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Electrical Earthing System Design & Soil Resistivity Testing

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How do I know my 1950’s earthing arrangements are still keeping my workforce safe?

I thought I’d continue from my last blog piece talking about heavy current injection earth testing by talking about a key application where it can potentially deliver much better results than the modern CDEGS approach on your earthing arrangements.

Many industrial sites were built in the 1950s and 60s as industrialisation grew. This, in line with the expansion of the electrical grid, led to a huge program of electrical substation construction around the world. What this means is that some of us own the responsibility of managing sites with ageing transformers, assets and equipment which were designed to obsolete standards and knowing what hazard this presents today, is simply not known.

[Read more…] about How do I know my 1950’s earthing arrangements are still keeping my workforce safe?

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Test large electrode systems using heavy current – for more accurate earth electrode resistance measurements

I recently attended a training session with Omicron in Germany, looking at their primary injection test set for earth electrode and line impedance testing. We looked at how to set up a current injection, potentially up to 100 A, down an Overhead line or Feeder cable to achieve good separation between the electrode under test and the auxiliary electrode.

Previously, test methods have relied on dedicated cables for the measurement, which has limited the available area to deploy the auxiliary electrode, owing to land usage constraints and roads. So, being able to use something in a built-up environment on electrically large HV systems avoiding road closures, etc. comes as a breath of fresh air to a lot of engineers facing this problem.

[Read more…] about Test large electrode systems using heavy current – for more accurate earth electrode resistance measurements

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Standard earthing design – are they valid anymore?

A number of organisations across the UK recommend a standard earthing design when building smaller scale substations. The key driver behind these is one of cost. Nobody wants to pay more than they have to. For an HV connection using a templated approach to meet Earthing Standards compliance kind of makes sense – or does it?

So, the question is – does installing a standard earthing design meet your obligations under the Electricity at Work regulations?

[Read more…] about Standard earthing design – are they valid anymore?

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Electrical Earthing Testing in Urban Environments

Electrical earthing testing.  We are asked frequently – How do you test an Earth in London?

Here’s the scenario.  You’re faced with Electrical earthing testing a substation that is located right in the middle of a heavily built-up area. With hard surfaces everywhere together with congested buried infrastructure in every direction.

Any lead deployment is invariably obstructed by something, e.g. roads, cars, walls, buildings, etc.  And, assuming the leads can be accommodated. A test is likely to suffer in-ground noise and/or interference from the city’s / town’s infrastructure.  Not to mention the curious passers-by: who would like nothing more than to see you struggle for a laugh by stealing your test leads when you’re back is turned. [Read more…] about Electrical Earthing Testing in Urban Environments

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Why an Independent Consultant Designer for Your Earthing and Lightning Protection

At GreyMatters, we’re often asked, “Why You, an Independent Consultant? [earthing designer] Why not someone else who is cheaper?”

Top 1%

We’ve said a lot in the past about our technical capabilities, regarding using top 1% software, top 1% test equipment, and investing in best of breed top 1% training to provide you’ve guessed it a packed of top 1% Earthing Design services. [Read more…] about Why an Independent Consultant Designer for Your Earthing and Lightning Protection

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