Brochure · EN — 11-page Siemens Energy presentation-format brochure (prepared for the CIGRE Paris Session 2024) introducing Fixed Series Capacitors (FSC) as the answer to increasing transmission system capacity and stability on existing lines. It explains why grids need more transmission capacity (growth in energy consumption, remote generation, environmental concerns about new lines), how series capacitor insertion virtually shortens a line and increases power transfer without harming stability, and names the four FSC components: capacitors, metal oxide varistor, bypass breaker and damping circuit — 'the simplest and most cost-effective type of series compensation'. One anonymized U.S. reference project is described (2x FSC, 500 kV, 631 MVAr / 897 MVAr, completed 2020). The document contains no electrical ratings table — the only quantitative figures are those of the reference project, reproduced here.
This 11-page Siemens Energy document (presentation format, 2024) is titled "Fixed Series Capacitor — Boost your Transmission System" and was prepared for the CIGRE Paris Session 2024 (every page carries the footer "CIGRE Paris Session 2024 — Unrestricted © Siemens Energy, 2024"). It opens with the question "How to increase transmission system capacity and stability on existing lines?" and positions Siemens Energy as "your solution partner for Fixed Series Capacitors" (pp. 1-2, 5).
Fidelity note: the document contains no electrical ratings table and no product-variant data — it is a concept-and-components introduction. The only quantitative figures printed anywhere are those of the single reference project on page 9, reproduced verbatim in the reference section below. No specifications have been added from any other source.
Increasing energy demand can only be supported by grids with sufficient transmission capacity. The brochure lists the modern trends driving this: growth in energy consumption; generation located in remote parts of the grid; environmental concerns related to new transmission lines; reduced footprint for transmission systems; and lower costs and time needed to adapt to changes in the grid. The resulting challenges are an increase in power transfer capability and longer AC transmission paths (p. 3).
Transmission capacity and system stability are key factors for energy transmission. Power transmission is limited by the line's impedance, which grows with its length; the active power that can be transmitted is limited by ohmic resistance, capacitive and inductive reactance. The brochure's answer: insertion of reactive power elements into transmission lines results in higher transmission capacities and increased grid stability (p. 4).
Insertion of reactive power elements results in higher transmission capacities. Series capacitor insertion: leads to a virtually shortened line; enables the power transfer to be increased without harming the system's stability; and increases stability by reducing transmission angle. The page pairs these three bullets with an efficiency/cost icon ("Efficiency €").
The FSC consists of four numbered components, shown both on a rendered platform view of an installed series capacitor bank (p. 7) and on a single-line diagram (p. 8): 1 Capacitors, 2 Metal Oxide Varistor, 3 Bypass Breaker, 4 Damping Circuit. In the single-line diagram the damping circuit (4) and bypass breaker (3) form one parallel path, the metal oxide varistor (2) a second, and the capacitor bank (1) the third, with a further bypass switch path outside the dashed platform boundary.
Both pages carry the same banner conclusion, verbatim: "FSC: The simplest and most cost-effective type of series compensation".
| No. | Component |
|---|---|
| 1 | Capacitors |
| 2 | Metal Oxide Varistor |
| 3 | Bypass Breaker |
| 4 | Damping Circuit |
The brochure closes its technical story with one reference project at a U.S. utility (customer name and project site names withheld here per catalog guardrail; they are printed in the source document). Challenge: limited power transmission and increasing line impedance. Scope: 2x FSC, 500 kV, rated 631 MVAr and 897 MVAr respectively. Solution and benefit: replacement of an existing FSC constructed in 2003; limited outage for demolition, construction and commissioning; increase of the transmission capacity; and mitigation of an angular stability issue. Location: USA; completion: 2020.
Published by Siemens Energy, Technical Sales & Marketing FACTS, Siemenspromenade 11, 91058 Erlangen; e-mail factsinfo.energy@siemens-energy.com; siemens-energy.com. The disclaimer page (p. 11) notes that the information contains general descriptions and/or performance features which may not always specifically reflect those described and that requested performance features are binding only when expressly agreed in the concluded contract.
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