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Basler BE1-51/27R Instruction Manual

Time overcurrent relay with voltage restraint
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INSTRUCTION MANUAL
FOR
TIME OVERCURRENT RELAY
WITH VOLTAGE RESTRAINT
MODEL BE1-51/27R
Publication: 9 1372 00 999
Revision: B
09/99

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Summary of Contents for Basler BE1-51/27R

  • Page 1 INSTRUCTION MANUAL TIME OVERCURRENT RELAY WITH VOLTAGE RESTRAINT MODEL BE1-51/27R Publication: 9 1372 00 999 Revision: B 09/99...
  • Page 2 INTRODUCTION This Instruction Manual provides information concerning the operation and installation of BE1-51/27R Time Overcurrent (with voltage restraint) Relays. To accomplish this, the following is provided. Specifications Functional characteristics Installation Operational Tests Setting Examples W A R N I N G ! To avoid personal injury or equipment damage, only qualified personnel should perform the procedures presented in this manual.
  • Page 3 The availability and design of all features and options are subject to modification without notice. Should further information be required, contact Basler Electric Company, Highland, Illinois. BASLER ELECTRIC ROUTE 143, BOX 269 HIGHLAND, IL 62249 USA http://www.basler.com, info@basler.com...

  • Page 4: Table Of Contents

    General ..........4-1 BE1-51/27R - Introduction...
  • Page 5 Test Plug ..........6-1 BE1-51/27R - Introduction...

  • Page 6: Section 1 General Information

    SECTION 1 • GENERAL INFORMATION DESCRIPTION BE1-51/27R Time Overcurrent Relays with voltage restraint are microprocessor-based devices that provide voltage restraint of the phase time overcurrent function. With voltage restraint, the current pickup decreases proportionately with decreasing voltage over the rated voltage range. Instantaneous overcurrent element(s), when supplied, operate independently of the voltage restraint function.

  • Page 7: Residually Connected

    At voltages below 25 percent of nominal, the pickup will be 25 percent of the setting. Note that the BE1-51/27R is designed to trip at currents less than the setting if the voltage is depressed.
  • Page 8 5.00 20.00 0.111 0.154 0.188 0.231 0.316 0.400 0.526 Table 1-2. Timing, Curve B4, BE1-51/27R At 25% Voltage (20 to 99 Time Dial Settings) - Continued Multiple of Multiple of Time Dial Setting (Seconds) Setting Pickup 0.38 1.50 5.671 8.222 10.788...

  • Page 9: Standard Features

    Table 1-2. Timing, Curve B4, BE1-51/27R At 25% Voltage (20 to 99 Time Dial Settings) - Continued Multiple of Multiple of Time Dial Setting (Seconds) Setting Pickup 0.63 2.50 2.766 4.003 5.218 6.454 7.682 10.146 12.453 0.68 2.70 2.569 3.720 4.848...

  • Page 10: Non-Integrating Timing

    When the timer elapsed time exceeds the calculated time-out value, a time trip output signal is generated. This type of non-integrating time delay characteristic exhibits a dynamic characteristic that is immediately responsive to changes of the applied multiple of pickup current. BE1-51/27R - General Information...

  • Page 11: Integrating Timing

    0.3 to 2.4 amperes (phase) and 0.1 to 0.8 amperes (neutral) 0.3 to 2.4 amperes (phase and neutral) For all other units, two ranges are available. They are 0.5 to 12 amperes and 0.1 to 2.4 amperes. BE1-51/27R - General Information...

  • Page 12: Power Supply

    Use an extender card (Basler Electric part number: 9 1655 00 100) to test and troubleshoot the relay. An available test plug (Basler Electric part number: 10095 or G.E. part number 12XLA12A1) allows the relay to be tested in place without disturbing external control circuit wiring.

