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Turn to turn faults usually cause smaller changes in the phase currents of a shunt reactor when fewer turns are involved. Designing a sensitive and reliable algorithm for turn to turn fault detection in shunt reactors still remains a challenge. In this paper, a novel hybrid differential algorithm has been proposed to detect turn to turn faults in shunt reactors. The proposed algorithm calculates the...
The common form of bus differential protection is to use either a high impedance differential relay or a biased low impedance differential relay. Bus protection using a feeder overcurrent blocking scheme is also widely used in the sub-transmission and distribution levels due to the high cost of the complete bus differential protection solution. IEEE Working Group C-14 of the Power System Relaying...
Turn to turn faults usually cause smaller changes in the phase currents of a shunt reactor when fewer turns are involved. Designing a sensitive and reliable algorithm for turn to turn fault detection in shunt reactors still remains a challenge. In this paper, a novel hybrid differential algorithm has been proposed to detect turn to turn faults in shunt reactors. The proposed algorithm calculates the...
Power system disturbances may cause stable or unstable power swings in the system. As a result, apparent impedance trajectories could enter into distance characteristics during a power swing and cause distance relay mis-operation. A power swing blocking (PSB) function is typically included in modern distance relays to block distance elements from undesired operation due to a power swing.
In spite of the existence of more accurate fault location methods, such as multi-ended and travelling wave fault locators, the majority of digital relays in the field still use single-ended fault locator method. User expectations for the fault locator accuracy are very high, as it affects how fast faulted line component can be identified and repaired.
Fault Locators in general are designed for HV solidly grounded systems because of the importance of fault location detection in the overhead transmission lines. In distribution line fault location there are some developments that are based again on the impedance measurement from one end. Accurate fault location in distribution systems is more difficult to achieve because of the existence of multiple...
In recent years, renewable energy generators have been widely promoted in Ontario to offset their polluting counterparts. Due to connection cost of these generations, most of the renewable generation stations are connected to Hydro One transmission system at nearby HV transmission lines. However, the direct connections of the generation on the transmission line result in increase of apparent impedance...
Ground distance protection philosophies will affect how ground distance is applied to protect transmission lines. This paper will explore some of the common philosophies and demonstrate under which conditions each philosophy should be used. Some of the philosophies to be explored are resistive ground fault coverage, the use of Quadrilateral verses Mho characteristics, supervision and polarization...
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