Megger SR-98 Instruction Manual
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Megger SR-98 Instruction Manual

Megger SR-98 Instruction Manual

Relay test set
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INSTRUCTION MANUAL
For
RELAY TEST SET
Model SR-98
The SR-98 includes a ROM-resident computer program. This program
belongs to Megger Corporation and contains trade secret ideas and
information of Megger Corporation. To the extent this program contains ideas,
Megger Corporation intends to protect and enforce its rights under state law.
To the extent the program is deemed to constitute a form of expression of
idea, Megger Corporation intends to protect and enforce its rights under the
Copyright Act of 1976. The Statutory Copyright notice has been affixed hereto
in the event that it is later determined that the program has been published
within the meaning of the Copyright Act of 1976.
It is essential that this instruction book be read thoroughly before
putting the equipment in service.
Part _51128
Date 01/25/2006

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  • Page 1 Megger Corporation and contains trade secret ideas and information of Megger Corporation. To the extent this program contains ideas, Megger Corporation intends to protect and enforce its rights under state law. To the extent the program is deemed to constitute a form of expression of idea, Megger Corporation intends to protect and enforce its rights under the Copyright Act of 1976.
  • Page 2 01/25/2006 COMMENTS Any comments or suggestions regarding the use of this test instrument or instruction manual would be appreciated. Send your comments to Megger, T M & S Department, 4271 Bronze Way, Dallas, TX 75237 IMPORTANT The information and data contained within this instruction manual are proprietary with Megger.
  • Page 3 SAFETY PRECAUTIONS WARNING: VOLTAGES GENERATED BY THIS INSTRUMENT CAN BE HAZARDOUS This instrument has been designed for operator safety; however, no design can completely protect against incorrect use. Electrical circuits are dangerous and can be lethal when lack of caution and poor safety practices are used. There are several standard safety precautions that should be taken by the operator.
  • Page 4 Category II INSTALLATION OPERATIONAL SAFETY Every consideration has been given to the design and construction of the SR-98 to make it a safe piece of test equipment as well as one that is accurate, reliable and easy to use. It must be remembered that the unit is capable of producing voltage and current levels that can be deadly if personnel come in contact with them.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS THEORY OF OPERATION........................... 1 UNIT PANEL ILLUSTRATION ......................1 DESCRIPTION OF CONTROLS AND INSTRUMENTATION ..............2 INPUT POWER..........................6 DISPLAY SCREENS ........................8 POWER UP SCREEN ......................8 TEST MENU Screen ......................8 ABOUT MENU........................9 LANGUAGE SELECTION Screen..................9 TIMER SETUP Screen.....................
  • Page 6 MOLDED CASE CIRCUIT BREAKERS ..................66 TIMING TEST OF MOLDED CASE CIRCUIT BREAKERS ............67 MOTOR OVERLOAD RELAYS..................... 69 PARALLEL PRINTER PORT ........................70 RS232 SERIAL DATA PORT........................70 SR-98 COMMAND SET..........................71 SPECIFICATIONS ............................76 PARTS LIST ............................... 86...

  • Page 7: Theory Of Operation

    Depending on type of test selected, other values may be displayed, such as Ohms, Watts, VARS, Phase Angle, Frequency or Power Factor. The independent outputs enable the SR-98 to provide an ac current, voltage (both ac and dc), or two ac voltages and a dc voltage, to meet numerous testing requirements in a wide variety of test applications.

