We perform a range of ground testing for small and medium electrode systems. To ensure a proper connection from your systems neutral to global earth potential, grounding systems must be used and maintained.
If a single-phase fault occurs, it will cause a potential rise of the grounding system towards the global earth potential. This is due to the current flowing back to the neutral via the grounding system, where the ohmic is low. It is important to do ground system tests as the effects could be lethal to humans and animals.
Testing standards EN50522, IEEE81, and IEEE 80/81 define maximum values for potential rise depending on the single-phase fault duration of a system. The standards also set out clear guidelines about the step and touch voltages in and around the substation. If these standards are not followed, the substation can be dangerous to animals and humans in the area.
Our ground testing services can help you to ensure that you are meeting all the necessary standards and provides an efficient method for determining grounding system impedance as well as step and touch voltages surrounding your substation.
Certain areas around the substation, like the fence, for example, there is a big danger from step and touch voltages. That is why it’s absolutely essential that you use ground testing to measure the step and touch voltage in different locations to ensure that the area is safe.
The step and touch voltages will be measured by injecting a current with a frequency variable current source and by then grounding the remote end of the line. We will ensure that all step and touch voltages are safe and meet the guidelines.
Ground impedance tests are an important part of grounding system testing. A single-phase fault will be simulated by passing a test current through one of your power lines, using a frequency variable currency source, and grounding the remote end of the line. The voltage between the grounding system and a spike inserted into the soil outside the substation will then be tested. This whole process will be repeated until the voltage is no longer increasing. This value will be calculated up to the ground potential rise under real fault conditions.
During ground impedance tests, interference suppression is especially important. In many grounding system testing methods, this is achieved by a high-power injection at the mains filter and the application of a filter to suppress interference. However, we can offer a solution that allows you to inject much smaller currents, which provides you with far more accurate results.
Without an effective ground testing process in place, you cannot be sure that your substation is safe. We have experience working with a wide range of different industries and carrying out grounding system testing. We will always ensure that your substation meets the correct standards and it is safe. If you need ground testing services, get in touch today to find out how we can help you.