GE IBCG51M A Series Instructions Manual
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GE IBCG51M A Series Instructions Manual

GE IBCG51M A Series Instructions Manual

Ground directional overcurrent relays
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Supersedes
GROUND
DIRECTIONAL
OVERCURRENT
RELAYS
TYPES
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Summary of Contents for GE IBCG51M A Series

  • Page 1 Supersedes GROUND DIRECTIONAL OVERCURRENT RELAYS TYPES...

  • Page 2: Table Of Contents

    GEK-49822 CONTENTS PAGE DIRECTIONAL UNIT .... 17 DESCRIPTION ..... . . CURRENT POLARIZATION ..17 APPLICATION ......

  • Page 3: Description

    GROUND DIRECTIONAL OVERCURRENT RELAYS DESCRIPTION The Type relays are ground directional overcurrent relays used primarily for IBCG They are available with either the protection of feeders and transmission lines. inverse, very inverse or extremely inverse time characteristics. All the relays contain a time overcurrent unit of the induction disk type and IBCG an instantaneous directional unit of the induction cup type.

  • Page 4: Application

    GEK-49822 EXTENDED RANGE RELAYS IBCG Pickup Range Relay Time Inst Conn. Characteristic Unit Inst. Time 2-16 Inverse 0 5 4 Inverse 0.5-4, 2-16 Fig. 6 Inverse 6-150 Fig. 5 Very Inverse Fig. 7 Very Inverse Fig. 6 Very Inverse 1.5-12 Fig.
  • Page 5 selective action of two or more relays is required, determine the maximum possible short-circuit current of the line and then choose a time value for each relay that circuit breakers. Allowance must be made for the time involved in opening each breaker after the relay contacts close.

  • Page 6: Time Overcurrent Unit

    OVERCURRENT TIME, UNIT The one second ratings of the TOC units are given In Table 2. The continuous ratlngs for the vartous taps of each model and current range are glven in Tables 3. 4 and 5. TABLE 3 RATING OF 0.5-4.0 AMP TOC UNITS CONTINUOUS mp Range Model...

  • Page 7: Directional Unit

    TABLE 5 CONTINUOUS RATING OF 2-16.0 AMP TOC UNITS 2-16.0 Amp Range Model 3.0 4.0 10.0 12.0 16.0 Rating 9.0 10.0 12.0 14.0 15.0 16.0 17.5 20.0 20.0 20.0 9.5 10.5 11.5 12.5 14.0 15.5 17.0 18.0 19.0 20.0 20.0 DIRECTIONAL UNIT The directional unit current polarizing and operating coils have a continuous rating of five amperes and a one second rating of 150 amperes.

  • Page 8: Target And Seal-In Unit

    GEK-49822 SEAL in Table 7. The tap setting used will depend on the current drawn by the The 0.2 ampere tap is for use with trip coils which operate on currents ranging frcm If this tap is used with trip 0.2 up to 2.0 amperes, at the minimum control voltage.

  • Page 9: Operating Time

    The current required to close the time overcurrent unit contacts will be within five percent of the tap screw setting. RESET (TIME OVERCURRENT UNIT) time overcurrent units reset at 90 percent of the minimum pickup current, Inverse very inverse time units at 80 percent, and extremely inverse time units at 85 percent. When the relay is de-energized, the time required for the disk to canpletely reset to the number ID time dial position is approximately six seconds for inverse time relays, and 60 seconds for very inverse time and extremely inverse time relays.
  • Page 10 GEK-49922 TABLE 9 CURRENT BURDENS AT 60 CYCLES OF THE TDC UNIT CIRCUIT Burdens at Minimum Pickup 3 Times 10 Times At Five Time Range Eff. Res. React. **Imped +Volt Amps P.F. Min P.U. Min P.U. Amperes Characteristic (Ohms) (Ohms) (Amps) (Ohms) 5.60 21.0...

  • Page 11: Directional Unit

    CONSTRUCTION The IBCG relays consist of two units, a time overcurrent unit (top) of the induction disk type, and an instantaneous power directional unit (bottom) of the induction cup type. The directional unit is either potential or current polarized or both and, by means of its closing contacts, directionally controls the operation of the time overcurrent unit.

  • Page 12: Target Seal-In Unit

    GEK-49822 the upper portion of the lron that used in watthour meters except as follows: structure has two concentric windings on the middle leg of the magnetic circuit. of these is a tapped current winding connected to taps on the tap block; the other iS a floating winding which is connected in series with the directional unit.

