Model 1250-LTC

Model 1250-LTC

The Model 1250-LTC provides critical LTC Maintenance Data to assist in making informed decisions, while continuing to provide highly accurate local and remote indication of load tap changer position.

Applications

  • Transformer Load Tap Changer Position
  • Works in virtually all transformer LTC's
  • Single Phase Voltage Regulator Position
Product Information
Order & Spec Info
Downloads
  • Capabilities

    • Provides absolute position feedback
    • Tap Change Displacement (position variation, 0.1 degree resolution)
    • Total Operations Count
    • Number of Tap Changes “up to” or “down to” each Tap
    • Number of Consecutive Tap Changes in one Direction
    • Number of Days Since First or Last Change to Highest and Lowest Tap (Draghands)
    • Number of Days Since Passing Through Neutral
    • “Unstable Signal” and loss of signal detection
    • Momentary Relay Acknowledgement at Each Tap Change
    • High Tap and Low Tap Alarm Limits

    Features

    • Interfaces with PLC’s and PC-Based SCADA systems
    • Elapsed Time Clock
    • Full Duplex RS-232 Serial Communication or Addressable RS-485 Multi-Drop Communication
    • Programmable via the Serial Port
    • 2ea, Form A Dry Contact Relays
    • Proportional Stepped Analog Output
    • ASCII or MODBUS Protocols
    • Highly Visible 5 Digit LED Display
    • Small size fits in 1/8 DIN panel cut-out

    Benefits

    • Maintenance Free
    • Can be retrofited to older LTC’s with existing synchros
    • Easy Installation and Programming
    • Flexible Communication Options
  • Ordering Information

    1250-LTC-U-W-Y = Options, see below
    U = Output Options0
    1
    2
    4
    = 0-1 mA
    = ±1 mA
    = 0-2 mA
    = 4-20 mA
    W = Control / IsolationR
    I
    = Hi/Lo Relay Limits
    = Input Isolation
    Y = Comm. OptionsS
    M
    = RS-232 Serial
    = RS-485 MODBUS

    Specifications

    GENERAL
    Input SignalSynchro (5 wire) 90 V maximum
    Resolution± 0.001% of full scale or 6 arc minutes
    Accuracy± 0.02% of full scale maximum (0.01% typical)
    Temperature Drift± 0.01% per °C
    Operating Temperature0 ° to 55 °C
    Humidity10% - 90% non condensing
    Weight24 ounces
    Voltage117 ± 10%
    Frequency47 - 63 Hz
    Load8 Watts, maximum
    DISPLAY
    Type5-digit LED
    Digit Height0.56 inch (14.2 mm)
    Viewing distance23 feet
    Decimal pointField programmable (scaled modes only)
    OPTIONAL ANALOG OUTPUT
    Outputs± 1 mA
    0-1 mA
    0-2 mA
    4-20 mA (requires 15 to 24 VDC external loop power)
    Compliance10 Volts (0-1 mA, ± 1mA, 0-2 mA)
    500 Ohms (4-20 mA)
    Non-Linearity± 0.1% of full scale
    Resolution12 bits (± 0.025% of full scale)
    OPTIONAL HI/LO RELAYS
    Contact Rating3A @ 125/250 VAC (resistive), 30 VDC
    • Panel cut out: 1.653" (42 mm) x 3.543" (90 mm)
    • Panel thickness: 0.1" (2.7 mm) to 0.19" (5.0 mm)