The Multilin Intelligent Line Monitoring System is an end-to-end overhead line monitoring solution with advanced analytics that provides actionable intelligence to distribution utilities to improve the reliability and efficiency of their networks.
Fault location and maintenance planning (Multilin X-NET)
Dynamic line rating calculation and analysis software (Multilin T-NET)
Sensor Network Gateway (SNG)
Collects data from the line sensors and weather stations
Provides backhaul communications to analytical applications
Measures critical parameters of the overhead lines
Time synchronized sampling enabling wide area analysis of network events and characteristics
- Cost effective, modular network monitoring solution
- Reduced downtime, opened constraints and enhanced network visibility
- Accurate time synchronized system delivers aligned information distributed throughout the network
- Overhead line sensor designed for fast installation on live networks dramatically reduces overall cost of ownership
- Scalable system suitable for piloting or network wide deployment
- Remote firmware upgrade enables compliance with new and more challenging regulatory and operational requirements
The advanced analytics delivered by the Multilin Intelligent Line Monitoring System's X-NET software provides an end-to-end solution for fault location and field crew deployment.
Fault Detection & Analysis System
- Detects faults on both high and low impedance grounding treatments
- Uses wide area time synchronization to deliver time aligned fault data
- Quickly determines fault location and notifies operators and repair crews via visual, email and SMS
- Directs crews to where maintenance is needed
- Guide maintenance work required by the type of faults occurring
- Repetitive transients indicative of:
- Need of tree trimming
- Salt build-up
- Aging equipment
Wide Area Synchronization
- All sensors can trigger network wide fault uploads
- X-NET software will analyze fault reports from sensors
- Wide area analysis is performed for delivering the location of fault
GE's Multilin T-NET software provides advanced analytics that utilizes the data delivered from deployed sensors and weather stations to increase circuit rating. The hybrid approach of using conductor temperature, load and distributed weather data delivers an accurate and safer method of increasing circuit capacity. The Multilin T-NET software provides a calculation of dynamic line rating at each node installed.
Dynamic Line Ratings System
- Determines current carrying capability of overhead networks
- Utilizes real-time data measured from multiple locations of the line
- Line loading
- Conductor temperature
- Ambient temperature
- Wind direction and speed
Display Real-Time Rating of Line
- Location on the line with capacity bottleneck
- Current line loading
- Maximum safe capacity at bottleneck location
- Additional current capacity that the line can support
Line Sag Calculations
- Calculates line sag at each measured location
- Weather conditions
- Terrain effects
- Clearance of line to ground
The Multilin FMC-T6 line sensor can be installed on a live line using either hot-stick or hot-glove and takes just minutes to complete. The sensor commences operation as soon as it is closed around the conductor. It measures the electrical current, both amplitude and phase at a sampling rate of 1.6 kHz, and delivers its data via an on-board 2.4 GHz radio. The sensor can be supplied with an optional temperature probe on a flying lead. This probe measures the surface temperature of the conductor.
The sensor weighs 6kgs and will sit on conductors between 10mm and 28mm in diameter. The magnetic field of the line provides the power for the sensor, and also charges a 48 hour battery back-up that keeps the sensor fully operational in the event of an outage. All sensors are fully synchronized to the timing pulse of the GPS, and have an 80 minute on-board buffer memory that logs data and downloads events when polled.
If the option of a temperature probe is being used GE recommends that a thermal compound is used between the conductor and the probe top (please refer to the sensor installation instruction manual). Sensors can be installed on voltages up to and including 140kV, and indicate locally that they are functioning via a small flashing LED mounted in the sensor housing.
SNG is the gateway communications device that links the line sensors and weather station (if used) with the system console. It communicates back and forward to the line sensors by radio and to the weather station by a wired serial link. The SNG delivers all the data to the system console at a central server over GPRS for processing and storage. The SNG synchronizes the sensors to the PPS timing pulse via its GPS transceiver.
The SNG is built into an easily installed, pole mounted enclosure. Radio range between the line sensors and the SNG is typically 30 meters, and the SNG is normally mounted on the same pole or structure underneath the sensors. It is a low power device and can be powered by a solar panel (suitable for latitudes not greater than 55 degrees N/S), or alternatively by a 100V/250V AC power supply. An SNG usually has 3 sensors reporting to it (one sensor per phase). At certain locations, for example at a branch port, a single SNG can accommodate 6 sensors, effectively monitoring two circuits simultaneously.
There are two options for powering the SNG: solar via a 30W panel (suitable for latitudes not greater than 55 degrees N/S) or a 100V/250V AC supply. When the SNG is installed, a data-enabled GPRS SIM card is inserted into the SNG's modem and it commences communication to the system console at the server.