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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
BE1-51/27R
Publication: 9137200999
Revision: D
07/10

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  • Page 1 INSTRUCTION MANUAL TIME OVERCURRENT RELAY WITH VOLTAGE RESTRAINT BE1-51/27R Publication: 9137200999 Revision: D 07/10...
  • Page 3 INTRODUCTION This instruction manual provides information about the operation and installation of the BE1-51/27R Time Overcurrent Relay with Voltage Restraint. To accomplish this, the following information is provided:  General Information and Specifications  Controls and Indicators  Functional Description ...
  • Page 4 July 2010 CONFIDENTIAL INFORMATION of Basler Electric, Highland Illinois, USA. It is loaned for confidential use, subject to return on request, and with the mutual understanding that it will not be used in any manner detrimental to the interest of Basler Electric.
  • Page 5 REVISION HISTORY The following information provides a historical summary of the changes made to the BE1-51/27R instruction manual (9137200999). Revisions are listed in reverse chronological order. Manual Revision and Date Change  D, 07/10 Replaced cover drawing and Figure 2-1. (New front panel switches and graphics.)
  • Page 6 This page intentionally left blank. BE1-51/27R Introduction 9137200999 Rev D...
  • Page 7 SECTION 2 • CONTROLS AND INDICATORS ..................2-1 SECTION 3 • FUNCTIONAL DESCRIPTION ................... 3-1 SECTION 4 • INSTALLATION ........................4-1 SECTION 5 • TESTS AND ADJUSTMENTS .................... 5-1 APPENDIX A • TIME OVERCURRENT CHARACTERISTIC CURVES ........... A-1 9137200999 Rev D BE1-51/27R Introduction...
  • Page 8 This page intentionally left blank. BE1-51/27R Introduction 9137200999 Rev D...

  • Page 9: Table Of Contents

    Storage Temperature ........................1-10 Shock ..............................1-10 Vibration ............................1-10 Weight .............................. 1-10 Case Size ............................1-10 Figures Figure 1-1. Style Number Identification Chart ................... 1-7 Figure 1-2. Typical Instantaneous Response Time ................... 1-9 9137200999 Rev D BE1-51/27R General Information...
  • Page 10 Table 1-1. Timing, Characteristic Curve B4, with BE1-51/27R at 100% and 50% Voltages ..... 1-2 Table 1-2. Timing, Curve B4, BE1-51/27R at 25% Voltage (00 to 10 Time Dial Settings) ....... 1-2 Table 1-3. Timing, Curve B4, BE1-51/27R at 25% Voltage (20 to 99 Time Dial Settings) ....... 1-3 Table 1-4.

  • Page 11: Section 1 ● General Information

    SECTION 1 ● GENERAL INFORMATION DESCRIPTION BE1-51/27R Time Overcurrent Relays 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) and the neutral time overcurrent element, when supplied, operate independently of the voltage restraint function.

  • Page 12: Operating Characteristics At Reduced Voltages

    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 13: Standard Features

    0.537 5.00 20.00 0.111 0.154 0.188 0.231 0.316 0.400 0.526 Table 1-3. Timing, Curve B4, BE1-51/27R at 25% Voltage (20 to 99 Time Dial Settings) Time Dial Setting (Seconds) Multiple of Multiple of Setting Pickup 0.38 1.50 5.671 8.222 10.788 13.344...

  • Page 14: 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 9137200999 Rev D...

  • Page 15: Integrating Timing

    Five power supply options are available. They are: • 24 Vdc • 48 Vdc • 125 Vdc and 100/125 Vac • 48 Vdc or 125 Vdc and 100/125 Vac • 250 Vdc and 240 Vac 9137200999 Rev D BE1-51/27R General Information...

  • Page 16: Targets

    Each relay is mounted in a drawout cradle and enclosed in a standard utility style case with either semi- flush or projection mounting (depending upon case style selected). An available test plug (Basler Electric part number 10095) allows the relay to be tested in place without disturbing external control circuit wiring.

  • Page 17: Specifications

    Figure 1-1. Style Number Identification Chart SPECIFICATIONS BE1-51/27R Time Overcurrent Relays electrical and physical specifications are as follows: 9137200999 Rev D BE1-51/27R General Information...

  • Page 18: Voltage Sensing Inputs

    Continuously adjustable over the range of 1 to 40 times the time overcurrent pickup setting. Instantaneous Overcurrent Measuring Accuracy ±2% of pickup setting. Instantaneous Overcurrent Dropout Ratio Better than 98% of pickup level. Instantaneous Response Figure 1-2 shows the typical response for the instantaneous pickup element. BE1-51/27R General Information 9137200999 Rev D...

