ABB RARIC User Manual
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ABB RARIC User Manual

Shaft current protection
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Features
RARIC
Shaft current protection
• Sensitive protection for bearings of large rotating machines
• Operates for shaft currents larger than 0,3 - 0,8 A AC, depend-
ing on the diameter of the shaft
• Fundamental or third harmonic operating principle
• AC or DC powered, galvanically isolated
• Shaft current transformer with test winding
• Can be applied to shafts with diameters up to 2960 mm
• Settable time delay
• Trip relay with heavy duty contacts and indicating flag
• Test switch
User's guide
1MRK 502 001-UEN
Revision: A
Issued January 2003
Data subject to change
without notice
xx02000677.jpg

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Summary of Contents for ABB RARIC

  • Page 1 RARIC User’s guide Shaft current protection 1MRK 502 001-UEN Revision: A Issued January 2003 Data subject to change without notice xx02000677.jpg Features • Sensitive protection for bearings of large rotating machines • Operates for shaft currents larger than 0,3 - 0,8 A AC, depend- ing on the diameter of the shaft •...

  • Page 2: Table Of Contents

    Page 2 Shaft current protection Contents Page APPLICATION ................3 DESIGN..................4 The RARIC protection ............. 4 The ILDD shaft current transformer......5 MODE OF OPERATION............6 RECEIVING, STORAGE AND INSTALLATION ....8 Receiving ................8 Storage................8 Installation ................. 8 SETTING, TESTING AND COMMISSIONING ....

  • Page 3: Application

    Severe damage on the bearings is not expected to occur if the shaft current is less than one ampere. Shaft current protection RARIC with a special current transformer ILDD is used to detect currents that can damage the bearings of a generator. The relay can be used for generators with shaft diameter up to 2960 mm.

  • Page 4: Design

    2 DESIGN 2.1 The RARIC protection The RARIC protection is built up of a test switch, terminal bases, plug-in modules and connection parts of type COMBIFLEX. The test switch and the terminal bases are screwed to two apparatus bars. The plug-in modules are inserted and screwed to the terminal bases.

  • Page 5: The Ildd Shaft Current Transformer

    S, see Fig. 2. The pilot-wires to the RARIC protection are connected to terminals S1 -S2, see Fig. 2. The test winding has four turns and is connected to terminals marked...

  • Page 6: Mode Of Operation

    0.5 mA of RXIK 1. Fig. 3 shows the maximum primary operate current at 50 - 60 Hz for RARIC, Version 1, at relay settings 0.5 and 1 mA as function of the inner diameter of the ILDD transformer.
  • Page 7 The filter in Version 2 rejects the fundamental voltage by more than 70:1. I = 1 mA I = 0,5 mA f (Hz) 0,04 30 50 100 150 502001-2 Fig. 4 Operate voltage of RARIC, Version 2 as function of frequency. Rated frequency = 50 Hz.

  • Page 8: Receiving, Storage And Installation

    4.3 Installation The RARIC protection can be placed in a 19" equipment frame for mount- ing in a 19" rack in a cubicle. The relay can also be placed in a relay case type RHGX.

  • Page 9: Setting, Testing And Commissioning

    Observe that for RARIC Version 2, rated frequency is 150 or 180 Hz. For this version, the relay shall not operate at lowest setting when 3 V rated frequency voltage is applied to relay terminals 107:231 - 241, (see Fig.

  • Page 10: Technical Data

    1MRK 502 001-UEN RARIC Page 10 Shaft current protection 7 TECHNICAL DATA Table 1: Basic data Current setting range (RXIK) 0.5-2 mA, 50-60 Hz Operate shaft current at setting 0.5 mA and transformer diameters Version 1: 0.3-0.8 A, 50-60 Hz 160-3000 mm Version 2: 0.3-0.8 A, 150 Hz...
  • Page 11 0,2/0,1 A at 220 V 7DEOH  Weights and dimensions Weight 4 kg RARIC , version 1 5 kg RARIC , version 2 10 + 80(D - 300) / 2300 kg ILDD where D is the inner diameter in mm...

  • Page 12: Diagrams

    RARIC Page 12 Shaft current protection 8 DIAGRAMS 7429010-AD Fig. 5 Circuit diagram 7429 010-AD for RARIC, RK 649 101-AD, Ver- sion 1, with AC/DC-converter RXTUB 2 101 107 113 119 126 127 128 RTXP 18 RXTUG 22H RXIK 1...
  • Page 13 RARIC 1MRK 502 001-UEN Shaft current protection Page 13 7429010-FC Fig. 7 Circuit diagram 7429 010-FC for RARIC, RK 649 101-FC, Ver- sion 2, with AC/DC-converter RXTUB 2. SHAFT CURRENT PROTECTION RARIC 107:31 107:41 TRIPPING ETC. 113:25 ALARM ETC. 107:16 7429 010-ADA Fig.
  • Page 14 Fig. 9 Terminal diagram 7429 010-BAA for RARIC, RK 649 101-BA, Version 1 SHAFT CURRENT PROTECTION RARIC 107:231 107:241 TRIPPING ETC. 125:25 ALARM ETC. 119:16 7429 010-FCA Fig. 10 Terminal diagram 7429 010-FCA for RARIC, RK 649 101-FC, Version 2...

  • Page 15: Dimension Ildd

    RARIC 1MRK 502 001-UEN Shaft current protection Page 15 9 DIMENSION ILDD Alt. 1 Alt. 2 en02000669.vsd Fig. 11 Dimensions of the shaft current transformer ILDD. The measur- ing windings of the two halves are interconnected via the termi- nals S. All dimensions are in mm.

  • Page 16: Mounting

    1MRK 502 001-UEN RARIC Page 16 Shaft current protection 10 MOUNTING Oil film Bearing housing Insulation Rotor Shaft current transformer ILDD RARIC Turbine en03000001.vsd Fig. 12 Recommended mounting of the shaft current transformer ILDD on hydro generators Shaft current transformer ILDD...
  • Page 17 RARIC 1MRK 502 001-UEN Shaft current protection Page 17 The transformer should be mounted with 4 supports. One of the alterna- tives 1, 2 or 3 can normally be used. Except the supporting bar all details are the same for all alternatives. Site weldings indicated for alternative 1 applies to all alternatives.

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