  • Page 13: Model And Style Number Description

    Style number identification chart (Figure 1-1) defines the electrical characteristics and operational features included in BE1-51/27R relays. For example, if the style number were U3E Z1P B1C1F, the device would have the following: 3-phase-and-neutral current;...
  • Page 14 Figure 1-1. Style Number Identification Chart BE1-51/27R - General Information...
  • Page 15 Chart 1-1. Instantaneous Response Time Time Delay Accuracy ±5% of the characteristic curve (Figures 1-2 through 1-70) for any com- bination of the front panel TIME DIAL setting and the front panel TAP/TAP CAL overcurrent pickup setting. 1-10 BE1-51/27R - General Information...
  • Page 16 144 MHz and 440 MHz, with the antenna located six inches from the relay in both horizontal and vertical planes. Surge Withstand Capability Qualified to ANSI/IEEE C37.90.1-1989 Standard Surge Withstand Ca- pability (SWC) Tests for Protective Relays and Relay Systems. BE1-51/27R - General Information 1-11...

  • Page 17: Time Overcurrent Characteristic Curves

    (11" X 17") characteristic curve chart on transparent paper (vellum). Publication 9 1372 00 897 contains 36 full size characteristic curve charts (timing options Z1 and Z2). To order any of these characteristic curve charts, contact Customer Service Department of the Power Systems Group, Basler Electric . 1-12...
  • Page 18 Figure 1-2. Timing Type B1: Short Inverse Figure 1-3. Timing Type B1: Short Inverse (Drawing No. 99-0932) With Extended Timing Range (Drawing No. 99-0944) BE1-51/27R - General Information 1-13...
  • Page 19 Figure 1-4. Timing Type B2: Long Inverse Figure 1-5. Timing Type B2: Long Inverse (Drawing No. 99-0931) With Extended Timing Range. (Drawing No. 99-0946) 1-14 BE1-51/27R - General Information...
  • Page 20 Figure 1-6. Timing Type B3: Definite Time Figure 1-7. Timing Type B3: Definite Time (Drawing No. 99-0933) With Extended Timing Range (Drawing No. 99-0942) BE1-51/27R - General Information 1-15...
  • Page 21 Figure 1-8. Timing Type B4: Figure 1-9. Timing Type B4: Moderately Moderately Inverse Inverse With Extended Timing Range (Drawing No. 99-0930) (Drawing No. 99-0945) 1-16 BE1-51/27R - General Information...
  • Page 22 Figure 1-10. Timing Type B5: Inverse Figure 1-11. Timing Type B5: Inverse (Drawing No. 99-0929) With Extended Timing Range (Drawing No. 99-0943) BE1-51/27R - General Information 1-17...
  • Page 23 Figure 1-12. Timing Type B6: Very Inverse Figure 1-13. Timing Type B6: Very Inverse (Drawing No. 99-0928) With Extended Timing Range (Drawing No. 99-0941) 1-18 BE1-51/27R - General Information...
  • Page 24 Figure 1-14. Timing Type B7: Extremely Figure 1-15. Timing Type B7: Extremely Inverse Inverse With Extended Timing Range (Drawing No. 99-0927) (Drawing No. 99-0940) BE1-51/27R - General Information 1-19...
  • Page 25 Figure 1-16. Timing Type B8: I Figure 1-17. Timing Type B8: I (Drawing No. 99-0926) With Extended Timing Range (Drawing No. 99-0947) 1-20 BE1-51/27R - General Information...
  • Page 26 Figure 1-18. Timing Type C1: I Figure 1-19. Timing Type C1: I T With Limit With Limit #1 #1 and Extended Timing Range (Drawing No. 99-0956) (Drawing No. 99-0948) BE1-51/27R - General Information 1-21...
  • Page 27 Figure 1-20. Timing Type C2: I Figure 1-21. Timing Type C2: I T With Limit With Limit #2 #2 and Extended Timing Range (Drawing No. 99-0957) (Drawing No. 99-0949) 1-22 BE1-51/27R - General Information...
  • Page 28 Figure 1-22. Timing Type C3: I Figure 1-23. Timing Type C3: I T With Limit With Limit #3 #3 and Extended Timing Range (Drawing No. 99-0958) (Drawing No. 99-0950) BE1-51/27R - General Information 1-23...
  • Page 29 Figure 1-24. Timing Type C4: I Figure 1-25. Timing Type C4: I T With Limit With Limit #4 #4 and Extended Timing Range (Drawing No. 99-0959) (Drawing No. 99-0951) 1-24 BE1-51/27R - General Information...
  • Page 30 Figure 1-26. Timing Type C5: I Figure 1-27. Timing Type C5: I T With Limit With Limit #5 #5 and Extended Timing Range (Drawing No. 99-0960) (Drawing No. 99-0952) BE1-51/27R - General Information 1-25...
  • Page 31 Figure 1-28. Timing Type C6: I Figure 1-29. Timing Type C6E: With Limit #6 T With Limit #6 and (Drawing No. 99-0961) Extended Timing Range (Drawing No. 99-0953) 1-26 BE1-51/27R - General Information...
  • Page 32 Figure 1-30. Timing Type C7: Figure 1-31. Timing Type C7E: T With Limit #7 T With Limit #7 and (Drawing No. 99-0962) Extended Timing Range (Drawing No. 99-0954) BE1-51/27R - General Information 1-27...
  • Page 33 Figure 1-32. Timing Type C8: Figure 1-33. Timing Type C8E: T With Limit #8 T With Limit #8 and (Drawing No. 99-0963) Extended Timing Range (Drawing No. 99-0955) 1-28 BE1-51/27R - General Information...
