4 achievement(s) found

Sizing an earth network

As part of a gas compression plant installation project, the customer needed to validate and justify the sizing of the earth network in a way that complied with the standard in force for the step and touch voltages. [...]

Sizing the distribution grid for a new town

As part of a new town pilot study (eco-city concept), it was necessary to carry out a basic pilot project for the electricity distribution grid. [...]

Transformer Energisation study

When a transformer is energised, two main phenomena occur: an inrush current and a voltage drop at the primary side. The amplitudes of these two phenomena depend greatly on the remanent (or residual) magnetic flux, the transformer saturation curve and the instant of energisation. Before being commissioned, it should be checked whether the transformer is compliant or not with the local electrical grid standards.

Before the commissioning of a 40MVA power transformer on the UK electrical grid (33kV), the customer wanted to check if the transformer complies with the national standards in terms of voltage drops (« P28: Planning limits for voltage fluctuations caused by Industrial, Commercial and Domestic equipment in the United Kingdom ») during its energisation process.

If the voltage drop exceeds the limits, the transformer will not be compliant and therefore unfit to be commissioned. Mitigation devices should be installed in order to reduce the voltage. [...]

Analysis of the earth network for an electric substation

For the extension of the EDF Saint Raphael source substation, EDF wished to validate the sizing of the earthing system of the substation. [...]