mosallanejad, A. Gholami Department of Electrical Engineering Iran University of Science and Technology (IUST)
More informationObjective Methods to Interpret Partial-Discharge Data on Rotating-Machine Stator Windings
Objective Methods to Interpret Partial-Discharge Data on Rotating-Machine Stator Windings Greg C. Stone, Fellow, IEEE, and Vicki Warren, Member, IEEE From IEEE Transactions on Industry Applications Vol.
More informationInternational Journal of Advance Engineering and Research Development. Comparison of Partial Discharge Detection Techniques of Transformer
Scientific Journal of Impact Factor(SJIF): 3.134 International Journal of Advance Engineering and Research Development Volume 2,Issue 7, July -2015 e-issn(o): 2348-4470 p-issn(p): 2348-6406 Comparison
More informationBasics of Partial Discharge. Prepared for 2015 Phenix RSM Meeting January 2015
Basics of Partial Discharge Prepared for 2015 Phenix RSM Meeting January 2015 Definitions and History Standard Definitions Fundamentally, what is a Partial Discharge An electric discharge which only partially
More informationAfrica Utility Week Focus Day Substation Condition Monitoring Benefits of Ultrasound
Africa Utility Week Focus Day 2014 Substation Condition Monitoring Benefits of Ultrasound Agenda Review - Substation Condition Monitoring Electrical discharge Types and origin In switchgear Results/consequences
More informationRelative Ability of UHF Antenna and VHF Capacitor Methods to Detect Partial Discharge in Turbine Generator Stator Windings
IEEE Transactions on Dielectrics and Electrical Insulation Vol. 22, No. 6; December 215 369 Relative Ability of UHF Antenna and VHF Capacitor Methods to Detect Partial Discharge in Turbine Generator Stator
More informationDoble Solutions for Partial Discharge. Greg Topjian Solutions Manager
Doble Solutions for Partial Discharge Greg Topjian Solutions Manager 617-393-3129 gtopjian@doble.com Why do we need to conduct PD measurements PD a major cause of early failure for HV insulation. Partial
More informationCONTINUOUS ON-LINE SYSTEM FOR PARTIAL DISCHARGE MONITORING FOR HA1 AT CHE ROBEŞTI
U.P.B. Sci. Bull., Series D, Vol. 77, Iss. 4, 2015 ISSN 1454-2358 CONTINUOUS ON-LINE SYSTEM FOR PARTIAL DISCHARGE MONITORING FOR HA1 AT CHE ROBEŞTI Laurenţiu-Florian ION 1, Apolodor GHEORGHIU 2 A proper
More informationPORTABLE PARTIAL DISCHARGE MONITORING INSTRUMENT
PORTBLE PRTIL ISCHRGE MONITORING INSTRUMENT Periodic Online Monitoring of Partial ischarges on motors, generators, switchgear, isolated phase bus and dry type transformers. MOTORS TURBO GENERTORS HYRO
More informationCondition Assessment of High Voltage Insulation in Power System Equipment. R.E. James and Q. Su. The Institution of Engineering and Technology
Condition Assessment of High Voltage Insulation in Power System Equipment R.E. James and Q. Su The Institution of Engineering and Technology Contents Preface xi 1 Introduction 1 1.1 Interconnection of
More informationKnowledge Is Power SM Apparatus Maintenance and Power Management for Energy Delivery. Application of EMI Diagnostics to Hydro Generators
Knowledge Is Power SM Apparatus Maintenance and Power Management for Energy Delivery Application of EMI Diagnostics to Hydro Generators James Timperley Doble Global Power Services Columbus, Ohio jtimperley@doble.com
More informationA1-209 EXPERIENCES IN IDENTIFICATION OF PARTIAL DISCHARGE PATTERNS IN LARGE HYDROGENERATORS
21, rue d'artois, F-75008 Paris http://www.cigre.org A1-209 Session 2004 CIGRÉ EXPERIENCES IN IDENTIFICATION OF PARTIAL DISCHARGE PATTERNS IN LARGE HYDROGENERATORS CARLOS AZUAJE* WILLIAM TORRES C.V.G.
