PROTECTION SYSTEM FOR DC POWER TRANSMISSION SYSTEM, AC-DC CONVERTER, AND METHOD OF INTERRUPTING DC POWER TRANSMISSION SYSTEM
First Claim
1. A protection system for a DC power transmission system,the protection system being for use in a configuration including an AC-DC converter between an AC system and the DC power transmission system, whereina DC circuit breaker is provided between the DC power transmission system and the AC-DC converter,a bypass switch capable of short-circuiting a converter cell included in the AC-DC converter is connected to an inside of the AC-DC converter or an outside of the AC-DC converter on an AC side, and,when a fault occurs in the DC power transmission system, the bypass switch is turned on to interrupt supply of DC power from the AC system to the DC power transmission system.
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Accused Products
Abstract
A traction motor comprises a stator, a rotor core, an iron core holder, a cooling fan, a rotor, a frame, a bracket, and a bearing unit. The cooling fan includes a main plate that separates the inside and the outside of the totally-enclosed traction motor; blades provided on the bracket side of the cooling fan and along a rotational direction of the rotor; and a guide provided on the bracket side of the blades. In the bracket, inlets are provided within an area obtained when the guide is projected onto the bracket. The guide is formed such that air drawn in through the inlets is guided to a rotor shaft.
38 Citations
17 Claims
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1. A protection system for a DC power transmission system,
the protection system being for use in a configuration including an AC-DC converter between an AC system and the DC power transmission system, wherein a DC circuit breaker is provided between the DC power transmission system and the AC-DC converter, a bypass switch capable of short-circuiting a converter cell included in the AC-DC converter is connected to an inside of the AC-DC converter or an outside of the AC-DC converter on an AC side, and, when a fault occurs in the DC power transmission system, the bypass switch is turned on to interrupt supply of DC power from the AC system to the DC power transmission system.
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13. (canceled)
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14. An AC-DC converter provided between an AC system and a DC power transmission system, the AC-DC converter converting AC power from the AC system to DC power to supply the DC power via a DC circuit breaker to the DC power transmission system, wherein
a bypass switch capable of short-circuiting a converter cell included in the AC-DC converter is connected to an inside of the AC-to-DC converter or an outside of the AC-to-DC converter on an AC side, and the AC-DC converter further comprises a current limiter inside the AC-DC converter for each phase.
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15. An AC-DC converter provided between an AC system and a DC power transmission system, the AC-DC converter converting AC power from the AC system to DC power to supply the DC power via a DC circuit breaker to the DC power transmission system, wherein
a bypass switch capable of short-circuiting a converter cell included in the AC-DC converter is connected to an inside of the AC-to-DC converter or an outside of the AC-to-DC converter on an AC side, and the bypass switch is provided for each of the converter cells.
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16. An AC-DC converter provided between an AC system and a DC power transmission system, the AC-DC converter converting AC power from the AC system to DC power to supply the DC power via a DC circuit breaker to the DC power transmission system, wherein
a bypass switch capable of short-circuiting a converter cell included in the AC-DC converter is connected to an inside of the AC-to-DC converter or an outside of the AC-to-DC converter on an AC side, and the bypass switch is provided for a cell group including two or more of the converter cells connected in series.
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17. A method of interrupting a DC power transmission system, the method being for use in a configuration including an AC-DC converter between an AC system and a DC power transmission system, an AC circuit breaker between the AC system and the AC-DC converter, a DC circuit breaker between the DC power transmission system and the AC-DC converter, and a bypass switch connected to an inside of the AC-DC converter or an outside of the AC-DC converter on an AC side, the bypass switch being capable of short-circuiting a converter cell included in the AC-DC converter, the method comprising:
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a step of turning on the bypass switch when a fault occurs in the DC power transmission system; a step of performing an interruption by the AC circuit breaker after the bypass switch is turned on; and a step of performing an interruption by the DC circuit breaker after the interruption by the AC circuit breaker.
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Specification