  • Page 13: Acceptance Tests

    ACCEPTANCE TESTS made to ensure that no damage has been sustained in shipment and that the relay If the examination or the test indicates that calibrations have not been disturbed. readjustment is necessary, refer to the section on SERVICING. These tests may be performed as part of the installation or the discretion of the user.

  • Page 14: Drawout Relays, General

    GEK-49822 Since all drawout relays in service operate in their cases, it is recommended that they be tested In their cases or an equivalent steel case. In this way, any ma_gnetic effects of the enclosure will be accurately duplicated during testing. A relay may be This plug tested without removing it from the panel by using a 12XLA13A test plug.

  • Page 15: Time Overcurrent Unit

    GEK-49822 TABLE TARGET AND SEAL-IN UNIT OPERATING CURRENTS PICKUP DROPOUT CURRENT CURRENT 0.115 0.05 OR MORE 0.55 OR MORE 1.15 TIME OVERCURRENT UNIT Rotate the time dial slowly and check by means of a lamp that the contacts just close at the zero time dial setting.

  • Page 16: Time Setting

    GEK-49822 never be because of the insufficient range of the variable resistor, it should notch) necessary to wind up the control spring adjuster more than 30 degrees (one unwind it more than 90 degrees (three notches) from the factory Test connections for making pickup and time checks on the time over-current unit are Use a source of 120 volts or greater with good wave form and shown in Fig.

  • Page 17: Directional Unit

    6EK-49822 Current Polarization a. Connect per Fig. 24 of TEST CONNECTIONS. coil if applied too frequently or for too long a period of time. Potential Polarization a. Connect per Fig. 25 of TEST CONNECTIONS. b..With V set for five volts at terminals 9 to 10, the unit should close its contacts between 0.75-1.75 amps.

  • Page 18: Operation

    GEK-49822 CONNECTIONS The internal connection diagrams for the various relays are shown in Fig. 5 to 9. Typical external wiring diagrams are shown by Fig. 10, 11 and 12. Unless mounted on a steel panel which adequately grounds the relay case, it is recommended that the case be grounded through a mounting stud or screw with a conductor not less than #12 B&S gage copper wire or its equivalent.

  • Page 19: Directional Unit

    DIRECTIONAL UWIT Current Polarization b. Adjust the control spring for 0.5 amperes pickup if current polarized or dual polarized. Potential Polarization TEST CONNECTIONS. c. If potential polarized, connect-per Fig. 25 of ( 210 percent). Ten volts and 0.36 INSTANTANEOUS UNIT 1.

  • Page 20: Instantaneous Unit

    GEK-49822 INSTANTANEOUS UNIT Check that the instantaneous unit picks up at the desired current level, as outlined in the ACCEPTANCE TESTS and the INSTALLATION TEST sections. SERVICING These relays are adjusted at the factory and it is advisable not to disturb the adjustments.

  • Page 21: Directional Unit

    On IBC877/78 relays, set the relay on the amp tap with the time dial set so that Adjust pickup within the limits 1.96 to 2.84 but as the contacts are just open. close as possible to 2.0 aolps. Then movethetilne dial to the No. 10 position and check the current required to just move the disk away fran the stop arm.

  • Page 22: Bias Torque Adjustment

    GEK-49822 Loosen the locknut which secures the backstop screw (located at the right hand Unwind the backstop screw so that the moving corner of the unit) to its support. Adjust the tension of each low gradient contact arm is permitted to swing freely. contact brush so that one-to-two grams of pressure are required at the contact tip.in order to cause the end of the brush to separate from the inner face of its brush retainer.

