PRINCIPLES OF IMPLEMENTATION OF CURRENT PROTECTION FROM INTERPHASE SHORT-CIRCUITS ON THE POWER LINES WITH UNILATERAL FEED

The paper proposes and describes the functional diagram of the overcurrent protection in detail, provides realization of the implementation of the principles set out in the article. Paper content includes the description of the elements of the considered overcurrent protection, such as input current transducers connected to the measuring current transformers of the protected line, maxiselector, miniselector, block of the determination of the mode type, the measuring unit with the setting unit, detecting fault location unit with the setting unit, calculation unit and control unit with time delay parameter setting, an OR gate, the actuating element, that opens circuit breaker of the protected line. The operation of the proposed scheme is reviewed in  the  article.  All  units  and  elements  of functional  circuit overcurrent protection  can  be implemented with the help of analog and digital technology. Modern microprocessors can be used for these purposes.

The efficiency of provided implementation of the principles of overcurrent protection from phase-to-phase short circuits on the power lines with unilateral feed was studied by computational experiments. These results confirm the effectiveness of the proposed solutions and also trip of short-circuit within the main zone line protection is provided without delay, and in the end zone redundancy – with time delay that is not exceeding 2Δt in all  areas, including the head portion of the network.

1. Romaniuk, F. A., Tishechkin, A. A., Rumiantsev, V. Iu., Novash, V. I., Bobko, N. N., Glinskii, E. V. (2008). About Choice of Pick-up Characteristics of the Current Relay Protections in the Distribution Networks with Unilateral Feed. Izvestiia Vysshikh Uchebnykh Zavedenii i Energeticheskikh Ob’edinenii - Energetika [Proceedings of Higher Education Institutions and Power Engineering Associations – Power Engineering], 6, 5–10 (in Russian).

2. Kovalevskij, A. V. (2007). Choice of the Numerical Values Criteria for the Determination of the Type of Short Circuit in Adaptive Microprocessor Current Relay Protections. Izvestiia Vysshikh Uchebnykh Zavedenii i Energeticheskikh Ob’edinenii - Energetika [Proceedings of Higher Education Institutions and Power Engineering Associations – Power Engineering], 6, 5–13 (in Russian).

3. Romaniuk, F. A., Tishechkin, A. A., Bulojchik, E. V. (2011). Determination of the Type of Fault on the Lines of Distribution Networks in the Range of Functions of Microprocessor Current Relay Protections. Izvestiia Vysshikh Uchebnykh Zavedenii i Energeticheskikh Ob’edinenii - Energetika [Proceedings of Higher Education Institutions and Power Engineering Associations – Power Engineering], 4, 5–10 (in Russian).

4. Fedoseev, A. M. (1984). Relay Protection of Electric Energy Systems. Relay Protection of Electric Power Networks. Moscow, Energoatomizdat. 520 p. (in Russian).

5. Chernobrovov, N. V., Semenov, V. A. (1998). Relay Protection of Electric Energy Systems. Moscow, Energoatomizdat. 798 p. (in Russian).

6. Shabad, M. A. (2003). The Calculations of the Parameters of Relay Protection and Automation in the Distribution Networks. 4th ed. St.Petersburg, PEIPK. 350 p. (in Russian).

7. Shneerson, E. M. (2007). Digital Relay Protection. Moscow, Energoatomizdat. 549 p. (in Russian).

8. Romaniuk, F. A., Shevaldin, M. A. (2014). Detection of Fault Location on the Power Lines 6–35 kV with Unilateral Feed. Izvestiia Vysshikh Uchebnykh Zavedenii i Energeticheskikh Ob’edinenii - Energetika [Proceedings of Higher Education Institutions and Power Engineering Associations – Power Engineering], 5, 5–14 (in Russian).

9. Romaniuk, F. A., Tishechkin, A. A., Gurjanchik, O. A. (2010) Detection of Short-circuit Point Location on the Lines of Distribution Networks in the Range of Functions of Microprocessor Current Relay Protections. Izvestiia Vysshikh Uchebnykh Zavedenii i Energeticheskikh Ob’edinenii - Energetika [Proceedings of Higher Education Institutions and Power Engineering Associations – Power Engineering], 6, 5–13 (in Russian).

10. Romaniuk, F. A. (2001). Information support of the Microprocessor Relay Protections of the Electrical Installations. Minsk, Tehnoprint. 133 p. (in Russian).