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Omicron CP CR500, User Manual

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Omicron CP CR500 User Manual Download Page 35

35

Diagnostic of Rotating Machines Insulation

6.5   Literature

IEEE 286 - 2000,  "Recommended Practice for Measurement of Power Factor 
Tip-Up of Electric Machinery Stator Coil Insulation".

IEC 60894 -1987, "Guide for a test procedure for the measurement of loss 
tangent of coils and bars for machine windings".

Summary of Contents for CP CR500

Page 1: ...CP CR500 User Manual COMPENSATING REACTOR FOR DISSIPATION FACTOR TANGENT DELTA MEASUREMENTS AT LARGE GENERATORS AND MOTORS in combination with CP TD1...

Page 2: ...anual represent the technical status at the time of writing and are subject to change without prior notice We have done our best to ensure that the information given in this manual is useful accurate...

Page 3: ...s 11 3 3 Low Voltage Connector LV 12 3 4 Safety Connection 12 3 5 Equipotential Ground 12 4 Setting Up the Test 13 4 1 First Step Grounding 13 4 2 Connecting CPC 100 to CP TD1 14 4 3 Connecting the CP...

Page 4: ...n Delta or TIP UP Test 24 6 2 1 Purpose and Theory 24 6 2 2 Interpretation 26 6 3 The Dielectric Response of Winding Insulation 27 6 4 Example C Tan Delta Measurements on a Generator 28 6 5 Literature...

Page 5: ...he Erection and Operation of Electrical Test Equipment as well as the applicable regulations for accident prevention in the country and at the site of operation has to be met 1 1 Related Documents The...

Page 6: ...CP CR500 6...

Page 7: ...ng tests using high voltage please read the following Do not perform any test without having carefully read the CPC 100 CP TD1 and CP CR500 user manuals Read in particular all safety instructions and...

Page 8: ...les as live and due to the high voltage life hazardous 2 2 Handling the High Voltage Cables and the CP CR500 Before handling the high voltage cables or the CP CR500 proceed as follows 1 Press the emer...

Page 9: ...his user manual 4 Do not operate the CP CR500 without connecting the safety circuit 5 Make sure that the connectors are tighlty fit before turning on the high voltage 6 Turn on the high voltage only f...

Page 10: ...CP CR500 10...

Page 11: ...CP CR500 compensation reactor are two high power inductors with an inductive reactance of 40 H each Both are capable to compensate 1 A Connected in parallel 2 A can be compensated by an inductive rea...

Page 12: ...nnectors are used for the safety circuit 3 5 Equipotential Ground The connector EG is connected with the CP CR500 s equipotential ground functional earth protective earth Caution For a safe operation...

Page 13: ...nvolved and the trolley if used are connected to the common equipotential ground Use earth connection cables of at least 6 mm cross section Never operate the test setup without solid grounding Connect...

Page 14: ...The data cable also provides the power supply for CP TD1 4 3 Connecting the CP CR500 to a CPC 100 Safety Circuit 1 Remove the dongle from CPC 100 s connector for external safety functions at the right...

Page 15: ...onnect low side of the test object to equipotential gound 3 Connect the CP CR500 s high voltage cable to the high voltage socket HV1 or HV2 4 Connect the CP CR500 s LV connector to CP TD1 s connector...

Page 16: ...ws all possible capacities to compensate with different numbers of CP CR500 Connection Configuration C values F and Vmax values kV at different resonance frequencies Hz inductor L H Imax A 35 42 50 60...

Page 17: ...e 4 4 Connecting two CP CR500 units in parallel Connection Configuration C values F and Vmax values kV at different resonance frequencies Hz units parll L H Imax A 35 42 50 60 71 85 Hz 1 1 40 0 1 0 0...

Page 18: ...CP CR500 18...

Page 19: ...nce measurement 5 Push the CPC 100 I O button Test Start Stop 6 Adjust the test frequency until the minimum current is displayed if the angle value is negative decrease the frequency if the angle valu...

Page 20: ...CP CR500 20 5 2 Carry Out the Test 5 2 1 Grounded Specimen Test Take the GSTgA B mode acc to sections 4 4 until section 4 6...

Page 21: ...ance C and Dissipation Factor DF often also called Tan delta or power factor PF measurement is an established and important insulation diagnosis method It can detect insulation failures aging of insul...

Page 22: ...CP CR500 22 Figure 6 1 Simplified circuit diagram of a capacitor Figure 6 2 Definition of dissipation factor tan and the vector diagram ICP U CP IRP RP I Re IRp U ICp I jIm tan 1 R P C P...

