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10 achievement(s) found As part of the construction of the Severstal industrial site in Russia, Capsim carried out a study of the protection plan of all the HV and LV electrical grids. [...]As part of the connection of a 63/20 kV transformer station supplying a gas compression plant, CAPSIM investigated the risk of ferroresonance on the site. [...]Because of changes in power consumption and the need for redundant power supply to FPSO (Floating Production Storage and Offloading Unit), it is strongly of interest to electrically interconnect units present in the same area using undersea cables. However, the impact on electrical plant in terms of dynamic stability, short circuit currents and harmonics must be analyzed in detail. [...]The industrial site studied was constructed in the 1950s and has been subject to many changes. The electricity distribution grid on the site contains several autonomous sources (turbine generators), distributed at various points on the HVA and HVB grids. The function of these generators is to supply the priority units in the event of a power grid problem (internal or external to the site).
The site was recently subject to two major incidents in less than six months on the main HVA distribution grid, incidents which resulted in the loss of supply to the priority units and the start-up of the autonomous sources supplying power to these units. Following these incidents, the operator undertook a campaign to modernize the excitation regulation for the turbine generators.
This involved allowing the customer to understand the dynamic behaviour of its autonomous sources in the event of a transient event on the grid. The initial objective was to analyze and validate the causes of the incident. The second objective was to analyze the influence of modifications made to the excitation regulation and to detect the operating limits to impose on the autonomous sources after modification. [...]The site studied was a very large facility undergoing reconversion that would result in it accommodating new consumption units and new generators (biomass plant) using the existing electrical grid. In this configuration, the operator, via a suitable structure, must ensure the supply of utilities (steam, electricity, etc.) for all of the industrial units present on the site. The realization of this service relies directly on the concepts of availability and reliability of the grids and the generators.
In this context, the project involved producing: - An audit of the electrical grid consisting of identification of the strong and weak points of the HVA distribution network, in order to make the HVA grid reliable,
- A complete review of the protection plan in light of the results from the dynamic study and the replacement of analogue protection relays by a new generation digital relays.
[...]Prior to the stability study described here, CAPSIM had produced power flow calculations and calculations of the short-circuit currents for the operator of an industrial electrical power grid. These calculations had been used to validate the sizing of equipment and to put in place a protection plan for the grid.
The turbine generators for that network could operate either independently or coupled to the public distribution grid and simulations were carried out for the two operating configurations. Events acting on the islanded configuration could more easily result in a grid instability because the short-circuit power of the sources was lower.
The objective of the study was to validate the protection plan put in place by CAPSIM as well as to perform a study of the dynamic behaviour of the turbine generators when subject to disruption events. The outdated nature of the generators and their excitation raised questions regarding their robustness and their effectiveness when faced with such events.
[...]On an existing oil installation consisting of several platforms, the production of electricity and the power supply for water injection pumps on the platforms was being directly realized by ageing turbine generators. The obsolescence of this equipment led the operator to develop an electricity power grid using a shore-based electricity plant and an underwater connecting cable (between 20 and 30 km long at a depth of 30 m) linking the plant to the various platforms.
As part of this renovation project, it was necessary to evaluate the impact of normal transient events (load connection, load shedding, connection of the generator to the grid) and incidental events (short-circuit, loss of the generator, etc.) on the electrical power supply to the platforms. [...]The customer wished to understand the causes of a fault observed on the output of a 15 kV capacitor bank which had caused its removal from service. It also wanted CAPSIM to carry out a reactive compensation study to avoid additional invoicing from its energy supplier. [...]The distribution grid of the Arsenal de Toulon is one of the largest private grids in France with more than 150 transformer stations.
Because of the obsolescence of certain protection devices and the limitations of the current protection plan, the management sought assistance to successfully complete the work with a view to updating the protection plan for the 10 kV - 50 Hz high voltage grid supplying its site. Moreover, it wished to improve the reactive energy compensation of the network in order to reduce its energy bill. [...]This study involved sizing 156 current transformers (CT) which will be installed on the HVA grid of an industrial site in the Middle East.
Sizing the current transformers is a critical step in the correct operation of the protection plan for an industrial grid. An unsuitable current transform may result in a protection device malfunctioning.
The project also involved sizing the single-pole tori used for protection at maximum earth current. [...] | 
