About Hugh

This is about Hugh

About Hugh

27/11/2019 By Hugh Leave a Comment

Comparison between XGSLab and CDEGS

In his previous blog, Ian explained our decision to work with XGSLab, on the basis that it is an equally capable tool as CDEGS, that is much easier to use. In this blog, I’m going under to hood, so to speak. Comparing CDEGS with XGSLab to show you some real-world examples where CDEGS and XGSLab give almost identical results.

Therefore, in all of these examples, we have completed and verified the earthing design for these sites and found good agreement between the modelled results and the post-installation measurements. On this basis, we can say that XGSLab matches CDEGS for accuracy, and both tools have good agreement with the real-world measurements.

[Read more…]

11/04/2019 By Hugh Leave a Comment

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. Therefore, on your earthing arrangements.

Many industrial sites 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. Thus the design to obsolete standards? Therefore to know what hazard this presents today, is simply unknown.

[Read more…]

28/02/2019 By Hugh Leave a Comment

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

I recently attended a training session with Omicron in Germany. So, looking at their primary injection test set for earth electrode and line impedance systems testing. I looked at how to set up a current injection. Potentially up to 100 A. Also, 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 High Voltage systems. Thus, avoiding road closures. etc. Therefore, comes as a breath of fresh air to a lot of engineers facing this problem.

[Read more…]

03/09/2017 By Hugh Leave a Comment

Your 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…]

25/05/2017 By Hugh Leave a Comment

Electrical Earthing Testing in Urban Environments

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

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

So, any lead deployment invariably obstructed by something, e.g. roads, cars, walls, buildings, etc. And, assuming the leads can be accommodated. An electrical earth test is likely to suffer in-ground noise and interference from the city’s / town’s infrastructure. Also, not to mention the curious passers-by. Whom would like nothing more than to see you struggle for a laugh by stealing your test leads. When you turn your back.

[Read more…]

About Hugh

About Hugh

Footer

Contact GreyMatters