  • Page 34 Figure 1-34. Timing Type E2: Figure 1-35. Timing Type E4: BS 142 Long Inverse BS 142 Inverse (1.3 Sec) (Drawing No. 99-1093) (Drawing No. 99-1094) BE1-51/27R - General Information 1-29...
  • Page 35 Figure 1-36. Timing Type E5: Figure 1-37. Timing Type E6: BS 142 Inverse (2.9 Sec) BS 142 Very Inverse (Drawing No. 99-1095) (Drawing No. 99-1096) 1-30 BE1-51/27R - General Information...
  • Page 36 Figure 1-38. Timing Type E7: BS 142 Extremely Inverse (Drawing No. 99-1097) BE1-51/27R - General Information 1-31...
  • Page 37 Figure 1-40. Timing Type B1: Short Inverse Figure 1-39 . Timing Type B1: Short Inverse With Integrated Algorithm and With Integrated Algorithm Extended Timing (Drawing No. 99-1397) (Drawing No. 99-1398) 1-32 BE1-51/27R - General Information...
  • Page 38 Figure 1-41. Timing Type B2: Long Inverse Figure 1-42. Timing Type B2: Long Inverse With Integrated Algorithm With Integrated Algorithm and (Drawing No. 99-1399) Extended Timing (Drawing No. 99-1400) BE1-51/27R - General Information 1-33...
  • Page 39 Figure 1-43. Timing Type B3: Definite Time Figure 1-44. Timing Type B3: Definite Time With Integrated Algorithm With Integrated Algorithm and (Drawing No. 99-1401) Extended Timing (Drawing No. 99-1402) 1-34 BE1-51/27R - General Information...
  • Page 40 Figure 1-45. Timing Type B4: Moderately Inverse With Figure 1-46. Timing Type B4: Moderately Integrated Algorithm Inverse With Integrated Algorithm (Drawing No. 99-1403) and Extended Timing (Drawing No. 99-1404) BE1-51/27R - General Information 1-35...
  • Page 41 Figure 1-47 . Timing Type B5: Inverse With Integrated Algorithm Figure 1-48. Timing Type B5: Inverse (Drawing No. 99-1405) With Integrated Algorithm and Extended Timing (Drawing No. 99-1406) 1-36 BE1-51/27R - General Information...
  • Page 42 Figure 1-49. Timing Type B6: Very Inverse With Integrated Algorithm Figure 1-50. Timing Type B6: Very Inverse (Drawing No. 99-1407) With Integrated Algorithm and Extended Timing (Drawing No. 99-1408) BE1-51/27R - General Information 1-37...
  • Page 43 Figure 1-51. Timing Type B7: Extremely Inverse Figure 1-52. Timing Type B7E: Extremely Inverse With Integrated Algorithm With Integrated Algorithm and (Drawing No. 99-1409) Extended Timing (Drawing No. 99-1410) 1-38 BE1-51/27R - General Information...
  • Page 44 Figure 1-53. Timing Type B8: I Figure 1-54. Timing Type B8E: I With Integrated Algorithm With Integrated Algorithm (Drawing No. 99-1411) and Extended Timing (Drawing No. 99-1412) BE1-51/27R - General Information 1-39...
  • Page 45 Figure 1-55. Timing Type C1: I T, Limit # 1 Figure 1-56. Timing Type C1E: I T, Limit # 1 With Integrated Algorithm With Integrated Algorithm and (Drawing No. 99-1413) Extended Timing (Drawing No. 99-1414) 1-40 BE1-51/27R - General Information...
  • Page 46 Figure 1-57. Timing Type C2: I T, Limit # 2 Figure 1-58. Timing Type C2E: I T, Limit # 2 With Integrated Algorithm With Integrated Algorithm and (Drawing No. 99-1415) Extended Timing (Drawing No. 99-1416) BE1-51/27R - General Information 1-41...
  • Page 47 Figure 1-59. Timing Type C3: I T, Limit # 3 Figure 1-60. Timing Type C3E: I T, Limit # 3 With Integrated Algorithm With Integrated Algorithm and (Drawing No. 99-1417) Extended Timing (Drawing No. 99-1418) 1-42 BE1-51/27R - General Information...
  • Page 48 Figure 1-61. Timing Type C4: Figure 1-62. Timing Type C4E: I T, Limit # 4 With Limit # 4 With Integrated Algorithm Integrated Algorithm and Extended Timing (Drawing No. 99-1419) (Drawing No. 99-1420) BE1-51/27R - General Information 1-43...
  • Page 49 Figure 1-63 . Timing Type C5: I Figure 1-64. Timing Type C5E: I Limit # 5 With Integrated Algorithm Limit # 5 With Integrated Algorithm and (Drawing No. 99-1421) Extended Timing (Drawing No. 99-1422) 1-44 BE1-51/27R - General Information...
  • Page 50 Figure 1-65. Timing Type C6: I T, Limit # 6 Figure 1-66. Timing Type C6E: I T, Limit # 6 With Integrated Algorithm With Integrated Algorithm and (Drawing No. 99-1423) Extended Timing (Drawing No. 99-1424) BE1-51/27R - General Information 1-45...
  • Page 51 Figure 1-67. Timing Type C7: I T, Limit # 7 Figure 1-68. Timing Type C7E: I T, Limit # 7 With Integrated Algorithm With Integrated Algorithm and (Drawing No. 99-1425) Extended Timing (Drawing No. 99-1426) 1-46 BE1-51/27R - General Information...
  • Page 52 Figure 1-69. Timing Type C8: I T, Limit # 8 Figure 1-70. Timing Type C8E: I T, Limit # 8 With Integrated Algorithm With Integrated Algorithm (Drawing No. 99-1427) and Extended Timing (Drawing No. 99-1428) BE1-51/27R - General Information 1-47...