  • Page 8: Description Of Controls And Instrumentation

    This interface terminal provides a 10 to 30 Volts AC output to a voltage coil of a phase angle meter. It should be noted that the voltage output is in-phase with the SR-98 main AC current output. DO NOT apply this voltage output to the current coil of a Phase Angle Meter.
  • Page 9 RESISTOR BANK, 2A, 10A, 15A Terminals (7): Three terminals are provided. Output current from the SR-98 may be series through the resistor elements. Labeling shows maximum current for which the resistors are rated. See SELECTION OF OUTPUT TERMINALS, CURRENT MAIN for use and ratings.
  • Page 10 MEASUREMENT INPUT Terminals ( 13 ): Two sets of terminals are provided. The V , voltage terminals, is used to measure external AC or DC voltages up to a maximum of 600 Volts. The I , current terminals, is used to measure external AC or DC currents up to a maximum of 6 amperes. Caution: Use properly rated CATII insulated test leads with the MEASUREMENT INPUT and AC or DC AUX voltage output terminals, part number 684000 and 684001 (see accessory list).
  • Page 11 Hardware Reset Button (17): This small recessed button is used to reset the hardware. In case of a total system shutdown, this button may be pressed to reset the hardware without switching the power on/off switch. Rotary Control Knob (18): The rotary knob rotates clockwise and counterclockwise to affect the highlighted field on the display screen.

  • Page 12: Input Power

    INPUT POWER There are two versions of the SR-98. One is rated for 230 volt operation only. The other has a universal input of 90 to 253 volts, 1700 VA max. Model SR-98-1/60 comes with a universal power input (90 - 253 VAC, 50/60 Hz input), a north American power cord and firmware set to default to 60 Hz output on power up.
  • Page 13 The SR-98-2/50 come with a standard 10 Amp, International Color code power cord as shown below. The cord is ready for wiring to the appropriate plug (depending on country). The following colors apply, Brown = Line, Blue = Neutral and Green/Yellow =...

  • Page 14: Display Screens

    DISPLAY SCREENS POWER UP SCREEN: The first screen that the operator will see after switching the unit on is the Power Up Screen. Using the associated Function keys at the bottom of the display screen, the user can select the Test Menu, the About Screen, Language Select Screen or Master Slave Select (change the screen contrast with the UP/DN arrow keys).

  • Page 15: About Menu

    ABOUT MENU: The About Menu displays the firmware Version Number, with date of release, along with the Copyright, see Copyright statement on front page of manual. LANGUAGE SELECTION Screen: This screen allows the user to select the desired operating language of the test set. Using the arrow keys, highlight to the desired language and press the SELECT function key at the bottom-right of the screen.

  • Page 16: Timer Setup Screen

    TIMER SETUP Screen The TIMER SETUP screen is used to set the Timer Start and Stop/Monitor Options, set the Start and Stop Latch Options, set Output Frequency, turn the Monitor Horn on and off and set the Delay Cycles for momentary operation. The user may use the arrow keys and the rotary knob to move from function to function and change the option.
  • Page 17 N.CLOSE (Normally Closed): The function of this position is to monitor normally closed dry contacts of the device under test. The Timer starts or stops at the opening of a normally closed dry contact. INIT (Initiate): When the TIMER START Mode is in this position, the Timer will start when the output, or test, is initiated using the INIT Button.

  • Page 18: Description Of Test Screens

    STOP LATCH : When the STOP circuit is latched ON , the stop latch allows timing to be stopped at the first operation of any selected stop gate. When the STOP circuit is latched OFF , the stop latch allows timing to be stopped by any stop gate and then restarted if the stop gate reverses (provided a start gate is still energized) and stopped when the stop gate is again true.

  • Page 19: Current Relay Test Screen

    CURRENT RELAY Test Screen The CURRENT RELAY Test Screen is used for testing all overcurrent, voltage controlled overcurrent, voltage restrained overcurrent and other AC current controlled relays, including motor overload relays and small molded case circuit breakers. If testing directional overcurrent, see DIRECTIONAL RELAY Test Screen. The following are descriptions of each of the displayed values, features or functions in the CURRENT RELAY Test Screen.
  • Page 20 DC VOLTS ( 00.0 V ): The value displayed is the measured output voltage from the DC AUX output terminals. The voltage value displayed in the ( 00.0 V ) is the estimated output for the selected output terminal. The actual output voltage may vary slightly depending on the actual load.
  • Page 21 ARM M/S: This function button arms the initiate circuit for initiation of the output current when operating two SR-98’s in the Master / Slave mode. When pressed, the CURRENT MAIN outputs will initiate simultaneously when the Master SR-98 INIT button is pressed.

