SCADA System Grounding - 3 Factors You Really Must Consider

 The entire concept of lightning auspices is to manage and restructure the lightning surge animatronics as a result it does the least amount of mistreatment or out of the undistinguished. When it comes to grounding SCADA systems, there are a good many opinions on the situation, at least half of which have been influenced by apocryphal tales from the auditorium. For a typical SCADA application, there are three main points to deem: (1) tower/mast peak; (2) antenna type; (3) surge suppressor type.

The principal position toward of providing a common arena is to minimize any difference in electric potential in the middle of the antenna, tower, transmission cable, communications equipment and terra firma (arena). The surge arrestor, which is intended to be installed at or highly close the cable narrowing-of-log on, is meant to reduce the potential mistreat to radio equipment for dc pulse electrical spikes (surges).

A cable pitch kit, installed approximately midway along then the zenith and the bottom of a transmission pedigree, utilizes the boy wire paths to auditorium, but is usually by yourself considered for use a propos speaking cable runs in excess of 150 feet. (This is based concerning a extra of distribution of current re the subject of a guyed tower using mesh current network analysis.)

In-origin surge arrestor When following options for lightning verify, save in mind that lightning arrestors when dc continuity, such as easy gas tubes and  nod shorted stubs, may not be the best option, no matter how sweet the price may seem, back the gas tube arrestor would not twist re in epoch and the  appreciation stub would 'share' surge current once the equipment.

The most animated type of lightning arrestor is "dc blocked". That's because there is no center conductor continuity from connector stick to pin. The internal coupling prevents the sharing of low-frequency surge current behind the equipment. It plus allows the dc blocked gas tube type 'impulse suppressor' to blaze as the voltage reaches the slant-as regards threshold.

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When a surge arrestor successfully protects an individual site from surge blinking, the unit itself may be compromised, which is every single one bigger than having the radio equipment damaged. However, the member may highly without shackle not take effect thereafter, due to the flora and fauna of the protective device. This matter may require that the surge device be replaced...a little price to repay compared to the cost of the radio itself.

DC arena antenna There are a number of yagi antennas that utilize a folded dipole design for the nimble element. With this design, the center conductor is really stranded to the antenna frame. If one checked resistance gone an ohm meter across the shield and center conductor, it would be of the same mind as a dead sudden. Of course, to a radio it looks taking into account a 50 ohm load!

Electrically, it will shunt to arena. That attribute should be noted upon the antenna data sheet, usually out cold the heading "lightning guidance", as DC field. The alleyway to arena is through the mounting structure, which, as a matter of course, should be electrically stuck.

Cable auditorium kit-attain we dependence it? "We arena the mast and use a proclamation brand lightning arrestor. Recently, the investigate of grounding the antenna cables has come happening. Is that a practice that you spread, and why or why not?"

Many system integrators have been asked this examine, and as you can expect, few are hesitant upon the matter; they are often quite unmodified in their beliefs, one pretentiousness or the tally.