Practical Electrical Network Automation and Communication by Cobus Strauss CPEng
By Cobus Strauss CPEng
Some time past automation of the facility community was once a really really expert zone yet lately as a result of deregulation and privatization the world has develop into of an outstanding significance simply because businesses require additional information and communique to reduce expenditures, lessen group and reduce mistakes with the intention to make a profit.
* Covers engineering specifications and company implications of this state-of-the-art and ever-evolving box
* offers a different perception right into a fast-emerging and growing to be marketplace that has turn into and may proceed to conform into one in all prime communique applied sciences
* Written in a pragmatic demeanour to aid readers deal with the transformation from the outdated analog setting to the fashionable electronic communications-based one
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Extra resources for Practical Electrical Network Automation and Communication Systems (IDC Technology)
It is important to note that the communication link between the master and slave relay needs to be a direct one-on-one link, that is, not through a network or a SCADA system, as speed of communication (in ms) and absolute integrity of the link are vital to the reliable operation of differential protection and can not be compromised. 1 summarizes and compares the qualities of the different types of direct communication links. 5, along with other forms of busbar protection. Fundamentals of electrical protection 37 Properties 1.
The general philosophy of applying protection in a power network is to divide the network into protective zones, such that the power system can be adequately protected with the minimum part of the network being disconnected during fault conditions. 5). When protective zones overlap, the main protection for one zone usually functions as the backup protection for the lower zone. 2 Discrimination Discrimination, or selectivity, is the ability of the protection to isolate only the faulted part of the system, minimizing the impact of the fault on the power network.
A more specialized type of earth fault protection commonly used, is ‘restricted earth fault’ protection, where the current flowing from earth into the star-point of a neutral earthed transformer is monitored. Ideally this current should be zero under normal system conditions, with a current flowing only under earth fault conditions. This is a more accurate form of earth fault protection, but can by nature only be applied in the transformer zone of protection. Another form of earth fault is often used in especially transmission applications, termed ‘sensitive earth fault’ or ‘sustained earth fault’ protection.