More informationIRIS POWER PDTracII. Continuous On-line Partial Discharge Monitoring for Motors, Generators, Dry Type Transformers, and Air-Insulated Switchgear.
IRIS POWER PDTracII Continuous On-line Partial Discharge Monitoring for Motors, Generators, Dry Type Transformers, and Air-Insulated Switchgear. We have not found another test method that produces as much
More informationRESIDUAL LIFE ASSESSMENT OF GENERATOR TRANSFORMERS IN OLD HYDRO POWER PLANTS
RESIDUAL LIFE ASSESSMENT OF GENERATOR TRANSFORMERS IN OLD HYDRO POWER PLANTS Authored by: Sanjay Srivastava, Chief Engineer (HE&RM), Rakesh Kumar, Director (HE&RM), R.K. Jayaswal, Dy. Director (HE&RM)
More informationPROPAGATION OF PARTIAL DISCHARGE AND NOISE PULSES IN TURBINE GENERATORS
PROPAGATION OF PARTIAL DISCHARGE AND NOISE PULSES IN TURBINE GENERATORS M. Henriksen, Technical University of Denmark, DK-2800 Lyngby, Denmark G.C. Stone, M. Kurtz, Ontario Hydro, 800 Kipling Avenue, Toronto,
More informationMAHALAKSHMI ENGINEERING COLLEGE
MAHALAKSHMI ENGINEERING COLLEGE TIRUCHIRAPALLI 621213 QUESTION BANK -------------------------------------------------------------------------------------------------------------- Sub. Code : EE2353 Semester
More informationStator Winding Partial Discharge Activity for Air- Cooled Generators
Stator Winding Partial Discharge Activity for Air- Cooled Generators Vicki Warren Qualitrol - Iris Power Toronto, Ontario Canada vwarren@qualitrolcorp.com Abstract Partial discharge (PD) activity has long
More informationAPPLICATIONS OF ACOUSTIC LOCALIZATION TO ONLINE POWER TRANSFORMERS
APPLICATIONS OF ACOUSTIC LOCALIZATION TO ONLINE POWER TRANSFORMERS David Larochelle NDB Technologies Reasons leading to acoustic testing are different weather it is a manufacturing or field environment
More informationPD Solutions. On-Line PD Measurement Devices
On-Line PD Measurement Devices 1. Longshot Device (see Figure 1) The measurement system applied is based around the wideband (0-400 MHz) HVPD- Longshot partial discharge test unit which utilizes a high-speed
More informationIRIS POWER PDTracII. Continuous On-line Partial Discharge Monitoring for Motors, Generators, Dry Type Transformers, and Air-Insulated Switchgear.
IRIS POWER PDTracII Continuous On-line Partial Discharge Monitoring for Motors, Generators, Dry Type Transformers, and Air-Insulated Switchgear. We have not found another test method that produces as much
More informationTHE PROPAGATION OF PARTIAL DISCHARGE PULSES IN A HIGH VOLTAGE CABLE
THE PROPAGATION OF PARTIAL DISCHARGE PULSES IN A HIGH VOLTAGE CABLE Z.Liu, B.T.Phung, T.R.Blackburn and R.E.James School of Electrical Engineering and Telecommuniications University of New South Wales
More informationAdvancements in online partial discharge monitoring and assessment of MV through EHV Substation assets
Advancements in online partial discharge monitoring and assessment of MV through EHV Substation assets Abstract: For decades it has been recognized that partial discharge assessment is an excellent method
More informationInvesti ations Into the Use of Temperature Detectors as # tator Winding Partial Discharge Detectors
Conference Record of the 2006 IEEE International Symposium on Electrical Insulation Investi ations Into the Use of Temperature Detectors as # tator Winding Partial Discharge Detectors S.R. Campbell, G.C.
