Summary Report for Conduct of Kozloduy NPP Stress Tests
Summary Report for Conduct of Kozloduy NPP Stress Tests
Summary Report for Conduct of Kozloduy NPP Stress Tests
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“<strong>Kozloduy</strong> <strong>NPP</strong>” PLC<br />
SUMMARY REPORT<br />
<strong>for</strong> <strong>Conduct</strong> <strong>of</strong> <strong>Kozloduy</strong> <strong>NPP</strong><br />
<strong>Stress</strong> <strong>Tests</strong><br />
1.6 GENERAL PLANT FACILITIES AND STRUCTURES<br />
1.6.1 Outdoor switchyard (OSY)<br />
The outdoor switchyard (OSY) <strong>of</strong> <strong>Kozloduy</strong> <strong>NPP</strong> has two main purposes, namely<br />
distribution <strong>of</strong> the electric power generated by the units and providing <strong>for</strong> <strong>NPP</strong> auxiliaries, including<br />
power supply to the bank pump stations.<br />
1.6.1.1 The site location and specific features<br />
The outdoor switchyard is located on <strong>Kozloduy</strong> <strong>NPP</strong> site. Its 110 KV part was commissioned<br />
be<strong>for</strong>e the construction and erection <strong>of</strong> Unit 1, and the whole construction <strong>of</strong> OSY has been<br />
implemented in three stages – <strong>for</strong> connection unit1 and 2, units 3 and 4 and units 5 and 6.<br />
1.6.1.2 Connections <strong>of</strong> the plant to the electric energy system (EES)<br />
<strong>Kozloduy</strong> <strong>NPP</strong> has been connected to the electric energy system (EES) <strong>of</strong> Bulgaria via three<br />
own switchyards (OSY) <strong>of</strong> voltage 400 kV, 220 kV and 110 kV, with the transmission lines<br />
outgoing from the plant as follows:<br />
· Eight transit transmission lines 400 kV, <strong>of</strong> which 2 are between the lines to the EES<br />
system in Romania and 6 lines to substations within the country;<br />
· five transmission lines 220 kV, from which 3 transit lines to substations in the<br />
country and 2 radial lines to bank pump station (BPS);<br />
· four transmission lines 110 kV, from which 2 transit lines to substations in the<br />
country and 2 radial lines to substations in the country.<br />
The total number <strong>of</strong> the transmission lines to which <strong>Kozloduy</strong> <strong>NPP</strong> is connected is 17,<br />
among which 13 are transit and 4 are radial.<br />
The connection between OSY 400 kV and OSY 220 kV also between OSY 220 kV and OSY<br />
110 kV are realize through autotrans<strong>for</strong>mers. Figure 1.6-1 presents a switchyard, showing all the<br />
conclusions and accessions.<br />
The following Figure 1.6-2 shows a detailed circuit diagram <strong>of</strong> the switchyard-400KV,<br />
related to power units 5 and 6. The diagram clearly shows the triple redundancy power stations own<br />
needs. It is also shown and the connection <strong>of</strong> mobile diesel generators.<br />
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