  • Page 19: Time Delay Accuracy

    2.1 W T (high range) 240 Vac 90 to 270 Vac 14.2 VA ∗ Type R power supply may require 14 Vdc to begin operation. Once operating, the voltage may be reduced to 12 Vdc. 9137200999 Rev D BE1-51/27R General Information...

  • Page 20: Radio Frequency Interference (Rfi)

    13.0 lbs. (5.90 kg) Two-Phase and Neutral: 14.0 lbs. (6.35 kg) Three-Phase: 14.0 lbs. (6.35 kg) Three-Phase and Neutral: 14.4 lbs. (6.53 kg) Case Size S1 (Refer to Section 4 for case dimensions.) 1-10 BE1-51/27R General Information 9137200999 Rev D...
  • Page 21 INTRODUCTION............................ 2-1 Figures Figure 2-1. Location of Controls and Indicators ..................2-1 Tables Table 2-1. Controls and Indicators ......................2-2 Table 2-2. Sensing Input Ranges ......................2-3 Table 2-3. Target Installation Configurations .................... 2-4 9137200999 Rev D BE1-51/27R Controls and Indicators...
  • Page 22 This page intentionally left blank. BE1-51/27R Controls and Indicators 9137200999 Rev D...
  • Page 23 SECTION 2 ● CONTROLS AND INDICATORS INTRODUCTION BE1-51/27R controls and indicators are located on the front panel and right-side interior. The controls and indicators are shown in Figure 2-1 and described in Table 2-1. Your relay may not have all of the controls and indicators shown and described here.
  • Page 24 (towards rear of relay) for proper operation. The tap range plate (not shown) indicates the terminal connections (high or low) used to select the current sensing input range. The sensing input ranges are listed in Table 2-2. BE1-51/27R Controls and Indicators 9137200999 Rev D...
  • Page 25 0.65 0.75 0.80 Same as Range 1 ∗ For relays with sensing input ranges 1 or 9, connect the system wiring to the current sensing terminals for the desired range (HIGH or LOW). 9137200999 Rev D BE1-51/27R Controls and Indicators...
  • Page 26 Number of Instantaneous Elements Targets Installed (Types A and B) Sensing Element Function Input Type None TIME INST 1 INST 2 M, N R, S U, W B, C E, F Y, Z BE1-51/27R Controls and Indicators 9137200999 Rev D...
  • Page 27 Instantaneous Overcurrent (Options 1-1 and 1-2) ................3-3 Timed and Instantaneous Outputs ..................... 3-3 Auxiliary Outputs ..........................3-3 Push-to-Energize Pushbuttons......................3-3 Power Supply Status Output (Option 3-6) ..................3-4 Target Indicators ..........................3-4 Figures Figure 3-1. Functional Block Diagram ....................... 3-1 9137200999 Rev D BE1-51/27R Functional Description...
  • Page 28 This page intentionally left blank. BE1-51/27R Functional Description 9137200999 Rev D...

  • Page 29: Section 3 ● Functional Description

    SECTION 3 ● FUNCTIONAL DESCRIPTION GENERAL BE1-51/27R Time Overcurrent Relays are microprocessor-based devices that provide voltage restraint of the phase time overcurrent functions. BLOCK DIAGRAM ANALYSIS The following block diagram analysis is referenced to Figure 3-1. A microprocessor (not illustrated in Figure 3-1) processes signals, performs logic functions, and all of the time overcurrent computations.

  • Page 30: Power Supply

    100 percent and 25 percent of the nominal voltage, the circuit automatically lowers the selected time overcurrent pickup point proportionally. Instantaneous overcurrent operation, if present, is not affected. Neutral is not monitored for voltage, nor is the neutral time overcurrent pickup point restrained. BE1-51/27R Functional Description 9137200999 Rev D...

  • Page 31: Microprocessor (Not Shown)

    If either option 2-C or 2-E is present, each individual output relay can be directly energized for test purposes by the actuation of a front panel PUSH-TO-ENERGIZE OUTPUT pushbutton. The pushbutton is actuated by the insertion of a thin, non-conducting rod through an access hole in the front panel. 9137200999 Rev D BE1-51/27R Functional Description...

