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Megger multi-phase relay test system


  • SMRT410D
  • Overview  
  • Application  
  • Downloads  
  • Integrated Smart Touch View Interface.
  • Multi-colored graphics with intuitive navigation
  • Stand-alone operation, no PC required to operate
  • High current output - 60 Amps at 300 VA per phase
  • Flexible output design provides up to 10 currents
  • Dynamic, Transient and GPS Satellite Synchronized End-to- End Testing Capability
  • IEC 61850 Testing Capability

The SMRT410D is a multipurpose, light-weight, field portable test set capable of testing a wide variety of electro-mechanical, solid state and microprocessor-based protective relays, motor overload relays, and similar protective devices.

The unit can be operated either manually via the built-in touchscreen user interface, or placed under full computer control via the AVTS, Advanced Visual Testing Software, or the STVI-software running on a PC. In addition, with the open communication architecture, the unit can also be used with third-party software programs such as National Instruments LabVIEW™.

The built-in user interface, called the Smart Touch-View Interface™ (STVI), is Megger’s second generation of automatic / semi-automatic manual user interface software. It incorporates a large, easy to read full color, high resolution, high definition, TFT LCD touch-screen display, which displays metered values such as AC and DC Amperes, AC and DC Volts, and Time in both seconds and cycles. Depending on the type of test selected, other values may be displayed, such as Phase Angle, Frequency, Ohms, Watts, VA, or Power Factor.


