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Published byHector Connard Modified over 2 years ago

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PTD T PN E R&D Dr. Plötner, :46 Seite 1 Some technical characteristic of current-limiting reactors Airtype - reactor linear magnetic behaviour (L - constant) spreading magnetic field around reactor (weak EMC behaviour) damping of reactor noise is difficult space consuming earth-quake withstand capability expensive Oiltype – reactor nonlinear magnetic behaviour for high currents (L – decreasing at high currents) almost no electromagnetical radiation outside tank antinoise damping can easily be provided by enclosure or by tank wall damping cooling equipment (radiator bank) free placeable

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PTD T PN E R&D Dr. Plötner, :46 Seite 2 limb as gapped core limb without iron core Fe-mass> Cu-mass< total mass> three limbfive limb height> Z0 / Z1 ~ 0.8< 1 core induction: - low for short-circuit limiting - normal for power flow controlling (post-failure application) Design of oil-type current-limiting reactors

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PTD T PN E R&D Dr. Plötner, :46 Seite 3 Initial issues to be discussed application comparison between oil-type and dry-type - noise request - EMC - space available - impedance (L-I-curve, symmetry between phases) - earth-quake conditions range of magnetic linearity -> impedance at normal and at short-circuit cond. zero-sequence impedance available current level for heat-run test …

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PTD T PN E R&D Dr. Plötner, :46 Seite 4 Inductance over current for ConEdison New York

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PTD T PN E R&D Dr. Plötner, :46 Seite 5 Inductance over current for „Elstree DR2“ (400 MVA)

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PTD T PN E R&D Dr. Plötner, :46 Seite 6 Example: 3~ series reactor for NGCT „Elstree DR2“ application: post-failure load-flow control cooling: ODAF throuput power: 2000 MVAR reactor power: 400 MVAR nominal current: 2887 A, system voltage: 400 kV induction: 1, A current density: 3,6 A/mm^2

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PTD T PN E R&D Dr. Plötner, :46 Seite 7 Example: 3~ series reactor for ConEdison in New York application: short-circuit current limitation and load-flow control cooling: ONAN throuput power: 358 MVAR reactor power: 64 MVAR nominal current: 1500 A / 2800A / 7500 A, system voltage: 138 kV induction: 0, A current density: 2,3 (4,3) A/mm^2

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PTD T PN E R&D Dr. Plötner, :46 Seite 8 Test capability of the Nuremberg plant for heat-run test reactive power for compensation (C-battery): 2 x 97 MVAr generator power 1~: 16 MVA generator power 3~: 26 MVA whole power for compensation 1~: 210 MVAr whole power for compensation 3~: 220 MVAr max. AC-current C-battery: 2500A max. AC-current generator: 300A max. AC-current: 2800A max. DC-current: 4000A (voltage 1.5kV)

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