  • Page 22: Impedance Relay Test Screen

    SOURCE RESET: This function button turns all the outputs off and sets them to zero. This one button may be used as a panic button to shut down all voltage and current outputs at one time. Note that the ( % ) or (00.0 V) settings under the measured values are still set.

  • Page 23: Directional Relay Test Screen

    DIRECTIONAL RELAY Test Screen: The DIRECTIONAL RELAY Test Screen is used to test all single-phase directional elements in directional overcurrent and ground overcurrent relays. Many of the same measured values seen in the OVERCURRENT RELAY Test Screen are in the DIRECTIONAL RELAY Test Screen (see descriptions in the OVERCURRENT RELAY φ...

  • Page 24: Metering Screen

    METERING Screen: The METERING Screen allows the SR-98 to measure external voltage and current, as a multi-purpose single-phase meter. AC or DC voltages up 600 Volts and AC or DC currents up to 6 Amperes may be measured. Other measured and calculated values are displayed such as Phase Angle, VAR, Power and Power Factor.

  • Page 25: Power Relay Test Screen

    DC VOLTS ( 00.0 V ): The value displayed is the measured output voltage from the DC AUX output terminals. The voltage value displayed in the ( 00.0 V ) is the estimated output for the selected output terminal. The actual output voltage may vary slightly depending on the actual load.

  • Page 26: Sync (Synchronizing) Relay Test Screen

    SYNC (Synchronizing) RELAY Test Screen: The SYNCH RELAY Test Screen is used to test synchronizing and sync check relays. It may also be used to test reverse phase, or phase sequence voltage relays, which can be tested using an Open-Delta test potential (see Testing Phase Sequence Undervoltage Relays).

  • Page 27: Reclose Relay Test Screen

    RECLOSE RELAY Test Screen: The RECLOSE RELAY Test Screen is used to test reclosing type relays. The reclosing relay test screen has the same measured values as the OVERCURRENT RELAY test screen, see OVERCURRENT RELAY Test Screen for descriptions. The primary difference is the number of shots expected before lockout.

  • Page 28: Selection Of Output Terminals

    AC AUX and DC AUX The SR-98 has two sets of voltage output terminals, one for AC and one for DC. The AC output is capable of providing 0 to 300 Volts AC with a maximum of 0.75 A. The DC output is capable of providing 0 to 250 Volts DC with a maximum of 0.4 Amperes.

  • Page 29: Selection Of Master Unit

    Additionally, the Master Unit controls the initiation of both AC CURRENT MAIN outputs. Since all Model SR-98 test sets are identical, any unit can be used as the Master Unit. Incorporated on the front panel of the SR-98 is an interface terminal port next to the...

  • Page 30: Service Data

    If damage or malfunction is suspected or repairs deemed necessary, consult a MEGGER Representative for assistance if it is unclear what course of action is needed. Be sure to provide all name plate data when making inquiries. BASIC TROUBLESHOOTING The troubleshooting information relies on the technician to have a through understanding of the operation of the unit.
  • Page 31 Preliminary testing of the SR-98 within its specified limits can help determine if a malfunction actually exists, identify the type of malfunction and define the general area of the failure. In many cases, the SR-98 will identify what the problem is and display an alarm description on the display screen, see Alarm Descriptions.
  • Page 32 Turn the unit on to back side, and slide the unit from the enclosure. Digital Display /Timer Section Basic troubleshooting is as follows: No display when the SR-98 is energized: Power supply failure, defective display IC's, defective components on printed circuit board, loose cable connection between power supply and printed circuit board.

