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首页> 外文会议>Power and energy systems : Innovative smart grid technologies for sustainable power and energy systems >DESIGN, FABRICATION AND TESTING OF TRANSFORMER STATIC DIFFERENTIAL RELAY CIRCUIT WITH HARMONIC BLOCKING
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DESIGN, FABRICATION AND TESTING OF TRANSFORMER STATIC DIFFERENTIAL RELAY CIRCUIT WITH HARMONIC BLOCKING

机译：谐波阻塞变压器静态微分继电器电路的设计，制造和测试

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摘要

An integrated approach that provides a compact, reliable, cost effective solution to the problem of false tripping of differential relays during inrush is presented. The circuitry for detection of inrush current and second harmonic is implemented using low cost integrated devices. The implementation is for an inrush activated blocking scheme based on an instantaneous level of differential current and its rate of change. The relay allows for second harmonic ratio detection using active band pass filters and to avoid tripping during inrush condition. A prototype which prevents false tripping of the differential relay during inrush and second harmonic detection is designed and tested at Karnataka Power Transmission Corporation Limited, Bangalore, Karnataka, India. The behavior of inrush current with and without load and second harmonic detection circuits to avoid false tripping is designed and experimented. The corresponding waveforms under test conditions were captured and analyzed. The measurements of primary and secondary currents of transformer using the prototype are tabulated. The present system can be extended to a three phase system with minor modifications. The system is applicable in detection of inrush current, detection of second harmonic and differential current calculation.
机译：提出了一种集成的方法，该方法可提供一种紧凑，可靠，具有成本效益的解决方案，以解决浪涌期间差分继电器误跳闸的问题。用于检测浪涌电流和二次谐波的电路是使用低成本集成器件实现的。该实现是针对基于瞬时差分电流及其变化率的浪涌激活的阻塞方案。该继电器允许使用有源带通滤波器检测二次谐波比率，并避免在浪涌条件下跳闸。在印度卡纳塔克邦班加罗尔的卡纳塔克电力传输有限公司，设计并测试了一种原型，该原型可防止在突入和二次谐波检测期间差分继电器误跳闸。设计并试验了带和不带负载的浪涌电流的行为以及避免误跳闸的二次谐波检测电路。捕获并分析测试条件下的相应波形。将使用原型对变压器的一次和二次电流的测量结果列表化。本系统可以以较小的修改扩展到三相系统。该系统适用于浪涌电流的检测，二次谐波的检测以及差动电流的计算。

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