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Basler BE1-81 Instruction Manual

Digital underfrequency relay
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  • Page 1 +05647%6+10/#07#. &+)+6#.70&'4(4'37'0%;4'.#; /1&'.$' 2WDNKECVKQP  4GXKUKQP $ ...
  • Page 2 INTRODUCTION This Instruction Manual provides information concerning the operation and installation of the BE1-81 Digital Underfrequency Relay. To accomplish this, the following is provided. Specifications Functional Characteristics Mounting Information Connections Testing 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 First Printing: October 1979 Printed in USA © 1995, Basler Electric Co., Highland, IL 62249 May 1996 CONFIDENTIAL INFORMATION OF BASLER ELECTRIC COMPANY, HIGHLAND, IL. 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 COMPANY.

  • Page 4: Table Of Contents

    CONTENTS SECTION 1 GENERAL INFORMATION Purpose ............1-1 Description .
  • Page 5 CONTENTS - Continued SECTION 4 INSTALLATION - Continued Relay Mounting - Continued S1 Case, Double-Ended, Projection Mounting, Panel Drilling Diagram . . . 4-10 S1 Case, Double-Ended, Projection Mounting, Rear View ... . . 4-11 S1 Case, Double-Ended, Projection Mounting, Side View .

  • Page 6: Section 1 General Information

    Individual circuit components are accessible by removal of the individual printed circuit boards from the relay cradle and using an extender card (Basler part number 9 1655 00 100) to test or troubleshoot. A front panel, electrically operated, manually reset target may be selected to indicate that a fault has occurred and the relay has operated.
  • Page 7 BE1-81 General Information Figure 1-1. Inverse Time Curves, 50 Hertz Option...
  • Page 8 BE1-81 General Information Figure 1-2. Inverse Time Curves, 60 Hertz Option...

  • Page 9: Sample Style Number

    Sample Style Number Style number identification chart (Figure 1-3) defines the electrical characteristics and operational features included in BE1-81 relays. For example, if the style number were T1E-E1C-A0N0F, the device would have the following: (T) Single phase sensing input type...

  • Page 10: Specifications

    BE1-81 General Information SPECIFICATIONS Power Input One of the six types of power supplies listed in Table 1-1 may be optionally selected to provide internal relay operating power. Table 1-1. Power Supply Options Frequency Sensing Input Input sensing circuits are nominally rated 120 Vac at the selected frequency.
  • Page 11 BE1-81 General Information Dropout Ratio 99 percent of pickup value (frequency difference). Temperature Stability Pickup point variation will not exceed 0.03 hertz over the operating temperature range. Undervoltage Inhibit The relay is factory adjusted for an 80 Vac undervoltage inhibit level that prevents nuisance tripping during protected equipment start-up.

  • Page 12: Section 2 Controls And Indicators

    SECTION 2 CONTROLS AND INDICATORS GENERAL Table 2-1 lists and describes the controls and indicators of BE1-81 Digital Underfrequency Relays. Table 2-1. Controls and Indicators (Refer to Figures 2-1 and 2-2) Letter Control or Indicator Function or Indicator DELAY CYCLES switches...
  • Page 13 BE1-81 Controls And Indicators Figure 2-1. Location Of Controls And Indicators (Option E1)
  • Page 14 BE1-81 Controls And Indicators Figure 2-2. Location Of Controls And Indicators (Option D1)
  • Page 15 BE1-81 Controls And Indicators Figure 2-3. Location Of Assemblies...

  • Page 16: Section 3 Functional Description

    SECTION 3 FUNCTIONAL DESCRIPTION FUNCTIONAL DESCRIPTION Functional circuit descriptions provided in this section apply to both the 50 hertz and 60 hertz underfrequency relays. Refer to Figure 3-1 for a typical functional block diagram. Sensing When single-phase 120 Vac is applied to the sensing input, the input transformer provides the proper signal levels to the voltage inhibit and input conditioning circuits.

  • Page 17: Power Supply

    BE1-81 Functional Description Power Supply A variety of power supply options allow a wide range of external voltage inputs for relay operation. Relay operating power is developed by the low burden, flyback switching design, solid-state power supply. A nominal plus or minus twelve volts dc is delivered to the internal circuitry. Power supply inputs are not polarity sensitive.

  • Page 18: Synchronizer Circuit

    BE1-81 Functional Description Synchronizer Circuit This circuit synchronizes the squarewave (representative of the input waveform) with the crystal reference oscillator to generate a synchronized zero crossing pulse. The zero crossing pulse resets the system timing. Each time this zero crossing pulse occurs, a new frequency comparison is initiated.

  • Page 19: Internally Operated Target Driver

    BE1-81 Functional Description Internally Operated Target Driver Output from the time delay circuit is applied to this circuit to drive the target indicator. The indicator is tripped regardless of the current level in the trip circuit. Current Operated Target Driver This circuit will operate when a minimum dc current of 0.2 amperes flow in the output trip circuit.

