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首页> 外文期刊>IEEE Transactions on Power Delivery >Novel medium voltage fault current limiter based on polymer PTCresistors
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Novel medium voltage fault current limiter based on polymer PTCresistors

机译：基于聚合物PTC电阻的新型中压故障限流器

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摘要

For limitation and interruption of short circuit currents innmedium voltage (MV) applications, fuses and circuit breakers are widelynused today. Fuses exhibit excellent current limitation, but work onlynfor a single shot. Circuit breakers are multi-operation devices, butnallow several periods of the short circuit current to pass. Based on newnPTC materials (positive temperature coefficient of resistance), wenpropose a new current limiting device for MV applications, which offersnthe chance to combine the advantages of fuses with the advantages ofncircuit breakers: a fast current limitation with a repetitive operation.nThe active material consists of conducting particles in a polymericnmatrix. Its challenging property is a change on resistivity by eight tonten orders of magnitude upon temperature increase. This allows thenlimitation of available short circuit currents in a stable insulatingnstate for a long period of time. The device consists of a seriesnconnection of PTC resistors with varistor elements connected innparallel, which serve for a perfect voltage distribution. Using thisnprinciple, repetitive current limitation of prospective currents of 4 ton14 kA within about 1 ms could be demonstrated at circuit voltages up ton12 kV
机译：为了限制和中断中等电压（MV）应用中的短路电流，今天广泛使用了保险丝和断路器。保险丝具有出色的电流限制，但只能单发工作。断路器是多操作设备，但是不允许短路电流经过几个周期。基于新型nPTC材料（电阻正温度系数），提出了一种适用于中压应用的新型限流装置，它提供了将保险丝的优点与断路器的优点相结合的机会：快速限流和重复操作。聚合物基质中的导电颗粒的数量。它具有挑战性的特性是，随着温度的升高，电阻率会发生八吨数量级的变化。然后，这允许长时间在稳定的绝缘状态下限制可用的短路电流。该设备由PTC电阻的串联连接和并联连接的压敏电阻元件组成，可实现理想的电压分配。使用该原理，可以在电路电压高达ton12 kV的情况下，在约1 ms内证明4 ton14 kA的预期电流的重复电流限制。

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