  • Page 53: Section 2 Human Machine Interface (Controls And Indicators)

    SECTION 2 • HUMAN MACHINE INTERFACE (Controls And Indicators) GENERAL Table 2-1 lists and briefly describes the human machine interface (HMI) of the BE1-51/27R Time Overcurrent Relay with voltage restraint. Reference the call-out letters to Figure 2-1. Table 2-1. Controls and Indicators...
  • Page 54 Figure 2-1. Location of Controls and Indicators BE1-51/27R - Human Machine Interface (Controls And Indicators)
  • Page 55 ** This Instantaneous overcurrent sensing circuit detects levels that are multiples of the level selected for the time overcurrent sensing circuit. Any change of the tap selector or calibration (CAL) controls will cause a directly proportional change of the instantaneous overcurrent Levels. BE1-51/27R - Human Machine Interface (Controls And Indicators)
  • Page 56 0.60 0.65 0.75 0.80 ----- ----- ----- NOTE: † For relays with sensing input range 1, connect the system wiring to the current sensing terminals for the desired range (HIGH or LOW). BE1-51/27R - Human Machine Interface (Controls And Indicators)
  • Page 57 Number of Targets Installed Sensing Instantaneous Elements (Types A and B) Input Element Function Type None TIME INST 1 INST 2 M, N R, S U, W B, C E, F Y, Z BE1-51/27R - Human Machine Interface (Controls And Indicators)

  • Page 58: Block Diagram Analysis

    3-2) processes signals, performs logic functions, and all of the time overcurrent computations. POWER SUPPLY Basler Electric enhanced the power supply design for unit case relays. This new design created three, wide range power supplies that replace the five previous power supplies. Style number identifiers for these power supplies have not been changed so that customers may order the same style numbers that they ordered previously.
  • Page 59 Figure 3-1. Functional Block Diagram BE1-51/27R - Functional Description...

