LV Node

TRANSFORMER STATION MEASUREMENTS

The LV-PA34 device performs supply-point measurements on the secondary side of the MV/LV transformer and transmits the data via a communications modem to the data center. Supply-point measurement involves measuring three voltages and three (or optionally four) currents. In addition to generating its own measurement data, the LV-PA34 can communicate with further proprietary or third-party devices and transmit their data as well.

TRANSFORMER STATION BRANCHING MEASUREMENTS

The LV-NODE product family's supply-point central unit, the LV-PA34, can be expanded with additional Prolan-manufactured plug & play expansion modules. This solution makes it possible to monitor multiple branches originating from a single transformer without installing multiple modem-equipped units. The LV-PMxx devices measure branches current and power, while the LV-VMxx devices check for voltage presence.

END-POINT MEASUREMENTS

Within the LV-NODE product family, the LV-VA3 device is the modem-equipped option for voltage measurement at line endpoints. Its feature set is similar to the LV-VA34, but given its intended installation environment, it cannot be expanded with additional modules and does not measure current. As a result, it has a much simpler, more efficient design and installation process.

MAIN FEATURES

• Power quality measurements according to EN 50160, EN 61000-4-30, and EN 61000-4-15
• Voltage measurement accuracy of 0.5%, current measurement accuracy as low as below 1%
• Three-phase voltage measurement with an internal fuse
• Three-phase (optionally four-wire) current measurement using a Rogowski sensor
• Changeable current sensors with IP65 connectors
• LTE 4G communication with either an integrated or external antenna, depending on the model
• Optional GPS location and time synchronization
• Support for multiple IoT protocols (e.g. MQTT, Microsoft Azure)
• Remote configuration and firmware updates
• Up to five minutes continuous measurement and communication in case of power failure
• Operation from a single active phase if needed
• LED status indicators on the device front panel
• UV-resistant, IP65-rated enclosure
• Installation without opening the device enclosure
• Live installation possible (no power shutdown required)

MEASUREMENTS

Periodically Generated Data (Statistics):

• Average, minimum, and maximum for each measured quantity
• Configurable cycle time in minute resolution
• Voltage and current RMS
• Active, reactive, and apparent power
• Power factor
• Voltage and current THD
• Individual voltage and current harmonics
• Voltage and current asymmetry
• Mains frequency

Events, Alarms:

• Voltage dip
• Voltage swells
• Rapid voltage changes
• Overcurrent
• Voltage interruptions
• Medium-voltage line break
• Door opening

Other Data:

• Flicker Pst1 and Pst10