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US 2002/0176265 A1Published application
Electrical substation
AssigneeAlstom
InventorDonald Colin Murray Oates
Life of this patent
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AssigneeAlstom
InventorDonald Colin Murray Oates
Estimating the term…
A substation (100) is disclosed for use in a power transmission and distribution network. The substation comprises a single phase isolating high frequency transformer (101) having at least one input winding (112, 113) and at least one output winding (114-117) with corresponding input (104) and output (105) solid state switching networks. Each input solid state switching network (104) comprises a plurality of semiconductor switching devices which receive an input waveform from the transmission network and output a high frequency waveform to the primary winding of the transformer. Likewise, each output solid state switching network (105a-105d) comprises a plurality of semiconductor switching devices receiving a high frequency waveform from the secondary winding (114-117) of the transformer and outputting an output frequency waveform from the substation. A control means (110) is adapted to control the operation of the switching device of the input and output switching networks (104, 105) to generate the output waveform from the input waveform.
A substation for use in a power transmission and distribution network, characterised by:
A substation according to any preceding claim in which the input switching network comprises a bridge circuit having at least one input node for each phase of the input supply.
A substation according to any preceding claim in which the control means is adapted to:
A substation according to any preceding claim in which the control means in adapted to control the semiconductor switching devices so as to produce at least one output voltage waveform which is independent of the input voltage waveform.
A substation according to any preceding claim in which the semiconductor switching devices are arranged in relation to the transformer so that in the event of a failure of one or more semiconductor switching devices or of the transformer or of the control means then power is not transmitted across the transformer.
A substation according to any preceding claim in which the control means is adapted to control the semiconductor switching devices, at least of the input switching network, in such a way as to match the input impedance of the substation to the source impedance of the supply line.
A substation according to any preceding claim in which a limiting means is provided which is adapted to reduce the maximum output voltage produced in the event that the current drain exceeds a preset level.
The network of claim 14, 15 or 16 in which a circuit breaker and an isolator are provided upstream of the substation and an isolator is provided downstream of the substation.
Dependencies are inferred from the claim text.