The test system may be customized by adding the number of Voltage-Current, “VIGEN”, modules needed for specific test applications, with a maximum of 5 channels. For example, the SMRT410D with three VIGEN Modules provides complete three-phase testing of three-phase impedance, directional power, negative sequence overcurrent and other devices that require a three-phase four-wire wye connected source. Each current channel is rated for 30 Amps @ 200 VA continuous, and up to 60 Amps @ 300 VA for short durations. For testing relay panels or electromechanical relays, it has a unique flat power curve from 4 to 30 Amps that insures maximum compliance voltage to the load at all times. With a maximum compliance voltage of 50 Volts per phase, two channels in series provide 100 Volts to test high impedance relays. Five currents in parallel provides test currents up to 20 Amperes (1000 VA) for testing ground overcurrent relays at high multiples of tap rating. With only three currents in parallel it can provide up to 180 Amps at 900 VA for testing all instantaneous overcurrent relays. Each voltage channel can provide variable outputs of 0- 30/150/ 300 Volts at 150 VA of output power. Automatic range changing is done on-the-fly and under load. For testing a panel of relays, or older electromechanical impedance relays, it has a unique flat power curve from 30 to 150 Volts insuring maximum output power to the load at all times. With the voltage channels converted to currents, a three channel unit can provide 6 currents for testing three phase current differential relays, including harmonic restraint transformer differential relays. With 5 channels the unit can provide up to 10 currents for testing bus differential, or 9 currents for three-winding transformers, without having to move test leads. MANUAL OPERATION The Smart Touch View Interface™ (STVI) touch screen allows the user to perform manual, steady-state and dynamic testing quickly and easily using the Manual or Sequencer test screens, as well as using built-in preset test routines for most popular relays. Ergonomically designed with the control knob, and the touch screen, the powerful STVI-software is extremely easy to use. DESCRIPTION The most significant feature of the STVI software is its ability to provide the user with a very simple way to manually test, for both commissioning and maintenance, from the simple overcurrent relay to the most complex relays manufactured today. Manual operation is simplified through the use of a built-in computer operating system and the touch screen. The STVI eliminates the need for a computer when testing virtually all types of relays. Enhanced graphics, intuitive menu screens, and touch screen icon buttons are provided to quickly and easily select the desired test function. MANUAL TEST SCREEN In the following Manual Test screen the pre-selected outputs are set using the touch screen. Power-up preset default values maybe automatically set from the user defined configuration screen. The user can select from a variety of test options including manual control using the control knob, a dynamic sequence of tests to include trip and reclose operations, an automatic ramp, pulse ramp, or pulse ramp binary search to determine pickup or drop out of relay contacts, or perform relay specific timing tests. By pressing the on button, the selected output indicators will change color indicating which outputs are energized. A vector graph indicates the relative phase angles of all the outputs, or the user can select to see the positive, negative, and zero sequence vectors displayed. The user may select to have all output amplitudes metered to provide real time verification of all of the selected outputs, or have setting values displayed. In the Manual Test Screen the user can set Prefault and Fault values. The user can toggle back and forth between the two values to monitor contact activity. To do a simple timing test the user can set Prefault time duration in seconds, and then press the Blue Play button. The Prefault values will be applied for the Prefault time, then change to the Fault values and start the Timer running. When the relay trips, it will stop the timer, and may turn selected outputs off depending on the user defined Auto-Off configuration. The test results may be saved to the internal memory to download later into a larger database for record keeping. In the Advanced manual test screen, the user can define up to four waveforms, the default 1 (Fundamental), plus a Second (2), Third (3) and Fourth (4) Waveforms. All four waveforms will be summed together to create a harmonic waveform. Individual harmonic amplitudes and phase angles are easily adjusted. This feature is normally used when generating a second, third or fifth harmonics when testing harmonic restraint transformer differential or generator neutral protection relays. AUTO RAMP, PULSE RAMP AND BINARY SEARCH FEATURES The STVI software may be used to automatically determine pickup or dropout of various types of relays. Pressing the Auto Ramp button presents three choices; Step Ramp, Pulse Ramp, and Pulse Ramp Binary Search. The first selection, Step Ramp, will ramp the output by applying a value and then waiting a specific amount of time before incrementing. To automatically ramp output current the user will select the channel to be ramped, set Start and Stop Amplitudes, an Increment (A), and a Delay time in Cycles (B). Pulse Ramp will start at user defined prefault condition, increment up or down returning to the prefault condition between each increment. Instead of Delay time the user sets the Pulse Cycles time, which applies the fault value to the relay for the specified time. The user can select a 2nd, 3rd and 4th ramp if desired, changing the size of the increment with each ramp. This feature is most used when doing instantaneous pickup tests. The output current, or voltage, can be incremented in large steps getting to the pickup point quickly, and then reduce the size of the increment to zero-in on the pickup value. This reduces the test time, heating of the relay under test, and provides a very accurate test result. This feature is also used when testing multi zone distance relays using three phase voltage and currents. Set the Pulse Cycles duration just long enough for the intended zone to operate. If you are not sure exactly where the pickup value of the relay is, you can use the Pulse Ramp Binary Search feature. TIMING TEST FEATURE Pressing the Time test button on the test menu list, the user is presented a menu of relays to test. Built-in timing tests are provided for a wide variety of protective relays, including Overcurrent, Voltage, and Frequency relays. To make it even easier and faster, the STVI-software has ANSI, IEC, and IEEE Standards time curve algorithms built-in. The STVI-software also includes time curves and time curve algorithms for hundreds of specific relays. The user can select from a pull-down list of different manufacturers (20 different manufacturers and growing), then select the relay model number, and/or curve shape (inverse, very inverse, definite time etc.). The list includes relay manufacturer’s digitized log-log, and semi-log, electromechanical relay time curves. Therefore, tests are conducted using the manufacturer’s actual time curve. In the following example, the G.E. IAC-51B relay with a 1 Amp Tap and a number 2 Time Dial was selected. By entering the appropriate values in the setting screen, when the timing test is conducted, the test results will automatically be plotted and compared to the theoretical values from the relay specific time curve that was selected. Up to 8 test points may be selected. If the test Multiple is changed, the appropriate theoretical trip time will change automatically. VIEW TEST REPORTS