  • Page 33: Alarm Descriptions

    When the SR-98 Timer calibration is being tested, the AC voltage variable is often overlooked. This is particularly true when the Timer is compared to a counter and the two are triggered simultaneously with an electronic switch. For best results, a DC voltage should be used to eliminate the variable.
  • Page 34 PFC2 Over Temp: See PFC1 above for description. AUX Over Current: AUX stands for Auxiliary output. This alarm indicates that there was a overcurrent condition on the AC AUX output. This could indicate that there is an internal problem, which is drawing too much current. Another possible condition is that the output load exceeds the maximum output rating, which caused the AUX output to shut down.

  • Page 35: Warranty

    MEGGER. MEGGER will, at its option, either repair or replace those parts and/or materials that it deems to be defective. Any costs incurred by the purchaser for the repair or replacement of such parts and/or materials shall be the sole responsibility of the original purchaser.

  • Page 36: Test Applications

    TEST APPLICATIONS The SR-98 unit is designed for shop or field testing of protective relays, auxiliary relays, molded case circuit breakers and overload coils. Other test applications include thermal or magnetic motor overloads, in-line motor cutouts, relay coils, panel board ammeters and voltmeters and ratioing current transformers.
  • Page 37 Increase the DC voltage output by rotating the Control Knob until proper logic voltage is applied. If the relay is AC voltage controlled/restrained, see VOLTAGE RELAY Test for typical tests on the AC voltage control/restraint element. Pickup Test: AC AMPERES should already be highlighted. With MODE SELECT set to MAINT.
  • Page 38 typical normally open contact timing test are as follows, Select Start Option to INITIATE. Select Stop Option to N. OPEN (Normally Open). Select Start and Stop Latch ON. Press PREV SCREEN. Press the INIT Button. The current turns ON at the value set in Momentary mode.

  • Page 39: Instantaneous Element Of Overcurrent Relays

    INSTANTANEOUS ELEMENT OF OVERCURRENT RELAYS From the TEST MENU Screen, select CURRENT RELAY. The following test screen should be displayed. Connect Relay Trip contacts to STOP/MONITOR gate. Connect the appropriate AC CURRENT MAIN output tap to the Current Coil (see SELECTION OF OUTPUT TERMINALS, CURRENT MAIN for guide to proper selection).

  • Page 40: Dc Target And Seal In

    Timing Test of Instantaneous Overcurrent Element To time the instantaneous element, repeat steps 7 through 14 for Timing Test, TIME DELAY OVERCURRENT DEVICES above. DC TARGET AND SEAL IN Many different types of relays use DC target and seal-in coils. This test procedure applies to those types of relays.

  • Page 41: Impedance Relay

    IMPEDANCE RELAY: The IMPEDANCE RELAY Test Screen is used to test all single-phase distance, impedance, or three-phase impedance relays (where the voltages may be paralleled and currents series). From the TEST MENU Screen, select IMPEDANCE RELAY. The following test screen should be displayed. Connect Relay Trip contacts to STOP/MONITOR gate.
  • Page 42 Knob, rotate the phase angle to the desired angle (note current lags voltage). Using the arrow key, highlight either AC AMPERES or AC VOLTS. Using the Control Knob, decrease the AC Volts (or increase the AC Current) until the TRIP LED turns on.

  • Page 43: Voltage Relay

    VOLTAGE RELAY: The VOLTAGE RELAY Test Screen is used to test all single-phase AC under and overvoltage relays. From the TEST MENU Screen, select VOLTAGE RELAY. The following test screen should be displayed. Connect Relay Trip contacts to STOP/MONITOR gate. Connect DC AUX output to relay (for solid state or microprocessor-based).
  • Page 44 VOLTAGE RELAY TIMING TEST With the relay properly connected to the test set (see connections above) press the AC AUX Button to turn the AC output voltage on. The “fault” voltage is set first. Increase the “fault” voltage to the relay by rotating the Control Knob.

