Our project portfolio varies throughout the various industry sectors and with our experience throughout these sectors we’re here to provide you with the most cost effective Engineering Power Solution.
We have been involved with a wide range of projects ranging from renewable energy technology to traditional fossil fuel extraction, chemical process and manufacturing projects. Many of these projects involved detailed design of either new large electrical equipment and others have been something as simple as area lighting for a new substation. Whatever the size of the engineering project you can almost guarantee that there’ll be some form of electrical engineering involvement.
At present we’re helping to connect the next generation of efficient wind turbine technology to the existing electrical power distribution network. We’re also providing solutions and answers to electrical engineering issues to extract oil & gas from the most onerous environmental conditions. So, whether its power system modelling for a larger water injection pump, plant electrical protection settings or a new hydro power plant electrical system design Engineering Power Solutions can help you.
A wind farm in Scotland was granted planning permission including a connection in principal was offered, however SSE were concerned of the number of wind turbine transformers that could potentially be energised simultaneously. Energisation of unloaded transformers results in a magnetising inrush current with a high amplitude.
The inrush currents can have many unfavorable effects, including operation failure of transformer differential protection, deterioration of the insulation and mechanical support structure of windings and reduced power quality of the system. Without controlled switching the energisation may occur at any time on the voltage wave producing high current peak, when the transformer core is driven into saturation.
The wind turbines power transformers, a vital components of the 11kV electric power network, required the protective relays with very high dependability, security, and speed of operation. But the magnetising peak current, which is often generated when the transformer is energised, may have caused false tripping of the differential relay protection, therefore a reduction of peak current would be necessary. Some methods have been to reduce high peak currents. Pre-insertion of series resistors and synchronous closing of circuit breakers are examples of the available mitigation techniques.
However, Engineering Power Solutions concluded that the most convenient and cost effective solution in this case was to control transformer energisation through operational procedures by means of controlled step sequencing methods, switching on transformers individually through a PLC based system.
A number of wind turbines were granted planning permission near Edinburgh, Enercon required these wind turbines to be connected to the local 11kV distribution network. The nearest electrical 11kV connection point however was located 2.8 km and the land in between both the wind turbine and 11kV connection point was not owned by the client, this meant that it proved difficult to obtain wayleaves to install a new 11kV cable across the privately owned land. An alternative solution was to install a new 11kV cable at the side of an existing public road with a total route length of 4.8 km.
Using the electrical power software DigSILENT Engineering Power Solutions conducted a load flow and short circuit study to assess the impact of what the new wind turbines would have on the voltage and assess the magnitude of the additional short circuit current at the 11kV point of connection. SP Energy Networks accepted the load flow and short circuit study report and granted connection to the 11kV distribution network.
Engineering Power Solutions proceeded with the design and was requested to produce a detailed design for an 11kV switch station and an 11kV substation at both ends of the new 11kV cable. To enable the electrical contractors to quote for the work the EPS electrical design workpack included:
The wind turbines were successfully installed and connected to the 11kV distribution system to produce a maximum of 2.4 MW electrical power (an average of 21,024,000 kWhrs per annum). This is the equivalent of supplying 840 homes.
Bluewater owns and operates a fleet of five Floating Production Storage and Offloading (FPSO) installations around the globe currently leased to oil & gas companies. EPS was requested to undertake a comprehensive electrical protection offshore survey of their Haewene Brim FPSO, the survey consisted of a 4 day period gathering details of electrical protection settings for the entire distribution network. EPS produced a total of 75 off schedules which were issued detailing the MV and LV electrical protection distribution system.
The up to date protection schedules were then used to create a comprehensive power system model with each protection device. This model was used to create a range of time current curves for a large number of individual circuits with a protection study report.
EPS provided recommendations based of on the findings from the protection report that would enhance the protection and increase the reliability of the electrical distribution system.
We’re currently undertaking an Arc Flash Assessment report complete with an Arc Flash risk assessment with recommendations of how to mitigate potential high energy arc flash using existing protection devices and how to protect their work force.
Peter Rawson - Operations Director