Independent electrical engineering, from study to energisation — for industry, renewable developers and infrastructure operators, in France and worldwide.
HV substation — site work & studies on high voltage networks
HV / MV / LV studies and calculations, owner's engineering, audits and protection testing — supporting your projects from design through to operation.
Full network modelling in ETAP and PowerFactory with standardised deliverables.
Technical assistance across the project lifecycle and technical audits of your electrical assets.
Testing and commissioning of protection chains, through to energisation.
Tailored training for your operation and maintenance teams.
On-site measurement campaigns and equipment diagnostics, delivered in partnership with Volt Expertise.
In-house simulation and measurement resources, for reliable results and autonomous site work.
We own primary and secondary injection test sets for protection relay testing, settings and pre-energisation checks.
Measurement and diagnostic campaigns — power quality, insulation, thermography, soil resistivity — draw on the shared resources of the Volt Expertise partnership.
Trusted by demanding clients, from major industrial groups to infrastructure funds.
Full harmonic study — network modelling, distortion analysis across several operating scenarios, resonance risk assessment and transformer derating.
LV / HV / DC arc flash and earthing study — incident energy calculations, PPE definition per work location, earthing grid sizing.
Technical support for the design review of a high-voltage GIS substation serving datacenter & AI infrastructure — document review, project compliance, review of design and execution studies, site follow-up.
Complete design of the protection chain for a very high power site — protection philosophy and functions, CT sizing, settings calculation, then commissioning follow-up through to energisation.
Complete substation engineering — sizing of transformers, switchgear, cables, protections and earthing — tender documents, contractor selection support and project follow-up through to delivery.
Protection scheme — 13.8 kV MV single-line diagram
Selectivity study — time-current curves (ETAP)
Earthing system — potential profile & step voltages
LDHT Engineering works in tandem with Volt Expertise. Where LDHT delivers numerical modelling, calculations and upstream engineering studies, Volt Expertise brings the on-site physical measurement, diagnostics and high-precision verification that validate them.
From numerical simulation to field measurement, this partnership gives you complete control of electrical risk — from design through to operation.
LDHT Engineering is an independent power system studies and advisory practice, founded by Léo Delaunay, with over 15 years of experience spanning field work, engineering studies and profit-centre management.
A career built within major inspection and engineering groups, from regulatory inspection to the supervision of HV / MV / LV studies on major projects.
Tell us about your project, its location and expected schedule — we will get back to you for a first discussion with no commitment.
Contact us