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      Low-voltage line monitoring terminal unit
      WSL100
      The low-voltage line monitoring terminal unit (Hereinafter referred to as LTU) is mainly used for status monitoring of key nodes (outlet lines, cable branches and meter boxes) of low-voltage distribution substation distribution lines. LTU supports local sampling, energy measurement (used for line loss calculation and analysis of substation line segments), automatic identification of electrical topology, active reporting of power outages and restoration alarms, access to switch quantity monitoring, local integration of acquisition terminals, and other functions. It can also be expanded according to the actual application scenarios on site. The power line carrier and micropower wireless module are used for local communication between the LTU and smart transformer terminal unit(TTU).
      Main functions and characteristics

      1) Measurement function

      Electrical parameter measurement: It can measure the three-phase voltage, current, active power, reactive power, power factor, phase angle, frequency, total active power, and total reactive power of A, B, and C.

      Power quality measurement: It can measure the 2-21st harmonic content and total harmonic content of A, B, and C three-phase voltage and current, and calculate the voltage qualification rate.

      Cable temperature measurement: It can measure the temperature of three-phase cables A, B, and C.


      2) Energy monitoring function

      Energy monitoring: It can monitor the total import and export of A, B, and C active energy, as well as the reactive energy in the four quadrants.


      3) Load freeze

      Freeze various electrical parameters and energy for 15 minutes.


      4) Daily freeze

      It can record the energy data of the last 31 days.


      5) Event record

      It can record the last 10 events such as overvoltage, undervoltage, overcurrent, and line overheating.


      6) Data collection function

      Meter data collection: The electrical measurement parameters and energy measurement data of the smart meter in the metering box can be collected through RS485.

      Environmental data collection: Temperature, humidity, water immersion and other sensor data installed in the meter box (nearby) can be collected through RS485.


      7) Topology recognition function

      By sending current fingerprints, automatic identification of low-voltage electrical topology is achieved, and in conjunction with TTU, the electrical network topology relationship of the substation is automatically generated.


      8) Event reporting function

      Active power outage reporting: Actively report power outage information when a power outage occurs.

      Active event reporting: Report switch status and fault type when an event occurs.


      9) Remote control function

      Supports 2-way remote control signal input and remote control: supports 1-way remote control signal output.


      10) Interface function

      It has an indication interface, local communication interface and remote communication interface.

      Technical parameter
      • Voltage
        AC 220V
      • Current
        120A, 200A, 250A, 400A, 630A, 800A
      • Uplink communication
        PLC or Micropower Wireless
      • Operating temperature
        -25℃~+65℃
      • Relative humidity
        ≤95%
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