MEDCAL ST II three phase network analyzer

Advanced Voltage and Power Quality recording solutions

The MEDCAL ST II three-phase network analyzer is the optimal solution for large-scale, distributed voltage quality recording solutions. Covering all the requirements of EN 50160, it records the most common disturbances: voltage dips and swells including voltage profiles, voltage and current harmonics and voltage flicker.

Additionally it also supports all the common electric magnitudes: Voltage, Current, Frequency, Unbalance, Active, Reactive and Apparent Power as well as Active, Reactive and Apparent Energy.

MEDCAL STII is capable of storing more than one month of data under normal conditions using there commended default 10 minutes averaging period.

The instrument is powered via two independent safety leads. The internal power supply can accept AC voltages between 100 and 660V as well as DC voltage between 100 and 250V DC. In case of interruption the instrument is kept measuring for 10 seconds and after this period the recordings are saved into the internal memory. The recording will resume automatically once the power voltage returns.

Complete included software

With every MEDCAL ST II instrument a copy of MEDCALScope PC software is included at no additional cost. MEDCALScope allows a complete and exhaustive analysis of recorded data. It is possible to save the recorded data for later use, and export the data to other computer applications such as spreadsheets and word processors, as well as check compliance with EN50160 NV, PRDIST and other power quality standards and produce automated reports.

 

MEDCAL ST II Three Phase Network Analyzer Specifications

User interface characteristics
  • Graphical LCD display with backlight. Auto-power off function for longer life.
  • Six large and robust buttons for display and local configuration of the instrument. It is possible to operate the instrument with electric safety gloves.
  • Enclosure IP rating: IP-65 according to IEC 60529.
Voltage measurement
  • Input voltage (Phase-Neutral): max. 480V A ac
  • Input voltage (Phase-Phase): max. 830V ac
  • User-selectable nominal voltages:
    50/100V 64/110V 65/115V 69/120V
    72/125V 73/127V 100/173V 110/190V
    120/208V 125/217V 127/220V 133/230V
    139/240V 220/380V 230/400V 250/415V
    277/480V 347/600V 400/690V 480/831V
  • User-selectable electric topology:
    • Wye three-phase 4 wire: L1-N, L2-N, L3-N voltages and L1, L2, L3, N currents.
    • Delta three-phase 3 wire: L1-L2, L2-L3 and L3-L1.
    • Split-phase: L1-N and L2-N.
    • Single-phase: L1-N.
  • User-selectable voltage transformer primary: 1kV, 2.4kV, 3.3kV, 6.9kV, 10.0kV, 11.0kV, 13.8kV, 15kV, 23.0kV, 25.0kV, 30.0kV, 33.0kV, 34.5kV, 45.0kV, 69.0kV, 88.0kV, 138.0kV, 230.0kV, 345.0kV, 440.0kV, 500.0kV, 750.0kV
  • User-selectable voltage transformer secondary: 100V, 110V, 115V, 220V, 230V, 400V and 1000V.
  • Input Impedance: 600kΩ per channel, 1.2MΩ Phase-Neutral.
  • Voltage maximum error: 0.1%
Voltage quality parameters
  • RMS voltage: maximum, average and minimum for every interval.
  • Dips and Swells: duration and depth measured according to EN 61000-4-30 Ed. 2. Possibility of recording the RMS voltage of the recorded events.
  • RMS voltage profiles: triggered by Dips and Swells. Cycle-by-cycle recording, maximum duration 4 seconds.
  • Harmonics: up to order 50th according to EN 61000-4-7 and EN 50160:2001
  • VTHD measured according to EN 61000-4-7 and EN50160:2001
  • Flicker measured according to EN 61000-4-15 and EN 50160:2001
  • Frequency measured according to EN 61000-4-30 Ed. 2 and EN 50160:2001
  • Unbalance measured according to EN 61000-4-30 Ed. 2 and EN 50160:2001
Current measurement using flexible current sensors
  • Four sensors: L1, L2, L3 and N.
  • Input connector IP-68 waterproof
  • Nominal Current measurement: 50 / 180 / 600 / 2000A
  • Maximum Current measuring range: 2 x In: 100 / 360 / 1200 / 4000A
  • Current maximum error: 0.1% + Current probe error.
Current measurement using inductive current clamps
  • Four sensors: L1, L2, L3 and N.
  • Input connector IP-68 waterproof
  • Nominal current (In): 10Arms
  • Maximum Current measuring range: 15Arms
  • Current maximum error: 0.1% + Current probe error.
Power and Energy measurements
  • Power: Active, Apparent and Reactive/Non-Active. Maximum, average and minimum for every interval.
  • Energy: Active, Apparent and Reactive/Non-Active with daily load curve.
  • Real time readings of wattmeter values on display.
  • Flicker: Pst and Plt.
Recording, memory and storage
  • Automatic storage of recordings after 10 seconds of losing power supply (internal UPS)
  • Automatic power on and resuming of the recording after power supply return.
  • Memory partitioning: 8 individual measurement periods.
  • Pre-programming recording sessions: up to 8 recording sessions with pre-programmed start and stop time.
  • Averaging intervals: 1s, 2s, 5s, 10s, 30s, 1m, 2m, 5m, 10m, 15m, 30min, 60m.
  • Number of records and events: over 600.000 records. Duration depends on the selected topology and number of disturbances.
  • Under normal circumstances, the instrument can store over 90 days of measurements with 15 minute averaging interval, and over 60 days of measurements with 10 minute averaging interval.
  • Type of memory: Internal Flash-type memory (circular or linear modes selectable).
  • Sampling frequency: 10.24Hz
  • Sampling resolution: 16 bits with adjustable amplification stage
  • Power supply level: 70 to 300 Vac, 70 to 250Vdc. Optionally, 70 to 600 Vac range.
  • Power supply frequency DC or AC: 50-60Hz.
  • Power consumption: 3.1W
  • RTC precision: 5ppm (error below 0.5 seconds per day).
Communications
  • USB 2.0 as standard. Certified drivers for Windows XP, 7, 8 and 8.1, both 32 and 64 versions.
  • USB effective data transmission speed: 1Mbps
  • Optional Bluetooth wireless interface for remote communication.
  • Bluetooth effective transmission speed: 100kbps.
Dimensions and weight
  • 151 x 101 x 60 mm
  • 900 gr.
Safety
  • Installation category: 600V CAT III / 300V CAT IV.
  • Pollution degree: 2.
  • Isolation level: double isolation.
  • Safety standard IEC/EN 61010-1