More informationSimulation Model of Partial Discharge in Power Equipment
Simulation Model of Partial Discharge in Power Equipment Pragati Sharma 1, Arti Bhanddakkar 2 1 Research Scholar, Shri Ram Institute of Technology, Jabalpur, India 2 H.O.D. of Electrical Engineering Department,
More informationGenerator Users Group Annual Conference Core testing, low and high flux, tap. Mladen Sasic, IRIS Power
Generator Users Group Annual Conference 2015 Core testing, low and high flux, tap Mladen Sasic, IRIS Power Stator Cores Cores provide low reluctance paths for working magnetic fluxes Support stator winding,
More informationIN ELECTRICAL ENGINEERING - I C M E T CRAIOVA
Taking into account that power transformer is the major item of equipment in power systems, its correct operation is vital to system operation. It is well known that transformer failures are sometimes
More informationNEW MV CABLE ACCESSORY WITH EMBEDDED SENSOR TO CHECK PARTIAL DISCHARGE ACTIVITY
NEW MV CABLE ACCESSORY WITH EMBEDDED SENSOR TO CHECK PARTIAL DISCHARGE ACTIVITY Lorenzo PERETTO Luigi FODDAI Simone ORRU Luigi PUDDU Altea Switzerland ENEL Italy ENEL Italy REPL Italy lperetto@alteasolutions.com
More informationElectrical Equipment Condition Assessment
Feature Electrical Equipment Condition Assessment Using On-Line Solid Insulation Sampling Importance of Electrical Insulation Electrical insulation plays a vital role in the design and operation of all
More informationPARTIAL DISCHARGE DETECTION - AN OVERVIEW
PARTIAL DISCHARGE DETECTION - AN OVERVIEW 1 MR. N. J. PATEL, 2 PROF. K. K. DUDANI, 3 PROF. A. K. JOSHI 1 M.E. [Power System] P.G. Student, Department of Electrical Engineering, L. E. College of Engineering,
More informationSoftware System for Finding the Incipient Faults in Power Transformers
Software System for Finding the Incipient Faults in Power Transformers Nikolina Petkova Technical University of Sofia, Department of Theoretical Electrical Engineering, 1156 Sofia, Bulgaria Abstract In
More informationPARTIAL DISCHARGE DETECTION AND LOCATION IN TRANSFORMERS BY PERFORMING PARTIAL DISCHARGE TESTS IN OIL USING UHF SENSORS
PARTIAL DISCHARGE DETECTION AND LOCATION IN TRANSFORMERS BY PERFORMING PARTIAL DISCHARGE TESTS IN OIL USING UHF SENSORS by K.K.JEMBU KAILAS and W. ADITHYA KUMAR L&T CONSTRUCTION L&T CONSTRUCTION KKJK@LNTECC.COM
More informationAnalysis of Partial Discharge Patterns for Generator Stator Windings
American Journal of Electrical Power and Energy Systems 2015; 4(2): 17-22 Published online March 11,2015 (http://www.sciencepublishinggroup.com/j/epes) doi: 10.11648/j.epes.20150402.11 ISSN: 2326-912X
More informationFurther Experience in the Use of Existing RTDs in Windings of Motors and Generators for the Measurement of Partial Discharges
Further Experience in the Use of Existing RDs in Windings of Motors and Generators for the Measurement of Partial Discharges Claude Kane Eaton Electrical Predicative Diagnostics 5421 Feltl Road Suite 190
More informationCase Studies of Electric Power Equipment Diagnostics Using Acoustic Emission
17th World Conference on Nondestructive Testing, 25-28 Oct 2008, Shanghai, China Case Studies of Electric Power Equipment Diagnostics Using Acoustic Emission Oswaldo G. SANTOS FILHO 1, Sergio L. ZAGHETTO
More informationThe importance of partial discharge testing throughout the development and operation of power transformers