  • Page 32: Power Supply Status Output (Option 3-6)

    NOTE Prior to August 2007, BE1-51/27R target indicators consisted of magnetically latched, disc indicators. These mechanically latched target indicators have been replaced by the electronically latched LED targets in use today.
  • Page 33 Figure 4-20. Relay Signals and Current Pickup Example for 3-Phase Fault (X =2 X” ) ......4-18 Figure 4-21. System Example ......................... 4-20 Figure 4-22. Relay 51/27 Coordination with Relay 67 for Fault 3 Example ..........4-23 Tables Table 4-1. Three-Phase Fault Currents ....................4-20 9137200999 Rev D BE1-51/27R Installation...
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  • Page 35: Section 4 ● Installation

    SECTION 4 ● INSTALLATION INSTALLATION BE1-51/27R relays are shipped in sturdy cartons to prevent damage during transit. Upon receipt of a relay, check the model and style number against the requisition and packing list to see that they agree. Inspect the relay for shipping damage. If there is evidence of damage, file a claim with the carrier, and notify your sales representative or Basler Electric.
  • Page 36 D2853-22 06-15-99 Figure 4-1. Outline Dimensions, Side View, Semi-Flush Mounted, Double-Ended Case BE1-51/27R Installation 9137200999 Rev D...
  • Page 37 Figure 4-2. Outline Dimensions, Side View, Projection Mounted, Double-Ended Case 9137200999 Rev D BE1-51/27R Installation...
  • Page 38 Figure 4-3. Outline Dimensions, Front View, Case Cover BE1-51/27R Installation 9137200999 Rev D...
  • Page 39 Figure 4-4. Panel Cutting and Drilling Dimensions, Semi-Flush Mounting, Double-Ended Case 9137200999 Rev D BE1-51/27R Installation...
  • Page 40 Figure 4-5. Panel Drilling Dimensions, Projection Mounting, Double-Ended Case BE1-51/27R Installation 9137200999 Rev D...

  • Page 41: Connections

    2 plugs for 20-terminal cases). Removal of the connection plug(s) opens the normally open trip contact circuits and shorts the normally closed trip circuits before opening the power and sensing circuits. P0050-03 Figure 4-6. Typical External Connections, Current Operated Targets, DC Powered 9137200999 Rev D BE1-51/27R Installation...
  • Page 42 Figure 4-7. Typical Sensing External Connections, Sensing Input Type M or N Figure 4-8. Typical Sensing External Connections, Sensing Input Type R or S BE1-51/27R Installation 9137200999 Rev D...
  • Page 43 Figure 4-9. Typical Sensing External Connections, Sensing Input Type U or W Figure 4-10. Typical Sensing External Connections, Sensing Input Type B or C 9137200999 Rev D BE1-51/27R Installation...
  • Page 44 Figure 4-11. Typical Sensing External Connections, Sensing Input Type E or F Figure 4-12. Typical Sensing External Connections, Sensing Input Type Y or Z 4-10 BE1-51/27R Installation 9137200999 Rev D...
  • Page 45 Figure 4-13. Typical Internal Diagram, Sensing Input Type M or N 9137200999 Rev D BE1-51/27R Installation 4-11...
  • Page 46 Figure 4-14. Typical Internal Diagram, Sensing Input Type Y or Z 4-12 BE1-51/27R Installation 9137200999 Rev D...
  • Page 47 Figure 4-15. Typical Internal Diagram, Sensing Input Type B or C 9137200999 Rev D BE1-51/27R Installation 4-13...
  • Page 48 Figure 4-16. Typical Internal Diagram, Sensing Input Type R or S 4-14 BE1-51/27R Installation 9137200999 Rev D...
  • Page 49 Figure 4-17. Typical Internal Diagram, Sensing Input Type E or F 9137200999 Rev D BE1-51/27R Installation 4-15...
  • Page 50 Figure 4-18. Typical Internal Diagram, Sensing Input Type U or W 4-16 BE1-51/27R Installation 9137200999 Rev D...

  • Page 51: Maintenance

    MAINTENANCE BE1-51/27R relays require no preventative maintenance other than a periodic operational check. If the relay fails to function properly, contact Technical Sales Support at Basler Electric to coordinate repairs. STORAGE This device contains long-life aluminum electrolytic capacitors. For devices that are not in service (spares in storage), the life of these capacitors can be maximized by energizing the device for 30 minutes once per year.
  • Page 52 If we assume a fixed 25 percent of nominal pickup current, a significant margin in the time coordination with external protection is added, although the log scale tends to exaggerate this effect. Figure 4-20. Relay Signals and Current Pickup Example for 3-Phase Fault (X =2 X” 4-18 BE1-51/27R Installation 9137200999 Rev D...