To view the test result, press the Add Results to Report and View button. The user can now enter appropriate information relative to the test in the Test Report header. See the following example report. Note that the software automatically compared the Operating Time to the theoretical and made a Pass Fail determination based upon the manufacturer’s time curve characteristic. If the recorded test point(s) is out of specification it appears red in color. If it is within specification it will be green in color. This provides excellent visual As Found reporting. If the data is imported into PowerDB, reports can be generated that summarize the comments and failures of every test you perform for future NERC reporting requirements. STATE SEQUENCE TIMING TEST FEATURE Pressing the State Sequence button on the test menu list takes the user to the Sequence Timing Test Screen. There are up to 15 programmable steps available in the Sequencer Test Screen. By default, 9 states are already labeled as Prefault, Trip1, Reclose 1, etc. up to Lockout in step 9. Therefore, it is initially setup for a four shot trip, reclose to lockout scenario. The user is free to change the labels, or use the default labels. With each state the user may input values of voltage, current, phase angle, frequency and set the Binary Input sensing for each state. Both single pole and three pole trip can be simulated. There are default values and binary settings for a single phase trip and reclose scenario already programmed in. The user can either use the defaults or change them to suit the application. The Total Time to Lockout is also included in the setting and indicates where the total timer starts and stops. This allows for 1, 2, 3, or 4 shots to lockout including trip and reclose times. The user can set conditional settings such as Wait IRIG time setting (for End-to-End tests), Wait milliseconds, Wait cycles, Wait any contact (OR), and Wait all contacts (AND). The user can set the Binary Outputs to simulate the 52a and/or 52b contacts. Once all of the Binary Inputs, Outputs, Prefault, Fault and Reclose settings are completed, the user can then press the Preview button to get a visual representation of the voltage and current outputs, as well as a visual of the binary inputs and outputs for each stage of the simulation. The following figure illustrates a sample sequence. IMPEDANCE RELAY CLICK-ON-FAULT The all new Click-On-Fault (COF) is one of the choices in the test menu list. The new COF provides automatic tests of Impedance (distance) relays. It includes Ramp, Pulse Ramp, Pulse Ramp Binary Search, and Shot test capabilities. Selection of Relay Operating Characteristics Select from one the predefined generic relay characteristics of MHO, Half MHO or QUAD (Quadrilateral), or import a RIO file supplied by a number of relay manufacturers, or select from the relay specific Relay Library files. The Relay Library includes distance relays from SEL, GE, AREVA, and ABB. There are numerous other library test files which are still being tested and field evaluated. Therefore, as new relay library files become available a new version of the software will be posted to the website for free download. DEFINITION OF OPERATING CHARACTERISTIC AND TESTS There are several new innovations in the new COF that make testing distance relays easier and faster. For example, selecting the Generic MHO characteristic provides the following user input screen. Here the user selects which Zone (up to 6 zones may be defined), type of fault, direction, tolerance values, inputs the reach, max torque (line) angle; any offset, or load encroachment settings. The software draws the operating characteristic(s) of the relay defined by the user settings. The user may select to view single zone or multiple zones. Pressing the green check button takes the user to the COF test setup screen, as shown in the following figure. CREATING SEARCH LINES OR TEST POINTS The user can easily define up to 10 search lines or test points per fault type, per zone. Test options include; The Independence Test option provides maximum freedom to the user to select any test line, at any angle, around the operating characteristic. The Origin Test option the user clicks a point outside the operating characteristic, and the test line will be drawn to the origin or the intercept of the R and X axis. The Shots Test Points option is used to create one or more test points, each to replicate a fault at a particular magnitude and angle. This type of test provides a quick GO, NO/GO test of the relay after a settings change. The user does not even have to draw the test lines. There are two Quick Test Options the user may select. The first option draws three test lines for any of the selected Quick Test solutions. The second Quick Test the user may select the desired number of test points by pressing the Test Points button and select from the list. If none of the standard phase rotations meets the user’s needs, they can enter the desired phase rotation in the window provided. IEC 60255 TEST OPTION To comply with regulations which require testing to the IEC 60255 standard, the IEC 60255 option is also provided. All defined test lines will automatically be drawn perpendicular to the relay operating characteristic. PREFAULT SETTINGS For testing relays which require a prefault load condition, the user can set the prefault load voltages and currents. This is normally used when testing accelerated tripping or dynamic over-reach characteristics. PERFORMING TESTS The user then simply presses the blue Play button and the test begins. To save even more time the user can select the Play All button and the software will automatically test all define zones and faults in sequence. Based upon the user input the software will calculate all of the fault values and angles for each defined test point, and then make PASS/FAIL determination of the test results. A real-time test screen will display the relay operating characteristic with the defined test lines in the right half of the screen with the test vector moving in the impedance plane, and in the left half it will display either the test vectors of voltage and currents being applied in real-time, or it will display the Positive, Negative and Zero Sequence vectors being applied, see the following example. NEW TRANSFORMER DIFFERENTIAL TEST FEATURE The Transformer Differential Test feature provides automatic tests of three phase Transformer Current Differential relays. It includes Stability, Pickup, Timing, Slope, Harmonic Block and Harmonic Shot tests. TRANSFORMER MODEL AND NAMEPLATE SETTINGS There are two transformer differential models to choose from, ANSI and IEC. Each model will present a transformer graphic commonly used either for North American or European style transformer protection. The values entered in the Transformer Nameplate section will determine what values of current and phase angle relationships get applied to the relay in the tests. DEFINITION OF SLOPE CHARACTERISTICS AND TESTS There are several new innovations in the new Transformer Differential Test feature that make testing three phase transformer differential relays easy and fast. For example, the slope characteristics vary by manufacturer design. Four options are provided, which cover the various designs; Line Segments, Slope Through X Axis, Slope Through Origin and Slope From Base Point. In addition, different relay manufacturers use different IBias equation methods for restraining the operation of the differential elements. The Transformer Differential Slope test provides seven different biasing (restraint) equations to choose from. Touch the STVI screen to create test lines associated with the slope characteristic. The following is an example test being performed with four test lines.