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Multilin™ Intelligent Line Monitoring System
 

Multilin™ Intelligent Line Monitoring System

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  • Grounding Treatments/Synchronization Overview: Utilities use various types of Grounding treatments, and these can be generally classified as high impedance and low impedance. In some cases, Utilities use a mixture of grounding treatments in separate parts of their networks. The GE System captures faults in both of these grounding treatments, and fundamental to meeting this challenge is accurate timing synchronization. The timing synchronization works in two distinct ways, that is applicable to both types of grounding treatments. Local Synchronization: Unlike underground cables, MV overhead networks have little opportunity to use core balanced CTs to capture ground faults. When Sensors are mounted on separate phases, each sensor that forms a set of three must be time synchronized to each other to achieve their correct phase relationship. This technique, when it is part of an overall network Synchronization, makes a much more valuable source of data, for example in determining sequence currents and correcting imbalance. Network Synchronization: In high impedance grounding treatments it is necessary to get a feeder reference Voltage to compare the phase of the distributed fault currents at each node. This extracts the real part of the fault current, and delivers directional fault information at each node. In order for this to work, the Voltage reference monitoring device needs to be in accurate time synchronization with the Overhead Line Current Sensors. An SNG (the same device that is used with the line Sensors), is installed in the feeder substation, and has a dedicated ODV input to capture this Voltage reference.
  • The T-NET Software, 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 the most accurate method of safely increasing circuit capacity. Static or Seasonal rating has been the standard in circuit capacity ratings for many years, but static rating techniques are not efficient, as they do not take into account the prevailing conditions that impact on real time rating. Capturing the correct capacity of circuits is critical in two distinct ways. Underestimating capacity means that assets are being underutilized, and are not delivering full value for their cost. Overestimating capacity creates unsafe conditions due to ground clearance issues. Static rating does not deal with either of these issues. Capacity calculation based on real time influences such as weather and conductor temperature, is generally described as Dynamic Line Rating, and will increase circuit capacity, while at the same time safeguard against clearance problems. The T-NET Software has been designed to optimize circuit capacity and clearance safety on circuits up to 140kV. It achieves this by utilizing all of the influencing ambient data, such as wind speed and direction, as well as the fundamental factor, which is the temperature of the conductor.
  • The T-NET Software uses the combination approach of distributed weather data, load and conductor temperature and is the most cost effective and comprehensive way to deliver dynamic line rating. It enables the rating algorithms to become dynamic in their own right, as the conductor temperature measurement provides a calibration input to the algorithm to correct the thermal changes to the static values of the conductor over time, and uses the weather data to facilitate short term forecasting of rating. The conductor temperature input also delivers further value, as it delivers a line sag application. The combination of weather with distributed conductor load/temperature data is what the T-NET Software uses, and it delivers a low cost solution that optimizes capacity, and delivers a ground to conductor clearance safeguard.
  • The T-NET Software, 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 the most accurate method of safely increasing circuit capacity. Static or Seasonal rating has been the standard in circuit capacity ratings for many years, but static rating techniques are not efficient, as they do not take into account the prevailing conditions that impact on real time rating. Capturing the correct capacity of circuits is critical in two distinct ways. Underestimating capacity means that assets are being underutilized, and are not delivering full value for their cost. Overestimating capacity creates unsafe conditions due to ground clearance issues. Static rating does not deal with either of these issues. Capacity calculation based on real time influences such as weather and conductor temperature, is generally described as Dynamic Line Rating, and will increase circuit capacity, while at the same time safeguard against clearance problems. The T-NET Software has been designed to optimize circuit capacity and clearance safety on circuits up to 140kV. It achieves this by utilizing all of the influencing ambient data, such as wind speed and direction, as well as the fundamental factor, which is the temperature of the conductor.
  • The T-NET Software, 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 the most accurate method of safely increasing circuit capacity. Static or Seasonal rating has been the standard in circuit capacity ratings for many years, but static rating techniques are not efficient, as they do not take into account the prevailing conditions that impact on real time rating. Capturing the correct capacity of circuits is critical in two distinct ways. Underestimating capacity means that assets are being underutilized, and are not delivering full value for their cost. Overestimating capacity creates unsafe conditions due to ground clearance issues. Static rating does not deal with either of these issues. Capacity calculation based on real time influences such as weather and conductor temperature, is generally described as Dynamic Line Rating, and will increase circuit capacity, while at the same time safeguard against clearance problems. The T-NET Software has been designed to optimize circuit capacity and clearance safety on circuits up to 140kV. It achieves this by utilizing all of the influencing ambient data, such as wind speed and direction, as well as the fundamental factor, which is the temperature of the conductor.

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