Hitachi Energy Switzerland Ag

Hitachi Energy Ltd

Preetham Venkat Yalla

Obbalareddi Demudu Naidu

Neethu George

Od Naidu

Vedanta Pradhan

Suresh Maturu

Sachin Srivastava

Nandkishor Kubal

Dinesh Patil

Fault location determination in a power transmission system is described. Samples of voltage and current measured are obtained for each phase at a terminal. A first equivalent reactance value based on the samples of voltage and current is calculated. Further, based on the calculated equivalent reactance value a first fault location is determined.

Fault location determination in a power transmission system

The present specification provides a method and device for determining a disturbance condition in a power transmission line. The method may include obtaining a plurality of sample values corresponding to an electrical parameter measured in each phase. The method may further include determining a plurality of magnitudes of the electrical parameter corresponding to each phase based on the corresponding plurality of sample values and determining a plurality of difference values for each phase based on the corresponding plurality of magnitudes. The method may include processing the plurality of difference values using a machine learning technique to determine the disturbance condition. The disturbance condition may be one of a load change condition, a power swing condition, or an electrical fault condition. The method may also include performing at least one of a protection function or a control function based on the disturbance condition.

Machine learning based method and device for disturbance classification in a power transmission line

Examples of fault location in a power transmission line connecting a first and a second terminal is described. In an example, arrival times of a first peak, a second peak, and a third peak of a travelling wave detected from measurements carried out at the first and second terminals is detected. A rise time associated with the first peak of the travelling wave is calculated. One of a first half and a second half of the power transmission line is identified, as having a fault, based on a comparison of the rise time. One of a first segment, a second segment, a third segment, and a fourth segment of the power transmission line is identified as having the fault. Length of the power transmission line is estimated. The fault location is estimated based on identification of one of the first, second, third, and fourth segments as having the fault.

Parameter independent traveling wave-based fault location using unsynchronized measurements

Examples of operating an Intelligent Electronic Device (IED) during power swings, are described. In an example, voltage measurements for a phase is received and sampled. Root mean square (RMS) values of the voltage samples is calculated based on the voltage measurements. Delta quantities for each phase are calculated based on the RMS values. Each of the RMS values and delta quantities are associated with respective sampling instants. In response to a delta quantity being greater than a predefined threshold, a peak delta quantity is detected. A time interval between a sampling instant associated with the peak delta quantity and a sampling instant associated with a first delta quantity is determined. Based on a comparison of the time interval with a threshold time, a disturbance condition may be detected as a power swing and consequently, fault detection at the IED may be blocked.

Intelligent electronic device operation during power swing

The invention relates to protection from faults in a power transmission system having two or more transmission lines. Travelling waves are detected from a signal obtained with a measurement equipment associated with a bus of the power transmission system. Arrival times of a first peak of a first travelling wave, a second travelling wave and a third travelling wave, are detected from the signal. A value for line length is calculated from the arrival times and propagation velocity of the travelling wave in the corresponding transmission line. The calculated value is compared with an actual length of the corresponding transmission line, for determining if the fault is an internal fault or an external fault. According to the fault being one of the internal fault and the external fault, a signal for controlling a switching device associated with the corresponding transmission line is generated.

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Bengaluru, India

Preetham Venkat Yalla