Abstract
The objective of this work is to determine the influence of high-frequency link (HFL) on functioning of phase comparison protection (PCP) through the usage of detailed models that take into account specific features of the PCP and processes in HFL. The article describes the case of the most common variant of the high frequency signal transmission by using a scheme ‘phase-to-ground’. To verify suggested solution the developed mathematical model of HFL has been studied. Presented simulation results confirm the effectiveness of the proposed approach for solving the problem.
Highlights
One of the main reasons for wrong actions of the phase comparison protection (PCP) is inappropriate setting for the particular implementation and operating conditions
This means that, in accordance with the existing methods for calculating relay protection (RP) settings, accounting the actual conditions of the functioning of the particular implementation of protection is carried out very simplistically - through a variety of generalized adjusting coefficients. The latter is due to the fact that the software systems used to determine the RP settings in which the calculation is made in strict accordance with existing procedures, as well as systems for modelling regimes and processes in electric power systems (EPS) is used several limitations and assumptions. This is connected with a numerical method for solving differential equations [2, 3], and reproducible primary regime information and its transformation by particular implementations of PCP contains errors
The value of reserve on the blocking angle is recommended to choose a minimum of 30° using the same half-sets of PCP
Summary
One of the main reasons for wrong actions of the phase comparison protection (PCP) is inappropriate setting for the particular implementation and operating conditions. It is related to over-generalized view of the errors generated by measuring transformers and by apparatus of the used protection, as well as the use of insufficiently reliable primary regime information [1] This means that, in accordance with the existing methods for calculating relay protection (RP) settings, accounting the actual conditions of the functioning of the particular implementation of protection is carried out very simplistically - through a variety of generalized adjusting coefficients. The latter is due to the fact that the software systems used to determine the RP settings in which the calculation is made in strict accordance with existing procedures, as well as systems for modelling regimes and processes in electric power systems (EPS) is used several limitations and assumptions. This is connected with a numerical method for solving differential equations [2, 3], and reproducible primary regime information and its transformation by particular implementations of PCP contains errors.
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