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Receive-transmit complex of control information of automatic load-frequency control system of Boguchanskaya HPP

Boguchanskaya HPP is a hydroelectric power station on the Angara River, near Kodinsk in the Kezhemsky District of Krasnoyarsk Territory. This HPP is included in the Angara’s HPP cascade and it is its fourth, lower level.

The HPP has a design capacity of 2997 MW and is one of Russia's largest HPPs.

The power generation scheme of Boguchanskaya HPP includes the following facilities:

  • 220 kV Priangarskaya electrical substation (in commission);
  • two high voltage 220 kV lines of Boguchanskaya HPP – Priangarskaya – Razdolinsk with reconstruction and extension of 220 kV Razdolinsk electrical substation (in commission);
  • two high voltage 220 kV lines of Boguchanskaya HPP – Kodinsk HPP with reconstruction of 220 kV “Kodinskaya” electrical substation, with a possibility of extension by the existing double circuit 220 kV high voltage line to Sedanovo electrical substation of Irkutsk power system (in commission since June 2011);
  • 500 kV Angara electrical substation 2004 MVA capacity (commissioning in 2012-2014);
  • two high voltage 500 kV lines of Boguchanskaya – Angara HPP (in commission since 2013);
  • 500 kV high voltage line of Angara – Ozernaya HPP (in commission since 2013);
  • 500 kV high voltage line of Angara – Kamala HPP (in commission since 2012);
  • 500 kV high voltage line of Boguchanskaya – Ozernaya HPP (in commission since 2013).
Purpose

The receive-transmit complex of control information of the automatic load-frequency control system (RTCCI of ALFCS) is designed to collect and transmit the information necessary for management and operation of the automatic control systems of the power system modes and the emergency automation systems.

The RTCCI of ALFCS functions are:

  • receiving the telecontrol information from the server of the ALFCS (capacity of Boguchanskaya HPP, 500 kV power line frequency, the flows of active and reactive power at the exhaust of 500 kV high voltage lines, the state of 500 kV high voltage line);
  • reception of telesignals about work of the emergency control automatics system from Failure Preventing System of Boguchanskaya HPP;
  • collection of telecontrol information with “SVEY” digital transducers;
  • reception of telecontrol information from DCS1 GCARC (Group control of active & reactive capacity);
  • collection of telesignals with states of the all electrical devices from Boguchanskaya HPP;
  • transmission of telecontrol information received from GCARC, Failure Preventing System (about work of the emergency control automatics system), the ALFCS server, “SVEY” digital converters and telesignals about the state of all the electrical devices of Boguchanskaya HPP to a host system of the ALFCS of the Siberian Interregional Dispatching Office;
  • transmission of information needed to connect Boguchanskaya HPP to a host system of the ALFCS in DCS GCARC from Siberian Interregional Dispatching Office;
  • alarm issue to the APCS technological network of Boguchanskaya HPP;
  • primary information processing (scaling, filtration, etc...);
  • possibility to display of status information about the equipment state of the RTCCI of ALFCS, communication channels, receiving and transmitting information;
  • possibility to connect the service devices (telecoms engineer’s mobile automated workstation (AWS)).


1.1.2 The device is created by combining products of the “Tornado-TM” telecontrol equipment line (ТУ 4232-002-50756329-08).


Specifications:

1.3.1. The RTCCI of ALFCS is redundant, i.e. consists of two identical sets of the equipment.

1.3.2. The information capacity of one set of the devices is as follows:

  • 20 telesignalization channels of the states of controlled 220 V facilities (TS);
  • 8 RS-485 digital lines for polling the digital converters and for setting up the channels of communication with the ALFCS of the Siberian Interregional Dispatching Office;
  • 1 RS-232 channel for transmitting information in GCARC of HPP;
  • 1 digital Ethernet interface.

1.3.3. Power supply of the receive-transmit complex of control information of the automatic load-frequency control system is implemented using two feeders of 220 V DC2. The permissible power supply voltage deviations are as follows: from minus 30% to plus 15% of nominal value.

The duplicated secondary power sources are installed in the cabinets.

1.3.4. Electric strength and insulation resistance of galvanically isolated circuits

1.3.4.1. Insulation of galvanically isolated power circuits against the case of cabinet at the environment temperature (20 ± 5) °C and relative humidity from 45% to 80% should stand for 1 minute the AC test voltage of the sinusoidal form of 50 Hz frequency with the following voltage:

  • for low-voltage (up to 36 V) input TS circuits: 1500 V;
  • for low-voltage (up to 36 V) circuits of digital interfaces: 1000 V;
  • for circuits with DC and AC of 220 V (the power supply circuits): 1500 V.

1.3.4.2. The electrical resistance of the insulation between galvanically isolated circuits and between these circuits and the case of the cabinet must be at least 20 MΩ at the temperature (20 ± 5) °C and relative humidity from 45% to 80%. Resistance measuring points must be as follows:

  • between the output clamps of the secondary power source of low voltage devices (36 V) and a grounding element;
  • between the connection clamps of high-voltage signals (220 V) and a common point of low voltage circuits;
  • between the input circuits of primary power supply (220 V) in the cabinet;
  • between each of the ungrounded input circuits of primary power supply and a grounding element.

1.3.5. Tolerance to single failure is increased by redundancy of the hardware of the RTCCI of ALFCS.

1.3.6. The operation readiness of the device when the power is switched on: no more than 30 seconds.

1.3.7. The cabinet of the RTCCI of ALFCS is designed for continuous twenty-four-hour functioning without interference of staff and a user.

1.3.8. The reliability of the transmitted information is determined by given technical decisions, element base and telecontrol protocols and complies with Category No. 1 of GOST 26.205-88.


1 Distributed control system.

2 Direct current.



 

 


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