The importance of partial discharge testing throughout the development and operation of power transformers Ulrike Broniecki OMICRON Energy Solutions GmbH, Berlin Power transformers are exposed to intense
More informationCHAPTER 3 ACOUSTIC EMISSION TECHNIQUE FOR DETECTION AND LOCATION OF PD
63 CHAPTER 3 ACOUSTIC EMISSION TECHNIQUE FOR DETECTION AND LOCATION OF PD 3.1 INTRODUCTION PD measurements on high-voltage equipment, e.g. transformers, could be grouped into two major tasks. First, evidence
More informationPartial Discharge Monitoring and Diagnosis of Power Generator
Partial Discharge Monitoring and Diagnosis of Power Generator Gao Wensheng Institute of High Voltage & insulation tech. Electrical Eng. Dept., Tsinghua University Wsgao@tsinghua.edu.cn Currently preventive
More informationwhat is a multiplier? how does a multiplier work? common multiplier applications II. Assembly Type III. Other Design Concerns
SECTION 13 Multipliers VMI manufactures many high voltage multipliers, most of which are custom designed for specific requirements. The following information provides general information and basic guidance
More informationCharacteristics of Insulation Diagnosis and Failure in Gas Turbine Generator Stator Windings
J Electr Eng Technol Vol. 9, No. 1: 280-285, 2014 http://dx.doi.org/10.5370/jeet.2014.9.1.280 ISSN(Print) 1975-0102 ISSN(Online) 2093-7423 Characteristics of Insulation Diagnosis and Failure in Gas Turbine
More informationTransformer Factory Testing
Transformer Factory Testing John J. Foschia Test Engineer John.Foschia@spx.com September 2018 Reasons for Testing Compliance with user specifications Assessment of quality and reliability Verification
More informationPartial discharge diagnostics on very long and branched cable circuits
11 Nordic Insulation Symposium Stockholm, June 11-13, 2001 Partial discharge diagnostics on very long and branched cable circuits Nico van Schaik, E. Fred Steennis, Wim Boone and Dick M. van Aartrijk KEMA
More informationPARTIAL DISCHARGE MEASUREMENTS ON GENERATORS USING A NOISE GATING SYSTEM
Abstract PARTIAL DISCHARGE MEASUREMENTS ON GENERATORS USING A NOISE GATING SYSTEM Q. SU Department of Electrical & Computer Systems Engineering Monash University, Clayton VIC 3168 Email: qi.su@eng.monash.edu.au
More informationCASE STUDY- FAULT IN POWER TRANSFORMER AT LOKTAK POWER STATION. - S K Mishra & S K Das NHPC Ltd O&M Division
CASE STUDY- FAULT IN POWER TRANSFORMER AT LOKTAK POWER STATION - S K Mishra & S K Das NHPC Ltd O&M Division 1 PRESENTATION COVERS Introduction DESCRIPTION OF EVENTS INITIAL RESPONSE DETAILED INSPECTION
More informationHigh Frequency Voltage Stress. Presented by: Flore Chiang Date: March 30, 2012
High Frequency Voltage Stress Presented by: Flore Chiang Date: March 30, 2012 Now the additional data is available! ground rules: 1. intro to PD. 2. experimental results. 3. comparison with current practice.
More informationPartial Discharge Patterns in High Voltage Insulation
22 IEEE International Conference on Power and Energy (PECon), 2-5 December 22, Kota Kinabalu Sabah, Malaysia Partial Discharge Patterns in High Voltage Insulation Hazlee Illias, Teo Soon Yuan, Ab Halim
More informationTHE POWER OF LIFE. WinTech Partial Discharge based Predictive Intelligence of insulation system to eliminate power failure risk.
