METHOD OF LOCATING A FAULT IN A POWER TRANSMISSION SCHEME

• Main Authors: SRI GOPALA KRISHNA MURTHI, Sankara Subramanian, HA, Hengxu
• Format: Patent
• Language: English; French; German
• Published: 22.11.2023
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

There is provided a method of locating a fault in a power transmission scheme. The power transmission scheme includes a plurality of power transmission sections and a plurality of connection points (J0-J5), the plurality of connection points includes a first end connection point (J0), a second end connection point (J5) and at least one intermediate connection point (J2-J4), and each of the plurality of power transmission sections is arranged to interconnect a respective two of the plurality of connection points such that the plurality of power transmission sections are connected successively between the first and second end connection points and such that the or each intermediate connection point interconnects a or a respective neighbouring pair of the power transmission sections. The method comprises the steps of: (i) measuring first and second end voltage phasors at the first and second end connection points respectively; (ii) obtaining a first set of voltage phasors, wherein the first set of voltage phasors includes the measured first end voltage phasor and further includes respective voltage phasors at each of the second and intermediate connection points that are determined based on the measured first end voltage phasor; (iii) obtaining a second set of voltage phasors, wherein the second set of voltage phasors includes the measured second end voltage phasor and further includes respective voltage phasors at each of the first and intermediate connection points that are determined based on the measured second end voltage phasor; (iv) comparing the first and second sets of voltage phasors to identify the power transmission section or connection point corresponding to the location of the fault, wherein each voltage phasor of the first set of voltage phasors is compared to the respective voltage phasor of the second set of voltage phasors that corresponds to the same connection point.