  • Page 53: Setting Example

    115 kV system that is supplemented by two local 3,700 kVA generators. Line 1 is illustrated completely; line 2 is the same as line 1 and only shows major components. Settings are provided for the BE1-51/27R Time Overcurrent Relay with voltage restraint, BE1-51 Time Overcurrent Relay, and BE1-67 Phase Directional Overcurrent Relay.
  • Page 54 Figure 4-21. System 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. Actual currents will be the sum of the table values plus the pre-fault load currents.

  • Page 55: Coordination With Feeder 51 Relay For Fault 1

    0.35 s). As the current decays, the times converge and cross because the 67 relay pickup is 300 amperes vs. 97 amperes for 51/27 relays (see calculation below for steady-state multiple of 0.86 for the 67 relays). So coordination may not be achieved for this double contingency with the generator 9137200999 Rev D BE1-51/27R Installation 4-21...

  • Page 56: Checking Coordination With Relay 67 For Fault 3

    R fails to interrupt the fault. Redundant line relaying will minimize the need for generator tripping. Use of a breaker-failure timer set to about 0.25 seconds would avoid generator tripping for a failure of breaker R to interrupt. 4-22 BE1-51/27R Installation 9137200999 Rev D...

  • Page 57: Neutral Element Backup Settings

    (4) Set the time element (51N) at 0.2 s for 970 amperes primary (see B3 curve): multiples TIME DIAL × (5) Set the instantaneous (50N) pickup at 5 amperes: The maximum ground fault current is: times Relay pickup 9137200999 Rev D BE1-51/27R Installation 4-23...
  • Page 58 This page intentionally left blank. 4-24 BE1-51/27R Installation 9137200999 Rev D...
  • Page 59 Figure 5-5. Test Setup for Sensing Input Type E or F (Three-Phase with Neutral Sensing) ....5-4 Figure 5-6. Test Setup for Sensing Input Type Y or Z (Two-Phase with Neutral Sensing) ....... 5-5 9137200999 Rev D BE1-51/27R Tests and Adjustments...
  • Page 60 This page intentionally left blank. BE1-51/27R Tests and Adjustments 9137200999 Rev D...

  • Page 61: Section 5 ● Tests And Adjustments

    Figure 5-4 Ensure that the timed output terminals 1 and 10 are connected. Also, verify that either A, B, or C current sense terminals are connected initially (N terminals will be connected later 9137200999 Rev D BE1-51/27R Tests and Adjustments...
  • Page 62 Ensure that the relay front panel TARGETS, if present, are reset. Step 6. Step 7. Apply 100% of nominal voltage based on the sensing input type for your relay. Figure 5-1. Test Setup for Sensing Input Type M or N (Single-Phase Sensing) BE1-51/27R Tests and Adjustments 9137200999 Rev D...
  • Page 63 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) 9137200999 Rev D BE1-51/27R Tests and Adjustments...
  • Page 64 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 9137200999 Rev D...

  • Page 65: Time Overcurrent Pickup Test

    Slowly adjust the test set, increasing the overcurrent threshold toward the value of the front panel TAP selector J setting until the front panel TIMING indicator just illuminates. Do not disturb this setting. 9137200999 Rev D BE1-51/27R Tests and Adjustments...
  • Page 66 Step 21. Record the current reading and remove input current. RESULT: The recorded value should be within ±5% of the front panel TAP (NEUTRAL) selector J setting for the neutral maximum overcurrent pickup point for the time overcurrent element. BE1-51/27R Tests and Adjustments 9137200999 Rev D...

  • Page 67: Timed Output Test

    For relays having single-phase or three-phase sensing (Sensing Input Types B, C, M, N, R, or S) with instantaneous overcurrent option 1-1 or 1-2, proceed to the instantaneous overcurrent test. All other relays proceed to the voltage restraint test. 9137200999 Rev D BE1-51/27R Tests and Adjustments...

  • Page 68: Instantaneous Overcurrent Pickup Test

    Step 4. selector A setting. Step 5. Slowly adjust the test set, increasing the overcurrent threshold toward the value of the front panel TAP selector A setting until the Instantaneous 1 output relay energizes. BE1-51/27R Tests and Adjustments 9137200999 Rev D...