THE POWER OF LIFE WinTech Partial Discharge based Predictive Intelligence of insulation system to eliminate power failure risk. Mr. Neal Yang Pro.E.E. Engineer About Us The flaw of dielectric material
More informationTECHIMP Technologies & Services for Diagnostics and Monitoring of High Voltage Assets
TECHIMP Technologies & Services for Diagnostics and Monitoring of High Voltage Assets Who we are TECHIMP is one of the leading providers of Condition Assessment Services Data Acquisition and Test Equipment
More informationMeasurement Of Partial Discharge (PD) In High Voltage Power Equipment
First International Conference on Emerging Trends in Engineering, Management and Scineces December 28-3, 214 (ICETEMS-214)Peshawar,Pakistan Measurement Of Partial Discharge (PD) In High Voltage Power Equipment
More informationXu Xiao Ming, AP Services, March 2010 Machine services Life expectance analysis program (LEAP)
Xu Xiao Ming, AP Services, March 2010 Machine services Life expectance analysis program (LEAP) April 12, 2010 Slide 1 Content MV Machine Winding Insulation Stress LEAP Methodology LEAP Standard LEAP from
More informationPD Diagnostic Applications and TechImp solutions
PD Diagnostic Applications and TechImp solutions Condition Assessment Solutions for Electrical Systems. PD based innovative tools for the Condition Based Maintenance. MD-04.05.004 - rev. 00-29/08/2006
More informationTesting and PD Diagnosis of MV Cable Systems with DAC Voltage Educational Session May St Pete Beach, Fl
Testing and PD Diagnosis of MV Cable Systems with DAC Voltage Educational Session May 26 2011 St Pete Beach, Fl HDW ELECTRONICS, INC. THE BEST IN CABLE FAULT LOCATING TECHNOLOGY by Henning Oetjen Frank
More informationWhy partial discharge testing makes good sense
Why partial discharge testing makes good sense PD measurement and analysis have proven to be reliable for detecting defects in the insulation system of electrical assets before major damage or a breakdown
More informationApplication Note. Detection of Partial Discharge Using Ultrasound. Detection of Partial Discharge Using Ultrasound. Problem. iriss.
Detection of Partial Discharge Using Ultrasound Problem In electrical systems, especially above 1,000 Volts, sufficient and properly maintained equipment insulation helps ensure equipment longevity. However,
More informationEFFECT OF INTEGRATION ERROR ON PARTIAL DISCHARGE MEASUREMENTS ON CAST RESIN TRANSFORMERS. C. Ceretta, R. Gobbo, G. Pesavento
Sept. 22-24, 28, Florence, Italy EFFECT OF INTEGRATION ERROR ON PARTIAL DISCHARGE MEASUREMENTS ON CAST RESIN TRANSFORMERS C. Ceretta, R. Gobbo, G. Pesavento Dept. of Electrical Engineering University of
More informationDiagnostic testing of cast resin transformers
Paper of the Month Diagnostic testing of cast resin transformers Author Michael Krüger, OMICRON, Austria michael.krueger@omiconenergy.com Christoph Engelen, OMICRON, Austria christoph.engelen@omicronenergy.com
More informationPDS100 Application Note: The use of High Frequency Current Transformer as sensor for Transformer diagnostics
PDS100 Application Note: The use of High Frequency Current Transformer as sensor for Transformer diagnostics CASE STUDY 1 (Doble Client Conference 2011, ACCA committee meeting) Dissolved Gas Analysis (DGA)
More informationThe Reflective Wave Phenomena
Application Note The Reflective Wave Phenomena Rev2.doc The Reflective Wave Phenomena Note to Specifiers This application note contains Cutler-Hammer s recommendations for the application of filters for
More information1409. Comparison study between acoustic and optical sensors for acoustic wave
1409. Comparison study between acoustic and optical sensors for acoustic wave Malik Abdulrazzaq Alsaedi Department of Electrical, Faculty of Engineering, University of Misan, Amarah, Iraq E-mail: maliksaady@yahoo.com
More informationAcoustic Emission in power transformers. Ajusco 15, Colonia Portales, Delegación Benito Juárez, C.P , México, D.F.
