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Basler BE1-24 Instruction Manual

Volts per hertz overexcitation relay
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INSTRUCTION MANUAL
for
BE1-24
VOLTS PER HERTZ
OVEREXCITATION RELAY
Publication: 9 1716 00 990
Revision: E
08/98

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Summary of Contents for Basler BE1-24

  • Page 1 INSTRUCTION MANUAL BE1-24 VOLTS PER HERTZ OVEREXCITATION RELAY Publication: 9 1716 00 990 Revision: E 08/98...
  • Page 2 INTRODUCTION This Instruction Manual provides information concerning the operation and installation of BE1-24 Volts per Hertz Overexcitation Relay. To accomplish this, the following is provided. Specifications Functional characteristics Installation Operational Tests Mounting Information WARNING To avoid personal injury or equipment damage, only qualified personnel should perform the procedures presented in this manual.
  • Page 3 August 1998 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

    Connections ......................4-8 SECTION 5 OPERATIONAL TEST..................... 5-1 General ........................5-1 Relay Operating Precautions ................... 5-1 Built-In-Test......................5-1 Operational Test Procedures ................... 5-1 Pickup........................ 5-2 Instantaneous Time Verification ................ 5-3 Definite Time Delay Alarm................. 5-3 Inverse Square Timing ..................5-4 BE1-24 Introduction...
  • Page 5 CONTENTS - CONTINUED SECTION 6 MAINTENANCE ...................... 6-1 General ........................6-1 In-House Repair....................... 6-1 Storage ........................6-1 Test Plug........................6-1 SECTION 7 MANUAL CHANGE INFORMATION ..............7-1 Changes........................7-1 BE1- 24 Introduction...

  • Page 6: General Information

    SECTION 1 • GENERAL INFORMATION PURPOSE BE1-24 Volts Per Hertz Overexcitation Relays are specifically designed to protect transformers, generators and iron core reactors from the adverse effects of excessive heating resulting from overexcitation. Overexcitation exists whenever the per unit volts per hertz exceeds the equipment design limitations.

  • Page 7: Relay Characteristics

    Once heated, metal does not cool instantaneously. To accommodate this characteristic, the BE1-24 also has a linear reset characteristic which can be adjusted to follow the cooling rate of the protected equipment. So, as heat builds up and dissipates within the protected equipment due to overexcitation excursions, it is closely protected by the BE1-24 tripping and reset characteristics.
  • Page 8 Figure 1-2 illustrates a situation where these two units have different characteristics and yet can both be protected by the BE1-24. Utilizing the alarm function (with its definite time delay), and in combination with the inverse square characteristic, the transformer generator combination may be protected with a single BE1-24 Volts-Per-Hertz Overexcitation Relay.
  • Page 9 Figure 1-1. Inverse Square vs. Two-Step BE1-24 General Information...
  • Page 10 Figure 1-2. Protection Characteristics of the BE1-24 BE1-24 General Information...

  • Page 11: Model And Style Number

    Electrical characteristics and operational features included in a specific relay are defined by a combination of letters and numbers which constitute the relay style number. The model number, BE1-24, designates the relay as a Basler Electric Class 100 Volts Per Hertz Overexcitation Relay. The style number together with the model number describe the features and options in a particular relay and appear on the front panel, drawout cradle, and inside the case assembly.
  • Page 12 Figure 1-3. Style Number Identification Chart BE1-24 General Information...

  • Page 13: Specifications

    (Timed Trip, Alarm, and optional setting above 3.99 V/Hz or below 1.00 V/Hz is limited to 3.99 and Instantaneous Trip) 1.00 V/Hz respectively.) Pickup Accuracy Pickup accuracy is dependent upon sensed frequency as shown in Table 1-2. BE1-24 General Information...
  • Page 14 30 A for 1 second, 7 A for 2 minutes, and 3 A continuous. Current operated targets only if the relay has normally open (NO) output contacts. BE1-24 General Information...
  • Page 15 -40  C (-40  F) to +70  C (+158  F) Operating -65  C (-85  F) to +100  C (+212  F) Storage Weight 17.3 pounds maximum Case Size All relays are supplied in a M1 double-ended case. 1-10 BE1-24 General Information...
  • Page 16 Figure 1-4. Inverse Square Characteristic Curves BE1-24 General Information 1-11...
  • Page 17 Figure 1-5. Inverse Square Characteristic Curves (Multiples of Pickup vs. Time) 1-12 BE1-24 General Information...

  • Page 18: Human-Machine Interface

    SECTION 2 • HUMAN-MACHINE INTERFACE CONTROLS AND INDICATORS Table 2-1 lists and briefly describes the BE1-24 controls and indicators. Reference the callouts to Figure 2-1. Table 2-1. BE1-24 Controls and Indicators Locator Control or Indicator Function INST. PICKUP Thumbwheel adjustment establishes the pickup point for the (Optional) instantaneous output.
  • Page 19 Figure 2-1. Location of Controls and Indicators BE1-24 Human-Machine Interface...

  • Page 20: Functional Description

    Input Sensing BE1-24 relays have input sensing transformers that sense a single phase of system voltage. These transformers have a measuring range of 10 to 360 volts at frequencies from 3 to 72 hertz. The rating of five volts per hertz identifies the absolute maximum voltage at a given frequency at which the relay is able to perform correctly for all system operating conditions.