  • Page 60: Voltage Sensing

    This shifts the time delay characteristic to the right on the multiples-of- pickup-current axis (characteristic curves) as voltage drops from 100 percent to 25 percent. To find the effective multiple-of-pickup-current point on the axis, use Formula 1. Formula 1 × BE1-51/27R - Functional Description...

  • Page 61: Microprocessor

    Power supply status output relays have a set of normally closed contacts that are energized open during power-up. If either or both power supply output legs (+12 Vdc or -12 Vdc) fails, the power supply status output relay is de-energized and the output contacts close. Shorting bars across the output contacts are BE1-51/27R - Functional Description...

  • Page 62: Target Indicator Circuits

    Each target, when operated, is magnetically latched and must be reset manually. Target configurations for the various models are provided in Section 2. BE1-51/27R - Functional Description...

  • Page 63: Section 4 Installation

    If there is evidence of damage, immediately file a claim with the carrier and notify the Regional Sales Office, or contact the Sales Representative at Basler Electric, Highland, Illinois. In the event the relay is not to be installed immediately, store the relay in its original shipping carton in a moisture and dust free environment.
  • Page 64 2 plugs for 20-terminal cases). Removal of the connection plug(s) opens the N.O. trip contact circuits and shorts the N.C. trip contact circuits before opening the power and Sensing Circuits. Figure 4-1. Typical External Connections, Current Operated Targets, DC Powered BE1-51/27R - Installation...
  • Page 65 Figure 4-2. Typical Sensing External Connections, Sensing Input Type M or N Figure 4-3. Typical Sensing External Connections, Sensing Input Type R or S BE1-51/27R - Installation...
  • Page 66 Figure 4-4. Typical Sensing External Connections, Sensing Input Type U or W Figure 4-5. Typical Sensing External Connections, Sensing Input Type B or C BE1-51/27R - Installation...
  • Page 67 Figure 4-6. Typical Sensing External Connections, Sensing Input Type E or F Figure 4-7. Typical Sensing External Connections, Sensing Input Type Y or Z BE1-51/27R - Installation...

  • Page 68: Power Supply

    POWER SUPPLY Basler Electric enhanced the power supply design for unit case relays. This new design created three, wide range power supplies that replace the five previous power supplies. Style number identifiers for these power supplies have not been changed so that customers may order the same style numbers that they ordered previously.
  • Page 69 Figure 4-8. Typical Internal Diagram, Sensing Input Type M or N BE1-51/27R - Installation...
  • Page 70 Figure 4-9. Typical Internal Diagram, Sensing Input Type Y or Z With Power Supply Status BE1-51/27R - Installation...
  • Page 71 Figure 4-10. Typical Internal Diagram, Sensing Input Type B or C With Power Supply Status BE1-51/27R - Installation...
  • Page 72 Figure 4-11. Typical Internal Diagram, Sensing Input Type R or S With Power Supply Status 4-10 BE1-51/27R - Installation...
  • Page 73 Figure 4-12. Typical Internal Diagram, Sensing Input Type E or F With Power Supply Status BE1-51/27R - Installation 4-11...
  • Page 74 Figure 4-13. Typical Internal Diagram, Sensing Input Type U or W With Power Supply Status 4-12 BE1-51/27R - Installation...

  • Page 75: Setting The Relay

    25 percent of nominal and the relay is slower than if pickup current was fixed at 25 percent. Assuming a fixed 25 percent pickup simplifies calculations and provides an added safety margin because the BE1-51/27R relay is the last step in the coordination for an external fault.
  • Page 76 Figure 4-14. Relay Signals and Current Pickup Example For 3-Phase Fault (X = 0.65 X" 4-14 BE1-51/27R - Installation...