Acoustic Emission in power transformers 1 More expensive equipment in the substation Many years of operation First indication of a problem: Dissolved Gases Begin investigation to determine the origin of
More informationThe Synthesis and Analysis of Partial Discharges from Stator Winding Insulation of Hydro Generators
ANALELE UNIVERSITĂłII EFTIMIE MURGU REŞIłA ANUL XIV, NR. 1, 2007, ISSN 1453-7397 Mihaela Răduca, Ana-Maria Pittner, Eugen Răduca, Iancu Tătucu The Synthesis and Analysis of Partial Discharges from Stator
More informationDirect Current Motor Electrical Evaluation Using Motor Circuit Analysis
Direct Current Motor Electrical Evaluation Using Motor Circuit Analysis Introduction Howard W. Penrose, Ph.D BJM Corp, ALL-TEST Division Old Saybrook, CT Electrical testing of Direct Current (DC) electric
More informationPractical Experience in On-Line Partial Discharge Measurements of MV Switchgear Systems
Practical Experience in On-Line Partial Discharge Measurements of MV Switchgear Systems Z. Berler, I. Blokhintsev, A. Golubev, G. Paoletti, V. Rashkes, A. Romashkov Cutler-Hammer Predictive Diagnostics
More informationGENERATOR TESTING APPLICATION GUIDE. reliable. precision.
GENERATOR TESTING APPLICATION GUIDE www.haefely-hipotronics.com reliable. precision. 2 GENERATOR TESTING CONTENTS Product Line Overview 3 AC Hipot Testing 4 Partial Discharge Measurement 5 DC Hipot Testing
More informationHVDC Transmission. Michael Muhr. Institute of High Voltage Engineering and System Performance Graz University of Technology Austria P A S S I O N
S C I E N C E P A S S I O N T E C H N O L O G Y HVDC Transmission Michael Muhr Graz University of Technology Austria www.tugraz.at 1 Definition HV High Voltage AC Voltage > 60kV 220kV DC Voltage > 60kV
More informationExtended analysis versus frequency of partial discharges phenomena, in support of quality assessment of insulating systems
Extended analysis versus frequency of partial discharges phenomena, in support of quality assessment of insulating systems Romeo C. Ciobanu, Cristina Schreiner, Ramona Burlacu, Cristina Bratescu Technical
More informationprocess has few stages and is highly repeatable. Excellent mechanic properties and electro-magnetic compatibility. Planar design gives the height lowe
PARTIAL DISCHARGE IN PLANAR TRANSFORMER Ing. Anar MAMMADOV, Doctoral Degreee Programme (1) Dept. of Microelectronics, FEEC, BUT E-mail: xmamed00@stud.feec.vutbr.cz Supervised by Dr. Jaroslav Boušek ABSTRACT
More informationMTE training MTE Corporation
1 MTE Corporation Improving the Performance and Reliability of Power Electronic Systems 2 MTE solutions to Long lead dive applications Protection of motors drive cables and Variable frequency inverters
More informationTRANSFORMERS PART A. 2. What is the turns ratio and transformer ratio of transformer? Turns ratio = N2/ N1 Transformer = E2/E1 = I1/ I2 =K
UNIT II TRANSFORMERS PART A 1. Define a transformer? A transformer is a static device which changes the alternating voltage from one level to another. 2. What is the turns ratio and transformer ratio of
More informationAbstract. 1 Introduction
Using optical couplers to monitor the condition of electricity infrastructure S.G. Swingler, L. Hao, P.L. Lewin and D.J. Swaffield The Tony Davies High Voltage Laboratory, University of Southampton, Southampton
