Pursuant to Article 116 of the Energy Law

INTER-
CONNECTION
 
OF
 
ALL
 
TYPES
 
OF
 
FACILITIES 
4.2.1.
 
T
ECHNICAL CRITERIA
 
4.2.1.1. The technical criteria from the section 3.2 of the Code must be met after connecting a 
facility of the transmission system user.
4.2.2.
 
C
ONNECTION
/
INTERCONNECTION SCHEME
 
4.2.2.1. JSC EMS act laying down connection and inter-connection, determines the scheme 
of connection and inter-connection. 
4.2.2.2. A facility can be connected or interconnected in several directions. For each of these 
directions, adequate switchgear, protection, measurement and control equipment shall be 
provided for the part which belongs to the transmission grid and the part which belongs to the 
facility of the transmission system user. 

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4.2.2.3. The scheme for connection/inter-connection of the facility is determined on the basis 
of all available data and proposals, in order to set standard switchyard. In this respect the 
following is taken into account: 
- Single-pole scheme of the facility and connector (in case of connection); 
- Operating characteristics of the facility and technological process; 
- Standard operating procedures and for this type of facility; 
- Possibility for delivery of power to the facility of the transmission system user 
from the distribution or other grids; 
- Consumption of the facility during normal operation or during any foreseeable 
changes. 
4.2.2.4. The scheme for connection/inter-connection must foresee: 
- Prospective development of the facility and transmission system; 
- Circuit breakers of appropriate technical characteristics that enable selective 
disconnection of transmission lines, transformers and busbar system in the 
facility of the transmission system user and neighbouring facilities; 
- Disconnectors (output and busbar for transmission lines, busbar for transformers 
and bus coupler bays); 
- Earthing elements (for the transmission line fields, 400 kV transformer fields, as 
well as for 400 kV busbars); 
- Measuring equipment; 
- Telecommunication equipment that can affect transmission capacity of elements 
of the grid 400 kV, 220 kV, 110 kV. 
4.2.2.5. Each connection between the facility of the transmission system user and 
transmission grid must be operated through a breaker that is able to break the maximum short 
circuit currents at the connection/inter-connection point. 
4.2.2.6. Coordination of insulation at all breakers, disconnectors, earthing elements, power 
transformers, voltage transformers, current transformers, surge arresters, insulators, 
equipment for grounding the neutral point, capacitors, silencers and coupling equipment, 
shall be in accordance with the IEC standards.