  • Page 69: Voltage Restraint Test

    Perform the preliminary instructions. Set the front panel TAP selector to A. Step 2. Step 3. Verify that test voltage is 100% of nominal voltage based on the sensing input type for your relay. 9137200999 Rev D BE1-51/27R Tests and Adjustments...

  • Page 70: Adjustments Of Controls For Relay Operation

    For adjustment of the front panel TAP (NEUTRAL) selector, the relay is reconnected for neutral sensing by this procedure. 5-10 BE1-51/27R Tests and Adjustments 9137200999 Rev D...

  • Page 71: Time Overcurrent Curve Selection (Timing Type Z1, Z2, And Z3 Only)

    2-1 for the location of the logic board and curve selector. Step 3. Select the desired curve. See Table A-2 for the desired curve and selector position. Step 4. Re-install the front panel and the front cover. 9137200999 Rev D BE1-51/27R Tests and Adjustments 5-11...

  • Page 72: Time Delay Selection

    Because the lower limit for this pickup is determined by the front panel TAP selector setting and the front panel TAP (CAL) control position, ensure that these adjustments have been performed as in the paragraph TAP and TAP (NEUTRAL) Selector Setting. 5-12 BE1-51/27R Tests and Adjustments 9137200999 Rev D...

  • Page 73: 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. 9137200999 Rev D BE1-51/27R Tests and Adjustments 5-13...
  • Page 74 This page intentionally left blank. 5-14 BE1-51/27R Tests and Adjustments 9137200999 Rev D...
  • Page 75 Figure A-46. Timing Type B5, Inverse with Integrated Algorithm ............A-26 Figure A-47. Timing Type B5, Inverse with Integrated Algorithm and Extended Timing ......A-26 Figure A-48. Timing Type B6, Very Inverse with Integrated Algorithm ........... A-27 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves...
  • Page 76 Figure A-69. Timing Type C8, I t Limit #8 with Integrated Algorithm and Extended Timing ....A-37 Tables Table A-1. Timing Choices with Available Curves ..................A-1 Table A-2. Timing Curve Selection Table ....................A-2 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 77 Limit 5 t with Limit 5 t with Limit 6 t with Limit 6 t with Limit 7 t with Limit 7 t with Limit 8 t with Limit 8 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves...
  • Page 78 — A-34 — — — E5 - Inverse — A-35 — — — E6 - Very Inverse — A-36 — — — E7 - Extremely Inverse — C,D,E,F A-37 — — — BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 79 Figure A-1. Timing Type B1, Short Inverse Figure A-2. Timing Type B1, Short Inverse with Extended Timing Range 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves...
  • Page 80 Figure A-3. Timing Type B2, Long Inverse Figure A-4. Timing Type B2, Long Inverse with Extended Timing Range BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 81 Figure A-5. Timing Type B3, Definite Time Figure A-6. Timing Type B3, Definite Time with Extended Timing Range 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves...
  • Page 82 Figure A-7. Timing Type B4, Moderately Inverse Figure A-8. Timing Type B4, Moderately Inverse with Extended Timing Range BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 83 Figure A-9. Timing Type B5, Inverse Figure A-10. Timing Type B5, Inverse with Extended Timing Range 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves...
  • Page 84 Figure A-12. Timing Type B6, Very Inverse with Figure A-11. Timing Type B6, Very Inverse Extended Timing Range BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 85 Figure A-13. Timing Type B7, Extremely Inverse Figure A-14. Timing Type B7, Extremely Inverse with Extended Timing Range 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves...
  • Page 86 Figure A-15. Timing Type B8, I Figure A-16. Timing Type B8, I with Extended Timing Range A-10 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 87 Figure A-17. Timing Type C1, I t with Limit #1 Figure A-18. Timing Type C1, I t with Limit #1 and Extended Timing Range 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-11...
  • Page 88 Figure A-19. Timing Type C2, I t with Limit #2 Figure A-20. Timing Type C2, I t with Limit #2 and Extended Timing Range A-12 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 89 Figure A-21. Timing Type C3, I t with Limit #3 Figure A-22. Timing Type C3, I t with Limit #3 and Extended Timing Range 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-13...
  • Page 90 Figure A-24. Timing Type C4, I t with Limit #4 Figure A-23. Timing Type C4, I t with Limit #4 and Extended Timing Range A-14 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 91 Figure A-25. Timing Type C5, I t with Limit #5 Figure A-26. Timing Type C5, I t with Limit #5 and Extended Timing Range 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-15...
