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Omicron CP CR500 User Manual

Compensating reactor for dissipation factor / tangent delta measurements at large generators and motors
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CP CR500
User Manual
COMPENSATING REACTOR FOR
DISSIPATION FACTOR / TANGENT
DELTA MEASUREMENTS AT
LARGE GENERATORS AND
MOTORS
in combination with CP TD1

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Summary of Contents for Omicron 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 The user is responsible for every application that makes use of an OMICRON product. OMICRON electronics translates this manual from the source language English into a number of other languages. Any translation of this manual is done for local requirements, and in the event of a dispute...

  • Page 3: Table Of Contents

    2.3 Operating the CP CR500........
  • Page 4 CP CR500 Diagnostic of Rotating Machines Insulation ..... . . 21 6.1 Tan Delta Measurements ........21 6.2 The D Tan Delta"...

  • Page 5: Using This Manual

    Using this Manual 1 Using this Manual The purpose of this user manual is to get you quickly started with the CP CR500. The user manual guides you through the process of measuring Dissipation Factor / Tangent Delta at large generators and motors with the test system CP TD1.
  • Page 6 CP CR500...

  • Page 7: Safety Instructions

    Before operating the CP CR500, please carefully read the following safety instructions. It is not recommended that the CP CR500 be used (or even turned on) without understanding the information in this manual. The CP CR500 should only be operated by trained personnel.

  • Page 8: Handling The High-Voltage Cables And The Cp Cr500

    CP CR500 – Properly ground CP CR500, CP TD1 and CPC 100 by connecting them to the common equipotential ground. Use earth connection cables of at least 6 mm² cross-section. Never operate the CP CR500 without solid grounding. – Never touch the high-voltage sockets of the CP CR500 during operation.

  • Page 9: Operating The Cp Cr500

    CP TD1 may not give any acoustic warning sound. 2. Secure the CP CR500 unit with a chain or a barrier tape at a distance of at least 1 m / 3 ft to prevent an accidental entering of the dangerous zone during operation.
  • Page 10 CP CR500...

  • Page 11: Description

    80 nF can be compensated at 50 Hz. For larger capacities more current is required. The CP CR500 contains two inductors. In parallel to the test object it forms a resonant circuit, which is able to compensate reactive power. By tuning the frequency via CPC 100 and CP TD1, the circuit can be brought into resonance.

  • Page 12: Low-Voltage Connector (Lv)

    Interface Panel” on page 12). 3.4 Safety Connection On the interface panel of the CP CR500, there are two D-Sub 9 connectors (male and female) named Safety A (male) and Safety B (female). These connectors are used for the safety circuit.

  • Page 13: Setting Up The Test

    Setting Up the Test 4 Setting Up the Test The test setup consists of the CPC 100 and CP TD1 test system, the CP CR500 compensating reactor(s) and the test object itself. 4.1 First Step: Grounding Caution: For a safe operation make sure that all units involved and the trolley, if used, are connected to the common equipotential ground.

  • Page 14: Connecting Cpc 100 To Cp Td1

    CPC 100’s connector for external safety functions using the modem cable (length 9 meter). 3. Terminate the Safety B connector at the CP CR500 interface panel with the CPC 100 dongle that is normally plugged in at the CPC 100’s connector for external safety functions.

  • Page 15: Connecting The Cp Cr500 To The Test Object

    5. Secure the CP CR500 unit with a chain or a barrier tape at a distance of at least 1 m / 3 ft to prevent an accidental entering of the dangerous zone during operation.

  • Page 16: Connecting Both Inductors Of A Cp Cr500

    CP CR500 4.5 Connecting Both Inductors of a CP CR500 The CP CR500 contains two inductors with 40 H each. If one inductor alone cannot compensate the designated capacity, a second inductor can be connected in parallel. Connection Configuration C-values [μF] and V...
  • Page 17 2.07/7.7 1.44/9.3 1.01/11 0.70/11 0.50/11 0.35/11 μF/kV 1. If you apply a second CP CR500 unit, connect it to the Safety B connector of the first CP CR500 unit using the second modem-cable (length 9 m). Close the Safety B connector on the second unit with the CPC 100 dongle.
  • Page 18 CP CR500...

  • Page 19: Testing

    Testing 5 Testing 5.1 Find Resonance Frequency 1. After everything is properly connected, open a TanDelta test card at the CPC 100. 2. Set test voltage to 500 V. 3. At the "Mode" list box on the TanDelta test card (main page), select the "GST"...

  • Page 20: Carry Out The Test

    CP CR500 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: Diagnostic Of Rotating Machines Insulation

    Diagnostic of Rotating Machines Insulation 6 Diagnostic of Rotating Machines Insulation For motors and generators, the expected life of a stator winding depends on the ability of the electrical insulation to prevent winding faults. High temperatures, and high rates of temperature changes, can generate inner micro-voids particularly at the interface between Mica and resin, and between semiconductive layers and the resin.
  • Page 22 CP CR500 Figure 6-1: Simplified circuit diagram of a capacitor Figure 6-2: Definition of dissipation -- -- -- -- -- -- -- -- - - δ δ factor (tan ) and the ω C vector diagram δ...
  • Page 23 Diagnostic of Rotating Machines Insulation ϕ 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 Withδ 1 « δ ≅ δ ≅...

