20. Complete set of defense autotransformers 330 kV on differential, controlled from distance and current principle (basic and dublicate)

The complete set of defense can consist of one or a few microprocessor devices and must realize next functions:

• differential defense (three/two) of puttee AT;

• controlled from distance defense with four independent areas and rebuilding from loading;

• protecting from a thermal overload;

• differential current defense of a zero sequence;

• maximal current defense (on complete currents and currents of a zero sequence);

• current pinch-off (on complete currents and currents of a zero sequence);

• automatic control tension of transformer;

• control of the second chains of tension;

• control of the second current chains;

• amount groups of setpoints – not less than 4th;

• synchronization of time-signals;

• free-programmable logic;

• internal recorder of events;

• oscillographic testing;

• energyindependent memory;

• measurings: currents, tensions, frequency, power;

• self-diagnostic of device;

• liquid-crystal screen on a front panel;

• user-programmable light-emitting-diode indicators for signaling;

• signaling about the state and functioning of device;

• support of protocol of MEK 61850, and presence of standard international protocols of exchange by information for integration in ACS;

• front port of Ethernet (Rs232) for connection with a device;

• back port with an optical fibre ethernet-interface for connection with ACS substations;

21. Complete set of defense transformers 110 kV on differential, controlled from distance and current principle

The complete set of defense can consist of one or a few microprocessor devices and must realize next functions:

• differential defense of transformer;

• controlled from distance defense with independent areas and rebuilding from loading;

• protecting from a thermal overload;

• differential current defense of a zero sequence;

• maximal current defense (on complete currents and currents of a zero sequence);

• current pinch-off (on complete currents and currents of a zero sequence);

• automatic control tension of transformer;

• control of the second chains of tension;

• control of the second current chains;

• amount groups of setpoints – not less than 4th;

• synchronization of time-signals;;

• free-programmable logic;

• internal recorder of events;

• oscillographic testing;

• energyindependent memory;

• measurings: currents, tensions, frequency, power;

• self-diagnostic of device;

• liquid-crystal screen on a front panel;

• user-programmable light-emitting-diode indicators for signaling;

• signaling about the state and functioning of device;

• support of protocol of MEK 61850, and presence of standard international protocols of exchange by information for integration in ACS;

• front port of Ethernet (Rs232) for connection with a device;

• back port with an optical fibre ethernet-interface for connection with ACS substations;

22. Complete set of differential defense of tires 330 kV and 110 kV

Functional requirements:

• differential current protection with braking;

• three-phase created with two-zone differential protection;

• choice of the protection zone based on the position of the auxiliary contacts high-voltage apparatus;

• sensitive organ differential protection;

• control algorithm protection zones;

• two options to monitor the situation isolator / switch;

• fixing algorithm incorporating the measured current connection to the zone A (B);

• merger of the two areas into one in the "fixing broken" connection or, if necessary, (regardless of the position of disconnectors);

• selective disconnection of the differential busbar protection switches related area;

• functional testing circuits TT incoming connections;

• Blocking protection with fault circuits;

• Reserve non-directional overcurrent protection;

• Three-phase and phase-segregated breaker failure start, the control current position of the auxiliary contacts switch or adaptive combination of the two signs;

• free-programmable logic;

• amount groups of setpoints – not less than 4th;

• signaling about the state and functioning of device;

• self-diagnostic of device;

• internal recorder of events;

• oscillographic testing;

• energyindependent memory;

• liquid-crystal screen on a front panel;

• displayed on the screen information about the status of switching devices connection;

• user-programmable light-emitting-diode indicators for signaling;

• support of protocol of MEK 61850, and presence of standard international protocols of exchange by information for integration in ACS;

• front port of Ethernet (Rs232) for connection with a device;

• back port with an optical fibre ethernet-interface for connection with ACS substations;