More informationOMICRON Seminar on Substation Testing and Diagnosis. October 23, 2017 Dubai, United Arab Emirates. October 24, 2017 Abu Dhabi, United Arab Emirates
OMICRON Seminar on Substation Testing and Diagnosis October 23, 2017 Dubai, United Arab Emirates October 24, 2017 Abu Dhabi, United Arab Emirates Time Optimized Substation Asset Testing and Diagnosis Agenda
More informationPOWER TRANSFORMER SPECIFICATION, DESIGN, QUALITY CONTROL AND TESTING 18 MARCH 2009
POWER TRANSFORMER SPECIFICATION, DESIGN, QUALITY CONTROL AND TESTING 18 MARCH 2009 Nkosinathi Buthelezi Senior Consultant: Power Transformers and Reactors Presentation Content Standardization of Power
More informationII. TRADITIONAL APPROACH OF PD MEASUREMENTS
Advantages of Continuous Monitoring of Partial Discharges in Rotating Equipment and Switchgear Claude Kane Cutler Hammer Predictive Diagnostics 5421 Feltl Road, Suite 190 Minnetonka, MN 55343 Phone: 952-912-1358
More informationInstruction Manual. For Type E Plasma Tube Electrodes
Instruction Manual For Type E Plasma Tube Electrodes For the Cheb SSQ-PT, SSQ-ST, SSQ-BAT and 2 Original Super Tube Plasma Tubes With External Electrodes (With or without attached wire leads) Type E1 electrode
More informationEffective Maintenance Test Techniques and Diagnostic Measurements to Improve the Performance and Reliability of Power System Transformers
Effective Maintenance Test Techniques and Diagnostic Measurements to Improve the Performance and Reliability of Power System Transformers Alexander Dierks, Herman Viljoen, Alectrix (Pty) Ltd, South Africa
More informationChapter 7 Conclusion 7.1 General
Chapter 7 7.1 General The mechanical integrity of a transformer winding is challenged by several mechanisms. Many dielectric failures in transformers are direct results of reduced mechanical strength due
More informationHIGH VOLTAGE ENGINEERING(FEEE6402) LECTURER-24
LECTURER-24 GENERATION OF HIGH ALTERNATING VOLTAGES When test voltage requirements are less than about 300kV, a single transformer can be used for test purposes. The impedance of the transformer should
More informationGE Ventilated Dry-Type Transformers. Secondary Substation Transformers - 5 and 15kV Class
GE Ventilated Dry-Type Transformers Secondary Substation Transformers - 5 and 15kV Class GE ventilated dry-type transformers are designed for indoor or outdoor applications in schools, hospitals, industrial
More informationAnalysis of Propagation Paths of Partial Discharge Acoustic Emission Signals
Analysis of Propagation Paths of Partial Discharge Acoustic Emission Signals Prathamesh Dhole, Tanmoy Sinha, Sumeet Nayak, Prasanta Kundu, N.K.Kishore Abstract Transformers are one of the most important
More informationDielectric response and partial discharge measurements on stator insulation at varied low frequency. Nathaniel Taylor
Dielectric response and partial discharge measurements on stator insulation at varied low frequency Nathaniel Taylor Rotating Electrical Machines : The Stator and its Windings turbo-generator motor hydro-generator
More informationTesTIng of Power. Transformers are the largest, most. feature. By brandon dupuis
feature By brandon dupuis An Introduction to Electrical diagnostic TesTIng of Power Transformers 38 Transformers are the largest, most expensive, and highly critical components of most utility substations.