  • Page 23: Instantaneous Unit

    'in the range of 5 to 25 amperes. A screw projecting from the side of the moving contact Use rated frequency and current in phase with the arm controls the clutch pressure. voltage. With suddenly applied current, adjust the clutch so that it will not slip at ten amperes or less, but will slip at or above 15 amperes.
  • Page 24 GEK-49822 Fig. 1 (8043458) Type IBCGHM(-)YlA or the 18CG53M(- in its Case (Front View) *Indicates Revision...
  • Page 25 GEK-49822 T O C T O C B L O C K S C R E W MOVING CONTACT T O C T O C PICKUP ADJUSTING INSTANTANEOUS TARGET/SEAL-IN TOC DISK LOCKING S C R E W PICKUP ADJUSTING LOCKING SCREW RING CLUTCH...
  • Page 26 GEK-49822 DISK - Fig. 3 (8043460) Type IBCG51M(-)YlA or the IBCG53M(-)YlA Relay Removed from Case (Rear View) *Indicates Revision...
  • Page 27 GEK-49822 T O C Type IBCG77M or IBCG78M Relay Removed Fig. 4 (8043461) from Case (Rear View) *Indicates Revision...
  • Page 28 THY RITE POT. T O C TOC = TIME OVERCURRENT UNIT Internal Connections for IBCGSlM and Fig. 5 (0269A3061-0)
  • Page 29 T O C SHADING COILS T O C POT. INSTANTANEOUS UNIT TOC = TIME OVERCUkRENT UNIT Fig. 6 (02691\3062-0) Internal Connections for IBCGSlM(-)YlA and...
  • Page 30 6 E K - 4 9 8 2 2 POT. FOL. S I -SEAL IN 1 NIT Fig. 7 (02X%9194-0) Internal Connections Diagram for the *Indicates Revision...
  • Page 31 GEK-49822 T O C : cz FOL. SI = SEAL-IN UNIT TOC = TIME OVERCUKRENT UNIT D = DIRECTIONAL UNIT Fig. 8 (026gA3063-0) Internal Connections for IBCG77M Relay (Front View)
  • Page 32 SI=SEAL-IN UNIT C&DIRECTIONAL UNIT Fig. 9 (0127A9424-0) Internal Connections Diagram for the *Indicates Revision...
  • Page 33 GM-49822 IF POTENTIAL POLARIZATION D-DIRECTIONAL UNIT Fig. 10 (0273AgO51-0) Typical External Connections Diagram for Relay Types IBCGSlM, 53M or 77M...
  • Page 34 PHASE SEOUENCE l-2-3 OR 3-2-l P H A S E R E L A Y S SEE NOTE I NOTES: CONNECT ATOD AND BTDC. IF POTENTIAL SEE NOTE 2 POLARIZATION IS NOT USED CONNECT CTOD 2. IF CURRENT POLARHATION IS NOT USED CONNECT STUDS D-DIRECTIONAL UNIT...
  • Page 35 IF POTENTIAL ~OG~hI::~T:CII I F CIIEWT POLBRIZATION IS NUT USED, DO NOT Fig. 12 (275A4559-0) External Diagram for the IBCG52M, 54M and the 7BM Relays *Indicates Revision...
  • Page 37 6EK-49822 Fig. 14 (0376A0934-0) Time Characteristic of Dual Polarized Directional Unit of Type IBCG Relay...
  • Page 38 W - 4 9 8 2 2 Fig. 15 (088880269-3) Time-current Characteristic of Inverse Time Overcurrent Unit...
  • Page 39 6EK-49822 MULTIPLES OF RELAY TAP SETTING Fig. 16 (0888B0270-3) Time-current Characterisitc of Very Inverse Time Overcurrent Unit...
  • Page 40 6u-49822 M U L T I P L E S O F E L A Y Fig. 17 (0888802746) Time-current Characteristic of Extremely Time Overcurrent Unit Inverse...
  • Page 41 Fig. 18 (0208A8695-1) Time-current Characteristics of the Hi-Seismic Instantaneous Unit...
  • Page 42 Fig.. 19 (0208A8694-2) Transient Overreach Characteristics of the Hi-Seismic Instantaneous Unit...
  • Page 43 A - contact Of.31 K - Stationary Contact Support B - Stationary Contact Brush c - Contact Tip L - Mounting Screw M - Locknuts F - Button Contact Tip G - Moving Contact Brush Retainer E - Moving Contact:Brush Fig.
  • Page 44 Fig. 21 (8025039) Cross Section of Drawout Case Showing Position of Auxiliary Brush...
  • Page 45 GEK-49822 Fig. 22 (D195A9179-0) Test Connections for Checking Pickup of TDC Unit...
  • Page 46 6EK-49822 1 ___q5 O RATED . . . - : Fig. Test Connections for Checking 23 (01951\9180-0) Operating Time of TDC Unit...
  • Page 47 m - 4 9 8 2 2 PLUG TEST Fig. 24 Test Connections for Checking Pickup of Directional Unit using Current Polarization...
  • Page 48 Fig. Test Connections for Checking Pickup of 25 (0195A9182-0) Directional Unit using Potential Polarization...
  • Page 49 PANEL LOCATION NUMBERING OF STUDS VIEW SHOWING ASSEMBLY OF HARD- WARE F(X SURFACE PANEL DRLLIN6 FOR E L S PANEL SEMI FLUSH MOUNTING SURFACE MOUNTING (FRONT VIEW) ( F R O N T V I E W ) Fig. 26 (K-6209273-4) Outline and Panel Drilling Dimensions for Type IBCG Relays...

This manual is also suitable for:

Ibcg52m a seriesIbcg51m y1a seriesIbcg53m a seriesIbcg54m a seriesIbcg53m y1a seriesIbcg77m a series ... Show all

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