FIELD: electricity.
SUBSTANCE: at preliminary stage, a complete line model is created in a three-phase form, taking into account the mutual inductive and capacitive couplings between the line wires and the ground. In the event of a short circuit, the values of the complex phase voltages on the buses and the phase currents in the line before and at the moment of short circuit are measured and recorded. The registration of several periods of pre-fault current and voltage regimes is performed in digital process registers of emergency processes. Then the line model is divided into equal parts, for example from the support to the support, pre-war stresses are formed at the end of each section in each phase, starting from the tires from one end of the line. Pre-emergency currents are formed at the end of each sector in each phase, starting from the tire with both ends of the line, register modules phase voltages at the end of each sector in each phase, starting from the tire with both ends of the line. Graphs are plotted, according to the pre-emergency voltage modules, with axes on both sides of the dependency of the voltage modules on the part number (on the distance). Check the ratio of deviation from each other derived distribution curves of voltage modules from one end of the line and from the other end of the line, update, correction factor forms new values and their own mutual longitudinal resistance phase of plots line. The values of the phase voltages measured on the buses and currents from the two ends of the line are obtained. The stresses are formed at a short-circuit at the end of each section in each phase, starting from the buses from one and the other ends of the line, form currents at a short-circuit at the end of each section in each phase, starting from the buses from one end of the line, the phase voltage modules are recorded at the end of each section in each phase, starting from the tires from one end of the line. Graphs are plotted, according to the voltage modules at short-circuit, with axes on both sides of the dependency of the voltage modules on the part number (on the distance). The intersection points of the graphs at one and the other end of the line corresponds to the short-circuit location.
EFFECT: increasing the efficiency of electricity supply, increasing the accuracy of the location of damage detection.
4 dwg