  • Page 24: The D Tan Delta" Or "Tip-Up" Test

    CP CR500 6.2 The Δ Tan Delta" or "TIP-UP" Test Δ In IEC 60894 the " Tan Delta" test and in IEEE 286 the "Tip-up" are described. Δ Both Tan-Delta and Tip-up are an indirect way of determining if partial discharges (PD) are occurring in a high voltage stator winding.
  • Page 25 Diagnostic of Rotating Machines Insulation Figure 6-4: Power Factor "Tip-Up" according to IEEE 286 Power Factor Tip-up 1.1 1.2 Applied Test Voltage, x U Figure 6-5: δ "Δ tan " as a function of tan δ the test voltage according to IEC 60894 δ...

  • Page 26: Interpretation

    CP CR500 Capacitive charging currents flow through the insulation and then through the coating. The charging currents flowing through the resistance of the coating produce an I²R loss in the coating. The DF or PF measuring device measures this loss. Since the loss is nearly zero at low voltage, and non-zero at operating voltage, the coating yields its own contribution to tip -up.

  • Page 27: The Dielectric Response Of Winding Insulation

    Diagnostic of Rotating Machines Insulation 6.3 The Dielectric Response of Winding Insulation With the dielectric response measurement at low test voltages, the general insulation aging and the water content in the insulation can be checked. Figure 6-6: Dielectric response of the winding insulation 0.85 % low w ater content...

  • Page 28: Example: C - Tan Delta Measurements On A Generator

    CP CR500 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 Diagnostic of Rotating Machines Insulation Step 2: Isolation of the busbars and connection Figure 6-8: Circuit diagram Generator If possible, all generator busbars should be isolated. Then the phases can be measured separately and can be compared to each other.
  • Page 30 CP CR500 Step 3: Input of the name plate data 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.
  • Page 31 Diagnostic 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 the CP CR500...
  • Page 32 CP CR500 Step 5: Measurement of the resonance frequency (GST mode) Figure 6-12: 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 test voltages...
  • Page 33 Diagnostic of Rotating Machines Insulation Step 7: Measurement of the dielectric response (GSTgA+B mode) Figure 6-14: Measurement the dielectric response Step 8: Results Figure 6-15: Tan Delta = f (V) Tan Delta = f (V) 1.20 R (L1/A) 1.10 S (L2/B) 1.00 T (L3/C) 0.90...
  • Page 34 CP CR500 Figure 6-16: Δ Tan Delta = f (V) delta Tan Delta = f (V) 0.20 R (L1/A) 0.15 S (L2/B) 0.10 T (L3/C) 0.05 0.00 1000V 2000V 3000V 4000V 5000V 6000V 7000V 8000V -0.05 -0.10 -0.15 Figure 6-17:...

  • Page 35: Literature

    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".

  • Page 36: Appendix

    CP CR500 6.6 Appendix Resonance frequencies = function of capacity at different numbers of compensation inductors. 1 L [40H] 0.05 0.10 0.15 0.20 0.25 0.30 Capacitance [µF] 2 L [20H] 75.0 70.0 65.0 60.0 55.0 50.0 45.0 0.25 0.30 0.35 0.40...
  • Page 37 Diagnostic of Rotating Machines Insulation 3 L [13.3H] 65.0 60.0 55.0 50.0 45.0 40.0 5.0E-07 5.5E-07 6.0E-07 6.5E-07 7.0E-07 7.5E-07 8.0E-07 Capacitance [F] 4 L [10H] 59.0 58.0 57.0 56.0 55.0 54.0 53.0 52.0 51.0 50.0 0.75 0.80 0.85 0.90 0.95 1.00 Capacitance [µF]...
  • Page 38 CP CR500...

  • Page 39: Declaration Of Conformity

    2006 Signature: *The high-voltage (HV) components like HV sockets of CP TD1 and CP CR500, the hot end of the HV cable and the HV clamps have some live parts during testing. These components in combination with CPC 100 are designed to operate according the standards EN 50191 and VDE 104. The user has to take care of components that can have live wires by following the safety instructions.
  • Page 40 CP CR500...

  • Page 41: Contact Information / Technical Support

    OMICRON electronics Corp. USA Phone: +1 713 830-4660 or 1 800 OMICRON E-Mail: techsupport@omicronusa.com Web: www.omicronusa.com For addresses of OMICRON offices with customer service centers, regional sales offices or offices for training, consulting and commissioning please visit our Web site.
  • Page 42 OMICRON Contact Addresses...

  • Page 43: Index

    CP CR500 to test object ... . . 15 grounding CP CR500 ....8 CPC 100 to CP TD1 .
  • Page 44 CP CR500 power factor correlation between PF and dissipation factor ....23 measurement ..... . 21 protective earth .

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