  • Page 45: Directional Relay

    DIRECTIONAL RELAY: The DIRECTIONAL RELAY Test Screen is used to test all single-phase directional overcurrent, ground directional overcurrent, or relays which have a directional supervisory element which is sensitive to single-phase current and voltage. From the TEST MENU Screen, select DIRECTIONAL RELAY. The following test screen should be displayed.
  • Page 46 and the AC AUX Output. It displays Current lagging Voltage. Since some directional elements are tested with current leading the voltage, simply subtract the angle indicated from 360 to get the appropriate leading angle. For example, if the test is to be conducted at 30 degrees current leading voltage, set the phase angle to 330 degrees (330 current lags voltage equals 30 degrees current leads voltage).

  • Page 47: Power Relay

    POWER RELAY: The POWER RELAY Test Screen is used to test single-phase over power, reverse power or synchronous motor loss of excitation relays. In addition, some three-phase relays may be tested with the potential coils paralleled and current coils in series. From the TEST MENU Screen, select POWER RELAY .
  • Page 48 Rotate Control Knob and increase current until the desired test current is set. φ Note the phase angle displayed, I lags V . The relay may be tripped at this point depending on the measured phase angle displayed. The phase angle display is the measured phase angle between the AC CURRENT MAIN output and the AC AUX Output.
  • Page 49 Timing Test: Preset Fault Current: Repeat steps 1 through 4 for the Power Directional Pick up Test. Pressing the MODE SELECT button, change from MAINT (Maintain) to MOM. (Momentary) Press the INIT Button. The output current should turn on for a short pulse duration.

  • Page 50: Sync (Synchronizing) Relay

    SYNC (Synchronizing) RELAY: The SYNCH RELAY Test Screen is used to test synchronizing and sync check relays. It may also be used to test reverse phase, or phase sequence voltage relays, which can be tested using an Open-Delta test potential (see Testing Phase Sequence Undervoltage Relays ).
  • Page 51 Pick Up and Drop Out Test: Press the INIT button to turn on the AC VOLTS (M) voltage source. Rotate Control Knob until rated voltage appears on the AC VOLTS (M) display. Using the arrow key, highlight the AC VOLTS (AUX). Press the AC AUX button to turn the AC Volts on.
  • Page 52 Timing Test: Preset Fault Current: Repeat steps 1 through 6 for the Sync Relay Pick up Test. Pressing the MODE SELECT button, changes from MAINT (Maintain) to MOM. (Momentary) switching off the AC MAIN voltage. Adjust AC AUX voltage to rated value. Pressing the MODE SELECT button twice to change from MOM.

  • Page 53: Reclosing Relay

    RECLOSING RELAY: From the TEST MENU Screen, select RECLOSING RELAY . The following test screen should be displayed. Connect relays’ reclosing and lockout contacts to STOP/MONITOR gate. Connect the RECLOSING RELAY , B (Normally Closed) contacts to the relays’ breaker sensing input (52B Contacts).

  • Page 54: Dc Relay

    Select Stop Option to N. OPEN (Normally Open). Press PREV SCREEN. Press the INIT Button. The test set closes the 52A contacts, and opens the 52B contacts. Each time the relay closes it’s contacts the reclose time is recorded and displayed. The test set delays the contacts for approximately 800 ms between each operation.
  • Page 55 Timing Test: There are two timing tests: Contact Close Timing Test Drop out Timing Test Contact Close Timing Test: With the DC AUX output OFF and properly connected to the relay potential coil, parallel the DC AUX output terminals to the TIMER START gate. Connect Trip contact to TIMER STOP gate.
  • Page 56 Drop Out Timing Test: Repeat steps 1 through 3 of the Contact Close Timing Test. Press the TIMER SETUP Button. The following screen should appear. Select Start Option to V. REMOVED (Voltage Applied). Select Stop Option to N. CLOSED (assuming Normally Closed trip contacts). Select Start and Stop Latch ON.

  • Page 57: Metering Functions

    Function buttons allow the user to select either Amperes AC or DC and Volts AC or DC. The METERING Screen allows the SR-98 to measure external voltage and current, as a multi-purpose single-phase meter. AC or DC voltages up 600 Volts and AC or DC currents up to 6 Amperes may be measured.

