System comprising at least two loads which are connected to common feed line and can be switched off selectively, and use of at least one interrupter switching element with externally activatable ignition device for safely separating load from electric grid feeding load
A technology for switching elements and ignition equipment, which is used in the application of safely disconnecting consumers from the feeder network, and in the field of intermittent switching elements, which can solve the problem of inability to safely achieve simultaneous fuse tripping, high engineering costs, and inability to achieve selective active tripping etc.
Active Publication Date: 2022-01-21
西门子能源全球有限两合公司 +1
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- Application Information
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Problems solved by technology
Semiconductor fuses are relatively expensive and not available in the medium voltage range
The fuse cannot be commanded to close, making selective active tripping based on current measurements and / or voltage measurements impossible
Also, in the case of fuses, simultaneous tripping of multiple fuses in the microsecond range cannot be safely achieved
[0004] Semiconductor fuses must be selected according to rated current, overload current and short circuit current, which results in high variance
Sensitive and selective placement requires high engineering effort
Cannot ensure safe layout if configuration can be changed after design
Method used
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[0032] figure 1 The illustration in FIG. 1 shows an example of a system 10 with at least two consumers 14 each connected via a parallel tap to a common feeder 12 . The feeder 12 is, for example, a DC feeder. A DC feeder with multiple parallel taps is also commonly referred to as a DC bus. In the following, the feeder 12 will be referred to simply as the DC bus 12 without giving up broad generality. For example, a converter (inverter, inverter) or a combination of a converter and a drive or other load connected to the converter is considered as consumer 14 . An intermediate circuit capacitor 16 is connected upstream of such a consumer 14 in a manner known per se.
[0033] Each consumer 14 comprised by system 10 is connected to DC bus 12 by means of its own parallel branch 20 . Each consumer 14 comprised by the system 10 is associated in a parallel branch 20 leading towards the respective consumer 14 with at least one intermittent switching element 22 with an externally acti...
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The invention relates to a system (10) comprising at least two loads (14) which are connected to a common feed line (12) and can be switched off selectively and to the use of at least one interrupter switching element (22) with an externally activatable ignition device for safely separating a load (14) from an electric grid feeding the load.
Description
technical field [0001] The invention relates generally to the protection of electrical consumers, in particular in direct voltage networks, and in particular to a system with at least two consumers connected to a common feeder and which can be switched off selectively, and with externally activatable At least one intermittent switching element of the ignition system is used for safe disconnection of consumers from the supply network. Background technique [0002] When using converters with a modular design, the task of protecting converters operating in parallel arises. According to the converter topology, the converter can be a two-point converter, a multi-point converter or an MMC converter (Modular Multi Level Converter, modular multi-level converter). [0003] Today, semiconductor fuses are used for protection in low voltage levels. For medium voltage applications, DC semiconductor fuses are not available. Semiconductor fuses are relatively expensive and not available...
Claims
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IPC IPC(8): H02H3/087H01H39/00H02H7/18
CPCH02H3/087H02H7/18H02J3/14H01H39/006Y04S20/222Y02B70/3225H02H1/0007H02H3/10
Inventor 维科·舒尔茨沃尔夫冈·福斯
Owner 西门子能源全球有限两合公司