APPLICATIONS:

The list below is the possible applications for the STR Units. Click the appropriate button to get more details on the twelve applications.

1. Weather Station2. Power Quantities monitoring3. Power Quality monitoring4. Lightning data & Waveform5. Fault data & Waveforms6. Real time Thermal Ratings7. Line Sags8. Line De-Icing & Prevention9.Tower Tilt/Broken Conductor10. Circuit Re-Configuration11.Capacitors, Regulators & DG's12.Transient Data, Waveforms


12.Transient Data, Waveforms

Measurements:

Option B DSTR Units measure 23 parameters, and Option B and C TSTR Units measure 27 parameters.

  1. Option B DSTR Units

    1. Weather Data
      1. Ambient Temperature, ta
      2. Solar Radiation, Qs
      3. Effective Wind, Veff
      4. Relative Humidity, RH
      5. Barometric Pressure, P
      6. Rate of Rainfall, R (optional)
    2. Power Quantities
      1. Voltage, V, and waveform
      2. Current, I, and waveform
      3. P.F., θ, phase angle
      4. Real Power (kWatts)
      5. Reactive Power (kVAr)
      6. Volt Amperes (kVA)
    3. Faults
      1. Fault Current, If, and waveform
      2. Fault Voltage, Vf, and waveform
      3. Fault phase angle, θf
      4. Fault Direction
    4. Lightning Strokes
      1. Lightning Stroke Current, Il, and waveform
      2. Lightning Stroke Voltage, Vl, and waveform
    5. Line Data
      1. Line Sag, θp
      2. Conductor Temperature, tc

  2. Option B TSTR Units (includes the above a. through e.)

    1. Weather Data
      1. Ambient Temperature, ta
      2. Solar Radiation, Qs
      3. Effective Wind, Veff
      4. Relative Humidity, RH
      5. Barometric Pressure, P
      6. Rate of Rainfall, R (optional)
    2. Power Quantities
      1. Voltage, V, and waveform
      2. Current, I, and waveform
      3. P.F., θ, phase angle
      4. Real Power (MWatts)
      5. Reactive Power (MVAr)
      6. Volt Amperes (MVA)
    3. Faults
      1. Fault Current, If, and waveform
      2. Fault Voltage, Vf, and waveform
      3. Fault phase angle, θf
      4. Fault Direction
    4. Lightning Strokes
      1. Lightning Stroke Current, Il, and waveform
      2. Lightning Stroke Voltage, Vl, and waveform
    5. Line Data
      1. Line Sag, θp
      2. Conductor Temperature, tc
      3. Tower Tilt, θt
      4. Insulator Swing Angle, θs
      5. Conductor Vibration, A, f
    6. System Data
      1. Synchro Phasor
      2. Solar Storm Data

    Calculations:

    Calculations are made for % unbalance current, % unbalance voltage, total harmonic current distortion THDi, total harmonic voltage distortion THDv, line sag, thermal ratings of lines and other relevant parameters such as τcrit, Imax, and fcrit.span. In addition, ice prevention current, de-icing current as a function of time, and lightning stroke energy are calculated. 

    Applications:

    Most of the common occurring transient conditions such as motor starts, capacitor switching, lightning strokes, switching surges, ferro-resonance, faults, solar disturbances, etc., can be tracked down and evaluated using the (23) measured parameters of the DSTR, and the (27) measured parameters of the TSTR Units, respectively.

    Benefits:

    The cost of making the measurements and conducting the above studies of line phenomena can be quite expensive if the instrumentation is to purchased and installed on lines for a period of time to catch a somewhat elusive event, such as solar storms, and even more frustrating is when the event does not re-occur at all during the measurement period. DSTR and TSTR Units can be installed within minutes to hours and can remain at one location or moved to multiple locations over a period of many years at a negligible cost compared to the hardwired instrumentation that STR Units replace. The instrumentation that would need to be purchased may not even be available at any price because much of it would have to be developed.