  • Page 21: Third Harmonic Rejection Filter

    When the monitored waveform is at a level that is above the previously established reference value, the appropriate action is initiated (i.e., instantaneous output energized, or TIME TRIP or ALARM LED lit and timing initiated). BE1-24 Functional Description...

  • Page 22: Output Functions

    OUTPUT FUNCTIONS BE1-24 Volts Per Hertz Overexcitation Relays have two standard and one optional independent output functions. Standard independent output functions are the inverse square timed trip and the definite time alarm. The optional independent output function is the instantaneous trip function.

  • Page 23: Definite Time Alarm

    Associated with the trip integrating timer is a timing status display consisting of a series of 10 LEDs (Figure 3-4). Figure 3-4. Time Progression Display This display indicates the status of the integrating timer. As time accumulates toward trip, these LEDs are illuminated. Each LED represents 10 percent of the total required for tripping. BE1-24 Functional Description...

  • Page 24: Watchdog Circuitry

    0.125 inches. 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 25 Nominal +12 Vdc is delivered to the relay internal circuitry. Input (source voltage) for the power supply is not polarity sensitive. A red LED turns ON to indicate that the power supply is functioning properly. BE1-24 Functional Description...

  • Page 26: 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. When relay is to be placed in service, it is recommended that the operational test procedure (Section 5, Testing ) be performed prior to installation.
  • Page 27 Figure 4-1. M1 Case, Outline Dimensions, Front View BE1-24 Installation...
  • Page 28 Figure 4-2. M1 Case, Double-Ended, Semi-Flush Mounting, Outline Dimensions, Side View BE1-24 Installation...
  • Page 29 Figure 4-3. M1 Case, Double-Ended, Projection Mounting, Outline Dimensions, Side View BE1-24 Installation...
  • Page 30 Figure 4-4. M1 Case, Double-Ended, Panel Drilling Diagram, Rear View BE1-24 Installation...
  • Page 31 Figure 4-5. M1 Case, Panel Drilling Diagram BE1-24 Installation...
  • Page 32 Figure 4-6. M1 Case, Projection Mounting, Outline Dimensions, Rear View BE1-24 Installation...

  • Page 33: Connections

    Connections should be made with minimum wire size of 14 AWG except as noted for the ground wire. Typical internal connections are shown in Figure 4-7. Typical AC sensing connections are shown in Figure 4-8, and a typical control circuit diagram is shown in Figure 4-9. BE1-24 Installation...
  • Page 34 Figure 4-7. Typical Internal Connections BE1-24 Installation...
  • Page 35 Figure 4-8. Typical AC Sensing Connections Figure 4-9. Typical Control Circuit Diagram 4-10 BE1-24 Installation...

  • Page 36: General

    Timing status display turns ON (each LED turns ON in ascending order, green to red). Alarm pickup LED turns ON. Instantaneous output relay energizes. Alarm output relay energizes. Timed trip output relay energizes. If auxiliary output relays have been specified, they will energize simultaneously with the respective main output relays. BE1-24 Testing...

  • Page 37: Operational Test Procedures

    At this time, other V/Hz settings for pickup may be verified using the procedures in steps 3 through 5. Pickup accuracies are as follows. Accuracy at 25   C Frequency 40-72 hertz ±1 hertz 20-40 hertz ±2 hertz 3-20 hertz ±8 hertz BE1-24 Testing...

  • Page 38: Instantaneous Time Verification

    Apply 180 Vac at 60 Hz to the unit under test (M = 1.5). Measure and record the interval from initiation of input condition to instantaneous output contact transition. Verify that the recorded time is less than eight cycles. Actual V/Hz condition V/Hz Setting BE1-24 Testing...

  • Page 39: Definite Time Delay Alarm

    Verify that the timed interval from initiation of input condition to transition of the timed trip output contacts agrees with the characteristic curve graph in Section 1 (estimated 2.1 ±0.2 seconds). BE1-24 Testing...
  • Page 40 Repeat steps 3 and 4 with input conditions of 180 Vac at 60 Hz (M = 1.5). Elapsed times should be as follows. Setting Elapsed Time 0.45 ±0.5 seconds 3.7 ±0.4 seconds 36 ±4 seconds This completes the operational test procedures. BE1-24 Testing...

  • Page 41: Section 6 • Maintenance

    SECTION 6 • MAINTENANCE GENERAL BE1-24 Volts Per Hertz Overexcitation Relays require no preventive maintenance other than a periodic operational test (refer to Section 5 for operational test procedure). 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

    TEST PLUG The test plug (Basler part number 10095 or G.E. part number 12XLA12A1) provides a quick, easy method of testing relays without removing them from their case. The test plug is simply substituted for the connection plug. This provides access to the external stud connections as well as to the internal circuitry.

  • Page 43: Section 7 • Manual Change Information

    Corrected Style Chart by changing power supply type Z from “230 Vac” to “240 Vac” and deleting “Selectable” from type Y. Added new power supply information to Section 3 in Power Supply paragraph starting with “Basler Electric enhanced the power supply design...”. Added new dimension figures to include all options available (M1 Double-Ended showing both mounting positions).

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