  • Page 58: Timer

    TEST PROCEDURE There is literally hundreds of testing applications for the timer. Megger could suggest various procedures, but correct method of timing devices depends entirely on the recommendations of the manufacturer of the device and the preferences of the operator.
  • Page 59 Select the desired Start Option i.e., N. OPEN (Normally Open). Select the desire Start Latch, ON (Normally ON). If it is desired to use the reversal of the Start signal to stop the timer (such as timing the closing and opening of a single contact, when measuring the trip-free operating time of a circuit breaker) switch the Start Latch OFF.

  • Page 60: Testing Current Differential Relays

    Restraint Test. Many electromechanical relays also have dc target and seal-in element that need to be tested. Partial tests can be done using just one SR-98, Pick-up, Timing, Instantaneous Pick Up and DC seal-in. To completely test current differential relays, requires two SR-98 units operating together as Master / Slave, see SELECTION OF MASTER UNIT for interface instructions.
  • Page 61 Read and record the Pick-up current. Return the current to zero. Turn off the AC CURRENT MAIN by pressing the MODE SELECT button (changes the output to Momentary Operation). Repeat the test for the other Restraint Element(s). Timing Test: Connect the appropriate AC CURRENT MAIN output terminals to the relay terminals so that the test current will energize one Restraint Coil (Element) and the Current Operating Coil (Element).
  • Page 62 TIME DELAY OVERCURRENT DEVICES. Slope (Differential Characteristic) Test: The Slope (Differential Characteristic) Test requires two SR-98’s operating in Master/ Slave mode, see SELECTION OF MASTER UNIT. Select one unit to be Slave unit. The Master unit INIT button controls both the Master and Slave AC CURRENT MAIN outputs.
  • Page 63 Connect Relay Trip contacts to STOP/MONITOR terminals. Note: If relay is solid state, microprocessor-based, or has a DC auxiliary relay that requires a DC voltage prior to applying test currents, connect the appropriate relay terminals to the Master Unit DC AUX terminals. With the arrow key, highlight the DC VOLTS and press the DC Button.
  • Page 64 Harmonic Restraint Test: The Harmonic Restraint Test requires two SR-98’s operating in Master/ Slave mode, see SELECTION OF MASTER UNIT. Select one unit to be Slave unit. The Master unit INIT button controls both the Master and Slave AC CURRENT MAIN outputs. It also establishes the in-phase relationship between the two currents.
  • Page 65 Using the cursor key, cursor down to Out Freq:. Depending on the model number of the SR-98, the defaulted frequency may be either 60 Hz or 50 Hz. To change the output frequency, rotate the control knob until the desired harmonic is displayed.
  • Page 66 Formula for Westinghouse Type HU Relay % 2 nd Harmonic Restraint: Harmonic Restraint = __1.2267 * 2 nd Harmonic_Current_ * 100 √ ( Fundamental) + (2nd Harmonic) For example, a Westinghouse type HU, harmonic restraint relay, set for a 15 % harmonic restraint, might have typical values of 1 Ampere 2 nd Harmonic Current (Slave Unit) and 8.2 Amperes Operating Current (Master Unit).

