Condition monitoring

• Provision of all voltages, currents, powers, power factors every 10/12 cycles
• Extended reactive power analysis
• Variance of system variables with time reference

Energy flow analysis

• Power mean-values with trend-analysis for preventing load-peaks
• Load profile storage with fluctuation range (min/max) per interval
• Active /reactive energy class 0.5S (HT/LT, demand/delivery), configurable resolution
• Further mean-values and meters with selectable base quantity

Power quality analysis

• Harmonic analysis acc. IEC 61000-4-7
• Assessment of voltage and current imbalance
• Phasor and phase sequence display for connection check
• Waveform display
• Optional disturbance recorder for PQ events (voltage dip, swell, interruption) acc. IEC 61000-4-30 Ed.3 with RMS1/2 and waveform recordings

Hardware option

Analog outputs ±20mA (2/4), Relay outputs (2), Digital inputs (4) active / passive, GPS time synchronization, Fault-current monitoring (residual or earth current), temperature monitoring (Pt100, PTC), IEC61850 or Profinet I/O

Communication

• Optional: Ethernet (Modbus/TCP, http/https, NTP, SFTP, SYSLOG), IEC61850, Profinet I/O, Modbus/RTU
• Scheduled data export to SFTP server (option Ethernet required)

Security (option Ethernet required)

• Flexible Role Based Access Control
• Encrypted communication via HTTPS
• Audit Log records all security related procedures, support for SYSLOG for transfer to central network monitoring server
• Client whitelist: IP address list for restricting authorized computers
• Digital firmware signature: Prevents that manipulated firmware gets into the device via update

Further features

• 3 current and 3 voltage channels with 0.2% accuracy, direct measurement or via transformers
• Measurement category 600V, CAT III (voltage), 300V,CAT III (current)
• Standard IOs: 1 digital output, 1 digital input/output
• Data logger with16 GB data memory (option)
• Sampling rate: 18kHz
• Monitoring and alarming via limit values and monitoring functions
• For panel mounting 96x96mm
• Identical operation as devices of the PQ/CU/DM series

Possible applications in power systems

• Acquisition and control of the present system state
• Monitoring of the operational behaviour
• Analysis of the power quality
• Determining load profi les and energy demand values
• Finding the variations of the system load
• Measurement before and behind frequency converters
• Recording of operating procedures

The version without display for top hat-rail mounting is intended for applications where no on-site display is needed. It provides the same functionality as a device with display has the same dimensions and connections and may be equipped with the same options.

APLUSVersion with LED display.