  • Page 92 Figure A-27. Timing Type C6, I t with Limit #6 Figure A-28. Timing Type C6, I t with Limit #6 and Extended Timing Range A-16 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 93 Figure A-29. Timing Type C7, I t with Limit #7 Figure A-30. Timing Type C7, I t with Limit #7 and Extended Timing Range 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-17...
  • Page 94 Figure A-31. Timing Type C8, I t with Limit #8 Figure A-32. Timing Type C8, I t with Limit #8 and Extended Timing Range A-18 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 95 Figure A-33. Timing Type E2, BS 142 Figure A-34. Timing Type E4, Long Inverse BS 142 Inverse 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-19...
  • Page 96 Figure A-36. Timing Type E6, Figure A-35. Timing Type E5, BS 142 Very Inverse BS 142 Inverse A-20 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 97 Figure A-37. Timing Type E7, BS 142 Extremely Inverse 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-21...
  • Page 98 Figure A-38. Timing Type B1, Short Inverse Figure A-39. Timing Type B1, Short Inverse with with Integrated Algorithm Integrated Algorithm and Extended Timing A-22 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 99 Figure A-40. Timing Type B2, Long Inverse Figure A-41. Timing Type B2, Long Inverse with with Integrated Algorithm Integrated Algorithm and Extended Timing 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-23...
  • Page 100 Figure A-42. Timing Type B3, Definite Time Figure A-43. Timing Type B3, Definite Time with with Integrated Algorithm Integrated Algorithm and Extended Timing A-24 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 101 Figure A-44. Timing Type B4, Moderately Figure A-45. Timing Type B4, Moderately Inverse with Integrated Algorithm. Inverse with Integrated Algorithm and Extended Timing 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-25...
  • Page 102 Figure A-46. Timing Type B5, Inverse with Figure A-47. Timing Type B5, Inverse with Integrated Algorithm Integrated Algorithm and Extended Timing A-26 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 103 Figure A-48. Timing Type B6, Very Inverse Figure A-49. Timing Type B6, Very Inverse with with Integrated Algorithm Integrated Algorithm and Extended Timing 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-27...
  • Page 104 Figure A-51. Timing Type B7, Extremely Inverse Figure A-50. Timing Type B7, Extremely Inverse with Integrated Algorithm with Integrated Algorithm and Extended Timing A-28 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 105 Figure A-52. Timing Type B8, I Figure A-53. Timing Type B8, I t with Integrated with Integrated Algorithm Algorithm and Extended Timing 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-29...
  • Page 106 Figure A-54. Timing Type C1, I t Limit #1 Figure A-55. Timing Type C1, I t Limit #1 with Integrated Algorithm with Integrated Algorithm A-30 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 107 Figure A-56. Timing Type C2, I t Limit #2 Figure A-57. Timing Type C2, I t Limit #2 with with Integrated Algorithm Integrated Algorithm and Extended Timing 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-31...
  • Page 108 Figure A-59. Timing Type C3, I t Limit #3 with Figure A-58. Timing Type C3, I t Limit #3 Integrated Algorithm and Extended Timing with Integrated Algorithm A-32 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 109 Figure A-60. Timing Type C4, I t Limit #4 Figure A-61. Timing Type C4, I t Limit #4 with with Integrated Algorithm Integrated Algorithm and Extended Timing 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-33...
  • Page 110 Figure A-62. Timing Type C5, I t Limit #5 Figure A-63. Timing Type C5, I t Limit #5 with with Integrated Algorithm Integrated Algorithm and Extended Timing A-34 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 111 Figure A-64. Timing Type C6, I t Limit #6 Figure A-65. Timing Type C6, I t Limit #6 with with Integrated Algorithm Integrated Algorithm and Extended Timing 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-35...
  • Page 112 Figure A-66. Timing Type C7, I t Limit #7 Figure A-67. Timing Type C7, I t Limit #7 with with Integrated Algorithm Integrated Algorithm and Extended Timing A-36 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
  • Page 113 Figure A-68. Timing Type C8, I t Limit #8 Figure A-69. Timing Type C8, I t Limit #8 with with Integrated Algorithm Integrated Algorithm and Extended Timing 9137200999 Rev D BE1-51/27R Time Overcurrent Characteristic Curves A-37...
  • Page 114 This page intentionally left blank. A-38 BE1-51/27R Time Overcurrent Characteristic Curves 9137200999 Rev D...
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