  • Page 20: Section 4 Installation

    Visually inspect the relay for damage that may have occurred during shipment. 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.
  • Page 21 BE1-81 Installation Figure 4-1. S1 Case, Panel Drilling Diagram, Semi-Flush Mounting Figure 4-2. S1 Case, Outline Dimensions, Front View...
  • Page 22 BE1-81 Installation Figure 4-3. S1 Case, Single-Ended, Semi-Flush Mounting, Side View...
  • Page 23 BE1-81 Installation Figure 4-4. S1 Case, Single-Ended, Semi-Flush Mounting, Outline Dimensions, Rear View...
  • Page 24 BE1-81 Installation Figure 4-5. S1 Case, Single-Ended, Projection Mounting, Panel Drilling Diagram, Rear View...
  • Page 25 BE1-81 Installation Figure 4-6. S1 Case, Single-Ended, Projection Mounting, Rear View...
  • Page 26 BE1-81 Installation Figure 4-7. S1 Case, Single-Ended, Projection Mounting, Side View...
  • Page 27 BE1-81 Installation Figure 4-8. S1 Case, Double-Ended, Semi-Flush Mounting, Side View...
  • Page 28 BE1-81 Installation Figure 4-9. S1 Case, Double-Ended, Semi-Flush Mounting, Outline Dimensions, Rear View...
  • Page 29 BE1-81 Installation Figure 4-10. S1 Case, Double-Ended, Projection Mounting, Panel Drilling Diagram, Rear View 4-10...
  • Page 30 BE1-81 Installation Figure 4-11. S1 Case, Double-Ended, Projection Mounting, Rear View 4-11...
  • Page 31 BE1-81 Installation Figure 4-12. S1 Case, Double-Ended, Projection Mounting, Side View 4-12...

  • Page 32: Connections

    BE1-81 Installation CONNECTIONS NOTE Be sure the relay case is hard-wired to earth ground with no smaller than 12 AWG copper wire attached to the ground terminal on the rear of the relay case. When the relay is configured in a system with other protective devices, it is recommended to use a separate lead to the ground bus from each relay.
  • Page 33 BE1-81 Installation Figure 4-14. DC Control Connections 4-14...

  • Page 34: Internal Connections, Style Number T?E ?1? A0S5

    BE1-81 Installation Figure 4-15. Internal Connections, Style Number T?E ?1? A0S5? 4-15...

  • Page 35: Internal Connections, Style Number T?E ?1C A2S5

    BE1-81 Installation Figure 4-16. Internal Connections, Style Number T?E ?1C A2S5? 4-16...

  • Page 36: Section 5 Testing

    SECTION 5 TESTING GENERAL The test setups and procedures contained in this section are suggested for use in verifying or setting the desired pickup frequency threshold, as well as the time delay parameters, for both the definite and inverse time delay style of relay. Accuracy of the measurements in these procedures is dependent upon the stability of the test frequency sources, and the resolution of the frequency and time measuring test equipment.

  • Page 37: Definite Time Delay (Option E1) Test Procedure

    BE1-81 Testing DEFINITE TIME DELAY (OPTION E1) TEST PROCEDURE To verify/set underfrequency 50 hertz (Style T2) or 60 hertz (Style T1) relays equipped with definite time delay, perform the following steps. Step 1. Connect the relay as shown in Figure 5-1.
  • Page 38 BE1-81 Testing For example: DELAY CYCLES setting = 39 TRIP FREQUENCY hertz below setting = 3.00 Applied Trip Frequency = 57 hertz: 39  1 TD TD TD 0.701 second , ±0.020 second of calculated delay time . NOTE The delay time accuracy should be as specified above or within the accuracy of the test equipment, whichever is greater.
  • Page 39 BE1-81 Testing Step 8. Read the trip frequency as indicated by the frequency source, or by an external frequency measuring device. The pickup point should be within 0.035 hertz of the selected pickup frequency set in Step 4 for the 50 hertz (T2) relays or 0.030 hertz for the 60 hertz (T1) relays, or within the test set accuracy, whichever is greater.
  • Page 40 BE1-81 Testing Step 23. Again using the 60 hertz 0 TIME curve as an example, the time delay recorded in Step 22 should be 0.135 seconds ±15 percent. Here again, subtract test frequency (57 hertz) from nominal (60 hertz) to arrive at hertz below pickup (3.0 hertz). Subtract front panel TRIP FREQUENCY setting (1.00) from hertz below pickup (3.0) to get normalized (2.0) hertz below...

  • Page 41: Section 6 Maintenance

    Service Manual (publication number 9 1064 00 620). If factory repair is desired, contact the Customer Service Department of the Power Systems Group, Basler Electric, for a return authorization number prior to shipping.

  • Page 42: Test Plug

    BE1-81 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. This provides access to the external stud connections as well as to the internal circuitry.
  • Page 43 5'%6+10 /#07#.%*#0)'+0(14/#6+10 57//#4;#0&%41554'('4'0%')7+&' This section contains information concerning the previous editions of the manual. The substantive changes to date are summarized in the Table 7-1. Table 7-1. Changes Revision Change ECA/Date Revised the entire manual to conform with the current instructional 14138/04-18-96 manual style and relay configuration.

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