  • Page 77: Setting Example

    51/27R Time Overcurrent Relay with voltage restraint, BE1-51 Time Overcurrent Relay, and BE1-67 Phase Directional Overcurrent Relay. Generator Backup BE1-51/27R (51/27), relay style number, U3E B6S B2C0F (Breaker A) 3-phase and neutral overcurrent 1.5 to 12A phase (instantaneous trip is out of service) 0.5 to 4A neutral (instantaneous is in service)
  • Page 78 Steady state Figure 4-16. Setting Example Downstream current in Table 4-1 is the current in the downstream relay with which the BE1-51/27R elements must coordinate. The currents are the changes resulting from the fault assuming a driving point voltage of 11 kV.

  • Page 79: Coordination With Feeder Relay 51 For Fault 1

    Multiples of pickup in the 51 relay at steady state level are: ×6 51/27 time at 6.2 multiples: 0.36 seconds . 1.5 51/27 multiples at 129 A: 1.4 × 51/27 time at 1.5 multiples: 9.0 seconds . BE1-51/27R - Installation 4-17...

  • Page 80: Checking Coordination With Relay 67 For Fault 2

    0.85 power factor, the superposition of this current and the fault current at minus 90 degrees yields a total current of 831 amperes at the transient level and 282 amperes at the steady state level with no regulator boosting. The relays are selective down to about 350 amperes. 4-18 BE1-51/27R - Installation...
  • Page 81 Use of a breaker failure timer set at 0.25 seconds would avoid generator tripping for failure of breaker R to interrupt. NOTE 1: 194 a @ -31.8 (3700 kVA @ 0.87 Power Factor) Pre-Fault Load Superimposed Figure 4-17. Relay 51/27R Coordination With 67 Relay for Fault 3 In Figure 4-16 BE1-51/27R - Installation 4-19...

  • Page 82: Neutral Element Backup Settings

    Neutral Element Back-up Settings Because the generators are ungrounded, the 51N element of the BE1-51/27R relay has no relays to coordinate with. An instantaneous element, if used, must be set above the maximum false residual current that can be developed due to dissimilar CT saturation during an external three-phase fault. In a like manner, the time setting of the time overcurrent element must ride through this transient resulting from CT saturation.
  • Page 83 Figure 4-18. Panel Drilling Diagram, Semi-Flush Mounting Figure 4-19. Outline Dimensions, Semi-Flush Mounting BE1-51/27R - Installation 4-21...
  • Page 84 Figure 4-20. Panel Drilling Diagram, Projection Mounting, Rear View PANEL CASE DETAIL A-A SHOWING THE ADDITION OF WASHERS OVER THE BOSS TO TIGHTEN THE RELAY AGAINST THE PANEL. D2851-19.vsd 09-02-99 Figure 4-21. Outline Dimensions, Projection Mounting 4-22 BE1-51/27R - Installation...

  • Page 85: Section 5 Tests And Adjustments

    Relay. For all three-phase relays, the test signals must connect to both the current and voltage terminals for the same phase. Ensure that the timed output terminals 1 and 10 are connected. BE1-51/27R - Tests And Adjustments...
  • Page 86 Step 4. Adjust the front panel INST 1 and INST 2 controls, if present, fully clockwise (CW). Step 5. Adjust the front panel TAP CAL control, and if present, the front panel TAP (NEUTRAL) control fully CW. Figure 5-1. Test Setup for Sensing Input Type M or N (Single-Phase Sensing) BE1-51/27R - Tests And Adjustments...
  • Page 87 Figure 5-2. Test Setup for Sensing Input Type R or S (Three-Phase Sensing) Figure 5-3. Test Setup for Sensing Input Type U or W (Three-Phase with Neutral Sensing) BE1-51/27R - Tests And Adjustments...
  • Page 88 Figure 5-4. Test Setup for Sensing Input Type B or C (Three-Phase, Delta Configuration) Figure 5-5. Test Setup for Sensing Input Type E or F (Three-Phase with Neutral Sensing) BE1-51/27R - Tests And Adjustments...