  • Page 67: Testing Phase Sequence Undervoltage Relays

    Similar relays can be tested using the same basic procedure. For relay specific test guides relative to testing these types of relays, see the Megger web site at avointl.com. Click on Products, Relay Test Equipment then on Application Guides.
  • Page 68 be displayed. Test Connections: Connect the relay High Voltage Closing contacts to STOP/MONITOR gate. Connect the 230 V / 4 A, AC CURRENT MAIN to the Relay A Phase potential coil and the COMMON return to Relay B Phase potential coil. Connect the AC AUX red output terminal to Relay C Phase potential coil and the Black COM (common) return to Relay B Phase potential coil.
  • Page 69 Phase Sequence Test: With the outputs still on from the High Voltage Contact Pick Up Test, reduce the test voltages to a value that is half way between the high voltage and low voltage pick up values. The moving contact should be “floating” between the two stationary contacts. Using the arrow key, highlight the phase angle displayed (300 degrees).
  • Page 70 Over Voltage Timing Test: Test Connections: Use same test connections as for the High Voltage Pick Up Test. Preset Over Voltage Test Voltage: Repeat steps 1 through 5 for the Pick Up High Voltage Contacts Test. Adjust both voltages up to the desired test voltage for timing, i.e., 110% of pickup. Switch off the AC MAIN by pressing the MODE SELECT button changes from MAINT (Maintain) to MOM.
  • Page 71 Low Voltage Timing Test: Test Connections: Connect the relay Low Voltage Closing contacts to TIMER STOP/MONITOR gate. Connect the High Voltage Closing contacts to the TIMER START gate. Preset Test Voltage: Note: The timing test for under voltage requires a voltage slightly higher than the High Voltage Pick up value to be set.

  • Page 72: Molded Case Circuit Breakers

    Select Start and Stop Latch ON. Press PREV SCREEN. Press the TIMER RESET Button. Press the INIT Button. The AC MAIN turns ON. When the High Voltage contacts close, AC MAIN output turns OFF, and the timer starts. When the Low Voltage contacts close the Timer Stops. Record the Low Voltage Closing Time.

  • Page 73: Timing Test Of Molded Case Circuit Breakers

    TIMING TEST OF MOLDED CASE CIRCUIT BREAKERS Note that the highest rated output terminal on the SR-98 is 115 Amperes. The suggested test current is three times (3X) the normal current rating of the circuit breaker. Therefore, the largest molded case breaker that the unit can test is approximately 35 Amperes.
  • Page 74 Some types of circuit breakers are intended to trip only under high-current fault conditions, usually ten times (10X) rated current. They have only instantaneous characteristics that require much higher test currents than the SR-98 can produce, and therefore cannot be tested using the procedure described above.

  • Page 75: Motor Overload Relays

    MOTOR OVERLOAD RELAYS Always refer to the manufacturer's literature applicable to the particular overload relay before testing. The test operator should be familiar with the operating characteristics of the relay, the tolerances applicable to the operating characteristics and the means of adjusting the relay, if any.

  • Page 76: Parallel Printer Port

    PARALLEL PRINTER PORT The printer port is located on the lower left-hand side of the unit, and uses a 25 -pin delta connector. To send data to the printer port, from any test screen simply push the PRINT SCRN (SCREEN) Button. The metered and/or calculated data on the screen will be printed similar to the screen presentation.

  • Page 77: Sr-98 Command Set

    SR-98 COMMAND SET The SR-98 incorporates an RS232 Serial Data Communications Port for communicating with a personal computer. This feature may be used to transmit data from the SR-98 to the computer for data analysis and report generation. The SR-98 can be programmed to change Menu Screens, Select a language, Setup the timer or Specify a relay to test, and Query the test set for metered or calculated values.
  • Page 78 From the Language Selection Screen: Selection Command English French Spanish German Portuguese Japanese From the Test Menu Screen: Selection Command Current Relay Distance Relay rdis; Directional Relay rdir; DC Relay rdc; Metering Voltage Relay Power Relay rpow; Synch Relay rsyn; Reclosing Relay rrecl;...
  • Page 79 Out Freq 16.66 Hz freq16; 25 Hz freq25; 50 Hz freq50; 60 Hz freq60; 100 Hz freq100; 120 Hz freq120; 150 Hz freq150; 180 Hz freq180; 250 Hz freq250; 300 Hz freq300; Mon Horn hornon; hornoff; Del Cycle 4 Cycles del4;...
  • Page 80 Field Selection Command MAIN MAIN CURRENT mmi; MAIN VOLTAGE mmv; AC AUX maux; DC VOLTS mdv; DC AMPS mdi; φ PHASE ANGLE mph; From Relay Test Screen: Function Selection Command Set Fault Set Fault Voltage msf;...
  • Page 81 Query Commands: Query commands are issued from any test screen, meter screen or timer screen. Individual values may be queried or all values, both metered and calculated. See the following query commands. Selection Command AC Current AC Voltage qva; DC Voltage qvd;...