More informationEffective maintenance test techniques for power transformers
Effective maintenance test techniques for power transformers by Alexander Dierks, Herman Viljoen, Alectrix, South Africa, and Dr. Michael Krüger, Omicron Electronics, Austria Due to ever-increasing pressure
More informationPARTIAL DISCHARGE MEASUREMENT AS A DIAGNOSTIC TOOL FOR CURRENT TRANSFORMER
PARTIAL DISCHARGE MEASUREMENT AS A DIAGNOSTIC TOOL FOR CURRENT TRANSFORMER N. R. Bhasme 1 and Bhushan Salokhe 2 1 Associate Prof., 2 M.E. Student, Dept. of Electrical Engg., Govt. College of Engineering
More informationOpen Access Application of Partial Discharge Online Monitoring Technology in ± 660kV Converter Transformer
Send Orders for Reprints to reprints@benthamscience.ae 784 The Open Automation and Control Systems Journal, 2015, 7, 784-791 Open Access Application of Partial Discharge Online Monitoring Technology in
More informationScale Manufacturers Association (SMA) Recommendation on. Electrical Disturbance
Scale Manufacturers Association (SMA) Recommendation on Electrical Disturbance (SMA RED-0499) Provisional First Edition Approved by SMA Pending Final Comment April 24, 1999 Copyright: SMA, April, 1999
More informationPartial Discharge Analysis of a Solid Dielectric Using MATLAB Simulink
ISSN (Online) 2321 24 Vol. 4, Issue 6, June 2 Partial Discharge Analysis of a Solid Dielectric Using MATLAB Simulink C Sunil kumar 1, Harisha K S 2, Gouthami N 3, Harshitha V 4, Madhu C Assistant Professor,
More informationVariation in SFRA plot due to design and external parameter
Chapter 6 Variation in SFRA plot due to design and external parameter 6.1 Introduction As the experience grows with Sweep Frequency Response Analysis in world, it is useful to discuss the measurements
More informationGrounding System Theory and Practice
Grounding System Theory and Practice Course No. E-3046 Credit: 3 PDH Grounding System Theory and Practice Velimir Lackovic, Electrical Engineer System grounding has been used since electrical power systems
More informationInnovative Test Techniques and Diagnostic Measurements to Improve the Performance and Reliability of Power System Transformers
Innovative Test Techniques and Diagnostic Measurements to Improve the Performance and Reliability of Power System Transformers Dr. Michael Krüger, Alexander Kraetge, OMICRON electronics GmbH, Austria Alexander
More informationThe Generators and Electric Motor Monitoring and Diagnostics Systems
The Generators and Electric Motor Monitoring and Diagnostics Systems MDR and PGU-DM 1 The «MDR» - Motor Diagnostics Relay the Universal System for Insulation Monitoring in Electric Machines PD-Monitor
More informationBasic Principles and Operation of Transformer
Basic Principles and Operation of Transformer CONSTRUCTIONAL ASPECTS Cores In order to enhance core s magnetic properties, it is constructed from an iron and silicon mixture (alloy). The magnetic core
More informationLOW VOLTAGE PWM INVERTER-FED MOTOR INSULATION ISSUES
LOW VOLTAGE PWM INVERTER-FED MOTOR INSULATION ISSUES Copyright Material IEEE Paper No. PCIC-4-15 RAPS-1433 Abstract - The topic of how low voltage IGBT-based PWM inverters create additional insulation
More informationCHAPTER 1 INTRODUCTION
1 CHAPTER 1 INTRODUCTION 1.1 GENERAL Induction motor drives with squirrel cage type machines have been the workhorse in industry for variable-speed applications in wide power range that covers from fractional
More informationTRAFTOR WINDINGS CHANGING THE RULES TOROIDAL INDUCTORS & TRANSFORMERS SOLUTIONS PROVIDER AND MANUFACTURER
TRAFTOR WINDINGS CHANGING THE RULES TOROIDAL INDUCTORS & TRANSFORMERS SOLUTIONS PROVIDER AND MANUFACTURER PRODUCT RANGE POWER INDUCTORS Toroidal technology, driven by 20 years of R&D. POWER TRANSFORMERS
More informationUnderstanding the Value of Electrical Testing for Power Transformers. Charles Sweetser, OMICRON electronics Corp. USA
Understanding the Value of Electrical Testing for Power Transformers Charles Sweetser, OMICRON electronics Corp. USA Understanding the Value of Electrical Testing for Power Transformers Charles Sweetser,
More informationPartial Discharge Classification Using Acoustic Signals and Artificial Neural Networks
Proc. 2018 Electrostatics Joint Conference 1 Partial Discharge Classification Using Acoustic Signals and Artificial Neural Networks Satish Kumar Polisetty, Shesha Jayaram and Ayman El-Hag Department of
More information