  • Page 89: Time Overcurrent Pickup Test

    Step 5. Adjust the front panel TAP CAL control fully CW to allow measurement of the actual overcurrent pickup point at the A setting of the front panel TAP selector. Note that the front panel TIMING Indicator will extinguish. Do not disturb this setting. BE1-51/27R - Tests And Adjustments...
  • Page 90 Step 15. Slowly adjust the front panel CAL (NEUTRAL) control CCW until the front panel TIMING indicator illuminates. RESULT: For the neutral minimum overcurrent pickup point of 0.5 A (Step 16a., above) or 1.5 A (Step 16b., above) the front panel CAL (NEUTRAL) control should be near its maximum CCW limit. BE1-51/27R - Tests And Adjustments...

  • Page 91: Timed Output Test

    The test setup timer stops. (Record count for use in Step 9.) If target type A or B is present: The front panel FUNCTION-TIME target (if present) trips. The appropriate front panel ELEMENT target A, B, or C (if pres- ent) trips. BE1-51/27R - Tests And Adjustments...
  • Page 92 If target Type A or B is present: Front panel FUNCTION-TIME target (if present) trips. Appropriate front panel ELEMENT target A, B, or C (if present) trips. Step 19. Remove input current and (if present) reset the relay front panel targets. BE1-51/27R - Tests And Adjustments...

  • Page 93: Instantaneous Overcurrent Pickup Test

    Step 7. Reset the relay front panel targets (if present). Step 8. Turn the front panel INST 1 control fully CW to establish a pickup point of 40 times the front panel TAP selector A setting. BE1-51/27R - Tests And Adjustments...

  • Page 94: Voltage Restraint Test

    Step 4. Slowly increase the input current from 0 until the appropriate phase timing indicator just illuminates. RESULT: The overcurrent pickup point should be 100 ±5% of the front panel setting. Step 5. Apply 50% of nominal voltage based on the sensing input type for your relay. 5-10 BE1-51/27R - Tests And Adjustments...

  • Page 95: Adjustment Of Controls For Relay Operation

    For adjustment of the front panel TAP (NEUTRAL) selector, the relay is re-connected for neutral sensing by this procedure. BE1-51/27R - Tests And Adjustments 5-11...

  • Page 96: Time Overcurrent Curve Selection (Timing Type Z1, Z2, And Z3)

    Pickup point calibration ends here. Time Overcurrent Curve Selection (Timing Type Z1, Z2, and Z3 Only) Step 1. Remove the relay case front cover to gain access to the logic board time overcurrent characteristic curve selector. 5-12 BE1-51/27R - Tests And Adjustments...

  • Page 97: Time Delay Selection

    On the appropriate curve, plot upward from the multiples-of-pickup-current value until the horizontal line opposite the desired time delay ( time-in-seconds ) is reached. The setting curve nearest the plot point should then be entered on the front panel NEUTRAL TIME DELAY. BE1-51/27R - Tests And Adjustments 5-13...

  • Page 98: Inst 1 Control Setting

    For relays with two-phase-and-neutral or three-phase-and-neutral sensing (sensing input types E, F, U, W, Y, or Z), perform Steps 9 through 14. Step 9. Reconnect the output to the neutral current sense terminals. See Figures 5-3, 5-5, or 5-6. 5-14 BE1-51/27R - Tests And Adjustments...

  • Page 99: Inst 2 Control Setting

    For this adjustment, repeat INST 1 control setting, but substitute instantaneous 2 output terminals (11 and 12) and the front panel INST 2 controls. Because neutral sensing does not apply to this pickup point, ignore Steps 9 through 15. BE1-51/27R - Tests And Adjustments 5-15...

  • Page 100: Section 6 Maintenance

    TEST PLUG Test plugs (Basler part number 10095 or G.E. part number XLA12A1) provide a quick, easy method of testing relays without removing them from their case. Test plugs are simply substituted for the connection plugs.
  • Page 101 1 through 10 facing up. Similarly, when using the test plug in the upper part of the relay, the numbers 11 through 20 are faceup. It is impossible, due to the construction of the test plug, to insert it with the wrong orientation. BE1-51/27R - Maintenance...
  • Page 102 09-22-93 00 990 into individual instruction manuals. Those manuals are: BE1-51, 9 1372 00 997; BE1-51/27C, 9 1372 00 998; and BE1-51/27R, 9 1372 00 999. Enhanced the description of the B and C curves in Section 1. 15096 05-12-95 Changed Specifications : Time Overcurrent Pickup Accuracy;...

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