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How to Protect Overhead Lines?

Views: 188     Author: Site Editor     Publish Time: 2021-05-25      Origin: Site

What is a temporary failure and how to minimize it

For residential users, a brief malfunction may be just an annoyance, requiring reprogramming of the clock on the microwave oven and video recording equipment. For factory merchants, even if the interruption only lasts for a short time, instantaneous operation is still a huge economic consumption.


More than ten years ago, researchers at the Lawrence Berkley National Laboratory (Berkley Lab) published a groundbreaking paper, but they are still citing the paper titled "Understanding the Costs of Power Interruptions for U.S. Electric Consumers." At that time, researchers discovered that the power outage caused approximately $57 billion in business interruptions and other losses to commercial customers. Industrial customers have suffered a hit of $20 billion. Residential customers lost only $2 billion. A total of 79 billion US dollars was lost, which is Berkley Lab's lowest estimate.

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What are transient faults and how to deal with them?

Industry data estimates that 75% to 80% of failures on overhead distribution lines are temporary failures-short power interruptions are called transient failure interruptions. These faults are caused by events such as strong winds, bird strikes, and tree contact. They are difficult to find and usually take eight hours or more tedious utility workers to manually check the overhead electric lines.


The fault current indicator (FCI) can tell utility companies when it happens, but they cannot pinpoint the location or instant, which may indicate a fault that may eventually lead to longer downtime in the future. Nor will they discover voltage issues that may indicate impending failure and damage to equipment.


Public utilities are currently scrambling to understand what is happening in their overhead power distribution. This is why smart grid sensors that provide more accurate data and analysis to understand the data are becoming the preferred solution for utilities that require greater visibility into the grid. Last year, according to the prediction of relevant departments, the compound annual growth rate of the smart grid sensor market from 2017 to 2025 will reach 30.3%.



Choose a smart grid sensor

Therefore, when seeking to protect overhead power lines, which reliable cable fault indicator sensors and automated cable fault indicator monitoring system should utility managers look for? The platform should have the following characteristics:


1. Comprehensive monitoring function

Take advantage of sensor deployment by ensuring that the device captures the power quality metrics required for system visibility. These include voltage, current, power and power factor, phase angle, dips, surges, harmonics, and instantaneous or other disturbances.


2. Flexible communication

Look for remote fault indicator sensors that can quickly report time-sensitive events. Also useful: the ability to carry existing utility networks. In addition, ensure that sensor data can be pushed to Historian, DMS or SCADA systems through the DNP3 interface.

overhead lines


3. Easy to deploy

The line fault indicator can save costs, and the sensor can be clip-mounted using a hot rod or insulating gloves. Eliminate the cost of battery replacement by using inductively powered sensors.


4. The correct associated software

Smart grid sensors are only as good as the software of the digital cable fault indicator used to check the data they provide. Make sure that your sensor is used in conjunction with or with predictive analysis software, which can warn system operators of ongoing fault conditions(such as short circuit and overloading). The analysis should also support more effective management of switching operations and long-term network planning.

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