Page 23: ...nes Insulation The correlation between the Dissipation Factor and Power Factor PF cos and the vector diagram are shown in figure 6 3 Figure 6 3 Correlation between DF and PF Im ICN ICX UO Re With 1 si...

Page 24: ...e provided from the power supply Consequently in a coil with delaminated insulation perhaps due to long term overheating as the voltage increases and PD starts to occur the DF and PF will increase abo...

Page 25: ...ng mechanisms that produce PD Measurement of the tip up is complicated by the presence of silicon carbide stress control coatings on coils rated 6 kV or above At low voltage the silicon carbide is ess...

Page 26: ...gs Tan Delta and tip up tests are used for trending If the tip up is measured every few years and the tip up starts increasing from the normal level then it is likely that the winding has significant...

Page 27: ...ulation The test is made at low test voltages of about 100 V to 200 V from 15 Hz to 400 Hz In this case also high capacitance can be tested without compensating reactors The value at rated frequency 5...

Page 28: ...CP CR500 28 6 4 Example C Tan Delta Measurements on a Generator Step 1 Follow all safety rules for switching off the generator and grounding it Figure 6 7 11 MVA generator...

Page 29: ...ines Insulation Step 2 Isolation of the busbars and connection Figure 6 8 Circuit diagram CGenerator If possible all generator busbars should be isolated Then the phases can be measured separately and...

Page 30: ...ta Figure 6 9 Input of name plate data Step 4 Measurement of the capacitance GSTgA B mode Figure 6 10 Measurement of the capacitance Phase A The capacitance per phase is 104 6 nF With one coil 40 H th...

Page 31: ...ic of Rotating Machines Insulation This result can also be determined using the graph in picture Resonance frequencies function of capacity on page 36 in section 6 6 Appendix Figure 6 11 Connecting th...

Page 32: ...12 Measurement of the resonance frequency Step 6 Measurement of the TIP UP and TIP DOWN GSTgA B mode Figure 6 13 TIP UP TIP DOWN measurement Up and Down tests can be programmed by entering a series of...

Page 33: ...de Figure 6 14 Measurement the dielectric response Step 8 Results Figure 6 15 Tan Delta f V Note The results displayed in figures 6 15 6 16 and 6 17 show curves of a good generator isolation Tan Delta...

Page 34: ...ctric response Tan Delta f f at 200 V delta Tan Delta f V 0 15 0 10 0 05 0 00 0 05 0 10 0 15 0 20 0V 1000V 2000V 3000V 4000V 5000V 6000V 7000V 8000V R L1 A S L2 B T L3 C Tan Delta f f 0 3 0 4 0 5 0 6...

Page 35: ...5 Literature IEEE 286 2000 Recommended Practice for Measurement of Power Factor Tip Up of Electric Machinery Stator Coil Insulation IEC 60894 1987 Guide for a test procedure for the measurement of los...

Page 36: ...f capacity at different numbers of compensation inductors 1 L 40H 40 50 60 70 80 90 100 110 120 0 05 0 10 0 15 0 20 0 25 0 30 Capacitance F Frequency Hz 2 L 20H 45 0 50 0 55 0 60 0 65 0 70 0 75 0 0 25...

Page 37: ...ion 3 L 13 3H 40 0 45 0 50 0 55 0 60 0 65 0 5 0E 07 5 5E 07 6 0E 07 6 5E 07 7 0E 07 7 5E 07 8 0E 07 Capacitance F Frequency Hz 4 L 10H 50 0 51 0 52 0 53 0 54 0 55 0 56 0 57 0 58 0 59 0 0 75 0 80 0 85...

Page 38: ...CP CR500 38...

Page 39: ...EN61010 1 A2 1995 EN61326 1 1997 EN61000 3 2 3 The following technical documentation is ready to be looked at TYPE TEST CERTIFICATE from OMICRON electronics GmbH This material can be seen at OMICRON...

Page 40: ...CP CR500 40...

Page 41: ...N electronics Asia Ltd Hong Kong Phone 852 2634 0377 E Mail support asia omicron at Web www omicron at North and South America OMICRON electronics Corp USA Phone 1 713 830 4660 or 1 800 OMICRON E Mail...

Page 42: ...OMICRON Contact Addresses 42...

Page 43: ...insulation 21 dielectric losses 21 dielectric response measurement 33 Tan Delta f f at 200 V 34 dissipation factor correlation betwwen DF and power factor 23 definition 22 dissipation factor measurem...

Page 44: ...earth 12 R resonance frequency 19 S Safety A 12 Safety B 12 safety instructions READ CAREFULLY 7 T Tan Delta measurement 21 Tan Delta f V 33 Tan Delta measurement 11 TanDelta test card 19 technical su...

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