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Measuring Terminal MT-20S

Measuring terminal for measurement, monitoring, recording and analysis of power quality in generation and distribution systems

The MT-20S measuring terminal is designed for measurement, monitoring, recording and analysis of electrical quantities in power generation and distribution systems. Fast sampling computes true RMS currents, voltages, powers, energies, power factor and frequency, and analyses power quality in accordance with EN 50160 and the IEC 61000-4-30 Class S (Ed.3) standard.

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  • IEC 61000-4-30 Class S

    Power quality analysis per EN 50160 and IEC 61000-4-30 Class S (Ed.3): harmonics up to the 63rd, THD, voltage dips and swells, RVC, flicker and unbalance.

  • EN 50160

    Automatic generation of power quality reports in accordance with EN 50160, local view on the LCD display and remote view via the web interface.

  • Recording & storage

    Recording of measured quantities and waveforms on an SD card up to 8 GB with DBF export; optional MTU signal measurement and waveform recording.

  • Communication interfaces

    Ethernet 10/100, 2 x RS-232/RS-485 and mini USB

  • Communication protocols

    Ethernet 10/100, 2 x RS-232/RS-485 and mini USB

  • Energy metering by tariff

    Active and reactive energy metering by tariff (up to four tariffs) with peak, average and minimum values, time-stamped (built-in RTC).

  • Monitoring & control

    2–4 digital inputs and 2–4 digital outputs, optional analog I/O and temperature measurement, with a 320×240 colour LCD display.

Measurement inputs

Current inputs
3+1; rated current up to 5 A (autorange); range 0–1.5 IN
Voltage inputs
3+1; declared voltage up to 347 V (autorange); range 0.1–2.0 U
Sampling
256 samples/cycle

Accuracy & analysis

Accuracy – voltage / current
U: 0.2% MV; I: 0.2% MV (EN 61557-12)
Accuracy – power
P, Q, S: 0.4% MV
Accuracy – energy
EP: EN 62053-22, class 0.5S; EQ: EN 62053-24, class 1S
Harmonics
up to the 63rd harmonic; IEC 61000-4-7, class 1
Frequency
accuracy ± 10 mHz

Inputs & outputs

Digital inputs / outputs
2+2 inputs (option); outputs: 2 solid-state (100 mA/30 V) + 2 relay (220 V DC, 80 W) – option
Analog inputs / outputs
0–20 mA, 0–10 V (option); temperature measurement via 4–20 mA probe
MTU signal measurement
0–20% Un, 100–3000 Hz (option)

Data & display

MD interval
3 s – 1 h
Memory
SD card up to 8 GB (DBF export)
Display
colour graphic LCD, 320×240
RTC
± 1 s/24 h; battery ~ 5 years

Communication

Communication
10/100 Base-Tx(Fx) Ethernet (option); 2× RS-232/RS-485; optical (option); mini USB (host MSC, front panel)
Protocols
MODBUS TCP/RTU; HTTP; IEC 60870-5-101/104; IEC 61850 (option); DHCP
Synchronisation
SNTP, NTP, GPS

General

Power supply
100–350 V DC, 100–270 V AC (40–300 Hz); 18–36 V DC; 36–72 V DC; consumption < 8 VA
Temperature range
0…+50 °C (extended −20…+60 °C)
Insulation
2.5 kV, 50 Hz, 1 min
Protection
IP40 (front) / IP20 (rear)
Mounting & dimensions
panel, DIN 43700; 96×96×90 mm
  • IEC 61000-4-30 Class S
  • EN 50160
  • IEC 61000-4-7
  • IEC 61000-4-15
  • EN 61557-12
  • EN 62053-22 (class 0.5S) – active energy
  • EN 62053-24 (class 1S) – reactive energy
  • EMC/safety: HRN EN 61000-6-2/4, EN 61326-1, EN 61010-1/2
  • MODBUS TCP/RTU
  • IEC 60870-5-104 (option)
  • IEC 61850 (option)
  • PQDIF, COMTRADE (option)

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