  • Page 82: Specifications

    SPECIFICATIONS DESCRIPTION The Megger Model SR-98 is the newest addition to the long successful line of Megger “SR” series, like the SR-51, SR-76 and SR-90 relay tests. With almost 50 years of relay testing experience, the SR-98 incorporates the latest in Digital Signal Processor (DSP) and microprocessor-based technology to provide a powerful, easy to use relay test set.
  • Page 83 The user simply selects from a menu screen for different testing applications. For example see the TEST MENU below. As can be seen, the SR-98 can test a wide selection of relay types. The phase shift capability means that the unit can continuously adjust the phase angle relationship...
  • Page 84 between the voltage and current outputs. Therefore, values like reach, maximum angle of torque, directional balance points and closing angles can be easily tested. In addition, breaker contact simulation provides swift and easy testing of reclosing type relays. Other types of relays not specifically listed on the menu above can be tested using one of the menu selections.
  • Page 85 Saves time in making test connections. Multi-purpose test system saves money. • Phase shift capability (0 to 359.9 ° ) - The SR-98 provides phase shift between the main ac current and auxiliary ac voltage outputs (for testing complex relays), or between the 230 volt output terminal of the main ac current and the auxiliary ac voltage outputs (for testing synchronizing and phase sequence relays).
  • Page 86 The user simply selects from a menu screen for different testing applications. For example see the TEST MENU below. As can be seen, the SR-98 can test a wide selection of relay types. The phase shift capability means that the unit can continuously adjust the phase angle relationship between the voltage and current outputs.
  • Page 87 AC Main Output Current The main AC current output is rated for 920 VA, with four different output terminals continuously adjustable in the following ranges: Output Current Full Load Voltage 0 - 4 Amperes 230 Volts 0 - 10 Amperes 90 Volts 0 - 45 Amperes 20 Volts...
  • Page 88 AC/DC Output Voltage Duty Cycle 30 Minutes on followed by 30 minutes off. Metering Measured quantities such as AC Amperes, AC Volts, DC Volts or DC Amperes, and Time, are all simultaneously displayed on the large variable contrast LCD screen. The read-and-hold feature of the metering provides fast and accurate preset of test values.
  • Page 89 Power (Auto Ranging) Ranges and Resolution 0 to 4 kW in 6 ranges, with 0.1 % resolution Accuracy: ± 1.5 % of VA, ± 1 digit Reactive Power (Auto Ranging) Ranges and Resolution 0 to 4 kVAR in 6 ranges, with 0.1 % resolution Accuracy: ±...
  • Page 90 MEGGER Models EPS-1000 or PVS-1000 for phase reference. This will allow testing of more complex relays, which require phase shifting between a three-phase voltage output (EPS-1000) and a current output (SR-98). Temperature Range 32 to 122 ° F (0 to 50 ° C) Operating:...
  • Page 91 Line cord, North American (Model SR-98-1/60) (1 ea.)............. 620000 Line cord, Continental Europe (Model SR-98-3/50) (1ea.) ............50425 Line cord, International (Model SR-98-2/50 ) (1 ea) ..............51874 Instruction Manual (1 ea)......................51187 15 A Input Fuse, (for 120 Volt input) (5 ea.) T rated ..............

  • Page 92: Parts List

    PARTS LIST SR-98 Description Part No. Line Filter 51631 Keypad 51614 Resistor, 2A, 23 OHM IL81 Resistor, 10A, 1.88 OHM FL72 Resistor, 15A, .94 OHM FL73 Fuse, Reset 50623 Transformer, Current 12629 Input Power Receptacle 51447 Knob, Control 50615 Power Switch...

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