3. Equipment operating modes monitorin

Equipment operating modes monitoring shall be provided:

• Synchronized measurement of current, voltage, power, temperature, pressure and other operating parameters of equipment in normal, pre-fault and emergency modes.

• Control output modes of the equipment over fixed limits with the issuance of the alarm.

4. Automated substation equipment control

Remote automated control from the following levels should be provided:

From upper (substation) level by means of operating personnel WS or WS of upper control level:

• By remote control of SU of 110\330kV of principal electrical scheme (circuit-breakers, disconnectors, earthing blades and etc.) taking into account logical interlocks.

• Automated control of equipment using algorithms of operative switching blank forms (in the framework of process regulations and regulatory documents).

• By circuit-breakers 10\35kV

• By input and sectional automates of Auxiliary and DC boards.

From connection level:

• From built-in mimic bay controller, or a group of bays, or mimic bay, which is controlled by bay controller

From lower level (process level):

• From SU control cabinet.

Note: in order to improve the control system’s reliability, the following SU control hierarchy shall be provided:

In normal operating mode of the ACS TP:

• Circuit-breakers, disconnectors and earthing blades with electric operating mechanism 110/330kV shall be controlled by control elements, which are part of the bay controller (from mnemonic diagram on the sensor panel of the bay controller or bay mnemonic diagram, controlled by bay controller) ensuring all technological locks. Control commands are recorded in the event log of the bay controller.

• Circuit-breakers 10/35 kV, OLTC, input and sectional circuit-breakers 0,4 kV, fire extinguishing pumps and gate valves shall be controlled by buttons (key) in the cubicles of RP & SA, OLTC, AuxBoard, DC board at the SS. Control commands are recorded in the event log of the bay controller.

When bay controllers (of connection level) are out of order:

• Circuit-breakers, disconnectors, eathing blades 110/330 kV, fire extinguishing pumps and gate valves shall be controlled at the SU locations (SU control cabinets are installed in the area where it is safe to operate and maintain them).

For equipment control (local, remote), software or hardware interlocking shall be provided, to prevent simultaneous control from different workstations, and process interlocking logic shall be implemented (against open-phase mode, against “jumping”, against asynchronous closing, against control operations desequencing and so on.).

All actions of operating personnel regarding equipment control from WS or on spot shall be recorded in the ACS TP archives, indicating time, character and control method.

The ACS TP shall also record operations on SU control mode (“local” – “remote”), with identification of control level.

Control commands shall be transmitted from the ACS TP to the operation mechanisms SU via solid wire copper control cable.

It is allowed to transmit control commands from the ACS TP controllers to the operating mechanism via MP-based relay protection devices using discrete outputs of these devices.